[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

CN114709872A - Automatic power generation control method, device and system for distributed photovoltaic power station - Google Patents

Automatic power generation control method, device and system for distributed photovoltaic power station Download PDF

Info

Publication number
CN114709872A
CN114709872A CN202210438861.2A CN202210438861A CN114709872A CN 114709872 A CN114709872 A CN 114709872A CN 202210438861 A CN202210438861 A CN 202210438861A CN 114709872 A CN114709872 A CN 114709872A
Authority
CN
China
Prior art keywords
power
power generation
station
automatic
controllable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210438861.2A
Other languages
Chinese (zh)
Inventor
关盈
马文栋
刘强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inspur Group Co Ltd
Original Assignee
Inspur Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inspur Group Co Ltd filed Critical Inspur Group Co Ltd
Priority to CN202210438861.2A priority Critical patent/CN114709872A/en
Publication of CN114709872A publication Critical patent/CN114709872A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application discloses an automatic power generation control method, device and system of a distributed photovoltaic power station, which are used for solving the technical problem that the existing power station grid-connected control mode cannot well meet the automatic power generation control requirement of a novel village photovoltaic power station. The method comprises the following steps: the automatic power generation control device determines the number of controllable inverters which are in communication connection with the automatic power generation control device, and determines the power generation power of each controllable inverter; receiving the total power generation power issued by the control main station, and determining schedulable power generation power through the power generation power of the controllable inverter; calculating the size relation between the schedulable generating power and the minimum dead zone capacity of the controllable inverter; under the condition that the schedulable generating power is larger than the minimum dead zone capacity, the schedulable generating power is evenly distributed to a controllable inverter which is in communication connection with an automatic generating control device so as to realize the automatic generating control of the photovoltaic power station; wherein the minimum dead band capacity of the controllable inverter is used to indicate that the controllable inverter is not dispatchable power generation.

