CN112271743A - Integrated charge and discharge test system and method based on modular photovoltaic power generation device - Google Patents
Integrated charge and discharge test system and method based on modular photovoltaic power generation device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention provides a system and a method for carrying out integrated charge and discharge test based on a modularized photovoltaic power generation device, which comprises the following steps: the main controller module executes preset control logic and cooperates with the upper computer to carry out charging and discharging operations; the relay switch module is controlled by the main controller module to realize the on and off of the charging and discharging circuit; the programmable direct-current power supply module is controlled by the main controller module and used for simulating photovoltaic power generation characteristics as direct-current input in the charging operation process; the power analysis and grid connection test module is a main controller module for controlling the power analysis and grid connection test module, and realizes simulation test of the quality of the inverted alternating current output electric energy, various operation conditions of a power grid and load characteristics in the discharging operation process; the main control computer has the functions of monitoring, operating and displaying of the integrated platform. The invention carries out the reliable stability test of the light storage and charging device by simulating the most real working condition.
Description
Technical Field
The invention relates to the field of new energy, in particular to a light storage and charging testing device, and more particularly to a system and a method for carrying out integrated charging and discharging testing based on a modularized photovoltaic power generation device.
Background
With the national emphasis on industries or fields such as new energy, smart energy, energy storage and the like, the industries are rapidly developed in recent years, distributed power generation based on new energy such as photovoltaic and wind power is concerned more and more in the field of power industry, however, due to the regional limitation of wind power, the economy of small-area use in most non-northwest areas in China is poor, and therefore, the light storage system is mainly used inland.
Most of grid-connected light storage devices are generally composed of an energy storage module, a photovoltaic charging module, an inverter output module and a mains supply charging module, and the whole functional interface covers a mains supply charging interface, a photovoltaic (direct current) charging interface, a direct current output interface, an inverter alternating current output interface, a communication interface and the like. In order to ensure the stable and reliable work of the grid-connected type optical storage and charging device, the reliability verification of the whole charging and discharging function and the stability assessment of various indexes are required, the existing test modes aiming at photovoltaic input, inversion output, grid-connected stability and the like are too dispersed and rough, the equipment is too dispersed, the operation of completing the whole reliability test is complex, and meanwhile, the test equipment with different types cannot meet all the reliability test requirements easily, so that in the current large environment, along with the explosive development of the energy storage industry, an integrated reliability test system aiming at the optical storage and charging device is one of urgent requirements.
Patent document CN105572502B (application number: 201510955542.9) discloses a charging and discharging integrated detection device for a super capacitor for energy storage, and relates to the field of battery detection. The device meets the requirements of the supercapacitor charge-discharge integrated detection device for energy storage, which has the advantages of large measurement range, high measurement accuracy, good stability, high speed and convenience in use. The charging detection and the discharging detection of the super capacitor for energy storage are realized through the charging circuit, the constant-current discharging circuit and the constant-voltage discharging circuit. The charging circuit charges the super capacitor for energy storage through a direct current reference source and a feedback regulation process; meanwhile, the charging quantity can be monitored in real time, and the charging circuit can be conveniently and timely adjusted. The constant-current discharge circuit and the constant-voltage discharge circuit are used as loads to discharge the super capacitor for energy storage.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system and a method for carrying out integrated charge and discharge test on a modularized photovoltaic power generation device.
The invention provides an integrated charging and discharging test system based on a modularized photovoltaic power generation device, which comprises: the system comprises a main controller module, a relay switch module, a programmable direct current power supply module, a power analysis and grid-connected test module, an industrial personal computer and a grid-connected optical storage charging power generation device;
the grid-connected optical storage charging and transmitting device is connected with the main controller module;
the relay switch module is connected with the main controller module;
the programmable direct current power supply module is connected with the main controller module;
the mains supply is connected with the main controller module;
the power analysis and grid connection test module is connected with the main controller module;
the industrial personal computer is connected with the main controller module.
