CN113141057A - Monitoring integrated device for microgrid and distributed control method - Google Patents
Monitoring integrated device for microgrid and distributed control method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
- G06Q10/06312—Adjustment or analysis of established resource schedule, e.g. resource or task levelling, or dynamic rescheduling
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- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
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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
- H02J3/38—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
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/14—Energy storage units
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Abstract
The invention relates to a monitoring integrated device and a distributed control method for a microgrid, wherein the integrated device comprises a control module and an electric energy main circuit, and the control module comprises: the electric energy conversion control unit is used for controlling the electric energy main circuit to complete conversion between direct current and alternating current; the redundancy capacity control unit is used for sharing the control requirements of overflow of the electric energy conversion control unit and the coordination control unit according to the control task conditions of the electric energy conversion control unit and the coordination control unit; the coordination control unit is used for calculating the received data so as to obtain a coordination control strategy; the cooperative control strategy comprises a strategy for scheduling the power of the microgrid and a strategy for governing harmonic waves in the microgrid. The invention concentrates the data in the coordination control unit for processing, and does not carry out remote transmission with the control instruction of the microgrid central control system, namely, the invention controls each index of the microgrid in real time, in a short distance and in cooperation of multiple machines, thereby avoiding errors in the processing or transmission process and improving the real-time property and the reliability of the microgrid control.
Description
Technical Field
The invention relates to the technical field of microgrid distributed control, in particular to a monitoring integrated device for a microgrid and a distributed control method.
Background
In recent years, a microgrid and an operation control technology thereof are widely researched, and different research institutions make more research results on the topological structure of the microgrid, the scheduling control of the microgrid, the protection of the microgrid, the design and control of a converter in the microgrid and the like. For improving the overall operation performance of the microgrid, two mainstream methods are adopted at present, one method is that a wired communication mode is adopted, a microgrid central controller is connected with key equipment in the microgrid, such as an inverter, and corresponding instructions are sent; and the other is that an autonomous operation strategy is set in key equipment of the microgrid, so that the microgrid converter can autonomously operate within a certain working condition range. However, the wired communication mode is dependent on the communication network for the transition, but the autonomous operation mode has a limited number of cases. In this case, if the control device of the microgrid is provided, independent design and guidance are required, which increases the operation cost of the microgrid
Disclosure of Invention
The invention aims to solve the problem of communication and control reliability in microgrid control in the prior art, and particularly aims to solve the problem that when a microgrid central control system is used for wired connection with equipment on each side in a microgrid in the prior art, the running of each equipment is too dependent on the microgrid central control system, and when the equipment on each side autonomously runs in a certain working condition range, no good information interaction exists among the equipment. Provided are a monitoring integrated device and a distributed control method for a microgrid.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
the utility model provides an integrative device of control for microgrid sets up respectively in electricity generation side, energy storage side, load side, integrative device includes integrative device of electricity generation side, integrative device of energy storage side, integrative device of load side, and every integrative device includes control module, electric energy main circuit, control module includes:
the electric energy conversion control unit is used for controlling the electric energy main circuit to complete conversion between direct current and alternating current;
the redundancy capacity control unit is used for sharing the control requirements of overflow of the electric energy conversion control unit and the coordination control unit according to the control task conditions of the electric energy conversion control unit and the coordination control unit;
the coordination control unit is used for calculating the received data so as to obtain a coordination control strategy; the cooperative control strategy comprises a strategy for scheduling the power of the microgrid and a strategy for governing harmonic waves in the microgrid;
the electric energy main circuit is electrically connected with the microgrid alternating current bus and used for completing conversion between direct current and alternating current according to the control of the electric energy conversion control unit.
In the scheme, an integrated device is respectively arranged on the power generation side, the energy storage side and the load side, and the conditions of the bus in the integrated device are collected and uniformly calculated and processed, so that a corresponding cooperative control strategy is obtained. The problem that after the condition of buses is automatically acquired by each device in the traditional microgrid control technology, the control command needs to be sent to the microgrid central control system for processing is solved, then the microgrid central control system calculates the control command for a certain device or a plurality of devices, and if a certain device fails, the control command calculated by the microgrid central control system is certain to be wrong, so that the devices are in operation mistakes, and the microgrid works abnormally, and serious consequences are caused is solved. The invention is characterized in that the functions of generating and sending instructions of the microgrid central control system are dispersed into the following integrated devices, namely, the instructions are completed in the integrated devices, so that the control mode is distributed.