Description

Automatic power generation control method, device and system for distributed photovoltaic power station
Technical Field
The application relates to the technical field of new energy power systems, in particular to an automatic power generation control method, device and system of a distributed photovoltaic power station.
Background
At present, the construction and grid-connection mode of the whole county distributed roof photovoltaic power station is different from the traditional distributed small-capacity individual power station and the large-capacity centralized power station, and the village area centralized boosting and grid-connection mode is mainly adopted, namely the output of the string type controllable inverters of the distributed photovoltaic power station in a unit village or an adjacent village is concentrated and collected, the 400V voltage output by the controllable inverters is boosted to 10kV through boosting and transformation, and the grid-connection mode is connected to a nearby 10kV line for grid-connection.
Under the mode, the concentrated grid-connected capacity of the village photovoltaic power station is about 2MW, and the concentrated grid-connected capacity is different from a small power station with 400V grid connection and is also different from a large centralized photovoltaic power station. The small-sized power stations with 400V grid connection are directly connected with the grid through the controllable inverters, partial small-sized photovoltaic power stations with 10kV grid connection are connected with the grid through the complete set of switches with the three-remote function and do not have the Automatic Generation Control (AGC) function, and the large-sized centralized photovoltaic power station has the AGC function, but the integrated Automatic system is too high in cost, needs special maintenance, is not high in economic applicability and is not suitable for rural area photovoltaic power stations. Different from the original photovoltaic power stations of different types, the grid-connected control modes of power stations such as complete comprehensive equipment, controllable inverter direct grid-connected equipment, 10KV primary and secondary complete equipment and the like cannot well meet the automation requirements of the novel village area photovoltaic power stations in the aspects of construction cost, functional integrity, automatic power generation control and the like.
Disclosure of Invention
The embodiment of the application provides an automatic power generation control method, device and system of a distributed photovoltaic power station, which are used for solving the following technical problems: the existing grid-connected control mode of the photovoltaic power station can not well meet the automatic power generation control requirement of the novel village area photovoltaic power station.
In a first aspect, an embodiment of the present application provides an automatic power generation control method for a distributed photovoltaic power station, including: the automatic power generation control device determines the number of controllable inverters which are in communication connection with the automatic power generation control device, and determines the power generation power of each controllable inverter; receiving the total power generation power issued by a control main station, and determining schedulable power generation power through the power generation power of the controllable inverter; calculating a magnitude relationship between the schedulable power generation power and a minimum dead band capacity of the controllable inverter; under the condition that the schedulable generating power is larger than the minimum dead zone capacity of the controllable inverter, the schedulable generating power is evenly distributed to the controllable inverter which is in communication connection with the automatic generating control device so as to realize the automatic generating control of the photovoltaic power station; wherein a minimum dead band capacity of the controllable inverter is used to indicate that the controllable inverter is not dispatchable power generation.
In one possible implementation manner of the embodiment of the present application, the determining schedulable power generation amount specifically includes: by the formula
Figure BDA0003614208530000021
Determining the schedulable generation power; wherein, PGeneral assemblyTotal power generation power, P, issued for the control master stationInverse directionThe number of the controllable inverters which are in communication connection with the automatic power generation control device is M.
In one possible implementation of the embodiment of the present application, after calculating the magnitude relationship between the schedulable power generation and the minimum dead band capacity of the controllable inverter, the method further comprises: determining that the schedulable generation power is less than or equal to a minimum dead band capacity of the controllable inverter; sending a shutdown command to the controllable inverter to shut down the controllable inverter.
In one possible implementation manner of the embodiment of the present application, after the automatic power generation control of the photovoltaic power plant is implemented, the method further includes: collecting grid-connected point voltage and grid-connected point current at a grid-connected switch to determine real-time power generation power of the photovoltaic power station; calculating a difference value between the real-time power generation power of the photovoltaic power station and the total power generation power issued by the control master station; and determining that the automatic power generation control process of the photovoltaic power station is finished under the condition that the difference value is smaller than the preset power generation deviation.
In a possible implementation manner of the embodiment of the present application, the method further includes: determining that the difference is greater than or equal to the preset power generation deviation; repeatedly executing the automatic power generation control process of the photovoltaic power station once, and calculating the latest difference value; and sending an alarm signal to the control main station to request operation and maintenance of the photovoltaic power station under the condition that the latest difference value is still larger than or equal to the preset power generation deviation.
In a possible implementation manner of the embodiment of the present application, the determining the number of the controllable inverters of the photovoltaic power station specifically includes: the automatic power generation control device collects power P when all grid-connected points of the photovoltaic power station are output in full scale by the controllable inverterFull of(ii) a Obtaining full power P of single controllable inverter by adopting a circulating shutdown modeMantle bill(ii) a By the formula
