Intelligent AVC system adjustment method and apparatus

Abstract

The invention provides an intelligent AVC system adjustment method. The adjustment method comprises the steps: (1) an AVC system calculates a reactive output reference value of the current wind powerplant and a voltage of a common connecting point according to the voltage, current, and power factor measurement values and a power factor angle reference value of the common connecting point when thepower grid satisfies the requirement of the common connecting point of the wind power plant; (2) reactive output constraint is calculated, and if the reactive output upper limit value in the wind power plant is greater than the reference value and the voltage of the common connecting point is greater than a limiting value, a dynamic reactive compensation apparatus separates from AVC system control, and a constant voltage mode is switched; and (3) when it is detected that the voltage of the common connecting point is recovered to the normal range and when the reactive output in the wind powerplant is declined to be less than the reference value, the dynamic reactive compensation apparatus maintains the current state, and prepares to receive an ACV system instruction, and the AVC system performs steady state mode operation according to the current power grid dispatching instruction. A corresponding intelligent AVC system adjustment apparatus is disclosed for optimizing the current voltage reaction automatic adjustment, lowering power grid loss, improving voltage quality, lowering cost in voltage reactive optimizations adjustment and prolonging the service life of the adjustment equipment.

Description

technical field [0001] The invention belongs to the technical field of wind farms, and in particular relates to an intelligent AVC system adjustment method and a device thereof. Background technique [0002] The automatic voltage control (AVC) system of wind farms is a key technology for wind farms to enhance their own operational safety and voltage stability. The research on the regulation strategy of AVC system mostly focuses on stabilizing the voltage at the common connection point of the wind farm. Document CN102270847A discloses an online detection method and device for an intelligent AVC system, including acquiring control operation information of the AVC system, collecting online reactive power control operation information of a power grid system connected to the AVC system, and separately operating the reactive power control operation of the power grid system. The control operation information of the system and the AVC system is compared with the preset standard inf...

AI Technical Summary

Problems solved by technology

DFIG itself has a large reactive power capacity and can be adjusted freely, and its reactive power output is controlled by the AVC system. However, since the AVC system needs to spend more time in the communication process, the reactive power adjustment speed of DFIG is relatively slow, generally second level, while the transient process of the power grid is millisecond level, so DFIG can only be used for stable regulation, but not for transient regulation

[0003] Pinglu Wolongdong Wind Farm’s regulation pass rate was 78.09% in January, with a power assessment of 156.05MWH; in February, the pass rate of regulation was 75.4%, and the test electricity was 131.32MWH; in March, the pass rate of regulation was 88.92%, and the test electricity was 51.71MWH; in April, the pass rate of regulation was 88.92%. 85.75%, the assessment electricity was 95.34MWH; the qualified rate of regulation in May was 78.3%, and the assessment electricity was 147.6MWH; the regulation pass rate in June was 83.34%, and the assessment electricity was 75.65MWH. Bad influence on the power grid

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