近年来，随着用电负荷及输电距离的不断增长，原有中低压末端供电网络已无法满足用户所需的供电质量。为了解决上述问题，可以采用多种方法。如架设新的供电线路、提高线路电压等级、加装补偿装置、更换扩径导线等。然而，架设新的供电线路和提高输电线路电压等级不仅需要拓宽供电走廊，还需要提高绝缘水平，并且投资大且周期长。相比之下，采用加装补偿装置技术不仅投资较少，而且效果明显。因此，本文主要研究采用静止同步串联补偿器来解决中低压长距离输电中存在的末端电能质量问题。

首先，论文从调控线路电流、调控线路功率、注入无功功率、伏安特性、阻抗特性等多个方面对静止同步串联补偿器进行性能分析，结果表明静止同步串联补偿器具有较好的电压动态响应能力和无功功率控制能力；然后推导并建立了恒阻抗模型，并设计了由阻抗环、电压环构成的双闭环BAS-PID控制策略。为了验证所设计的静止同步串联补偿器的方案，对所设计方案的补偿过程以及补偿效果进行了Matlab/Simulink仿真验证，分析了控制策略及模型的有效性；在建立优化后的静止同步串联补偿器投切模型的基础上给出了投切方案，避免了静止同步串联补偿器投切时产生振荡电压，达到了提高了线路末端电能质量的目的，并采用Matlab/Simulink验证了该投切方法的可行性。最后通过工程实践对静止同步串联补偿方案的性能和补偿效果进行了验证分析，结果表明补偿后的末端电压为9.723kV相，相比补偿前的9.278kV提高了4.800%，输电线路的功率相对补偿前的2.103MW提高了14.700%，在同样运行条件下，线损降低了11.8kW，6个月总共节省50976度电。

结果表明，本文设计的10kV长距离输电网串联补偿策略能够有效提升中低压长距离输电中的末端电能质量并且易于实施，为改善区域中低压供电线路的末端供电质量提供了参考。

In recent years, with the continuous growth of electricity load and transmission distance, the original medium and low voltage terminal power supply network has been unable to meet the power supply quality required by users. To address the above issues, multiple methods can be used. For example, installing new power supply lines, increasing the voltage level of the lines, installing compensation devices, and replacing expanded conductors. However, installing new power supply lines and increasing the voltage level of transmission lines not only requires expanding the power supply corridor, but also improving the insulation level, which is costly and time-consuming. In contrast, adopting the technology of installing compensation devices not only requires less investment, but also has significant effects. Therefore, this article mainly studies the use of static synchronous series compensators to solve the terminal power quality problems in medium and low voltage long-distance transmission.

Firstly, the paper analyzes the performance of the static synchronous series compensator from multiple aspects such as regulating line current, regulating line power, injecting reactive power, volt ampere characteristics, impedance characteristics, etc. The results show that the static synchronous series compensator has good voltage dynamic response ability and reactive power control ability; Then, a constant impedance model was derived and established, and a dual closed-loop BAS-PID control strategy consisting of an impedance loop and a voltage loop was designed. In order to verify the design scheme of the static synchronous series compensator, Matlab/Simulink simulation was conducted to verify the compensation process and effect of the designed scheme, and the effectiveness of the control strategy and model was analyzed; On the basis of establishing an optimized switching model for the static synchronous series compensator, a switching scheme was proposed to avoid the generation of oscillation voltage during the switching of the static synchronous series compensator, achieving the goal of improving the power quality at the end of the line. The feasibility of this switching method was verified using Matlab/Simulink. Finally, the performance and compensation effect of the static synchronous series compensation scheme were verified and analyzed through engineering practice. The results showed that the compensated terminal voltage was9.723kV phase, which was 4.800% higher than the 9.278kV phase before compensation. The power of the transmission line was 14.700% higher than the 2.103MW phase before compensation. Under the same operating conditions, the line loss was reduced by 11.8kW, saving a total of 50976 kWh in 6 months.

The results indicate that the series compensation strategy designed in this article for 10kV long-distance transmission networks can effectively improve the end power quality in medium and low voltage long-distance transmission and is easy to implement, providing a reference for improving the end power quality of regional medium and low voltage power supply lines.

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