基于模型预测控制的含混合型新能源电网电压控制策略

Voltage control strategy for hybrid new energy grid based on model predictive control

摘要

风力发电传统的并网控制方式是以最大功率跟踪为目标的电流源型跟网控制，而直流闭锁、换相失败等故障可能导致换流器端口的短时无功过剩并引发暂态过电压，危及运行安全。为探究构网型新能源场站对并网电压稳定性的支持作用，建立了含构网型和跟网型新能源场站的送端电网模型，在此基础上提出了基于模型预测控制的协调电压调节策略，考虑并网点电压并加入反馈环节调节风机变流器的无功控制参数，以最大限度地提高动态无功功率储备。最后，在PSCAD平台上搭建相关仿真系统并验证了理论分析的正确性。

Abstract

The traditional grid connected control method for wind power generation is current source type grid following control with the goal of maximum power tracking. However, faults such as DC blocking and commutation failure may cause short-term idle power at the converter port and trigger transient overvoltage, endangering operational safety. To explore the supporting role of grid connected new energy stations in grid voltage stability, a transmission end power grid model was established including grid connected and grid following new energy stations. Based on this, a coordinated voltage regulation strategy based on model predictive control is proposed, which considers the grid connected point voltage and adds a feedback loop to adjust the reactive power control parameters of the wind turbine inverter, in order to maximize the dynamic reactive power reserve. Finally, a relevant simulation system was built on the PSCAD platform and the correctness of the theoretical analysis was verified.

关键词

送端电网 / 构网/跟网型风电机组 / 暂态过电压 / 模型预测控制 / 协调电压控制策略

Key words

delivery end power grid / grid building/grid following wind turbines / transient overvoltage / model predictive control / coordinate voltage control strategy

Author summay

邵 冲(1984—), 男, 高级工程师, 博士, 从事电力系统分析、电网运行技术研究。E-mail: [e-mail]

基金资助

国家电网有限公司科技项目(5227222300)