用于物理模拟的可控负载设计及仿真  

Design and Simulation of Controllable Load for Physical Analog

作　　者：王宝安[1] 商姣[1] 常鹏飞[2] 孙健[3] 黄学良[1] 

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]国网电力科学研究院/南京南瑞集团公司,江苏省南京市210003 [3]江苏省电力试验研究院有限公司,江苏省南京市210036

出　　处：《电力系统自动化》2010年第22期70-74,共5页Automation of Electric Power Systems

基　　金：江苏省电力公司科技项目(J2009021)~~

摘　　要：提出了一种新型的电力系统可控负载。它可根据实际工况模拟各种类型的负载,并能将消耗的电能回馈到电网,同时不会对电网造成污染。电力系统可控负载的主电路采用2个电压型脉宽调制(PWM)变换器分别作为可控负载电流产生单元和电能回馈单元,2个单元均通过电感—电容—电感(LCL)滤波器与电网连接。文中建立了可控负载的数学模型,对可控负载产生单元采用比例—积分(PI)闭环控制,对电能回馈单元采用电压外环加电流内环的双闭环控制策略,并用频域分析法对系统稳定性进行了分析。仿真结果表明,装置在稳定运行的同时能够实现所需功能,说明控制方案及所选参数可行,为样机研制提供了理论依据。A new type of controllable load used in power system is proposed. There are two main features for this controllable load： first, different types of loads can be simulated under different operating conditions; second, the energy absorbed by controllable load could be returned to the grid, in such a way that the energy feedback capability is implemented, and the energy pollution can be eliminated. Two voltage source PWM converters are designed as the main topology structure of this energy feedback controllable load, which consists of a controllable load current generation unit （CI.CGU） and an energy feedback unit （EFU）. Both of these two units are connected to the grid through a LCL filter. The mathematical model of controllable load is established. PI closed loop control module is employed in CLCGU, while outer voltage loop and inner current loop control strategy is used in EFU. Frequency domain analysis is adopted to investigate the system stability. The simulation results verify that this controllable load can work stably and at the same time reach its desired functions. Conclusions can be arrived that the control scheme and parameters are feasible. It will provide a theoretical basis for the prototype development.

关 键 词：可控负载 脉宽调制变换器 电路设计 控制策略 物理模拟 电力系统 

分 类 号：TM743[电气工程—电力系统及自动化]