KR101299960B1 - Grid connected solar generation system - Google Patents

Abstract

PURPOSE: A grid connected photovoltaic system is provided to have a data acquisition (DAQ) unit programmed in advance to be automatically recognized by being compatible with different data and communication types of multiple inverters, thereby easily collecting data of the inverters. CONSTITUTION: A grid connected photovoltaic system includes multiple solar cell modules (100) converting solar energy into electric energy; multiple power conditioners (200) including inverters (210), respectively; a DAQ unit (300) including a first DAQ unit detecting the generation amount of the solar cell module at a constant cycle and a second DAQ unit detecting the abnormality of the inverter at a constant cycle; a control unit (400) integrally controlling the solar cell module and the power conditioner and transmitting a control signal to a switching unit (500); the switching unit selectively switching the power generated from a commercial electricity (50) or the solar cell modules; and a monitoring unit (600). [Reference numerals] (300) DAQ unit (Data Acquisition unit); (400) Control unit (MICOM); (50) Commercial electricity; (500) Switching unit; (AA) Power failure detection; (BB,CC,210) Inverter; (DD) Wired and wireless network; (EE) Field : portable terminal/PC; (FF) Remote place : portable terminal/PC; (GG,HH,II) Load

Description

Grid connected solar generation system {Grid connected solar generation system}

The present invention relates to a grid-tied photovoltaic power generation system, and more particularly, a data acquisition unit (DAQ unit) that is pre-programmed so that different data and communication types are compatible with each manufacturer of an inverter is automatically provided. A grid-connected photovoltaic system that facilitates data collection and integrated control.

In recent years, energy safety crisis has emerged as new factors intensifying the energy crisis, such as soaring international oil prices, climate change and global warming, have emerged at the global, regional and national levels.

In particular, the energy crisis and imbalance in supply and demand are accelerating due to factors such as a low-energy industrial structure and alternative energy sources, which import 97% of energy in Korea. In spite of these crises, Korea's energy demand has been steadily increasing due to industrial development and large-scale domestic appliances. In order to secure electricity supply reserve ratio after 1990, it is burdening annual capacity expansion.

Photovoltaic Power Generation System, which can alleviate some of the burden of global warming and power plant expansion, uses solar panels with multiple solar cells to produce electricity by converting sunlight into direct current electricity. . Photovoltaic power generation system is a decentralized power generation system that can be used semi-permanently, easy to maintain using solar cells, and is being spotlighted as an alternative energy source of the future due to the use of pollution-free and inexhaustible solar energy sources. It can also be a boon to your household.

On the other hand, the above-mentioned photovoltaic power generation system has been proposed a grid-connected photovoltaic power generation system that combines the electricity generated from the photovoltaic module with the commercial power supplied to KEPCO and commercial power. When photovoltaic generation is difficult, commercial power is supplied.

For example, Korean Patent Publication No. 10-1208725 (Nov. 29, 2012) includes a solar module; A storage battery storing electricity generated in the solar module; An inverter for converting electricity of the battery into an AC voltage; A switching module for selectively switching the power supplied from the inverter to commercial power and a solar module; First and second phase detectors connected to the commercial power source and the output side of the inverter, respectively, for detecting a phase of the power source; A controller for comparing phase signals of power input from the first and second phase detectors to synchronize the signals output from the inverter; In addition, by connecting the photovoltaic module, the storage battery, the switching module, and the controller, the charging / discharging state of the storage battery is sensed and the switching module is controlled according to the charging amount to selectively supply the power of the commercial power supply and the photovoltaic power generation system to the load side. There has been proposed a photovoltaic power generation system including a system control unit which can be supplied (see FIG. 1).

However, although the proposed technique is generally applicable to a small household 3KW solar power generation system consisting of one solar module and an inverter, a plurality of solar modules are installed in clusters and a plurality of inverters connected to each other are provided. Large scale photovoltaic systems installed in required power plants or industrial complexes have problems in installation and maintenance.