Figure BDA0003614208530000031
And calculating the number N of the controllable inverters of the photovoltaic power station.
In a possible implementation manner of the embodiment of the present application, the method further includes: determining whether the power generation condition of the photovoltaic power station is normal, specifically comprising: by the formula
Figure BDA0003614208530000032
Determining an estimated output P of a photovoltaic power plantInverse estimationRated output PContrary foreheadDeviation P betweenDifference (D)(ii) a Wherein N is the total number of the controllable inverters,
Figure BDA0003614208530000033
determining PDifference (D)And if the current is within the preset range, if the current exceeds the preset range, the operation and maintenance of the photovoltaic power station is alarmed.
In a second aspect, an embodiment of the present application further provides an automatic power generation control device for a distributed photovoltaic power station, where the device includes: a downlink communication module to determine a number of controllable inverters to establish a communication connection with the apparatus; the power generation estimation power module is used for determining the power generation power of each controllable inverter; the uplink communication module is used for receiving the total power generation power issued by the control master station; the automatic power generation strategy analysis control function module is used for determining schedulable power generation power through the power generation power of the controllable inverter; the automatic power generation strategy analysis and control function module is further used for calculating the size relation between the schedulable power generation power and the minimum dead zone capacity of the controllable inverter, and distributing the schedulable power generation power to the controllable inverter which is in communication connection with the automatic power generation control device on average under the condition that the schedulable power generation power is larger than the minimum dead zone capacity of the controllable inverter.
In a possible implementation manner of the embodiment of the present application, the apparatus further includes: the electrical quantity acquisition function module is used for acquiring grid-connected point voltage and grid-connected point current at a grid-connected switch so as to determine the real-time power generation power of the photovoltaic power station; the power station electric quantity alarm studying and judging functional module is used for calculating a difference value between the real-time power generation power of the photovoltaic power station and the total power generation power issued by the control master station; and the controller is further used for determining that the automatic power generation control process of the photovoltaic power station is completed under the condition that the difference value is smaller than the preset power generation deviation.
In a third aspect, an embodiment of the present application further provides an automatic power generation control system for a distributed photovoltaic power station, including an automatic power generation control device, a control master station, a village area photovoltaic array, a controllable inverter, and a grid-connected switch; the automatic power generation control device is in communication connection with the control master station through a VPN encryption channel so as to receive the total power generation power issued by the control master station; the automatic power generation control device is in communication connection with the controllable inverters through HPLC (high performance liquid chromatography) so as to determine the online quantity and the power generation power of the controllable inverters, and therefore the automatic power generation control of the photovoltaic power station is realized through the total power generation power; the controllable inverter is connected with the village area photovoltaic array, and the generated power of the photovoltaic power station is connected with the grid through the grid-connected switch.
The automatic power generation control method, device and system for the distributed photovoltaic power station have the following beneficial effects: the automatic power generation control device can estimate the power generation power of the photovoltaic power station, collect and calculate the actual power generation power of a grid connection point, establish a communication link between the control device and the controllable inverter and establish a communication link between the control device and the monitoring master station, and realize an automatic power generation control strategy and method of the distributed photovoltaic power station based on the functions. The embodiment of the application provides a novel photovoltaic power station automatic control device and method which are low in cost, complete in function and easy to deploy and install, solves the problem that an automatic power generation control method and equipment which meet market requirements do not exist in the existing village-region distributed photovoltaic power station, can meet the requirements of the village-region distributed photovoltaic power station on the economy of the automatic equipment, well meets the requirements of the village-region distributed photovoltaic power station on automatic power generation control of the power station, gives consideration to the running state monitoring of the photovoltaic power station, and has good innovation and economic benefits.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of an automatic power generation control method for a distributed photovoltaic power station according to an embodiment of the present application;
fig. 2 is a schematic diagram of an internal structure of an automatic power generation control device of a distributed photovoltaic power station according to an embodiment of the present application;
fig. 3 is a schematic diagram of an automatic power generation control system of a distributed photovoltaic power station according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The technical solutions proposed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart of an automatic power generation control method for a distributed photovoltaic power station according to an embodiment of the present application. As shown in fig. 1, the automatic power generation control method provided in the embodiment of the present application at least includes the following steps:
step 101, the automatic power generation control device determines the number of controllable inverters which are in communication connection with the automatic power generation control device, and determines the power generation power of each controllable inverter.
