CN113765130A - Operation control method of micro-grid - Google Patents

Operation control method of micro-grid Download PDF

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Publication number
CN113765130A
CN113765130A CN202110928371.6A CN202110928371A CN113765130A CN 113765130 A CN113765130 A CN 113765130A CN 202110928371 A CN202110928371 A CN 202110928371A CN 113765130 A CN113765130 A CN 113765130A
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energy storage
control module
storage converter
power
storage battery
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周玉
朱卓敏
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Shanghai Powershare Information Technology Co ltd
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Shanghai Powershare Information Technology Co ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an operation control method of a microgrid, which is used for tracking and processing problems of photovoltaic surplus electricity countercurrent Internet access and transformer overload in the microgrid. The technical scheme provided by the invention does not influence the normal operation of the photovoltaic device and the energy storage device in the micro-grid, namely peak clipping and valley filling, and can effectively avoid the occurrence of the situation of photovoltaic surplus electricity or reverse power surfing of the energy storage device or overload operation of a user transformer.

Description

Operation control method of micro-grid
Technical Field
The invention relates to the field of electric power, in particular to an operation control method of a microgrid.
Background
The micro-grid is used as an important support of 'internet +' smart energy and a technical means of friendly interaction with a large power grid, so that the safety and reliability of a power system can be improved, the access and local consumption of clean energy are promoted, the energy utilization efficiency is improved, an important role is played in energy conservation and emission reduction, and the construction of a conservation-oriented society is facilitated.
In 27/8 of 2020, China development reform Commission and State energy agency disclose guiding opinions (solicited opinions) about developing wind, light, water, fire and storage integration and source network and storage integration by the State energy agency, and the guiding opinions indicate that deep-level contradictions such as low comprehensive efficiency of a power system, insufficient coordination of links such as source network and load, insufficient complementation and mutual economy of various power supplies in China are increasingly prominent and need to be comprehensively optimized. The construction of 'park level source network load and storage integration' is definitely proposed and developed. The regulation response capability of the load side is fully adjusted based on modern information communication technology, big data, artificial intelligence, energy storage and other new technologies. The method is characterized in that a park level source network load and storage integrated construction combining distributed power generation and flexible charging and discharging of electric automobiles is developed in urban commercial districts and commercial complexes by relying on photovoltaic power generation, grid-connected micro-grids, electric automobile charging infrastructure construction and the like; in areas with large industrial load scale and good new energy resource conditions, development and construction of distributed power supplies and nearby access consumption are supported, and the construction of a source-network load-storage integrated green power supply industrial park is developed by combining the work of an incremental power distribution network and the like. The comprehensive optimization configuration scheme of source, network, load and storage is researched, the fusion development with the multi-energy complementary demonstration park and intelligent comprehensive energy service is promoted, the self-balancing capacity is improved under the economic and feasible conditions, and the peak regulation and capacity reserve requirements of a large power grid are reduced.
The micro-grid refers to a small-sized power distribution and utilization system which is composed of a distributed power supply, a power utilization load, a power distribution facility, a monitoring and protecting device and the like. The micro-grid is divided into a grid-connected micro-grid and an independent micro-grid, and self-control and autonomous management can be realized. The grid-connected micro-grid can be operated in a grid-connected mode with an external power grid or independently operated off the grid; the independent micro-grid is not connected with an external power grid, and the electric power and the electric quantity are self-balanced.
The photovoltaic and energy storage integrated microgrid is a typical microgrid networking form, and during the low-price valley period, users preferentially use photovoltaic power supply and charge the energy storage at the same time, and the photovoltaic is supplemented by commercial power when the photovoltaic is insufficient; during the peak period of the electricity price, the energy storage and the photovoltaic are preferentially used for supplying power to the user, and the insufficient part is supplemented by the commercial power. Not only realizes peak clipping and valley filling, but also realizes green replacement of electric energy and reduces carbon emission.