In other words, in order to control the various types of inverters that correspond to the specifications of a plurality of solar modules installed in a large-scale photovoltaic power generation system and have different data and communication schemes by manufacturers, and to grid-connect them with commercial power, Since a compatible control means must be provided, there is a limitation in the installation and maintenance of a small grid-connected photovoltaic power generation system for general home use.

Therefore, the present invention solves the above problems and can be applied to large-scale photovoltaic power generation system, a pre-programmed DAQ unit (Data Acquisition unit) is to be automatically recognized by the inverter is compatible with different data and communication method for each manufacturer We propose a totally new grid-connected photovoltaic system.

Accordingly, an object of the present invention is to solve the above problems, and more specifically, different data for each manufacturer of an inverter provided in a plurality of power conditioners (PCS) connected to a plurality of solar cell modules and It is a purpose to provide a grid-connected photovoltaic power generation system that is equipped with a data acquisition unit (DAQ unit) that is preprogrammed so that communication types are compatible and automatically recognized. .

According to a feature of the present invention for achieving the above object, a system-linked photovoltaic power generation system, a plurality of solar cell module 100 for converting solar energy into electrical energy; It is connected to each of the plurality of solar cell modules and converts and stabilizes the DC voltage generated through the solar cell module to alternating voltage and loads the distributed power of the solar cell module through the switching unit 500 in case of power failure at the system power side of the commercial power source. A plurality of power conditioners (PCS, 200) each provided with an inverter 210 for supplying power thereto; It is connected to an inverter provided in each of the plurality of power conditioners, and is programmed and stored in advance so that different data and communication types for each manufacturer of the inverter are compatible and automatically recognized, and detecting the amount of generation of the plurality of solar cell modules at regular intervals. A DAQ unit (Data Acquisition unit) 300 having a first DAQ 310 and a second DAQ 320 for detecting abnormalities of a plurality of inverters at a predetermined cycle; Comparing and analyzing the power generation amount of the plurality of solar cell module 100 detected by the DAQ unit and the detection value of the abnormality of the inverter provided in each of the plurality of power conditioner to control the plurality of solar cell module and power conditioner And a control unit 400 including a microcomputer (MICOM, 410) for transmitting a control signal to the switching unit 500 by comparing and analyzing whether a power failure occurs on the grid power supply side, power consumption of the load side 60, and power generation amount of the solar cell module. )Wow; A switching unit 500 for selectively converting power generated from the commercial power source 50 or the plurality of solar cell modules 100 to the load side 60 by the control signal of the control unit; Receiving the output signal of the control unit 400 and the power generation amount of the plurality of solar cell modules detected through the DAQ unit 300 and the abnormality detection value and power consumption amount of the inverter provided in each of the plurality of power conditioners are displayed It provides a grid-connected photovoltaic power generation system, characterized in that consisting of a monitoring unit 600 to enable the administrator to monitor.

Preferably, the first and second DAQ (310, 320) of the DAQ unit (Data Acquisition unit, 300), to recognize the different data and communication type for each manufacturer of the inverter 210 provided in the plurality of power conditioners, respectively An inverter type recognition unit (311, 321), and a detection unit (312, 322) for detecting data of each inverter recognized through the inverter type recognition unit; Converters 313 and 323 for converting the data detected by the detector into the same data type are configured.

Preferably, the DAQ unit 300 further includes an address assigning unit 330 for assigning individual addresses so that the inverters 210 included in the plurality of power conditioners can be identified. It is characterized by.

Preferably, the control unit 400, the power failure incident detection unit 420 for detecting a power failure of the system power supply side of the commercial power supply and transmits a detection signal to the microcomputer 410, and feedback the power consumption of the load side 60 (feedback) And a memory 440 for storing power consumption detected through the feedback circuit unit and data detected through the DAQ unit 300.

Preferably, the monitoring unit 600 is connected to the control unit 400 and a wired or wireless network to provide a portable terminal (600a) and PC (600b) for providing a DAQ detection value and the load side power consumption to the manager of the field or remote site Characterized in that consists of.