Therefore, the scheme concentrates the data on the coordination control unit for processing, and does not need to carry out remote transmission with the control instruction of the micro-grid central control system, thereby avoiding errors in the processing or transmission process and improving the real-time performance and reliability of the micro-grid control.
Further, the integrated devices further comprise a communication module, the communication module comprises a wireless communication unit, and each integrated device communicates with the other integrated devices through the wireless communication unit, so that the coordination control unit receives data sent by other integrated devices through the wireless communication unit.
In the above scheme, a wireless communication unit is arranged in each integrated device, and the cooperative control strategy obtained by the coordination control unit in each side integrated device is mutually transmitted through the wireless communication unit, or other data, such as the voltage level of each side bus, is not required to be interacted with each side data through the microgrid central control system, so that the situation that all devices receive wrong control instructions when a certain device fails is avoided. According to the scheme, the micro-grid central control system is not relied on, so that the reliability of micro-grid control is enhanced, and the efficiency of micro-grid control is improved.
Furthermore, the communication module further comprises a wired communication unit, and each integrated device is connected with the microgrid communication bus through the wired communication unit, so that the coordination control unit interacts data with the microgrid central control system through the microgrid communication bus.
In the scheme, the microgrid central control system is used as a function for centrally storing data information without changing the traditional microgrid central control system, and data of the integrated devices at all sides are uploaded to the microgrid central control system for storage and display after being accessed to a microgrid communication bus through a wired communication unit, so that a user can conveniently call and check related data at the microgrid central control system.
Furthermore, the integrated device further comprises a power supply module, a protection circuit and an interaction device; the power supply module is used for supplying power to the control module, the communication module and the interaction equipment; the protection circuit is used for protecting the integrated device when the power supply module provides overvoltage or overcurrent; the interaction device comprises a touch screen and a data access interface, and is used for interacting with a user.
A distributed control method for a microgrid, comprising the steps of:
the method comprises the following steps that integrated devices are arranged on a power generation side, an energy storage side and a load side respectively, each integrated device comprises a control module, and each control module comprises an electric energy conversion control unit, a coordination control unit and a redundancy capacity control unit;
the electric energy conversion control unit controls the electric energy main circuit to complete conversion between direct current and alternating current;
the coordination control unit calculates the received data to obtain a cooperative control strategy; the cooperative control strategy comprises a strategy for scheduling the power of the microgrid and a strategy for governing harmonic waves in the microgrid;
and the redundancy capacity control unit shares the control requirement of overflow of the electric energy conversion control unit and the coordination control unit according to the control task conditions of the electric energy conversion control unit and the coordination control unit.
As an implementation manner, the step of the coordination control unit calculating the received data to obtain the cooperative control strategy includes:
the method comprises the steps that a coordination control unit in an integrated device at an energy storage side monitors bus voltage levels at a power generation side and a load side in real time, when electric energy generated at the power generation side fluctuates and the generated energy at the power generation side is not matched with the electricity consumption at the load side, the coordination control unit of the integrated device at the energy storage side calculates the difference of bus active power and obtains an active power scheduling strategy; the difference of the bus active power is the bus active power at the power generation side minus the bus active power at the load side;
the coordination control unit of the energy storage side integrated device sends the obtained active power scheduling strategy to the electric energy conversion control unit of the energy storage side integrated device, and if the difference of the bus active power is a positive number, the electric energy conversion control unit controls the electric energy main circuit to absorb the active power on the bus; if the difference of the bus active power supply is negative, the electric energy conversion control unit controls the electric energy main circuit to send active power to the bus, so that the active power on the bus is balanced.
Furthermore, if the difference of the bus active power calculated by the coordination control unit of the energy storage side integrated device exceeds the control power of the energy storage side, the coordination control unit sends an active power scheduling strategy to the coordination control unit of the power generation side integrated device or the coordination control unit of the load side integrated device;
and controlling the main circuit to send out or absorb active power to the bus by the electric energy conversion control unit on the power generation side and/or the electric energy conversion control unit on the load side so that the active power on the bus is balanced.