However, the following problems may be encountered during the operation of the light storage integrated microgrid:
(1) when the energy storage device is in peak clipping (discharging), if the total power consumption of a user-the power generation power of the photovoltaic power generation device is less than the discharge power of the energy storage device, the electric energy of the energy storage device can flow back to a superior power grid accessed by the user, so that the peak clipping income of the energy storage device is reduced;
(2) in the power generation process of the photovoltaic power generation device, the situation that the photovoltaic power generation power is larger than the total power consumption of a user may occur, and redundant electric energy of the photovoltaic power generation device can flow back to a superior power grid accessed by the user, so that the photovoltaic power generation income is reduced;
(3) when the energy storage device is in valley filling (charging), if the charging power of the energy storage device is too high, the total power consumption of a user is too high, and overload operation or even tripping of a transformer of the user may be caused, so that the efficiency, the service life and the power consumption safety of the transformer are influenced.
Currently, the mainstream energy storage device in the market generally sets the charge and discharge power of the energy storage device at each time interval in advance to realize peak clipping and valley filling operation (for example, 8: 00-12: 00 sets the energy storage device to discharge, the discharge power is 200kW, 0: 00-8: 00 sets the energy storage device to charge, and the charge power is 100kW), a control method for preventing backflow and transformer overload is not designed in a microgrid, and the energy storage device cannot adjust the charge and discharge power in real time according to the power consumption of a user and the power generation power of a photovoltaic, so that the situations of photovoltaic surplus power, reverse power on-line of the energy storage device or overload operation of a transformer of the user are easy to occur.
In addition, in the prior art, according to historical power utilization data of a user and a future power utilization plan (if the photovoltaic power generation device is newly built, future power generation data of the photovoltaic power generation device needs to be predicted), the minimum chargeable power and the maximum dischargeable power of the energy storage device in each power utilization period are preset, and then the charging and discharging power of the energy storage device in each power utilization period is set, so that a plurality of problems exist in the mode:
(1) the workload is large, and a large amount of historical electricity utilization data of users need to be counted;
(2) the timeliness is poor, and when the power utilization condition of a user is changed unpredictably, the operation parameters of the energy storage device cannot be adjusted in advance;
(3) the photovoltaic power generation prediction accuracy is poor, the photovoltaic power generation data prediction difficulty is large, and the photovoltaic power generation is unstable, so that the accuracy of the preset charging and discharging power of the energy storage device is poor.
Disclosure of Invention
In view of the above, there is a need for providing an operation control method for a microgrid, which can enable an energy storage device to perform peak clipping and valley filling operations, and simultaneously eliminate redundant electric energy generated by a photovoltaic device, thereby avoiding the occurrence of photovoltaic surplus electricity, reverse power grid connection of the energy storage device, or overload operation of a user transformer.
The technical scheme provided by the invention is as follows:
the invention provides an operation control method of a microgrid, which is used for tracking and processing problems of photovoltaic residual electricity reverse-flow internet access and transformer overload in the microgrid, wherein the microgrid comprises a mains supply, an energy storage device and a control module, wherein the energy storage device comprises an energy storage battery and an energy storage converter matched with the energy storage battery, the energy storage converter has a charging mode and a discharging mode, the energy storage converter controls the energy storage battery to be charged in the charging mode, and the energy storage converter controls the energy storage battery to be discharged in the discharging mode; the control module can acquire the state of charge of the energy storage battery, the working mode and the working power of the energy storage converter and the commercial power value of the commercial power supply in real time, and the operation control method of the microgrid comprises the following steps:
if the current time is in the peak time period, the control module judges whether the commercial power value of the current time is greater than a preset photovoltaic surplus power tracking threshold value, if not, the control module acquires the working mode of the energy storage converter and the charge state of the energy storage battery, judges whether the commercial power value of the current time is less than a preset transformer maximum load value, and if the commercial power value of the current time is less than the preset transformer maximum load value, the control module controls the energy storage converter to work, so that the energy storage device is charged.
Further, the acquiring, by the control module, the operating mode of the energy storage converter and the state of charge of the energy storage battery includes:
when the energy storage converter is in a shutdown state, if the charge state of the energy storage battery is smaller than the preset energy storage battery charging depth and the commercial power value at the current time is smaller than the preset transformer highest load value, the control module controls the energy storage converter to be started and switched to a charging mode, and adjusts the charging power of the energy storage converter to the maximum charging power of the energy storage converter.
