CN111293720B - Parallel photovoltaic energy storage system and parallel operation control method adopted by same - Google Patents
Parallel photovoltaic energy storage system and parallel operation control method adopted by same Download PDFInfo
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- CN111293720B CN111293720B CN202010170923.7A CN202010170923A CN111293720B CN 111293720 B CN111293720 B CN 111293720B CN 202010170923 A CN202010170923 A CN 202010170923A CN 111293720 B CN111293720 B CN 111293720B
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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
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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
- H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention relates to a parallel photovoltaic energy storage system, which comprises a plurality of parallel photovoltaic energy storage inverters, a plurality of groups of photovoltaic panels correspondingly connected with the photovoltaic energy storage inverters, a plurality of batteries correspondingly connected with the photovoltaic energy storage inverters, and loads connected with the photovoltaic energy storage inverters, wherein each photovoltaic energy storage inverter is connected with a power grid, and the parallel photovoltaic energy storage system further comprises an ammeter and energy management equipment. The ammeter is arranged between each photovoltaic energy storage inverter and the power grid and is used for detecting power of the power grid end. The energy management equipment is respectively in communication connection with each photovoltaic energy storage inverter and the electric meter and is used for acquiring the operation data and the configuration information of each photovoltaic energy storage inverter, summarizing and transmitting the operation data and the configuration information downwards, and enabling each photovoltaic energy storage inverter to calculate and execute the operation power parameters according to the operation data and the configuration information. The parallel photovoltaic energy storage system is simple and convenient to use and operate, high in system response speed and reasonable and stable in operation, and solves the problems of the existing parallel photovoltaic energy storage system.
Description
Technical Field
The invention belongs to the technical field of photovoltaic grid connection, and particularly relates to a parallel photovoltaic energy storage system and a parallel machine control method adopted by the parallel photovoltaic energy storage system.
Background
The installation and use of photovoltaic energy storage inverter have now become more and more common, because user's load power diverse, and the load size of user's use carries the condition and also can change always, the user can use the parallelly connected combination of many photovoltaic energy storage inverters to promote the demand of photovoltaic energy storage system capacity in order to satisfy self load.
Under the normal use condition of the photovoltaic energy storage inverter, the photovoltaic energy storage inverter needs to be connected with an intelligent ammeter to detect the load and the condition of a power grid in real time. Because the intelligent electric meter belongs to a slave machine and cannot be communicated with a plurality of photovoltaic energy storage inverters at the same time, under the condition that the plurality of photovoltaic energy storage inverters are connected in parallel, each photovoltaic energy storage inverter needs to be connected with one intelligent electric meter for use. However, such a system scheme can only be normally used under the condition that a user uses a rechargeable condition that the load power is greater than or equal to the maximum power that can be output by the photovoltaic energy storage inverters connected in parallel at the time, or the available electric power is greater than or equal to the rechargeable condition of the photovoltaic energy storage inverters connected in parallel at the time. When the load power is smaller than the maximum power which can be output by the photovoltaic energy storage inverters connected in parallel at the time and the saleable electric power is smaller than the chargeable condition of the photovoltaic energy storage inverters connected in parallel at the time, the fluctuation of the load power and the fluctuation of the solar panel power can cause the power fluctuation of the whole photovoltaic energy storage system, and the power loss caused by discharging the batteries connected by part of the photovoltaic energy storage inverters to charge the other part of the photovoltaic energy storage inverters can also occur. The reason is that each photovoltaic energy storage inverter and the connected smart electric meter cannot communicate at the same time, so that the charging and discharging actions of each photovoltaic energy storage inverter are inconsistent, and when the current charging and discharging requirements are met, a certain photovoltaic in the system still executes the instruction of the previous step to form a vicious cycle, so that the whole system cannot work normally. When a user wants to increase the capacity of the photovoltaic energy storage system, the user can only replace the photovoltaic energy storage inverter with higher power, which can meet the load requirement of the user, and reconfigure the appropriate photovoltaic panel and the battery, which causes the cost waste of the user terminal and the inconvenient use condition.
To sum up, the problem that current parallelly connected photovoltaic energy storage system exists lies in:
1. the parallel connection increases the capacity of the system, so that the system can not normally operate according to ideal conditions under most conditions;
2. when the system capacity is required to be increased, only a photovoltaic energy storage inverter with higher power can be integrally replaced, the middle power section is not available for selection, and cannot be directly connected in parallel to be increased to the power section required by a user, so that the capacity waste of a user side and the extremely inconvenient use condition are caused;
3. the battery can have different working modes, and partial battery discharge can be generated to charge other batteries under certain conditions, so that energy waste is caused.
