In this work, a third order complex filter (TOCF) based control technique is used for a double stage grid tied solar photovoltaic (PV) system. The PV array generates the real power and provides it to the load connected and remaining to the utility. The voltage source converter functions as a distribution static compensator and improves power quality of the grid by mitigating harmonics, balancing of the grid currents with unity power factor. It also performs well under weak grid scenario like voltage distortion, grid faults, DC offset, voltage unbalances and swell/sag. The main objective of this work is positive sequence components extraction from unbalanced voltages for unit templates estimation and TOCF algorithm extracts the fundamental component of the load currents. A PV power term is applied for improved system performance. This work demonstrates the effectiveness of control algorithm at various dynamic conditions by simulating the behavior of the system in MATLAB. Tests are conducted on an experimental setup realized in the laboratory at different abnormal situations like load unbalancing, voltage unbalance, voltage distortions, voltage swell/sag, insolation change, DSTATCOM-PV mode and PV-DSTATCOM mode etc. The system operation is found satisfactory and distortion levels in grid currents are found in bounds, as suggested in IEEE standard-519.

中文翻译：

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基于 TOCF 的并网太阳能光伏系统优化运行控制

在这项工作中，基于三阶复滤波器 (TOCF) 的控制技术用于双级并网太阳能光伏 (PV) 系统。光伏阵列产生实际功率，并将其提供给连接并保留给公用事业的负载。电压源换流器用作配电静态补偿器，通过减少谐波、以单位功率因数平衡电网电流来改善电网的电能质量。它在弱电网情况下也表现良好，如电压失真、电网故障、直流偏移、电压不平衡和骤升/骤降。这项工作的主要目标是从不平衡电压中提取正序分量以进行单元模板估计，TOCF 算法提取负载电流的基本分量。PV 功率项用于提高系统性能。这项工作通过在 MATLAB 中模拟系统的行为，证明了控制算法在各种动态条件下的有效性。对实验室实现的实验装置进行了负载不平衡、电压不平衡、电压畸变、电压骤升/骤降、日照变化、DSTATCOM-PV模式、PV-DSTATCOM模式等不同异常情况的测试，系统运行良好正如 IEEE 标准 519 所建议的那样，电网电流中的失真水平在界限内。