CN211556873U - Multi-state self-adaptive coordination control system for micro-grid - Google Patents

Multi-state self-adaptive coordination control system for micro-grid Download PDF

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CN211556873U
CN211556873U CN201921011596.XU CN201921011596U CN211556873U CN 211556873 U CN211556873 U CN 211556873U CN 201921011596 U CN201921011596 U CN 201921011596U CN 211556873 U CN211556873 U CN 211556873U
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controller
microgrid
state
control system
control
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姚承勇
张进滨
姚海强
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Beijing Qunling Energy Resources Technology Co Ltd
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Beijing Qunling Energy Resources Technology Co Ltd
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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
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • 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
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/14—Energy storage units

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Abstract

The utility model provides a many states of little electric wire netting self-adaptation coordinated control system, including human-computer interaction interface, little electric wire netting coordinated controller, measurement and control terminal, little electrical source controller, energy storage controller and load controller, human-computer interaction interface be used for to little electric wire netting coordinated controller sends control command, little electric wire netting coordinated controller receives measurement and control terminal's data measurement and control terminal will little electric wire netting coordinated controller's control command send to little electrical source controller energy storage controller with the load controller. The coordination control system can master the running state of the microgrid in real time, and can coordinate and control each microgrid, energy storage equipment and load according to the running state of the microgrid, so that the microgrid can be smoothly switched under various states.

