| Virtual resistance compensation control method for grid-connected inverter integrated with active damper function |
| 投稿时间：2023-02-07 修订日期：2023-07-23 |
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| English Abstract: |
| The active damper improves the stability of the inverter connected to the weak grid by construc-ting the virtual resistance, but the accuracy of virtual resistance is limited by the switching frequency, the active damper function is difficult to be integrated into the conventional grid-connected inverters, so a compensation control method of virtual resistance is proposed. An impedance model of grid-connected inverter integrated with active damper function is established, and the effect of virtual resistance in enhancing system stability is analyzed. The influence of control bandwidth and digital delay on the accuracy of virtual resistance is clarified, aiming at the resonant frequency band where the grid-connected inverter easily gene-rates resonant stability problems, a new virtual resistance compensation block is designed, which significantly improves the compensation accuracy of virtual resistance. The system impedance stability analysis shows that the virtual impedance achieved by the proposed method has good resistive characteristics. The experimental results show that the grid-connected inverter integrated with active damper function has good dam-ping resonant effect, significantly improving the system stability. |
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| English and key words:active damper grid-connected inverter weak grid stability virtual resistance |
| 基金项目:国网江苏省电力有限公司科技项目(J2021008) |
| DOI：10.16081/j.epae.202307024 |
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