CN115065086B - Inversion system in energy storage equipment and control method - Google Patents
Inversion system in energy storage equipment and control method 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
- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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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- 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
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/14—Energy storage units
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Abstract
The invention discloses an inversion system and a control method in energy storage equipment, which are applied to the field of energy storage or the field of system control; the technical scheme is that the inversion system in the energy storage equipment comprises an energy storage equipment monitor, a battery management unit, an energy storage battery, a chopper, an inverter and a controller. An inversion system in energy storage equipment and a control method thereof comprise: (S1) the controller detects the pulse width of an inverter electric energy signal and calculates the error between a reference current waveform signal inside the controller and the inverter output electric energy signal; (S2) determining whether the direct current electric energy is positioned on the open-circuit voltage side or the short-circuit current side of the maximum power point on the output electric energy characteristic curve of the inverter according to the monitoring result; and (S3) controlling the output of the inverter to enable the direct current electric energy working point of the inverter to follow the maximum power point, and greatly improving the energy storage efficiency of the energy storage equipment.
Description
Technical Field
The present invention relates to the field of energy storage or system control, and more particularly to an inverter system and control method in an energy storage device.
Background
In a microgrid consisting of a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protecting device and the like, an inverter system in energy storage equipment is an indispensable component of the microgrid as one of the energy storage devices. The inversion system in the energy storage equipment is an energy storage system consisting of a bidirectional inverter and a battery pack, can effectively regulate and control power resources, balances power consumption differences around the clock and in different seasons, ensures the safety of a power grid, and is an important precondition for renewable energy application and an important means for realizing interactive management of the power grid. The inversion system in the energy storage device is suitable for various application occasions needing dynamic energy storage, converts alternating current of a power grid into direct current to be stored in the battery pack when the electric energy is abundant, realizes electric energy storage, and inverts the electric energy stored in the battery pack into the alternating current to be output to the power grid to compensate when the electric energy is not abundant.
The traditional energy storage inverter only has the energy storage function of a single energy type, and does not have the step function of energy storage balance of multiple energy types, namely, the inversion strategy of the energy storage inverter cannot be adjusted according to the running conditions among multiple energy storage of wind electric energy, light heat energy and micro-electric energy, and other devices are usually required to be additionally installed to realize the step function, so that the defect of device redundancy exists.
Disclosure of Invention
Aiming at the problems, the invention discloses an inversion system in energy storage equipment and a control method, which can perform energy storage balance among multiple energy sources and adjust the inversion strategy of the inversion system in the energy storage equipment.
In order to realize the technical effects, the invention adopts the following technical scheme:
an inversion system among energy storage equipment which characterized in that: the inversion system among energy storage device includes:
an energy storage device monitor; the monitoring system is used for monitoring the energy storage running state of the energy storage battery in real time; the energy storage device monitor adopts a W77E58 singlechip as a microcontroller to control the monitoring of the energy storage battery, collects the running state information of the energy storage battery through an SCADA (supervisory control and data acquisition) technology, and remotely monitors in an industrial monitoring occasion of the energy storage battery by utilizing a GPRS (general packet radio service) wireless network communication technology and an Internet network communication technology;
a battery management unit; the energy storage state of the energy storage battery is calculated and adaptively adjusted; the battery management unit adopts an NEA strategy to perform self-adaptive adjustment on the energy storage battery, and the method comprises the following steps:
step 1: the battery management unit works out a corresponding energy storage NEA strategy according to the requirement of an inverter system in the energy storage equipment, and the energy source function in the energy storage battery is as follows:
in the formula (1), the first and second groups of the compound,Frepresents the function of the energy source in the energy storage battery,ithe serial number of the energy storage energy information is shown,nthe total number of the stored energy source information is represented,vindicating the equilibrium velocity of the algorithmically controlled energy source, pi 1 、π 2 、π 3 Respectively represents the energy input parameters of wind electric energy, light heat energy and micro electric energy,C ge 、C gc 、C gp respectively representing wind electric energy, light heat energy and micro-electric energy functional formulas;
step 2: and (3) carrying out NEA strategy self-adaptive adjustment according to the parameters of the energy input into the model, wherein an adjustment function is expressed as:
in the formula (2), the first and second groups,Q i (s) Representing a conditioning function of the energy source in the energy storage cell,srepresenting the energy storage state of the energy storage battery along with the change of time; after the adaptive adjustment of the NEA strategy, the energy in the energy storage battery is kept stable, and the set energy storage indexes are as follows:
in the formula (3), the first and second groups,P m the set energy storage index is shown,P v the energy input index of the energy storage battery is represented,P w the index of the energy storage power is shown,trepresents the adaptation time through the NEA strategy, deltatRepresenting the time difference before and after adaptive adjustment of the NEA strategy;
