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Zang C.,Huazhong University of Science and Technology | He J.,Huazhong University of Science and Technology | Pei Z.,Xian Electrical Manufacturing Corporation | Gou R.,Xian Electrical Manufacturing Corporation | And 2 more authors.
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2010

In the study of STATCOM, the control theory and method has become increasingly mature, but how to make use of the high performance microprocessors and new devices as the trigger circuit hardware is still a focus. Digital trigger system, including the pulse generator and its peripheral circuit, is a key technology of STATCOM. As the trigger angle changes in the range of only several degrees in the operation of the STATCOM, there is a high requirement on the design and implementation of trigger system. Aimed at this status, the paper compares several popular design schemes of STATCOM trigger system, sums up the characteristics and requirements of the trigger system, and gives out the design content, logic realization and attentions of a general design mode of the digital trigger system. This study may be also a reference for the design of other types of FACTS controllers and trigger systems. ©2010 IEEE.

Zang C.-Y.,Huazhong University of Science and Technology | Zang C.-Y.,Xian Electrical Manufacturing Corporation | Pei Z.-J.,Xian Electrical Manufacturing Corporation | He J.-J.,Huazhong University of Science and Technology | And 3 more authors.
Gaoya Dianqi/High Voltage Apparatus | Year: 2010

The cascaded STATCOM has been widely used in various STATCOM prototypes and projects due to its advantages such as low loss, high efficiency, little harmonic content in output voltage, easy modularization, and so on. However, this kind of STATCOM structure contains inherent unbalance capacitor voltage in the DC-link, which may lead to abnormal running of STATCOM. This paper analyzes various factors which may influence this unbalance capacitor voltage, and considers parallel connection loss, mixed loss and pulse delay as the main influence factors. It sums up four common control strategies as viewed from energy balance, and three common control strategies as viewed from control variable. In addition, this paper introduces a novel DC-link capacitor voltage control strategy with convenient software implementation, and offers some recommendations. Its work can be helpful to the STATCOM designers.

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