Further, the acquiring, by the control module, the operating mode of the energy storage converter and the state of charge of the energy storage battery further includes:
when the energy storage converter is in a starting state and in a charging mode, if the charge state of the energy storage battery is smaller than the preset charging depth of the energy storage battery, the control module judges whether the commercial power value at the current time is smaller than the preset maximum load value of the transformer, if so, and the charging power of the energy storage converter is smaller than the maximum charging power of the energy storage converter, and the control module improves the charging power of the energy storage converter; if not, the control module reduces the charging power of the energy storage converter;
and if the charge state of the energy storage battery is greater than the preset charging depth of the energy storage battery, the control module controls the energy storage converter to be shut down.
Further, the acquiring, by the control module, the operating mode of the energy storage converter and the state of charge of the energy storage battery further includes:
when the energy storage converter is in a starting state and in a discharging mode, the control module controls the energy storage converter to be shut down.
Further, the charging power of the energy storage converter is obtained by the following formula:
Pi＝P′i×Ii
in the formula, PiIs charging power of the energy storage converter, P'iFor the maximum charging power of the energy storage battery, IiAnd the charging power increase coefficient of the energy storage battery.
Further, the operation control method of the microgrid further comprises the following steps:
if the current time is in the peak time period, the control module judges whether the commercial power value of the current time is greater than a preset photovoltaic residual power tracking threshold value, if so, the control module acquires the working mode of the energy storage converter and the charge state of the energy storage battery and judges whether the commercial power value of the current time is greater than a preset commercial power anti-reflux threshold value, and if the commercial power value of the current time is greater than the preset commercial power anti-reflux threshold value, the control module controls the energy storage converter to work so that the energy storage device discharges.
Further, the acquiring, by the control module, the operating mode of the energy storage converter and the state of charge of the energy storage battery includes:
when the energy storage converter is in a shutdown state, if the charge state of the energy storage battery is greater than the preset discharge depth of the energy storage battery, and the commercial power value at the current time is greater than the preset commercial power anti-reflux threshold value, the control module controls the energy storage converter to be started and switched to a discharge mode, and adjusts the discharge power of the energy storage converter to the maximum discharge power of the energy storage converter.
Further, the acquiring, by the control module, the operating mode of the energy storage converter and the state of charge of the energy storage battery further includes:
when the energy storage converter is in a starting state and in a discharging mode, if the charge state of the energy storage battery is larger than the preset discharging depth of the energy storage battery, the control module judges whether the commercial power value at the current time is larger than a preset commercial power anti-reflux threshold value, if so, and the discharging power of the energy storage converter is smaller than the maximum discharging power of the energy storage converter, and the control module improves the discharging power of the energy storage converter; if not, the control module reduces the discharge power of the energy storage converter;
and if the charge state of the energy storage battery is smaller than the preset discharge depth of the energy storage battery, the control module controls the energy storage converter to be shut down.
Further, the acquiring, by the control module, the operating mode of the energy storage converter and the state of charge of the energy storage battery further includes:
when the energy storage converter is in a starting state and in a charging mode, the control module controls the energy storage converter to be shut down.
Further, the discharge power of the energy storage converter is obtained by the following formula:
Po＝P′o×Io
in the formula, PoDischarge power of the energy storage converter, P'oIs the maximum discharge power of the energy storage cell, IoAnd the discharge power increase coefficient of the energy storage battery is obtained.
Further, the operation control method of the microgrid further comprises the following steps:
if the current time is in the period of normal time or valley time, the control module acquires the working mode of the energy storage converter and the state of charge of the energy storage battery, and judges whether the commercial power value of the current time is smaller than a preset maximum load value of the transformer, if so, the control module controls the energy storage converter to work, so that the energy storage device is charged.
