The major problem in grid connected transmission and distribution networks are the power quality issues due to the unbalance loads. The power quality issues relate to the current and voltage based issues generated at the point of common coupling. Some of the current based power quality issues relate to reactive power extraction, poor zero voltage regulation, harmonics in the load currents undesired neutral current and power factor and. Several DSTATCOM compensation techniques has been introduced for compensation of reactive power and power quality issues in the three phase, four wire system. The proposed system focus on DSTATCOM soft computing techniques such as: Widrow–Hoff least mean square, vectorial filter, discrete adaptive filter and quasi Newton control algorithms. The proposed algorithms controlled the switches pulses to drive the voltage source converter section in the DSTATCOM network thereby mitigating power quality issues and reactive power generation in the grid connected photovoltaic system. The soft computing techniques has maintained constant DC bus capacitor voltage and common coupling voltage along with unity power factor, zero voltage regulation under linear and non-linear load conditions, eliminating the harmonics in the load currents. The proportional integral controller is used for error correction between the reference and capacitor voltage. The novel drift-free maximum power point technique has shown better results under varying temperature and irradiances conditions. The DSTATCOM soft computing techniques has been implemented and simulated in MATLAB/SIMULINK.

电网连接的输配电网络中的主要问题是由于负载不平衡导致的电能质量问题。电能质量问题与在公共耦合点产生的基于电流和电压的问题有关。一些基于电流的电能质量问题与无功功率提取，不良的零电压调节，负载电流中的谐波以及不希望的中性电流和功率因数有关。引入了几种DSTATCOM补偿技术来补偿三相四线制系统中的无功功率和电能质量问题。拟议的系统着重于DSTATCOM软计算技术，例如：Widrow-Hoff最小均方，矢量滤波器，离散自适应滤波器和拟牛顿控制算法。所提出的算法控制开关脉冲以驱动DSTATCOM网络中的电压源转换器部分，从而减轻了电能质量问题和并网光伏系统中的无功功率产生。软计算技术保持了恒定的直流总线电容器电压和公共耦合电压以及统一的功率因数，在线性和非线性负载条件下的零电压调节，从而消除了负载电流中的谐波。比例积分控制器用于参考电压和电容器电压之间的误差校正。新颖的无漂移最大功率点技术在变化的温度和辐照度条件下显示出更好的结果。DSTATCOM软计算技术已在MATLAB / SIMULINK中实现并进行了仿真。