CN116699298A - Grid-connected testing device and method for photovoltaic energy storage composite power station - Google Patents
Grid-connected testing device and method for photovoltaic energy storage composite power station Download PDFInfo
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- CN116699298A CN116699298A CN202310996294.7A CN202310996294A CN116699298A CN 116699298 A CN116699298 A CN 116699298A CN 202310996294 A CN202310996294 A CN 202310996294A CN 116699298 A CN116699298 A CN 116699298A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 124
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- 238000010248 power generation Methods 0.000 claims abstract description 41
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- 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
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The application provides a grid-connected testing device and method for a photovoltaic energy storage composite power station, comprising the following steps: the system comprises an alternating current switch cabinet, a functional module, a measuring module and an upper computer, wherein when the upper computer receives a test instruction, the switch between a photovoltaic power generation system to be tested and a collecting bus in a first station is controlled to be closed, and/or the switch between an energy storage system to be tested and a collecting bus in a second station is controlled to be closed, the alternating current control cabinet is controlled to switch a circuit, test data generated by the measuring module is received, the test data are analyzed and calculated, and a test report is generated based on the analysis and calculation result.
Description
Technical Field
The application relates to the technical field of grid-connected detection of new energy power stations, in particular to a grid-connected testing device and method of a photovoltaic energy storage composite power station.
Background
According to national or industry standard requirements, the photovoltaic power station should be subjected to and pass corresponding grid-connected tests before grid connection, including electric energy quality tests, active/reactive power control capability tests, high/low voltage ride through capability tests, operation adaptability tests, protection performance tests and the like. The centralized photovoltaic power station is required to be provided with the energy storage capacity with a specified proportion, the centralized photovoltaic power station which is put into operation at present and under construction is provided with an energy storage system, and corresponding grid-connected tests including electric energy quality tests, active/reactive power control capability tests, power grid adaptability tests, protection performance tests, communication and automation tests and the like are required to be carried out before the energy storage system is connected with the grid.
In the prior art, for a grid-connected test mode of a photovoltaic energy storage composite power station formed by a photovoltaic system and an energy storage system, the test is mainly carried out before the photovoltaic system and the energy storage system are connected to the grid respectively, repeated wiring and test parameter setting are needed, the test time is long, and the test efficiency is low.
Disclosure of Invention
In view of the above, the embodiment of the application provides a grid-connected testing device for a photovoltaic energy storage composite power station, which solves the problems of low testing efficiency caused by long testing time consumption due to repeated manual wiring and test parameter setting.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
the embodiment of the application discloses a grid-connected testing device of a photovoltaic energy storage composite power station, which comprises the following components: the system comprises an alternating-current switching cabinet, a functional module, a measuring module and an upper computer;
the upper computer is respectively connected with the alternating current switching cabinet, the functional module and the measuring module; the measuring module is connected with the functional module; the alternating current control cabinet is respectively connected with a first in-station collecting bus, a second in-station collecting bus, the upper computer and the functional module, all photovoltaic power generation systems in the photovoltaic energy storage composite power station are collected in parallel to the first in-station collecting bus through corresponding switches, and all energy storage systems in the photovoltaic energy storage composite power station are collected in parallel to the second in-station collecting bus through corresponding switches;
the upper computer is used for controlling the switch between the photovoltaic power generation system to be tested and the collecting bus in the first station to be closed and/or controlling the switch between the energy storage system to be tested and the collecting bus in the second station to be closed when receiving the test instruction; controlling the alternating current control cabinet to switch a circuit; receiving test data generated by the functional module collected by the measuring module, analyzing and calculating the test data, and generating a test report based on the analysis and calculation results;
the alternating current control cabinet is used for responding to the control of the upper computer to perform circuit switching, so that the first in-station collecting bus and/or the second in-station collecting bus are connected with the functional module, or the first in-station collecting bus and the second in-station collecting bus are connected;
the functional module is used for executing each test item and generating corresponding test data;
the measuring module is used for collecting the test data generated by the functional module and sending the test data to the upper computer.
