摘要
新型电力系统背景下,大规模新能源及用户侧负荷的随机波动为系统的实时平衡带来巨大挑战,直流型三相电力电子变压器因其高频电力变压特性成为未来提高系统稳定运行的重要智能终端。然而,当变换器采用传统单移相闭环控制时,受负载电流突变影响往往不具备较好的抗干扰及快速动态响应能力。提出一种基于有限集模型预测控制(finite control set-model predictive control,FCS-MPC)的快速动态响应控制策略,以实现在无功率预测工况下的快速动态响应性能。首先,根据运行模式建立直流型三相电力电子变压器的空间状态平均模型并离散化得到预测模型。随后,通过以输出电压为目标的代价函数推导出各采样周期下的最优移相占空比,并转换成开关控制信号。同时,提出逻辑比较单元以省略功率估算不精确对FCS-MPC控制结果造成的影响。最后,通过MATLAB/Simulink仿真平台验证所提控制策略的有效性。
Under the background of new power system,large-scale new energy and random fluctuation of user-side load bring challenges to the real-time balance of the system.Because of its high-frequency power variable voltage characteristics,the DC three-phase power electronic transformer will become an important intelligent terminal to improve the stable operation of the system in the future.However,when the converter is controlled by traditional single-phase shift closed-loop control,affected by load current mutation it often does not have good anti-interference and fast dynamic response ability.A fast dynamic response control strategy based on finite control set-model predictive control(FCS-MPC)is proposed to achieve fast dynamic response performance under non-power predictive conditions.Firstly,according to the operation mode,it establishes the spatial state average model of the DC three-phase power electronic transformerand the prediction model is obtained by discretization.Then,the optimal phase shift duty cycle under each sampling period is derived by the cost function aiming at the output voltage,which is converted into switching control signal.Meanwhile,a logic comparison unit is proposed to omit the influence of inaccurate power estimation on FCS-MPC control results.Finally,the effectiveness of the proposed control strategy is verified by MATLAB/Simulink simulation platform.
作者
胡大伟
孙家正
刘桁宇
张哲
王盼峰
HU Dawei;SUN Jiazheng;LIU Hengyu;ZHANG Zhe;WANG Panfeng(Electric Power Research Institute of State Grid Liaoning Electric Power Co.,Ltd.,Shenyang,Liaoning 110006,China;State Grid Dalian Power Supply Company,Dalian,Liaoning 116000,China)
出处
《东北电力技术》
2022年第10期12-16,共5页
Northeast Electric Power Technology
基金
国网辽宁省电力有限公司电力科学研究院提高技术创新能力及群众性创新课题研究“基于需求响应的低压台区分布式储能多模式优化运行研究”(2022YF-101)。
关键词
直流型三相电力电子变压器
快速动态响应
有限集模型预测控制
DC three-phase power electronic transformer
fast dynamic response
finite set-model predictive control