Description

Multi-state self-adaptive coordination control system for micro-grid
Technical Field
The utility model relates to a little electric wire netting control field, in particular to little electric wire netting multistate self-adaptation coordinated control system.
Background
With the rapid development of the world economy and the continuous improvement of the quality of life of people, the demand of various countries in the world for energy is gradually increasing. However, these conventional energy sources have caused great pollution to the ecological environment, and have caused serious ecological problems to human beings. In order to solve the two problems of energy shortage and environmental pollution and realize sustainable development of economy and human society, novel alternative energy sources must be developed vigorously. In recent years, renewable energy sources such as solar energy and wind energy are becoming ideal alternative energy sources of traditional fossil energy sources due to the characteristics of no pollution, inexhaustibility and the like. However, there are various operation modes of the microgrid based on renewable energy, and a reliable and complex microgrid control strategy needs to be established.
The traditional microgrid controller is based on the secondary frequency modulation principle of an electric power system, can realize power distribution of non-difference frequency modulation for frequency control of a micro power supply, and can better realize the effect of non-difference frequency modulation by selecting proper control parameters. In addition, in the process of switching the actual microgrid from grid connection to an unplanned island, the traditional microgrid controller is difficult to convert power control of a main control unit into V/F control, and the influence of microgrid access on a main grid is less considered.
SUMMERY OF THE UTILITY MODEL
In order to solve the shortcomings of the prior art, the utility model aims to provide a micro-grid multi-state self-adaptive coordination control system, which realizes the self-adaptive coordination control of a micro-grid power supply under a plurality of working states.
In order to realize the above-mentioned purpose, the utility model provides a many states of little electric wire netting self-adaptation coordinated control system, little electric wire netting many states self-adaptation coordinated control system includes human-computer interaction interface, little electric wire netting coordinated controller, measurement and control terminal, little electrical source controller, energy storage controller and load controller, human-computer interaction interface be used for to little electric wire netting coordinated controller sends control command, little electric wire netting coordinated controller receives measurement and control terminal's data the measurement and control terminal will little electric wire netting coordinated controller's control command send to little electrical source controller energy storage controller with load controller.
Preferably, the microgrid coordinated controller controls the microgrid connection state and the energy storage unit capacity provided by the measurement and control terminal.
Preferably, the microgrid connection state comprises an island state and a grid connection state.
Preferably, the energy storage unit capacity is described by a microgrid energy storage unit state variable B.
Preferably, the input of the microgrid coordinated controller is the running state and the system state quantity of the current system, and the system state quantity comprises shutdown, recovery, standby, emergency, off-grid normal running and grid-connected normal running.
Preferably, the control strategy of the microgrid coordinated controller comprises P-V droop control and V/F control.
Preferably, the microgrid coordinated controller selects a control strategy of the microgrid coordinated controller according to the system state quantity.
Preferably, the microgrid coordinated controller communicates through an ethernet port.
Preferably, the multi-state self-adaptive coordination control system of the microgrid adopts a layered control structure, the human-computer interaction interface is a monitoring layer, the microgrid coordination controller is a coordination control layer, and the measurement and control terminal is the micro-power controller, the energy storage controller and the load controller are equipment layers.
Preferably, the monitoring layer may simulate a working condition according to a natural condition, where the natural condition includes a strong wind and sunny day, a cloudy day, a normal weather, and a cloudy weather.
Compared with the prior art, the beneficial effects of the utility model are embodied in:
(1) the utility model discloses carry out coordinated control according to little electric wire netting connection state, realized the self-adaptation coordinated control to the power under a plurality of operating condition, make and be incorporated into the power networks to unplanned island switching in-process, control strategy automatic conversion is the control of V/F, has improved control strategy's adaptability.
(2) The utility model discloses regard the different states of energy storage unit as the state input volume, the microgrid coordinated control ware can be in the energy storage state of charge of difference under correct switching load, take suitable power control to the little power of intermittent type nature, guaranteed the steady operation of little electric power balance of power generation and system of electric power.
(3) The utility model discloses a host computer interface sets up simulation running state, has realized the switching of different environmental conditions, has reduced the misjudgment and the wrong report risk that the little electric wire netting operation in-process arouses because of environmental factor.
Drawings
Fig. 1 is a schematic structural diagram of a micro-grid multi-state adaptive coordination control system according to the present invention;
fig. 2 is a schematic diagram illustrating the transition of the operating state of the microgrid according to the present invention;
fig. 3 is a working flow of the microgrid coordinated controller of the present invention.
Detailed Description
In order to further understand the structure, characteristics and other objects of the present invention, the following detailed description is given with reference to the accompanying preferred embodiments, which are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention.
Fig. 1 is a schematic structural diagram of a micro-grid multi-state adaptive coordination control system. Little grid multistation self-adaptation coordinated control system includes human-computer interaction interface, little grid coordinated controller, measurement and control terminal, little electrical source controller, energy storage controller and load controller in FIG. 1, human-computer interaction interface be used for to little grid coordinated controller sends control command, little grid coordinated controller receives measurement and control terminal's data measurement and control terminal will little grid coordinated controller's control command send to little electrical source controller energy storage controller with load controller.
And the microgrid coordination controller controls according to the microgrid connection state and the energy storage unit capacity provided by the measurement and control terminal.
The micro-grid connection state comprises an island state and a grid connection state. The microgrid connection state variable is expressed by M, and the specific expression is as follows:
Figure DEST_PATH_GSB0000186785550000041
the energy storage unit capacity is described by a microgrid energy storage unit state variable B. The expression of the state variable B of the microgrid energy storage unit is as follows:
Figure DEST_PATH_GSB0000186785550000042
wherein SOC is the state of charge of the energy storage unit, SOCminMinimum capacity, SOC, for operation of energy storage unitsDThe standby capacity of the energy storage unit.
After the microgrid connection state and the microgrid energy storage unit state variables are determined, the system state variables may be determined as follows:
stopping the machine: m is 0, B is 0;
and (3) recovering: m is 1, B is 0;
standby: m is 0, B is 1;
emergency: m is 1, B is 1;
and (4) normal operation of off-grid: m is 0, B is 2;
grid connection normal operation: m is 1 and B is 2.
The control strategy of the microgrid coordinated controller comprises P-V droop control and V/F control. The expression of the output end voltage V and the frequency F of the energy storage unit controlled by the V/F is as follows:
Figure DEST_PATH_GSB0000186785550000051
kp and Kq are respectively an active power droop coefficient and a reactive power droop coefficient, V and f are respectively a voltage reference value and a frequency reference value, and P and Q are respectively an active power reference value and a reactive power reference value.
Fig. 2 is a schematic diagram of the transition of the operation state of the microgrid. And the microgrid coordinated controller selects a control strategy of the microgrid coordinated controller according to the system state quantity. The measurement and control terminal uploads the operation data and the state information to the microgrid coordination controller, the current system state vector Z is used as an input variable, and the next operation state and unit control mode are output variables, so that the microgrid can be automatically switched in multiple states. The current system state vector Z may be represented as (M, B), corresponding to each operating state.
And the micro-grid coordination controller communicates through an Ethernet port. The multi-state self-adaptive coordination control system of the micro-grid adopts a layered control structure, a human-computer interaction interface is a monitoring layer, the micro-grid coordination controller is a coordination control layer, and the measurement and control terminal is provided with the micro-power controller, the energy storage controller and the load controller which are equipment layers. The ethernet interface between the layers follows the TCP/IP protocol.
Fig. 3 is a work flow of the microgrid coordinated controller, the main flow includes:
step 1: gather each unit intelligent terminal's operating data and state in real time, its data collection includes: the working state, the electrical information, the control mode, the control parameters, the meteorological information, the system fault information and the like of each unit;
step 2: analyzing and processing data, issuing control commands such as droop coefficients, power set values, load switching and the like to the equipment-level controller according to the control strategy of the microgrid coordinated controller, and performing control on the power generation power of the microgrid, load switching and the like;
and step 3: and uploading the operating parameters of the microgrid to monitoring software, and displaying the operating parameters in real time.
The monitoring layer can simulate working conditions according to natural conditions, wherein the natural conditions comprise strong wind and sunny days, cloudy days and no wind, normal weather and cloudy weather. The set parameter change rate is:
in strong wind and sunny days: the change rate of the output power of the fan is 10kW/s-1Photovoltaic output power change rate of 20kW/s-1Photovoltaic output power change rate of 5kW/s-1；
Absence of wind in cloudy days: the change rate of the output power of the fan is 0kW/s-1Photovoltaic output power change rate of 10kW/s-1Photovoltaic output power change rate of 10kW/s-1；
Normal weather: the change rate of the output power of the fan is 15kW/s-1Photovoltaic output power change rate of 20kW/s-1Photovoltaic output power change rate of 30kW/s-1；
Cloudy weather: the change rate of the output power of the fan is 15kW/s-1Photovoltaic output power change rate 15kW/s-1Photovoltaic output power change rate of 10kW/s-1。
Compared with the prior art, the invention has the beneficial effects that:
1. the structure is simple, the circuit is reliable, and the manufacture is easy;
2. automatic multi-state coordination control can be carried out;
3. the control strategy can be automatically adjusted according to the state of the storage battery;
4. the state can be debugged through a human-computer interaction interface, and the maintenance is easy;
5. the cost is low.
It should be noted that the above mentioned embodiments and embodiments are intended to demonstrate the practical application of the technical solution provided by the present invention, and should not be interpreted as limiting the scope of the present invention. Various modifications, equivalent substitutions and improvements will occur to those skilled in the art and are intended to be within the spirit and scope of the present invention. The protection scope of the present invention is subject to the appended claims.