Preferably, the ac switching cabinet includes: the device comprises a first switch, a second switch and a third switch, wherein one end of the first switch is connected with a collecting bus in a first station, the other end of the first switch is connected with a collecting bus in a second station, one end of the second switch is connected with the collecting bus in the first station, the other end of the second switch is connected with a functional module, one end of the third switch is connected with the collecting bus in the second station, the other end of the third switch is connected with the functional module, and the alternating current switching cabinet is specifically used for:
and responding to the control of the upper computer, closing one of the first switch, the second switch and the third switch, or closing the second switch and the third switch, so that the functional module executes corresponding test items.
Preferably, the ac control cabinet further includes: the controller is arranged between the collecting bus in the second station and the first switch;
the controller is used for controlling energy flow between the photovoltaic power generation system and the energy storage system when the first switch is closed and/or controlling energy flow between the energy storage systems when the third switch is closed, so that the functional module executes corresponding test items.
Preferably, the functional module includes: the system comprises one or more of a power grid disturbance unit, an electric energy quality measurement unit, a power control unit, a power analysis unit, an RLC adjustable load and an island generation unit;
the power grid disturbance unit is used for outputting different voltages, frequencies and powers so as to simulate the condition of a power grid and perform grid-connected test;
the electric energy quality measuring unit is used for measuring and recording three-phase imbalance parameters and harmonic parameters of voltage and recording voltage and current waveforms;
the power analysis unit is used for carrying out power calculation on the collected voltage and current signals to obtain and output power;
the RLC adjustable load comprises a plurality of resistors, inductors and capacitors, and is used for adjusting the load during load test;
the island generation unit is used for carrying out island protection test.
Preferably, the method further comprises: the voltage transformer and the current transformer are respectively arranged between the first station internal collection bus and the alternating current control cabinet, between the second station internal collection bus and the alternating current control cabinet and between the measuring module and the power grid;
the voltage transformer is used for detecting a voltage value, and the voltage value is collected by the measurement module and sent to the upper computer;
the current transformer is used for detecting a current value, and the current value is collected by the measuring module and sent to the upper computer.
Preferably, the measurement module includes: the system comprises a data acquisition unit, a voltage transformer and a current transformer;
the data acquisition unit is used for acquiring the test data generated by the functional module and sending the test data to the upper computer;
the voltage transformer is used for collecting voltage values between the first station internal collection bus or the second station internal collection bus and the functional module and sending the voltage values to the upper computer;
the current transformer is used for collecting the current value of the first station internal collection bus or the second station internal collection bus flowing through the functional module and sending the current value to the upper computer.
Preferably, the method further comprises: the container reserves wiring ports of the first in-station collecting bus and the second in-station collecting bus;
the container is used for integrating the alternating current switching cabinet, the functional module, the measuring module and the upper computer into the container, and the first in-station collecting bus and the second in-station collecting bus are connected with the alternating current switching cabinet through corresponding wiring ports.
Preferably, the upper computer is connected with the alternating current switching cabinet, the functional module and the measuring module through a wireless network.
Preferably, the method further comprises: the display equipment is connected with the upper computer;
and the display equipment is used for displaying the test report generated by the upper computer.
The second aspect of the embodiment of the application discloses a grid-connected testing method of a photovoltaic energy storage composite power station, which is applicable to any one of the grid-connected testing devices of the photovoltaic energy storage composite power station disclosed in the first aspect of the embodiment of the application, and comprises the following steps:
when a test instruction is received through the upper computer, a switch between the photovoltaic power generation system to be tested and the collecting bus in the first station is controlled to be closed, and/or a switch between the energy storage system to be tested and the collecting bus in the second station is controlled to be closed;
the upper computer is used for controlling the alternating current control cabinet to switch the circuit;
the alternating current control cabinet responds to the control of the upper computer to perform circuit switching, so that the first in-station collecting bus and/or the second in-station collecting bus are connected with a functional module, or the first in-station collecting bus and the second in-station collecting bus are connected;
executing each test item by using the functional module and generating corresponding test data;
collecting test data generated by the functional module by using a measurement module, and sending the test data to the upper computer;
the upper computer receives the test data generated by the measurement module, analyzes and calculates the test data, and generates a test report based on the analysis and calculation results.
