CN116073410A - Multi-energy-storage inverter parallel control method and system based on island operation - Google Patents
Multi-energy-storage inverter parallel control method and system based on island operation Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- 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
- H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a multi-energy-storage inverter parallel control method and system based on island operation, comprising the following steps: obtaining output power of a load and power generation of a photovoltaic array, and determining first parallel quantity of energy storage inverters; acquiring a first stored electric quantity of the energy storage inverter on the premise that the first change curve and the second change curve are unchanged based on the first change curve of the output power and the second change curve of the generated power; by predicting the generated power, controlling the second stored electric quantity of the energy storage inverter on the premise of ensuring that the output power is unchanged; by changing the output power, on the premise of ensuring that the generated power is unchanged, controlling the third storage electric quantity of the energy storage inverter; obtaining a fourth stored electric quantity of the energy storage inverter by changing the output power and the generated power; according to different stored electric quantity, the energy storage inverter is controlled, and the invention provides a new technical thought for the intelligent control technology of the multi-energy storage inverter under the island operation state of the micro-grid.
Description
Technical Field
The invention relates to the technical field of multi-energy-storage inverter parallel control, in particular to a multi-energy-storage inverter parallel control method and system based on island operation.
Background
In recent years, with the rapid progress of photovoltaic energy storage technology, especially the rapid development of energy storage inverter technology, the demand for modular design is higher and higher, the power required by the system is higher and higher, and more products start to increase the parallel operation function so as to meet the demands of high power and redundancy of modular design.
In some remote areas, a micro-grid system with energy storage inverters needs to be built to run under an island, due to the lack of grid support, the work stability of the energy storage inverters needs to be guaranteed, but a single energy storage inverter is difficult to adapt to continuous running of loads, especially in the condition of continuous bad weather, photovoltaic power generation capacity is suddenly reduced, the micro-grid cannot normally run, furthermore, parallel connection design of a plurality of energy storage inverters occurs, the problem of micro-grid running duration can be effectively solved, in a parallel connection system of the plurality of energy storage inverters, the plurality of energy storage inverters output to the same load, the output of the plurality of energy storage inverters needs to be synchronized, and the problem of running strategy control of the plurality of energy storage inverters needs to be considered.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a multi-energy-storage inverter parallel control method and system based on island operation, which realize the operation control of the multi-energy-storage inverter by analyzing the whole operation condition of the multi-energy-storage inverter.
In order to achieve the technical purpose, the application provides a multi-energy-storage inverter parallel control method based on island operation, wherein a micro-grid system consisting of a plurality of energy-storage inverters, a photovoltaic array and a load is in an island operation state, and the multi-energy-storage inverter parallel control method comprises the following steps:
obtaining output power of a load and power generation of a photovoltaic array, and determining first parallel quantity of energy storage inverters;
based on a first change curve of output power and a second change curve of generated power, respectively controlling each energy storage inverter to charge or discharge by acquiring the current running state of each energy storage inverter, and controlling the first storage electric quantity of each energy storage inverter on the premise of keeping the first change curve and the second change curve unchanged;
by predicting the generated power, controlling the second storage electric quantity of each energy storage inverter on the premise of ensuring the unchanged output power;
by changing the output power, on the premise of ensuring that the generated power is unchanged, controlling the third storage electric quantity of each energy storage inverter;
obtaining a fourth stored electric quantity of each energy storage inverter by changing the output power and the generated power;
and taking the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity as threshold values, acquiring the parallel connection quantity of the energy storage inverters according to the change conditions of the generated power and the output power, and carrying out charging or discharging control on the plurality of energy storage inverters.
Preferably, in the process of obtaining the first parallel number of the energy storage inverters, obtaining a first output current and a first charging speed of the energy storage inverters according to the output power and the generated power;
acquiring a second output current of the energy storage inverter according to the output power;
acquiring a second charging speed of the energy storage inverter according to the generated power;
and obtaining the first parallel quantity of the energy storage inverters according to the first output current, the second output current, the first charging speed and the second charging speed.