and step 3: for an inverter system in the energy storage equipment which achieves balance through self-adaptive adjustment, if energy supply needs to be optimized, the supply is ensured:
in the formula (4), the first and second groups,arepresents the optimal energy supply function under the NEA strategy, deltaaIndicating a change in the energy supply under equilibrium conditions,Q 1 shows the efficiency of energy supply under the NEA strategy,q 0 which represents the initial amount of energy output,εthe NEA strategy index coefficient is shown,sindicating the energy storage state of the energy storage battery over time,a rand representing the energy supply function in an unbalanced state;
and 4, step 4: analyzing the formulated optimal energy supply NEA strategy, and determining the superiority of the formulated NEA strategy function by comparing the effective rate difference under different states, namely:
in the formula (5), ΔQIndicating the difference in the effective supply of energy,Q 2 indicating that the effective rate of energy supply is not in a balanced state, 3 indicating three energy types of wind power, light heat and micro power,σrepresenting a maximum energy supply difference threshold allowed by the energy storage battery; keeping energy balance in the energy storage battery through the battery management units in the formulas (1) to (5);
an energy storage battery; for storing energy; the energy storage battery can store wind electric energy, light heat energy and micro-electric energy;
a chopper; the direct current converter is used for converting direct current with fixed voltage value into direct current with variable voltage value; the chopper is a bidirectional chopper comprising a power switch for charging and discharging the energy storage battery such that the power switch of the bidirectional chopper used in the discharging direction has a current with a maximum allowed value different from the power switch used in the charging direction;
an inverter; the device is used for converting alternating current electric energy into fixed-frequency fixed-voltage or frequency and voltage regulating direct current electric energy; the inverter comprises three power switches, the inverter connects the energy storage battery with the direct current bus, the inverter drives the electric energy released by the alternating current network to be transmitted to the direct current bus, and the electric energy in the direct current bus reaches the energy storage battery through the chopper;
a controller; the direct current detection and the pulse width modulation are used for controlling the inverter; the controller detects an error between a reference current waveform signal and an inverter output current signal;
the energy storage device monitor is connected with the battery management unit, the energy storage battery is coupled on the battery management unit, the battery management unit is connected with the chopper in a bidirectional mode, alternating current power input by an alternating current network reaches the chopper after being modulated by the inverter, and the chopper reaches the energy storage battery through the battery management unit to store energy.
As a further technical scheme of the invention, the energy storage battery comprises a first energy storage battery and a second energy storage battery; the energy storage battery can simultaneously carry out the charging process and the discharging process of electric energy through the first energy storage battery and the second energy storage battery.
As a further technical scheme of the invention, the chopper comprises a first chopper and a second chopper; the first chopper and the second chopper respectively correspond to the first energy storage battery and the second energy storage battery, and a charging process and a discharging process.
As a further technical scheme of the invention, the chopper comprises two power switches, wherein the first power switch is of an insulated gate bipolar transistor type, and the second power switch is of a bipolar power transistor type; the inverter includes three power switches, which are of the mosfet type.
As a further technical scheme of the invention, the chopper also comprises a boost conversion stage, the boost conversion stage corresponds to a boost mode of the chopper, a switch at a node N1 of the chopper is closed in the boost mode, and electric energy flows through a diode D and a power switch K to converge a node N4 and then flows through an inductor L to reach an energy storage battery.
As a further technical scheme of the invention, the chopper also comprises a step-down conversion stage, the step-up conversion stage corresponds to a step-down mode of the chopper, a switch at a node N1 of the chopper is closed in the step-down mode, and electric energy flows through a power switch K and a converging node N3 of a diode D and then flows through an inductor L to reach an energy storage battery.
As a further technical solution of the present invention, a controller includes:
detecting direct current; the system is used for detecting the electric energy state of a direct current bus of an inverter system in the energy storage equipment; the direct current detection adopts a direct detection method, an amplifying circuit in the controller amplifies the electric energy signal, and then the electric energy signal is converted into a digital signal through an A/D conversion circuit;
pulse width modulation control; used for modulating the inverter voltage and frequency; the pulse width modulation control utilizes the digital output of the controller to modulate the width of a series of pulses to equivalently obtain the required voltage and frequency waveforms;
a working power supply; for supplying power to the controller; the working power supply is an MS-100-5 type direct current power supply and can provide 5V voltage like a controller;
an SPI bus communication interface; the controller is used for inputting or outputting an external communication signal;
the direct current detection, the pulse width modulation control, the working power supply and the SPI bus communication interface are coupled on the controller.
As a further technical scheme of the invention, the inversion system in the energy storage equipment and the control method thereof comprise the following steps:
(S1) the controller detects the pulse width of an inverter pulse sequence electric energy signal and calculates the error between a reference current waveform signal inside the controller and an inverter output electric energy signal;
(S2) determining whether the direct current electric energy is positioned on the open-circuit voltage side or the short-circuit current side of the maximum power point on the output electric energy characteristic curve of the inverter according to the monitoring result;
and (S3) controlling the output of the inverter based on the determination result so that the DC power operating point of the inverter follows the maximum power point.
