CN113193582A - High-efficiency charging and discharging energy storage control method and system - Google Patents
High-efficiency charging and discharging energy storage control method and system Download PDFInfo
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- CN113193582A CN113193582A CN202110605030.5A CN202110605030A CN113193582A CN 113193582 A CN113193582 A CN 113193582A CN 202110605030 A CN202110605030 A CN 202110605030A CN 113193582 A CN113193582 A CN 113193582A
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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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- 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
- H02J2300/28—The renewable source being wind energy
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
本发明提供一种高效率充放电储能控制方法及系统，其中，方法包括：确定当前时段为低谷电价时段、平段电价时段或峰值电价时段；在当前时段为低谷电价时段时，采用电网对负载进行供电，且在储能电池满足充电要求时，对储能电池进行充电；在当前时段为平段电价时段时，采用电网对负载进行供电，负载用电量小且储能电池满足充电要求时，对储能电池进行充电，负载用电量大，则通过能量管理系统进行电量均衡；在当前时段为峰值电价时段时，储能电池符合放电要求时，采用储能电池对负载进行供电，在储能电池不能消纳时，接入电网。本发明能够对储能电池的充放电与否进行精确判断，合理控制储能电池的充放电时段，延长储能电池的使用寿命，降低成本。
The present invention provides a high-efficiency charge-discharge energy storage control method and system, wherein the method includes: determining that the current time period is a low price period, a flat power price period or a peak power price period; The load supplies power, and when the energy storage battery meets the charging requirements, the energy storage battery is charged; when the current period is the flat segment electricity price period, the power grid is used to supply power to the load, the load power consumption is small and the energy storage battery meets the charging requirements When the current period is the peak electricity price period, when the energy storage battery meets the discharge requirements, the energy storage battery is used to supply power to the load. When the energy storage battery cannot be absorbed, it is connected to the grid. The invention can accurately judge whether the energy storage battery is charged and discharged, reasonably control the charging and discharging period of the energy storage battery, prolong the service life of the energy storage battery and reduce the cost.
Description
Technical Field
The invention relates to the technical field of energy storage control, in particular to a high-efficiency charging and discharging energy storage control method and system.
Background
With the increasingly prominent social energy sources, various energy storage technologies are rapidly developed. In the existing technologies of low-voltage energy storage, high-voltage energy storage and the like, a lithium ion battery is charged mainly through a power grid system and a wind-solar power generation system, and the lithium ion battery is discharged through a load, so that the storage and the use of electric energy are realized. The design of the charging and discharging energy storage control method of the lithium ion battery directly relates to the safety and the use efficiency of the energy storage system.
However, since the battery energy storage system has a large number of energy storage batteries, and there is usually a certain difference between the power consumption of different energy storage batteries, it is difficult to balance all the energy storage batteries during charging and discharging, and the situations of battery overcharge, overdischarge or insufficient charging and discharging are likely to occur. And the battery is in the state of overcharge, overdischarge or insufficient charge and discharge for a long time, which can cause the problems of energy storage battery damage or short service life and the like.
Disclosure of Invention
In view of the above, it is necessary to provide a method and a system for controlling charge and discharge energy storage with high efficiency.
A high-efficiency charge-discharge energy storage control method comprises the following steps: determining the current time period as a valley electricity price time period, a flat electricity price time period or a peak electricity price time period; when the current time interval is the off-peak electricity price time interval, a power grid is adopted to supply power to a load, and when the voltage of an energy storage battery is smaller than the charging voltage, the energy storage battery is charged through the power grid; when the current time interval is a flat electricity price time interval, a power grid is adopted to supply power to a load, if the power consumption of the load is small, the voltage of the energy storage battery is smaller than the charging voltage, and the charging support number of the battery management unit is larger than the preset charging support number, the energy storage battery is charged; if the load power consumption is large, an energy management system is adopted for balancing the power; when the current time interval is the peak electricity price time interval, when the voltage of the energy storage battery is greater than the discharge voltage and the discharge support number of the battery management unit is greater than the preset discharge support number, the energy storage battery is adopted to supply power to a load; when the energy storage battery can not be consumed, the load is connected to the power grid through the energy storage bidirectional converter, and the power is supplied to the load through the power grid.
