Design and Analysis of a Grid-Connected Photovoltaic Power System

被引：358

作者：

Yang, Bo ^{[1
]}

Li, Wuhua ^{[1
]}

Zhao, Yi ^{[1
]}

He, Xiangning ^{[1
]}

机构：

[1] Zhejiang Univ, Coll Elect Engn, Hangzhou 310027, Peoples R China

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2010年 / 25卷 / 04期

基金：

中国博士后科学基金;

关键词：

Bidirectional power flow control; compensation units; direct current control; maximum-power-point-tracking (MPPT) method; photovoltaic (PV) system; steady-state model; HIGH-EFFICIENCY; CONVERTER; INVERTER;

D O I：

10.1109/TPEL.2009.2036432

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A grid-connected photovoltaic (PV) power system with high voltage gain is proposed, and the steady-state model analysis and the control strategy of the system are presented in this paper. For a typical PV array, the output voltage is relatively low, and a high voltage gain is obligatory to realize the grid-connected function. The proposed PV system employs a ZVT-interleaved boost converter with winding-coupled inductors and active-clamp circuits as the first power-processing stage, which can boost a low voltage of the PV array up to a high dc-bus voltage. Accordingly, an accurate steady-state model is obtained and verified by the simulation and experimental results, and a full-bridge inverter with bidirectional power flow is used as the second power-processing stage, which can stabilize the dc-bus voltage and shape the output current. Two compensation units are added to perform in the system control loops to achieve the low total harmonic distortion and fast dynamic response of the output current. Furthermore, a simple maximum-power-point-tracking method based on power balance is applied in the PV system to reduce the system complexity and cost with a high performance. At last, a 2-kW prototype has been built and tested to verify the theoretical analysis of the paper.

引用

页码：992 / 1000

页数：9

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