As a further technical solution of the present invention, the controller increases the inverter output, moves the inverter dc power operating point to the maximum power point when it is determined that the inverter dc power operating point is located on the open circuit voltage side of the maximum power point, and decreases the inverter output, so that the inverter dc power operating point is shifted to the open circuit voltage side when it is determined that the inverter dc power operating point is located on the short circuit current side of the maximum power point.
The invention has the beneficial and positive effects that:
compared with the conventional technology, the invention can perform energy storage balance among multiple energy storage, has no advanced function of energy storage balance of multiple energy types, namely, adjusts the inversion strategy of the energy storage inverter according to the running conditions among multiple energy storage of wind electric energy, light heat energy and micro-electric energy, does not need to additionally install other equipment to realize the advanced function, and reduces the equipment requirement cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive exercise, wherein:
fig. 1 shows a general structure diagram of an inverter system in an energy storage device;
fig. 2 shows a further enlarged structural diagram of an inverter system in the energy storage device;
fig. 3 shows a flow chart of a complex control method of an inverter system in an energy storage device;
fig. 4 shows a graph of energy storage capacity versus three energy storage systems.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, it being understood that the embodiments described herein are merely illustrative and explanatory of the invention, and are not restrictive thereof;
as shown in fig. 1, an inverter system in an energy storage device includes an energy storage device monitor, a battery management unit, an energy storage battery, a chopper, an inverter, and a controller.
In a specific embodiment, the energy storage device monitor is used for monitoring the energy storage operation state of the energy storage battery in real time. The energy storage equipment monitor adopts a W77E58 singlechip as a microcontroller to control the monitoring of an energy storage battery, the W77E58 is a rapid microprocessor which is produced by Taiwan Huabang and compatible with an MCS51 series singlechip and can be programmed for multiple times, and a plurality of functions such as 32K reprogrammable flash ROM, 256 bytes of on-chip memory, 1K SRAM accessed by MOVX instruction, a programmable watchdog timer, 3 16-bit timers, 2 enhanced full-duplex serial ports, an on-chip RC oscillator, double 16-bit data pointers and the like are integrated in the rapid microprocessor. In many occasions, the system requirements can be met almost without expanding a peripheral chip, and because a newly designed microprocessor core is adopted to remove redundant clocks and storage periods, the running speed of the system is generally 1.5 to 3 times faster than that of the traditional 8051 series under the same crystal oscillator frequency according to different instruction types, and generally can be more than 2.5 times on average. In addition, because the W77E58 adopts the all-static CMOS design and can operate at a low-speed crystal oscillator frequency, compared with the ordinary 8051, if the W77E58 adopts a low-speed operating frequency, the power saving performance of the W77E58 is greatly improved under the same instruction throughput.
In a specific embodiment, the energy storage device monitor collects the operation state information of the energy storage battery through a Supervisory Control And Data Acquisition (SCADA) technology, and the SCADA technology has a wide application field And can be applied to a plurality of fields such as Data Acquisition And monitoring Control And process Control in the fields of electric power, metallurgy, petroleum, chemical engineering, gas, railways And the like. In the power system, the SCADA system is most widely applied, and the technical development is the most mature. The remote control system is important in a telemechanical system, can monitor and control on-site operating equipment to realize various functions such as data acquisition, equipment control, measurement, parameter adjustment, various signal alarms and the like, namely a known 'four remote' function. SCADA consists of many tasks, each task performing a specific function. The server located on one or more machines is responsible for data collection, data processing (e.g., span conversion, filtering, alarm checking, calculations, event logging, history storage, execution of user scripts, etc.). The servers can communicate with each other. Some systems further divide the servers individually into specialized servers such as alarm servers, logging servers, history servers, login servers, etc. The servers are logically as a unified whole but may be physically located on different machines. The classification has the advantage that various data of a plurality of servers can be uniformly managed and collaborated in a labor division manner. Remote monitoring is carried out on the occasions of industrial monitoring of the energy storage battery by utilizing a General Packet Radio Service (GPRS) wireless network communication technology and an Internet network communication technology;
in another embodiment, the battery management unit is configured to calculate and adaptively adjust the energy storage state of the energy storage battery. The battery management unit adopts a Nash Equilibrum Algorithm (NEA) strategy to carry out self-adaptive adjustment on the energy storage battery, and the method comprises the following steps:
step 1: the battery management unit works out a corresponding energy storage NEA strategy according to the requirements of an inverter system in the energy storage equipment, and the function of the energy source in the energy storage battery is as follows:
in the formula (1), the first and second groups of the compound,Frepresents the function of the energy in the energy storage battery,ithe serial number of the energy storage energy information is shown,nthe total number of the stored energy source information is represented,vindicating the equilibrium velocity, pi, of the algorithm-controlled energy source 1 、π 2 、π 3 Respectively represents the energy input parameters of wind electric energy, light heat energy and micro-electric energy,C ge 、C gc 、C gp respectively representing wind electric energy, light heat energy and micro-electric energy functional formulas;
in NEA policy, nash equilibrium is a concept of solution in game theory, which refers to a combination of policies that satisfy the following properties: any player can change his own strategy (other player strategies are not changed) under the strategy combination without increasing his own income, and nash balance can be divided into two categories: "pure policy nash equilibrium" and "hybrid policy nash equilibrium". The pure strategy is a complete definition of how the energy storage battery is to play the energy balance game. The strategy set is a set formed by pure strategies which can be executed by the energy storage battery, the mixed strategy is a strategy formed by allocating a probability to each pure strategy, and the mixed strategy allows the energy storage battery to randomly select one pure strategy. Probability calculation is needed in the hybrid strategy game balance, and because each strategy is random, optimal income can be realized when a certain probability is reached. Because the probabilities are continuous, there are an infinite number of hybrid energy strategies even though the set of strategies is limited.