Preferably, in the process of acquiring the first stored electric quantity, acquiring the time-varying and climate-varying conditions of the output power and the generated power, and generating a first variation curve and a second variation curve;
carrying out normalization processing on the first change curve and the second change curve to obtain a first change rule of output power and power generation power based on time change and a second change rule based on climate change;
based on the first parallel quantity of the energy storage inverters, the energy storage inverters are controlled according to a first change rule and a second change rule, and the residual electric quantity of each energy storage inverter per day is used as a first storage electric quantity to meet the power consumption requirement of the load on the next day.
Preferably, in the process of obtaining the second stored electricity quantity, the generated power is predicted by obtaining the weather change condition, a third change rule of the generated power based on the weather change condition is obtained, and on the premise of not increasing the output power, the remaining electricity quantity of the energy storage inverter under the premise of the third change rule is obtained and used as the second stored electricity quantity to meet the electricity consumption requirement of the load under the weather change condition, wherein each energy storage inverter is controlled to charge or discharge according to the third change rule and the second stored electricity quantity.
Preferably, in the process of obtaining the third stored electricity quantity, based on the first parallel quantity of the energy storage inverters, the residual electricity quantity of the energy storage inverters under the premise of increasing the output power is obtained by increasing the quantity of the loads on the premise of ensuring that the generated power is unchanged, and the residual electricity quantity is used as the third stored electricity quantity to meet the electricity consumption requirement of the load with the increased quantity of the loads, wherein each energy storage inverter is controlled to charge or discharge according to the increased output power and the generated power.
Preferably, in the process of increasing the load quantity, judging whether the increased load quantity meets the first parallel quantity of the energy storage inverter or not based on the first parallel quantity of the energy storage inverter and the second change curve; if the first stored electric quantity is met, controlling each energy storage inverter according to the third stored electric quantity; if the output power and the generated power are not met, obtaining a second parallel number of the energy storage inverters based on the increased output power and the generated power;
based on the second parallel quantity, the first stored electric quantity, the second stored electric quantity and the third stored electric quantity are adjusted to meet the electricity consumption requirement of the load with the increased load quantity.
Preferably, in the process of acquiring the fourth stored electricity, based on the first factor for changing the output power, it is determined whether there is a necessary connection between the first factor and the weather change condition:
if necessary connection exists, a fourth change rule of the output power based on weather change conditions is obtained, and according to the third change rule, the residual electric quantity of the energy storage inverter on the premise that the output power is increased and the generated power is changed is obtained and used as a fourth stored electric quantity for meeting the power consumption requirement of a load on the premise that the output power and the generated power are both changed;
and if the necessary connection does not exist, acquiring a fifth change rule of the output power, and acquiring a fourth stored electric quantity according to the third change rule, wherein the fifth change rule is used for indicating the timeliness of the increase or the decrease of the load.
Preferably, in the process of acquiring the fourth stored electricity quantity according to the fourth change rule, based on the fourth change rule and the third change rule, judging whether the first parallel quantity or the second parallel quantity of the energy storage inverters meets the electricity demand of the load based on the fourth change rule, and if so, acquiring the fourth stored electricity quantity according to the fourth change rule and the third change rule; if the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are not met, the third parallel connection quantity of the energy storage inverter is obtained according to the fourth change rule and the third change rule, and based on the third parallel connection data, the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are adjusted to meet the electricity consumption requirement of the load under the condition of weather change.
Preferably, in the process of acquiring the fourth stored electricity quantity according to the fifth variation rule, based on the fifth variation rule and the third variation rule, judging whether the first parallel quantity or the second parallel quantity or the third parallel quantity of the energy storage inverter meets the electricity consumption requirement of the load based on the fifth variation rule, and if so, acquiring the fourth stored electricity quantity according to the fifth variation rule and the third variation rule;
if the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are not met, the fourth parallel connection quantity of the energy storage inverter is obtained according to the fifth change rule and the third change rule, and the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are adjusted to meet the electricity consumption requirement of the load under the condition of weather change.