Based on the above-mentioned embodiment of the present application, a grid-connected testing device and method for a photovoltaic energy storage composite power station are provided, where the device includes: the system comprises an alternating-current switching cabinet, a functional module, a measuring module and an upper computer; the upper computer is respectively connected with the alternating current switching cabinet, the functional module and the measuring module; the measuring module is connected with the functional module; the alternating current control cabinet is respectively connected with a first in-station collecting bus, a second in-station collecting bus, the upper computer and the functional module, all photovoltaic power generation systems in the photovoltaic energy storage composite power station are collected in parallel to the first in-station collecting bus through corresponding switches, and all energy storage systems in the photovoltaic energy storage composite power station are collected in parallel to the second in-station collecting bus through corresponding switches; the upper computer is used for controlling the switch between the photovoltaic power generation system to be tested and the collecting bus in the first station to be closed and/or controlling the switch between the energy storage system to be tested and the collecting bus in the second station to be closed when receiving the test instruction; controlling the alternating current control cabinet to switch a circuit; receiving test data generated by the functional module collected by the measuring module, analyzing and calculating the test data, and generating a test report based on the analysis and calculation results; the alternating current control cabinet is used for responding to the control of the upper computer to perform circuit switching, so that the first in-station collecting bus and/or the second in-station collecting bus are connected with the functional module, or the first in-station collecting bus and the second in-station collecting bus are connected; the functional module is used for executing each test item and generating corresponding test data; the measuring module is used for collecting the test data generated by the functional module and sending the test data to the upper computer. In this scheme, carry out once wiring between photovoltaic energy storage composite power station and the alternating current control cabinet, can carry out the whole test of photovoltaic energy storage composite power station, solved needs the manual work to repeat wiring and set up test parameter, the test is consuming time very long, leads to the problem that test efficiency is low.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a test loop diagram of a grid-connected test device of a photovoltaic energy storage composite power station, which is disclosed by the embodiment of the application;
fig. 2 is a schematic diagram of a grid-connected testing device of a photovoltaic energy storage composite power station according to an embodiment of the present application;
fig. 3 is a wiring circuit diagram of an ac switch cabinet according to an embodiment of the present application;
fig. 4 is a flowchart of a grid-connected testing method of a photovoltaic energy storage composite power station according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the present disclosure, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
According to the background technology, in the prior art, for a grid-connected test mode of a photovoltaic energy storage composite power station formed by a photovoltaic system and an energy storage system, the photovoltaic system and the energy storage system are mainly tested before being connected to the grid respectively, manual repeated wiring and test parameter setting are needed, the test time is long, and the test efficiency is low.
Therefore, the embodiment of the application discloses a grid-connected testing device of a photovoltaic energy storage composite power station, which comprises the following components: the system comprises an alternating current switch cabinet, a functional module, a measuring module and an upper computer, wherein when the upper computer receives a test instruction, the switch between a photovoltaic power generation system to be tested and a collecting bus in a first station is controlled to be closed, and/or the switch between an energy storage system to be tested and a collecting bus in a second station is controlled to be closed, the alternating current control cabinet is controlled to switch a circuit, test data generated by the measuring module is received, the test data are analyzed and calculated, and a test report is generated based on the analysis and calculation result.
Fig. 1 is a test circuit diagram of a grid-connected test device of a photovoltaic energy storage composite power station according to an embodiment of the present application.
The photovoltaic energy storage composite power station comprises n photovoltaic power generation systems and m energy storage systems, the n photovoltaic power generation systems are connected in parallel with a first station collecting bus through corresponding switches (KA 1 to KAn), the m energy storage systems are connected in parallel with a second station collecting bus through corresponding switches (KB 1 to KBm), and the first station collecting bus is connected with the second station collecting bus and then connected with a main step-up transformer which is connected with a power grid.
It should be noted that, n photovoltaic power generation systems and m energy storage systems can be controlled by corresponding switches to be connected to the first in-station collecting bus and the second in-station collecting bus, and n and m are positive integers.
The collecting bus in the first station and the collecting bus in the second station are generally 10kV or 35kV alternating current, the existing photovoltaic energy storage power station is generally 10kV or 35kV alternating current voltage, and then the voltage is further boosted to 110kV through a main booster transformer to be connected with a power grid.
Each photovoltaic power generation system is composed of a photovoltaic array, a photovoltaic inverter and a photovoltaic box transformer, and specifically, the photovoltaic array is connected with the photovoltaic inverter, and the photovoltaic inverter is connected with the photovoltaic box transformer to form the photovoltaic power generation system.
