考虑高比例多元调节资源互动的配电网无功优化降损方法

doi:10.11930/j.issn.1004-9649.202308071

摘要/Abstract

摘要：

为了挖掘高比例分布式资源接入背景下配电网全方位多角度无功调控降损潜力，实现更为全面精细的无功优化技术降损目标，提出考虑多元可调节资源协调互动的多目标配电网无功优化降损方法。首先，针对高比例分布式资源接入背景下谐波对线损的影响，给出了考虑谐波损耗的配电网线损计算模型；其次，在此基础上分析多元可调节资源无功调节能力，建立了以日线损最低和静态电压稳定性最大为目标的配电网无功优化调度模型；然后，通过制定多元可调节负荷、分布式电源、储能、无功补偿设备等多元分布式资源协同无功优化策略，达到在综合考虑配电网静态电压稳定性要求下系统线损最小的目的；最后，通过多元分布式资源接入的IEEE 33节点进行系统仿真分析，结果表明通过多元可调节资源的充分互动能够有效提高系统电压稳定性，降低系统线损，实现配电网安全、经济运行。

关键词: 谐波潮流, 无功优化, 多元资源互动, 降损, 静态电压稳定性

Abstract:

Under the background of high proportion distributed resource access, in order to fully explore the loss reduction potential of reactive power regulation of the distribution network and reach the target of loss reduction through reactive power optimization technology more comprehensively and precisely, this paper proposes a multi-objective reactive power optimization and loss reduction method considering the coordination and interaction of multiple regulating resources in the distribution power grid. Firstly, regarding the impact of harmonics on line loss in the context of high proportion of distributed resource access, a distribution network line loss calculation model considering harmonic loss is put forward. On this basis, the reactive power regulation capability of multiple regulating resources is analyzed, and a distribution network reactive power optimization scheduling model is established with the objective set as the minimization of line loss and the maximization of static voltage stability. By developing the reactive power optimization strategy of multiple distributed resources such as multiple adjustable load, distributed power supply, energy storage and reactive power compensation equipment, the goal of minimizing the system line loss under the comprehensive consideration of the static voltage stability requirements of the distribution network is achieved. Finally, through the simulation analysis of the improved IEEE 33-bus system, the results show that the full interaction of multiple regulating resources can effectively improve the system voltage stability, reduce the system loss, and ensure the secure and economic operation of the distribution network.

Key words: harmonic currents, reactive power optimization, multiple resource interaction, loss reduction, static voltage stability

中图分类号:

TM73

马喜平, 李亚昕, 梁琛, 董晓阳, 徐瑞. 考虑高比例多元调节资源互动的配电网无功优化降损方法[J]. 中国电力, 2024, 57(1): 123-132.

Xiping MA, Yaxin LI, Chen LIANG, Xiaoyang DONG, Rui XU. Reactive Power Optimization for Loss Reduction of Distribution Network Considering Interactions of High Penetration Level of Multiple Regulating Energy Resources[J]. Electric Power, 2024, 57(1): 123-132.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202308071

https://www.electricpower.com.cn/CN/Y2024/V57/I1/123

图/表 13

图 1 改进的IEEE 33节点系统

Fig.1 Improved IEEE 33 bus system diagram

表 1 算例主要参数

Table 1 The main parameters of the case

设备类型	内容	数值
分布式光伏电源	节点3光伏电源额定功率/kW	600
	节点12光伏电源额定功率/kW	820
	节点29光伏电源额定功率/kW	820
并联电容器组	总容量/(kV·A)	10×20组×3
储能设备群	最大充放电功率/kW	540
	充放电效率	0.9
	额定容量/(kW·h)	900

表 2 可调控负荷相关参数

Table 2 Related parameters of adjustable load

负荷类型	设备数量/台	单台额定功率/kW
可中断负荷	20	10.0
可时移负荷	67	3.0
可削减负荷	118	2.2

表 3 光伏接入容量以及对应的谐波线损

Table 3 PV access capacity and corresponding harmonic line losses

变量	数值
接入容量/kW	140	420	700	1400	2240	2520	2800
接入占比/%	5	15	25	50	80	90	100
日线损电量/(kW·h)	731	648	600	585	625	748	1014
谐波日线损电量/(kW·h)	0.24	1.38	4.11	20.4	33.6	60.3	105.0
谐波损耗占总线损比例/%	0.03	0.21	0.69	3.51	5.32	8.06	10.36

表 4 谐波损耗占谐波总损耗比例

Table 4 Proportion of harmonic losses in the total harmonic losses

变量	谐波次数
变量	5	7	11	13	17	19
谐波总损耗/(kW·h)	33.6
各次谐波损耗/(kW·h)	15.3	8.6	4.1	3.1	2.1	0.5
各次损耗占总损耗比例/%	45.4	25.7	12.1	9.1	6.2	1.5

表 5 配电网线损和L指标变化情况

Table 5 Changes of distribution network line losses and L indicators

变量	优化前	优化后
W_loss/(kW·h)	829.180	662.620
L_zb	0.200	0.157

图 2 关口有功功率及无功需求

Fig.2 Gate active power and reactive power demand

图 3 静态电压稳定L指标

Fig.3 Quiescent voltage stable L specification

图 4 优化前后储能及总光伏无功出力

Fig.4 Storage and total PV reactive power output before and after optimization

图 5 并联电容器组投切数量

Fig.5 Shunt capacitor bank switching quantity

图 6 优化前后可中断负荷无功需求

Fig.6 Reactive power demand of interruptible load before and after optimization

图 7 优化前后可削减负荷无功需求

Fig.7 Load reactive power demand reduction before and after optimization

图 8 优化前后系统无功需求与无功补偿对比

Fig.8 Comparison of system reactive power demand and reactive power compensation before and after optimization

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