CN106972536A - A kind of control method and device of photovoltaic plant virtual synchronous generator - Google Patents
A kind of control method and device of photovoltaic plant virtual synchronous generator Download PDFInfo
- Publication number
- CN106972536A CN106972536A CN201710317472.3A CN201710317472A CN106972536A CN 106972536 A CN106972536 A CN 106972536A CN 201710317472 A CN201710317472 A CN 201710317472A CN 106972536 A CN106972536 A CN 106972536A
- Authority
- CN
- China
- Prior art keywords
- photovoltaic power
- synchronous generator
- virtual synchronous
- control
- generation unit
- 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.)
- Granted
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000010248 power generation Methods 0.000 claims abstract description 63
- 230000009467 reduction Effects 0.000 claims abstract description 15
- 239000013307 optical fiber Substances 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 25
- 238000004590 computer program Methods 0.000 description 7
- 238000013016 damping Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- H02J3/385—
-
- 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
- Supply And Distribution Of Alternating Current (AREA)
Abstract
本发明公开了一种光伏电站虚拟同步发电机的控制方法及装置，首先对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；再采集所述光伏电站并网点处的电压、电流和频率信号；利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元；所述各个光伏发电单元接收功率指令，跟踪功率参考值，实现对所述光伏电站的功率控制。上述方法实现了光伏电站的虚拟同步发电机功能，增强了光伏电站的安全稳定运行能力，同时能够发挥光伏电站的电压和频率控制能力。
The invention discloses a method and device for controlling a virtual synchronous generator in a photovoltaic power station. Firstly, load reduction control is performed on each photovoltaic power generation unit participating in the control of the virtual synchronous generator in the photovoltaic power station; and then the voltage at the grid-connected point of the photovoltaic power station is collected , current and frequency signals; use the virtual synchronous generator controller to realize the virtual synchronous generator control of the photovoltaic power station, and obtain the active and reactive power reference values of each photovoltaic power generation unit; transmit the power command obtained by the virtual synchronous generator controller through the optical fiber The network is issued to each photovoltaic power generation unit; each photovoltaic power generation unit receives a power command, tracks a power reference value, and realizes power control of the photovoltaic power station. The above method realizes the virtual synchronous generator function of the photovoltaic power station, enhances the safe and stable operation capability of the photovoltaic power station, and can simultaneously exert the voltage and frequency control capabilities of the photovoltaic power station.
Description
技术领域technical field
本发明涉及光伏发电系统技术领域，尤其涉及一种光伏电站虚拟同步发电机的控制方法及装置。The invention relates to the technical field of photovoltaic power generation systems, in particular to a control method and device for a virtual synchronous generator of a photovoltaic power station.
背景技术Background technique
随着新能源发电技术的不断发展，近些年来，基于电力电子逆变器接口的新能源发电(光伏发电、风力发电等)在电力系统中所占比重越来越高。世界主要国家均制定了各自的新能源发电发展计划。然而，与传统同步发电机电源相比基于电力电子逆变器接口的新能源发电系统响应速度快，将发电系统的响应与电力系统的动态响应解耦，几乎没有利于保持系统稳定运行的转动惯量和阻尼，其大量接入势必会影响到电力系统的动态特性，无法为电力系统提供必要的电压与频率支撑，为电力系统带来变革，为电力系统的稳定运行控制带来挑战。With the continuous development of new energy power generation technology, in recent years, the proportion of new energy power generation (photovoltaic power generation, wind power generation, etc.) based on power electronic inverter interface in the power system is getting higher and higher. Major countries in the world have formulated their own plans for the development of new energy power generation. However, compared with the traditional synchronous generator power supply, the new energy power generation system based on the power electronic inverter interface has a faster response speed, decouples the response of the power generation system from the dynamic response of the power system, and has almost no moment of inertia that is conducive to maintaining stable operation of the system And damping, a large number of its access will inevitably affect the dynamic characteristics of the power system, unable to provide the necessary voltage and frequency support for the power system, bring changes to the power system, and bring challenges to the stable operation and control of the power system.
