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| Fault characteristic analysis on the AC side of an MMC-HVDC transmission system connected to a wind-PV-thermal-energy storage system |
| DOI：10.19783/j.cnki.pspc.240572 |
| Key Words:wind-PV-thermal-storage system MMC-HVDC grid-following AC fault fault characteristics analysis |
| Author Name | Affiliation | | ZHANG Sheng1 | 1. School of Electric Power, Inner Mongolia University of Technology, Hohhot 010051, China
2. Inner Mongolia Electric Power Economic Research Institute, Hohhot 010090, China | | YANG Bingyuan1 | 1. School of Electric Power, Inner Mongolia University of Technology, Hohhot 010051, China
2. Inner Mongolia Electric Power Economic Research Institute, Hohhot 010090, China | | GONG Ziyuan2 | 1. School of Electric Power, Inner Mongolia University of Technology, Hohhot 010051, China
2. Inner Mongolia Electric Power Economic Research Institute, Hohhot 010090, China | | BAO Hongfeng1 | 1. School of Electric Power, Inner Mongolia University of Technology, Hohhot 010051, China
2. Inner Mongolia Electric Power Economic Research Institute, Hohhot 010090, China |
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| Abstract:A wind-PV-thermal-energy storage system (WPTESS) is bundled and transmitted using AC collection, MMC-HVDC transmission, and AC grid connection. Among them, short-circuit faults at the AC sending line will generate new fault characteristics. Firstly, the fault current characteristics are analyzed by combining the fault ride-through control strategies of the WPTESS and MMC-HVDC. When the voltage drops to a range between 0.2 p.u. and 0.9 p.u., the mechanism by which the fault current phase angle on both sides of the AC sending line is affected by the degree of voltage drop and the upper limit control of the amplitude limiting link is clarified through theoretical derivation. Using phasor analysis, it is revealed that the fault current phase angle on the WPTESS side is less than 75°, and on the MMC-HVDC side is less than 45°. The fault current amplitude characteristics under grounding faults and phase-to-phase faults are analyzed using fault sequence network. Secondly, considering the short-circuit ratio and using Thevenin’s equivalent method, the reasons for the reduction of fault current phase angle due to the increase in system short-circuit capacity caused by thermal power integration are explored. In addition, the characteristics of the fault current amplitude of a wind-PV-energy storage system varying proportionally with input power are analyzed. Finally, the correctness of the theoretical analysis is verified through RTDS simulation. |
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