The main controller module executes preset control logic and cooperates with the upper computer to carry out charging and discharging operations;
the relay switch module is controlled by the main controller module to realize the on and off of the charging and discharging circuit;
the programmable direct-current power supply module is controlled by the main controller module and used for simulating photovoltaic power generation characteristics as direct-current input in the charging operation process;
the power analysis and grid connection test module is a main controller module for controlling the power analysis and grid connection test module, and realizes simulation test of the quality of the inverted alternating current output electric energy, various operation conditions of a power grid and load characteristics in the discharging operation process;
the main control computer has the functions of monitoring, operating and displaying of the integrated platform.
Preferably, the programmable dc power supply module is connected to the main controller module through a photovoltaic input interface.
Preferably, the mains supply is connected with a mains supply input interface, and the mains supply input interface is connected with the main controller module.
Preferably, the industrial personal computer is connected with the main controller module through an Ethernet.
Preferably, the main controller module performs functionality expansion through a data conversion port; the functional expansion comprises the matched use of a current divider, a voltmeter and/or an oscilloscope through a data conversion port.
Preferably, the relay switch module comprises a direct current relay, an air switch, an alternating current contactor and/or a vacuum circuit breaker, and is operated in a small-control-large mode.
Preferably, the programmable dc power supply module includes a photovoltaic characteristic dc input mode, a constant current floating charge mode and a constant voltage down-flow mode;
the photovoltaic characteristic direct current input mode can set an open circuit voltage parameter, a short circuit current parameter, a maximum power point voltage parameter and a maximum power point current parameter.
Preferably, the quality of the electric energy in the power analysis and grid connection test module comprises adjustable voltage, current, active power, reactive power, frequency, power factor, voltage/frequency regulation rate, voltage/frequency fluctuation rate, voltage waveform sine distortion rate and voltage setting range;
the various operating conditions of the power grid comprise: voltage deviation, frequency deviation, harmonics, voltage fluctuations and flicker, and/or low voltage ride through;
the load characteristic comprises an adjustable power factor.
Preferably, the master control computer monitors voltage, current, power, frequency, time, capacity, energy, temperature, electric energy quality, power grid simulation working conditions and various load characteristics in the charging and discharging process through the master control module.
Preferably, the method further comprises the following steps: and configuring the modular photovoltaic power generation devices in different voltage test ranges according to different test alternating current/direct current voltage ranges.
According to the integrated charging and discharging test method based on the modularized photovoltaic power generation device, the integrated charging and discharging test system based on the modularized photovoltaic power generation device executes the following steps: the method for carrying out integrated charging and discharging test based on the modularized photovoltaic power generation device comprises a mains supply charging test control method, a direct current charging test control method, an alternating current discharging test control method and a direct current discharging test control method according to different charging and discharging test working conditions;
when the grid-connected optical storage device is used for charging test, a direct current charging test control method or a commercial power charging test control method is selected, and the relay switch module is controlled by the main controller module to complete the charging test;
when the grid-connected type optical storage device performs a discharge test, a direct current discharge test control method or an alternating current discharge test control method is selected and completed by matching the main controller module with the relay switch module.
Preferably, the commercial power charging test control method includes: when the master controller module is selected to enter an alternating current output charging mode, monitoring power parameters, current parameters and energy parameters including charging, and stopping or limiting charging when the grid-connected optical storage device reaches a charging threshold value;
the direct current charging test control method comprises the steps of setting voltage parameters and current parameters including charging when a master controller module is selected to enter a programmable direct current power supply module and enter a direct current output charging mode, and stopping or limiting charging when the grid-connected type optical storage device reaches a charging threshold value.