针对逆变器并网的新能源发电系统，一般采用的控制策略为基于旋转坐标系的电流型控制，这种控制方法能够实现有功、无功功率的解耦控制，采用这种控制方法使新能源发电系统不具备旋转惯性和阻尼特性，不利于系统的稳定运行，采用虚拟同步发电机控制方法能够使基于逆变器并网的新能源发电系统具有类似于同步发电机的特性。但现有技术中的光伏并网系统不具备虚拟同步发电机的特性，如果对现有的光伏单元逆变器进行逐个改造比较费时、费力，而且由于各个光伏单元的逆变器独立运行，其相互之间的影响还需要进一步研究，才能保证整个光伏电站的运行性能。For new energy power generation systems with inverters connected to the grid, the control strategy generally adopted is current-based control based on the rotating coordinate system. This control method can realize decoupling control of active and reactive power. Using this control method makes the new The energy generation system does not have the characteristics of rotational inertia and damping, which is not conducive to the stable operation of the system. The virtual synchronous generator control method can make the new energy generation system based on the inverter grid-connected have characteristics similar to the synchronous generator. However, the photovoltaic grid-connected system in the prior art does not have the characteristics of a virtual synchronous generator. It would be time-consuming and laborious to transform the inverters of existing photovoltaic units one by one, and since the inverters of each photovoltaic unit operate independently, other The mutual influence needs to be further studied to ensure the operation performance of the entire photovoltaic power plant.
发明内容Contents of the invention
本发明的目的是提供一种光伏电站虚拟同步发电机的控制方法及装置，该方法实现了光伏电站的虚拟同步发电机功能，增强了光伏电站的安全稳定运行能力，同时能够发挥光伏电站的电压和频率控制能力。The purpose of the present invention is to provide a control method and device for a virtual synchronous generator of a photovoltaic power station, which realizes the function of a virtual synchronous generator of a photovoltaic power station, enhances the safe and stable operation of the photovoltaic power station, and can simultaneously exert the voltage of the photovoltaic power station and frequency control capabilities.
一种光伏电站虚拟同步发电机的控制方法，所述方法包括：A method for controlling a virtual synchronous generator in a photovoltaic power station, the method comprising:
步骤1、对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；Step 1. Perform load reduction control on each photovoltaic power generation unit participating in the control of the virtual synchronous generator in the photovoltaic power station;
步骤2、采集所述光伏电站并网点处的电压、电流和频率信号；Step 2, collecting voltage, current and frequency signals at the grid-connected point of the photovoltaic power station;
步骤3、利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；Step 3, using the virtual synchronous generator controller to realize the virtual synchronous generator control of the photovoltaic power station, and obtain the active and reactive power reference values of each photovoltaic power generation unit;
步骤4、将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元；Step 4. Send the power command obtained by the virtual synchronous generator controller to each photovoltaic power generation unit through the optical fiber network;
步骤5、所述各个光伏发电单元接收功率指令，跟踪功率参考值，实现对所述光伏电站的功率控制。Step 5. Each of the photovoltaic power generation units receives a power command, tracks a power reference value, and realizes power control of the photovoltaic power station.
在所述步骤1中，所述对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制的过程具体为：In the step 1, the process of carrying out load reduction control on each photovoltaic power generation unit participating in the control of the virtual synchronous generator in the photovoltaic power station is specifically as follows:
通过改变各个光伏发电单元的功率参考值，使光伏发电单元的有功功率输出偏离其最大功率跟踪值。By changing the power reference value of each photovoltaic power generation unit, the active power output of the photovoltaic power generation unit deviates from its maximum power tracking value.
在所述步骤2中，具体利用电流互感器和电压互感器来采集所述光伏电站并网点处的电压、电流和频率信号。In the step 2, current transformers and voltage transformers are specifically used to collect voltage, current and frequency signals at grid-connected points of the photovoltaic power plant.
在所述步骤3中，所述获得各个光伏发电单元的有功、无功功率参考值，具体包括：根据测量的电压、电流和频率信号通过虚拟同步发电机控制算法获得各个光伏单元的有功、无功功率参考值。In the step 3, the obtaining the active and reactive power reference values of each photovoltaic power generation unit specifically includes: obtaining the active and reactive power of each photovoltaic unit through a virtual synchronous generator control algorithm according to the measured voltage, current and frequency signals. Power reference value.
在所述步骤4中，所述功率指令为虚拟同步发电机控制的各个光伏发电单元的功率指令。In the step 4, the power command is the power command of each photovoltaic power generation unit controlled by the virtual synchronous generator.
一种光伏电站虚拟同步发电机的控制装置，所述装置包括：A control device for a virtual synchronous generator in a photovoltaic power station, the device comprising:
降载控制模块，用于对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；The load reduction control module is used to control the load reduction of each photovoltaic power generation unit participating in the control of the virtual synchronous generator in the photovoltaic power station;
测量模块，用于采集所述光伏电站并网点处的电压、电流和频率信号；A measurement module, configured to collect voltage, current and frequency signals at the grid-connected point of the photovoltaic power station;
虚拟同步发电机控制模块，用于利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；The virtual synchronous generator control module is used to realize the virtual synchronous generator control of the photovoltaic power station by using the virtual synchronous generator controller, and obtain the active and reactive power reference values of each photovoltaic power generation unit;
通讯模块，用于将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元。The communication module is used to send the power command obtained by the virtual synchronous generator controller to each photovoltaic power generation unit through the optical fiber network.