Further, after the determining that the current time period is the valley power rate time period, the flat power rate time period or the peak power rate time period, the method further includes: when the current time interval is any one of a valley electricity price time interval, a flat electricity price time interval or a peak electricity price time interval, determining whether the photovoltaic power generation system can normally operate, and if the photovoltaic power generation system can normally operate, starting the photovoltaic power generation system to supply power; when the photovoltaic power generation system has surplus power, charging an energy storage battery through the surplus power; when the power generation power of the photovoltaic power generation system is insufficient, an energy storage battery is adopted for auxiliary power supply; and if the simultaneous working power of the photovoltaic power generation system and the energy storage battery is still insufficient, the photovoltaic power generation system and the energy storage battery are connected to a power grid.
Further, when the voltage of the energy storage battery is less than the charging voltage and the charging support number of the battery management unit is greater than the preset charging support number, the energy storage battery is charged, which specifically includes: detecting that the voltage of the energy storage battery is smaller than the charging voltage; extracting a preset charging support number, and judging the relationship between the charging support number of the battery management unit and the preset charging support number; if the charging support number is larger than the preset charging support number, controlling the energy storage battery to charge; and if the charging support number is smaller than the preset charging support number, controlling the energy storage battery not to be charged.
Further, when the voltage of the energy storage battery is greater than the discharging voltage and the discharging support number of the battery management unit is greater than the preset discharging support number, the energy storage battery is adopted to supply power to the load, and the method specifically includes: detecting that the voltage of the energy storage battery is greater than the discharge voltage; extracting a preset discharge support number, and judging the relationship between the discharge support number of the battery management unit and the preset discharge support number; if the discharge support number is larger than the preset discharge support number, controlling the energy storage battery to discharge and supplying power to a load; and if the discharge support number is smaller than the preset discharge support number, accessing the load into the power grid.
Further, after determining the relationship between the charge/discharge support count of the battery management unit and the preset charge/discharge support count, before controlling the energy storage battery to perform charge/discharge if the charge/discharge support count is greater than the preset charge/discharge support count, the method further includes: detecting a total pressure difference between the maximum total pressure and the minimum total pressure of a battery cluster, wherein the battery cluster consists of an energy storage battery and a battery management unit; judging whether the total pressure difference is smaller than the maximum total pressure difference allowed for attraction of the battery cluster; if the total pressure difference is smaller than the maximum total pressure difference, closing the relay, and enabling the energy storage battery to enter a pre-charging equalization process; and if the total pressure difference is greater than the maximum total pressure difference, starting an alarm module, sending fault information with large total pressure difference, closing a fault battery cluster or starting a maintenance mode, and performing voltage equalization on the battery cluster.
Further, if the total pressure difference is smaller than the maximum total pressure difference, closing the relay, and before the energy storage battery enters a pre-charge equalization process, the method further includes: and pre-charging a capacitor in a high-voltage system connected with the battery cluster.
A high efficiency charge-discharge energy storage control system comprising: the system comprises a communication front-end processor, an electricity price monitoring module, an energy management system, an energy storage battery system, a battery management system and an energy storage bidirectional converter; the communication front-end processor, the energy storage battery system and the energy storage bidirectional converter are all connected with the energy management system; the electricity price monitoring module is connected with the communication front-end processor and is used for monitoring the current time interval in the valley electricity price time interval, the flat electricity price time interval or the peak electricity price time interval; the energy management system is used for coordinating and distributing the electric energy of the energy storage battery system and the electric power grid and determining the charging and discharging time period of the energy storage battery system; the energy storage battery system is provided with a charging and discharging detection module and a plurality of battery modules, each battery module comprises a plurality of energy storage batteries, and each energy storage battery is connected with a battery management unit and corresponds to the battery management unit one by one; the charging and discharging detection module is connected with the battery module and used for detecting the voltage of the energy storage battery and the charging and discharging support number of the battery management unit; the battery management system is connected with the communication front-end processor and the energy storage battery system and is used for detecting the state information of the energy storage battery; the energy storage bidirectional converter is used for adjusting power supply of a power grid and an energy storage battery.
