Real-time Performance Validation of a NSC based Microgrid during Grid disconnection

Abhijeet Choudhury, S. Pati, Renu Sharma, S. Kar, Akanksha Naik, Anargha Mudgalayan Nayak, Lohit Ranjan Lenka
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Abstract

This paper presents a grid-connected hybrid microgrid system with improved power quality and an uninterruptible power supply. The proposed microgrid integrates a photovoltaic (PV) system equipped with battery energy storage (BES) with the conventional grid. These power sources are integrated using a nine-switch converter (NSC). Though NSC comprises two 3-phase AC terminals, one set of three-phase terminals is connected to the utility grid and the load is connected to the other set of three-phase terminals of NSC. Two different control algorithms are designed, namely load side voltage control algorithm which helps in keeping the load voltage at a constant value irrespective of source variation or disconnection. And on the other hand, the PQ control algorithm is designed to control both the real and reactive power at a constant value irrespective of any disturbance. The proposed work mainly focuses on source disconnection, and power management during source or grid disconnection. The proposed microgrid is implemented in real-time using the OPAL-RT platform and the results are verified.
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基于NSC的微电网断网时的实时性能验证
本文提出了一种电能质量得到改善且具有不间断电源的并网混合微电网系统。所提出的微电网将配备电池储能(BES)的光伏(PV)系统与传统电网集成在一起。这些电源使用九开关转换器(NSC)集成。NSC由两个三相交流端子组成,其中一组三相端子连接到公用电网,负载连接到NSC的另一组三相端子。设计了两种不同的控制算法,即负载侧电压控制算法,无论电源变化或断开,都有助于保持负载电压恒定值。另一方面,PQ控制算法被设计成在不受任何干扰的情况下将实功率和无功功率都控制在一个恒定值。提出的工作主要集中在电源断开和电源或电网断开时的电源管理。利用OPAL-RT平台对所提出的微电网进行了实时实现,并对结果进行了验证。
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