Rapid reactive power control method and control system for wind power plant

Abstract

The invention discloses a rapid reactive power control method and control system for a wind power plant, and the method comprises the steps: receiving a first instruction; acquiring a measured value of the bus; judging whether reactive power control is started or not based on the first instruction and a measured value of a bus; if yes, acquiring the reactive power needing to be output based on the measured value of the bus and the first instruction; and at least controlling reactive power output of a plurality of wind turbine generators based on the reactive power needing to be output. According to the rapid reactive power control method and system, reactive power output of the wind turbine generator and the additional reactive power compensation device is adjusted according to a power grid dispatching instruction and measurement information of a wind power station, the reactive power control capacity of the wind turbine generator is preferentially adopted, and the control mode that reactive power output of the wind turbine generator system serves as the main part and reactive power output of the additional reactive power compensation device serves as an auxiliary part is achieved; and the zero-output operation of the additional reactive power compensation device can be realized under the normal operation condition.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a fast reactive power control method and control system of a wind farm. Background technique [0002] Wind power generation is different from conventional power sources. The collection lines are long, and most of them are at the end of the power supply grid. The random fluctuation of the output power of the wind farm has many adverse effects on the operation of the grid, and it is easy to cause voltage fluctuations at the access point. If the point voltage level exceeds the limit, it will not only affect the quality of power supply, but also endanger the continuous network operation of wind turbines. [0003] As the most basic unit of wind power generation, wind turbines have become more and more mature in theory and related technologies. At present, wind turbines mostly operate with unit power factor, and the collection lines, step-up transformers and ...

AI Technical Summary

Problems solved by technology

At present, wind turbines mostly operate with unit power factor, and the collection lines, step-up transformers and sending lines in the station will consume a lot of reactive power

The traditional method is to install a large number of additional reactive power compensation devices (hereinafter referred to as SVC / SVG). The rated power of reactive power compensation devices is generally 30% of the rated active power of the station, which requires a large increase in initial construction costs, and will increase every year. Hundreds of thousands of dollars in power loss

In addition, the current automatic voltage control system of wind farms has long communication links and large communication delays, which will cause the reactive power response time of the entire system to fail to meet the requirements of fast reactive power regulation

Images