Over the last decades, the deployment of large solar-based photovoltaic power plants has grown tremendously. The undesirable impact of high integration level of photovoltaic systems has led energy stakeholders to regulate such penetration to avoid this negative impact. One major concern with regard to photovoltaic penetration is the issue of power quality. Poor power quality can be a source of system disturbance and major economic losses. However, the power quality analysis is not widely discussed in the literature, with most of the studies focusing on the harmonic issues as potential power quality problem, but this study shows that there are a number of power quality issues, such as undervoltage, overvoltage, power fluctuation, and power factor. This study presents practical approaches to a grid-connected solar photovoltaic plant with associated control circuits developed in the time-domain. The power quality of a grid-connected solar photovoltaic plant is investigated by an analysis of the inverter output voltage and nominal current for different photovoltaic plant sizes. Also, the effect of different conditions of solar irradiance and ambient temperature on the power quality is analyzed. To identify power quality issues, a photovoltaic plant time-domain model is developed using Power Systems Computer Aided Design software. Various solar photovoltaic plant controls such as maximum power point tracking and modulation signals sinusoidal pulse width modulation and pulse width modulation for direct current-to-direct current boost converter are developed and integrated into the simulation environment. Several case studies are performed taking into account different photovoltaic plant ratings such as 250 kW–3 MW, where the point of common coupling is monitored.

在过去的几十年中，大型太阳能光伏电站的部署有了巨大的增长。光伏系统高集成度的不良影响已导致能源利益相关者对这种渗透进行规范，以避免这种负面影响。关于光伏渗透的主要关注点是电能质量问题。电能质量差可能会导致系统干扰和重大经济损失。但是，电能质量分析在文献中并未得到广泛讨论，大多数研究都将谐波问题作为潜在的电能质量问题，但这项研究表明，存在许多电能质量问题，例如欠压，过压，功率波动和功率因数。这项研究提出了在时域开发具有相关控制电路的并网太阳能光伏电站的实用方法。通过分析不同规模光伏电站的逆变器输出电压和标称电流，研究了并网型太阳能光伏电站的电能质量。此外，分析了太阳辐照度和环境温度的不同条件对电能质量的影响。为了确定电能质量问题，使用Power Systems计算机辅助设计软件开发了光伏电站时域模型。开发了各种太阳能光伏电站控件，例如最大功率点跟踪和用于直流到直流升压转换器的正弦脉冲宽度调制和脉冲宽度调制的调制信号，并将其集成到仿真环境中。考虑到不同的光伏电站额定值（例如250 kW–3 MW），对几个案例研究进行了研究，在这些电站中，监控公共耦合点。