由上述本发明提供的技术方案可以看出，上述方法实现了光伏电站的虚拟同步发电机功能，增强了光伏电站的安全稳定运行能力，同时能够发挥光伏电站的电压和频率控制能力。It can be seen from the above-mentioned technical solution provided by the present invention that the above-mentioned method realizes the virtual synchronous generator function of the photovoltaic power station, enhances the safe and stable operation capability of the photovoltaic power station, and can exert the voltage and frequency control ability of the photovoltaic power station at the same time.
附图说明Description of drawings
为了更清楚地说明本发明实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域的普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他附图。In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative work.
图1为本发明实施例所提供光伏电站虚拟同步发电机的控制方法流程示意图；Fig. 1 is a schematic flowchart of a control method for a virtual synchronous generator in a photovoltaic power plant provided by an embodiment of the present invention;
图2为本发明所举实例中逆变器拓扑结构及其等效的虚拟同步发电机框图；Fig. 2 is the block diagram of the inverter topology and its equivalent virtual synchronous generator in the example given by the present invention;
图3为本发明实施例中虚拟同步发电机控制器的控制框图示意图；3 is a schematic diagram of a control block diagram of a virtual synchronous generator controller in an embodiment of the present invention;
图4为本发明实施例所举实例中的电力系统模型示意图；FIG. 4 is a schematic diagram of a power system model in an example of an embodiment of the present invention;
图5为本发明所举实例中光伏单元输出功率的示意图；Fig. 5 is the schematic diagram of the output power of the photovoltaic unit in the example given by the present invention;
图6为本发明所举实例中光伏电站输出功率示意图；Fig. 6 is a schematic diagram of output power of a photovoltaic power station in an example of the present invention;
图7为本发明所举实例中电力系统的频率对比示意图；Fig. 7 is the schematic diagram of the frequency comparison of the power system in the example given by the present invention;
图8为本发明实施例中光伏单元的频率控制功率输出示意图；Fig. 8 is a schematic diagram of frequency-controlled power output of a photovoltaic unit in an embodiment of the present invention;
图9为本发明实施例中光伏电站的频率控制功率输出示意图；Fig. 9 is a schematic diagram of frequency-controlled power output of a photovoltaic power station in an embodiment of the present invention;
图10为本发明实施例所提供的光伏电站虚拟同步发电机的控制装置示意图。Fig. 10 is a schematic diagram of a control device for a virtual synchronous generator of a photovoltaic power plant provided by an embodiment of the present invention.
具体实施方式detailed description
下面结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明的保护范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
本发明实施例提供了一种更为有效简洁的光伏电站虚拟同步发电机的控制方法，能够较为容易的建立光伏电站的虚拟同步发电机控制功能，提高光伏电站的稳定运行能力和对频率、电压的控制能力。下面将结合附图对本发明实施例作进一步地详细描述，如图1所示为本发明实施例所提供光伏电站虚拟同步发电机的控制方法流程示意图，所述方法包括：The embodiment of the present invention provides a more effective and concise control method for the virtual synchronous generator of the photovoltaic power station, which can easily establish the control function of the virtual synchronous generator of the photovoltaic power station, and improve the stable operation capability of the photovoltaic power station and the control of frequency and voltage. control ability. The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Figure 1 is a schematic flowchart of a control method for a virtual synchronous generator in a photovoltaic power plant provided by an embodiment of the present invention. The method includes:
步骤1、对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；Step 1. Perform load reduction control on each photovoltaic power generation unit participating in the control of the virtual synchronous generator in the photovoltaic power station;
在该步骤1中，对各个光伏发电单元进行降载控制的过程具体为：In this step 1, the process of performing load reduction control on each photovoltaic power generation unit is specifically as follows:
通过改变各个光伏发电单元的功率参考值，使光伏发电单元的有功功率输出偏离其最大功率跟踪值(根据当时的光照强度光伏单元能够发出的最大功率)，从而为光伏发电单元参与虚拟同步发电机控制留出备用容量。By changing the power reference value of each photovoltaic power generation unit, the active power output of the photovoltaic power generation unit deviates from its maximum power tracking value (the maximum power that the photovoltaic unit can emit according to the light intensity at that time), so as to participate in the virtual synchronous generator for the photovoltaic power generation unit Controls set aside spare capacity.