Preferably, the direct current discharge test control method includes collecting and monitoring discharge power quality parameters, controlling load characteristics and selecting a power grid simulation working condition when the main controller module is selected to control the power analysis and grid-connected test module to enter an alternating current discharge mode, and stopping or limiting discharge when the grid-connected light storage device reaches a discharge threshold;
the alternating current discharge test control method comprises the steps of collecting and monitoring discharge electric energy quality parameters when a main controller module is selected to control a power analysis and grid-connected test module to enter an alternating current discharge mode, controlling load characteristics and selecting a power grid simulation working condition, and stopping or limiting discharge when a grid-connected light storage device reaches a discharge threshold value.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention basically accords with the actual charging and discharging application working condition of the existing grid-connected light storage and charging device, and tests the reliability and stability of the light storage and charging device by simulating the most real working condition.
2. The platform type integrated design is adopted, the multi-working condition requirements are compatible, the testing systematicness of the grid-connected optical storage device is realized, and the testing efficiency is greatly improved;
3. the invention has the characteristics of customization and productization through integrated modular design, and can meet the test requirement of wide voltage range.
4. The charge and discharge control strategy is simple and effective, and has high engineering application value.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural diagram of an integrated charging and discharging test system for a modular photovoltaic power generation device according to the present invention;
FIG. 2 is a schematic diagram of a control module of the integrated charge and discharge test system for the modularized photovoltaic power generation device according to the present invention;
fig. 3 is a control strategy flow of the integrated charge and discharge test system for the modular photovoltaic power generation apparatus according to the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides an integrated charge and discharge test system and a control method for a modularized photovoltaic power generation device, wherein the photovoltaic power generation device consists of an energy storage module, a photovoltaic charging module, an inversion output module and a mains supply charging module, and an integral functional interface covers a mains supply charging interface, a photovoltaic (direct current) charging interface, a direct current output interface, an alternating current output interface, a communication interface and the like. The invention starts from the current standard and interface specification of the optical storage and charging device, fully considers the performance indexes of each module in various grid-connected optical storage and charging devices and the requirement of voltage frequency adaptability during grid connection, simulates the charging and discharging test working conditions of various devices and the abnormal operation working conditions of a power grid, and refers to the indexes of the charging and discharging power, voltage, electric energy quality, power grid adaptability, fault-free operation time and the like of the grid-connected optical storage and charging device for checking, thereby obviously improving the reliability and stability of the grid-connected optical storage and charging device.
Example 1
The invention provides an integrated charging and discharging test system based on a modularized photovoltaic power generation device, which comprises: the system comprises a main controller module, a relay switch module, a programmable direct current power supply module, a power analysis and grid-connected test module, an industrial personal computer and a grid-connected optical storage charging power generation device;
the grid-connected optical storage charging and transmitting device is connected with the main controller module;
the relay switch module is connected with the main controller module;
the programmable direct current power supply module is connected with the main controller module;
the mains supply is connected with the main controller module;
the power analysis and grid connection test module is connected with the main controller module;
the industrial personal computer is connected with the main controller module.
The main controller module executes preset control logic and cooperates with the upper computer to carry out charging and discharging operations;
the relay switch module is controlled by the main controller module to realize the on and off of the charging and discharging circuit;
the programmable direct-current power supply module is controlled by the main controller module and used for simulating photovoltaic power generation characteristics as direct-current input in the charging operation process;
the power analysis and grid connection test module is a main controller module for controlling the power analysis and grid connection test module, and realizes simulation test of the quality of the inverted alternating current output electric energy, various operation conditions of a power grid and load characteristics in the discharging operation process;
the main control computer has the functions of monitoring, operating and displaying of the integrated platform.
Specifically, the programmable direct current power supply module is connected with the main controller module through a photovoltaic input interface.
Specifically, the mains supply is connected with a mains supply input interface, and the mains supply input interface is connected with the main controller module.
Specifically, the industrial personal computer is connected with the main controller module through the Ethernet.
Specifically, the main controller module performs functional expansion through a data conversion port; the functional expansion comprises the matched use of a current divider, a voltmeter and/or an oscilloscope through a data conversion port.
