随着感性负载形式的多样化，无功功率对电网产生了不可忽视的影响。传统无功补偿装置因其响应时间较长而逐渐不能满足补偿要求，静止无功发生器在传统装置的基础上实现了动态无功补偿，对提高电网功率因数，维持系统稳定性有着重要意义。 本文以电网中的无功功率为研究背景，基于瞬时无功功率理论对静止无功发生器的控制方法进行深入研究，设计出轴下双序解耦控制方法来解决不平衡负载下动态补偿问题，并通过系统仿真及样机平台设计验证补偿效果。 首先，介绍静止无功发生器的工作原理并建立相应的数学模型。通过阐述瞬时无功功率理论，对比分析和无功功率分离方法的优缺点。根据静止无功发生器的要求，设计出系统方案。 其次，对比直接控制和间接控制、轴控制和轴控制的优缺点，选择轴下电流直接解耦控制方法。考虑到不平衡负载对电网的影响，增加系统的负序电流控制，设计出轴下双序解耦控制方法。利用MATLAB软件搭建系统仿真模型，通过对平衡负载以及不平衡负载、感性负载以及容性负载分别仿真，验证所设计控制算法对系统有着良好的补偿效果。 最后，制作了SVG样机平台。硬件方面完成IPM模块、直流侧电容、连接电感等主电路器件的选型以及采样、过零检测等控制电路的设计。软件方面完成AD采样、锁相、数字滤波、SPWM输出等程序的设计。在此基础上，对系统联机调试，完成主电路逆变部分以及数据采样、过零检测、锁相、数字滤波、SPWM输出等实验。

With the diversification of the inductive load, the reactive power can not be ignored. Traditional reactive power compensation device for their response time too long, gradually can not meet the demands for compensation. Static var generator on the basis of traditional device to realize the dynamic reactive power compensation. It is of great significance to improve the power factor of power grid and maintain the stability of the system. The research background in this paper was reactive power of power grid. Research on control method of static var generator based on instantaneous reactive power theory. To solve the problem of dynamic compensation of unbalanced load by designing the axis decoupling control method of double sequence, and the compensation effect was verified by the system simulation and the design of the prototype platform. Firstly, the working principle of the static var generator is introduced and the corresponding mathematical model is established. The advantages and disadvantages of the method and the reactive power separation method are compared and analyzed by using the theory of instantaneous reactive power. The system scheme is designed, according to the requirement of static var generator. Secondly, Compared with the advantages and disadvantages of direct control and indirect control, axis control and axis control, the direct current decoupling control method of axis is selected. Considering the effects of unbalanced load on the power system, the negative sequence current control is increased, and the axis decoupling control method is designed. Using MATLAB software to build system simulation model, through the balance of load and unbalanced load, inductive load and capacitive load simulation, verify the design of the control algorithm has a good compensation effect. Finally, the SVG prototype platform was made. In terms of hardware, IPM module, DC side capacitor, connection inductance and other main circuit device selection were completed, and the control circuit was designed, such as the sampling circuit, the zero crossing detection circuit , etc. For the software, AD sampling, phase lock, digital filter, SPWM output, and the design of the program were completed. On this basis, the system was on-line debugging, the main circuit inverter and data sampling, zero crossing detection, phase lock, digital filter, SPWM output and other experiments were completed.