Disclosure of Invention
The invention aims to provide a parallel photovoltaic energy storage system which can increase the system capacity through simple and convenient operation, so that the system can run more reasonably and stably.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a parallelly connected photovoltaic energy storage system, include the parallelly connected photovoltaic energy storage inverter of a plurality of commercial power, a plurality of group with photovoltaic panel, a plurality of and the photovoltaic energy storage inverter corresponds the photovoltaic panel of connecting alone, a plurality of with the photovoltaic energy storage inverter corresponds the battery of connecting alone, with each the load that photovoltaic energy storage inverter is connected, each photovoltaic energy storage inverter is connected with the electric wire netting, parallelly connected photovoltaic energy storage system still includes:
The electric meter is arranged between each photovoltaic energy storage inverter bus and the power grid and is used for detecting the power of the power grid end;
and the energy management equipment is respectively in communication connection with the photovoltaic energy storage inverters and the electric meter and is used for acquiring operation data and configuration information of the photovoltaic energy storage inverters, summarizing and issuing the operation data and the configuration information, and enabling the photovoltaic energy storage inverters to calculate and execute operation power parameters according to the operation data and the configuration information.
Preferably, the energy management device is in communication connection with each photovoltaic energy storage inverter and the electric meter through a bus respectively. The bus is an RS485 bus.
Preferably, the energy management device is also in communication connection with a remote monitoring system. The energy management device is in communication connection with the remote monitoring system through WiFi, LAN or bus mode.
Preferably, each photovoltaic energy storage inverter is further in communication connection with an independent monitoring device. Each photovoltaic energy storage inverter is in communication connection with the independent monitoring device in a WiFi, LAN and APP mode.
A parallel operation control method is applied to the parallel photovoltaic energy storage system, and comprises the following steps: in each detection period, the following steps are respectively executed:
Step 1: collecting power P of grid end detected by electric metermAnd collecting the current total active power P of each photovoltaic energy storage inverteractiveThe current charge-discharge value P of the batterycbatteryThe battery capacity P of the single photovoltaic energy storage inverterscbatteryThe residual nuclear power state Soc of each battery and the distribution amount P of each photovoltaic energy storage inverterSOCAnd accumulating to obtain the charge-discharge power P of the battery based on the residual electric quantity state Soc of each batterytcbatteryThen, step 2 is executed;
step 2: according to the power P of the grid terminalmJudging whether the parallel photovoltaic energy storage system is in a power buying state or a power selling state, if so, executing a step 3, and if so, executing a step 6;
and step 3: according to the charge-discharge power P of the batterytcbatteryJudging whether the battery is in a charging state or a discharging state, if so, executing a step 4, and if not, executing a step 5;
and 4, step 4: according to the distribution limit P of each photovoltaic energy storage inverterSOCThe power P of the grid terminalmCalculating the actual charging power of each battery and executing the charging process according to the actual charging power of each batteryA rate of PSOC*Pm；
And 5: according to the distribution limit P of each photovoltaic energy storage inverter SOCThe power P of the grid terminalmThe charge-discharge power P of the batterytcbatteryCalculating the actual discharge power of each battery and executing a discharge process according to the actual discharge power, wherein the actual discharge power of each battery is PSOC*(Ptcbattery+ Pm)；
And 6: according to the charge-discharge power P of the batterytcbatteryJudging whether the battery is in a charging state or a discharging state, if so, executing a step 7, and if not, executing a step 8;
and 7: according to the distribution limit P of each photovoltaic energy storage inverterSOCThe power P of the grid terminalmCalculating the actual charging power of each battery and executing the charging process according to the actual charging power, wherein the actual charging power of each battery is PSOC*Pm；
And 8: according to the charge-discharge power P of the batterytcbatteryAnd the grid side power PmJudging the relationship between the discharged amount of the battery and the electricity selling amount of the parallel photovoltaic energy storage system, if the discharged amount of the battery is more than the electricity selling amount of the parallel photovoltaic energy storage system, executing a step 9, and if the discharged amount of the battery is less than the electricity selling amount of the parallel photovoltaic energy storage system, executing a step 10;
and step 9: according to the distribution limit P of each photovoltaic energy storage inverterSOCThe power P of the grid terminal mThe charge-discharge power P of the batterytcbatteryCalculating the actual discharge power of each battery and executing a discharge process according to the actual discharge power, wherein the actual discharge power of each battery is PSOC*(Ptcbattery- Pm)；
Step 10: the actual discharge power of each of the batteries is set to 0.
