CN111555365A - Control method and control device of micro-grid system and micro-grid system - Google Patents

Control method and control device of micro-grid system and micro-grid system Download PDF

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Publication number
CN111555365A
CN111555365A CN202010295493.1A CN202010295493A CN111555365A CN 111555365 A CN111555365 A CN 111555365A CN 202010295493 A CN202010295493 A CN 202010295493A CN 111555365 A CN111555365 A CN 111555365A
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mode
converter
operation mode
diesel generator
power generation
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CN202010295493.1A
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CN111555365B (en
Inventor
王健
徐光福
侯炜
陈俊
朱皓斌
王晨
徐天乐
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering 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
    • H02J3/38—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
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application provides a control method and a control device of a micro-grid system, the micro-grid system, electronic equipment and a computer readable medium. The control method comprises the following steps: the operation modes of the micro-grid system comprise one or more of a first operation mode, a second operation mode, a third operation mode and a fourth operation mode which can be switched; when the micro-grid system is in a first operation mode, the energy storage device is operated as a main power supply; enabling the DC/DC converter to operate in a constant voltage mode, and controlling the voltage of a direct current bus; enabling the new energy power generation equipment to operate in a maximum power tracking state; operating the DC/AC converter in a Virtual Synchronous Generator (VSG) mode, and controlling the voltage and the frequency of an alternating current bus; operating the diesel generator in a constant power mode under control of the DC/AC converter. The running mode of the diesel generator is controlled through the DC/AC converter, and the running reliability and economy of the micro-grid system are improved.

Description

Control method and control device of micro-grid system and micro-grid system
Technical Field
The present application relates to the field of microgrid technologies, and in particular, to a microgrid control method, a microgrid control device, a microgrid system, an electronic device, and a computer-readable medium.
Background
Due to geographical positions of islands and remote areas, power transmission lines are difficult to erect and high in cost, existing power grids are difficult to cover, and users face the problem of difficulty in power utilization. At present, a diesel generator is mostly adopted for supplying power, the operation cost is high, the electric energy quality is poor, long-time stable and reliable power supply cannot be guaranteed, and the production and life of local users are seriously influenced.
In consideration of the fact that wind and light resources in the regions are rich, the new energy is fully utilized, electricity utilization cost of users can be reduced, economic benefits are improved, and reliability and continuity of electricity utilization of the users can be guaranteed by the energy storage device. Therefore, the independent alternating current and direct current hybrid micro-grid system and the control method thereof are provided, and the system is suitable for practical engineering application.
Disclosure of Invention
The application aims to provide a control method of a micro-grid system, which directly controls the operation mode of a diesel generator through a DC/AC converter, so that new energy resources are fully utilized, and the power utilization reliability and the economy are improved.
According to an aspect of the present application, there is provided a control method of a microgrid system including,
a diesel generator;
the DC/AC converter is connected with the diesel generator;
the control device is connected with the diesel generator;
the alternating current bus is connected with the diesel generator;
the direct current bus is connected with the alternating current bus through the DC/AC converter;
the energy storage equipment is connected with the direct current bus through a DC/DC converter;
the new energy power generation equipment is connected with the direct current bus;
the operation modes of the microgrid system comprise one or more of a first operation mode, a second operation mode, a third operation mode and a fourth operation mode which can be switched with each other;
when the microgrid system is in a first operation mode, the control method comprises the following steps:
operating the energy storage device as a primary power source;
operating the DC/AC converter in a Virtual Synchronous Generator (VSG) mode, and controlling the voltage and the frequency of an alternating current bus;
enabling the DC/DC converter to operate in a constant voltage mode, and controlling the voltage of a direct current bus;
enabling the new energy power generation equipment to operate in a maximum power tracking state;
operating the diesel generator in a constant power mode under control of the DC/AC converter.
Further, the new energy power generation apparatus includes: wind power plants and/or photovoltaic power plants.
According to some embodiments of the present application, when the microgrid system is in a second operating mode, the control method further comprises:
operating the energy storage device as a primary power source;
operating the DC/AC converter in a Virtual Synchronous Generator (VSG) mode, and controlling the voltage and the frequency of an alternating current bus;
enabling the DC/DC converter to operate in a constant voltage mode, and controlling the voltage of a direct current bus;
enabling the new energy power generation equipment to operate in a maximum power tracking state;
the diesel generator is put into a shutdown state.
According to some embodiments of the present application, when the microgrid system is in a third operating mode, the control method further comprises:
the diesel generator is used as a main power supply to operate in a constant voltage mode, and the voltage and the frequency of an alternating current bus are controlled;
and the energy storage equipment and the new energy power generation equipment are in a shutdown state.
According to some embodiments of the present application, when the microgrid system is in a fourth operating mode, the control method further comprises:
operating the DC/AC converter in a voltage source mode, and controlling the voltage of the direct current bus;
the DC/AC converter opens the first switch output node, so that the diesel generator runs in a constant voltage mode and is used as a main power supply to control the voltage and the frequency of an alternating current bus;
operating the DC/DC converter in a constant power mode, and charging the energy storage device by the system;
when the energy storage device charge is greater than the lowest charge of the second DC/DC converter constant voltage mode, the DC/DC converter switches to the constant voltage mode.