Each energy storage system is formed by an energy storage battery, an energy storage converter and an energy storage box transformer, and specifically, the energy storage battery is connected with the energy storage converter, and the energy storage converter is connected with the energy storage box transformer to form the energy storage system.
The grid-connected testing device of the photovoltaic energy storage composite power station is respectively connected with the first in-station collecting bus, the second in-station collecting bus and the main step-up transformer, so as to be used for carrying out the subsequent grid-connected pre-testing on the photovoltaic energy storage composite power station.
Based on the test loop diagram of the grid-connected testing device of the photovoltaic energy storage composite power station disclosed by the embodiment of the application, as shown in fig. 2, the test loop diagram of the grid-connected testing device of the photovoltaic energy storage composite power station disclosed by the embodiment of the application is an architecture diagram of the grid-connected testing device of the photovoltaic energy storage composite power station, and the device comprises: an alternating current switch cabinet 1, a functional module 2, a measuring module 3 and an upper computer 4.
The connection mode of the grid-connected testing device of the photovoltaic energy storage composite power station is as follows:
the upper computer 4 is respectively connected with the alternating current switching cabinet 1, the functional module 2 and the measuring module 3, and the measuring module 3 is connected with the functional module 2.
In one embodiment, the upper computer 4 is wirelessly connected with the ac switch cabinet 1, the functional module 2 and the measurement module 3.
The alternating current control cabinet 1 is respectively connected with a first in-station collecting bus, a second in-station collecting bus, an upper computer 4 and a functional module 2, all photovoltaic power generation systems in the photovoltaic energy storage composite power station are connected in parallel through corresponding switches to collect the first in-station collecting bus, and all energy storage systems in the photovoltaic energy storage composite power station are connected in parallel through corresponding switches to collect the second in-station collecting bus.
The grid-connected testing device for the photovoltaic energy storage composite power station is used for testing the photovoltaic energy storage composite power station and comprises the following specific implementation steps:
when the upper computer 4 receives the test instruction, a switch between the photovoltaic power generation system to be tested and the collecting bus in the first station is controlled to be closed, and/or a switch between the energy storage system to be tested and the collecting bus in the second station is controlled to be closed.
It should be noted that the test instruction includes information of the photovoltaic power generation system or the energy storage system to be tested and project information to be tested.
For example, as shown in fig. 1, the photovoltaic power generation system includes photovoltaic power generation systems 1 to n, which are respectively connected in parallel to the collecting bus in the first station through switches KA1 to KAn, and when the upper computer 4 receives a test instruction of the photovoltaic power generation systems 1 to 3, the switches KA1 to KA3 are controlled to be closed.
The energy storage system comprises energy storage systems 1 to m which are respectively connected in parallel with the second station internal collection bus through switches KB1 to KBm, and when the upper computer 4 receives a test instruction of the energy storage systems 1 to 3, the switches KB1 to KB3 are controlled to be closed.
Then, the upper computer 4 controls the ac control cabinet 1 to perform circuit switching according to the received test instruction, and the ac control cabinet 1 responds to the control of the upper computer 4 to perform circuit switching, so that the first in-station collecting bus and/or the second in-station collecting bus are connected with the functional module 2, or the first in-station collecting bus and the second in-station collecting bus are connected.
When the first in-station collecting bus and/or the second in-station collecting bus are connected with the functional module 2, or after the first in-station collecting bus and the second in-station collecting bus are connected, the functional module 2 executes each test item according to the test item information to be executed sent by the upper computer 4 and generates corresponding test data.
The test item information to be executed is obtained from the received test instruction by the upper computer 4.
In an embodiment, the functional module 2 comprises one or more of a combination of grid perturbation unit, power quality measurement unit, power control unit, power analysis unit, RLC tunable load, islanding unit, etc.
The power grid disturbance unit is used for outputting different voltages, frequencies and powers, simulating the power grid condition, the electric energy quality measurement unit is used for measuring and recording parameters such as three-phase unbalance of grid-connected point voltage, harmonic waves and the like, recording voltage and current waveforms, the power analysis unit is used for carrying out power calculation on collected voltage and current signals in the measuring process, the RLC adjustable load comprises a plurality of resistors, inductors and capacitors and is used for realizing load adjustment during load test, and the island generation unit is used for carrying out island protection test.
