含新能源电力系统的采样PI负荷频率控制

Sampling PI Load Frequency Control of Power System With New Energy Generation

针对不确定性传输时滞、系统参数、负荷扰动以及新能源间歇性功率,引发系统调频性能下降的问题,该文提出一种考虑控制信号变周期采样的采样比例积分(proportion integration,PI)负荷频率控制(sampling PI load frequency control,SPI-LFC)方案。首先,基于采样网络的静态输出反馈方法,构建电力系统SPI-LFC模型。然后,利用新的双边闭环型Lyapunov泛函,并结合自由矩阵不等式,得到系统的低保守性稳定准则与SPI控制器设计方法。仿真结果表明,提出的负荷频率控制(load frequency control,LFC)方案对电力系统参数和通信网络的不确定性、负荷扰动和新能源的间歇功率具有较强的鲁棒性。

Aiming at the system frequency regulation performance deterioration caused by the uncertain transmission delay,system parameters,load disturbance and the intermittent power of new energy,a sampling proportion integration(PI),load frequency control(SPI-LFC)scheme considering the variation of control signals’sampling period is proposed in this paper.First,the SPI-LFC model of power system is constructed by using the sampled-data-based static output feedback method.Then,a low conservative stability criterion and SPI controller design method is obtained by using the new two-side looped Lyapunov functional and free-matrix-based inequality.Simulation results show that the proposed LFC scheme has better robustness toward the uncertainty of power system parameters and communication network,load disturbance and intermittent power of the new energy.