According to some embodiments of the application, the control method further comprises:
the DC/AC converter controls the running mode of the diesel generator through the first switch output node;
closing the first switching output node if and only if the DC/AC converter is operating in VSG mode such that the diesel generator is operating in constant power mode;
when the DC/AC converter operates in other modes, the first switch output node is opened, and the diesel generator operates in a constant voltage mode;
the control device controls the start and stop of the diesel generator through the second switch output node.
According to some embodiments of the application, the control method further comprises:
in a second operation mode, when the charge of the energy storage device is larger than the high-capacity charge, the control device stops the new energy power generation device;
when the charge of the energy storage device is smaller than the starting charge of the photovoltaic power generation device, the control device starts the photovoltaic power generation device;
and when the charge of the energy storage device is smaller than the starting charge of the wind power generation device, the control device starts the wind power generation device.
According to some embodiments of the application, the control method further comprises:
in the second operation mode, when the photovoltaic power generation equipment and the wind power generation equipment normally operate, the sum of the maximum power generation power allowed by the wind power generation and the photovoltaic power generation and the power target values of the wind power generation and the photovoltaic power generation meet the following conditions:
Ptotal＝Pload+min(Pmax_charge,Pset_charge)
Figure BDA0002452033250000041
Ppv＝min(Ptotal-Pwind,Ppv_set)
wherein, PtotalThe maximum generating power sum allowed for wind power generation and photovoltaic power generation; ploadIs the load power; pmax_chargeMaximum charge power allowed for the battery; pset_chargeMaximum charging power allowed for the second DC/DC converter, PwindThe active power target value of the wind power generation DC/DC converter; pwind_setRated active power for the wind power generation DC/DC converter; ppvThe active power target value of the photovoltaic power generation DC/DC converter is obtained; ppv_setRated active power for a photovoltaic DC/DC converterAnd (4) rate.
According to some embodiments of the application, the control method further comprises:
in the first operation mode, when the charge of the energy storage device is smaller than the starting charge of the diesel generator, the control device closes the second switch output node to start the diesel generator, and the system enters the second operation mode;
after the diesel generator automatically completes synchronization grid connection, the diesel generator is controlled to be switched to a constant power mode according to the running mode of the DC/AC converter;
in the second operation mode, when the charge of the energy storage device is larger than the starting charge of the diesel generator, the control device opens the second switch output node, closes the diesel generator, and the system enters the first operation mode.
According to some embodiments of the application, the control method further comprises:
the micro-grid system is in a full power-off state and enters the second operation mode or the third operation mode through a first starting mode;
when the charge of the energy storage equipment is smaller than the lowest charge of the constant voltage mode of the DC/DC converter in the second operation mode, the microgrid system enters a fourth operation mode through a second starting mode;
when the micro-grid system is in an operating state, the micro-grid system enters a full-stop power-off state through manual shutdown equipment.
Further, entering the second operating mode via the first start-up mode comprises:
the DC/DC converter and the DC/AC converter are enabled for startup;
the control device issues a starting instruction to the second DC/DC converter;
the DC/DC converter executes a start-up instruction;
after the DC/DC converter is started successfully and the DC/AC converter returns a signal, the control device issues a first starting instruction to the DC/AC converter, the DC/AC converter is started, and the system enters a second operation mode.
Further, entering the third operating mode via the first start-up mode includes:
when the energy storage equipment fails, the diesel generator is allowed to start;
the control device closes the second switch output node and starts the diesel generator;
and the diesel generator normally operates, and the system enters a third operation mode.
Further, entering the fourth operating mode via a second start-up mode includes:
the diesel generator, the DC/DC converter, the DC/AC converter are enabled to start;
the control device closes the second switch output node, starts the diesel generator, and the diesel generator normally operates in a constant voltage mode;
the DC/AC converter returns a signal for allowing direct current constant voltage starting;
the control device issues a direct-current constant-voltage starting instruction to the DC/AC converter, and the DC/AC converter normally operates in a voltage source mode;
the DC/DC converter returns a start-enabling signal;
and the control device issues a mode instruction and a starting instruction to the DC/DC converter, the DC/DC converter normally operates in a constant power mode, and the system enters a fourth operation mode.
According to another aspect of the present application, there is provided a control apparatus of a microgrid system, comprising:
a first operation module: when the micro-grid system meets a first operation mode condition, controlling the micro-grid system to operate in the first operation mode;
a second operation module: when the micro-grid system meets a second operation mode condition, controlling the micro-grid system to operate in a second operation mode;
a third operation module: when the micro-grid system meets a third operation mode condition, controlling the micro-grid system to operate in a third operation mode;
a fourth operation module: when the micro-grid system meets a fourth operation mode condition, controlling the micro-grid system to operate in a fourth operation mode;
a first start module: the micro-grid system is in a full power-off state and enters the second operation mode or the third operation mode through a first starting mode;
a second starting module: and when the charge of the energy storage device is smaller than the lowest charge of the constant voltage mode of the second DC/DC converter in the second operation mode, the microgrid system enters the fourth operation mode through the second starting mode.
According to another aspect of the present application, there is provided a microgrid system comprising:
a diesel generator;
the DC/AC converter is connected with the diesel generator through a cable and controls the running mode of the diesel generator;
the control device is connected with the diesel generator through a cable and controls the starting and stopping of the diesel generator;
the alternating current bus is connected with the diesel generator;
the direct current bus is connected with the alternating current bus through the DC/AC converter;
the new energy power generation equipment is connected with the direct current bus through a first DC/DC converter;
and the energy storage equipment is connected with the direct current bus through a second DC/DC converter.