As another possible implementation manner, the step of calculating, by the coordination control unit, the received data to obtain the cooperative control strategy includes:
a coordination control unit in the integrated device at the energy storage side monitors the bus voltage levels at the power generation side and the load side in real time, and when the bus reactive power at the power generation side and the bus reactive power at the load side are unbalanced, the coordination control unit of the integrated device at the energy storage side calculates the difference of the bus reactive power and obtains a reactive power scheduling strategy;
the coordination control unit of the energy storage side integrated device sends the obtained reactive power scheduling strategy to the coordination control unit of the power generation side integrated device, and the coordination control unit of the power generation side integrated device calculates a bus reactive power compensation value according to the received reactive power scheduling strategy, the self electric energy capacity and the power generation state;
and the electric energy conversion control unit controls the electric energy main circuit to generate reactive power to be compensated according to the bus reactive power compensation value, so that the reactive power on the bus is balanced.
It should be explained that, the step of monitoring the bus voltage levels of the power generation side and the load side in real time by the coordination control unit in the integrated device of the energy storage side includes:
a coordination control unit in the integrated device on the power generation side acquires the bus voltage level on the power generation side in real time, and a coordination control unit in the integrated device on the load side acquires the bus voltage level on the load side in real time;
and the coordination control unit in the integrated device on the energy storage side is in communication connection with the integrated device on the power generation side and the integrated device on the load side through the wireless communication unit respectively, so that the coordination control unit of the integrated device on the energy storage side monitors the bus voltage levels on the power generation side and the load side in real time, and the bus active power or/and reactive power on the power generation side and the load side are obtained.
As another possible implementation manner, the step of calculating, by the coordination control unit, the received data to obtain the cooperative control strategy includes:
a coordination control unit in the integrated device on the power generation side acquires the bus voltage level on the power generation side in real time, a coordination control unit in the integrated device on the energy storage side acquires the bus voltage level on the power generation side in real time, and a coordination control unit in the integrated device on the load side acquires the bus voltage level on the load side in real time;
when the coordination control unit monitors that the harmonic distortion rate on the bus exceeds a threshold value, the coordination control unit calculates a bus harmonic compensation value according to the harmonic distortion rate, the self electric energy capacity and the power generation state;
the coordination control unit sends the calculated bus harmonic compensation value to the electric energy conversion control unit on the side, and the electric energy conversion control unit controls the electric energy main circuit to send out harmonic compensation according to the bus harmonic compensation value, so that the harmonic distortion rate on the bus is within a threshold value.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention concentrates the data in the coordination control unit for processing, and does not carry out remote transmission with the control instruction of the microgrid central control system, thereby avoiding errors in the processing or transmission process and improving the real-time performance and the reliability of the microgrid control.
(2) According to the invention, the wireless communication units are arranged in each integrated device, the cooperative control strategies obtained by the cooperative control units in the integrated devices at all sides are mutually transmitted through the wireless communication units, or other data, such as the voltage level of buses at all sides, are not required to be transmitted through the microgrid central control system again during data interaction at all sides, so that the situation that all equipment receive wrong control instructions when some equipment fails is avoided. According to the scheme, the micro-grid central control system is not relied on, so that the reliability of micro-grid control is enhanced, and the efficiency of micro-grid control is improved.
(3) The microgrid central control system is used for centrally storing data information without changing the traditional microgrid central control system, such as canceling or recombining, and the data of the integrated devices on all sides are uploaded to the microgrid central control system for storage and display after being accessed to a microgrid communication bus through a wired communication unit, so that a user can conveniently call and check related data at the microgrid central control system.
(4) The coordination control unit in the integrated device calculates the harmonic waves of the power meter of the microgrid, so that a reasonable scheduling strategy and a treatment strategy are obtained, and the real-time monitoring of the working condition of each side bus in the microgrid is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a control module and an electric energy main circuit module of an integrated device on each side in a microgrid of the present invention;
fig. 2 is a block diagram of a communication module of a device integrated on each side in the microgrid according to the present invention;
FIG. 3 is a block diagram of an integrated device of the present invention;
fig. 4 is a schematic flow chart of the cooperative control strategy according to this embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention 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 invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Also, in the description of the present invention, the terms "first", "second", and the like are used for distinguishing between descriptions and not necessarily for describing a relative importance or implying any actual relationship or order between such entities or operations.