Further, still include: and the photovoltaic power generation system is connected with the energy management system and the energy storage battery system and used for photovoltaic power generation, and the generated electric quantity is used for supplying power to a load or charging the energy storage battery.
Furthermore, the energy storage battery system is provided with a plurality of groups, and the energy storage battery system is connected with the energy storage bidirectional converter, the battery management system and the energy management system.
Further, the energy storage battery system comprises: the system comprises a battery control management module, a circuit breaker, a fuse, a direct current contactor, a group end insulation detection module and a battery cluster; the battery control management module is connected with the direct current contactor, the group end insulation detection module and the battery management system; the circuit breaker is connected with the fuse and the energy storage bidirectional converter; the direct current contactor is connected with the fuse and the battery cluster; the battery cluster is provided with a plurality of battery modules, and the battery modules are provided with battery monitoring units in one-to-one correspondence; the battery monitoring unit is connected with the battery control management module.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the invention can accurately judge whether the energy storage battery is charged or discharged or not when the energy storage battery is charged or discharged, and determine the current electric quantity state of the energy storage battery, thereby reasonably controlling the charging and discharging of the battery, prolonging the service life of the energy storage battery and reducing the production cost.
2. The invention can reasonably distribute and use the electric energy in the low-valley electricity price time period, the flat-section electricity price time period or the peak electricity price time period, determine the optimal peak-valley flat charging and discharging strategy and realize better economy.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for controlling high efficiency charging and discharging energy storage according to an embodiment;
FIG. 2 is a schematic diagram of an exemplary high efficiency charging and discharging energy storage control system;
fig. 3 is a topology diagram of a high efficiency charging and discharging energy storage control system in an embodiment.
Detailed Description
In order that the invention may be more clearly understood, the following detailed description of the invention is given with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a high-efficiency charge-discharge energy storage control method is provided, which includes the following steps:
step S101, determining that the current time interval is a valley power price time interval, a flat power price time interval or a peak power price time interval.
Specifically, there are a valley electricity rate period, a flat electricity rate period, and a peak electricity rate period, since the electricity rate is adjusted correspondingly as the amount of electricity used varies during a day. According to the relation between the electricity prices and the time in the historical database, the electricity prices in the current time period can be estimated, and the current time period is determined to be a valley electricity price time period, a flat electricity price time period or a peak electricity price time period, so that the corresponding energy adjustment is carried out, and the purposes of saving resources and reducing cost are achieved.
And S102, when the current time interval is the low-ebb electricity price time interval, supplying power to the load by adopting the power grid, and when the voltage of the energy storage battery is smaller than the charging voltage, charging the energy storage battery through the power grid.
Specifically, when the current time interval is detected to be the off-peak electricity price time interval, the load is connected into the power grid, the load is powered through the power grid, and the energy storage battery is charged through the power grid when the voltage of the energy storage battery is smaller than the charging voltage, namely the voltage of the energy storage battery is insufficient. The stored electric quantity can be used for controlling the energy storage battery to discharge to supply power to the load when the peak electricity price is in the period, so that the effect of reducing the cost is achieved.
Step S103, when the current time interval is a flat electricity price time interval, a power grid is adopted to supply power to a load, and if the power consumption of the load is small, the voltage of the energy storage battery is smaller than the charging voltage, and the charging support number of the battery management unit is larger than the preset charging support number, the energy storage battery is charged; and if the load power consumption is large, the energy management system is adopted for balancing the power.
Specifically, when the current time interval is detected to be the flat electricity price time interval, the power grid can be adopted to supply power to the load; when the load power consumption is small, the voltage of the energy storage battery is smaller than the charging voltage, namely the voltage of the energy storage battery is insufficient, and the charging support number of the battery management unit is larger than the preset charging support number, the energy storage battery is powered; when the load power consumption is large, the energy management system can be adopted to balance the power consumption, so that the power consumption safety is ensured.