Claims (8)

1. The utility model provides a many states of little electric wire netting self-adaptation coordinated control system, a serial communication port, little electric wire netting many states self-adaptation coordinated control system includes man-machine interaction interface, little electric wire netting coordinated controller, measurement and control terminal, little electrical source controller, energy storage controller and load controller, man-machine interaction interface be used for to little electric wire netting coordinated controller sends control command, little electric wire netting coordinated controller receives measurement and control terminal's data measurement and control terminal will little electric wire netting coordinated controller's control command send to little electrical source controller energy storage controller with load controller.
2. The microgrid multi-state adaptive coordination control system as claimed in claim 1, wherein the microgrid coordination controller controls according to a microgrid connection state and energy storage unit capacity provided by the measurement and control terminal.
3. The microgrid multi-state adaptive coordination control system of claim 1, wherein the microgrid connection states include an islanding state and a grid-connected state.
4. The microgrid multi-state adaptive coordination control system of claim 2, wherein the energy storage unit capacity is described by a microgrid energy storage unit state variable B.
5. The microgrid multi-state adaptive coordination control system as claimed in claim 1, wherein inputs of the microgrid coordination controller are an operation state of a current system and system state quantities, and the system state quantities comprise shutdown, recovery, standby, emergency, off-grid normal operation and grid-connected normal operation.
6. The microgrid multi-state adaptive coordination control system according to claim 5, characterized in that the microgrid coordination controller selects a control strategy of the microgrid coordination controller according to the system state quantities.
7. The microgrid multi-state adaptive coordination control system of claim 1, wherein the microgrid coordination controller communicates through an ethernet port.
8. The microgrid multistate adaptive coordination control system according to claim 1, characterized in that the microgrid multistate adaptive coordination control system adopts a layered control structure, the human-computer interaction interface is a monitoring layer, the microgrid coordination controller is a coordination control layer, and the measurement and control terminal, the microgrid controller, the energy storage controller and the load controller are equipment layers.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110365044A (en) * 2019-07-02 2019-10-22 北京群菱能源科技有限公司 A kind of micro-capacitance sensor multimode self-adaptive wavelet base system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110365044A (en) * 2019-07-02 2019-10-22 北京群菱能源科技有限公司 A kind of micro-capacitance sensor multimode self-adaptive wavelet base system

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