For the controllable inverters, the controllable inverters are considered not to be online in the embodiment of the application, that is, only the controllable inverters with good communication connection with the automatic power generation control device are considered to be the online controllable inverters in the embodiment of the application. In one example of the present application, the communication connection may be a communication connection established based on the HPIC protocol.
In one example of the present application, an automatic generation control device employs an adaptive algorithm to determine the number of controllable inverters of a photovoltaic power plant and the number of controllable inverters to which a communication connection is established. Determining the number of controllable inverters in a photovoltaic power station, specifically comprising: the automatic power generation control device collects the power P when the full-scale output of all controllable inverters of the grid-connected point of the photovoltaic power station is carried outFull ofThe full power P of the single controllable inverter is obtained by adopting a cycle stop mode (each controllable inverter is stopped circularly)Mantle billBy the formula
Figure BDA0003614208530000061
And calculating the number N of the controllable inverters of the photovoltaic power station.
Further, after the automatic power generation control device determines the controllable inverters and the number of the controllable inverters which establish communication connection with the automatic power generation control device, the power generation power of the controllable inverters is determined, and a specific determination process is described in detail below, which is not described herein again. Here, and hereinafter, the generated power of the controllable inverter refers to the daily generated power of the controllable inverter, that is, the daily generated power of the controllable inverter.
And 102, receiving the total power generation power issued by the control main station, and determining schedulable power generation power through the power generation power of the controllable inverter.
In addition to the communication connection with the controllable inverter, the automatic power generation control device also has a communication connection with the control master station to communicate with the control master station, and send a signal to the control master station or receive a command from the control master station.
Further, the control main station sends the total power generation power required to be output by the photovoltaic power station to the automatic power generation control device through the communication connection, and the automatic power generation control device calculates the schedulable power generation power based on the determined power generation power of the controllable inverter after receiving the total power generation power. The schedulable generated power here means the power generated by the on-line controllable inverter, because only the on-line controllable inverter can be adjusted and controlled by the automatic generation control device, and the generated power output by the off-line controllable inverter is fixed PInverse model. It should be further noted that, the process of calculating the schedulable power generation power is related to the number of the controllable inverters that are not on-line, and the detailed calculation process is referred to the related description below, which is not described herein again.
And 103, calculating the magnitude relation between the schedulable generating power and the minimum dead zone capacity of the controllable inverter.
The controllable inverter has a minimum dead zone capacity, which can be understood as the generated power of the controllable inverter that cannot be regulated, for example, the total power generation power of the controllable inverter is 10W, and the minimum dead zone capacity is 1W, then the controllable inverter has 1W of power that cannot be regulated, that is, the controllable inverter must output the generated power of 1W.
Further, the automatic generation control means, after determining the schedulable generated power, compare it with the minimum dead band capacity of the controllable inverters, where minimum dead band capacity refers to the sum of the minimum dead band capacities of all controllable inverters on line, since the schedulable generated power is also scheduled between all controllable inverters on line.
And 104, under the condition that the schedulable generating power is larger than the minimum dead zone capacity of the controllable inverter, averagely distributing the schedulable generating power to the controllable inverter which is in communication connection with the automatic generating control device.
In the embodiment of the application, if the schedulable power generation is larger than the minimum dead zone capacity of the controllable inverter, it is indicated that the power generation of the controllable inverter can be regulated, and at this time, the automatic power generation control device can averagely distribute the schedulable power generation to the online controllable inverters, so that the sum of the power generation output by all the online controllable inverters is the schedulable power generation, and the automatic power generation control of the photovoltaic power station is realized.
In one or more embodiments of the present application, assuming that the total number of controllable inverters is N, the generated power of each controllable inverter is PInverse directionThe number of controllable inverters (i.e., on-line) that successfully communicate with the automatic generation control device is M. The total power generation power delivered by the master station is controlled to be PGeneral assemblyThe power generation rate can be scheduled to be
Figure BDA0003614208530000071
(i is less than or equal to N-M), namely the generated power required to be provided by the online controllable inverter is PRegulating deviceIf P isRegulating device>PDead zone(the schedulable generating power is larger than the minimum dead zone capacity of the controllable inverters), the output of the controllable inverters is adjusted by adopting an average method, namely the output of each controllable inverter
Figure BDA0003614208530000072
If PRegulating device<PDead zoneIf the power is not enough, the automatic generation control device sends a shutdown command to the controllable inverter to shut down/stop M controllable invertersThe controllable inverter of the line reports that the control master station can realize the adjustment of the minimum output to
Figure BDA0003614208530000073
And simultaneously, a signal that the photovoltaic power station needs to be overhauled is sent to the control master station. In addition, the above PDead zoneRefers to the sum of all minimum dead band capacities of the online controllable inverters, not the minimum dead band capacity of one controllable inverter.