Preferably, the detection period is 200 ms.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the parallel photovoltaic energy storage system is simple and convenient to use and operate, high in system response speed and reasonable and stable in operation, and solves the problems of the existing parallel photovoltaic energy storage system.
Drawings
Fig. 1 is a schematic diagram of a parallel photovoltaic energy storage system of the present invention.
Fig. 2 is a flowchart of a parallel operation control method adopted by the parallel photovoltaic energy storage system of the invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: as shown in fig. 1, a parallel photovoltaic energy storage system connected to a power grid includes a plurality of photovoltaic energy storage inverters, a plurality of groups of photovoltaic panels PV, a plurality of cells, and a load. The photovoltaic energy storage inverters are connected with the load through the power grid, the photovoltaic panels are connected with the photovoltaic energy storage inverters in a single corresponding mode, and the batteries are connected with the photovoltaic energy storage inverters in a single corresponding mode.
The parallel photovoltaic energy storage system also includes an intelligent electricity meter and an Energy Management System (EMS).
The ammeter is arranged between the bus connected with each photovoltaic energy storage inverter and the power grid and used for detecting the power P of the power grid endm。
The energy management equipment is respectively in communication connection with each photovoltaic energy storage inverter and the electric meter, and mainly comprises a data collector which is used for acquiring the operation data and the configuration information of each photovoltaic energy storage inverter and summarizing and transmitting the operation data and the configuration information downwards, so that each photovoltaic energy storage inverter calculates the operation power parameter according to the operation data and the configuration information transmitted by the energy management equipment and executes the operation power parameter. Wherein the operation data of the photovoltaic energy storage inverters comprises the current total active power P of each photovoltaic energy storage inverteractiveAnd the current charge-discharge value P of the corresponding battery of each photovoltaic energy storage invertercbatteryBattery capacity P of single photovoltaic energy storage inverterscbatteryResidual nuclear power states Soc of the cells, and the like, configuration of the photovoltaic energy storage inverterThe information comprises the distribution limit P of each photovoltaic energy storage inverterSOCAnd so on.
In the parallel photovoltaic energy storage system, the energy management device is in communication connection with each photovoltaic energy storage inverter and each electric meter through a bus (such as an RS485 bus). In addition, energy management equipment can also be through wiFi, LAN, or bus mode and remote monitoring system looks communication connection, and each photovoltaic energy storage inverter can also be through wiFi, LAN, APP mode and independent monitoring device looks communication connection.
In the parallel photovoltaic energy storage system, an energy management device and an independent electric meter connected with the energy management device are added. The electric meter detects energy flow at the side of the power grid, the energy management equipment acquires the operation data and the configuration information of each photovoltaic energy storage inverter through the 485 bus, so that the energy management equipment collects the relevant information of all the photovoltaic energy storage inverters and sends the relevant information in a broadcast mode, each photovoltaic energy storage inverter receives the relevant information and independently calculates correspondingly to obtain the corresponding parameters such as power generation power, charge and discharge power and the like and executes corresponding actions, and the response speed and the communication efficiency are improved through independent calculation. In addition, in order to ensure that the service life of the battery accessed by each photovoltaic energy storage inverter is kept consistent, the working modes of all the batteries in the system are the same at the same time, and the charge and discharge power is calculated according to the residual electric quantity so as to ensure that the SOC of each battery is basically consistent. Under the condition of anti-reflux, the energy management equipment broadcasts anti-reflux configuration information, and each energy storage inverter independently calculates AC power limit, so that the aim of preventing the reflux of the system is fulfilled, and the parallel response speed and stability of multiple machines are improved. In terms of system monitoring, the energy management device is also communicatively connected to a remote monitoring system via WiFi, LAN, or bus (including but not limited to 485 bus) to provide monitoring and remote operation; each photovoltaic energy storage inverter is in communication connection with the independent monitoring device through WiFi, LAN and APP, and therefore independent monitoring is achieved.
Specifically, as shown in fig. 2, the parallel operation control method adopted by the parallel photovoltaic energy storage system includes: setting a detection period (e.g. 200 ms), in each detection period, respectively executing the following steps:
step 1: collecting power P of power grid terminal detected by ammeterm(ii) a Collecting the current total active power P of each photovoltaic energy storage inverteractiveCurrent charge-discharge value P of batterycbatteryBattery capacity P of single photovoltaic energy storage inverterscbatteryThe residual nuclear power state Soc of each battery and the distribution amount P of each photovoltaic energy storage inverterSOCAnd accumulating to obtain the charge-discharge power P of the battery based on the residual electric quantity state Soc of each batterytcbatteryThen, step 2 is performed. The operation data and the configuration information of the photovoltaic energy storage inverters are acquired by the energy management equipment and then broadcast and issued to the photovoltaic energy storage inverters.
