Harmonic Analysis of H Class Gas Turbine Generator Starting With Static Frequency Converter Based on Matlab/Simulink Simulation

doi:10.12096/j.2096-4528.pgt.19131

Abstract

Abstract:

With the development of gas-steam combined cycle power generation technology, the requirements of generator capacity and parameters are constantly improving. The generators of H class gas-steam combined cycle generator unit need to have more stable, efficient and safe starting requirements. It also stimulates improvement of static frequency converter (SFC) technology facing more challenge. SFC technology has displayed its advantages in controlling accurately, flexibly and efficiently. Meanwhile, SFC brings more harmonic components to influence the quality of power system. SFC start-up simulation model of H class gas turbine generator was built by Matlab/Simulink to simulate the generator start-up process, the evolvement of various parameters was researched and the proportion of harmonic components during the generator starting was analyzed. The simulation results show that the SFC start-up can increase the speed of the generator flexibly by adjusting the frequency and amplitude of the output current, and the impact of the generator start-up is small. However, large numbers of nonlinear electrical components built in SFC will cause higher proportion of harmonic components appear in power system and influence power quality. Therefore, two optimization schemes for SFC access were proposed to suppress harmonic effects, which are the scheme of adding input reactor before SFC and the scheme of changing generator end of input power supply. Through the simulation, it was proved that the two schemes can effectively suppress or reduce the harmonic effect and meet the requirements of power quality.

Key words: gas-steam combined cycle power generation, static frequency converter (SFC), variable frequency speed regulation, heavy duty gas turbine generator, harmonic analysis

CLC Number:

Kejia HU, Jun ZHANG, Tianyu ZHANG, Lixin GAO. Harmonic Analysis of H Class Gas Turbine Generator Starting With Static Frequency Converter Based on Matlab/Simulink Simulation[J]. Power Generation Technology, 2020, 41(6): 697-705.

Figures/Tables 18

Fig.1 SFC wiring schematic diagram

Fig.2 Matlab/Simulink model of generator starting with SFC

Fig.3 Rotor speed curve during generator starting with SFC

Fig.4 Stator current curve of generator starting with SFC

Tab. 1 Allowed harmonic values of current

短路容量	谐波次数
短路容量	2	3	4	5	6	7
国标6kV基准短路容量100MV?A	43	34	21	34	14	24
本模型6 kV最小短路容量 200 MV?A修正值	86	68	42	68	28	48
国标110 kV基准短路容量 750 MV?A(220 kV最小短路容量2 000 MV?A同等参照)	12.0	9.6	6.0	9.6	4.0	6.8

Tab. 2 Threshold of total distortion rate of harmonic voltage

电网标称电压/kV	电压总谐波畸变率/%
6	4
110(220kV同等参照)	2

Fig.5 6kV phase current curve

Fig.6 6kV phase to phase voltage curve

Fig.7 FFT analysis of current waveforms in three time periods

Tab. 3 Higher harmonic values of current waveform at t1=(0.20, 0.30)s

谐波	占比率/%	有效电流/A
基波	100	5309
2次谐波	0.89	47.25
3次谐波	0.23	12.21
4次谐波	0.11	5.84
5次谐波	0.07	3.72
6次谐波	0.03	1.59
7次谐波	0.04	2.12

Tab. 4 Higher harmonic values of current waveform at t2=(3.00, 3.10) s

谐波	占比率/%	有效电流/A
基波	100	2 979
2次谐波	1.22	36.34
3次谐波	0.68	20.26
4次谐波	0.54	16.09
5次谐波	0.36	10.72
6次谐波	0.30	8.94
7次谐波	0.26	7.75

Tab. 5 Higher harmonic values of current waveform at t3=(9.00, 9.10) s

谐波次数	占比率/%	有效电流/A
基波	100	947.8
2次谐波	0.18	1.71
3次谐波	0.06	0.57
4次谐波	0.05	0.47
5次谐波	0.04	0.38
6次谐波	0.01	0.09
7次谐波	0.03	0.28

Fig.8 Model of adding reactor to SFC

Fig.9 FFT analysis of current waveform at t1=(0.20, 0.30)s after adding reactor to SFC

Tab. 6 Higher harmonic value of current waveform at t1=(0.20, 0.30)s after adding reactor

谐波	占比率/%	有效电流/A
基波	100	2207
2次谐波	0.42	9.27
3次谐波	0.21	4.63
4次谐波	0.08	1.77
5次谐波	0.05	1.10
6次谐波	0.04	0.88
7次谐波	0.03	0.66

Fig.10 Model of SFC connecting between generator terminal and 220 kV main transformer

Fig.11 FFT analysis of current waveform at t1=(0.20, 0.30)s when SFC connecting between generator terminal and 220 kV main transformer

Tab. 7 Higher harmonic value of current waveform at t1=(0.20, 0.30)s when SFC connecting between generator terminal and 220 kV main transformer