After the power of the controllable inverter is adjusted, the real-time power generation power P collected at a grid-connected point (grid-connected switch) is acquiredMiningThe total power generation power P issued by the monitoring main stationGeneral assemblyChecking if | PMining-PGeneral assembly|<And delta (delta is a preset power generation deviation, namely a power generation allowable deviation), the automatic power generation adjustment is successful. If PMining-PGeneral assembly|>And delta, continuing to execute the adjustment logic once to meet the power generation requirement of the control main station, and if the difference calculated again after the adjustment logic is executed once cannot be smaller than the preset power generation deviation, sending an alarm signal to the control main station to request operation and maintenance personnel to perform operation and maintenance processing on the photovoltaic power station.
In one or more embodiments of the present application, the generated power P of the controllable inverter is described aboveInverse directionThe determination process of (2) is as follows: suppose the sunlight intensity collected by the automatic power generation control device is B (W/m)2) The current temperature is T, the photoelectric conversion efficiency of the photovoltaic panel in the photovoltaic power station is alpha, the influence coefficient of the temperature on the power generation of the photovoltaic panel is k, the relative light transmittance of the photovoltaic panel is gamma, and the area of the single photovoltaic panel is S (m)2) And if the total number of the photovoltaic panels of the photovoltaic power station is N, estimating the power generation power of the controllable inverter of the power station:
Pinverse direction＝B*α*γ*N*S*T*k
Wherein α is the photoelectric conversion efficiency of the photovoltaic panel at different temperatures, and the value in the embodiment of the present application is 20%.
Further, the real-time power generation power P acquired by the grid-connected pointMiningThe determination process of (2) is as follows: three-phase voltage U of collected grid connection pointA、UB、UCAnd current IA、IB、ICObtaining the actual real-time output power P of the photovoltaic power stationMining＝∑Ui·Ij(i,j＝A,B,C)。
In one or more possible implementation manners of the embodiment of the present application, it may be further determined whether the power generation condition of the photovoltaic power station is normal according to the power generation power of the controllable inverter, specifically: by the formula
Figure BDA0003614208530000081
Determining an estimated output P of a photovoltaic power plantInverse estimationRated output PContrary foreheadDeviation P betweenDifference between(ii) a Wherein N is the total number of the controllable inverters,
Figure BDA0003614208530000082
and further determine PDifference (D)Whether it is within a reasonable range; if the operation and maintenance alarm range exceeds the reasonable range, the operation and maintenance alarm function of the power station is realized.
Based on the same inventive concept, the embodiment of the present application further provides an automatic power generation control device of a distributed photovoltaic power station and an automatic power generation control system of a distributed photovoltaic power station, and the structures of the automatic power generation control device and the automatic power generation control system of a distributed photovoltaic power station are respectively shown in fig. 2 and 3.
Fig. 2 is a schematic diagram of an internal structure of an automatic power generation control device of a distributed photovoltaic power station according to an embodiment of the present application. As shown in fig. 2, the apparatus includes:
a downlink communication module to determine a number of controllable inverters to establish a communication connection with the apparatus;
the power generation estimation power module is used for determining the power generation power of each controllable inverter;
the uplink communication module is used for receiving the total power generation power issued by the control master station;
the automatic power generation strategy analysis control function module is used for determining schedulable power generation power through the power generation power of the controllable inverter;
the automatic power generation strategy analysis and control function module is further used for calculating the size relation between the schedulable power generation power and the minimum dead zone capacity of the controllable inverter, and distributing the schedulable power generation power to the controllable inverter which is in communication connection with the automatic power generation control device on average under the condition that the schedulable power generation power is larger than the minimum dead zone capacity of the controllable inverter.
In one or more embodiments of the present application, the apparatus further comprises: and the electric quantity acquisition functional module (namely, the electric quantity acquisition functional module) is used for acquiring the voltage and the current of the grid-connected point at the grid-connected switch so as to determine the real-time power generation power of the photovoltaic power station.
In one or more embodiments of the present application, the apparatus further comprises: the power station electric quantity alarm studying and judging functional module is used for calculating a difference value between the real-time power generation power of the photovoltaic power station and the total power generation power issued by the control master station; and the automatic power generation control process of the photovoltaic power station is determined to be completed under the condition that the difference value is smaller than the preset power generation deviation.
In one or more embodiments of the present application, the automatic power generation control device is mainly used for collecting electric quantities such as voltage and current of a grid-connected point (a grid-connected switch in fig. 3), and calculating the output power of the grid-connected point in real time; the system is used for estimating the real-time power generation power of the power station by utilizing data collected by the illumination sensor and the temperature sensor and combining the capacity of the village area photovoltaic power station; the system is used for establishing a communication link between the controllable inverter and the control module through an HPLC communication conversion module, and sensing the daily generated energy, real-time output power, output voltage and current and other operation states of the controllable inverter and controlling the generated output; and the system is also used for comparing the estimated real-time power generation power of the power station with the output power of the grid-connected point acquired in real time, if the difference between the estimated real-time power generation power of the power station and the output power of the grid-connected point is within a normal deviation range, the power station is indicated to be normal in operation, if a large deviation occurs, a power station operation and maintenance alarm signal is sent out, the work of dust removal, maintenance and the like of the photovoltaic panel is carried out, and the two types of data are used as data bases for AGC control.