The invention discloses a multi-energy-storage inverter parallel control system based on island operation, which is characterized in that a micro-grid system consisting of a plurality of energy-storage inverters, a photovoltaic array and a load is in an island operation state and is used for controlling the parallel control system of the plurality of energy-storage inverters, and the system comprises:
the parallel quantity determining module is used for determining the first parallel quantity of the energy storage inverters by acquiring the output power of the load and the power generation power of the photovoltaic array;
the first parallel selection module is used for respectively controlling each energy storage inverter to charge or discharge based on a first change curve of the output power and a second change curve of the generated power by acquiring the current running state of each energy storage inverter and controlling the first storage electric quantity of each energy storage inverter on the premise of keeping the first change curve and the second change curve unchanged;
the second parallel selection module is used for controlling the second storage electric quantity of each energy storage inverter on the premise of ensuring the unchanged output power by predicting the generated power;
the third parallel selection module is used for controlling the third storage electric quantity of each energy storage inverter by changing the output power on the premise of ensuring that the generated power is unchanged;
the fourth parallel selection module is used for obtaining fourth storage electric quantity of each energy storage inverter by changing output power and generated power;
the parallel control module is used for taking the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity as threshold values, acquiring the parallel quantity of the energy storage inverters according to the change rule of the generated power and the output power, and carrying out charging or discharging control on the plurality of energy storage inverters.
The invention discloses the following technical effects:
the invention realizes the dynamic control of a plurality of energy storage inverters, dynamically controls the energy storage inverters according to the load electricity consumption condition and the weather change condition, satisfies the healthy operation of the micro-grid in island operation, and provides a new technical thought for the intelligent control technology of the micro-grid in island operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of the steps of the method of the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
As shown in fig. 1, the invention provides a multi-energy-storage inverter parallel control method based on island operation, wherein a micro-grid system consisting of a plurality of energy-storage inverters, a photovoltaic array and a load is in an island operation state, and the multi-energy-storage inverter parallel control method comprises the following steps:
obtaining output power of a load and power generation of a photovoltaic array, and determining first parallel quantity of energy storage inverters;
based on a first change curve of output power and a second change curve of generated power, respectively controlling each energy storage inverter to charge or discharge by acquiring the current running state of each energy storage inverter, and controlling the first storage electric quantity of each energy storage inverter on the premise of keeping the first change curve and the second change curve unchanged;
by predicting the generated power, controlling the second storage electric quantity of each energy storage inverter on the premise of ensuring the unchanged output power;
by changing the output power, on the premise of ensuring that the generated power is unchanged, controlling the third storage electric quantity of each energy storage inverter;
obtaining a fourth stored electric quantity of each energy storage inverter by changing the output power and the generated power;
and taking the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity as threshold values, acquiring the parallel connection quantity of the energy storage inverters according to the change conditions of the generated power and the output power, and carrying out charging or discharging control on the plurality of energy storage inverters.
Further preferably, in the process of obtaining the first parallel number of the energy storage inverters, the invention obtains the first output current and the first charging speed of the energy storage inverters according to the output power and the generated power;
acquiring a second output current of the energy storage inverter according to the output power;
acquiring a second charging speed of the energy storage inverter according to the generated power;
and obtaining the first parallel quantity of the energy storage inverters according to the first output current, the second output current, the first charging speed and the second charging speed.
Further preferably, in the process of acquiring the first stored electric quantity, the invention generates a first change curve and a second change curve by acquiring the time-varying and climate-varying conditions of the output power and the generated power;
carrying out normalization processing on the first change curve and the second change curve to obtain a first change rule of output power and power generation power based on time change and a second change rule based on climate change;
based on the first parallel quantity of the energy storage inverters, the energy storage inverters are controlled according to a first change rule and a second change rule, and the residual electric quantity of each energy storage inverter per day is used as a first storage electric quantity to meet the power consumption requirement of the load on the next day.