The invention has the following advantages:
a) the normal operation of the photovoltaic device and the energy storage device in the micro-grid, namely peak clipping and valley filling, cannot be influenced, and meanwhile, the situation that photovoltaic surplus electricity or electric energy of the energy storage device is reversely connected to the network or a user transformer runs in an overload mode can be effectively avoided;
b) according to the power consumption of a user and the power generation power of the photovoltaic device, the charging and discharging power of the energy storage device is adjusted in real time;
c) the micro-grid can be automatically controlled without collecting a large amount of user historical data and manual frequent operation, and only by presetting operation parameters.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of an operation control method of a microgrid provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a microgrid provided in an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood and more clearly understood by those skilled in the art, the technical solutions of the embodiments of the present invention will be described below in detail and completely with reference to the accompanying drawings. It should be noted that the implementations not shown or described in the drawings are in a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints. It is to be understood that the described embodiments are merely exemplary of a portion of the invention and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In one embodiment of the invention, an operation control method of a micro-grid is provided, which is used for tracking and processing photovoltaic surplus electricity reverse-flow online and transformer overload problems in the micro-grid.
As shown in fig. 2, the microgrid includes a mains supply, a photovoltaic device, an energy storage device, and a control module. The photovoltaic device is a general name of all devices used for realizing photovoltaic power generation in a photovoltaic power generation system. The energy storage device is a general name of all equipment used for realizing charging and discharging of the energy storage battery in the energy storage system.
The energy storage device comprises an energy storage battery and an energy storage converter (PCS) matched with the energy storage battery, wherein the energy storage converter is a converter which is connected between a battery system and a power grid (and/or a load) in an electrochemical energy storage system and realizes bidirectional conversion of electric energy. The energy storage converter is provided with a charging mode and a discharging mode, the energy storage converter controls the energy storage battery to be charged in the charging mode, and the energy storage converter controls the energy storage battery to be discharged in the discharging mode.
The control module is connected with the mains supply and the energy storage device respectively, and can acquire the state of charge of the energy storage battery, the working mode and the working power of the energy storage converter and the mains supply power value of the mains supply in real time. The state of charge (SOC) is a ratio of the remaining capacity of the battery to the capacity of the battery, the SOC is used for reflecting the remaining capacity of the battery, the value range of the SOC is 0-1, and when the SOC is 0, the battery is completely discharged; when the SOC is 1, it indicates that the battery is fully charged.
As shown in fig. 1, the operation control method of the microgrid includes:
if the current time is in the peak time period, the control module judges whether the commercial power value of the current time is greater than a preset photovoltaic residual power tracking threshold:
(1) if the photovoltaic device is in risk of reverse internet access, the control module acquires the working mode of the energy storage converter and the charge state of the energy storage battery, judges whether the commercial power value at the current time is smaller than a preset transformer highest load value, and controls the energy storage converter to work if the commercial power value at the current time is smaller than the preset transformer highest load value, so that the energy storage device is charged.
The control module obtains the working mode of the energy storage converter and the state of charge of the energy storage battery and comprises the following steps:
a. when the energy storage converter is in a shutdown state, if the charge state of the energy storage battery is smaller than the preset energy storage battery charging depth and the commercial power value at the current time is smaller than the preset transformer highest load value, the control module controls the energy storage converter to be started and switched to a charging mode, and adjusts the charging power of the energy storage converter to the maximum charging power of the energy storage converter.
b. When the energy storage converter is in a starting state and in a charging mode, comparing the charge state of the energy storage battery with a preset charge depth of the energy storage battery:
if the state of charge of the energy storage battery is smaller than the preset charging depth of the energy storage battery, the control module judges whether the commercial power value at the current time is smaller than the preset maximum load value of the transformer, if so, and the charging power of the energy storage converter is smaller than the maximum charging power of the energy storage converter, the control module improves the charging power of the energy storage converter; if not, the control module reduces the charging power of the energy storage converter.
And if the charge state of the energy storage battery is greater than the preset charging depth of the energy storage battery, the control module controls the energy storage converter to be shut down.
c. When the energy storage converter is in a starting state and in a discharging mode, the control module controls the energy storage converter to be shut down.
