基于静止无功发生器的VFOC算法仿真研究

摘要

Voltage Oriented Control Method and Simulation Research on Static var GeneratorYANG Sun,SUI Ke-gui(School of Electronic and Information Engineering, LiaoningTechnicalUniversity, HuludaoLiaoning125105,China) ABSTRACT:In the the paper, the basic idea of vector control was applied to grid voltage. First, it described the tra-ditional current control methods specific issues and introduced the principle VFOC algorithm to represent each sate of the Static Var Generator( SVG) in the voltage-oriented vector coordinates through the achievement of algorithm on ac-tive current and reactive current decoupling control. Simulation and field test results show that SVG devices running virtual flux oriented control method can regulate the current phase of grid voltage effectively, and also harmonic com-ponent of the output current can be effectively suppressed, which improves the system stability and makes up the shortcomings of the conventional current control. It is very important to improve SVG effect of reactive power compen-sation.%在供电系统电流优化问题的研究中，针对电流控制方法在静止无功发生器( SVG)无功补偿方面存在的由开关频率不稳定造成的较大的脉动电流和开关噪声、补偿环节参数难以确定等缺陷，提出了虚拟磁链定向矢量控制(VFOC)，将矢量控制的基本思想应用于电网电压控制当中。首先阐述了传统的电流控制方法在静止无功发生器应用中所显现的具体问题，介绍VFOC算法的原理，将SVG的各个状态方程在电压定向矢量坐标系中表示出来，通过算法实现无功电流与有功电流解耦控制。仿真及现场试验结果表明，运行虚拟磁链定向控制方法的SVG装置，使电网电压电流相位得到有效调节，输出电流谐波分量得到有效抑制，系统稳定性得到提高，弥补了传统电流控制的缺点，对于SVG的无功补偿效果提高具有重要的现实意义。