Further preferably, in the process of obtaining the second stored electricity quantity, the invention predicts the generated power by obtaining the weather change condition, obtains the third change rule of the generated power based on the weather change condition, and obtains the residual electricity quantity of the energy storage inverter under the premise of the third change rule on the premise of not increasing the output power as the second stored electricity quantity, and is used for meeting the electricity consumption requirement of the load under the weather change condition, wherein each energy storage inverter is controlled to charge or discharge according to the third change rule and the second stored electricity quantity.
Further preferably, in the process of obtaining the third stored electric quantity, based on the first parallel quantity of the energy storage inverters, by increasing the quantity of the loads, on the premise of ensuring that the generated power is unchanged, the remaining electric quantity of the energy storage inverters under the premise of increasing the output power is obtained and used as the third stored electric quantity for meeting the power consumption requirement of the load with the increased quantity of the loads, wherein each energy storage inverter is controlled to charge or discharge according to the increased output power and the generated power.
Further preferably, in the process of increasing the load quantity, based on the first parallel quantity and the second variation curve of the energy storage inverter, the invention needs to judge whether the increased load quantity meets the first parallel quantity of the energy storage inverter; if the first stored electric quantity is met, controlling each energy storage inverter according to the third stored electric quantity; if the output power and the generated power are not met, obtaining a second parallel number of the energy storage inverters based on the increased output power and the generated power;
based on the second parallel quantity, the first stored electric quantity, the second stored electric quantity and the third stored electric quantity are adjusted to meet the electricity consumption requirement of the load with the increased load quantity.
Further preferably, in the process of obtaining the fourth stored electricity, based on the first factor for changing the output power, the present invention needs to determine whether there is a necessary connection between the first factor and the weather change condition: the necessary connection means that whether the change of the load is directly connected with the weather change or not is meant to be that, for example, the weather becomes cold or hot, the output power of the load becomes larger due to the increase of electric equipment such as an air conditioner and the like, so that the power supply of the load needs to be dynamically adjusted, for example, the situation that the load becomes cold or hot still is still caused, the temperature in the morning is obviously higher than the temperature in the evening, at this time, if the load is still controlled according to the cold or hot, the system is switched back and forth, therefore, the characteristic of the generated power is that the midday temperature is high, but the generated power is also high, a looser control mode is provided when the load is supplied with power and the energy storage inverter is charged, for example, photovoltaic power generation is used for supplying power to the load and the energy storage inverter simultaneously, parallel power is only performed through the energy storage inverter in the morning, the parallel power supply is also performed through obtaining the working condition of each energy storage inverter in the evening, the parallel switching is performed, the healthy operation of the energy storage inverter is ensured, the overall safe and the power is ensured to be the power grid with relatively long-term safety.
If necessary connection exists, a fourth change rule of the output power based on weather change conditions is obtained, and according to the third change rule, the residual electric quantity of the energy storage inverter on the premise that the output power is increased and the generated power is changed is obtained and used as a fourth stored electric quantity for meeting the power consumption requirement of a load on the premise that the output power and the generated power are both changed;
and if the necessary connection does not exist, acquiring a fifth change rule of the output power, and acquiring a fourth stored electric quantity according to the third change rule, wherein the fifth change rule is used for indicating the timeliness of the increase or the decrease of the load.
Further preferably, in the process of acquiring the fourth stored electricity quantity according to the fourth change rule, based on the fourth change rule and the third change rule, the invention needs to judge whether the first parallel quantity or the second parallel quantity of the energy storage inverters meets the electricity consumption requirement of the load based on the fourth change rule, and if so, the fourth stored electricity quantity is acquired according to the fourth change rule and the third change rule; if the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are not met, the third parallel connection quantity of the energy storage inverter is obtained according to the fourth change rule and the third change rule, and based on the third parallel connection data, the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are adjusted to meet the electricity consumption requirement of the load under the condition of weather change.