It should be noted that, as the ac switching cabinet 1 switches to a different connection condition, the test items executed by the functional module 2 are different, specifically as follows:
when the ac control cabinet 1 is switched to the first in-station collection bus connected with the functional module 2, the functional module 2 executes test items for the photovoltaic power generation system connected to the first collection bus, the test items for the photovoltaic power generation system including: and testing power grid adaptability, power quality, high/low voltage ride through, power control and the like.
When the ac control cabinet 1 is switched to the second station where the collecting bus is connected to the functional module 2, the functional module 2 executes test items for the energy storage system connected to the second collecting bus, where the test items for the energy storage system include: and testing items such as power grid adaptability, electric energy quality, power control and the like.
When the ac control cabinet 1 is switched to the first in-station collecting bus and the second in-station collecting bus both connected with the functional module 2, the functional module 2 executes test items for the whole photovoltaic energy storage composite power station, and the test items for the whole photovoltaic energy storage composite power station include: and testing items such as power quality, power control and the like of the whole station.
When the alternating current control cabinet 1 is switched to the connection of the first station internal collection bus and the second station internal collection bus, the photovoltaic power generation system generates electricity to charge the energy storage system, and the functional module 2 performs the charging test of the energy storage system, so that the photovoltaic power generation system can be subjected to the power generation test at the same time.
Then, when the connection state of the collecting bus in the first station and the collecting bus in the second station is switched to the connection state of the collecting bus in the second station and the functional module 2, the energy storage system 1 discharges to charge the energy storage system 2 and/or the energy storage system m, and the functional module 2 detects the voltage, the charging/discharging current and the charging/discharging energy of the energy storage system 1 and the energy storage system 2 and/or the energy storage system m.
It should be noted that, the numbers 1 and 2 are not specific, and may be any two groups of energy storage systems to be tested.
The measurement module 3 collects the test data generated by the functional module 2, and sends the test data to the upper computer 4, and the upper computer 4 receives the test data generated by the functional module 2 collected by the measurement module 3, analyzes and calculates the test data, and generates a test report based on the analysis and calculation results.
In an embodiment, the upper computer 4 includes functions of remote instruction issuing, data receiving, data storage, data analysis and calculation, report generation and the like, and functions of remote switch opening and closing, control of each functional module and the like.
In an embodiment, the measurement module 3 comprises a data acquisition unit, a current transformer and a voltage transformer.
In an embodiment, the grid-connected testing device of the photovoltaic energy storage composite power station further comprises a display device connected with the upper computer, and the display device is used for displaying the test data and generating a test report by the upper computer 4.
In an embodiment, for convenience of transportation, the grid-connected test device of the photovoltaic energy storage composite power station further comprises a container, wherein a wiring port of the first in-station collecting bus and a wiring port of the second in-station collecting bus are reserved in the container and used for integrating the alternating current switching cabinet 1, the functional module 2, the measuring module 3 and the upper computer 4 into the container, and the first in-station collecting bus and the second in-station collecting bus are connected with the alternating current switching cabinet through corresponding wiring ports.
Based on the embodiment of the application, a grid-connected testing device of a photovoltaic energy storage composite power station is disclosed, comprising: the system comprises an alternating current switch cabinet, a functional module, a measuring module and an upper computer, wherein when the upper computer receives a test instruction, the switch between a photovoltaic power generation system to be tested and a collecting bus in a first station is controlled to be closed, and/or the switch between an energy storage system to be tested and a collecting bus in a second station is controlled to be closed, the alternating current control cabinet is controlled to switch a circuit, test data generated by the measuring module is received, the test data are analyzed and calculated, and a test report is generated based on the analysis and calculation result.
Based on the above-mentioned embodiment of the present application, as shown in fig. 3, a connection circuit diagram of an ac switch cabinet disclosed in the embodiment of the present application is disclosed, where the ac switch cabinet may be the ac switch cabinet 1 in fig. 2, and the ac switch cabinet includes: a first switch S1, a second switch S2 and a third switch S3.
One end of the first switch S1 is connected with the first station internal collection bus, the other end of the first switch S1 is connected with the second station internal collection bus, one end of the second switch S2 is connected with the first station internal collection bus, the other end of the second switch S2 is connected with the functional module, one end of the third switch S3 is connected with the second station internal collection bus, and the other end of the third switch S3 is connected with the functional module.
