Abstract
Large-scale synchronous condenser can provide a powerful dynamic reactive power for the Ultra high-voltage (UHV) Direct Current (DC) transmission system. The dynamic characteristics of synchronous condenser ensure the reactive power support capability in the case of grid fault. In this paper, the control strategy and deployment of the synchronous condensers in East China Power Grid are presented. Taking converter station as an example, this paper introduces the main architecture of automatic voltage control (AVC) system, and the relationship between host computers and slave computers. In the substation, it describes the mechanism of several control modes, and designs the on-site test scheme of the control modes. After on-site testing, the correct operation of the large-scale synchronous condensers can be guaranteed.
Highlights
The energy resources and loads are reversely distributed, and Ultra high-voltage (UHV)-Direct Current (DC) is often used for large-capacity transmission in China.[1]
The energy resources and loads are reversely distributed, and UHV-DC is often used for large-capacity transmission in China.[1]
The UHV-DC is injected, the conventional units are shut down to meet the requirements of UHV-DC power absorption and peak shaving
Summary
The energy resources and loads are reversely distributed, and UHV-DC is often used for large-capacity transmission in China.[1]. The reactive power and voltage support capacity of the system is insufficient and the overall regulation ability is reduced. On the other hand, according to HVDC design principles, under normal operating conditions, the reactive power exchange between the UHV-DC converter station and the system is zero, and the UHV-DC does not provide dynamic reactive power to the system. With the large-scale feeding of UHV-DC, especially in East China Power Grid, multiple UHV-DC commutation failure problems, voltage Stability problems are becoming more prominent.[2,3] The newgeneration condenser can provide dynamic voltage support through strong excitation to reduce the risk of commutation failure in the DC system. In East China Power Grid, with the continuous increase of UHV-DC input power from the outside. Taking UHV-DC converter station as an example, the on-site test scheme of the control modes is introduced
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