Further preferably, in the process of obtaining the fourth stored electricity according to the fifth variation rule, based on the fifth variation rule and the third variation rule, the method needs to judge whether the first parallel quantity or the second parallel quantity or the third parallel quantity of the energy storage inverter meets the electricity demand of the load based on the fifth variation rule, and if so, the fourth stored electricity is obtained according to the fifth variation rule and the third variation rule;
if the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are not met, the fourth parallel connection quantity of the energy storage inverter is obtained according to the fifth change rule and the third change rule, and the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are adjusted to meet the electricity consumption requirement of the load under the condition of weather change.
The invention discloses a multi-energy-storage inverter parallel control system based on island operation, which is characterized in that a micro-grid system consisting of a plurality of energy-storage inverters, a photovoltaic array and a load is in an island operation state and is used for controlling the parallel control system of the plurality of energy-storage inverters, and the system comprises:
the parallel quantity determining module is used for determining the first parallel quantity of the energy storage inverters by acquiring the output power of the load and the power generation power of the photovoltaic array;
the first parallel selection module is used for respectively controlling each energy storage inverter to charge or discharge based on a first change curve of the output power and a second change curve of the generated power by acquiring the current running state of each energy storage inverter and controlling the first storage electric quantity of each energy storage inverter on the premise of keeping the first change curve and the second change curve unchanged;
the second parallel selection module is used for controlling the second storage electric quantity of each energy storage inverter on the premise of ensuring the unchanged output power by predicting the generated power;
the third parallel selection module is used for controlling the third storage electric quantity of each energy storage inverter by changing the output power on the premise of ensuring that the generated power is unchanged;
the fourth parallel selection module is used for obtaining fourth storage electric quantity of each energy storage inverter by changing output power and generated power;
the parallel control module is used for taking the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity as threshold values, acquiring the parallel quantity of the energy storage inverters according to the change rule of the generated power and the output power, and carrying out charging or discharging control on the plurality of energy storage inverters.
The invention realizes a multi-energy-storage inverter parallel control method through a computer program, realizes an executable program in a computer program mode according to the method logic of the multi-energy-storage inverter parallel control method, and realizes the dynamic switching of the energy-storage inverter by embedding the program into a control system of a micro-grid which is composed of a plurality of energy-storage inverters connected in parallel and is in an island operation mode.
The invention also designs a multi-energy-storage inverter parallel control device which is used for bearing a multi-energy-storage inverter parallel control system, further realizing the functional logic of the multi-energy-storage inverter parallel control system, enabling the device to be used as the peripheral of the control system of the micro-grid, predicting the generated power by acquiring the weather condition and the load condition, combining the predicted generated power according to the load condition, controlling a plurality of energy-storage inverters in the micro-grid, not only determining the parallel connection quantity of the energy-storage inverters, but also ensuring that the operation strategy of the energy-storage inverters is dynamically adjusted along with the change of the micro-grid, meeting the technical transformation of the existing micro-grid, and enabling the integrated micro-grid to simultaneously control the integrated energy-storage inverters and the original energy-storage inverters by combining more energy-storage inverters, wherein the current peak value of the integrated energy-storage inverters is different for the energy-storage inverters of different models, the capacity is different, and the charging rate is different, and the energy-storage inverter is in a state of charge state corresponding to the balance of each energy-storage inverter according to the output power of a load and the power of the photovoltaic power generation assembly, and the energy-storage inverter is in a state of charge state of each parallel connection is guaranteed.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The parallel control method of the multi-energy-storage inverter based on island operation is characterized in that a micro-grid system consisting of a plurality of energy-storage inverters, a photovoltaic array and a load is in an island operation state, and the parallel control method of the plurality of energy-storage inverters comprises the following steps:
acquiring output power of the load and power generation power of the photovoltaic array, and determining first parallel quantity of the energy storage inverters;
based on a first change curve of the output power and a second change curve of the generated power, respectively controlling each energy storage inverter to charge or discharge by acquiring the current running state of each energy storage inverter, and controlling a first storage electric quantity of each energy storage inverter on the premise of keeping the first change curve and the second change curve unchanged;
by predicting the generated power, controlling the second storage electric quantity of each energy storage inverter on the premise of ensuring that the output power is unchanged;
by changing the output power, on the premise of ensuring that the generated power is unchanged, controlling the third storage electric quantity of each energy storage inverter;
obtaining a fourth stored electric quantity of each energy storage inverter by changing the output power and the generated power;
and taking the first storage electric quantity, the second storage electric quantity, the third storage electric quantity and the fourth storage electric quantity as threshold values, acquiring the parallel connection quantity of the energy storage inverters according to the change conditions of the generated power and the output power, and carrying out charging or discharging control on a plurality of the energy storage inverters.