Specifically, the relay switch module comprises a direct current relay, an air switch, an alternating current contactor and/or a vacuum circuit breaker, and is operated in a small-control-large mode.
Specifically, the programmable direct-current power supply module comprises a photovoltaic characteristic direct-current input mode, a constant-current floating charge mode and a constant-voltage current reduction mode;
the photovoltaic characteristic direct current input mode can set an open circuit voltage parameter, a short circuit current parameter, a maximum power point voltage parameter and a maximum power point current parameter.
Specifically, the quality of the electric energy in the power analysis and grid connection test module comprises adjustable voltage, current, active power, reactive power, frequency, power factor, voltage/frequency regulation rate, voltage/frequency fluctuation rate, voltage waveform sine distortion rate and voltage setting range;
the various operating conditions of the power grid comprise: voltage deviation, frequency deviation, harmonics, voltage fluctuations and flicker, and/or low voltage ride through;
the load characteristic comprises an adjustable power factor.
Specifically, the main control computer monitors voltage, current, power, frequency, time, capacity, energy, temperature, electric energy quality, power grid simulation working conditions and various load characteristics in the charging and discharging process through the main control module.
Specifically, the method further comprises the following steps: and configuring the modular photovoltaic power generation devices in different voltage test ranges according to different test alternating current/direct current voltage ranges.
According to the integrated charging and discharging test method based on the modularized photovoltaic power generation device, the integrated charging and discharging test system based on the modularized photovoltaic power generation device executes the following steps: the method for carrying out integrated charging and discharging test based on the modularized photovoltaic power generation device comprises a mains supply charging test control method, a direct current charging test control method, an alternating current discharging test control method and a direct current discharging test control method according to different charging and discharging test working conditions;
when the grid-connected optical storage device is used for charging test, a direct current charging test control method or a commercial power charging test control method is selected, and the relay switch module is controlled by the main controller module to complete the charging test;
when the grid-connected type optical storage device performs a discharge test, a direct current discharge test control method or an alternating current discharge test control method is selected and completed by matching the main controller module with the relay switch module.
Specifically, the utility power charging test control method includes: when the master controller module is selected to enter an alternating current output charging mode, monitoring power parameters, current parameters and energy parameters including charging, and stopping or limiting charging when the grid-connected optical storage device reaches a charging threshold value;
the direct current charging test control method comprises the steps of setting voltage parameters and current parameters including charging when a master controller module is selected to enter a programmable direct current power supply module and enter a direct current output charging mode, and stopping or limiting charging when the grid-connected type optical storage device reaches a charging threshold value.
Specifically, the direct current discharge test control method comprises the steps of collecting and monitoring discharge electric energy quality parameters, controlling load characteristics and selecting a power grid simulation working condition when a main controller module is selected to control a power analysis and grid-connected test module to enter an alternating current discharge mode, and stopping or limiting discharge when a grid-connected light storage device reaches a discharge threshold value;
the alternating current discharge test control method comprises the steps of collecting and monitoring discharge electric energy quality parameters when a main controller module is selected to control a power analysis and grid-connected test module to enter an alternating current discharge mode, controlling load characteristics and selecting a power grid simulation working condition, and stopping or limiting discharge when a grid-connected light storage device reaches a discharge threshold value.
Example 2
Example 2 is a modification of example 1
The invention aims to provide an integrated charge and discharge test system and a control method for a modularized photovoltaic power generation device, which give a charge and discharge control strategy starting from the index parameters of the existing grid-connected type optical storage and charge device; meanwhile, a modulation strategy of load characteristics and power grid simulation conditions is formulated according to the actual operation conditions of inversion and grid connection of the device. The invention has the greatest advantage of ensuring the authenticity and effectiveness of the reliable stability test by utilizing the charge-discharge characteristic index of the light storage and charge device to the maximum.