Step 2: and (3) carrying out NEA strategy self-adaptive adjustment according to the parameters of the energy input into the model, wherein an adjustment function is expressed as:
in the formula (2), the first and second groups of the compound,Q i (s) Representing a conditioning function of the energy source in the energy storage cell,srepresenting the energy storage state of the energy storage battery along with the change of time; after the adaptive adjustment of the NEA strategy, the energy in the energy storage battery is kept stable, and the set energy storage indexes are as follows:
in the formula (3), the first and second groups,P m the set energy storage index is shown,P v the energy input index of the energy storage battery is represented,P w the index of the energy storage power is shown,trepresents the adaptation time through the NEA strategy, deltatRepresenting the time difference before and after adaptive adjustment of the NEA strategy;
in the NEA strategy, each pure strategy is a "degenerate" hybrid strategy, and the probability of a particular energy storage index pure strategy is 1, while the other strategies are 0. Therefore, the 'pure strategy Nash equilibrium' means that all energy storage energy types participating in the process use the pure strategy; and correspondingly 'hybrid strategy Nash equilibrium', at least one player uses the hybrid strategy. Not every game will have pure policy nash equilibrium, e.g., "money problem" only has mixed policy nash equilibrium, not pure policy nash equilibrium. However, there are still many games that have pure policy nash equilibrium. Even more, some games can have both pure and hybrid policy balances.
And 3, step 3: for an inverter system in energy storage equipment which is balanced through self-adaptive adjustment, if the optimization of energy supply needs to be guaranteed:
in the formula (4), the first and second groups of the chemical reaction are shown in the specification,arepresents the optimal energy supply function under the NEA strategy, deltaaIndicating a change in the energy supply under equilibrium conditions,Q 1 shows the efficiency of energy supply under the NEA strategy,q 0 the amount of initial energy output is indicated,εthe NEA strategy index coefficient is shown,sindicating the energy storage state of the energy storage battery over time,a rand representing the energy supply function in an unbalanced state;
in the NEA strategy, the optimal route of energy supply is the key point for balancing all types of energy by the energy storage battery, and the NEA strategy index coefficientεNamely the threshold value of the key parameter of the optimized route for energy supply is masteredεThe specific value of (1) is that the maximum quantity of energy storage output and input of the energy is known, thus being beneficial to calculating the effective energy supply difference value.
And 4, step 4: analyzing the formulated optimal energy supply NEA strategy, and determining the superiority of the formulated NEA strategy function by comparing the effective rate difference under different states, namely:
in the formula (5), ΔQWhich represents the difference in the effective supply of energy,Q 2 indicating that the effective rate of energy supply is not in a balanced state, 3 indicating three energy types of wind power, light heat and micro power,σto representA maximum energy supply difference threshold allowed by the energy storage battery; and (4) keeping energy balance in the energy storage battery through the battery management units in the formulas (1) to (5). The NEA strategy mainly forms a game situation for objects with relevance, changes among individuals can cause overall changes in the game process, and if the individuals change states, other individuals in the game cannot change, namely Nash balance is required to exist in group management. The NEA strategy can ensure that the influence on the demand side is minimum when the energy source in the energy storage system is changed, so that the energy supply efficiency is maximized. And (3) determining the effectiveness of energy supply by using the formula (4) in the algorithm, thereby ensuring the reliability of the operation of the energy storage system.
In particular embodiments, the energy storage battery is used to store energy, primarily wind electricity, photo-thermal energy, and micro-electrical energy. The chopper is used for converting direct current with a fixed voltage value into direct current with a variable voltage value. The chopper is a bidirectional chopper comprising a power switch for charging and discharging the energy storage battery, such that the power switch of the bidirectional chopper used in the discharging direction has a current with a maximum allowed value different from the power switch used in the charging direction. The inverter is used for converting the direct current electric energy into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current electric energy. The inverter comprises three power switches, the inverter connects the energy storage battery with the direct current bus, the inverter drives the electric energy released by the alternating current network to be transmitted to the direct current bus, and the electric energy in the direct current bus flows through the chopper to reach the energy storage battery. A controller; the direct current detection and the pulse width modulation are used for controlling the inverter; the controller detects an error between the reference current waveform signal and the inverter output current signal.