Preferably, the portable terminal 600a and the PC 600b of the monitoring unit 600 may include the solar cell module individual daily generation amount display unit 611, the solar cell module individual accumulated generation amount display unit 612, and the entire solar cell module. A character display unit 610 including a daily power generation display unit 613, a cumulative power generation display unit 614 of the entire solar cell module, a daily power consumption display unit 615, and a cumulative power consumption display unit 616, and the plurality of power conditioners, respectively. Inverter individual abnormality alarm unit 620 for displaying the individual abnormality of the inverter 210 provided with an alarm sound, and the search unit 630 of the input means for the administrator to selectively search the character display unit is provided. It features.

Preferably, the photovoltaic power generation system is characterized in that the charge and discharge unit 700 for charging and discharging the electric energy generated from the plurality of solar cell module 100 is further provided.

According to the grid-tied photovoltaic power generation system of the present invention, the following effects are obtained.

 Pre-programmed Data Acquisition unit is configured so that different data and communication types are compatible with each manufacturer of inverters installed in a plurality of power conditioners (PCS) connected to a plurality of solar cell modules. By

(1) With only one DAQ unit, it is possible to collect data of multiple inverters having different data and communication methods for each manufacturer, thereby reducing the cost of installing and maintaining the photovoltaic system.

(2) The control unit that controls the switching unit and the monitoring unit by comparing and analyzing the data detected through the DAQ unit with the power consumption of the load side is configured to enable the integrated control of a plurality of inverters and to easily control the grid connection with the commercial power source. .

(3) The monitoring unit consisting of a PC and a portable terminal can easily monitor the photovoltaic generation, power consumption, and inverter status of the photovoltaic system in real time on site and remotely.

1 is a view showing a conventional photovoltaic power generation system
2 is a view showing the overall configuration of a grid-tied photovoltaic system according to a preferred embodiment of the present invention
3 is a view showing a detailed configuration of a data acquisition unit (DAQ unit) of a grid-tied photovoltaic system according to a preferred embodiment of the present invention
4 is a view showing a detailed configuration of the control unit of the grid-tied photovoltaic power generation system according to a preferred embodiment of the present invention
5 is a view showing the detailed configuration of the monitoring unit of the grid-tied photovoltaic power generation system according to an embodiment of the present invention
6 is a view showing a grid-tied photovoltaic power generation system with a charge and discharge unit according to another embodiment of the present invention

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements throughout. Although the same reference numerals are used in the different drawings, the same reference numerals are used throughout the drawings. The prior art should be interpreted by itself. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 to 6, the present invention is a main technical component of the grid-connected photovoltaic power generation system according to a preferred embodiment, a plurality of solar cell module 100, a plurality of power conditioner (Power Conditioner: PCS, 200), a DAQ unit (Data Acquisition unit, 300), the control unit 400, the switching unit 500, the monitoring unit 600.

Referring to FIG. 2, the plurality of solar cell modules 100 are power generation means for converting solar energy into electrical energy, and unlike large-scale solar power generation systems of 3kw or less in home use, such as large-scale power plants or industrial complexes. A plurality of solar cell modules are clustered and installed in a place where a photovoltaic power generation system is required.

Here, each solar cell module of the plurality of solar cell module is a module by connecting a plurality of solar cells (solar cell) of the semiconductor material in series and parallel, and the type is crystalline silicon solar cell, multi-crystalline silicon solar cell As the thin-film silicon solar cell is various, and this is a well-known technique, detailed description thereof will be omitted.

2 and 3, the plurality of power conditioners (PCS) 200 are connected to each of the plurality of solar cell modules 100 and convert the DC voltage generated through the solar cell module into an AC voltage. And a stabilizer to supply the distributed power of the solar cell module to the load through the switching unit 500 to be described later in case of a power failure at the system power side of the commercial power source. The plurality of power conditioners are each provided with inverters 210. .

In other words, the plurality of power conditioners (PCS, 200) are connected to each solar cell module constituting the plurality of solar modules one-to-one, the same number as the number of solar modules Is done.

On the other hand, since the inverters 210 provided in each of the plurality of power conditioners generally have different data and communication types for different domestic and foreign manufacturers, they are compatible with the data and communication types of the inverters in order to control them or display them on the display means. Control means to be provided.