As shown in fig. 1, the structure of an integrated charging and discharging test system of a modularized photovoltaic power generation device is schematically shown, and the integrated platform comprises a main controller module, a relay switch module, a programmable direct current power supply module, a power analysis and grid connection test module and an industrial personal computer.
The integrated charging and discharging test system of the modularized photovoltaic power generation device can perform modularized integrated configuration in different voltage test ranges according to different test alternating current and direct current voltage ranges. The alternating voltage range is not more than 1000V a.c., and the direct voltage range is not more than 1500V d.c.;
the main controller executes a set control logic and is matched with an upper computer to carry out related charging and discharging operations; the main controller module can be used for functional expansion and can be matched with any one or a plurality of combinations of a current divider, a voltmeter, an oscilloscope and the like.
The relay switch module is connected with the main controller module to perform on-off action of a charging and discharging circuit; the relay switch module can use any one or a combination of more of a direct current relay, an air switch, an alternating current contactor, a vacuum circuit breaker and the like, and can be operated in a small and large control mode.
The programmable direct-current power supply module is connected with the main controller module and can simulate the photovoltaic power generation characteristic as direct-current input in the charging operation process; the programmable direct current power supply module is controlled by the main controller module, and has a photovoltaic direct current input mode, a constant current floating charge mode and a constant voltage drop current charge mode;
the photovoltaic characteristic direct current input mode can set parameters such as open-circuit voltage, short-circuit current, maximum power point voltage and maximum power point current parameters.
The power analysis and grid connection test module is connected with the main controller module, and can simulate and test the quality of the inverted alternating current output electric energy and various operation conditions and load characteristics of a power grid in the discharging operation process; the power quality parameters in the power analysis and grid connection test module can adjust voltage (U), current (I), active power (P), reactive power (Q), frequency (f), power factor (lambda), voltage/frequency regulation rate, voltage/frequency fluctuation rate, voltage waveform sine distortion rate, voltage setting range and the like;
the power analysis and grid connection test module is characterized in that the power analysis and grid connection test module can select any working condition such as voltage deviation, frequency deviation, harmonic waves, voltage fluctuation and flicker, low voltage ride through and the like.
The power analysis and grid-connected test module is internally provided with a load characteristic adjustable power factor (lambda);
the industrial personal computer is connected with the main controller module and has the functions of monitoring, operating and displaying of the integrated platform; the industrial personal computer monitors voltage, current, power, frequency, time, capacity, energy, temperature, electric energy quality, power grid simulation working conditions, various load characteristic simulations and the like in the charging and discharging process through the main controller module.
A control method of an integrated charge and discharge test system of a modularized photovoltaic power generation device is characterized in that the control method is different according to charge and discharge test working conditions, and comprises that when a grid-connected type light storage device is used for carrying out charge test, direct current output charging or commercial power alternating current charging can be selected and is completed by a main controller module in cooperation with a relay switch module; when the grid-connected light storage device is used for discharge testing, direct current input discharge or alternating current input discharge can be selected and completed by the main controller module and the relay switch module.
Specifically, when the system performs the mains supply charging test of the grid-connected light storage and charging device, as shown in fig. 2, the test system performs the on and off of the mains supply input through the main controller module in cooperation with the relay switch module. The mains supply input can be used by matching the main controller with any number of current dividers, electric meters, oscilloscopes and the like to monitor parameters of the charging process, such as voltage, current, power, temperature and the like.
Specifically, when the system performs a dc charging test of the grid-connected optical storage and charging device, as shown in fig. 2, the test system selects a dc source output mode by the main controller module in cooperation with the programmable dc power supply module, and turns on and off the dc input through the relay switch module.
Specifically, when the system performs a dc discharge test of the grid-connected optical storage and charging device, as shown in fig. 2, the optical storage and charging device is in a dc discharge mode, the test system performs discharge mode selection in cooperation with the load analysis and grid-connected test module, and performs on and off of dc output in cooperation with the relay switch module.