Step 2: according to the power P of the network terminalmAnd (3) judging whether the parallel photovoltaic energy storage system is in a power buying state or a power selling state, executing the step (3) if the parallel photovoltaic energy storage system is in the power buying state, and executing the step (6) if the parallel photovoltaic energy storage system is in the power selling state.
In the step, the power P of the power grid end is judgedmIf P is greater than 0mIf > 0, the system is in power-on state, if PmIf the power is greater than 0, the system is in a power selling state.
And step 3: according to the charge-discharge power P of the batterytcbatteryAnd (4) judging whether the battery is in a charging state or a discharging state, if so, executing the step (4), and if not, executing the step (5).
In this step, the charge/discharge power P of the battery is judgedtcbatteryIf P is less than 0tcbatteryIf < 0, the battery is in a charged state, if PtcbatteryIf < 0 is not true, the battery is in a discharged state.
And 4, step 4: according to the distribution limit P of each photovoltaic energy storage inverterSOCGrid side power PmCalculating the actual charging power of each battery and executing the charging process according to the actual charging power, wherein the actual charging power of each battery is PSOC*Pm。
And 5: according to the distribution limit P of each photovoltaic energy storage inverterSOCGrid side power PmAnd the charging and discharging power P of the batterytcbatteryCalculating the actual value of each cellThe actual discharge power of each battery is PSOC*(Ptcbattery+ Pm)。
Step 6: according to the charge-discharge power P of the batterytcbatteryAnd (4) judging whether the battery is in a charging state or a discharging state, executing the step (7) if the battery is in the charging state, and executing the step (8) if the battery is in the discharging state.
In this step, the charge/discharge power P of the battery is judgedtcbatteryIf P is less than 0tcbatteryIf < 0, the battery is in a charged state, if PtcbatteryIf < 0 is not true, the battery is in a discharged state.
And 7: according to the distribution limit P of each photovoltaic energy storage inverterSOCPower P of the grid terminalmCalculating the actual charging power of each battery and executing the charging process according to the actual charging power, wherein the actual charging power of each battery is PSOC*Pm。
And step 8: according to the charge-discharge power P of the batterytcbatteryAnd the power P of the grid terminalmThe relation between the discharged amount of the battery and the electricity selling amount of the parallel photovoltaic energy storage system is judged, if the discharged amount of the battery is more than the electricity selling amount of the parallel photovoltaic energy storage system, the step 9 is executed, and if the discharged amount of the battery is less than the electricity selling amount of the parallel photovoltaic energy storage system, the step 10 is executed.
In this step, the charge/discharge power P is determinedtcbatteryWhether it is greater than power P of power grid endmIf P istcbattery＞PmIf the electricity selling quantity is larger than the electricity selling quantity of the parallel photovoltaic energy storage system, and if P is larger than the electricity selling quantity of the parallel photovoltaic energy storage systemtcbattery＞PmIf the electricity consumption of the battery is not equal to the electricity consumption of the parallel photovoltaic energy storage system, the discharged electricity quantity of the battery is less than the electricity consumption of the parallel photovoltaic energy storage system.
And step 9: according to the distribution limit P of each photovoltaic energy storage inverterSOCGrid side power PmAnd the charging and discharging power P of the batterytcbatteryCalculating the actual discharge power of each battery and executing the discharge process according to the actual discharge power, wherein the actual discharge power of each battery is PSOC*(Ptcbattery- Pm)。
Step 10: the actual discharge power of each battery was set to 0.
