| Line-line fault protection scheme of PV array based on current reverse mutation criterion of fault PV string |
| 投稿时间：2022-09-19 修订日期：2023-06-05 |
| 查看全文(View full text) View / Add Comment Download PDF Reader |
| English Abstract: |
| The fault current is small when line-line fault occurs in the photovoltaic(PV) array, and overcurrent protection cannot effectively clear the fault. A PV array line-line fault protection scheme based on the reverse mutation characteristics of PV string output current is proposed. The characteristics of the PV string’s output voltage and current under PV array line-line fault are qualitatively analyzed, which shows that the current will reversely decrease under PV array line-line fault. Then, based on the equivalent circuit model of PV string, the quantitative relationship between the output current and the number of the faulty battery is established. Setting the current reduction for one faulty battery as the threshold, a current reverse mutation criterion of fault PV string is proposed, which can effectively locate the fault string of PV array and only need to measure the output current signal of the PV string and the output voltage signal of the PV array. Meanwhile, the protection cooperation only need trip signal. The correctness of the theoretical analysis of the proposed criterion and the effectiveness of the proposed relay protection scheme are verified by time-domain simulations and field test. |
|
| English and key words:PV power generation PV array line-line fault fault current reverse mutation relay protection |
| 基金项目:国家电网有限公司总部科技项目(5400-202323225A-1-1-ZN)；江西省急需紧缺海外人才项目(20223BCJ25031) |
| DOI：10.16081/j.epae.202308021 |
| Colse |