Example 1:
the invention provides an integrated device, which is realized by the following technical scheme that the integrated device for monitoring of a microgrid comprises a power generation side, an energy storage side and a load side, wherein the power generation side can be provided with a photovoltaic power generation side, a wind power generation side and the like, the electric energy generated by the power generation side is transmitted to the load side for power utilization, and the redundant or partial electric energy is stored in the energy storage side. As shown in fig. 1, the power generation side, the energy storage side and the load side are respectively provided with an integrated device, that is, the integrated device can be divided into an integrated device on the power generation side, an integrated device on the energy storage side and an integrated device on the load side.
Referring to fig. 3, each integrated device includes a control module, an electric energy main circuit, and a communication module, where the control module specifically includes an electric energy conversion control unit, a redundancy capability control unit, and a coordination control unit, where:
and the electric energy conversion control unit is used for controlling the electric energy main circuit to complete the conversion between the direct current and the alternating current.
The coordination control unit is used for calculating the received data so as to obtain a coordination control strategy; the cooperative control strategy comprises a strategy for scheduling the power of the microgrid and a strategy for governing harmonic waves in the microgrid. For example, after the cooperative control strategy is obtained through calculation, the cooperative control strategy is sent to the electric energy conversion control unit, and the electric energy conversion control unit controls the electric energy main circuit to complete conversion between direct current and alternating current according to the cooperative control strategy, so that electric energy is absorbed or sent to the microgrid bus, and the microgrid bus is balanced in operation.
And the redundancy capacity control unit is used for sharing the control requirements of overflow of the electric energy conversion control unit and the coordination control unit according to the control task conditions of the electric energy conversion control unit and the coordination control unit. For example, when the cooperative control strategy calculated by the cooperative control unit is complex in process and large in data volume, the redundant capability control unit assists the cooperative control unit to perform joint calculation, so that the calculation processing pressure of the cooperative control unit is reduced, and the working efficiency of the integrated device is improved. Or when the electric energy conversion control unit controls the electric energy main circuit to perform the electric energy conversion task, the control amount is too large, and the like, part of the control functions can be shared in the redundancy capacity control unit to share the control pressure of the electric energy conversion control unit, and the working efficiency of the integrated device is also improved.
The electric energy main circuit is electrically connected with a microgrid alternating current bus (referred to as a bus for short in the context), and the conversion between direct current and alternating current is completed according to the control of the electric energy conversion control unit, so that electric energy is absorbed or sent to the microgrid bus, and the microgrid bus is balanced in operation.
The communication module includes a wireless communication unit and a wired communication unit, as shown in fig. 2, the integrated device communicates with other integrated devices through the wireless communication unit, for example, when the integrated device on the power generation side communicates with the integrated device on the energy storage side, a communication connection is established through the respective wireless communication units. It is easy to understand that the integrated devices on the power generation side, the energy storage side and the load side all carry out communication data transmission through the wireless communication unit.
In traditional microgrid control, a microgrid central control system is in wired connection with a microgrid, when buses on a power generation side, an energy storage side and a load side are regulated and controlled, data are obtained and processed in a centralized mode through the microgrid central control system, and control is conducted. Therefore, in the conventional microgrid control, devices on all sides are too dependent on a microgrid central control system. In the invention, the integrated device can be connected with the microgrid communication bus through the wired communication unit, so that the integrated device is connected and communicated with the microgrid central control system and used for sending data of each side to the microgrid central control system for storage or display and the like, and the microgrid central control system does not send control instructions to equipment of each side any more.
With continued reference to fig. 3, the integrated device further includes a power module, a protection circuit, and an interactive device, where the power module is used to supply power to the control module, the communication module, and the interactive device; the protection circuit is used for protecting the integrated device when the power supply module provides overvoltage or overcurrent; the interaction device comprises a touch screen and a data access interface, and is used for interacting with a user.