Further, in the automatic power generation control device, the downlink communication link control function module realizes that the device and the controllable inverter establish a communication link between the device and the controllable inverter through the HPLC communication conversion module, and senses the daily power generation amount, the real-time output power, the output voltage and current and other operation states of the controllable inverter and controls the power generation output. The uplink communication link control function module realizes the construction of a communication link between the device and the monitoring master station, adopts a VPN channel of a wireless public network, and adopts a miniature longitudinal encryption module as an encryption terminal for uploading data for ensuring the data security. The control master station sends a power generation control instruction of the power station through the link, the device decrypts and analyzes the instruction, and the automatic power generation strategy analysis control function module realizes the equal division control of power generation. The automatic power generation strategy analysis control function module of the distributed photovoltaic power station is a core control module, the power generation power is implemented by combining a grid-connected point according to the power generation amount scheduling requirement of a monitoring main station, the power generation efficiency and the online rate of the controllable inverter and the output power data of the controllable inverter are comprehensively researched and judged, the output power is distributed by adopting an equal division control method of effectively working the controllable inverter, and the automatic power generation control of the distributed photovoltaic power station is realized.
According to the automatic power generation control device in the embodiment of the application, the power generation efficiency and the online rate of the controllable inverter are comprehensively researched and judged by combining the real-time power generation power of the grid-connected point and the output power data of the controllable inverter according to the power generation amount scheduling requirement of the monitoring master station, the output power is distributed by adopting an equal division control method of effectively working the controllable inverter, and the automatic power generation control of the distributed photovoltaic power station is realized.
Fig. 3 is a schematic diagram of an automatic power generation control system of a distributed photovoltaic power station according to an embodiment of the present application. As shown in fig. 3, the system includes an automatic power generation control device, a control master station, a village photovoltaic array, a controllable inverter, and a grid-connected switch;
the automatic power generation control device is in communication connection with the control master station through a VPN encryption channel so as to receive the total power generation power issued by the control master station;
the automatic power generation control device is in communication connection with the controllable inverters through HPLC (high performance liquid chromatography) so as to determine the online quantity and the power generation power of the controllable inverters, and therefore automatic power generation control of the photovoltaic power station is achieved through the total power generation power;
the controllable inverter is connected with the village area photovoltaic array, and the generated power of the photovoltaic power station is connected with the grid through the grid-connected switch.
As shown in fig. 3, the automatic power generation control device is located at a 10kV grid-connected point of the photovoltaic power station, and establishes a downlink communication link with the controllable inverter through the HPLC module, and establishes an uplink communication link with the monitoring master station through the VPN encrypted channel. The device receives a power generation control command of the monitoring main station, and power generation control of the whole power station is realized through a control method.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus and system embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. An automatic power generation control method for a distributed photovoltaic power station, the method comprising:
the method comprises the steps that an automatic power generation control device determines the number of controllable inverters of a photovoltaic power station, determines the number of controllable inverters in communication connection with the automatic power generation control device, and determines the power generation power of each controllable inverter;
receiving the total power generation power issued by a control main station, and determining schedulable power generation power through the power generation power of the controllable inverter;
calculating a magnitude relationship between the schedulable power generation power and a minimum dead band capacity of the controllable inverter;
under the condition that the schedulable generating power is larger than the minimum dead zone capacity of the controllable inverter, the schedulable generating power is evenly distributed to the controllable inverter which is in communication connection with the automatic generating control device so as to realize the automatic generating control of the photovoltaic power station; wherein a minimum dead band capacity of the controllable inverter is used to indicate that the controllable inverter is not dispatchable power generation.
2. The automatic power generation control method of a distributed photovoltaic power plant as claimed in claim 1, wherein said determining schedulable power generation power specifically comprises:
by the formula
Figure FDA0003614208520000011
Determining the schedulable generation power;
wherein, PGeneral assemblyTotal power generation power P issued by the control master stationInverse directionThe power generation power of a single controllable inverter is obtained, N is the total number of the controllable inverters, and M is the number of the controllable inverters which are in communication connection with the automatic power generation control device.
3. The automatic power generation control method of a distributed photovoltaic power plant of claim 1 wherein after calculating the magnitude relationship between the schedulable power generation and the minimum dead band capacity of the controllable inverters, the method further comprises:
determining that the schedulable generation power is less than or equal to a minimum dead band capacity of the controllable inverter;