Specifically, when the system performs an ac discharge test of the grid-connected optical storage and charging device, as shown in fig. 2, the optical storage and charging device is in an ac discharge mode, the test system performs a grid operation condition simulation in cooperation with the load analysis and grid-connected test module, and performs on and off of the dc output in cooperation with the relay switch module.
A control method of an integrated charge and discharge test system of a modularized photovoltaic power generation device comprises a mains supply charge test control method, a direct current charge test control method, an alternating current discharge test control method and a direct current discharge test control method according to different charge and discharge test working conditions;
specifically, when the system performs the mains charging test of the grid-connected light storage and charging device, as shown in fig. 3,
when the main controller module monitors that charging parameters fluctuate, such as cut-off of charging (charging current is 0), over-high power, over-temperature, short circuit, reverse phase and the like, the system reports faults and stops processing. The light storage device feeds back various parameters such as charging voltage, current, frequency, average power, temperature, time, battery voltage and the like to the main controller module in real time when charging.
Specifically, when the system performs a dc charging test of the grid-connected optical storage and charging device, as shown in fig. 3, when the test system selects the dc source mode with photovoltaic characteristics, an open-circuit voltage V needs to be setocShort-circuit current IscMaximum power point voltage VmpMaximum power point current Imp. The programmable direct current power supply module feeds back various charging parameters such as charging voltage, current, power, time and the like to the main controller module in real time. When the main controller module monitors that charging parameters fluctuate, such as cut-off of charging (charging current is 0), over-high power, over-temperature, short circuit, reverse connection and the like, the system reports an alarm or a fault and stops processing.
Specifically, when the system performs a dc charging test of the grid-connected optical storage and charging device, as shown in fig. 3, when the test system selects a dc source mode of constant-current floating charging and constant-voltage dropping, a charging cutoff voltage, a charging current, and a cutoff current need to be set. The programmable direct current power supply module feeds back various charging parameters such as charging voltage, current, power, time and the like to the main controller module in real time. When the main controller module monitors that charging parameters fluctuate, such as cut-off of charging (charging current is 0), over-high power, over-temperature, short circuit, reverse connection and the like, the system reports an alarm or a fault and stops processing.
Specifically, when the system performs a dc discharge test of the grid-connected optical storage device, as shown in fig. 3, when the test system selects the constant current discharge mode, it needs to set a current I, a cutoff voltage U, and a time t. The load test module feeds back discharge current, voltage, capacity (Ah), energy (Wh), time and the like in real time, and when the main controller module monitors that discharge parameters fluctuate, such as discharge cutoff (discharge current is 0), undervoltage, over-temperature, short circuit, reverse connection and the like, the system reports an alarm or a fault and stops the machine for processing.
Specifically, when the system performs a dc discharge test of the grid-connected optical storage device, as shown in fig. 3, when the test system selects the constant resistance discharge mode, the resistance value R, the cut-off voltage U, and the time t need to be set. The load test module feeds back discharge current, voltage, capacity (Ah), energy (Wh), time and the like in real time, and when the main controller module monitors that discharge parameters fluctuate, such as discharge cutoff (discharge current is 0), undervoltage, over-temperature, short circuit, reverse connection and the like, the system reports an alarm or a fault and stops the machine for processing.
Specifically, when the system performs a dc discharge test of the grid-connected optical storage device, as shown in fig. 3, when the test system selects the constant power discharge mode, the power P, the cutoff voltage U, and the time t need to be set. The load test module feeds back discharge current, voltage, capacity (Ah), energy (Wh), time and the like in real time, and when the main controller module monitors that discharge parameters fluctuate, such as discharge cutoff (discharge current is 0), undervoltage, over-temperature, short circuit, reverse connection and the like, the system reports an alarm or a fault and stops the machine for processing.
