特高压直流闭锁后的交直流混联受端电网最优切负荷方案

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特高压直流闭锁后的交直流混联受端电网最优切负荷方案

更新时间：2025-08-13

- 特高压直流闭锁后的交直流混联受端电网最优切负荷方案
- Automation of Electric Power Systems Vol. 42, Issue 22, Pages: 98-106(2018)
- 作者机构：
  
  西南交通大学电气工程学院,四川省,成都市,610031
- 作者简介：
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- DOI：
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- Published：2018
- 稿件说明：
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HU Yi. [J]. Automation of electric power systems, 2018, 42(22): 98-106.
DOI：

HU Yi. [J]. Automation of electric power systems, 2018, 42(22): 98-106. DOI：

摘要

交直流混联受端电网中大容量特高压直流(UHVDC)输电线路发生直流闭锁故障后，电网会产生巨大功率缺额，引起潮流大幅度转移和频率跌落，可能会造成交流通道过载，引发连锁故障。针对这一问题提出了一种交直流混联受端电网最优切负荷方案计算方法。该方法基于广域测量技术，利用直流闭锁后瞬间量测数据，建立闭锁后稳态时交流通道传输功率和电网频率的估算模型，考虑交流通道传输功率极限、电网频率安全约束及可切负荷的重要性差异，以负荷综合损失最小为目标，建立最优切负荷方案的优化模型。通过改进的粒子群优化(PSO)算法求解得到电网最优切负荷点及其对应的最优切负荷量，保证了直流通道闭锁之后，交直流混联受端电网的安全稳定运行。最后在机电暂态软件PSS/E中以IEEE 39节点改进系统为例，通过仿真分析对所提方法进行对比验证，证明了该方法的正确性和有效性。

Abstract

When the DC blocking fault occurs in the UHVDC of AC/DC hybrid system

the hybrid AC/DC receiving-end power grid may produce a huge power shortage

cause a significant power transfer and frequency drop

cause the AC channel overload

and even lead to chain failure. In order to solve this problem

a calculation method of optimal load shedding scheme is presented for hybrid AC/DC receiving-end power grid based on the wide-area measurement system(WAMS). The estimation model of AC channel transmission power and the frequency is established by using the instantaneous measurement data after DC blocking. Considering the AC channel transmission power limit

the grid frequency safety constraints

and the different importance of each load

the optimization model of the optimal load shedding is established with the objective of minimizing the total load shedding. Through the improved particle swarm optimization(PSO)algorithm

the optimal load shedding amount of each load is solved

which ensures the safe and stable operation of the hybrid AC/DC receiving-end power grid after the DC blocking. The improved IEEE 39-bus system is taken as an example in the PSS/E software. Simulations and analysis are carried out to validate the effectiveness and accuracy of the proposed method.

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