sending a shutdown command to the controllable inverter to shut down the controllable inverter.
4. The automatic power generation control method of a distributed photovoltaic power plant of claim 1, wherein after automatic power generation control of a photovoltaic power plant is achieved, the method further comprises:
collecting grid-connected point voltage and grid-connected point current at a grid-connected switch to determine real-time power generation power of the photovoltaic power station;
calculating a difference value between the real-time power generation power of the photovoltaic power station and the total power generation power issued by the control master station;
and determining that the automatic power generation control process of the photovoltaic power station is finished under the condition that the difference value is smaller than the preset power generation deviation.
5. The method of automatic power generation control of a distributed photovoltaic power plant of claim 4 further comprising:
determining that the difference is greater than or equal to the preset power generation deviation;
repeatedly executing the automatic power generation control process of the photovoltaic power station once, and calculating the latest difference value;
and sending an alarm signal to the control master station to request operation and maintenance of the photovoltaic power station under the condition that the latest difference value is still greater than or equal to the preset power generation deviation.
6. The automatic power generation control method of the distributed photovoltaic power plant according to claim 1, wherein the determining the number of the controllable inverters of the photovoltaic power plant specifically comprises:
the automatic power generation control device collects power P when all grid-connected points of the photovoltaic power station are output in full scale by the controllable inverterFull of；
Obtaining single said product by means of cyclic shutdownFull power P of control inverterMantle bill；
By the formula
Figure FDA0003614208520000021
And calculating the number N of the controllable inverters of the photovoltaic power station.
7. The method of claim 1 for automatic power generation control of a distributed photovoltaic power plant, further comprising:
determining whether the power generation condition of the photovoltaic power station is normal, specifically comprising:
by the formula
Figure FDA0003614208520000022
Determining an estimated output P of a photovoltaic power plantInverse estimationRated output PContrary foreheadDeviation P betweenDifference (D)(ii) a Wherein N is the total number of the controllable inverters,
Figure FDA0003614208520000023
determining PDifference (D)And if the current is within the preset range, if the current exceeds the preset range, the operation and maintenance of the photovoltaic power station is alarmed.
8. An automatic power generation control device of a distributed photovoltaic power station, characterized in that the device comprises:
a downlink communication module to determine a number of controllable inverters to establish a communication connection with the apparatus;
the power generation estimation power module is used for determining the power generation power of each controllable inverter;
the uplink communication module is used for receiving the total power generation power issued by the control master station;
the automatic power generation strategy analysis control function module is used for determining schedulable power generation power through the power generation power of the controllable inverter;
the automatic power generation strategy analysis and control function module is further used for calculating the size relation between the schedulable power generation power and the minimum dead zone capacity of the controllable inverter, and distributing the schedulable power generation power to the controllable inverter which is in communication connection with the automatic power generation control device on average under the condition that the schedulable power generation power is larger than the minimum dead zone capacity of the controllable inverter.
9. The automatic power generation control device of a distributed photovoltaic power plant of claim 8, characterized in that said device further comprises:
the electrical quantity acquisition function module is used for acquiring grid-connected point voltage and grid-connected point current at a grid-connected switch so as to determine the real-time power generation power of the photovoltaic power station;
the power station electric quantity alarm studying and judging functional module is used for calculating a difference value between the real-time power generation power of the photovoltaic power station and the total power generation power issued by the control master station;
the photovoltaic power station is also used for determining that the automatic power generation control process of the photovoltaic power station is finished under the condition that the difference value is smaller than the preset power generation deviation;
and the alarm device is used for sending an alarm signal to the control main station to request operation and maintenance of the photovoltaic power station under the condition that the difference value is greater than or equal to a preset power generation deviation.
10. An automatic power generation control system of a distributed photovoltaic power station is characterized by comprising an automatic power generation control device, a control master station, a village photovoltaic array, a controllable inverter and a grid-connected switch;
the automatic power generation control device is in communication connection with the control master station through a VPN encryption channel so as to receive the total power generation power issued by the control master station;
the automatic power generation control device is in communication connection with the controllable inverters through HPLC (high performance liquid chromatography) so as to determine the online quantity and the power generation power of the controllable inverters, and therefore automatic power generation control of the photovoltaic power station is achieved through the total power generation power;
the controllable inverter is connected with the village area photovoltaic array, and the generated power of the photovoltaic power station is connected with the grid through the grid-connected switch.
CN202210438861.2A 2022-04-25 2022-04-25 Automatic power generation control method, device and system for distributed photovoltaic power station Pending CN114709872A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210438861.2A CN114709872A (en) 2022-04-25 2022-04-25 Automatic power generation control method, device and system for distributed photovoltaic power station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210438861.2A CN114709872A (en) 2022-04-25 2022-04-25 Automatic power generation control method, device and system for distributed photovoltaic power station

