Farm-level Interactions Study of a Novel Tri-port Soft-switching Medium-Voltage String Inverter (MVSI) based Large-scale PV-Plus-Storage Farms

2022 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2022-03-20 DOI:10.1109/APEC43599.2022.9773544

Vikram Roy Chowdhury, Z. An, R. Kandula, D. Divan

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引用次数: 1

Abstract

A medium-voltage photovoltaic power conversion unit supported by battery based on a novel topology of soft switching solid state transformer is presented in this paper. It can reduce the Levelized Cost of Energy (LCOE) of PVS farm in an extended degree. However, its capability to provide grid-support services, such as frequency response, reactive power support, etc, have not been demonstrated. A series/parallel combination of these modules form a large 20 MVA solar farm. To validate them with reduced computation burden, a small-signal model of MVSI is firstly derived and validated in this paper. The model has been validated to match the full-switch model in both steady-state and dynamic conditions. Next, a farm-level simulation based on the proved small-signal model was implemented to demonstrate grid-support services. Real irradiation date from NREL is used to show the operational capabilities of the system. The overall farm is simulated based on MATLAB/Simulink domain to check the performance for various cases namely: power transfer from dc-ac side, reactive power support during grid voltage sag and utilization of battery during grid voltage disturbance or partial shading over PV panels.

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基于新型三端口软开关中压串逆变器(MVSI)的大型光伏+储能电场电场级相互作用研究

提出了一种基于新型软开关固态变压器拓扑结构的电池支撑中压光伏电源转换装置。它可以在一定程度上降低光伏电站的平准化能源成本(LCOE)。然而，其提供电网支持服务的能力，如频率响应、无功支持等，尚未得到证实。这些模块的串联/并联组合形成一个20 MVA的大型太阳能发电场。为了减少计算量，对其进行验证，本文首先推导了MVSI的小信号模型并进行了验证。该模型在稳态和动态条件下都能与全开关模型相匹配。接下来，基于已验证的小信号模型实施了农场级仿真，以演示电网支持服务。使用NREL提供的真实辐照数据来显示系统的运行能力。基于MATLAB/Simulink域对整个电场进行仿真，以检查各种情况下的性能，即:直流-交流侧的电力传输，电网电压下降时的无功支持以及电网电压扰动或光伏板部分遮阳时电池的利用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2022 IEEE Applied Power Electronics Conference and Exposition (APEC)

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