Capacitor voltage balancing is indispensable in normal operation for modular multilevel cascade converter- single star bridge cell (MMCC-SSBC) based static synchronous compensator (STATCOM). This paper proposes a novel individual voltage balancing scheme with dramatically reduced voltage sensors. First, zero-sequence voltage injection is enabled to regulate the cluster voltage based on only one voltage sensor in each phase; Then, through the additional inserted hardware units, individual voltage balancing can be achieved. Compared with conventional software voltage balancing method, the proposed balancing scheme has the advantage of simple implementation, lower transportation delay, fast balancing speed, and dramatically reduced voltage sensors. In addition, only some popular power modules are added to balance the individual capacitor voltage. The effectiveness of the proposed individual voltage balancing scheme is verified by simulation results in MMCC-SSBC based STATCOM. With the proposed scheme, the individual voltage balancing and reactive power compensation can be realized simultaneously.
|Title of host publication||2019 Tsinghua International Doctoral Forum|
|Publisher||Institution of Engineering and Technology|
|Publication status||Published - 2019|
|Event||2019 Tsinghua International Doctoral Forum - Beijing, China|
Duration: 22 Nov 2019 → 24 Nov 2019
|Conference||2019 Tsinghua International Doctoral Forum|
|Period||22/11/2019 → 24/11/2019|
Bibliographical noteFunding Information:
This work was supported in part by the National Key Research and Development Foundation of China under Grant (2017YFB0903300), and in part by the National Natural Science Foundation of China under Grant (U1766210, 51625702, and 51807135).
© 2019 Institution of Engineering and Technology. All rights reserved.
Copyright 2020 Elsevier B.V., All rights reserved.
- Individual voltage balancing
- Modular multilevel cascade converter (MMCC)
- Reduced voltage sensors
- Single star bridge cell (SSBC)