Publications (1)

Publication Number Publication Date
CN114709872A true CN114709872A (en) 2022-07-05

Family

ID=82174646

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210438861.2A Pending CN114709872A (en) 2022-04-25 2022-04-25 Automatic power generation control method, device and system for distributed photovoltaic power station

Country Status (1)

Country Link
CN (1) CN114709872A (en)

Similar Documents

Publication Publication Date Title
CN102055241B (en) Integrated realtime power and solar-electricity station control system
AU2010285341B2 (en) Power regulating system for solar power station
US20210203165A1 (en) Device and Method for Intelligent control of power supply source connection
KR102261258B1 (en) Method and apparatus for bidirectional storage and renewable power converter
CN102591278B (en) Microgrid control system having power generation and load forecast functions and microgrid control method
WO2018113265A1 (en) Reactive power control method, device and system
CN105162172B (en) A kind of grid-connected photovoltaic power generation station power automatic control system
CN107017660B (en) The grid-connected protection system in photovoltaic power station region and grid-connected control method
CN105406515B (en) The independent micro-grid of grading control
CN113949075B (en) New energy network source coordinated frequency modulation and inertia support online monitoring and analyzing system and method
CN110855006B (en) Distributed optical storage and charging regulation and control system based on edge internet of things agent
CN111461919A (en) Wind-powered electricity generation field power control integration monitored control system
CN109659941B (en) AC/DC hybrid micro-grid autonomous control method and system
CN108695983B (en) Distributed photovoltaic power station energy management system and method
US20160105026A1 (en) Dynamic power distribution in photovoltaic installations
CN106340893B (en) A kind of distributed photovoltaic power generation Poewr control method based on virtual power plant
CN109004641A (en) A kind of microgrid source net lotus control method for coordinating based on energy source optimization scheduling
CN114709872A (en) Automatic power generation control method, device and system for distributed photovoltaic power station
EP3255749A1 (en) Advanced performance, optimization based control for photovoltaic power conversion
CN106100141B (en) Power station active power and reactive power automatic control system
CN116505591A (en) Coordination optimization scheduling method and device for virtual power plants participating in power distribution network
CN103475094A (en) Intelligent power generation controlling and optimizing system
CN118508432B (en) Energy interconnection method and system based on secondary fusion power distribution
CN220797878U (en) Intelligent edge control server with AGC (automatic gain control)
CN104079009B (en) A kind of grid-connected photovoltaic power supply direct current energy transfer control method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination