级联H桥光伏并网逆变器混合调制策略

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Abstract The single-phase cascaded H-bridge (CHB) inverters for grid-connection photovoltaic (PV) systems have been explored with the features of modular, low harmonics and so on. The power harvested from PV modules are different exceedly because of serious environment, or even one or more modules' power are equal zero that becoming dummy units which affect system's stability and redundancy. This paper proposes an improved hybrid modulation which is a mix of "staircase + pulse width modulation (PWM) +sorting algorithm". This method adopts low frequency staircase modulation to expand stable operating region fundamentally, and uses high frequency PWM modulation to shape the current and decrease its total harmonic distortion (THD). Moreover, sorting the errors of dc voltages to get maximum power point tracking (MPPT) control, then analyze this method's stable operating condition from active power point. The proposed hybrid modulation have simple control structure, and can control the dummy unit effectively with individual MPPT. Finally, the simulation and experiment results validate the effectiveness and feasibility of the developed ideal.

Key words： Cascaded H-bridge, dummy unit, hybrid modulation, sorting algorithm

Published: 04 January 2017

PACS:

TM464

Fund:光伏微电网关键技术研究及逆变设备研制资助项目（2015AA05- 0607）

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	Articles by authors
	Wang Fusheng
	Zhang Dehui
	Dai Zhiqiang
	Yang Le

Cite this article:

Wang Fusheng,Zhang Dehui,Dai Zhiqiang等. A Hybrid Control Scheme of Cascaded H-Bridge Inverters for Grid-Connection Photovoltaic Systems[J]. Transactions of China Electrotechnical Society, 2016, 31(增刊): 137-145.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I增刊/137

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