In a specific embodiment, the energy storage device monitor is connected with the battery management unit, the energy storage battery is coupled to the battery management unit, the battery management unit is bidirectionally connected with the chopper, the alternating current power input by the alternating current network is modulated by the inverter and then reaches the chopper, and the chopper reaches the energy storage battery through the battery management unit for energy storage. If it is desired to evaluate in greater detail the complexity and overall cost of the portion of the electrical energy storage system located downstream of the battery, it is necessary to determine the number and size of the power switches, the size of which is proportional to the current of the maximum voltage considered the same. If both inverters have no chopper, the input voltage of the inverters may vary, for example by a factor of 1.5. Then a super large factor of 1.5 should be imposed on the current. Therefore, multiple power switches are required and, in addition, two control systems, one being a relatively complex device, are required, increasing the complexity and overall cost of the electrical energy storage system. The input stream to the inverter is an alternating current supplied by an alternating current network, i.e. a current whose direction varies periodically with time, the average current during a period being zero. Unlike direct current, its direction changes over time without the direct current changing periodically. Typically, the Alternating Current (AC) waveform is sinusoidal. Alternating current can efficiently transmit power. But in practice other waveforms, such as triangular, square, are also applied. The commercial power used in life is alternating current with sine waveform.
In a specific embodiment, the energy storage battery comprises a first energy storage battery and a second energy storage battery, and the charging process and the discharging process of the electric energy are simultaneously performed through the first energy storage battery and the second energy storage battery. The chopper comprises a first chopper and a second chopper, which respectively correspond to the first energy storage battery and the second energy storage battery, and a charging process and a discharging process. Only one control system is required for the inverter. These calculations are performed with two batteries connected to a shared inverter. The number of batteries connected to the input of the shared frequency converter may very strictly be greater than two, and the number of such connections is preferably between 2 and 15, preferably between 5 and 10. The higher the number of batteries connected to the shared inverter, the more pronounced the above-mentioned deviation is generally. When the asymmetry of the charging and discharging power requirements of all batteries connected to the shared frequency converter is in the same direction, i.e. on the other hand, when all batteries have a higher charging power requirement or all batteries have a higher discharging power requirement, the previous deviation will be reduced, since only the power component gain will be present on the asymmetric bidirectional bucket, and the gain of the power element will not have a degrading effect on the shared inverter. A symmetric chopper can be used instead of a partially asymmetric chopper: nevertheless, the degraded version of the invention yields lower gains in reducing the cost and complexity of the electrical energy storage system.
In a specific embodiment, the chopper comprises two power switches, the first power switch being of the insulated gate bipolar transistor type, the second power switch being of the bipolar type; the inverter comprises three power switches, and the three power switches are of a metal oxide semiconductor field effect transistor type. Each battery is connected in parallel with other batteries sharing the inverter input, at the dc bus. Some batteries are sized for energy applications and others for power applications. Their output voltages will be unbalanced. An asymmetric bidirectional chopper, which is a reversible DC/DC converter, has different sizes in the charging direction and the discharging direction, I is inserted between each battery and a DC bus connected to the input of a shared inverter. Reversibility of the asymmetric bidirectional chopper can be achieved by using a reversible component or operating two bidirectional unidirectional choppers in parallel in opposite directions. The asymmetric bidirectional chopper is sized to accommodate the power requirements of each chain in both directions, each chain comprising a serial association of a battery and the asymmetric bidirectional chopper. For chains requiring more power in the charging direction, the power switch used to regulate the voltage in that direction is of a larger aperture than the power switch in the other direction, and vice versa, for chains requiring more power in the discharging direction.
In a specific embodiment, the chopper further comprises a boost conversion stage, the boost conversion stage corresponds to a boost mode of the chopper, a switch at a node N1 of the chopper is closed in the boost mode, and electric energy flows through a diode D and a power switch K to converge a node N4 and then flows through an inductor L to reach an energy storage battery. The wave filter also comprises a voltage reduction conversion stage, the voltage increase conversion stage corresponds to the voltage reduction mode of the wave chopper, the switch at the node N1 of the wave chopper is closed in the voltage reduction mode, and electric energy flows through the power switch K and the convergence node N3 of the diode D and then flows through the inductor L to reach the energy storage battery. The first chopper and the second chopper are both boost choppers. The use of boost chopping at the input of an experienced inverter allows the inverter to have a higher fixed voltage and therefore a reduced magnetic circuit, in particular in terms of reducing the size of the power switches. The input voltage of the shared inverter is advantageously comprised between 300 and 2000V, preferably between 400 and 1500V, more preferably between 800 and 1200V, which means a high voltage.
In particular embodiments, each battery has a management unit adapted thereto, thereby enabling adaptation to the energy or power requirements of the application and technology of the type of electrical energy storage device used. With each associated management unit, each respective asymmetric bidirectional chopper asymmetrically controls the current of its respective battery 1 or 2 in both the charging and discharging directions, according to different charging and discharging requirements.