(2) If the photovoltaic device does not have the risk of reverse internet access, the control module acquires the working mode of the energy storage converter and the charge state of the energy storage battery, judges whether the commercial power value at the current time is greater than a preset commercial power anti-reflux threshold value, and controls the energy storage converter to work to enable the energy storage device to discharge if the commercial power value at the current time is greater than the preset commercial power anti-reflux threshold value.
The control module obtains the working mode of the energy storage converter and the state of charge of the energy storage battery and comprises the following steps:
a. when the energy storage converter is in a shutdown state, if the charge state of the energy storage battery is greater than the preset discharge depth of the energy storage battery, and the commercial power value at the current time is greater than the preset commercial power anti-reflux threshold value, the control module controls the energy storage converter to be started and switched to a discharge mode, and adjusts the discharge power of the energy storage converter to the maximum discharge power of the energy storage converter.
b. When the energy storage converter is in a starting state and in a discharging mode, comparing the charge state of the energy storage battery with a preset energy storage battery discharging depth:
if the state of charge of the energy storage battery is larger than the preset energy storage battery discharge depth, the control module judges whether the commercial power value at the current time is larger than a preset commercial power anti-reflux threshold value, if so, and the discharge power of the energy storage converter is smaller than the maximum discharge power of the energy storage converter, and the control module improves the discharge power of the energy storage converter; and if not, the control module reduces the discharge power of the energy storage converter.
And if the charge state of the energy storage battery is smaller than the preset discharge depth of the energy storage battery, the control module controls the energy storage converter to be shut down.
c. When the energy storage converter is in a starting state and in a charging mode, the control module controls the energy storage converter to be shut down.
It should be noted that, comparing the commercial power and the photovoltaic remaining power tracking threshold value aims to determine whether there is a possibility of photovoltaic reverse grid connection, and comparing the commercial power and the commercial power anti-reflux threshold value, especially when the commercial power is less than or equal to the commercial power anti-reflux threshold value, this indicates that once the energy storage battery is discharged, there is a possibility of reverse grid connection, so the energy storage battery cannot be discharged.
The charging depth of the energy storage battery is the maximum SOC which can be reached in the charging process of the battery, if the charging state of the energy storage battery is smaller than the preset charging depth of the energy storage battery, the energy storage battery has the charging capacity, the energy storage battery can be controlled to be charged, otherwise, the energy storage battery cannot be charged continuously.
The discharge depth of the energy storage battery is the minimum SOC which can be reached in the discharge process of the battery, if the charge state of the energy storage battery is greater than the preset discharge depth of the energy storage battery, the energy storage battery has the discharge capacity, the energy storage battery can be controlled to discharge, otherwise, the energy storage battery cannot continue to discharge.
In an embodiment of the present invention, a method for calculating the charging power of the energy storage converter is provided, which is obtained by the following formula:
Pi＝P′i×Ii
in the formula, PiIs charging power of the energy storage converter, P'iFor the maximum charging power of the energy storage battery, IiAnd the charging power increase coefficient of the energy storage battery.
It should be noted that, in a scenario where the user power consumption is normal, the user power consumption is too low but the photovoltaic device is still generating power or the energy storage device is still discharging, and the user power consumption is too high but the energy storage device is still charging, the charging power of the energy storage converter needs to be adjusted, and specific values thereof may be different or equal, which does not limit the protection scope of the present invention.
In an embodiment of the present invention, a method for calculating the discharge power of the energy storage converter is provided, which is obtained by the following formula:
Po＝P′o×Io
in the formula, PoDischarge power of the energy storage converter, P'oIs the maximum discharge power of the energy storage cell,Ioand the discharge power increase coefficient of the energy storage battery is obtained.
It should be noted that, in a scenario where the user power consumption is normal, the user power consumption is too low but the photovoltaic device is still generating power or the energy storage device is still discharging, and the user power consumption is too high but the energy storage device is still charging, the discharging power of the energy storage converter needs to be adjusted, and the specific values may be different or equal, which does not limit the protection scope of the present invention.
In an embodiment of the present invention, there is provided an operation control method of a microgrid, as shown in fig. 1, the operation control method of the microgrid further includes:
if the current time is in the period of normal time or valley time, the control module acquires the working mode of the energy storage converter and the state of charge of the energy storage battery, and judges whether the commercial power value of the current time is smaller than a preset maximum load value of the transformer, if so, the control module controls the energy storage converter to work, so that the energy storage device is charged.
