静止无功发生器（SVG）作为动态无功补偿和谐波抑制的重要手段，愈发受到人们重视。本文通过建立其数学模型，并分析无功电流检测和控制方法，使静止无功发生器（SVG）可以补偿负载电流中的无功分量、负序分量和谐波分量。 本文在现有无功和谐波电流检测方法的基础上，提出一种基于瞬时对称分量法与ip-iq运算方式相结合的无功电流检测方法。通过该方法得到负载侧电流的基波有功分量，通过与负载侧电流作差，进而得到需要补偿的分量，并采用电流内环和电压外环的双闭环电流直接控制策略，实现无功补偿、补偿三相不平衡和抑制谐波的目的。 最后，利用MATLAB/Simulink建立静止无功发生器（SVG）的仿真模型，分别在三相平衡和三相不平衡的条件下，对该系统模型进行仿真验证，得到补偿前后的电压和电流波形以作对比，并对补偿后的电流进行FFT分析。结果显示，当补偿感性无功负荷和容性无功负荷时，补偿后三相电压和电流相位基本一致；当补偿谐波负荷时，补偿后总谐波畸变率下降了11.7%；当补偿带谐波的无功负荷时，补偿后三相电压和电流相位基本一致且总谐波畸变率下降了10.52%；当三相负载不对称时，补偿后三相电压和电流相位基本一致且补偿后的三相电流幅值基本相等；当三相电压不平衡度为4.05%时，静止无功发生器（SVG）补偿无功的效果没有受到影响。

Static Var Generator (SVG) as an important means of reactive power compensation and harmonic suppression is getting more and more attention. This paper establishes the mathematical model，and analyzes the detection and control methods of reactive current, it makes Static Var Generator (SVG) can compensate the reactive component, negative sequence component and harmonic component of the load current. Based on the existing reactive power and harmonic current detection method, this paper proposes a reactive current detection method based on instantaneous symmetrical component method and ip-iq algorithm. It gets fundamental active power component of load current side by this method，and subtract fundamental active power component from the load current，so it can get the component of compensating. it adopted double closed loop strategy of the Current Closed Loop and Voltage Closed Loop，this can realize the purpose of reactive power compensation ，three phase unbalance compensation and harmonic suppression At last，building simulation model of Static Var Generator (SVG) by using MATLAB/Simulink，the system model is simulated and verified under the condition of three-phase balance and three-phase unbalanced，the waveforms of the voltage and current are obtained of before and after compensation，and the compensation current is analyzed by FFT. The results show that the phase of three-phase voltage and current are basically the same after the reactive load or capacitive load is compensated, and the total harmonic distortion (THD) is decreased by 11.7% after the harmonic load is compensated, the phase of three-phase voltage and current are basically the same and the total harmonic distortion (THD) is decreased by 10.52% after the reactive load that has harmonics is compensated, the phase of three-phase voltage and current are basically the same and the amplitude of the three phase current is almost equal after the load is compensated when the three-phase load is unbalanced, and the compensation effect of the Static Var Generator (SVG) is not affected after the load is compensated when three-phase unbalance degree is 4.05%.