步骤2、采集所述光伏电站并网点处的电压、电流和频率信号；Step 2, collecting voltage, current and frequency signals at the grid-connected point of the photovoltaic power station;
该步骤中，具体是利用电流互感器和电压互感器来采集所述光伏电站并网点处的电压、电流和频率信号。In this step, current transformers and voltage transformers are specifically used to collect voltage, current and frequency signals at grid-connected points of the photovoltaic power plant.
步骤3、利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；Step 3, using the virtual synchronous generator controller to realize the virtual synchronous generator control of the photovoltaic power station, and obtain the active and reactive power reference values of each photovoltaic power generation unit;
该步骤中，所述获得各个光伏发电单元的有功、无功功率参考值的过程具体包括：根据测量的电压、电流和频率信号通过虚拟同步发电机控制算法获得各个光伏单元的有功、无功功率参考值。In this step, the process of obtaining the active and reactive power reference values of each photovoltaic power generation unit specifically includes: obtaining the active and reactive power of each photovoltaic unit through a virtual synchronous generator control algorithm according to the measured voltage, current and frequency signals Reference.
下面以具体的实例对上述虚拟同步发电机控制原理进行详细说明：The following is a detailed description of the above virtual synchronous generator control principle with specific examples:
如图2所示为本发明所举实例中逆变器拓扑结构及其等效的虚拟同步发电机框图，同步发电机的机械方程为As shown in Figure 2, it is the inverter topology structure and its equivalent virtual synchronous generator block diagram in the example given by the present invention, and the mechanical equation of the synchronous generator is
式中，J为同步发电机的转动惯量，单位为kg·m2Tm、Te和Td分别为同步发电机的机械、电磁和阻尼转矩，单位为N·m，D为阻尼系数，单位为N·m·s/rad，ω0为电网同步角速度，单位为rad/s。其中发电机的电磁转矩Te由虚拟同步发电机电势eabc和输出电流iabc计算得到，如式(2)所示：In the formula, J is the moment of inertia of the synchronous generator, the unit is kg m 2 T m , Te and T d are the mechanical, electromagnetic and damping torque of the synchronous generator, respectively, the unit is N m, and D is the damping coefficient , the unit is N·m·s/rad, ω 0 is the grid synchronous angular velocity, the unit is rad/s. The electromagnetic torque Te of the generator is calculated from the potential e abc of the virtual synchronous generator and the output current i abc , as shown in formula (2):
Te＝Pe/ω＝(eaia+ebib+ecic)/ω (2)T e =P e /ω=(e a i a +e b i b +e c i c )/ω (2)
式中，Pe为虚拟同步发电机输出的电磁功率。In the formula, P e is the electromagnetic power output by the virtual synchronous generator.
逆变器的虚拟同步发电机控制在其有功功率环中引入式(1)的控制，通过控制的手段实现了同步发电机的机械特性。由于引入了转动惯量J，使得并网逆变器在有功功率和频率动态过程中具有了惯性，引入阻尼参数D，使得逆变器具有了阻尼电网功率振荡的能力，这两个变量的引入是逆变器具有了同步发电机的性能，对于改善逆变器运行特性具有重要意义。The virtual synchronous generator control of the inverter introduces the control of formula (1) into its active power loop, and realizes the mechanical characteristics of the synchronous generator through the means of control. Due to the introduction of the moment of inertia J, the grid-connected inverter has inertia in the dynamic process of active power and frequency, and the introduction of the damping parameter D makes the inverter have the ability to damp the grid power oscillation. The introduction of these two variables is The inverter has the performance of a synchronous generator, which is of great significance for improving the operating characteristics of the inverter.
由图2同时可以得到虚拟同步发电机的电磁方程为：From Figure 2, the electromagnetic equation of the virtual synchronous generator can be obtained as follows:
式中，L为同步发电机的同步电抗，R为同步发电机的同步电阻，uabc为同步发电机机端电压，iabc为同步发电机机端电流，eabc表示同步发电机电势。In the formula, L is the synchronous reactance of the synchronous generator, R is the synchronous resistance of the synchronous generator, u abc is the terminal voltage of the synchronous generator, i abc is the terminal current of the synchronous generator, and e abc is the potential of the synchronous generator.
由虚拟同步发电机的电磁方程能够得到虚拟同步发电机的机端电流，从而由机端电流和电压计算得到功率指令，该功率指令为虚拟同步发电机控制的各个光伏发电单元的总功率指令。The machine terminal current of the virtual synchronous generator can be obtained from the electromagnetic equation of the virtual synchronous generator, so that the power command can be calculated from the machine terminal current and voltage, and the power command is the total power command of each photovoltaic power generation unit controlled by the virtual synchronous generator.
