Island micro-grid reactive power equalized control method and device without interconnection communication

A technology of interconnection communication and micro-grid, which is applied in the direction of circuit device, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as frequency fluctuation and affecting the stability of micro-grid system, and achieve the elimination of line impedance differences, Realize reactive power sharing and suppress reactive power circulation

Inactive Publication Date: 2019-08-30
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

Literature [20] applies reactive power deviation to active power-frequency droop control to generate active power disturbance, and then sends a synchronization signal through low-bandwidth communication to apply the disturbance to reactive power-voltage droop control to eliminate reactive power deviation. The scheme will generate frequency fluctuations, which will affect the stability of the microgrid system

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  • Island micro-grid reactive power equalized control method and device without interconnection communication
  • Island micro-grid reactive power equalized control method and device without interconnection communication
  • Island micro-grid reactive power equalized control method and device without interconnection communication

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Embodiment Construction

[0077] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0078] A reactive power sharing control method for an island microgrid without interconnection and communication, which is implemented by a computer system in the form of computer software. Multiple distributed power sources in the microgrid are connected in parallel to the common bus through inverters, and the corresponding devices include: Memory, processor and program, the processor implements the following steps when executing the program:

[0079] Step S1: After receiving the trigger signal from the central control, execute the initial power distribution stage: the total active p...

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Abstract

The invention relates to an island micro-grid reactive power equalized control method and device without interconnection communication. The method comprises a step S1 of an initial power distributionstage: obtaining the total load active power in a local controller; a step S2 of a secondary power distribution stage: obtaining the average reactive power in the local controller based on the total active power; and a step S3: a power balance stage: adjusting virtual impedance by means of a difference between the average reactive power and the actual value Qi of the inverter output power to modify inverter equivalent line impedance and adjust the inverter output voltage. Compared with the prior art, the method measures the total active power and the average reactive power of the load by usingthe local controller through the initial power distribution stage and the secondary power distribution stage respectively, further designs, in the power balance stage, the virtual impedance by meansof the average reactive power and the inverter output reactive power, adaptively adjusts the inverter output voltage, eliminates the difference of the inverter equivalent line impedance, and achievesequalization of reactive power.

Description

technical field [0001] The invention relates to a power sharing control technology of an isolated island AC microgrid, in particular to a reactive power sharing control method and device for an isolated island microgrid without interconnection and communication. Background technique [0002] In recent years, the development of microgrid has attracted extensive attention from domestic and foreign scholars. Microgrid is a new grid form that combines distributed power supply, energy storage device, controllable load and other units [1-2], which realizes the flexible control of distributed generation (Distributed Generation, DG) [3-5 ]. [0003] The operation modes of microgrid include island mode and grid-connected mode [6-7]. The control strategy of DG parallel operation generally includes the master-slave control method based on the interconnection line, the centralized control method, the average load distribution method and the droop control based on the non-interconnecti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/38
CPCH02J3/18H02J3/381H02J3/388Y02E40/30
Inventor 米阳颜丽韩云昊蔡杭谊陈鑫宋元元贾志强杨兴武田书欣
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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