The invention also provides a distributed control method for a microgrid based on the integrated device, please refer to fig. 1, wherein a coordinating control unit in the integrated device on the power generation side acquires the bus voltage level on the power generation side in real time, a coordinating control unit in the integrated device on the energy storage side acquires the bus voltage level on the energy storage side in real time, and a coordinating control unit in the integrated device on the load side acquires the bus voltage level on the load side in real time. Referring to fig. 2, the coordination control unit on each side communicates with the coordination control units on other sides through the wireless communication unit to implement data transmission and sharing.
By way of example, the present embodiment provides the following four cooperative control strategies, as shown in fig. 4, but the present invention is not limited to the following four strategies:
1. when the influence of the external environment is received, the electric energy sent by the power generation side can fluctuate, so that the generated energy of the power generation side is not matched with the power consumption of the load side. Because the power generation side and the load side can share data with the integrated device of the energy storage side in real time, the coordination control unit of the energy storage side can monitor the condition that the electric quantity of the power generation side is not matched with that of the load side.
And the coordination control unit of the energy storage side integrated device calculates the difference of the bus active power according to the data sent by the power generation side and the load side, and obtains an active power scheduling strategy.
And when calculating the bus active power difference, subtracting the bus active power on the load side from the bus active power on the power generation side, or subtracting the bus active power on the power generation side from the bus active power on the load side.
And the coordination control unit of the energy storage side integrated device sends the obtained active power scheduling strategy to each integrated device and performs cooperative control on the power generation side, the energy storage side and the load side.
If the bus active power difference on the power generation side is subtracted from the bus active power on the load side when the bus active power difference is calculated in the implementation, if the bus active power difference is a positive number, it indicates that the electric quantity output to the load side by the power generation side is greater than the electric quantity used by the load side, and at this time, the electric energy conversion control unit controls the electric energy main circuit to absorb the active power on the bus; if the difference of the bus active power is a negative number, which indicates that the electric quantity output to the load side from the power generation side is less than the electricity consumption of the load side, the electric energy conversion control unit controls the electric energy main circuit to send the active power to the bus, so that the active power on the bus is balanced.
2. On the basis of the condition 1, if the difference of the bus active power calculated by the coordination control unit of the energy storage side integrated device exceeds the control power of the energy storage side, for example, after calculation, Δ P active power needs to be sent to the bus to enable the microgrid bus to reach active power balance, but the electric energy main circuit of the energy storage side integrated device cannot completely compensate the power difference, the coordination control unit sends an active power scheduling strategy to the coordination control unit of the power generation side integrated device or the coordination control unit of the load side integrated device, so that the electric energy main circuit of the power generation side and/or the load side sends active power to the bus and/or cuts off part of load, and the active power on the bus is balanced.
Or for example, after calculation, the microgrid bus can reach active power balance only by absorbing Δ P active power on the bus, but when the main electric energy circuit of the energy storage side integrated device can only absorb part of the difference of the active power, the coordination control unit sends an active power scheduling strategy to the coordination control unit of the power generation side integrated device or the coordination control unit of the load side integrated device, so that part of the power generation units on the power generation side and/or part of the load side switching-in part can adjust the active power on the load absorption bus, and the active power on the bus is balanced.
3. When the reactive power of the generating side and the bus of the load side is unbalanced, the coordination control unit of the energy storage side integrated device calculates the difference of the reactive power of the bus and obtains a reactive power dispatching strategy. The way of calculating the difference can be the same as the way of calculating the difference of the active power, but the method of calculating the active power or the reactive power according to the bus voltage level belongs to the prior art, so the method is not repeated in the invention.
And the coordination control unit of the energy storage side integrated device sends the obtained reactive power scheduling strategy to the coordination control unit of the power generation side integrated device, and the data transmission mode is that the data are transmitted through the wireless communication unit. And the coordination control unit of the power generation side integrated device calculates a bus reactive power compensation value according to the received reactive power scheduling strategy, the self electric energy capacity and the power generation state. The self electric energy capacity and the generating state are the electric energy capacity and the generating state of the main electric energy circuit at the side.