The beneficial effect of above-mentioned scheme lies in:
1. The number of the intelligent electric meters is reduced, and only one electric meter is needed even if a plurality of photovoltaic energy storage inverters exist in the system;
2. the response speed of the system is increased, so that the photovoltaic energy storage inverter can enter a corresponding charging and discharging mode more quickly, and the energy loss caused by the response time is reduced;
3. the response rate of the system is improved, the photovoltaic energy storage inverter in the system can respond to the change of energy in the system more quickly, and the waste of electricity purchasing and PV energy of a user is reduced;
4. the service life of the battery is prolonged, and energy loss caused by energy conversion of the battery in the system is avoided.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (2)
1. A parallel operation control method is applied to a parallel photovoltaic energy storage system, the parallel photovoltaic energy storage system comprises a plurality of photovoltaic energy storage inverters with commercial power connected in parallel, a plurality of groups of photovoltaic panels connected with the photovoltaic energy storage inverters in an independent corresponding mode, a plurality of batteries connected with the photovoltaic energy storage inverters in an independent corresponding mode, and loads connected with the photovoltaic energy storage inverters, each photovoltaic energy storage inverter is connected with a power grid, and the parallel photovoltaic energy storage system further comprises:
The electric meter is arranged between each photovoltaic energy storage inverter bus and the power grid and is used for detecting the power of the power grid end;
the energy management device is in communication connection with each photovoltaic energy storage inverter and the electric meter respectively, and is used for acquiring operation data and configuration information of each photovoltaic energy storage inverter, summarizing and issuing the operation data and the configuration information, so that each photovoltaic energy storage inverter calculates operation power parameters according to the operation data and the configuration information and executes the operation power parameters, and the energy management device is characterized in that: the parallel operation control method comprises the following steps: in each detection period, the following steps are respectively executed:
step 1: collecting power P of grid end detected by electric metermAnd collecting the current total active power P of each photovoltaic energy storage inverteractiveThe current charge-discharge value P of the batterycbatteryThe battery capacity P of the single photovoltaic energy storage inverterscbatteryThe residual electric quantity state Soc of each battery and the distribution limit P of each photovoltaic energy storage inverterSOCAnd accumulating to obtain the charge-discharge power P of the battery based on the residual electric quantity state Soc of each batterytcbatteryThen, step 2 is executed;
step 2: according to the power P of the grid terminal mJudging whether the parallel photovoltaic energy storage system is in a power buying state or a power selling state, if so, executing a step 3, and if so, executing a step 6;
and 3, step 3: according to the charge-discharge power P of the batterytcbatteryJudging whether the battery is in a charging state or a discharging state, if so, executing a step 4, and if not, executing a step 5;
and 4, step 4: according to the distribution limit P of each photovoltaic energy storage inverterSOCThe power P of the grid terminalmCalculating the actual charging power of each battery and executing the charging process according to the actual charging power, wherein the actual charging power of each battery is PSOC*Pm；
And 5: according to the distribution limit P of each photovoltaic energy storage inverterSOCThe power P of the grid terminalmThe charge-discharge power P of the batterytcbatteryCalculating the actual discharge power of each battery and executing the discharge process according to the actual discharge power, wherein the actual discharge power of each battery is PSOC*(Ptcbattery+ Pm)；
Step 6: according to the batteryCharging and discharging power PtcbatteryJudging whether the battery is in a charging state or a discharging state, if so, executing a step 7, and if not, executing a step 8;
and 7: according to the distribution limit P of each photovoltaic energy storage inverter SOCThe power P of the grid terminalmCalculating the actual charging power of each battery and executing the charging process according to the actual charging power, wherein the actual charging power of each battery is PSOC*Pm；
And step 8: according to the charge-discharge power P of the batterytcbatteryAnd the grid side power PmJudging the relationship between the discharged amount of the battery and the electricity selling amount of the parallel photovoltaic energy storage system, if the discharged amount of the battery is more than the electricity selling amount of the parallel photovoltaic energy storage system, executing a step 9, and if the discharged amount of the battery is less than the electricity selling amount of the parallel photovoltaic energy storage system, executing a step 10;
and step 9: according to the distribution limit P of each photovoltaic energy storage inverterSOCThe power P of the grid terminalmThe charge-discharge power P of the batterytcbatteryCalculating the actual discharge power of each battery and executing the discharge process according to the actual discharge power, wherein the actual discharge power of each battery is PSOC*(Ptcbattery- Pm)；
Step 10: the actual discharge power of each of the batteries is set to 0.
2. The parallel machine control method according to claim 1, characterized in that: the detection period is 200 ms.
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| CN111934336A (en) * | 2020-08-20 | 2020-11-13 | 电管家集团有限公司 | Electric power energy storage control system |
| CN112803475A (en) * | 2020-12-31 | 2021-05-14 | 深圳市富兰瓦时技术有限公司 | Parallel operation control system and method for household energy storage inverter |
| CN114552663B (en) * | 2022-04-24 | 2022-08-09 | 深圳市首航新能源股份有限公司 | Parallel optical storage system and control method thereof, optical storage host and slave |
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