When the battery data volume is larger than the preset charging support number, namely the electric quantity of the energy storage battery pack is insufficient, the energy storage battery is charged. And when the electric quantity of the energy storage battery pack is saturated and the charging support number is smaller than the preset charging support number, the charging of the energy storage battery is limited.
Step S104, when the current time interval is the peak electricity price time interval, and the voltage of the energy storage battery is greater than the discharge voltage, and the discharge support number of the battery management unit is greater than the preset discharge support number, the energy storage battery is adopted to supply power to a load; when the energy storage battery can not be consumed, the load is connected to the power grid through the energy storage bidirectional converter, and the power is supplied to the load through the power grid.
Specifically, when the current time interval is the peak electricity price time interval, the voltage of the energy storage battery is greater than the discharge voltage, and the discharge support number of the battery management unit is greater than the preset discharge support number, the energy storage battery is adopted to supply power to the load; when the energy storage battery can not be consumed, namely the energy storage battery can not load the load, the load is connected into a power grid through the energy storage bidirectional converter, and the power is supplied to the load through the power grid, so that the normal operation of the load is ensured.
The discharging support number is the number of batteries with the voltage of the current energy storage battery larger than the discharging voltage, and when the number of the batteries is larger than the preset discharging support number, namely the electric quantity of the energy storage battery pack is saturated, the energy storage battery supplies power to the load. And when the electric quantity of the energy storage battery pack is insufficient and the discharge support number is smaller than the preset discharge support number, the load is supplied with power through the power grid.
In the present embodiment, the current time period is determined to be a valley power rate time period, a flat power rate time period or a peak power rate time period; in the off-peak electricity price period, a power grid is adopted to supply power to the load, and when the voltage of the energy storage battery is smaller than the charging voltage, the energy storage battery is charged through the power grid; when the electricity price is in a flat period, a power grid is adopted to supply power to a load, and when the power consumption of the load is small, the voltage of the energy storage battery is smaller than the charging voltage, and the charging support number of the battery management unit is larger than the preset charging support number, the energy storage battery is charged; if the load power consumption is large, an energy management system is adopted for balancing to ensure the power utilization safety; when the voltage of the energy storage battery is greater than the discharge voltage and the discharge support number of the battery management unit is greater than the preset discharge support number in the peak electricity price period, the energy storage battery is adopted to supply power to the load; when the energy storage battery can not be consumed, the load is connected to a power grid through the energy storage bidirectional converter, the load is powered through the power grid, normal operation of the load is ensured, whether the energy storage battery is charged or discharged or not can be accurately judged when the energy storage battery is charged or discharged, and the electric quantity state of the current energy storage battery is determined, so that the charging and discharging of the battery are reasonably controlled, the service life of the energy storage battery is prolonged, and the production cost is reduced.
After step S101, the method further includes: when the current time interval is any one of the valley electricity price time interval, the flat electricity price time interval or the peak electricity price time interval, determining whether the photovoltaic power generation system can normally operate, and if the photovoltaic power generation system can normally operate, starting the photovoltaic power generation system to supply power; when the photovoltaic power generation system has surplus power, charging the energy storage battery through the surplus power; when the power generation power of the photovoltaic power generation system is insufficient, an energy storage battery is adopted for auxiliary power supply; and if the working power of the photovoltaic power generation system and the energy storage battery is still insufficient, the photovoltaic power generation system and the energy storage battery are connected to the power grid.
Specifically, when the current time interval is any one of the valley power rate time interval, the flat power rate time interval or the peak power rate time interval, the load can be further supplied with power through the photovoltaic power generation system.