Specifically, when the system performs a dc discharge test of the grid-connected optical storage device, as shown in fig. 3, when the test system selects the pulse discharge mode, the discharge current I, the cutoff voltage U, and the time interval need to be set. When the main controller module monitors that discharge parameters fluctuate, such as discharge cutoff (discharge current is 0), undervoltage, over-temperature, short circuit, reverse connection and the like, the system reports an alarm or a fault and stops the machine for processing.
Specifically, when the system performs an alternating current discharge test of the grid-connected optical storage and charging device, as shown in fig. 3, the power analysis collects any parameters of voltage (U), current (I), active power (P), reactive power (Q), frequency (f), power factor (λ), voltage/frequency regulation rate, voltage/frequency fluctuation rate, voltage waveform sine distortion rate, voltage setting range and the like, the load characteristic can regulate the power factor (λ), and the grid simulation working condition can be selected according to any one of working conditions such as voltage deviation, frequency deviation, harmonic wave, voltage fluctuation and flicker, low voltage ride through and the like. When the main controller module monitors that discharge parameters fluctuate, such as discharge cutoff (discharge current is 0), undervoltage, over-temperature, short circuit, reverse connection and the like, the system reports an alarm or a fault and stops the machine for processing.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. Based on modularization photovoltaic power generation device carries out integration charge-discharge test system, its characterized in that includes: the system comprises a main controller module, a relay switch module, a programmable direct current power supply module, a power analysis and grid connection test module and an industrial personal computer;
the relay switch module is connected with the main controller module;
the programmable direct current power supply module is connected with the main controller module;
the power analysis and grid connection test module is connected with the main controller module;
the industrial personal computer is connected with the main controller module;
the main controller module executes preset control logic and cooperates with the upper computer to carry out charging and discharging operations;
the relay switch module is controlled by the main controller module to realize the on and off of the charging and discharging circuit;
the programmable direct-current power supply module is controlled by the main controller module and used for simulating photovoltaic power generation characteristics as direct-current input in the charging operation process;
the power analysis and grid connection test module is a main controller module for controlling the power analysis and grid connection test module, and realizes simulation test of the quality of the inverted alternating current output electric energy, various operation conditions of a power grid and load characteristics in the discharging operation process;
the main control computer has the functions of monitoring, operating and displaying of the integrated platform.
2. The system for integrated charging and discharging test based on the modular photovoltaic power generation device according to claim 1, wherein the main controller module is functionally expanded through a data conversion port; the functional expansion comprises the matched use of a current divider, a voltmeter and/or an oscilloscope through a data conversion port.
3. The system for integrated charging and discharging test based on the modular photovoltaic power generation device according to claim 1, wherein the relay switch module comprises a direct current relay, an air switch, an alternating current contactor and/or a vacuum circuit breaker and is operated in a small-control-large mode.
4. The integrated charging and discharging test system based on the modular photovoltaic power generation device as claimed in claim 1, wherein the programmable direct current power supply module comprises a photovoltaic characteristic direct current input mode, a constant current floating charging mode and a constant voltage current reduction mode;
the photovoltaic characteristic direct current input mode can set an open circuit voltage parameter, a short circuit current parameter, a maximum power point voltage parameter and a maximum power point current parameter.
5. The system for performing integrated charging and discharging test based on the modular photovoltaic power generation device according to claim 1, wherein the quality of electric energy in the power analysis and grid connection test module comprises adjustable voltage, current, active power, reactive power, frequency, power factor, voltage/frequency regulation rate, voltage/frequency fluctuation rate, voltage waveform sine distortion rate and voltage setting range;
the various operating conditions of the power grid comprise: voltage deviation, frequency deviation, harmonics, voltage fluctuations and flicker, and/or low voltage ride through;
the load characteristic comprises an adjustable power factor.
6. The system for integrated charging and discharging test based on the modular photovoltaic power generation device according to claim 1, wherein the master controller monitors voltage, current, power, frequency, time, capacity, energy, temperature, power quality, power grid simulation working conditions and various load characteristics in the charging and discharging process through the master controller module.