The control module obtains the working mode of the energy storage converter and the state of charge of the energy storage battery and comprises the following steps:
a. when the energy storage converter is in a shutdown state, if the charge state of the energy storage battery is smaller than the preset energy storage battery charging depth and the commercial power value at the current time is smaller than the preset transformer highest load value, the control module controls the energy storage converter to be started and switched to a charging mode, and adjusts the charging power of the energy storage converter to the maximum charging power of the energy storage converter.
b. When the energy storage converter is in a starting state and in a charging mode, comparing the charge state of the energy storage battery with a preset charge depth of the energy storage battery:
if the state of charge of the energy storage battery is smaller than the preset charging depth of the energy storage battery, the control module judges whether the commercial power value at the current time is smaller than the preset maximum load value of the transformer, if so, and the charging power of the energy storage converter is smaller than the maximum charging power of the energy storage converter, the control module improves the charging power of the energy storage converter; if not, the control module reduces the charging power of the energy storage converter.
And if the charge state of the energy storage battery is greater than the preset charging depth of the energy storage battery, the control module controls the energy storage converter to be shut down.
c. When the energy storage converter is in a starting state and in a discharging mode, the control module controls the energy storage converter to be shut down.
In one embodiment of the present invention, there is provided a motion control system of a microgrid, which operates based on the operation control method of the microgrid described in the above embodiment.
In one embodiment of the present invention, a motion control system for a microgrid is provided, wherein relevant configuration parameters are shown in table 1:
TABLE 1 configuration parameter Table
Figure BDA0003209992080000101
Figure BDA0003209992080000111
It should be noted that, the photovoltaic remaining power tracking threshold in the above table is 0, which means that the tolerance to photovoltaic backflow and grid connection is relatively high, and the energy storage device does not need to respond in advance. If this value is increased, the more the increase, the less tolerance for the photovoltaic reverse-current grid-connection is indicated.
Specifically, the present embodiment includes the following procedures and steps:
(1) and collecting user electricity utilization period information, an energy storage device and rated parameters of the transformer.
(2) And recording the collected information in the configuration table as judgment conditions of each flow in the operation process.
(3) In a configuration table, a battery charging power increase coefficient and a battery discharging power increase coefficient are input, the two parameters are key parameters of the system operation, and specific numerical values of the charging and discharging power of the energy storage device are regulated in a scene that the power consumption of a user is normal, the power consumption of the user is too low, the photovoltaic power generation device still generates power or the energy storage device still discharges power, and the power consumption of the user is too high, but the energy storage device still charges. Through the two parameters, the system realizes the charging and discharging power regulation without manual operation in the residual electricity tracking process of the energy storage device.
(4) In a configuration table, a maximum load rate of a transformer, a commercial power backflow prevention threshold value and a photovoltaic residual power tracking threshold value are input, and the three items are also key parameters of the operation of the system and specify when the system needs to adjust the charging and discharging power of the energy storage device and the direction of adjustment (increase or decrease).
(5) And the micro-grid adjusts the charging and discharging power of the energy storage device according to the output instruction.
The idea of the embodiment of the motion control system and the working process of the operation control method in the embodiment belong to the same idea, and the entire contents of the embodiment of the operation control method are incorporated into the embodiment of the motion control system by full reference, which is not described again.
The invention mainly solves the problem that the photovoltaic surplus power or the electric energy reverse internet access of the energy storage device or the overload operation of a user transformer is easy to occur because the energy storage device cannot adjust the charge and discharge power in real time according to the power consumption of the user and the photovoltaic power generation in the existing scheme because a photovoltaic surplus power tracking strategy for preventing the reverse flow and the transformer overload is not designed in the micro-grid. The invention provides an operation control method of a microgrid, which does not need manual frequent operation, can automatically operate only by presetting operation conditions, does not influence the operation of a photovoltaic power generation device and the peak clipping and valley filling operation of an energy storage device in the microgrid after operation, and can effectively avoid the occurrence of the conditions of photovoltaic surplus power or reverse power surfing of the energy storage device or overload operation of a user transformer.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes that can be directly or indirectly applied to other related technical fields using the contents of the present specification and the accompanying drawings are included in the scope of the present invention.

