The basic tenet of power grid design is to meet the safety and reliability ofpower transmission and distribution process,flexible adaptation of short-term and long-term development and economic rationality of power supply.The beam-pumping units and compressors in the gas gathering compression station are the main power loads of the coal-bed gas field,which require higher reliability of power source.The calculation and analysis of the preliminary design scheme of one coal-bed gas field demonstrate that using 35 kV voltage level limits the power supply capacity,reduces the voltage stability and lightning proof ability.Therefore,the scheme is optimized,and it is proposed to build one 110 kV main substation in the gas gathering center,and according to the distribution distance and load capacity of each station,35 kV and 10kV voltage are used respectively to distribute power.Substations or switching stations are built,which can improve the power supply capacity,voltage reliability and power supply stability.%电网设计的基本原则是满足电力输配过程的安全可靠性、近远景发展的灵活适应性及供电的经济合理性.煤层气田电力的主要负荷是游梁式抽油机和集气站压缩机,对电源可靠性要求较高.某煤层气田初步设计方案的计算分析表明,其选用35 kV电压等级限制了供电能力,降低了电压稳定性和防雷能力.因此,对方案进行了优化,建议在集气中心建设110 kV总变电站,按照各集气站配电距离的远近和负荷大小,分别采用35 kV、10 kV电压等级配电,建设变电站或开闭所,以提高供电能力、电压稳定性和供电可靠性.
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