进一步的，在虚拟同步发电机控制中可以同时实现频率控制和电压控制，如图3所示为本发明实施例中虚拟同步发电机控制器的控制框图示意图，频率控制通过测量并网点的频率，将其与系统额定频率的偏差用于调节总有功功率：Further, in the virtual synchronous generator control, frequency control and voltage control can be realized at the same time, as shown in Figure 3 is a schematic diagram of the control block diagram of the virtual synchronous generator controller in the embodiment of the present invention, the frequency control is by measuring the frequency of the grid-connected point, Use its deviation from the system nominal frequency to regulate the total active power:
ΔP＝Kf(fref-fmeas) (3)ΔP=K f (f ref -f meas ) (3)
式中，Kf为调频系数，fref为系统额定频率，fmeas为测量的并网点频率。In the formula, K f is the frequency modulation coefficient, f ref is the rated frequency of the system, and f meas is the measured grid connection point frequency.
电压控制位于无功功率控制环，将电压偏差用于调节虚拟同步机的电势The voltage control is located in the reactive power control loop, and the voltage deviation is used to regulate the potential of the virtual synchronous machine
ΔE＝Kv(Vref-Vmeas) (4)ΔE=K v (V ref -V meas ) (4)
由虚拟同步发电机控制器得到有功、无功功率参考值，然后再由功率分配单元将该功率指令按照各个光伏发电单元的额定容量按比例分配下发给各个光伏发电单元，如式(5)所示The active and reactive power reference values are obtained by the virtual synchronous generator controller, and then the power distribution unit distributes the power command to each photovoltaic power generation unit in proportion to the rated capacity of each photovoltaic power generation unit, as shown in formula (5) shown
式中，Prefi为第i个光伏单元的有功功率指令，Si为第i个光伏单元的额定容量，N为虚拟同步发电机控制的总的光伏发电单元数，PTotal为由虚拟同步发电机控制得到的总功率参考值，对于无功功率的分配方法与有功功率相同。In the formula, P refi is the active power command of the i-th photovoltaic unit, S i is the rated capacity of the i-th photovoltaic unit, N is the total number of photovoltaic power generation units controlled by the virtual synchronous generator, and P Total is the total number of photovoltaic power generation units controlled by the virtual synchronous generator. The total power reference value obtained by machine control, the distribution method of reactive power is the same as that of active power.
步骤4、将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元；Step 4. Send the power command obtained by the virtual synchronous generator controller to each photovoltaic power generation unit through the optical fiber network;
由于虚拟同步发电机控制器与各个光伏发电单元分布于不同的地理位置，为了保证信号传输的速度，可以采用光纤网络将功率指令下发到各个光伏发电单元。Since the virtual synchronous generator controller and each photovoltaic power generation unit are distributed in different geographic locations, in order to ensure the speed of signal transmission, an optical fiber network can be used to send power commands to each photovoltaic power generation unit.
所述功率指令为虚拟同步发电机控制的各个光伏发电单元的功率指令。The power command is the power command of each photovoltaic power generation unit controlled by the virtual synchronous generator.
步骤5、所述各个光伏发电单元接收功率指令，跟踪功率参考值，实现对所述光伏电站的功率控制。Step 5. Each of the photovoltaic power generation units receives a power command, tracks a power reference value, and realizes power control of the photovoltaic power station.
这里，一般光伏发电单元能够接受外部的功率指令，故实现起来比较容易，本发明实施例不涉及到对光伏发电单元内部控制系统的改造。Here, a general photovoltaic power generation unit can accept external power commands, so it is relatively easy to implement, and the embodiment of the present invention does not involve the transformation of the internal control system of the photovoltaic power generation unit.
下面结合一个具体实施例对本发明的控制进行详细说明，采用Matlab/Simulink搭建如图4所示的电力系统模型对所述控制方法进行仿真验证，该电力系统包含一台同步发电机G1和一个光伏电站，光伏电站采用2个光伏逆变单元表示，容量均为30kW，同步发电机G1额定容量为300kW。The control of the present invention is described in detail below in conjunction with a specific embodiment, adopts Matlab/Simulink to build the power system model as shown in Figure 4 and carry out simulation verification to described control method, this power system comprises a synchronous generator G1 and a photovoltaic The power station and the photovoltaic power station are represented by two photovoltaic inverter units, both of which have a capacity of 30kW, and the rated capacity of the synchronous generator G1 is 300kW.
