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Voltage Stability in Multi-infeed HVDC Transmission Systems

Author: LinWeiFang
Tutor: TangYong；BoGuangQuan
School: China Electric Power Research Institute
Course: Proceedings of the
Keywords: Multi-infeed AC and DC Short circuit ratio Critical short circuit ratio Voltage stability
CLC: TM721
Type: Master's thesis
Year: 2008
Downloads: 154
Quote: 0
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Abstract


Along with social progress and economic development, the growing demand for electricity. Uneven basic national conditions of China's energy and the development of the productive forces, the energy resources for large-scale, large-scale optimal allocation is imperative. DC transmission, the rapid development of its advantage on the large-capacity, long-distance transmission. China Southern Power Grid and East China Power Grid has emerged with the west to east, and the development of the national network, multi-infeed AC-DC system, multi-infeed AC-DC system more in-depth security evaluation, security and stability of the system running has a very important significance. This article describes the advantages and disadvantages of the DC transmission engineering overview of the development as well as domestic and foreign DC. Access to a large number of domestic and foreign literature focuses on the status of AC and DC transmission system voltage stability problems, especially for multi-infeed AC DC transmission system voltage stability issues in-depth study. AC and DC interaction depends largely on the AC system connected to the relative size of the DC system capacity, i.e. the short circuit ratio indicators. Based on the short-circuit ratio of voltage stability analysis is widely used in academic and engineering, it is to provide a reference basis for the planning of the system. For the traditional short-circuit than the interaction of DC HVDC system can not consider multi-feed, only applies to single-fed AC and DC systems, the new multi-infeed short circuit ratio is defined imminent. Academic definition of multi-infeed short circuit ratio is no uniform standard, this paper to trace the origin and derivation of the two kinds of multi-infeed short circuit ratio calculated by theoretical analysis, unified academia already on multi-fed short-circuit The ratio is defined. On this basis, we derived the functional relation between multi-infeed critical short-circuit ratio and critical effective short circuit ratio divided multi-infeed AC DC system strength standards. Weak AC system, never reactive power angle propose measures to improve the system running. By analyzing the relationship between multi-infeed DC power fed into the voltage stability factor to prove the feasibility of multi-feed into a short circuit for multi-infeed AC DC system voltage stability analysis. Finally, through a multi-feeding short-circuit ratio to evaluate the operation of the system of multi-infeed AC DC simulation study by the end of the dynamic multi-feed into a weak AC overvoltage, harmonic resonance, the voltage stability problems, through theoretical and numerical examples to prove the use of multi-fed short discriminant validity of the strength of multi-infeed AC system, the planning has an important guiding significance than the target.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Transmission and distribution technology > Transmission system
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