Furthermore, the control device is in information interaction with the diesel generator, the first DC/DC converter, the second DC/DC converter and the DC/AC converter through communication lines.
According to some embodiments of the application, the modes of operation of the microgrid system comprise:
one or more of a first operation mode, a second operation mode, a third operation mode and a fourth operation mode which are mutually switchable.
According to some embodiments of the application, the control method comprises the following steps:
a first start-up mode and/or a second start-up mode.
According to another aspect of the present application, an electronic device includes:
one or more processors;
storage means for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the control method described above.
According to another aspect of the present application, there is provided a computer-readable medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements the control method described above.
According to the microgrid control method, the operation mode of the diesel generator is directly controlled through the DC/AC converter, so that new energy resources are fully utilized, and the power utilization reliability and economy are improved. The micro-grid system provided by the application has the black start and emergency start functions, can switch states among a new energy running mode, a hybrid running mode, a diesel engine running mode and an emergency mode, and is suitable for various system working conditions.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application.
Fig. 1 shows a schematic diagram of a microgrid system composition according to an exemplary embodiment of the present application.
Fig. 2 illustrates a schematic diagram of an operation mode of a microgrid system according to an exemplary embodiment of the present application.
Fig. 3 shows a flowchart of a microgrid system control method according to a first exemplary embodiment of the present application.
Fig. 4 shows a flowchart of a microgrid system control method according to a second exemplary embodiment of the present application.
Fig. 5 shows a flowchart of a microgrid system control method according to a third exemplary embodiment of the present application.
Fig. 6 shows a block diagram of a microgrid system control apparatus according to an exemplary embodiment of the present application.
Fig. 7 shows a microgrid system control electronics block diagram according to an example embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
It will be understood that, although the terms first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first component discussed below may be termed a second component without departing from the teachings of the present concepts. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Those skilled in the art will appreciate that the drawings are merely schematic representations of exemplary embodiments, which may not be to scale. The blocks or flows in the drawings are not necessarily required to practice the present application and therefore should not be used to limit the scope of the present application.
In existing microgrid systems, the diesel generator and the DC/AC controller are independent of each other. Therefore, during operation, the operation of the diesel generator is not well matched to the DC/AC controller. In view of the above technical problems, the present inventors propose a microgrid system, which connects a DC/AC controller with a diesel generator through a cable and controls an operation mode of the diesel generator to be more matched with the operation of the entire system, thereby improving the operation stability and economy of the system.
The technical solution of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a microgrid system composition according to an exemplary embodiment of the present application.
The microgrid system 1000 provided by the application comprises a diesel generator 100, a DC/AC converter 200, an alternating current bus 300, a direct current bus 400, a new energy power generation device 500 and an energy storage device 600.
An alternating current bus 300 is connected with the diesel generator 100; the DC/AC converter 200 is connected to the diesel generator 100 by a cable, and controls the operation mode of the diesel generator 100 through its own first switching output node. The DC bus 400 is connected to the AC bus 300 via the DC/AC converter 200. The new energy power generation device 500 and the energy storage device 600 are respectively connected with the direct current bus 400.
The control process of the DC/AC converter 200 on the diesel generator 100 is as follows: if and only if the DC/AC converter 200 is operating in the virtual generator VSG mode, the first switching output node of the DC/AC converter 200 itself is closed and the signal is transmitted to the input node of the diesel generator 100 controller through the cable connected between the two. After detecting that the node is closed, the controller of the diesel generator 100 switches the operation mode of the controller from the constant voltage mode to the constant power mode. When the DC/AC converter 200 is operating in the other mode, the first switching output node is open and the diesel generator is normally operating in the constant voltage mode.
The new energy power generation apparatus 500 includes a new energy power generation device 510 and a corresponding first DC/DC converter 520. The energy storage apparatus 600 comprises an energy storage device 610 and a corresponding second DC/DC converter 620. The new energy power generation device 510 is connected to the DC bus 400 via the first DC/DC converter 520. The energy storage device 610 is connected to the DC bus 400 via a second DC/DC converter 620. The new energy power generation device 510 may be a wind power generation device 511 and/or a photovoltaic power generation device 512, but the present application is not limited thereto.
Furthermore, the microgrid system 1000 also includes a control device 700 (e.g., a microgrid controller), a battery management system (not shown), and an electrical load terminal 800 (e.g., an ac load). The control device 700 is connected with the diesel generator 100 through a cable, and controls the start and stop of the diesel generator 100 through a second switch output node. The control device 700 performs information interaction with the diesel generator 100, the first DC/DC converter 520, the second DC/DC converter 620, and the DC/AC converter 200 through communication lines. The battery management system 800 performs information interaction with the control device 700 through a communication line. The electrical load terminal 900 is connected to the ac busbar 300.
Fig. 2 illustrates a schematic diagram of an operation mode of a microgrid system according to an exemplary embodiment of the present application.