For this reason, in a large-scale photovoltaic power generation system using a plurality of solar cell modules and inverters, only inverters having the same data and communication type are used, or a plurality of control means compatible with each inverter are required. Increasing becomes less efficient in terms of installation and maintenance costs.

Therefore, the applicant of the present invention has configured a Data Acquisition unit (DAQ unit) 300 to be described later to solve the inverter compatibility problem in a large-scale photovoltaic system, which will be described in detail in the DAQ unit.

On the other hand, the power conditioner (PCS) is a power conditioner for renewable energy generation such as a photovoltaic system, the power produced in the photovoltaic system is a DC voltage, so in order to supply to the load side requiring an AC voltage It must be converted to voltage and stabilized to prevent the failure of the load side in advance. Also, in the event of a power failure of the commercial power source, the solar power generation system equipped with the power conditioner operates independently of the commercial power source to supply power to the load side. Be sure to

Referring again to FIGS. 2 and 3, the data acquisition unit (300) is connected to each of the inverters provided in the plurality of power conditioners to automatically recognize different data and communication types for each manufacturer of the inverters. It is pre-programmed and stored so that the first DAQ 310 for detecting the amount of power generation of the plurality of solar cell modules at a predetermined cycle, and the second DAQ 320 for detecting the abnormality of the plurality of inverters at a predetermined cycle are provided. Data collection means.

Here, the first and second DAQ (310, 320) of the DAQ unit (Data Acquisition unit, 300), the first to recognize the different data and communication type for each manufacturer of the inverter 210 provided in the plurality of power conditioners, respectively A second inverter type recognition unit (311, 321) and first / second detection unit (312, 322) for detecting data of each inverter recognized through the first / second inverter type recognition unit; The first / second converters 313 and 323 which convert the data detected by the first / second detector into the same data type are programmed in advance.

In addition, the DAQ unit 300 further includes an address assigning unit 330 for assigning individual addresses so that the inverters 210 included in the plurality of power conditioners can be identified.

In other words, the DAQ unit pre-programs the recognition program corresponding to the data and communication type of the various inverters to be compatible with a plurality of inverters having different data and communication types for each manufacturer, and according to the type of the inverter The matching recognition program is selected and processed. The same type of inverter can be used during installation and maintenance of the photovoltaic system because it is possible to automatically recognize a plurality of inverters by one data collection means and detect the data of each inverter. Only the use of a single or compatible with each inverter can solve the problem of the need for a large number can significantly reduce the cost.

On the other hand, DAQ (Data Acquisition) is composed of software such as sensor, signal conditioning, DAQ hardware, hardware driver to drive DAQ hardware and data acquisition program to measure analog I / O, digital I / O and counter / timer. In the present invention, the device is used to collect data by integrating a plurality of inverters 210.

Referring to FIGS. 2 and 4, the controller 400 is configured to generate power generation amounts of the plurality of solar cell modules 100 detected through the DAQ unit and abnormality detection values of inverters provided in the plurality of power conditioners, respectively. Comparing and analyzing a plurality of solar cell modules and power conditioners, and controlling the switching unit 500 by comparing and analyzing whether a power failure occurs on the grid power supply side, power consumption of the load side 60, and power generation of the solar cell module. It is a control means provided with a microcomputer (MICOM, 410) for transmitting a signal.

Here, the control unit 400 feeds back the electrostatic accident detection unit 420 which detects a system power supply side power failure of a commercial power supply and transmits a detection signal to the microcomputer 410, and the power consumption of the load side 60. A feedback circuit unit 430 for detecting and a memory 440 for storing the power consumption detected through the feedback circuit unit and the data detected through the DAQ unit 300 are further included. The generation amount of the battery module can be compared, and the data is stored and displayed on the monitoring unit 600 to be described later.

2, the switching unit 500, the switching means for selectively switching the power generated from the commercial power source 50 or a plurality of solar cell module 100 to the load side 60 by the control signal of the control unit to be.