When the load is powered by the photovoltaic power generation system, whether the current photovoltaic system can normally operate is determined, and if the current photovoltaic system can normally operate, the photovoltaic power generation system is started to supply power; when residual power exists after the load of the photovoltaic power generation system, the energy storage battery is charged through the residual power; if the power generation power of the photovoltaic power generation system is insufficient, starting an energy storage battery to discharge, and performing auxiliary power supply on a load; when the working power of the photovoltaic power generation system and the energy storage battery is still insufficient, the load is connected into the power grid, and at the moment, the electric power generated by the photovoltaic power generation system can be only used for charging the energy storage battery, so that the energy can be saved.
Wherein, when the voltage of energy storage battery is less than charging voltage, and the support number of charging of battery management unit is greater than and predetermines the support number of charging, charge energy storage battery, specifically include: detecting that the voltage of the energy storage battery is smaller than the charging voltage; extracting a preset charging support number, and judging the relationship between the charging support number of the battery management unit and the preset charging support number; if the charging support number is larger than the preset charging support number, controlling the energy storage battery to charge; and if the charging support number is less than the preset charging support number, controlling the energy storage battery not to be charged.
Specifically, when the voltage of the energy storage battery is smaller than the charging voltage, that is, the electric quantity of the energy storage battery is insufficient, extracting a preset charging support number, and judging the relationship between the charging support number of the battery management unit and the preset charging support number; when the charging support number is larger than the preset charging support number, namely the problem that the plurality of energy storage batteries are insufficient is solved, controlling the energy storage batteries to be connected into a power grid for charging; when the charging support number is smaller than the preset charging support number, namely the electric quantity of a small amount of energy storage batteries is insufficient, the energy storage batteries are controlled not to be charged, and the low-ebb electricity price time period or the electric quantity generated by the photovoltaic power generation system can be waited for to be charged, so that the effect of saving energy is achieved.
Wherein, voltage at the energy storage battery is greater than discharge voltage, and when the support number of discharging of battery management unit is greater than predetermineeing the support number of discharging, adopt the energy storage battery to supply power to the load and be less than charge voltage at the voltage of energy storage battery, and when the support number of battery management unit is greater than predetermineeing the support number, it is right through the electric wire netting energy storage battery charges, specifically includes: detecting that the voltage of the energy storage battery is greater than the discharge voltage; extracting a preset discharge support number, and judging the relationship between the discharge support number of the battery management unit and the preset discharge support number; if the discharge support number is larger than the preset discharge support number, controlling the energy storage battery to discharge and supplying power to the load; and if the discharge support number is smaller than the preset discharge support number, accessing the load into the power grid.
Specifically, when the voltage of the energy storage battery is detected to be greater than the discharge voltage, namely the energy storage battery has sufficient electric quantity, extracting a preset discharge support number, and judging the relationship between the discharge support number of the battery management unit and the preset discharge support number; when the discharge support number is larger than the preset discharge support number, the electric quantity of the energy storage batteries is in a sufficient state, and then the load is connected to control the energy storage batteries to discharge; when the discharge support number is smaller than the preset discharge support number, namely the number of the batteries of the energy storage battery in the state of sufficient electric quantity is small, the load is connected into a power grid, the power grid is adopted to supply power to the load, and the normal operation of the load is ensured.
After determining the relationship between the charge/discharge support count of the battery management unit and the preset charge/discharge support count, if the charge/discharge support count is greater than the preset charge/discharge support count, before controlling the energy storage battery to perform charge/discharge, the method further includes: detecting the total pressure difference between the maximum total pressure and the minimum total pressure of a battery cluster, wherein the battery cluster consists of an energy storage battery and a battery management unit; judging whether the total pressure difference is smaller than the maximum total pressure difference allowed for attracting the battery pack; if the total pressure difference is smaller than the maximum total pressure difference, closing the relay, and enabling the energy storage battery to enter a pre-charging equalization process; and if the total pressure difference is greater than the maximum total pressure difference, starting the alarm module, sending fault information with large total pressure difference, closing the fault battery cluster or starting a maintenance mode, and performing voltage equalization on the battery cluster.
