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Island microgrid voltage and frequency adjustment method and system

A technology of voltage frequency and microgrid, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of unable to adjust the voltage and frequency of the island microgrid, and the burden of the communication network, so as to reduce the calculation burden, reduce the complexity, The effect of the simple calculation process

Pending Publication Date: 2020-10-30
CHINA ELECTRIC POWER RES INST +1
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problems existing in the prior art that acquiring information in the local area places a heavy burden on the communication network and cannot reliably adjust the voltage and frequency of the isolated island microgrid, the present invention provides a method and system for adjusting the voltage and frequency of the isolated island microgrid

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  • Island microgrid voltage and frequency adjustment method and system
  • Island microgrid voltage and frequency adjustment method and system
  • Island microgrid voltage and frequency adjustment method and system

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Embodiment 1

[0069] This embodiment provides a method for regulating the voltage and frequency of an isolated island microgrid. The flow chart of the method is as follows figure 1 shown.

[0070] The automatic voltage and frequency optimization adjustment of the system is realized through the primary stability control, secondary coordination control and distributed information processor.

[0071] Such as figure 2 As shown, the isolated microgrid control architecture consists of three parts: a primary stability controller, a secondary coordination controller and a distributed information processor. In the primary control, the grid-connected inverter of the distributed power source adopts the virtual synchronous generator technology, and the controllable load adopts the virtual motor technology. The secondary control includes two parts: voltage control and frequency control. The system voltage deviation δU obtained by the distributed information processor is ave and system frequency devi...

Embodiment 2

[0109] This embodiment provides an island microgrid voltage and frequency regulation system, the system includes:

[0110] Deviation calculation module: use the distributed information processor installed on the sampling node of the source network load system to obtain the variable information of the current sampling node, and perform data interaction and iterative calculation with the nearest adjacent sampling node to obtain the average voltage deviation of the system amount and average frequency deviation;

[0111] Adjustment amount calculation module: according to the average voltage deviation amount and the average frequency deviation amount, the secondary coordination controller obtains the voltage adjustment amount and frequency adjustment amount of the current sampling node through the second coordination control;

[0112] Regulation module: according to the voltage adjustment amount and frequency adjustment amount, the primary stability controller adjusts the voltage a...

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Abstract

The invention discloses an island microgrid voltage and frequency adjustment method and system. The method comprises the steps of collecting variable information through a distributed information processor, carrying out the data interaction and iterative calculation with a nearest adjacent node, and obtaining an average voltage deviation value and an average frequency deviation value; obtaining avoltage adjustment quantity and a frequency adjustment quantity through a secondary coordination controller; and adjusting the voltage and frequency of the island microgrid to stable operation throughdroop control by a primary stability controller. According to the scheme, the distributed information processing module only needs to perform information interaction with the nearest adjacent node onthe variable information, so that the complexity of processing the variable information of the source network load system is greatly reduced, and the operation burden is reduced; data interaction iscarried out on variable information of local nodes and neighbor nodes, the average voltage deviation and the average frequency deviation are directly obtained after iteration, the voltage and frequency adjustment quantity does not need to be calculated by collecting impedance parameters and constant-power load information of the system, and the method has the advantages of being small in amount ofcollected information and simple in calculation process.

Description

technical field [0001] The invention relates to the technical field of isolated microgrid control and optimization, in particular to a method and system for adjusting the voltage and frequency of an isolated microgrid. Background technique [0002] Most of the distributed power sources in the island microgrid are connected through grid-connected inverters, and the grid-connected inverters are used as the interface of distributed power sources, and their control methods determine the power quality of the system. Although the traditional droop control method can automatically distribute power among distributed power sources and provide voltage and frequency support for the system, its response speed is fast and there is almost no moment of inertia, so it cannot suppress the rapid fluctuation of frequency like traditional synchronous generators. It is not conducive to the stable operation of the system. The virtual synchronous generator control technology draws on the characte...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/381H02J3/46
Inventor 吴鸣盛万兴宋振浩吕志鹏孙丽敬季宇李蕊寇凌峰刘国宇蔺圣杰
Owner CHINA ELECTRIC POWER RES INST
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