In other words, the switching unit 500 selects and switches load-side supply power according to a control signal of the control unit. In general, the switching unit 500 detects the load-side power consumption through a feedback circuit unit provided in the control unit, In comparison, when the power consumption of the load side is smaller than the power generation of the solar cell module, the power generated from the solar cell module, which is distributed power, is supplied to the load side 60. On the contrary, when the load side power consumption is larger than the power generation of the solar cell module, The commercial power is supplied to the load side 60, and when detecting the occurrence of the electrostatic accident of the commercial power through the electrostatic accident detection unit provided in the control unit, the selected power is switched to supply the generated power from the plurality of solar cell modules which are distributed power to the load side. It is to let.

Referring to FIGS. 2 and 5, the monitoring unit 600 receives output signals of the control unit 400 to generate power and power of the plurality of solar cell modules detected through the DAQ unit 300. An error detection value and power consumption amount of the inverter provided in the conditioner are displayed so that an administrator can monitor the DAQ detection value and load side consumption to the manager of the field or remote site by being connected to the control unit 400 and a wired / wireless network. It is composed of a portable terminal 600a and a PC 600b that provide electric power.

Here, the portable terminal 600a and the PC 600b of the monitoring unit 600 include the solar cell module individual daily generation amount display unit 611, the solar cell module individual accumulated generation amount display unit 612, and the total solar cell module generation amount. A character display unit 610 including a display unit 613, a cumulative power generation display unit 614 of the entire solar cell module, a daily power consumption display unit 615, and a cumulative power consumption display unit 616, and the plurality of power conditioners, respectively. Inverter individual abnormality alarm unit 620 for displaying whether an individual abnormality of the inverter 210 by an alarm sound, and the search unit 630 of the input means for the administrator to selectively search the character display unit.

Therefore, through the monitoring unit, the power generation amount of the plurality of solar cell modules and the abnormality of the inverter 210 provided in each of the plurality of power conditioners and the power consumption of the load side can be monitored at the photovoltaic power generation system and the remote site.

Meanwhile, the grid-tied photovoltaic power generation system according to another exemplary embodiment of the present invention with reference to FIG. 6 may further include a charge / discharge unit 700 for charging and discharging electric energy generated from the plurality of solar cell modules 100. have.

Here, the charging and discharging unit 700 is a secondary battery or a super capacitor, which is a charge and discharge circuit unit 710 for charging and discharging electric energy generated from a plurality of solar cell modules 100 and a storage means 720 of the generated electric energy. It is composed of a (super capacitor) to store the amount of electrical energy generated from a plurality of solar cell module, according to which is further provided with an inverter 70 for converting the DC voltage of the storage unit into an AC voltage, the inverter is connected to the DAQ unit The control unit and the switching unit to control the supply to the load side along with the power generated from the commercial power of the AC 220V and the solar cell module.

As such, in the grid-connected photovoltaic power generation system according to the preferred embodiment of the present invention, data and communication types different for each manufacturer of inverters provided in a plurality of power conditioners (PCS) connected to a plurality of solar cell modules, respectively. Pre-programmed DAQ unit (Data Acquisition unit) is configured to be compatible and automatically recognized, it is possible to collect data of a large number of inverters having different data and communication method by manufacturer with only one DAQ unit It is possible to reduce installation and maintenance costs, and a control unit is configured to control the switching unit and the monitoring unit by comparing and analyzing the data detected through the DAQ unit with the power consumption of the load side. It is easy to control the system linkage with.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

50: commercial power supply 60: load
70: inverter 100: a plurality of solar cell modules
200: power conditioner (PCS)
210: inverter
300: DAQ unit (Data Acquisition unit)
310: first DAQ 311,321: first / second inverter type recognition unit
312, 322: first and second detectors 313, 323: first and second converters
320: second DAQ 330: address assignment unit
400: control unit 410: MICOM
420: electrostatic accident detection unit 430: feedback circuit unit
440: memory 500: switching unit
600: monitoring unit 600a: portable terminal
600b: PC 610: character display unit
620: Inverter individual abnormality alarm unit
630: search unit 700: storage unit
710: charge and discharge circuit portion 720: storage means

Claims (7)

