The need to generate pollution free energy has triggered the effect towards the usage of solar energy interconnection with the grid. Consequently, the Photovoltaic (PV) panel interfaced with the grid causes the power quality problems such as a voltage harmonics and voltage distortion etc., Active power filters are the powerful tool for mitigation of harmonics. This work involves the use of single-phase Unified Power Quality Conditioner (UPQC) based on a unit vector template control algorithm for its functions with grid integration of photovoltaic, such as voltage sags/ swell, unit power factor correction, voltage and current harmonic cancelation. The unit vector template control algorithm includes a phase-locked loop (PLL) mechanism that is responsible for avoiding multiple zero crossings during highly distorted grid voltage detection. A unit vector template control with a PLL-based control algorithm is applied to the shunt and series inverters of PV grid connected UPQC. In addition to normalizing voltage and current disturbances, the proposed controller has the functions of phase detection and perfect grid synchronization. It is proposed that the system performance is fully verified by MATLAB simulation with the response of load variation, transient response, THD, voltage swell and sag. The Total Harmonic Distortions (THDs) of proposed grid integration of photovoltaic systems through single-phase unified power quality conditioner (UPQC) obtain the range of IEEE standard.

产生无污染能源的需求已经触发了太阳能与电网互连的使用。因此，与电网连接的光伏（PV）面板会引起电能质量问题，例如电压谐波和电压失真等。有源功率滤波器是缓解谐波的有力工具。这项工作涉及使用基于单元矢量模板控制算法的单相统一电能质量调节器（UPQC），以实现其与光伏并网的功能，例如电压骤降/骤升，单位功率因数校正，电压和电流谐波消除。单位矢量模板控制算法包括锁相环（PLL）机制，该机制负责避免在高度失真的电网电压检测过程中出现多个零交叉。将具有基于PLL的控制算法的单位矢量模板控制应用于连接到UPQC的PV电网的并联和串联逆变器。除了对电压和电流干扰进行归一化处理外，该控制器还具有相位检测和完美的电网同步功能。建议通过MATLAB仿真对负载变化，瞬态响应，THD，电压骤升和骤降的响应进行全面验证，以验证系统性能。建议的光伏系统通过单相统一电能质量调节器（UPQC）进行电网集成的总谐波失真（THD）获得IEEE标准的范围。该控制器具有鉴相和完善电网同步的功能。建议通过MATLAB仿真对负载变化，瞬态响应，THD，电压骤升和骤降的响应进行全面验证，以验证系统性能。建议的光伏系统通过单相统一电能质量调节器（UPQC）进行电网集成的总谐波失真（THD）获得IEEE标准的范围。该控制器具有鉴相和完善电网同步的功能。建议通过MATLAB仿真对负载变化，瞬态响应，THD，电压骤升和骤降的响应进行全面验证，以验证系统性能。建议的光伏系统通过单相统一电能质量调节器（UPQC）进行电网集成的总谐波失真（THD）获得IEEE标准的范围。