As shown in fig. 2, the micro-grid system 1000 provided by the present application operates under the coordinated control of the control device 700 in the following modes: one or more of a first mode of operation, a second mode of operation, a third mode of operation, and a fourth mode of operation. For example, the first mode of operation may be a wind, light, and diesel storage and transportation mode. In the first operation mode, the energy storage device 610 operates as a main power source, new energy devices such as the wind power generation device 511 and the photovoltaic power generation device 512 operate in a maximum power tracking state, and the diesel generator 100 is in a constant power operation mode. The second mode of operation may be a wind-solar-storage mode of operation. In the second operation mode, the energy storage device 610 operates as a main power source, new energy devices such as the wind power generation device 511 and the photovoltaic power generation device 512 operate in a maximum power tracking state, and the diesel generator 100 is in a shutdown state. The third mode of operation may be a diesel mode of operation; in the third operation mode, the diesel generator 100 is used as a main power source, and the energy storage device 610 and the new energy power generation device 510 are in a shutdown state. The fourth operation mode may be an emergency operation mode, which is an emergency processing mode for charging the battery of the energy storage device 610 through the diesel generator 100 when the battery of the energy storage device 610 is low.
In the above operation mode, the first operation mode is an operation mode in a steady state of the microgrid system. In the mode, the new energy is fully utilized to generate electricity, and the diesel oil consumption is saved. The above-described operating modes may be switched before. For example, between the first operation mode and the second operation mode, the switching can be performed according to the charge condition of the energy storage device.
Further, the startup modes of the microgrid system 1000 include a first startup mode and/or a second startup mode. The first start-up mode may be a "black start". The 'black start' means that after the whole system is shut down due to a fault, the microgrid system is completely powered off and is in a full 'black' state, other network help is not relied on, a generator set with self-starting capability in the system is started to drive the generator set without the self-starting capability, the system recovery range is gradually expanded, and finally the recovery of the whole system is realized.
The second startup mode may be "emergency startup". The emergency starting mode is an emergency processing mode of charging the battery of the energy storage equipment through the diesel generator under the condition that the electric quantity of the battery of the energy storage equipment is low. In the emergency starting process, after the system needs to be switched to a full power-off state (namely, the alternating current bus and the direct current bus have no voltage, and the photovoltaic power generation equipment, the wind power generation equipment, the DC/DC converter, the DC/AC converter and the diesel generator all stop running), the system is switched to a fourth running mode through emergency starting. The difference between "emergency start" and "black start" is the way the system operates after start.
The switching process of various operation modes of the micro-grid system is shown in fig. 2:
when the micro-grid system is in a full power-off state, the micro-grid system enters a second operation mode (such as a wind-solar energy storage operation mode) or a third operation mode (a diesel power generation operation mode) through black start under a normal working condition. And entering a fourth operation mode, such as an emergency operation mode, through emergency starting under the emergency working condition. Specifically, the energy storage device enters a diesel engine running mode when in a fault state, and enters a second running mode, such as a wind-solar energy storage running mode, when in a normal state. And in the second operation mode, when the charge of the energy storage device is smaller than the charge of the diesel generator in the starting state, the diesel generator is started, and the system enters the first operation mode, such as a wind, light and diesel storage and transportation mode. In the first operation mode, when the charge of the energy storage device is larger than the charge of the starting state of the diesel generator, the diesel generator is closed, and the system enters a second operation mode. When the micro-grid system is in an operating state, the micro-grid system can enter a full-stop power-off state through manual shutdown equipment.
Fig. 3 shows a flowchart of a microgrid system control method according to a first exemplary embodiment of the present application.
As shown in fig. 3, according to another aspect of the present application, there is provided a control method of the above-mentioned microgrid system 1000, including:
in step S310, the microgrid system is in a full power-off state, and enters the second operation mode or the third operation mode through the first start-up mode.
When the system is completely stopped and loses power, the first starting process, namely the black starting process, can be completed through a 'starting' button by one key. Wherein the process of entering the second operation mode is as follows: when the second DC/DC converter and the DC/AC converter are allowed to start, the 'black start ready' lamp of the microgrid controller is turned on. And when a start button is pressed, the microgrid controller firstly sends a start instruction to the second DC/DC converter. After the second DC/DC converter is started successfully and a signal of 'allowing black start' of the DC/AC converter returns, the microgrid controller issues a 'black start' instruction to the energy storage DC/AC converter until the DC/AC converter is started successfully and the 'black start' is finished, and the system is switched to a second operation mode, namely a wind and light storage operation mode.
The process of entering the third operating mode is: when the energy storage equipment is in failure and the diesel generator is allowed to start, the 'black start ready' lamp of the microgrid controller is turned on. And pressing a start button, closing a second switch output node of the microgrid controller, starting the diesel generator until the diesel generator normally operates, ending the black start, and switching the system to a third operation mode, namely a diesel engine running mode.
In step S320, when the energy storage device charge is less than the lowest charge of the second DC/DC converter in the constant voltage mode in the second operation mode, the microgrid system enters the fourth operation mode through the second start-up mode.
When the electric quantity of the battery of the energy storage device is extremely low and the second DC/DC converter cannot be started in the constant voltage mode, the fourth operation mode (emergency mode) can be entered through the second starting mode, namely emergency starting. In a fourth mode of operation, the diesel generator is used to generate electricity to charge the energy storage battery until the amount of electricity is sufficient to support the DC/DC converter to start up in constant voltage mode.