And the coordination control unit of the power generation side integrated device sends the calculated bus reactive power compensation value to the electric energy conversion control unit of the side integrated device, and the electric energy conversion control unit controls the electric energy main circuit to send out reactive power to be compensated according to the bus reactive power compensation value, so that the reactive power on the bus is balanced.
4. When the coordinated control unit in the integrated device on the power generation side, the energy storage side or the load side monitors that the harmonic distortion rate on the bus exceeds a threshold value, for example, the standard frequency in the microgrid is 50Hz, the waveform is a sine wave and is called a fundamental wave, and the frequency greater than 50Hz is called a harmonic wave, so that the threshold value of the harmonic distortion rate can be set to be 50 Hz. However, some loads may generate harmonics when operating normally, and if the distortion rate of these harmonics exceeds the harmonic distortion rate of the microgrid, or if there are harmonics whose distortion rate exceeds a threshold value in the microgrid, the entire microgrid may be interfered with.
Therefore, the coordination control units on all sides of the scheme calculate the bus harmonic compensation value according to the harmonic distortion rate, the self electric energy capacity and the power generation state. The coordination control unit sends the calculated bus harmonic compensation value to the local side electric energy conversion control unit, and the electric energy conversion control unit controls the electric energy main circuit to send out harmonic compensation according to the bus harmonic compensation, so that the harmonic distortion rate on the bus is within a threshold value.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides an integrative device of control for microgrid sets up respectively in electricity generation side, energy storage side, load side, its characterized in that: integrative device is including integrative device, the integrative device of energy storage side, the integrative device of load side of the side of generating electricity, and every integrative device includes control module, electric energy main circuit, control module includes:
the electric energy conversion control unit is used for controlling the electric energy main circuit to complete conversion between direct current and alternating current;
the redundancy capacity control unit is used for sharing the control requirements of overflow of the electric energy conversion control unit and the coordination control unit according to the control task conditions of the electric energy conversion control unit and the coordination control unit;
the coordination control unit is used for calculating the received data so as to obtain a coordination control strategy; the cooperative control strategy comprises a strategy for scheduling the power of the microgrid and a strategy for governing harmonic waves in the microgrid;
the electric energy main circuit is electrically connected with the microgrid alternating current bus and used for completing conversion between direct current and alternating current according to the control of the electric energy conversion control unit.
2. The integrated monitoring device for the microgrid of claim 1, wherein: the integrated devices further comprise a communication module, the communication module comprises a wireless communication unit, and each integrated device is communicated with the other integrated devices through the wireless communication unit, so that the coordination control unit receives data sent by other integrated devices through the wireless communication unit.
3. The integrated monitoring device for the microgrid of claim 2, wherein: the communication module further comprises a wired communication unit, and each integrated device is connected with the microgrid communication bus through the wired communication unit, so that the coordination control unit interacts data with the microgrid central control system through the microgrid communication bus.
4. The integrated monitoring device for the microgrid of claim 1, wherein: the integrated device also comprises a power module, a protection circuit and an interaction device; the power supply module is used for supplying power to the control module, the communication module and the interaction equipment; the protection circuit is used for protecting the integrated device when the power supply module provides overvoltage or overcurrent; the interaction device comprises a touch screen and a data access interface, and is used for interacting with a user.
5. A distributed control method for a microgrid is characterized in that: the method comprises the following steps:
the method comprises the following steps that integrated devices are arranged on a power generation side, an energy storage side and a load side respectively, each integrated device comprises a control module, and each control module comprises an electric energy conversion control unit, a coordination control unit and a redundancy capacity control unit;
the electric energy conversion control unit controls the electric energy main circuit to complete conversion between direct current and alternating current;
the coordination control unit calculates the received data to obtain a cooperative control strategy; the cooperative control strategy comprises a strategy for scheduling the power of the microgrid and a strategy for governing harmonic waves in the microgrid;
and the redundancy capacity control unit shares the control requirement of overflow of the electric energy conversion control unit and the coordination control unit according to the control task conditions of the electric energy conversion control unit and the coordination control unit.
