Voltage coordinated control method for decentralized wind power connection to a hybrid distribution network

Abstract

The invention provides a voltage coordination control method for decentralized wind power to be connected to a hybrid distribution network, which comprises the following steps: S1, acquiring operationstate parameters of the power network; S2, judging whether the voltage exceeds the limit or not, and if so, executing step S3, otherwises maintaining the current running state; 3, selecte a control target node; 4, calculating reactive power instruction by that voltage controller and distributing the reactive power instruction to each reactive power source; 5, re-judging that condition that the voltage exceed the limit, and if the voltage exceeds the limit, executing step S6, otherwise maintain the current running state; 6, judging whether that OLTC tap reaches the limit position, if not, changing the tap position, otherwise maintaining the current running state. The invention improves the voltage regulation range under the general AC / DC hybrid distribution network, can improve the voltagestability of the system, makes full use of the reactive power output capacity of the decentralized wind power and the VSC in the distribution network, reduces the equipment of the reactive power compensation device, delays the reconstruction and expansion of the distribution network, and improves the operation economy.

Description

technical field [0001] The invention relates to the technical field of power system new energy power generation, in particular to a voltage coordination control method for decentralized wind power access to a hybrid distribution network. Background technique [0002] The forms of wind power utilization in my country mainly include centralized wind power and decentralized wind power. Centralized wind power access to the grid usually uses reactive power compensation devices, on-load tap changer (OLTC) and reactive power adjustment of the wind turbine itself to adjust the voltage. Among them, OLTC is not a reactive power source, that is, it cannot transmit reactive power to the power system, but only plays a role in regulating the power flow distribution in the power system. In addition, although the OLTC has a large voltage regulation range, the taps cannot be switched frequently, the regulation speed is slow, and the regulation capability is limited. For distributed wind po...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a voltage coordination control method for decentralized wind power access to a hybrid distribution network, aiming to solve the problems of low voltage quality and low stability of decentralized wind farms in the prior art, and to improve the voltage regulation range. Improve system voltage stability and reduce the configuration of reactive power compensation devices

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