7. The system for integrated charging and discharging test based on the modular photovoltaic power generation device according to claim 1, further comprising: and configuring the modular photovoltaic power generation devices in different voltage test ranges according to different test alternating current/direct current voltage ranges.
8. The method for performing integrated charge and discharge testing based on the modular photovoltaic power generation device is characterized in that the system for performing integrated charge and discharge testing based on the modular photovoltaic power generation device disclosed by any one of claims 1-7 is used for executing the following steps: the method for carrying out integrated charging and discharging test based on the modularized photovoltaic power generation device comprises a mains supply charging test control method, a direct current charging test control method, an alternating current discharging test control method and a direct current discharging test control method according to different charging and discharging test working conditions;
when the grid-connected optical storage device is used for charging test, a direct current charging test control method or a commercial power charging test control method is selected, and the relay switch module is controlled by the main controller module to complete the charging test;
when the grid-connected type optical storage device performs a discharge test, a direct current discharge test control method or an alternating current discharge test control method is selected and completed by matching the main controller module with the relay switch module.
9. The integrated charging and discharging test method based on the modular photovoltaic power generation device according to claim 8, wherein the commercial power charging test control method comprises the following steps: when the master controller module is selected to enter an alternating current output charging mode, monitoring power parameters, current parameters and energy parameters including charging, and stopping or limiting charging when the grid-connected optical storage device reaches a charging threshold value;
the direct current charging test control method comprises the steps of setting voltage parameters and current parameters including charging when a master controller module is selected to enter a programmable direct current power supply module and enter a direct current output charging mode, and stopping or limiting charging when the grid-connected type optical storage device reaches a charging threshold value.
10. The integrated charging and discharging test method based on the modular photovoltaic power generation device according to claim 8, wherein the direct current discharging test control method comprises collecting and monitoring discharging power quality parameters, controlling load characteristics and selecting a power grid simulation working condition when a main controller module is selected to control a power analysis and grid-connected test module to enter an alternating current discharging mode, and stopping or limiting discharging when a grid-connected optical storage device reaches a discharging threshold value;
the alternating current discharge test control method comprises the steps of collecting and monitoring discharge electric energy quality parameters when a main controller module is selected to control a power analysis and grid-connected test module to enter an alternating current discharge mode, controlling load characteristics and selecting a power grid simulation working condition, and stopping or limiting discharge when a grid-connected light storage device reaches a discharge threshold value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189893A (en) * | 2021-04-09 | 2021-07-30 | 国网上海市电力公司 | Real-time simulation-based controller grid-connected test system and method |
| CN116699298A (en) * | 2023-08-09 | 2023-09-05 | 西安高压电器研究院股份有限公司 | Grid-connected testing device and method for photovoltaic energy storage composite power station |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189893A (en) * | 2021-04-09 | 2021-07-30 | 国网上海市电力公司 | Real-time simulation-based controller grid-connected test system and method |
| CN116699298A (en) * | 2023-08-09 | 2023-09-05 | 西安高压电器研究院股份有限公司 | Grid-connected testing device and method for photovoltaic energy storage composite power station |
| CN116699298B (en) * | 2023-08-09 | 2023-10-20 | 西安高压电器研究院股份有限公司 | Grid-connected testing device and method for photovoltaic energy storage composite power station |
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Effective date of registration: 20231030 Address after: 2965 Dongchuan Road, Minhang District, Shanghai, 200245 Applicant after: SHANGHAI INSTITUTE OF SPACE POWER-SOURCES Applicant after: SHANGHAI AEROSPACE POWER TECHNOLOGY Co.,Ltd. Address before: 2965 Dongchuan Road, Minhang District, Shanghai, 200245 Applicant before: SHANGHAI INSTITUTE OF SPACE POWER-SOURCES Applicant before: SHANGHAI POWER ENERGY STORAGE BATTERY SYSTEM ENGINEERING TECHNOLOGY CO.,LTD. |