Claims (11)

1. The operation control method of the microgrid is characterized by being used for tracking and processing problems of photovoltaic residual electricity reverse-flow internet access and transformer overload in the microgrid, wherein the microgrid comprises a mains supply, an energy storage device and a control module, the energy storage device comprises an energy storage battery and an energy storage converter matched with the energy storage battery, the energy storage converter has a charging mode and a discharging mode, the energy storage converter controls the energy storage battery to be charged in the charging mode, and the energy storage converter controls the energy storage battery to be discharged in the discharging mode; the control module can acquire the state of charge of the energy storage battery, the working mode and the working power of the energy storage converter and the commercial power value of the commercial power supply in real time, and the operation control method of the microgrid comprises the following steps:
if the current time is in the peak time period, the control module judges whether the commercial power value of the current time is greater than a preset photovoltaic surplus power tracking threshold value, if not, the control module acquires the working mode of the energy storage converter and the charge state of the energy storage battery, judges whether the commercial power value of the current time is less than a preset transformer maximum load value, and if the commercial power value of the current time is less than the preset transformer maximum load value, the control module controls the energy storage converter to work, so that the energy storage device is charged.
2. The operation control method of the microgrid of claim 1, wherein the step of acquiring the operating mode of the energy storage converter and the state of charge of the energy storage battery by the control module comprises the steps of:
when the energy storage converter is in a shutdown state, if the charge state of the energy storage battery is smaller than the preset energy storage battery charging depth and the commercial power value at the current time is smaller than the preset transformer highest load value, the control module controls the energy storage converter to be started and switched to a charging mode, and adjusts the charging power of the energy storage converter to the maximum charging power of the energy storage converter.
3. The method for controlling the operation of the microgrid according to claim 1, wherein the step of acquiring the operating mode of the energy storage converter and the state of charge of the energy storage battery by the control module further comprises the steps of:
when the energy storage converter is in a starting state and in a charging mode, if the charge state of the energy storage battery is smaller than the preset charging depth of the energy storage battery, the control module judges whether the commercial power value at the current time is smaller than the preset maximum load value of the transformer, if so, and the charging power of the energy storage converter is smaller than the maximum charging power of the energy storage converter, and the control module improves the charging power of the energy storage converter; if not, the control module reduces the charging power of the energy storage converter;
and if the charge state of the energy storage battery is greater than the preset charging depth of the energy storage battery, the control module controls the energy storage converter to be shut down.
4. The method for controlling the operation of the microgrid according to claim 1, wherein the step of acquiring the operating mode of the energy storage converter and the state of charge of the energy storage battery by the control module further comprises the steps of:
when the energy storage converter is in a starting state and in a discharging mode, the control module controls the energy storage converter to be shut down.
5. The operation control method of the microgrid according to claim 2 or 3, characterized in that the charging power of the energy storage converter is obtained by the following formula:
Pi＝P′i×Ii
in the formula, PiIs charging power of the energy storage converter, P'iFor the maximum charging power of the energy storage battery, IiCharging power increase system of the energy storage batteryAnd (4) counting.
6. The operation control method of the microgrid of claim 1, further comprising:
if the current time is in the peak time period, the control module judges whether the commercial power value of the current time is greater than a preset photovoltaic residual power tracking threshold value, if so, the control module acquires the working mode of the energy storage converter and the charge state of the energy storage battery and judges whether the commercial power value of the current time is greater than a preset commercial power anti-reflux threshold value, and if the commercial power value of the current time is greater than the preset commercial power anti-reflux threshold value, the control module controls the energy storage converter to work so that the energy storage device discharges.