Specifically, before controlling the energy storage battery to charge and discharge, a total pressure difference between a maximum total pressure and a minimum total pressure of a battery cluster needs to be detected, wherein the battery cluster consists of the energy storage battery and a battery management unit; judging whether the total pressure difference is smaller than the maximum total pressure difference allowed for attracting the battery pack; when the total pressure difference is smaller than the maximum total pressure difference, the relay is closed, the pre-charging equalization process is carried out on the energy storage batteries, the electric quantity of all the energy storage batteries in the battery cluster is equalized, and the safety of the energy storage batteries is ensured; and when the total pressure difference is greater than the maximum total pressure difference, starting the alarm module, sending fault information with large total pressure difference, closing the fault battery cluster or starting a maintenance mode, and carrying out manual voltage equalization on the battery cluster.
Wherein, in same battery cluster, total pressure difference between all energy storage battery can not exceed the biggest total pressure difference of predetermineeing, and the operation that exceeds back energy storage battery may have the potential safety hazard, consequently, can close this battery cluster, and the manual work carries out the balanced intervention of energy storage battery, or starts the maintenance mode and forces the equilibrium, is less than the biggest total pressure difference at energy storage battery's total pressure difference after, just can rerun.
Wherein, if total differential is less than the biggest total differential, then closed relay, before energy storage battery gets into the balanced flow of pre-charge, still include: the method comprises the steps of pre-charging a capacitor in a high-voltage system connected with a battery cluster.
Specifically, before the relay is closed, the capacitor in the high-voltage system connected with the battery cluster is precharged, and after the precharging equalization is judged in advance, the relay can be closed, so that the problem that the contact adhesion damage occurs due to overcurrent and heat production of the relay is avoided.
Referring to fig. 2 and 3, a high efficiency charge and discharge energy storage control system 100 is provided, which includes: the system comprises a communication front-end processor 10, an electricity price monitoring module 20, an energy management system 30, an energy storage battery system 40, a battery management system 50 and an energy storage bidirectional converter 60; the communication front-end processor 10, the energy storage battery system 40 and the energy storage bidirectional converter 60 are all connected with the energy management system 30; the electricity price monitoring module 20 is connected to the communication front-end processor 10 and is configured to monitor whether the current time interval is in a valley electricity price time interval, a flat electricity price time interval or a peak electricity price time interval; the energy management system 30 is used for coordinating and distributing the electric energy of the energy storage battery system 40 and the power grid, and determining the charging and discharging time period of the energy storage battery system 40; the energy storage battery system 40 is provided with a charging and discharging detection module and a plurality of battery modules, each battery module comprises a plurality of energy storage batteries, and each energy storage battery is connected with a battery management unit and corresponds to the battery monitoring unit one by one; the charging and discharging detection module is connected with the battery module and used for detecting the voltage of the energy storage battery and the charging and discharging support number of the battery management unit; the battery management system 50 is connected with the communication front-end processor 10 and the energy storage battery system 40, and is used for detecting the state information of the energy storage battery; the energy storage bidirectional converter 60 is used to regulate the power supply of the grid and the energy storage battery.
Specifically, the communication front-end processor 10, the energy storage battery system 40 and the energy storage bidirectional converter 60 are all connected with the energy management system 30; the electricity price monitoring module 20 is connected to the communication front-end processor 10 and is configured to monitor whether the current time interval is in a valley electricity price time interval, a flat electricity price time interval or a peak electricity price time interval, so as to determine a power supply problem of a load, and the energy management system 30 is configured to coordinate distribution of electric energy of the energy storage battery system 40 and a power grid, and determine an optimal charging and discharging time interval, so as to achieve economic maximization; the energy storage battery system 40 is provided with a charging and discharging detection module and a plurality of battery modules, each battery module comprises a plurality of energy storage batteries, and each energy storage battery is connected with a battery management unit and corresponds to the battery monitoring unit one by one; the charging and discharging detection module is connected with the battery module and used for detecting the voltage of the energy storage battery and the charging and discharging support number of the battery management unit, so that whether the current energy storage battery is charged or discharged or not is accurately judged, the battery is protected, and the service life of the energy storage battery is prolonged; the battery management system 50 is connected with the communication front-end processor 10 and the energy storage battery system 40, and is used for detecting the state information of the energy storage battery; the energy storage bidirectional converter 60 is used for adjusting power supply of the power grid and the energy storage battery, and can accurately judge whether the energy storage battery is charged or discharged or not when the energy storage battery is charged or discharged, so that the electric quantity state of the current energy storage battery is determined, the charging and discharging of the battery are reasonably controlled, the service life of the energy storage battery is prolonged, and the production cost is reduced.
