控制性能标准下考虑系统频率偏差特性的多时间尺度机组优化调度

Multi-time Scale Unit Optimal Scheduling Considering System Frequency Deviation Characteristics Under CPS Index

针对风电并网后传统的2阶段调度中自动发电控制(automatic generation control,AGC)机组调节压力过大,普通多时间尺度调度中未考虑控制性能标准(control performance strandard,CPS)考核指标导致机组调节费用较高等问题,通过对电网实际频率数据分析发现系统频率偏差均值在较长时间尺度上正负变化具有规律性,提出CPS指标下考虑系统频率偏差特性的多时间尺度优化调度模型。最后通过Matlab算例仿真验证模型的有效性,结果表明:所提出的新调度模型通过预测未来较长时间尺度下系统频率偏差符号的正负,在日内、实时调度阶段的关键时刻减少了非AGC机组调节出力,相比现有模型可以使电网满足CPS考核标准的同时减轻AGC机组调节压力,节省综合运行成本。

In allusion to such problems as excessive regulation pressure of automatic generation control(abbr.AGC)units in traditional two-stage dispatching after grid-connection of wind power and higher unit regulation expenses because of not considering control performance standard(abbr.CPS)assessment index in common multi time-scale dispatching,by means of analyzing actual frequency data of power grid it was found that on longer time scales the positive and negative change of the mean value of system frequency deviation possessed the regularity.Therefore,under the CPS index a multi-time scale optimization scheduling model,in which the characteristic of the system frequency deviation was considered,was proposed.The validity of the proposed model was verified by the simulation on Matlab platform.Simulation results show that by means of predicting that the symbol of system frequency deviation will be positive or negative under longer time scales in the future,the proposed new dispatching model decreases the regulated output of non-AGC units at the critical moment of intraday and realtime dispatching phase,and comparing with existing models,the proposed model can make the power grid satisfying CPS assessment criteria and at the same time the regulating stress of AGC unit can be relieved and the comprehensive operating cost can also be reduced.