根据光照条件光伏电站最大输出功率为50kW，为了对光伏电站进行虚拟同步发电机控制，将其进行降载控制留有20％的备用容量(通过直接给光伏发电单元下降载功率指令实现)，控制其总输出功率为40kW，光伏发电单元1和2的输出功率相同分别为约20kW，同步发电机输出功率150kW，负载190kW。光伏电站的虚拟同步发电机控制参数为J＝4,D＝20,由于光伏单元1和光伏单元2容量相同，采用平均分配虚拟同步发电机的功率指令。为了验证光伏电站的虚拟同步发电机控制效果，在2s时给虚拟同步发电机控制器一个阶跃信号，控制其输出功率由40kW阶跃到45kW，如图5所示为本发明所举实例中光伏单元输出功率的示意图，如图6所示为本发明所举实例中光伏电站输出功率示意图。According to the light conditions, the maximum output power of the photovoltaic power station is 50kW. In order to control the virtual synchronous generator of the photovoltaic power station, the load reduction control is performed to leave 20% of the reserve capacity (realized by directly giving the photovoltaic power generation unit a power reduction command). Its total output power is 40kW, the output power of photovoltaic power generation unit 1 and 2 is about 20kW respectively, the output power of synchronous generator is 150kW, and the load is 190kW. The control parameters of the virtual synchronous generator of the photovoltaic power station are J=4, D=20. Since the photovoltaic unit 1 and photovoltaic unit 2 have the same capacity, the power command of the virtual synchronous generator is evenly distributed. In order to verify the virtual synchronous generator control effect of the photovoltaic power station, a step signal is given to the virtual synchronous generator controller at 2s to control its output power from 40kW to 45kW, as shown in Figure 5 for the example of the present invention A schematic diagram of the output power of the photovoltaic unit, as shown in FIG. 6 , is a schematic diagram of the output power of the photovoltaic power station in the example of the present invention.
仿真结果表明，通过虚拟同步发电机控制，光伏电站的输出功率具有了与同步发电机类似的惯性和阻尼特性。进一步，验证光伏电站虚拟同步发电机控制对系统频率控制的效果，频率控制器参数Kf取1000。在5s时增加负载20kW，引起系统频率下降。如图7所示为本发明所举实例中电力系统的频率对比示意图，当采用虚拟同步发电机控制和不采用虚拟同步发电机控制时(光伏发电单元不响应系统频率变化)得到的系统频率如图7中所示。The simulation results show that the output power of the photovoltaic power plant has similar inertia and damping characteristics to the synchronous generator through virtual synchronous generator control. Further, to verify the effect of the virtual synchronous generator control of the photovoltaic power station on the system frequency control, the frequency controller parameter K f is set to 1000. Increase the load by 20kW in 5s, causing the system frequency to drop. As shown in Figure 7, it is a schematic diagram of the frequency comparison of the power system in the example of the present invention. When using the virtual synchronous generator control and not using the virtual synchronous generator control (the photovoltaic power generation unit does not respond to system frequency changes), the system frequency obtained is as follows: shown in Figure 7.
进一步的，如图8所示为本发明实施例中光伏单元的频率控制功率输出示意图，如图9所示为本发明实施例中光伏电站的频率控制功率输出示意图，由仿真结果表明：采用虚拟同步发电机控制的光伏电站能够增加有功功率的输出参与系统频率控制，有利于系统的安全稳定运行。Further, Fig. 8 is a schematic diagram of the frequency-controlled power output of the photovoltaic unit in the embodiment of the present invention, and Fig. 9 is a schematic diagram of the frequency-controlled power output of the photovoltaic power station in the embodiment of the present invention. The simulation results show that: using virtual The photovoltaic power station controlled by the synchronous generator can increase the output of active power to participate in the system frequency control, which is conducive to the safe and stable operation of the system.
由上述实施例可知，本发明实施例提供的光伏电站虚拟同步发电机控制方法使光伏电站具有了虚拟同步发电机的功能，能够为系统提供惯性和阻尼，有效应对系统频率变化，提高了保障系统安全稳定运行的能力。It can be seen from the above embodiments that the photovoltaic power station virtual synchronous generator control method provided by the embodiment of the present invention enables the photovoltaic power station to have the function of a virtual synchronous generator, which can provide inertia and damping for the system, effectively respond to system frequency changes, and improve the security system. Ability to operate safely and stably.
