A Cost-Effective Decentralized Control for AC-Stacked Photovoltaic Inverters

A Cost-Effective Decentralized Control for AC-Stacked Photovoltaic Inverters
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一种经济高效的交流堆叠式光伏逆变器分散控制

DOI:
10.3390/en11092262
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发表时间:
2018-08
期刊:
影响因子:
3.2
通讯作者:
Josep Guerrero
Josep Guerrero
中科院分区:
工程技术4区
文献类型:
--
作者:
Hua Han;Chao Luo;Xiaochao Hou;Mei Su;Wenbin Yuan;Zhangjie Liu;Josep Guerrero

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对于具有N个级联逆变器的AC堆叠光伏(PV)逆变器系统,现有控制方法需要至少N个通信链路来获取电网同步信号。本文提出了一种新的分散控制。对于N个逆变器,只有最靠近公共耦合点(PCC)的一个逆变器需要通信链路来获取电网电压相位,所有其他N-1个逆变器仅使用本地测量信息来实现完全分散的本地控制。具体地,一个具有通信链路的逆变器利用电网电压相位并采用电流控制模式来实现所需的功率因数(PF)。其他逆变器只需要本地信息,没有通信链路,采用电压控制模式,实现最大功率点跟踪(MPPT)和与电网电压的自同步。与现有方法相比,大大减少了通信链路和复杂度,从而提高了可靠性,降低了通信成本。仿真试验验证了所提出控制方法的有效性。
For an AC-stacked photovoltaic (PV) inverter system with N cascaded inverters, existing control methods require at least N communication links to acquire the grid synchronization signal. In this paper, a novel decentralized control is proposed. For N inverters, only one inverter nearest the point of common coupling (PCC) needs a communication link to acquire the grid voltage phase and all other N − 1 inverters use only local measured information to achieved fully decentralized local control. Specifically, one inverter with a communication link utilizes the grid voltage phase and adopts current control mode to achieve a required power factor (PF). All other inverters need only local information without communication links and adopt voltage control mode to achieve maximum power point tracking (MPPT) and self-synchronization with grid voltage. Compared with existing methods, the communication link and complexity is greatly reduced, thus improved reliability and reduced communication costs are achieved. The effectiveness of the proposed control is verified by simulation tests.
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