This paper proposed two PWM control scheme which is the Voltage Oriented Control (VOC) and Direct Power Control (DPC) on a heavy loaded LV-distribution network with photovoltaic (PV) integration in Malaysia. The surge in demand of power supply is overcome by deploying more PV to fulfil the load demand. However, this could give rise to power quality issues that can affect the stability of the grid. The focus in this work is to solve voltage dynamic concern which results in over and undervoltage problems within the distribution network and at the same time to evaluate on the performance of both control schemes under a heavy loaded condition. A 33 kV Malaysian LV-Distribution model integrated with PV is constructed to serve as a base model in this paper. From the base model, a load flow analysis is conducted in order to locate the weakest bus. The two proposed control schemes are introduced into the weakest bus in the grid system, and its performance of the controller will be evaluated based on three aspects such as compensation margin, voltage and current total harmonics distortion (vTHD and iTHD) and lastly the compensated voltage levels. It is shown that VOC control scheme has outperformed DPC due to a wider compensation margin and its ability to achieve the desired reference voltage with a faster settling time under heavy loaded condition. Therefore, the proposed PWM control scheme of both VOC and DPC under a heavy load scenario could be set as a benchmark to provide impactful insights and findings towards an actual implementation of the application within a distribution network or distributed generation.

中文翻译：

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马来西亚配电代表网络重载应用中解决欠压和过压条件的面向电压控制和直接功率控制策略

本文提出了两种 PWM 控制方案，即电压定向控制 (VOC) 和直接功率控制 (DPC)，用于马来西亚具有光伏 (PV) 集成的重载低压配电网络。通过部署更多的光伏以满足负载需求，克服了供电需求的激增。但是，这可能会引起电能质量问题，从而影响电网的稳定性。这项工作的重点是解决导致配电网内过压和欠压问题的电压动态问题，同时评估两种控制方案在重载条件下的性能。本文构建了一个与光伏集成的 33 kV 马来西亚低压配电模型作为基础模型。根据基本模型，进行潮流分析以定位最弱的母线。将提出的两种控制方案引入电网系统中最弱的母线，将根据补偿裕度、电压电流总谐波失真（vTHD 和 iTHD）以及补偿电压三个方面来评估控制器的性能。水平。结果表明，VOC 控制方案的性能优于 DPC，因为它具有更宽的补偿裕度，并且能够在重载条件下以更快的建立时间实现所需的参考电压。因此，在重负载情况下提出的 VOC 和 DPC PWM 控制方案可以设置为基准，为配电网络或分布式发电中的应用程序的实际实施提供有影响力的见解和发现。