Specifically, the system can determine an optimized peak-valley-average charge-discharge strategy by combining a peak-valley-average daily price mechanism and the power consumption cost of the energy storage battery system 40 in the whole life cycle, so that the best economy is realized. And the energy storage battery system 40 can be subjected to charge and discharge control according to the power consumption requirement, so that the battery power management is performed in advance, and the power consumption requirement is met.
During actual design, the system is also used for monitoring the daily charge quantity, daily discharge quantity, total charge and discharge curve, BMS and PCS of the energy storage battery on line, wherein the BMS and PCS comprise data such as the number of batteries, nominal capacity of the battery, total voltage, current, highest voltage of a single battery, lowest voltage of the single battery, SOC, SOH, battery temperature, average voltage value of each group of batteries, voltage alarm information, current alarm information, temperature alarm information, working state and the like. In addition, various statistical reports including daily reports, monthly reports or annual reports can be generated in a table mode, and the method is convenient to use and flexible in format.
Wherein, still include: and the photovoltaic power generation system is connected with the energy management system 30 and the energy storage battery system 40 and is used for photovoltaic power generation, and the generated electric quantity is used for supplying power to a load or charging the energy storage battery.
Specifically, the photovoltaic power generation system can realize load power supply under the good state of light, or charge the energy storage battery, and emit electric quantity through the energy storage battery to avoid the unstable problem of electric quantity that photovoltaic power generation produced, realize the stable power supply of load.
The energy storage battery system 40 is provided with a plurality of groups, and the energy storage battery system 40 is connected with the energy management system 30, the battery management system 50 and the energy storage bidirectional converter 60.
Specifically, the energy storage battery system 40 is provided with a plurality of sets, which can be correspondingly set according to the power consumption of the load, and the energy storage battery 40 is connected with the energy management system 20, the battery management system 50 and the energy storage bidirectional converter 60, so that the charging and discharging control and monitoring of the energy storage battery are facilitated.
Wherein, energy storage battery system 40 includes: a battery control management module 41, a circuit breaker 42, a fuse 43, a direct current contactor 44, a pack end insulation detection module 45 and a battery cluster 46; the battery control management module 41 is connected with the direct current contactor 44 and the group end insulation detection module 45, and is connected with the battery management system 50; the breaker 42 is connected with the fuse 43 and the energy storage bidirectional converter 60; the dc contactor 44 is connected to the fuse 43 and the battery bank 46; the battery cluster 46 is provided with a plurality of battery modules, the battery modules are provided with battery monitoring units in one-to-one correspondence, and the battery monitoring units are connected with the battery control management module 41.
Specifically, the battery control and management module 41 is configured to control charging and discharging of the battery cluster 46, and is connected to the dc contactor 44 to control on and off of the dc contactor 44; the circuit breaker 42 and the fuse 43 both function as a circuit breaker to protect the battery module; the group end insulation detection module 45 is used for detecting whether the battery modules are insulated; the battery cluster 46 is provided with a plurality of battery modules, the battery modules are provided with battery monitoring units corresponding to one another, and the battery monitoring units are connected with the battery control management module 41 and used for monitoring the working states of the battery modules.
The battery module comprises a plurality of energy storage batteries and battery management units, the energy storage batteries and the battery management units are in one-to-one correspondence, and the battery management units are connected with the battery monitoring units and used for monitoring the working states of the energy storage batteries.
The present invention is described in further detail with reference to specific embodiments, and the specific embodiments are not to be considered as limited to the description. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
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