When the system enters the fourth running mode through the second starting mode, the emergency starting process is completed through the 'starting' button after the system needs to be switched to a full power-off state. The specific process is as follows: when the diesel generator, the second DC/DC converter and the DC/AC converter are allowed to start, the 'black start ready' lamp of the microgrid controller is turned on. And when a start button is pressed down, a second switch output node of the microgrid controller is closed, and the diesel generator is started. The diesel generator normally operates in a constant voltage mode, and after a direct current constant voltage starting permission signal of the DC/AC converter returns, the microgrid controller issues a direct current constant voltage starting instruction to the DC/AC converter. And after the energy storage DC/AC converter normally operates in a voltage source mode and a start-up allowing signal of the second DC/DC converter returns, the microgrid controller issues a mode command and a start-up command to the second DC/DC converter, the second DC/DC converter normally operates in a constant power mode, the emergency start is finished, and the system is switched to a fourth operation mode, namely an emergency mode.
In step S330, when the microgrid system is in an operating state, the microgrid system enters a full-power-off state through a manual shutdown device. No matter in first operating mode, second operating mode, third operating mode or fourth operating mode, can all pass through manual shutdown equipment for the system enters full power failure state of stopping.
Fig. 4 shows a flowchart of a microgrid system control method according to a second exemplary embodiment of the present application.
As shown in fig. 4, according to a second embodiment of the present application, a microgrid system control method provided by the present application includes:
in step S410, the operation mode of the microgrid system includes one or more of a first operation mode, a second operation mode, a third operation mode and a fourth operation mode which can be switched. The microgrid system provided by the application can be started through a control method as shown in fig. 3. In the operation process, the switching between the operation modes can be carried out according to the actual operation condition.
In step S420, when the microgrid system is in a first operation mode, operating an energy storage device as a main power supply; the DC/AC converter runs in a virtual synchronous generator VSG mode and controls the voltage and the frequency of an alternating current bus; the second DC/DC converter operates in a constant voltage mode and controls the voltage of the direct current bus; the new energy power generation equipment operates in a maximum power tracking state; the diesel generator operates in a constant power mode under the control of the DC/AC converter.
The first operation mode, namely the wind, light and diesel storage and transportation mode, is an operation mode of the microgrid system in a stable state. In the mode, the new energy is fully utilized to generate electricity, and the diesel oil consumption is saved. The above-described operating modes may be switched before. The new energy power plant may comprise a wind power plant and/or a photovoltaic power plant. And when the DC/AC converter operates in a virtual synchronous generator VSG mode, the first switch output node of the DC/AC converter is closed, so that the diesel generator operates in a constant power mode.
Fig. 5 shows a flowchart of a microgrid system control method according to a third exemplary embodiment of the present application.
As shown in fig. 5, according to a third embodiment of the present application, the microgrid system control method provided by the present application includes, in addition to the steps shown in fig. 4:
in step S430, when the microgrid system is in a second operation mode, operating an energy storage device as a main power supply; the DC/AC converter runs in a virtual synchronous generator VSG mode and controls the voltage and the frequency of an alternating current bus; the second DC/DC converter operates in a constant voltage mode and controls the voltage of the direct current bus; the new energy power generation equipment operates in a maximum power tracking state; the diesel generator is in a shutdown state.
When the micro-grid system is in a second operation mode, when the charge of the energy storage device, namely the charge SOC of the battery of the energy storage device is more than SOChigh(high-power charge of the energy storage battery), the control device stops the wind power generation equipment and the photovoltaic power generation equipment, and the power of the battery of the energy storage equipment is gradually reduced along with the consumption of the load. When the charge SOC of the battery of the energy storage equipment is less than SOCstart_pv(photovoltaic power generation equipment starts electric charge), the control device starts the photovoltaic power generation equipment. If the electric quantity of the energy storage battery is further reduced, when the charge SOC of the energy storage battery is less than SOCstart_wind(when the wind power generation equipment starts the charge), the control device starts the wind power generation equipment.
When the photovoltaic power generation equipment and the wind power generation equipment normally operate, the sum of the maximum power generation power allowed by the wind power generation and the photovoltaic power generation and the power target values of the wind power generation and the photovoltaic power generation meet the following operating conditions:
Ptotal＝Pload+min(Pmax_charge,Pset_charge)
Figure BDA0002452033250000141
Ppv＝min(Ptotal-Pwind,Ppv_set)
wherein, PtotalThe maximum generating power sum allowed for wind power generation and photovoltaic power generation; ploadIs the load power; pmax_chargeMaximum charge power allowed for the battery; pset_chargeMaximum charging power allowed for the second DC/DC converter, PwindThe active power target value of the wind power generation DC/DC converter; pwind_setRated active power for the wind power generation DC/DC converter; ppvThe active power target value of the photovoltaic power generation DC/DC converter is obtained; ppv_setRated active power for photovoltaic power generation DC/DC converterAnd (4) power.