2. The multi-energy storage inverter parallel control method based on island operation according to claim 1, wherein the method comprises the following steps:
in the process of acquiring the first parallel quantity of the energy storage inverter, acquiring a first output current and a first charging speed of the energy storage inverter according to the output power and the generated power;
acquiring a second output current of the energy storage inverter according to the output power;
acquiring a second charging speed of the energy storage inverter according to the generated power;
and acquiring the first parallel quantity of the energy storage inverter according to the first output current, the second output current, the first charging speed and the second charging speed.
3. The multi-energy storage inverter parallel control method based on island operation according to claim 2, wherein the method comprises the following steps:
in the process of acquiring a first stored electric quantity, acquiring the conditions of time variation and climate variation of the output power and the generated power, and generating a first variation curve and a second variation curve;
normalizing the first change curve and the second change curve to obtain a first change rule of the output power and the generated power based on the time change and a second change rule based on the climate change;
based on the first parallel quantity of the energy storage inverters, the energy storage inverters are controlled according to the first change rule and the second change rule, and the energy storage inverters are used for controlling the daily residual electric quantity of each energy storage inverter to serve as the first storage electric quantity so as to meet the power consumption requirement of the load on the second day.
4. The multi-energy-storage inverter parallel control method based on island operation according to claim 3, wherein the method comprises the following steps of:
in the process of acquiring the second stored electric quantity, predicting the generated power by acquiring the weather change condition, acquiring a third change rule of the generated power based on the weather change condition, and acquiring the residual electric quantity of the energy storage inverter under the premise of the third change rule on the premise of not increasing the output power as the second stored electric quantity, wherein the residual electric quantity is used for meeting the electricity consumption requirement of the load under the weather change condition, and each energy storage inverter is controlled to charge or discharge according to the third change rule and the second stored electric quantity.
5. The multi-energy-storage inverter parallel control method based on island operation according to claim 4, wherein the method comprises the following steps:
in the process of obtaining the third stored electric quantity, based on the first parallel quantity of the energy storage inverters, the quantity of the loads is increased, on the premise of ensuring that the generated power is unchanged, the residual electric quantity of the energy storage inverters under the premise of increasing the output power is obtained and used as the third stored electric quantity to meet the electricity consumption requirement of the loads after the quantity of the loads is increased, and each energy storage inverter is controlled to charge or discharge according to the increased output power and the generated power.
6. The multi-energy storage inverter parallel control method based on island operation according to claim 5, wherein the method comprises the following steps:
in the process of increasing the load quantity, judging whether the increased load quantity meets the first parallel quantity of the energy storage inverter or not based on the first parallel quantity of the energy storage inverter and the second change curve; if yes, controlling each energy storage inverter according to the third stored electric quantity; if the output power and the generated power after the increase are not met, obtaining a second parallel number of the energy storage inverters;
and adjusting the first storage electric quantity, the second storage electric quantity and the third storage electric quantity based on the second parallel connection quantity, wherein the first storage electric quantity, the second storage electric quantity and the third storage electric quantity are used for meeting the electricity consumption requirement of the load after the load quantity is increased.
