Abstract
With the development of renewable electric power generation and ultra-high voltage direct current (UHVDC) transmission, the transient overvoltage in the sending end electric power system with UHVDC occurs, but it is lack of quantitative transient voltage assessment index (TVAI) to assess the overvoltage. To deal with the above problems, this paper proposes a new quantitative transient voltage assessment index considering overvoltage and voltage dip in the sending end electric power system with UHVDC, and applies it to analyze different influencing factors of overvoltage and determine the dynamic reactive power compensation capacity. In detail, first, according to the principle of the transient voltage assessment index considering voltage dip and the overvoltage assessment index for the distribution network, a new transient voltage assessment index considering transient overvoltage in the sending end electric power system with UHVDC is proposed with the approximated step function. Then, based on the requirements of the system with UHVDC, the parameters of the proposed transient voltage assessment index are determined. Furthermore, with the absolute and relative sensitivity, the impact of the parameters of voltage dependent current order limiter and current control amplifier on the transient overvoltage is analyzed and compared quantitatively. Finally, the impact of reactive power compensation equipment, such as synchronous condenser, static var compensator, and static var generator, on the transient overvoltage of the system with UHVDC is compared quantitatively, and the reactive compensation capacity needed to maintain transient voltage security and stability is estimated. The two applications show the effectiveness and advantages of the proposed index in the sending end electric power system with UHVDC.
Highlights
With the development of renewable electric power energy in western China, a lot of ultra-high voltage direct current (UHVDC) projects had been planned to transmit the renewable electric power to the east of China
Recognizing the above problems, this paper presents a transient voltage assessment index (TVAI) considering transient overvoltage in the sending end electric power system with UHVDC, combining our two previously proposed indexes, i.e., the index considering transient voltage dip in Ref. [19], and the index considering the overvoltage of the distribution network in Ref. [26]
The contributions of this paper are as follows: (1) For the sending end electric power system with UHVDC, a new quantitative transient voltage assessment index (TVAI) considering transient voltage dip and transient overvoltage is proposed, and the related parameters are determined according to operation requirements of high voltage power systems with UHVDC, rather than the distribution network
Summary
With the development of renewable electric power energy in western China, a lot of ultra-high voltage direct current (UHVDC) projects had been planned to transmit the renewable electric power to the east of China. [26] proposed a TVAI considering overvoltage for the distribution network, but it is not suitable for high voltage power systems, especially the sending end electric power system with UHVDC. Recognizing the above problems, this paper presents a transient voltage assessment index (TVAI) considering transient overvoltage in the sending end electric power system with UHVDC, combining our two previously proposed indexes, i.e., the index considering transient voltage dip in Ref. (1) For the sending end electric power system with UHVDC, a new quantitative transient voltage assessment index (TVAI) considering transient voltage dip and transient overvoltage is proposed, and the related parameters are determined according to operation requirements of high voltage power systems with UHVDC, rather than the distribution network.
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