The microgrid system is switchable between a first mode of operation and a second mode of operation. When the microgrid system is in a first operation mode, the energy storage equipment operates as a main power supply, the energy storage DC/DC converter operates in a constant voltage mode to control the voltage of a direct current bus, the energy storage DC/AC converter operates in a virtual synchronous generator VSG mode to control the voltage and the frequency of an alternating current bus, and the wind power generation equipment and the photovoltaic power generation equipment are in a maximum power point tracking state. When the charge SOC of the energy storage device is less than SOCstart_diesel(diesel generator start charge), the microgrid controller closes the second switch output node to start the diesel generator. The diesel generator automatically completes synchronous grid connection, and is switched to a constant power operation mode according to the operation mode of the DC/AC converter at the moment, and the active power target value is issued by the microgrid controller.
In the second operation mode, when the charge of the energy storage device is larger than the starting charge of the diesel generator, namely SOC is more than SOCstop_dieselAnd when the system is in the first running mode, the control device turns on the second switch output node, turns off the diesel generator and enables the system to enter the first running mode.
In step S440, when the microgrid system is in a third operation mode, operating the diesel generator as a main power supply in a constant voltage mode, and controlling the voltage and frequency of the ac bus; the energy storage device and the new energy power generation device are in a shutdown state.
In a third operation mode, namely a diesel engine operation mode, the diesel generator operates as a main power supply, the energy storage equipment, the wind power generation equipment and the photovoltaic power generation equipment stop operating, and the diesel generator operates in a constant voltage mode, controls the voltage and the frequency of the alternating current bus and supplies power to a user load.
In step S450, when the microgrid system is in a fourth operating mode, the diesel generator operates in a constant voltage mode, the DC/AC converter operates in a voltage source mode, and the second DC/DC converter operates in a constant power mode.
In a fourth mode of operation, the DC/AC converter operates in a voltage source mode, controlling the voltage of the DC bus. The DC/AC converter turns on the first switch output nodeThe point is to operate the diesel generator in a constant voltage mode, controlling the voltage and frequency of the ac bus as the main power source. The second DC/DC converter operates in a constant power mode, and the system charges the energy storage equipment until the charge SOC of the energy storage equipment is more than SOCstop_dcdcWherein SOC isstop_dcdcThe second DC/DC converter may be operated at a minimum battery state of charge corresponding to the constant voltage mode. The second DC/DC converter switches to a constant voltage mode.
In the above control process, the DC/AC converter controls the operation mode of the diesel generator. The DC/AC converter controls the operation mode of the diesel generator through a first switch output node; closing the first switching output node if and only if the DC/AC converter is operating in VSG mode such that the diesel generator is operating in constant power mode; when the DC/AC converter operates in other modes, the first switch output node is opened, and the diesel generator operates in a constant voltage mode.
The control device controls the start and stop of the diesel generator through a second switch output node of the control device. When the second switching output node is closed, the diesel generator is started. When the second switch output node is opened, the diesel generator stops running.
Fig. 6 shows a block diagram of a microgrid system control apparatus according to an exemplary embodiment of the present application.
As shown in fig. 6, the present application further provides a microgrid system control apparatus 600, which includes a first operation module 610, a second operation module 620, a third operation module 630, a fourth operation module 640, a first start module 650, and a second start module 660.
A first operation module 610, configured to control the microgrid system to operate in a first operation mode when the microgrid system meets a first operation mode condition. The first operation mode can be a wind-solar-diesel-storage mode, the second DC/DC converter operates in a constant voltage mode, the DC/AC converter operates in a virtual synchronous generator VSG mode, the wind power generation equipment and the photovoltaic power generation equipment are in a maximum power point tracking state, and the diesel generator operates in a constant power mode.
And a second operation module 620, configured to control the microgrid system to operate in a second operation mode when the microgrid system meets a second operation mode condition. The second operation mode can be a wind-solar energy storage operation mode, the second DC/DC converter operates in a constant voltage mode, the DC/AC converter operates in a virtual synchronous generator VSG mode, the wind power generation equipment and the photovoltaic power generation equipment are in a maximum power point tracking state, and the diesel generator is in a shutdown state.
A third operation module 630, configured to control the microgrid system to operate in a third operation mode when the microgrid system meets a third operation mode condition. The third operating mode may be a diesel engine operating mode, the energy storage device, the wind power generation device and the photovoltaic power generation device are stopped from operating, and the diesel generator is operated in a constant voltage mode.
A fourth operation mode 640, configured to control the microgrid system to operate in a fourth operation mode when the microgrid system meets a fourth operation mode condition; the fourth mode of operation may be an emergency mode of operation, with the diesel generator operating in a constant voltage mode, the DC/AC converter operating in a voltage source mode, and the second DC/DC converter operating in a constant power mode.
And the first starting module 650 is configured to enable the microgrid system to be in a full power-off state, and enter the second operation mode or the third operation mode through the first starting mode.
And the second starting module 660 is configured to, in the second operation mode of the microgrid system, enter the fourth operation mode through the second starting mode when the charge of the energy storage device is less than the lowest charge of the constant voltage mode of the second DC/DC converter.
Fig. 7 shows a microgrid system control electronics composition diagram according to an example embodiment of the present application.
As shown in fig. 7, the present application further provides an electronic device 700 for microgrid system control. The control device 700 shown in fig. 7 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
As shown in fig. 7, the control device 700 is in the form of a general purpose computing device. The components of the control device 700 may include, but are not limited to: at least one processing unit 710, at least one memory unit 720, a bus 730 that couples various system components including the memory unit 720 and the processing unit 710, and the like.
