Comparison of Allowable Harmonic Emission Value Distribution Methods at the Point of Common Coupling of High Voltage System

doi:10.11930/j.issn.1004-9649.202404023

Abstract

Abstract:

With a large number of nonlinear loads connected to the power grid, the harmonic problems caused by them are becoming more and more serious. Various countries or organizations have formulated harmonic standards to constrain the harmonic emission values of nonlinear users to ensure the waveform quality of the AC power grid. How to distribute the allowable harmonic emission value fairly and reasonably among power users has become a key issue. By comparing and analyzing the harmonic emission level distribution methods of nonlinear load access to high voltage system in IEC 61000-3-6, GB / T 14549 and IEEE Std.519, the applicability of each standard is evaluated by three principles of fairness, consistency and feasibility, and the consistency of the three is evaluated by comparing the case study results, which can provide some references for the revision of harmonic national standards.

Key words: harmonic standard, IEC 61000-3-6, GB/T 14549, IEEE Std.519, harmonic emission, distribution

Shun TAO, Huilin CHEN, Yonghai XU, Shengjun ZHOU, Xiangning XIAO. Comparison of Allowable Harmonic Emission Value Distribution Methods at the Point of Common Coupling of High Voltage System[J]. Electric Power, 2025, 58(1): 1-14.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202404023

https://www.electricpower.com.cn/EN/Y2025/V58/I1/1

Figures/Tables 20

Table 1 Phase superposition coefficient of harmonics

h		h＜5		5≤h≤10		h＞10
α		1.0		1.4		2.0

Fig.1 IEC power supply capacity definition

Table 2 Phase superposition coefficient of harmonics

h		3		5		7		11		13		9 \|＞13 \|偶次
α		1.1		1.2		1.4		1.8		1.9		2

Fig.2 Calculation of power supply capacity of high voltage side bus in substation

Table 3 Basis for harmonic current limits for rated voltage 69 kV and below

公共连接点处短路比（${{{S_{ \rm sc}}} \mathord{\left/ {\vphantom {{{S_{ \rm sc}}} {{S_{ i}}}}} \right. } {{S_{ i}}}}$）	单次谐波电压最大值/%	相关的假设
10	2.5~3.0	专用电网（系统）
20	2.0~2.5	1~2个大型用户
50	1.0~1.5	几个相对较大的用户
100	0.5~1.0	5~20个中型用户
1000	0.05~0.10	许多小用户

Fig.3 Calculation results based on the limit range of the maximum single harmonic voltage

Table 4 Harmonic current limits for the system with rated voltage 69 kV to 161 kV 单位：%

I_sc/I_L	以$ {I_{\rm L}} $百分数表示的最大单个谐波电流畸变
	谐波次数
	3≤ h＜11	11≤ h＜17	17≤ h＜23	23≤ h＜35	35≤ h≤50	I_TDD
＜20	2.0	1.00	0.75	0.30	0.15	2.5
20＜50	3.5	1.75	1.25	0.50	0.25	4.0
50＜100	5.0	2.25	2.00	0.75	0.35	6.0
100＜1000	6.0	2.75	2.50	1.00	0.50	7.5
＞1000	7.5	3.50	3.00	1.25	0.70	10.0

Table 5 Harmonic current limit for the system with rated voltage higher than 161 kV 单位：%

I_sc/I_L	以$ {I_{\rm L}} $百分数表示的最大单个谐波电流畸变
	谐波次数（奇次谐波）
	3≤h＜11	11≤h＜17	17≤h＜23	23≤h＜35	35≤h≤50	I_TDD
＜25	1.0	0.5	0.38	0.15	0.10	1.50
25＜50	2.0	1.0	0.75	0.30	0.15	2.50
≥50	3.0	1.5	1.15	0.45	0.22	3.75

Fig.4 Verification case

Table 6 Power supply capacity of each bus

a）双电源供电系统
母线	供电容量/(MV·A)
母线	IEC 61000-3-6	GB
母线3	0	800	750
母线4	0
母线5	240
母线6	126
母线7	74
母线8	360
供电容量总和	800	800	750
b）π型辐射结构系统
母线	供电容量/(MV·A)
母线	IEC 61000-3-6	GB
母线2	0	240
母线3	140
母线4	100
供电容量总和	240	240
c）单一干线辐射结构系统
母线	供电容量/(MV·A)
母线	IEC 61000-3-6	GB
母线2	190	240
母线4	50	50
供电容量总和	240	290

Fig.5 The harmonic current value distributed by the dual power supply system

Fig.6 The harmonic current value distributed by the system with π-type radiation structure

Fig.7 Th harmonic current value distributed by the system with single trunk radiation structure

Fig.8 Consistency evaluation results of dual power supply system

Fig.9 Consistency evaluation results of π-type radiation structure system

Fig.10 Consistency evaluation results of single trunk radiation structure system

Fig.11 Resonance amplification results of π-type radiation structure under different loads

Fig.12 Resonance amplification results of different nodes of π-type radiation structure under same load

Fig.13 Harmonic current value distributed by π-type radiation structure system (20% load)

Fig.14 Consistency evaluation results of π-type radiation structure system (20% load)

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