Distributed renewable energy power generation grid-connected power fluctuation control system and control method

Abstract

The invention discloses a distributed type renewable energy source generating grid connected power fluctuation control system and control method. The distributed type renewable energy source generating grid connected power fluctuation control system comprises a renewable energy source generating device, a generating converter, a lithium ion super capacitor, a grid connected inverter and a power grid. The lithium ion super capacitor is directly connected to a DC bus of a grid connected inverter in parallel. The implementation of the distributed type renewable energy source generating grid connected power fluctuation control method comprises steps of detecting and calculating generating output power of a renewable energy source, obtaining a fluctuation component through wave filtering, obtaining a following component of DC voltage through calculation, superposing the following component on a DC voltage setting value as a DC voltage reference value of the grid-connected converter, and obtaining PWM wave having a certain duty ratio. The distributed type renewable energy source generating grid connected power fluctuation control system and control method can carry out on-off control on a switch tube, can effectively inhibit power fluctuation of the renewable energy source generating grid-connected power to achieve smoothening the grid-connected power. The lithium ion super capacitor has characteristics of high specific power and high specific energy, and meanwhile, an energy storage converter is eliminated.

Description

Technical field [0001] The invention belongs to the technical field of distributed renewable energy grid-connected power generation technology, and relates to a distributed renewable energy power generation grid-connected power fluctuation control system. The invention also relates to the use of the above-mentioned control system for distributed renewable energy grid-connected power fluctuation control Methods. Background technique [0002] Wind power and solar power generation have the characteristics of non-environmental pollution and huge development potential. They belong to the characteristics of sustainable renewable energy and have become the basis of human future energy supply systems. However, distributed renewable energy power generation has the characteristics of dispersion and random power fluctuations. The access of a large number of distributed power sources has a great impact on the safe and stable operation of the power distribution system, leading to increasingly...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a distributed renewable energy generation grid-connected power fluctuation control system to solve the problems of large grid-connected power fluctuations and low grid-connected power quality in the prior art

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