An alternating current switching cabinet for: in response to the control of the upper computer, performing circuit switching, where specific circuit switching conditions include: one of the first switch S1, the second switch S2 and the third switch S3 is closed, or the second switch S2 and the third switch S3 are closed, so that the functional module executes the corresponding test item.
Specifically, when the second switch S2 is closed and the first switch S1 and the third switch S3 are opened, that is, when the ac control cabinet is switched to the first in-station collecting bus and connected with the functional module, the functional module executes a test item for the photovoltaic power generation system connected to the first collecting bus, where the test item of the photovoltaic power generation system includes: and testing power grid adaptability, power quality, high/low voltage ride through, power control and the like.
When the third switch S3 is closed and the first switch S1 and the second switch S2 are opened, that is, when the ac control cabinet is switched to the second station, the collecting bus is connected to the functional module, the functional module executes a test item for the energy storage system connected to the second collecting bus, where the test item of the energy storage system includes: and testing items such as power grid adaptability, electric energy quality, power control and the like.
When the second switch S2 and the third switch S3 are closed and the first switch S1 is opened, that is, when the ac control cabinet is switched to the state that the collecting bus in the first station and the collecting bus in the second station are both connected with the functional module, the functional module executes a test item for the whole station of the photovoltaic energy storage composite power station, and the test item for the whole station of the photovoltaic energy storage composite power station comprises: and testing items such as power quality, power control and the like of the whole station.
When the first switch S1 is closed, the second switch S2 and the third switch S3 are opened, namely when the alternating current control cabinet is switched to the connection of the collecting bus in the first station and the collecting bus in the second station, the photovoltaic power generation system generates power to charge the energy storage system, and the functional module performs the charging test of the energy storage system.
Then, the first switch S1 is opened, the third switch S3 is closed, that is, the connection state of the collecting bus in the first station and the collecting bus in the second station of the ac switching cabinet is switched to the connection state of the collecting bus in the second station and the functional module, the energy storage system 1 discharges to charge the energy storage system 2 and/or the energy storage system m, and the functional module detects the voltage, the charge/discharge current and the charge/discharge energy of the energy storage system 1 and the energy storage system 2 and/or the energy storage system m.
It should be noted that, the numbers 1 and 2 are not specific, and may be any two groups of energy storage systems to be tested.
And after each test is finished, all the switches in the test loop are disconnected, including the switches in the alternating current switching cabinet, the switches between the photovoltaic power generation system and the collecting bus in the first station and the switches between the energy storage system and the collecting bus in the second station.
In one embodiment, the ac control cabinet further comprises: and the controller is arranged between the collecting bus in the second station and the first switch S1 and is used for controlling the energy flow between the photovoltaic power generation system and the energy storage system when the first switch S1 is closed or controlling the energy flow between the energy storage systems only when the third switch S3 is closed so as to enable the functional module to execute corresponding test items (such as charge and discharge test items).
Based on the embodiment of the application, an alternating current switching cabinet is disclosed, which comprises: the first switch, the second switch and the third switch are switched on in response to the control of the upper computer, or one of the first switch, the second switch and the third switch is switched on, or the second switch and the third switch are switched on, so that the functional module executes corresponding test items.
As shown in fig. 4, a flowchart of a method for testing grid connection of a photovoltaic energy storage composite power station disclosed in the embodiment of the present application is applicable to the device for testing grid connection of a photovoltaic energy storage composite power station disclosed in the embodiment of the present application, and the method mainly includes the following steps:
step S401: when a test instruction is received through the upper computer, a switch between the photovoltaic power generation system to be tested and the collecting bus in the first station is controlled to be closed, and/or a switch between the energy storage system to be tested and the collecting bus in the second station is controlled to be closed.
In step S401, the photovoltaic energy storage composite power station includes n photovoltaic power generation systems and m energy storage systems, the n photovoltaic power generation systems are connected in parallel to the first in-station collection bus bar through corresponding switches (KA 1 to KAn), and the m energy storage systems are connected in parallel to the second in-station collection bus bar through corresponding switches (KB 1 to KBm).