7. The operation control method of the microgrid of claim 6, wherein the step of acquiring the operating mode of the energy storage converter and the state of charge of the energy storage battery by the control module comprises the steps of:
when the energy storage converter is in a shutdown state, if the charge state of the energy storage battery is greater than the preset discharge depth of the energy storage battery, and the commercial power value at the current time is greater than the preset commercial power anti-reflux threshold value, the control module controls the energy storage converter to be started and switched to a discharge mode, and adjusts the discharge power of the energy storage converter to the maximum discharge power of the energy storage converter.
8. The method for controlling the operation of the microgrid according to claim 6, wherein the step of acquiring the operating mode of the energy storage converter and the state of charge of the energy storage battery by the control module further comprises the steps of:
when the energy storage converter is in a starting state and in a discharging mode, if the charge state of the energy storage battery is larger than the preset discharging depth of the energy storage battery, the control module judges whether the commercial power value at the current time is larger than a preset commercial power anti-reflux threshold value, if so, and the discharging power of the energy storage converter is smaller than the maximum discharging power of the energy storage converter, and the control module improves the discharging power of the energy storage converter; if not, the control module reduces the discharge power of the energy storage converter;
and if the charge state of the energy storage battery is smaller than the preset discharge depth of the energy storage battery, the control module controls the energy storage converter to be shut down.
9. The method for controlling the operation of the microgrid according to claim 6, wherein the step of acquiring the operating mode of the energy storage converter and the state of charge of the energy storage battery by the control module further comprises the steps of:
when the energy storage converter is in a starting state and in a charging mode, the control module controls the energy storage converter to be shut down.
10. The operation control method of the microgrid according to claim 7 or 8, characterized in that the discharge power of the energy storage converter is obtained by the following formula:
Po＝P′o×Io
in the formula, PoDischarge power of the energy storage converter, P'oIs the maximum discharge power of the energy storage cell, IoAnd the discharge power increase coefficient of the energy storage battery is obtained.
11. The operation control method of the microgrid of claim 1, further comprising:
if the current time is in the period of normal time or valley time, the control module acquires the working mode of the energy storage converter and the state of charge of the energy storage battery, and judges whether the commercial power value of the current time is smaller than a preset maximum load value of the transformer, if so, the control module controls the energy storage converter to work, so that the energy storage device is charged.
CN202110928371.6A 2021-08-13 2021-08-13 Operation control method of micro-grid Pending CN113765130A (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN114825471A (en) * 2022-06-28 2022-07-29 长沙矿冶研究院有限责任公司 Automatic coordination control method and system for light storage charging and discharging micro-grid system
CN115719964A (en) * 2022-09-06 2023-02-28 新至储能科技(浙江)有限公司 Energy storage battery automatic charging and discharging system and method based on load tracking
CN116566020A (en) * 2023-07-05 2023-08-08 深圳海辰储能控制技术有限公司 Charging and discharging power control method and device of energy storage system
CN117277595A (en) * 2023-09-28 2023-12-22 宁夏宝丰昱能科技有限公司 Control method and system of energy storage power station
WO2024028643A1 (en) * 2022-08-04 2024-02-08 Abu Dhabi National Oil Company Controlling a supply of electricity to an electricity consumer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114825471A (en) * 2022-06-28 2022-07-29 长沙矿冶研究院有限责任公司 Automatic coordination control method and system for light storage charging and discharging micro-grid system
CN114825471B (en) * 2022-06-28 2022-09-27 长沙矿冶研究院有限责任公司 Automatic coordination control method and system for optical storage charging and discharging micro-grid system
WO2024028643A1 (en) * 2022-08-04 2024-02-08 Abu Dhabi National Oil Company Controlling a supply of electricity to an electricity consumer
CN115719964A (en) * 2022-09-06 2023-02-28 新至储能科技(浙江)有限公司 Energy storage battery automatic charging and discharging system and method based on load tracking
CN116566020A (en) * 2023-07-05 2023-08-08 深圳海辰储能控制技术有限公司 Charging and discharging power control method and device of energy storage system
CN116566020B (en) * 2023-07-05 2023-09-12 深圳海辰储能控制技术有限公司 Charging and discharging power control method and device of energy storage system
CN117277595A (en) * 2023-09-28 2023-12-22 宁夏宝丰昱能科技有限公司 Control method and system of energy storage power station

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