Modeling development of converter topologies and control for BTB voltage source converters. Final report
- ABB Power T and D Company, Inc., Raleigh, NC (United States)
This report presents the results of an investigation into the merits of using a back-to-back voltage source converter (BTB-VSC) as an alternative to a conventional back-to-back high voltage DC link (HVDC). The report presents the basic benefits of the new technology along with the basic control blocks needed to implement the design. The report also describes a model of the BTB-VSC implemented in EMTDC{trademark} and discusses the use of the model. Simulation results, showing how the model responds to various control actions and system disturbances, are presented. This modeling work developed a detailed EMTDC{trademark} model using the appropriate converter technology and magnetic interface configuration. Various possible converter and magnetic interface configurations were examined and the most promising configuration was used for the model. The chosen configuration minimizes the number of high voltage transformers needed and minimizes the complexity non-standard interfacing transformers. There is no need for transformers with phase shifts other than zero or thirty degrees (wye-wye or wye-delta). The only non-standard feature is the necessity of bringing the neutral side of the high voltage winding on the wye-wye unit out through bushings and to insulate the wye-wye transformer for the system voltage which is twice the transformer winding voltage. The developed EMTDC{trademark} model was used to demonstrate the possibility of achieving independent control of the real power transmitted and the voltages at the AC terminals. The model also demonstrates the ability to interconnect weak AC systems without the necessity of additional voltage support equipment as is the case with the conventional back-to-back DC interconnection. The model has been shown to work with short circuit ratios less than 2 based on the total rating of the high voltage transformers.
- Research Organization:
- Electric Power Research Inst. (EPRI), Palo Alto, CA (United States); ABB Power T and D Company, Inc., Raleigh, NC (United States)
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 355066
- Report Number(s):
- EPRI-TR-111182; TRN: AHC29924%%272
- Resource Relation:
- Other Information: PBD: Aug 1998
- Country of Publication:
- United States
- Language:
- English
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