In the grid-tied photovoltaic system,
A plurality of solar cell modules 100 for converting solar energy into electrical energy;
It is connected to each of the plurality of solar cell modules and converts and stabilizes the DC voltage generated through the solar cell module to alternating voltage and loads the distributed power of the solar cell module through the switching unit 500 in case of power failure at the system power side of the commercial power source. A plurality of power conditioners (PCS, 200) each provided with an inverter 210 for supplying power thereto;
It is connected to an inverter provided in each of the plurality of power conditioners, and is programmed and stored in advance so that different data and communication types for each manufacturer of the inverter are compatible and automatically recognized, and detecting the amount of generation of the plurality of solar cell modules at regular intervals. A DAQ unit (Data Acquisition unit) 300 having a first DAQ 310 and a second DAQ 320 for detecting abnormalities of a plurality of inverters at a predetermined cycle;
Comparing and analyzing the power generation amount of the plurality of solar cell module 100 detected by the DAQ unit and the detection value of the abnormality of the inverter provided in each of the plurality of power conditioner to control the plurality of solar cell module and power conditioner And a control unit 400 including a microcomputer (MICOM, 410) for transmitting a control signal to the switching unit 500 by comparing and analyzing whether a power failure occurs on the grid power supply side, power consumption of the load side 60, and power generation amount of the solar cell module. )Wow;
A switching unit 500 for selectively converting power generated from the commercial power source 50 or the plurality of solar cell modules 100 to the load side 60 by the control signal of the control unit;
Receiving the output signal of the control unit 400 and the power generation amount of the plurality of solar cell modules detected through the DAQ unit 300 and the abnormality detection value and power consumption amount of the inverter provided in each of the plurality of power conditioners are displayed Grid-connected photovoltaic power generation system, characterized in that consisting of a monitoring unit 600 to enable the administrator to monitor.
The method according to claim 1,
The first and second DAQs 310 and 320 of the data acquisition unit 300 recognize first data and communication types of different manufacturers for the inverters 210 included in the plurality of power conditioners, respectively. A second inverter type recognition unit 311 and 321 and a first / second detection unit 312 and 322 for detecting data of each inverter recognized through the first and second inverter type recognition units; And a first / second converter (313, 323) for converting the data detected by the first / second detector into the same data type, respectively.
The method according to claim 1,
The DAQ unit 300 further includes an address assigning unit 330 configured to assign an individual address so that the inverters 210 included in the plurality of power conditioners can be identified. Grid-connected photovoltaic power generation system.
The method according to claim 1,
The control unit 400 detects the system power supply side power failure of the commercial power supply and feeds back the detection of the power consumption of the load side 60 and the power failure incident detection unit 420 which transmits a detection signal to the microcomputer 410. A grid-connected photovoltaic system further comprising a feedback circuit unit 430 and a memory 440 for storing the power consumption detected through the feedback circuit unit and the data detected through the DAQ unit 300. .
The method according to claim 1,
The monitoring unit 600 is composed of a portable terminal 600a and a PC 600b which are connected to the control unit 400 and a wired / wireless network to provide a DAQ detection value and a load side power consumption to a manager at a site or a remote site. Grid-connected photovoltaic power generation system characterized by.
6. The method of claim 5,
On the portable terminal 600a and the PC 600b of the monitoring unit 600, the solar cell module individual daily generation amount display unit 611, the solar cell module individual accumulated generation amount display unit 612, the solar cell module daily generation amount display unit ( 613, a character display unit 610 including a cumulative power generation display unit 614, a daily power consumption display unit 615, and a cumulative power consumption display unit 616 of the solar cell module, and an inverter provided in each of the plurality of power conditioners. Inverter individual abnormality alarm unit 620 for displaying whether or not the individual abnormality of the alarm 210, and the search unit 630 of the input means for the administrator to selectively search the text display unit is provided with Linked Solar Power System.
The method according to claim 1,
The photovoltaic power generation system, grid-connected photovoltaic power generation system characterized in that it is further provided with a charge and discharge unit 700 for charging and discharging electrical energy generated from a plurality of solar cell module (100).

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