The storage unit 720 stores program codes, which can be executed by the processing unit 710 to cause the processing unit 710 to execute the methods according to the above-mentioned embodiments of the present application described in the present specification.
The storage unit 720 may include readable media in the form of volatile memory units, such as a random access memory unit (RAM)7201 and/or a cache memory unit 7202, and may further include a read only memory unit (ROM) 7203.
The storage unit 720 may also include a program/utility 7204 having a set (at least one) of program modules 7205, such program modules 7205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
Bus 730 may be any representation of one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.
The electronic device 700 may also communicate with one or more external devices 7001 (e.g., touch screen, keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device 700, and/or with any devices (e.g., router, modem, etc.) that enable the electronic device 700 to communicate with one or more other computing devices. Such communication may occur via an input/output (I/O) interface 750. Also, the electronic device 700 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the internet) via the network adapter 760. The network adapter 760 may communicate with other modules of the electronic device 700 via the bus 730. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the electronic device 700, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
Further, the present application provides a computer-readable medium on which a computer program is stored, wherein the program is characterized by implementing the above-described control method when executed by a processor.
The utility model provides a little electric wire netting control system possesses black start, emergent start function, can carry out the state switch between new forms of energy operational mode, hybrid operation mode, diesel engine operation mode and emergency mode, is applicable to various system operating modes. The application provides a little electric wire netting control system control method through the operation mode of DC/AC converter direct control diesel generator for new energy resource obtains make full use of, power consumption reliability and economic nature that have improved.
It should be understood that the above examples are only for clearly illustrating the present application and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of this invention may be made without departing from the spirit or scope of the invention.

Claims (20)

1. A control method of a micro-grid system comprises the following steps,
a diesel generator;
the DC/AC converter is connected with the diesel generator;
the control device is connected with the diesel generator;
the alternating current bus is connected with the diesel generator;
the direct current bus is connected with the alternating current bus through the DC/AC converter;
the energy storage equipment is connected with the direct current bus through a DC/DC converter;
the new energy power generation equipment is connected with the direct current bus;
it is characterized in that the preparation method is characterized in that,
the operation modes of the micro-grid system comprise one or more of a first operation mode, a second operation mode, a third operation mode and a fourth operation mode which can be switched,
when the microgrid system is in a first operation mode, the control method comprises the following steps:
operating the energy storage device as a primary power source;
operating the DC/AC converter in a Virtual Synchronous Generator (VSG) mode, and controlling the voltage and the frequency of an alternating current bus;
enabling the DC/DC converter to operate in a constant voltage mode, and controlling the voltage of a direct current bus;
enabling the new energy power generation equipment to operate in a maximum power tracking state;
operating the diesel generator in a constant power mode under control of the DC/AC converter.
2. The control method according to claim 1, characterized in that the new energy power generation device includes:
wind power plants and/or photovoltaic power plants.
3. The control method of claim 1, wherein when the microgrid system is in a second mode of operation, the control method further comprises:
operating the energy storage device as a primary power source;
operating the DC/AC converter in a Virtual Synchronous Generator (VSG) mode, and controlling the voltage and the frequency of an alternating current bus;
enabling the DC/DC converter to operate in a constant voltage mode, and controlling the voltage of a direct current bus;
enabling the new energy power generation equipment to operate in a maximum power tracking state;
the diesel generator is put into a shutdown state.
4. The control method of claim 1, wherein when the microgrid system is in a third mode of operation, the control method further comprises:
the diesel generator is used as a main power supply to operate in a constant voltage mode, and the voltage and the frequency of an alternating current bus are controlled;
and the energy storage equipment and the new energy power generation equipment are in a shutdown state.
5. The control method of claim 1, wherein when the microgrid system is in a fourth mode of operation, the control method further comprises:
operating the DC/AC converter in a voltage source mode, and controlling the voltage of the direct current bus;
the DC/AC converter opens the first switch output node, so that the diesel generator runs in a constant voltage mode and is used as a main power supply to control the voltage and the frequency of an alternating current bus;
operating the DC/DC converter in a constant power mode, and charging the energy storage device by the system;
when the charge of the energy storage device is larger than the lowest charge of the constant voltage mode of the DC/DC converter, the DC/DC converter is switched to the constant voltage mode.
6. The control method according to claim 5, characterized by further comprising:
the DC/AC converter controls the running mode of the diesel generator through the first switch output node;
closing the first switching output node if and only if the DC/AC converter is operating in VSG mode such that the diesel generator is operating in constant power mode;
when the DC/AC converter operates in other modes, the first switch output node is opened, and the diesel generator operates in a constant voltage mode.
The control device controls the start and stop of the diesel generator through the second switch output node.
7. The control method according to claim 3, characterized by further comprising:
in a second operation mode, when the charge of the energy storage device is larger than the high-capacity charge, the control device stops the new energy power generation device;
when the charge of the energy storage device is smaller than the starting charge of the photovoltaic power generation device, the control device starts the photovoltaic power generation device;
and when the charge of the energy storage device is smaller than the starting charge of the wind power generation device, the control device starts the wind power generation device.