针对上述方法流程，本发明实施例还提供一种光伏电站虚拟同步发电机的控制装置，该装置的具体内容可以参照上述方法实施，如图10所示为本发明实施例所提供的光伏电站虚拟同步发电机的控制装置示意图，所述装置主要包括：In view of the above-mentioned method flow, the embodiment of the present invention also provides a control device for a virtual synchronous generator of a photovoltaic power station. Schematic diagram of the control device of the synchronous generator, the device mainly includes:
降载控制模块101，用于对光伏电站内参与虚拟同步发电机控制的各个光伏发电单元进行降载控制；The load reduction control module 101 is used to perform load reduction control on each photovoltaic power generation unit participating in the control of the virtual synchronous generator in the photovoltaic power station;
测量模块102，用于采集所述光伏电站并网点处的电压、电流和频率信号；A measurement module 102, configured to collect voltage, current and frequency signals at grid-connected points of the photovoltaic power plant;
虚拟同步发电机控制模块103，用于利用虚拟同步发电机控制器实现光伏电站的虚拟同步发电机控制，获得各个光伏发电单元的有功、无功功率参考值；The virtual synchronous generator control module 103 is used to realize the virtual synchronous generator control of the photovoltaic power station by using the virtual synchronous generator controller, and obtain active and reactive power reference values of each photovoltaic power generation unit;
通讯模块104，用于将虚拟同步发电机控制器得到的功率指令通过光纤网络下发到各个光伏发电单元。The communication module 104 is used to send the power command obtained by the virtual synchronous generator controller to each photovoltaic power generation unit through the optical fiber network.
另外，在光伏发电单元内部设置有功率控制模块，该功率控制模块用于接收功率指令，跟踪功率参考值，实现对所述光伏电站的功率控制。In addition, a power control module is arranged inside the photovoltaic power generation unit, and the power control module is used for receiving power commands, tracking power reference values, and realizing power control of the photovoltaic power station.
上述各功能模块的具体实现过程可参考方法实施例所述。For the specific implementation process of the above functional modules, reference may be made to the method embodiments.
本领域内的技术人员应明白，本发明的实施例可提供为方法、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。Those skilled in the art should understand that the embodiments of the present invention may be provided as methods or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明披露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求书的保护范围为准。The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field can easily conceive of changes or changes within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710317472.3A CN106972536B (en) | 2017-05-08 | 2017-05-08 | Control method and device for virtual synchronous generator of photovoltaic power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710317472.3A CN106972536B (en) | 2017-05-08 | 2017-05-08 | Control method and device for virtual synchronous generator of photovoltaic power station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106972536A true CN106972536A (en) | 2017-07-21 |
| CN106972536B CN106972536B (en) | 2020-09-29 |
Family
ID=59330497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710317472.3A Expired - Fee Related CN106972536B (en) | 2017-05-08 | 2017-05-08 | Control method and device for virtual synchronous generator of photovoltaic power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106972536B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108695897A (en) * | 2018-06-27 | 2018-10-23 | 北京金风科创风电设备有限公司 | Power control method, device, controller, system and medium of photovoltaic power station |
| CN109409012A (en) * | 2018-11-30 | 2019-03-01 | 国网青海省电力公司 | Machine net couples the virtual inverter multi-machine parallel connection Detection of Stability method of photovoltaic under background |
| CN109586343A (en) * | 2018-12-29 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | Photovoltaic-energy-storing and power-generating system and method based on virtual synchronous generator control |
| CN110071524A (en) * | 2019-04-01 | 2019-07-30 | 合肥工业大学 | Single-phase cascaded H-bridges photovoltaic DC-to-AC converter virtual synchronous control method |
| CN110098632A (en) * | 2018-01-29 | 2019-08-06 | 中国电力科学研究院有限公司 | A kind of virtual synchronous Generator Damping quantifies recognition methods, system and device |
| CN116018740A (en) * | 2020-08-05 | 2023-04-25 | 三菱电机株式会社 | Distributed power management device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103972928A (en) * | 2014-04-18 | 2014-08-06 | 国家电网公司 | Microgrid and microsource control method based on virtual synchronous electric generator |
| EP2963759A1 (en) * | 2013-02-28 | 2016-01-06 | Kawasaki Jukogyo Kabushiki Kaisha | Power conversion device for connection to grid |
| CN106571646A (en) * | 2016-09-30 | 2017-04-19 | 深圳市禾望电气股份有限公司 | Dynamic active power frequency modulation method and apparatus of photovoltaic power generation system |
-
2017
- 2017-05-08 CN CN201710317472.3A patent/CN106972536B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2963759A1 (en) * | 2013-02-28 | 2016-01-06 | Kawasaki Jukogyo Kabushiki Kaisha | Power conversion device for connection to grid |
