10kV配电网典型负荷结构串联电容补偿临界补偿长度研究

Study on Critical Compensation Length of Series Capacitor Compensation for Typical Load Structure of 10kV Distribution Network

配电网是电力系统直接连接用户的关键供电环节,保证配电网沿线电压质量直接影响到用电设备的安全性、经济性。采用串联电容补偿装置来补偿线路的电抗,可以有效提高交流输电线输电能力、提高系统的稳定性和电压质量。线路供电半径较大、末端负荷较重时,线路沿线电压降严重,此时单一的补偿方式很难满足要求,需要其他补偿方式共同补偿。本文针对10 kV配电网5种典型的负荷结构,采用数值仿真的方法研究了不同复合结构、不同补偿度的串补效果,旨在分析探究单一串补方式下能使沿线负荷电压均满足幅值质量要求的临界补偿长度,同时也研究了负荷容量及功率因数等参数对补偿效果的影响。

The distribution network is the key power supply link for the direct connection of the power system to the user and assurance of voltage quality along the distribution network directly affects the safety and economy of the power equipment.The use of series capacitance compensation deviceto compensate the reactance of the linecan effectively improve the transmission capacity of the AC transmission line,improve the stability of the system and the voltage quality.In case of large power supply radius of lien and heavy load at the end,the voltage drop along the line is very serious and,at this time,a single compensation method is difficult to meet the requirements,and other compensation methods are needed to compensate together.As for the five typical load structures of 10 kV distribution network in this paper,the numerical simulation method is used to study the series compensation effects of different composite structures and different compens ationd egrees with purpose of analyzing the singles eries compen sation mode tomake the loadvol tage along the line meet the amplitude.The critical compensation length of the quality requirement is also stud⁃ied.Meanwhile,the effects of load capacity and power factor on the compensation effect are also studied.