8. The control method according to claim 7, characterized by further comprising:
in the second operation mode, when the photovoltaic power generation equipment and the wind power generation equipment normally operate, the sum of the maximum power generation power allowed by the wind power generation and the photovoltaic power generation and the power target values of the wind power generation and the photovoltaic power generation meet the following conditions:
Ptotal＝Pload+min(Pmax_charge,Pset_charge)
Figure FDA0002452033240000031
Ppv＝min(Ptotal-Pwind,Ppv_set)
wherein, PtotalThe maximum generating power sum allowed for wind power generation and photovoltaic power generation; ploadIs the load power; pmax_chargeMaximum charge power allowed for the battery; pset_chargeMaximum charging power allowed for DC/DC converter, PwindThe active power target value of the wind power generation DC/DC converter; pwind_setRated active power for the wind power generation DC/DC converter; ppvThe active power target value of the photovoltaic power generation DC/DC converter is obtained; ppv_setThe rated active power of the photovoltaic power generation DC/DC converter.
9. The control method according to claim 3, characterized by further comprising:
in the first operation mode, when the charge of the energy storage device is smaller than the starting charge of the diesel generator, the control device closes the second switch output node to start the diesel generator, and the system enters the second operation mode;
after the diesel generator automatically completes synchronization grid connection, the diesel generator is controlled to be switched to a constant power mode according to the running mode of the DC/AC converter;
in the second operation mode, when the charge of the energy storage device is larger than the starting charge of the diesel generator, the control device opens the second switch output node, closes the diesel generator, and the system enters the first operation mode.
10. The control method according to any one of claims 1 to 9, characterized by further comprising:
the micro-grid system is in a full power-off state and enters the second operation mode or the third operation mode through a first starting mode;
when the charge of the energy storage device is smaller than the lowest charge of the constant voltage mode of the second DC/DC converter in the second operation mode of the microgrid system, the microgrid system enters a fourth operation mode through a second starting mode;
when the micro-grid system is in an operating state, the micro-grid system enters a full-stop power-off state through manual shutdown equipment.
11. The control method of claim 10, wherein entering the second operating mode via a first start-up mode comprises:
the DC/DC converter and the DC/AC converter are enabled for startup;
the control device issues a starting instruction to the second DC/DC converter;
the DC/DC converter executes a start-up instruction;
after the DC/DC converter is started successfully and the DC/AC converter returns a signal, the control device issues a first starting instruction to the DC/AC converter, the DC/AC converter is started, and the system enters a second operation mode.
12. The control method of claim 10, wherein entering the third operating mode via a first start-up mode comprises:
when the energy storage equipment fails, the diesel generator is allowed to start;
the control device closes the second switch output node and starts the diesel generator;
and the diesel generator normally operates, and the system enters a third operation mode.
13. The control method of claim 10, wherein entering the fourth operating mode via a second start-up mode comprises:
the diesel generator, the DC/DC converter, the DC/AC converter are enabled to start;
the control device closes the second switch output node, starts the diesel generator, and the diesel generator normally operates in a constant voltage mode;
the DC/AC converter returns a signal for allowing direct current constant voltage starting;
the control device issues a direct-current constant-voltage starting instruction to the DC/AC converter, and the DC/AC converter normally operates in a voltage source mode;
the DC/DC converter returns a start-enabling signal;
and the control device issues a mode instruction and a starting instruction to the DC/DC converter, the DC/DC converter normally operates in a constant power mode, and the system enters a fourth operation mode.
14. A control apparatus for a microgrid system, comprising:
a first operation module: when the micro-grid system meets a first operation mode condition, controlling the micro-grid system to operate in the first operation mode;
a second operation module: when the micro-grid system meets a second operation mode condition, controlling the micro-grid system to operate in a second operation mode;
a third operation module: when the micro-grid system meets a third operation mode condition, controlling the micro-grid system to operate in a third operation mode;
a fourth operation module: when the micro-grid system meets a fourth operation mode condition, controlling the micro-grid system to operate in a fourth operation mode;
a first start module: the micro-grid system is in a full power-off state and enters the second operation mode or the third operation mode through a first starting mode;
a second starting module: and when the charge of the energy storage device is smaller than the lowest charge of the constant voltage mode of the second DC/DC converter in the second operation mode, the microgrid system enters the fourth operation mode through the second starting mode.
15. A microgrid system, comprising:
a diesel generator;
the DC/AC converter is connected with the diesel generator through a cable and controls the running mode of the diesel generator;
the control device is connected with the diesel generator through a cable and controls the starting and stopping of the diesel generator;
the alternating current bus is connected with the diesel generator;
the direct current bus is connected with the alternating current bus through the DC/AC converter;
the new energy power generation equipment is connected with the direct current bus through a first DC/DC converter;
and the energy storage equipment is connected with the direct current bus through a second DC/DC converter.
16. The microgrid system of claim 15, wherein the control device is in information communication with the diesel generator, the first DC/DC converter, the second DC/DC converter and the DC/AC converter through communication lines.
17. The microgrid system of claim 15, wherein the modes of operation of the microgrid system comprise:
one or more of a first operation mode, a second operation mode, a third operation mode and a fourth operation mode which are mutually switchable.
18. The microgrid system of claim 15, wherein the startup mode of the microgrid system comprises:
a first start-up mode and/or a second start-up mode.
19. An electronic device, comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the control method of any one of claims 1-13.
20. A computer-readable medium, on which a computer program is stored, which, when being executed by a processor, carries out the control method according to any one of claims 1 to 13.
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