The test instruction comprises information of a photovoltaic power generation system or an energy storage system to be tested and project information to be tested, and controls the switch between the photovoltaic power generation system to be tested and the collecting bus in the first station to be closed and/or controls the switch between the energy storage system to be tested and the collecting bus in the second station to be closed based on the information of the photovoltaic power generation system to be tested or the energy storage system to be tested.
Step S402: and controlling the alternating current control cabinet to switch the circuit by using the upper computer.
In step S402, the upper computer sends an opening or closing instruction of the switch to the ac control cabinet to control the ac control cabinet to switch the circuit.
Step S403: the alternating current control cabinet responds to the control of the upper computer to perform circuit switching, so that the first in-station collecting bus and/or the second in-station collecting bus are connected with the functional module, or the first in-station collecting bus and the second in-station collecting bus are connected.
In step S403, the ac control cabinet includes a first switch, a second switch, and a third switch, and one of the first switch S1, the second switch S2, and the third switch S3 is closed, or the second switch S2 and the third switch S3 are closed, so that the functional module executes a corresponding test item.
Step S404: and executing each test item by using the functional module and generating corresponding test data.
In an embodiment, the functional module includes one or more of a power grid disturbance unit, a power quality measurement unit, a power control unit, a power analysis unit, an RLC tunable load, an island generation unit, and the like.
In step S404, as the ac switch cabinet 1 is switched to a different connection condition, the test items executed by the functional module 2 are different, and detailed description thereof is omitted herein.
Step S405: and collecting the test data generated by the functional module by using the measuring module and sending the test data to the upper computer.
Step S406: the upper computer receives the test data generated by the measurement module acquisition function module, analyzes and calculates the test data, and generates a test report based on the analysis and calculation results.
In an embodiment, the upper computer comprises functions of remote instruction issuing, data receiving, data storage, data analysis and calculation, report generation and the like, and functions of remote switch opening and closing, control of each functional module and the like of an operator.
Based on the embodiment of the application, the grid-connected test method of the photovoltaic energy storage composite power station is disclosed, when an upper computer receives a test instruction, the upper computer controls the switch between a photovoltaic power generation system to be tested and a collecting bus in a first station to be closed, and/or controls the switch between an energy storage system to be tested and a collecting bus in a second station to be closed, controls an alternating current control cabinet to switch a circuit, receives test data generated by a functional module collected by a measuring module, analyzes and calculates the test data, generates a test report based on the analysis and calculation result, and in the scheme, the photovoltaic energy storage composite power station and the alternating current control cabinet are subjected to one-time wiring, so that all tests of the photovoltaic energy storage composite power station can be performed, the problems that manual repeated wiring and test parameter setting are needed, the test time is long, and the test efficiency is low are solved.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A photovoltaic energy storage composite power station grid-connected testing device, characterized in that the device comprises: the system comprises an alternating-current switching cabinet, a functional module, a measuring module and an upper computer;
the upper computer is respectively connected with the alternating current switching cabinet, the functional module and the measuring module; the measuring module is connected with the functional module; the alternating current control cabinet is respectively connected with a first in-station collecting bus, a second in-station collecting bus, the upper computer and the functional module, all photovoltaic power generation systems in the photovoltaic energy storage composite power station are collected in parallel to the first in-station collecting bus through corresponding switches, and all energy storage systems in the photovoltaic energy storage composite power station are collected in parallel to the second in-station collecting bus through corresponding switches;
the upper computer is used for controlling the switch between the photovoltaic power generation system to be tested and the collecting bus in the first station to be closed and/or controlling the switch between the energy storage system to be tested and the collecting bus in the second station to be closed when receiving the test instruction; controlling the alternating current control cabinet to switch a circuit; receiving test data generated by the functional module collected by the measuring module, analyzing and calculating the test data, and generating a test report based on the analysis and calculation results;
the alternating current control cabinet is used for responding to the control of the upper computer to perform circuit switching, so that the first in-station collecting bus and/or the second in-station collecting bus are connected with the functional module, or the first in-station collecting bus and the second in-station collecting bus are connected;
the functional module is used for executing each test item and generating corresponding test data;
the measuring module is used for collecting the test data generated by the functional module and sending the test data to the upper computer.
