| 弱电网下光伏并网逆变器稳定运行组合控制策略 |
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| 引用本文： | 王力为.弱电网下光伏并网逆变器稳定运行组合控制策略[J].太阳能学报,2022,43(7):86-92. |
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| 作者姓名： | 王力为 |
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| 作者单位： | 西南石油大学电气信息学院,成都 610500 |
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| 基金项目： | 国家自然科学基金（51877141）；;成都市科技项目（2021-RK00-00016-ZF）； |
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| 摘 要： | 为提高弱电网下光伏接入的并网电流质量和系统的稳定裕度,提出一种基于公共耦合电压点的选频前馈结合相位超前校正的组合控制新策略,该策略设计选频环改善电网电压前馈函数,使其既保留对电网背景谐波的抑制,又避免稳定裕度的下降,同时提出在电流通路中设计超前补偿校正环节,补偿弱电网阻抗引起的系统相角裕度下降,增加稳定裕量,从而提高光伏并入弱电网的并网电流质量和系统的稳定裕度。通过仿真和实验验证该策略对谐波抑制和稳定裕度提高的有效性。
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| 关 键 词： | 弱电网 光伏 并网逆变器 稳定裕度 选频前馈控制 |
| 收稿时间： | 2021-08-09 |
COMBINED CONTROL STRATEGY FOR STABLE OPERATION OF PHOTOVOLTAIC CONNECT-GRID INVERTER IN WEAK GRID |
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| Wang Liwei.COMBINED CONTROL STRATEGY FOR STABLE OPERATION OF PHOTOVOLTAIC CONNECT-GRID INVERTER IN WEAK GRID[J].Acta Energiae Solaris Sinica,2022,43(7):86-92. |
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| Authors: | Wang Liwei |
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| Affiliation: | School of Electrical Information, Southwest Petroleum University, Chengdu 610500, China |
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| Abstract: | In order to improve the stability of photovoltaic grid connected system in weak grid,a compound control strategy based on common coupling voltage frequency-selecting feedforward and phase lead compensation is proposed in the paper. In this strategy, frequency-selecting is designed to improve the feedforward function of grid voltage. It can not only keep the suppression of background harmonics,but also avoid the sharp decrease of stability margin. And it is proposed that the phase-leading link is added to the current path to compensate the decrease of phase angle margin caused by the impedance of weak grid and increase the stability margin. The effectiveness and feasibility of the strategy are verified by the simulation and the experiment. |
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| Keywords: | weak grid PV grid-connected inverter stability margin frequency-selection feedforward control |
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