7. The multi-energy storage inverter parallel control method based on island operation according to claim 6, wherein the method comprises the following steps:
in the process of acquiring the fourth stored electricity quantity, based on a first factor for changing the output power, judging whether the first factor is necessarily related to the weather change condition or not:
if necessary connection exists, a fourth change rule of the output power based on the weather change condition is obtained, and the residual electric quantity of the energy storage inverter on the premise that the output power is increased and the generated power is changed is obtained according to the third change rule to serve as the fourth stored electric quantity, so that the electricity consumption requirement of the load on the premise that the output power and the generated power are changed is met;
and if the necessary connection does not exist, acquiring a fifth change rule of the output power, and acquiring the fourth stored electric quantity according to the third change rule, wherein the fifth change rule is used for representing the timeliness of the increase or the decrease of the load.
8. The multi-energy storage inverter parallel control method based on island operation according to claim 7, wherein the method comprises the following steps:
in the process of acquiring a fourth stored electric quantity according to a fourth change rule, judging whether the first parallel quantity or the second parallel quantity of the energy storage inverter meets the electricity consumption requirement of the load based on the fourth change rule and the third change rule, and acquiring the fourth stored electric quantity according to the fourth change rule and the third change rule if the first parallel quantity or the second parallel quantity of the energy storage inverter meets the electricity consumption requirement of the load based on the fourth change rule; if the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are not met, a third parallel connection quantity of the energy storage inverter is obtained according to the fourth change rule and the third change rule, and the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are adjusted based on the third parallel connection data so as to meet the electricity consumption requirement of the load under the weather change condition.
9. The multi-energy storage inverter parallel control method based on island operation according to claim 8, wherein the method comprises the following steps:
in the process of acquiring a fourth stored electric quantity according to a fifth change rule, judging whether the first parallel quantity or the second parallel quantity or the third parallel quantity of the energy storage inverter meets the electricity utilization requirement of the load based on the fifth change rule or not based on the fifth change rule and the third change rule, and acquiring the fourth stored electric quantity according to the fifth change rule and the third change rule if the first parallel quantity or the second parallel quantity or the third parallel quantity of the energy storage inverter meets the electricity utilization requirement of the load based on the fifth change rule;
if the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are not met, a fourth parallel connection quantity of the energy storage inverter is obtained according to the fifth change rule and the third change rule, and the first stored electric quantity, the second stored electric quantity, the third stored electric quantity and the fourth stored electric quantity are adjusted to meet the electricity consumption requirement of the load under the weather change condition.
10. The utility model provides a many energy storage inverters parallel control system based on island operation is down, its characterized in that, the little grid system that comprises a plurality of energy storage inverters, photovoltaic array, load is in island operation state for control a plurality of energy storage inverters's parallel control system includes:
the parallel quantity determining module is used for determining the first parallel quantity of the energy storage inverters by acquiring the output power of the load and the generated power of the photovoltaic array;
the first parallel selection module is used for respectively controlling each energy storage inverter to charge or discharge based on a first change curve of the output power and a second change curve of the generated power by acquiring the current running state of each energy storage inverter and controlling the first storage electric quantity of each energy storage inverter on the premise of keeping the first change curve and the second change curve unchanged;
the second parallel selection module is used for controlling the second storage electric quantity of each energy storage inverter on the premise of ensuring the output power to be unchanged by predicting the generated power;
the third parallel selection module is used for controlling the third storage electric quantity of each energy storage inverter on the premise of ensuring that the generated power is unchanged by changing the output power;
the fourth parallel selection module is used for obtaining a fourth storage electric quantity of each energy storage inverter by changing the output power and the generated power;
and the parallel control module is used for taking the first storage electric quantity, the second storage electric quantity, the third storage electric quantity and the fourth storage electric quantity as threshold values, acquiring the parallel quantity of the energy storage inverters according to the change rule of the generated power and the output power, and carrying out charging or discharging control on a plurality of the energy storage inverters.
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