In a specific embodiment, as shown in fig. 2, the signal flow direction of the inverter system in the energy storage device is as follows: an alternating current power signal is input through an alternating current network to an inverter. Alternating current electric energy flows into three branches through an inductor L, the three branches and a power switch are respectively gathered at nodes N6, N7 and N8, an electric energy signal is subjected to frequency modulation and voltage regulation through the three power switches and is converted into a direct current electric energy signal and reaches a direct current bus and a direct current bus node N5, the direct current bus is connected to a direct current detection interface and a pulse modulation control interface of a controller, and direct current detection and pulse modulation are carried out by the controller. The direct current signal flows into the chopper through the direct current bus and flows out of the chopper inner node N2, and the modulation is carried out through the ADC in the period. According to the requirement of the energy storage battery, the energy storage battery is finally converged at a node N1 through a circuit in a voltage reduction mode or a circuit in a voltage boosting mode, and is output to the energy storage battery through the node N1 for energy storage.
In a particular embodiment, the controller includes a dc detection, a pulse width modulation control, an operating power supply, and an SPI bus communication interface. The direct current detection method is used for detecting the electric energy state of a direct current bus of an inversion system in the energy storage device, adopts a direct detection method, amplifies an electric energy signal through an amplification circuit in a controller, and converts the electric energy signal into a digital signal through an A/D conversion circuit. Pulse width modulation control is used to modulate inverter voltage and frequency. Pulse width modulation control modulates the width of a series of pulses with the digital output of the controller to equivalently obtain the desired voltage and frequency waveforms. The working power supply is used for supplying power to the controller, is a MS-100-5 type direct current power supply and can provide 5V voltage like the controller. And the SPI bus communication interface is used for inputting or outputting external communication signals of the controller. The DC detection, the pulse width modulation control, the working power supply and the SPI bus communication interface are coupled on the controller.
In a specific embodiment, an inverter system in an energy storage device and a control method thereof include the steps of: (S1) the controller detects the pulse width of an inverter pulse sequence electric energy signal and calculates the error between a reference current waveform signal inside the controller and an inverter output electric energy signal; (S2) determining whether the direct current electric energy is positioned on the open-circuit voltage side or the short-circuit current side of the maximum power point on the output electric energy characteristic curve of the inverter according to the monitoring result; and (S3) controlling the output of the inverter based on the determination result so that the DC power operating point of the inverter follows the maximum power point. Wherein the increasing and decreasing of the inverter output is performed by increasing and decreasing the amplitude of the reference current waveform signal, respectively. The pulse width of the pulse train signal is monitored, when the change of the pulse width is substantially disappeared within a specified time, it is determined that the operating point on the output characteristic curve of the direct current power supply is located on the open circuit voltage side of the maximum power point, and when the change of the pulse width is not disappeared after the lapse of the specified time, it is determined that the operating point is located on the short circuit current side of the maximum power point, and then, based on the determination, the on/off operation of the switching element is performed by the pulse width modulation control. And when the pulse width is larger than the preset maximum allowable width, determining that the operation point is positioned on the short-circuit current side of the maximum power point. And setting an upper limit value of voltage change at the direct current electric energy working point per unit time, and comparing the upper limit value with the monitored voltage change to determine the position of the direct current electric energy working point passing through the output characteristic curve.
In a specific embodiment, the controller increases the inverter output, moves the inverter dc power operating point toward the maximum power point when it is determined that the inverter dc power operating point is located on an open-circuit voltage side of the maximum power point, and decreases the inverter output such that the inverter dc power operating point is shifted to the open-circuit voltage side when it is determined that the inverter dc power operating point is located on a short-circuit current side of the maximum power point. When the operation of increasing the output of the inverter and the operation of keeping the output of the inverter unchanged are alternately executed, monitoring the unit time change of the voltage at the working point of the direct current power supply and the error between the reference current waveform signal and the output current signal of the inverter; when the voltage at the working point of the direct-current power supply is reduced and the voltage change does not exceed the upper limit value, or when the error basically disappears in the designated time, determining that the working point of the direct-current power supply is positioned on the open-circuit voltage side of the maximum power point; and when the voltage at the direct current power working point is reduced and the voltage change exceeds the upper limit value, or when the error does not disappear after the specified time, determining that the direct current power working point is positioned on the short-circuit current side of the maximum power point.