| CN103972928A (en) * | 2014-04-18 | 2014-08-06 | 国家电网公司 | Microgrid and microsource control method based on virtual synchronous electric generator |
| CN106571646A (en) * | 2016-09-30 | 2017-04-19 | 深圳市禾望电气股份有限公司 | Dynamic active power frequency modulation method and apparatus of photovoltaic power generation system |
Non-Patent Citations (1)
| Title |
|---|
| 张辉等: "离网运行的多微源微网调频调压控制策略", 《高电压技术》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098632A (en) * | 2018-01-29 | 2019-08-06 | 中国电力科学研究院有限公司 | A kind of virtual synchronous Generator Damping quantifies recognition methods, system and device |
| CN108695897A (en) * | 2018-06-27 | 2018-10-23 | 北京金风科创风电设备有限公司 | Power control method, device, controller, system and medium of photovoltaic power station |
| CN109409012A (en) * | 2018-11-30 | 2019-03-01 | 国网青海省电力公司 | Machine net couples the virtual inverter multi-machine parallel connection Detection of Stability method of photovoltaic under background |
| CN109409012B (en) * | 2018-11-30 | 2023-02-28 | 国网青海省电力公司 | Stability detection method for multi-machine parallel connection of photovoltaic virtual inverter under the background of machine-network coupling |
| CN109586343A (en) * | 2018-12-29 | 2019-04-05 | 国网天津市电力公司电力科学研究院 | Photovoltaic-energy-storing and power-generating system and method based on virtual synchronous generator control |
| CN110071524A (en) * | 2019-04-01 | 2019-07-30 | 合肥工业大学 | Single-phase cascaded H-bridges photovoltaic DC-to-AC converter virtual synchronous control method |
| CN110071524B (en) * | 2019-04-01 | 2020-09-01 | 合肥工业大学 | Virtual synchronization control method for single-phase cascaded H-bridge photovoltaic inverters |
| CN116018740A (en) * | 2020-08-05 | 2023-04-25 | 三菱电机株式会社 | Distributed power management device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106972536B (en) | 2020-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106972536B (en) | Control method and device for virtual synchronous generator of photovoltaic power station | |
| CN106356884B (en) | A photovoltaic grid-connected control method, device and system based on a virtual synchronous machine | |
| CN106054672A (en) | Real micro-grid operation dynamic simulation test platform based on RT-LAB | |
| CN105162167A (en) | Adaptive-droop-control-based wind-photovoltaic-energy-storage micro-grid frequency modulation method | |
| CN106849141B (en) | A kind of large capacity centralization virtual synchronous machine control method, apparatus and system | |
| CN108736519A (en) | A kind of the virtual synchronous generator self-adaptation control method and device of photovoltaic plant | |
| CN104158209B (en) | It is adapted to the double-fed blower fan sagging voltage-source type control method of microgrid multi-mode operation | |
| CN116094035A (en) | New energy unit inertia simulation control method based on super capacitor energy storage | |
| CN105305430B (en) | Power Quality Improvement Method of Photovoltaic Storage Power Generation System Based on Hierarchical Control | |
| CN109327031A (en) | Power coordinated control method and system for direct-drive wind power multi-machine system based on battery energy storage | |
| CN103986189A (en) | A Simplified Modeling Method for Energy Storage Doubly-fed Wind Farm | |
| CN103023056A (en) | Micro-grid control method and micro-grid control device | |
| CN110581568A (en) | An energy storage capacity configuration method, system and device for improving grid inertia | |
| CN113964879A (en) | A new energy grid-connected inverter self-synchronizing voltage source control method | |
| CN110445186B (en) | Self-synchronizing microgrid control system and secondary frequency modulation control method | |
| CN108365620A (en) | A kind of method and device that energy-storage system is emulated based on Equivalent Model | |
| CN117728461A (en) | An energy storage power system dispatching optimization method, device and electronic equipment | |
| CN112600255B (en) | Energy-storage-free photovoltaic voltage type control method, storage medium and computing device | |
| CN115693745A (en) | Flexible low-frequency power transmission system control method and device | |
| CN114899819A (en) | New energy power station energy storage system transient overvoltage control method and device | |
| CN110854913B (en) | Simulation method of doubly-fed induction wind power generation system | |
| CN115360776A (en) | A control method and system for medium/low voltage AC/DC hybrid distribution network | |
| CN207817164U (en) | A kind of photovoltaic virtual synchronous generator performance test device | |
| Wang et al. | Entropy weight and grey relational analysis based virtual capacitance collaborative control for multiple energy storage units | |
| CN115940164B (en) | Bidirectional virtual inertia control method, device and medium for power distribution system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200929 Termination date: 20210508 |