6. The distributed control method for the microgrid of claim 5, wherein: the step of calculating the received data by the coordination control unit so as to obtain the cooperative control strategy comprises the following steps:
the method comprises the steps that a coordination control unit in an integrated device at an energy storage side monitors bus voltage levels at a power generation side and a load side in real time, when electric energy generated at the power generation side fluctuates and the generated energy at the power generation side is not matched with the electricity consumption at the load side, the coordination control unit of the integrated device at the energy storage side calculates the difference of bus active power and obtains an active power scheduling strategy; the difference of the bus active power is the bus active power at the power generation side minus the bus active power at the load side;
the coordination control unit of the energy storage side integrated device sends the obtained active power scheduling strategy to the electric energy conversion control unit of the energy storage side integrated device, and if the difference of the bus active power is a positive number, the electric energy conversion control unit controls the electric energy main circuit to absorb the active power on the bus; if the difference of the bus active power supply is negative, the electric energy conversion control unit controls the electric energy main circuit to send active power to the bus, so that the active power on the bus is balanced.
7. The distributed transformation method for a microgrid of claim 6, characterized in that:
if the difference of the bus active power calculated by the coordination control unit of the energy storage side integrated device exceeds the control power of the energy storage side, the coordination control unit sends an active power scheduling strategy to the coordination control unit of the power generation side integrated device or the coordination control unit of the load side integrated device;
and controlling the main circuit to send out or absorb active power to the bus by the electric energy conversion control unit on the power generation side and/or the electric energy conversion control unit on the load side so that the active power on the bus is balanced.
8. The distributed transformation method for a microgrid of claim 5, characterized in that: the step of calculating the received data by the coordination control unit so as to obtain the cooperative control strategy comprises the following steps:
a coordination control unit in the integrated device at the energy storage side monitors the bus voltage levels at the power generation side and the load side in real time, and when the bus reactive power at the power generation side and the bus reactive power at the load side are unbalanced, the coordination control unit of the integrated device at the energy storage side calculates the difference of the bus reactive power and obtains a reactive power scheduling strategy;
the coordination control unit of the energy storage side integrated device sends the obtained reactive power scheduling strategy to the coordination control unit of the power generation side integrated device, and the coordination control unit of the power generation side integrated device calculates a bus reactive power compensation value according to the received reactive power scheduling strategy, the self electric energy capacity and the power generation state;
and the electric energy conversion control unit controls the electric energy main circuit to generate reactive power to be compensated according to the bus reactive power compensation value, so that the reactive power on the bus is balanced.
9. A distributed transformation method for a microgrid according to claim 6 or 8, characterized in that: the method comprises the following steps that a coordinating control unit in the integrated device on the energy storage side monitors the bus voltage levels of the power generation side and the load side in real time, and comprises the following steps:
a coordination control unit in the integrated device on the power generation side acquires the bus voltage level on the power generation side in real time, and a coordination control unit in the integrated device on the load side acquires the bus voltage level on the load side in real time;
and the coordination control unit in the integrated device on the energy storage side is in communication connection with the integrated device on the power generation side and the integrated device on the load side through the wireless communication unit respectively, so that the coordination control unit of the integrated device on the energy storage side monitors the bus voltage levels on the power generation side and the load side in real time, and the bus active power or/and reactive power on the power generation side and the load side are obtained.
10. The distributed transformation method for a microgrid of claim 5, characterized in that: the step of calculating the received data by the coordination control unit so as to obtain the cooperative control strategy comprises the following steps:
a coordination control unit in the integrated device on the power generation side acquires the bus voltage level on the power generation side in real time, a coordination control unit in the integrated device on the energy storage side acquires the bus voltage level on the power generation side in real time, and a coordination control unit in the integrated device on the load side acquires the bus voltage level on the load side in real time;
when the coordination control unit monitors that the harmonic distortion rate on the bus exceeds a threshold value, the coordination control unit calculates a bus harmonic compensation value according to the harmonic distortion rate, the self electric energy capacity and the power generation state;
the coordination control unit sends the calculated bus harmonic compensation value to the electric energy conversion control unit on the side, and the electric energy conversion control unit controls the electric energy main circuit to send out harmonic compensation according to the bus harmonic compensation value, so that the harmonic distortion rate on the bus is within a threshold value.
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