In a specific embodiment, the invention analyzes the modernized energy storage problem, simulates the energy storage process through various efficiency values generated in the energy signal acquisition and supply, and arranges simulation data into a table form for analysis according to the recording result of the experimental process. The experimental process runs on an Intel i9 9600KF computer, a 4.0GHz CPU and a 64+128GB internal memory dual-core PC. The simulation data transmission mode WLAN 5G signal transmission is adopted, the signal transmission rate is greater than 4.5MB/s, and the arithmetic error of the algorithm program is less than 1.5%; the simulation reference objects are a scheme I (a relaxation peak regulation energy storage system) and a scheme II (a regional heat supply network energy storage model), simulation comparison is carried out in the environment, and the parameter configuration is shown in table 1:
table 1 environmental parameters and configuration software
And (5) calculating the energy efficiency according to a formula (4) and counting the data of each parameter in the experiment. And further verifying the effectiveness of the research, summarizing the experimental results into a data table, and finally displaying the data record table of the distributed energy storage system as shown in table 2.
TABLE 2 distributed energy storage system data recording sheet
The data in the table 2 are input into simulation software, the energy storage capacity of the distributed energy storage system adopted by the invention is 867.59MW, the maximum energy utilization rate reaches 88.3%, and the calculation error is 0.86%; the energy storage capacity of the relaxation peak regulation energy storage system adopted in the first scheme is 764.46MW, the maximum energy utilization rate reaches 74.6%, and the calculation error is 1.26%; the energy storage capacity of the multi-region heat supply network designed by the scheme two is 621.78MW, the maximum energy utilization rate reaches 68.1%, and the calculation error is 1.34%. Therefore, the invention has higher feasibility for designing energy storage technology.
And (4) displaying energy storage capacity bar graphs of three different schemes according to the experimental result, analyzing the capacity difference value of each system in a comparison mode, and showing the system energy storage capacity bar graph as shown in figure 4. The maximum energy storage capacity of the invention is 867.59MW; the maximum energy storage capacity of a relaxation peak regulation energy storage system adopted in the first scheme is 764.46MW; the maximum energy storage capacity of the multi-zone heat network energy storage mode designed by the scheme two is 621.78MW. The difference values of the energy storage capacity of the scheme I and the scheme II and the energy storage capacity of the invention are respectively 103.13MW and 245.81MW, so that the energy storage performance of the inversion system in the energy storage equipment of the invention is the best.
Although specific embodiments of the invention have been described herein, it will be understood by those skilled in the art that these embodiments are merely illustrative and that various omissions, substitutions and changes in the form and details of the methods and systems described above may be made by those skilled in the art without departing from the spirit and scope of the invention; for example, it is within the scope of the present invention to combine the steps of the methods described above to perform substantially the same function in substantially the same way to achieve substantially the same result; accordingly, the scope of the invention is to be limited only by the following claims.
Claims (7)
1. An inversion system among energy storage equipment which characterized in that: the inversion system among energy storage device includes:
an energy storage device monitor; the monitoring system is used for monitoring the energy storage running state of the energy storage battery in real time; the energy storage device monitor adopts a W77E58 singlechip as a microcontroller to control the monitoring of the energy storage battery, collects the running state information of the energy storage battery through an SCADA (supervisory control and data acquisition) technology, and remotely monitors in an industrial monitoring occasion of the energy storage battery by utilizing a GPRS (general packet radio service) wireless network communication technology and an Internet network communication technology;
a battery management unit; the energy storage state of the energy storage battery is calculated and adaptively adjusted; the battery management unit adopts a Nash equalization algorithm strategy to perform self-adaptive adjustment on the energy storage battery, and the method comprises the following steps:
step 1: the battery management unit works out a corresponding energy storage Nash equalization algorithm strategy according to the requirements of an inverter system in the energy storage equipment, and the function of the energy source in the energy storage battery is as follows:
in the formula (1), the acid-base catalyst,Frepresents the function of the energy source in the energy storage battery,ithe serial number of the energy storage energy information is shown,nthe total number of the stored energy source information is shown,vindicating the equilibrium velocity of the algorithmically controlled energy source, pi 1 、π 2 、π 3 Respectively representing energy input parameters of wind electric energy, light heat energy and micro electric energy;
and 2, step: and carrying out adaptive adjustment on the Nash equilibrium algorithm strategy according to the parameters of the energy input into the model, wherein the adjustment function is represented as:
in the formula (2), the reaction mixture is,Q(s) Representing a conditioning function of the energy source in the energy storage cell,srepresenting the energy storage state of the energy storage battery along with the change of time; after adaptive adjustment of the Nash equilibrium algorithm strategy, the energy in the energy storage battery is kept stable, and the set energy storage indexes are as follows:
in the formula (3), the reaction mixture is,P m indicating deviceThe energy storage index is determined according to the energy storage index,P v the energy input index of the energy storage battery is represented,P w the index of the energy storage power is shown,trepresents the adaptive time adjustment through the Nash equilibrium algorithm strategytRepresenting the time difference before and after adaptive adjustment of the Nash equilibrium algorithm strategy;
and 3, step 3: for an inverter system in the energy storage equipment which achieves balance through self-adaptive adjustment, if energy supply needs to be optimized, the supply is ensured:
