远距离交直流混联输电系统频率稳定性研究 *

doi:10.11985/2019.04.002

摘要/Abstract

摘要：

针对交直并联运行和非并联运行两种输电模式当中,当直流输电系统的输送功率因故障而下降时,对交流输电系统频率稳定性的影响问题,进行了相关的理论推导和仿真分析。首先,分析了影响并联和非并联结构的交直流混联输电系统频率稳定性的主要因素;其次,在直流系统发生故障时和不同输电距离条件下,利用PSCAD/EMTDC仿真软件,分别建立了六机四区域和四机两区域输电系统模型,对两种结构的输电系统进行仿真分析;最后,从仿真结果可得影响交直流混联输电系统远距离、大容量输电时的频率稳定性的主要因素,进而完善了混联电网远距离、大容量输电时的稳定性评价指标。研究结果对远距离交直流混联输电系统的稳定运行具有一定的指导意义。

关键词: 交直流混联输电, 功率转移, 频率稳定性, 并联运行, 非并联运行

Abstract:

For the two transmission modes of AC-parallel operation and non-parallel operation, when the transmission power of the DC transmission system drops due to the fault, the related theoretical derivation and simulation analysis are carried out on the influence of the frequency stability of the AC transmission system. The main factors affecting the frequency stability of AC/DC hybrid transmission systems with parallel and non-parallel structures are analyzed. Secondly, under the condition of DC system failure and different transmission distances, six machines are established by PSCAD/EMTDC simulation software. The four-zone and four-machine two-region transmission system model simulates the transmission system of two structures. Finally, the main factors affecting the frequency stability of AC/DC hybrid transmission system over long-distance and large-capacity transmission are obtained from the simulation results. Furthermore, the stability evaluation index of the long-distance and large-capacity transmission of the hybrid power grid is improved. The research results have certain guiding significance for the stable operation of long-distance AC-DC hybrid transmission systems.

Key words: AC/DC hybrid transmission, power transfer, frequency stability, parallel operation, non-parallel operation

中图分类号:

TM762

郝晓弘,胡开伟,马明,周强,汪宁渤. 远距离交直流混联输电系统频率稳定性研究 ^*[J]. 电气工程学报, 2019, 14(4): 10-17.

Xiaohong HAO,Kaiwei HU,Ming MA,Qiang ZHOU,Ningbo WANG. Study on Frequency Stability of Long Distance AC/DC Hybrid Transmission System[J]. Journal of Electrical Engineering, 2019, 14(4): 10-17.

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运行模式	输送距离S/km	功率P₁/MW	功率P_ac₁/MW	功率P_ac₂/MW
并联结构	300	1 400	400	1 000
非并联结构	300	1 600	700	1 400

运行模式	输送距离S/km	功率$\Delta P_{ac1}$/MW	功率$\Delta P_{ac2}$/MW	频率$\Delta f_{1}$/Hz	频率$\Delta f_{2}$/Hz
并联结构	300	300	400	0.6~–0.8	0.6~–0.8
非并联结构	300	100	200	0.8	±0.4

运行模式	输送距离S/km	功率P₁/MW	功率P_ac₁/MW	功率P_ac₂/MW
并联结构	500	1 700	650	1 500
非并联结构	500	1 700	750	1 300

运行模式	输送距离S/km	功率$\Delta P_{ac1}$/MW	功率$\Delta P_{ac2}$/MW	频率 $\Delta f_{1}$/Hz	频率$\Delta f_{2}$/Hz
并联结构	500	150	300	±0.6	±0.6
非并联结构	500	150	150	1.25~–0.5	1.25~–0.5

运行模式	输送距离S/km	功率P₁/MW	功率P_ac₁/MW	功率P_ac₂/MW
并联结构	900	2 400	900	2 200
非并联结构	900	2 000	900	1 500