Voltage stability regulation system connected to distributed power supply and its control method

Abstract

The invention discloses a voltage stability regulating system for distributed power connection. A distributed power source comprises a photovoltaic power source body, a wind generation power source body and an energy storage device. A 'back-to-back'-based power electronic topological structure is adopted in the system, the system comprises a left power bridge and a right power bridge, the left power bridge is an STATCOM, and the right power bridge is a current transformer. A DSP controller module controls the STATCOM to provide reactive power for a PCC by modulating the PWM pulse of the left power bridge, the power generation efficiency of the wind generation power source body and the photovoltaic power source body and charging and discharging of the energy storage device are controlled by modulating the PWM pulse of the right power bridge, and the voltage stability of the PCC and the direct current side is achieved. The voltage fluctuation problem caused by load change and frequency fluctuation due to interruption of a power grid intermittent power source is solved, control over the voltage stability is achieved, and the compatibility and stability of the distributed power connection are improved.

Description

technical field [0001] The invention belongs to the technical field of distributed power generation microgrids, and in particular relates to a voltage stability regulation system connected to distributed power sources and a control method thereof. Background technique [0002] Energy sources such as wind energy and solar energy are widely distributed and can be continuously regenerated. Their use does not emit pollutants and greenhouse gases. When fossil energy is gradually exhausted, it will eventually become the main energy source for human beings in the future. The large-scale application of renewable energy has put forward higher requirements for the future power grid. The traditional power grid is difficult to meet these requirements. Therefore, some countries have proposed the concept of micro-grid based on the actual problems of their own power systems and the country's sustainable development energy goals. and development goals. As a new technical field, the develop...

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a voltage stability regulation system and its control method for distributed power supply access, to eliminate frequency fluctuations caused by intermittent power supply interruptions in the power grid and the impact on load changes on feeder lines in user areas, and to solve distributed power supply, The problem of voltage fluctuation caused by load switching can realize the voltage stability control of distributed power access and improve the compatibility and stability of distributed power access

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