in the formula (4), the reaction mixture is,arepresents the optimal energy supply function under the strategy of Nash equilibrium algorithm, deltaaIndicating a change in the energy supply under equilibrium conditions,Q 1 represents the efficiency of energy supply under the strategy of the Nash equilibrium algorithm,q 0 the amount of initial energy output is indicated,εrepresenting the strategy index coefficient of the Nash equilibrium algorithm,sindicating the energy storage state of the energy storage battery over time,a rand representing the energy supply function in an unbalanced state;
and 4, step 4: analyzing the formulated optimal energy supply Nash equilibrium algorithm strategy, and determining the superiority of the formulated strategy function of the Nash equilibrium algorithm by comparing the effective rate difference under different states, namely:
in the formula (5), ΔQWhich represents the difference in the effective supply of energy,Q 2 the efficiency of energy supply indicating that the state of equilibrium is not reached,
1 represents wind power, 2 represents light heat energy, and 3 represents micro power;σrepresenting a maximum energy supply difference threshold allowed by the energy storage battery; keeping energy balance in the energy storage battery through battery management units in formulas (1) - (5);
an energy storage battery; for storing energy; the energy storage battery can store wind electric energy, light heat energy and micro-electric energy;
a chopper; the direct current converter is used for converting direct current with fixed voltage value into direct current with variable voltage value; the chopper is a bidirectional chopper comprising a power switch for charging and discharging the energy storage battery such that the power switch of the bidirectional chopper used in the discharging direction has a current with a maximum allowed value different from the power switch used in the charging direction;
an inverter; the device is used for converting the direct current electric energy into fixed-frequency fixed-voltage or frequency-modulation voltage-regulation alternating current electric energy; the inverter comprises three power switches, the inverter connects the energy storage battery with the direct current bus, the inverter drives the electric energy released by the alternating current network to be transmitted to the direct current bus, and the electric energy in the direct current bus reaches the energy storage battery through the chopper;
a controller; the direct current detection and the pulse width modulation are used for controlling the inverter; the controller detects an error between the reference current waveform signal and the inverter output current signal;
the energy storage device monitor is connected with the battery management unit, the energy storage battery is coupled on the battery management unit, the battery management unit is connected with the chopper in a bidirectional mode, alternating current power input by an alternating current network reaches the chopper after being modulated by the inverter, and the chopper reaches the energy storage battery through the battery management unit to store energy.
2. The inverter system in the energy storage device according to claim 1, wherein: the energy storage battery comprises a first energy storage battery and a second energy storage battery; the energy storage battery simultaneously performs a charging process and a discharging process of electric energy through the first energy storage battery and the second energy storage battery.
3. The inverter system in the energy storage device according to claim 1, wherein: the chopper comprises a first chopper and a second chopper; the first chopper and the second chopper correspond to the first energy storage battery and the second energy storage battery respectively, and the first chopper and the second chopper realize a charging process and a discharging process.
4. The inverter system in the energy storage device according to claim 1, wherein: the chopper comprises two power switches, wherein the first power switch is an insulated gate bipolar transistor type, and the second power switch is a bipolar power transistor type; the inverter includes three power switches, which are of the mosfet type.
5. The inverter system in the energy storage device according to claim 1, wherein: the controller includes:
detecting direct current; the system is used for detecting the electric energy state of a direct current bus of an inverter system in the energy storage equipment; the direct current detection adopts a direct detection method, an amplifying circuit in the controller amplifies the electric energy signal, and an A/D conversion circuit converts the electric energy signal into a digital signal;
pulse width modulation control; used for modulating the inverter voltage and frequency; the pulse width modulation control utilizes the digital output of the controller to modulate the width of a series of pulses to equivalently obtain the required voltage and frequency waveforms;
a working power supply; for supplying power to the controller; the working power supply is an MS-100-5 type direct current power supply and can provide 5V voltage for the controller;
an SPI bus communication interface; the controller is used for inputting or outputting external communication signals;
the DC detection, the pulse width modulation control, the working power supply and the SPI bus communication interface are coupled on the controller.
6. An inversion method for energy storage by an inversion system in the energy storage device according to any one of claims 1 to 5, wherein: the method comprises the following steps:
(S1) the controller detects the pulse width of an inverter pulse sequence electric energy signal and calculates the error between a reference current waveform signal inside the controller and an inverter output electric energy signal;
(S2) determining whether the direct current electric energy is positioned on the open-circuit voltage side or the short-circuit current side of the maximum power point on the output electric energy characteristic curve of the inverter according to the monitoring result;
and (S3) controlling the output of the inverter based on the determination result so that the DC power operating point of the inverter follows the maximum power point.
7. The inversion method according to claim 6, wherein: and when the direct current electric energy working point of the inverter is determined to be positioned on the open-circuit voltage side of the maximum power point, the direct current electric energy working point of the inverter is moved to the maximum power point, and the output of the inverter is reduced, so that when the direct current electric energy working point of the inverter is determined to be positioned on the short-circuit current side of the maximum power point, the direct current electric energy working point of the inverter is transferred to the open-circuit voltage side.
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