Improved droop control method based on communication network for distributed power source in parallel connection operation mode in micro power grid system

Abstract

The invention discloses an improved droop control method based on a communication network for a distributed power source in a parallel connection operation mode in a micro power grid system. The defect of a traditional droop control method is overcome, the performance of the distributed power source in the parallel connection operation mode is improved, the stability of the system is improved, and the improved droop control method is suitable for control over the parallel connection operation mode in the micro power grid system which integrates with new energy resource distributed power generation. According to the improved droop control method, a communication network is used as the basis, a central controller in the micro power grid system and controllers of all inverter units form an entire control system, the active power and the reactive power of public loads are calculated, and the droop control scheme of each distributed power source is corrected. The scheme is used, a better power flow equalizing effect can be achieved, smaller deviation of busbar voltage frequency and amplitude is achieved, and a good application prospect is achieved.

Description

technical field [0001] The invention relates to an improved droop control method based on communication network for the parallel operation mode of distributed power sources in a micro-grid system, involving the operation of the micro-grid system and the parallel operation mode of multiple distributed power sources, especially In the micro-grid system composed of new energy sources such as wind energy and wind energy, it belongs to the field of new energy. technical background [0002] As the prices of fossil fuels such as oil and coal continue to rise, countries around the world are taking various measures to deal with the challenges brought about by the energy crisis. At present, the whole world is actively promoting the construction of new high-efficiency energy systems, among which distributed generation, renewable energy and micro-grid technology are one of the current research hotspots. [0003] Distributed power generation technology can integrate various types of ren...

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Problems solved by technology

[0007] However, the traditional droop control method has the following defects: (1) The larger the droop control coefficient, the better the power sharing characteristics, the higher the power control accuracy, the smaller the circulating current, but the larger the steady-state error of the output voltage. (2) The deviation of the frequency and amplitude of the output voltage is related to the public load, the greater the load power, the greater the deviation

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