2. The apparatus of claim 1, wherein the ac switching cabinet comprises: the device comprises a first switch, a second switch and a third switch, wherein one end of the first switch is connected with a collecting bus in a first station, the other end of the first switch is connected with a collecting bus in a second station, one end of the second switch is connected with the collecting bus in the first station, the other end of the second switch is connected with a functional module, one end of the third switch is connected with the collecting bus in the second station, the other end of the third switch is connected with the functional module, and the alternating current switching cabinet is specifically used for:
and responding to the control of the upper computer, closing one of the first switch, the second switch and the third switch, or closing the second switch and the third switch, so that the functional module executes corresponding test items.
3. The apparatus of claim 2, wherein the ac control cabinet further comprises: the controller is arranged between the collecting bus in the second station and the first switch;
the controller is used for controlling energy flow between the photovoltaic power generation system and the energy storage system when the first switch is closed and/or controlling energy flow between the energy storage systems when the third switch is closed, so that the functional module executes corresponding test items.
4. The apparatus of claim 1, wherein the functional module comprises: the system comprises one or more of a power grid disturbance unit, an electric energy quality measurement unit, a power control unit, a power analysis unit, an RLC adjustable load and an island generation unit;
the power grid disturbance unit is used for outputting different voltages, frequencies and powers so as to simulate the condition of a power grid and perform grid-connected test;
the electric energy quality measuring unit is used for measuring and recording three-phase imbalance parameters and harmonic parameters of voltage and recording voltage and current waveforms;
the power analysis unit is used for carrying out power calculation on the collected voltage and current signals to obtain and output power;
the RLC adjustable load comprises a plurality of resistors, inductors and capacitors, and is used for adjusting the load during load test;
the island generation unit is used for carrying out island protection test.
5. The apparatus as recited in claim 1, further comprising: the voltage transformer and the current transformer are respectively arranged between the first station internal collection bus and the alternating current control cabinet, between the second station internal collection bus and the alternating current control cabinet and between the measuring module and the power grid;
the voltage transformer is used for detecting a voltage value, and the voltage value is collected by the measurement module and sent to the upper computer;
the current transformer is used for detecting a current value, and the current value is collected by the measuring module and sent to the upper computer.
6. The apparatus of claim 1, wherein the measurement module comprises: the system comprises a data acquisition unit, a voltage transformer and a current transformer;
the data acquisition unit is used for acquiring the test data generated by the functional module and sending the test data to the upper computer;
the voltage transformer is used for collecting voltage values between the first station internal collection bus or the second station internal collection bus and the functional module and sending the voltage values to the upper computer;
the current transformer is used for collecting the current value of the first station internal collection bus or the second station internal collection bus flowing through the functional module and sending the current value to the upper computer.
7. The apparatus as recited in claim 1, further comprising: the container reserves wiring ports of the first in-station collecting bus and the second in-station collecting bus;
the container is used for integrating the alternating current switching cabinet, the functional module, the measuring module and the upper computer into the container, and the first in-station collecting bus and the second in-station collecting bus are connected with the alternating current switching cabinet through corresponding wiring ports.
8. The device of claim 1, wherein the host computer is connected to the ac switch cabinet, the functional module, and the measurement module via a wireless network.
9. The apparatus according to any one of claims 1 to 8, further comprising: the display equipment is connected with the upper computer;
and the display equipment is used for displaying the test report generated by the upper computer.
10. A grid-connected testing method for a photovoltaic energy storage composite power station, which is suitable for the grid-connected testing device for the photovoltaic energy storage composite power station according to any one of claims 1 to 9, and comprises the following steps:
when a test instruction is received through the upper computer, a switch between the photovoltaic power generation system to be tested and the collecting bus in the first station is controlled to be closed, and/or a switch between the energy storage system to be tested and the collecting bus in the second station is controlled to be closed;
the upper computer is used for controlling the alternating current control cabinet to switch the circuit;
the alternating current control cabinet responds to the control of the upper computer to perform circuit switching, so that the first in-station collecting bus and/or the second in-station collecting bus are connected with a functional module, or the first in-station collecting bus and the second in-station collecting bus are connected;
executing each test item by using the functional module and generating corresponding test data;
collecting test data generated by the functional module by using a measurement module, and sending the test data to the upper computer;
the upper computer receives the test data generated by the measurement module, analyzes and calculates the test data, and generates a test report based on the analysis and calculation results.
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