摘要
含风电场群的区域电网电压控制受风电功率随机性和波动性的影响,不同时间常数无功控制设备之间的协调问题变得更加突出,电压安全性和无功补偿设备的可控性难以兼顾。为此,提出了计及快速连续和慢速离散无功控制设备的多时间尺度无功协调控制方法,基于风电功率预测数据波动特征提取与时段划分,设计了两层多阶段风电场电压协调控制模型。第一层,依据风电功率预测,超前对慢速离散设备和快速连续设备在预测时间尺度内综合优化。该控制方案一方面可以减少离散设备的动作次数,另一方面通过引入连续无功设备的裕度指标,增大了应对风电不确定性所带来电压越限风险的能力。第二层,充分利用短时间尺度无功设备可以快速连续调节的特点制定其控制策略,对第一层控制效果进一步实施分阶段优化,量化短时间尺度无功设备的控制方式。含多风电场的区域电网典型算例的对比计算结果验证了该模型方法的实用性。
Based on the characteristic extraction and period division of wind power forecasting, a voltage coordination control model of two-tier and multi-stage is proposed, considering different time scale of fast response and slow response reactive power compensation equipment. In the first tier, the look-ahead control schemes of the discrete equipmen and continuous equipment are optimized synthetically in the forecasting time scale. For one thing, it can decrease the switch times of discrete equipment, and for another the objective function of continuous controllable reactive power margin can effectively improve the capabilities to withstand risks of voltage over-limit. In the second tier, the schemes of continuous controllable reactive power equipment are made for further voltage adjustment with short rolling cycle taking full advantage of its fast and continuous control abilities to improve the control effect of the first tier. Finally, results of typical case with multiple wind farms testify the validity of the model.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第22期1-7,13,共8页
Power System Protection and Control
基金
国家科技支撑计划资助项目(2011BAA07B03)
国家自然科学基金资助项目(51177092)~~
关键词
风电场群
无功控制
自动电压控制
多目标优化
风电功率预测
wind farm cluster： reactive power control. AVC： multi-objectiveoptimization, wind power forecasting