谐波	占比率/%	有效电流/A
基波	100	212.2
2次谐波	5.36	11.37
3次谐波	1.04	2.21
4次谐波	0.65	1.38
5次谐波	0.39	0.83
6次谐波	0.32	0.68
7次谐波	0.35	0.74

References 15

1	蒋洪德, 任静, 李雪英, 等. 重型燃气轮机机现状与发展趋势[J]. 中国电机工程学报, 2014, 34 (29): 5096- 5098.
	JIANG H D , REN J , LI X Y , et al. Status and development trend of the heavy duty gas turbine[J]. Proceedings of the CSEE, 2014, 34 (29): 5096- 5098.
2	曹亮. SFC谐波滤波器的设计及应用[J]. 电工技术, 2017, 22 (4): 56- 57. DOI
	CAO L . Design and application of SFC harmonic filter[J]. Electric Engineering, 2017, 22 (4): 56- 57. DOI
3	曾令华, 程亮, 张靖宗. 交流变频调速系统仿真建模及谐波特性分析[J]. 发电技术, 2019, 40 (3): 294- 299.
	ZENG L H , CHENG L , ZHANG J Z . Simulation model of AC variable frequency speed regulation system and harmonic characteristics analysis[J]. Power Generation Technology, 2019, 40 (3): 294- 299.
4	宿清华.抽水蓄能电站SFC装置谐波分析及抑制措施研究[D].杭州: 浙江大学, 2002.
	SU Q H.Research on harmonic analysis and suppression measures of SFC device in pumped storage power station[D].Hangzhou: Zhejiang University, 2002.
5	王炜, 谭锦文, 颛孙旭, 等. 高渗透率并网风力发电的谐波特点及其抑制研究[J]. 电网与清洁能源, 2018, 34 (9): 59- 66. DOI
	WANG W , TAN J W , ZHUANG S X , et al. Study on harmonic characteristics and suppression of high-permeability grid-connected wind power generation[J]. Power System and Clean Energy, 2018, 34 (9): 59- 66. DOI
6	宋波. 谐波影响下电力电容器的协调无功降损方法[J]. 电网与清洁能源, 2019, 35 (11): 7- 12.
	SONG B . A method of coordinated reactive power loss reduction for power capacitors under the influence of harmonics[J]. Power System and Clean Energy, 2019, 35 (11): 7- 12.
7	鲁勇勤, 况明伟, 李宇俊, 等. 燃机变频启动系统技术引进和创新开发设计[J]. 东方电气评论, 2009, 23 (4): 43- 48.
	LU Y Q , Kuang M W , Li Y J , et al. Technical transfer and innovative design for SFC system of gas turbine generator units[J]. Dongfang Electric Review, 2009, 23 (4): 43- 48.
8	ABB.LCI基本原理及应用[Z].Zurich, Switzerland: ABB, 2016.
	ABB.LCI principle and application[Z].Zurich, Switzerland: ABB, 2016.
9	李发海, 王岩. 电机与拖动基础[M]. 4版北京: 清华大学出版社, 2012.
	LI F H , WANG Y . Fundamentals of electrical machines and drives[M]. 4th ed Beijing: Tsinghua University Press, 2012.
10	王兆安, 刘进军. 电力电子技术[M]. 北京: 机械工业出版社, 2000.
	WANG Z A , LIU J J . Power electronics[M]. Beijing: China Machine Press, 2000.
11	全国电压电流等级和频率标准化技术委员会.电能质量公用电网谐波: GB/T 14549-1993[S].北京: 中国标准出版社, 1993.
	National Technical Committee for Standard Voltages, Current Ratings and Frequencies.Quality of electric energy supply harmonics in public supply network: GB/T 14549-1993[S].Beijing: Standards Press of China, 1993.
12	龚静, 张巧杰. 有源电力滤波器半矢量预测控制策略研究[J]. 发电技术, 2019, 40 (5): 462- 468.
	GONG J , ZHANG Q J . Research on semi-vector predictive control strategy of active power filter[J]. Power Generation Technology, 2019, 40 (5): 462- 468.
13	孙锦, 方超, 曹亮. 变频器输入电抗器及直流滤波电容器的设计[J]. 应用科技, 2014, 41 (2): 16- 20.
	SUN J , FANG C , CAO L . Research on the design of input reactor and DC filer capacitor for frequency converter[J]. Applied Science and Technology, 2014, 41 (2): 16- 20.
14	袁国刚, 饶柱石. 基于振动分析法的变压器非电量状态监测与诊断研究[J]. 发电技术, 2019, 40 (2): 134- 140.
	YUAN G G , RAO Z S . Review of non-electrical quantity monitoring and fault diagnosis for power transformer on vibration analysis method[J]. Power Generation Technology, 2019, 40 (2): 134- 140.
15	李养俊, 何子春, 张强, 等. 火力发电厂电能质量测试与评估分析[J]. 发电技术, 2018, 39 (2): 135- 139.
	LI Y J , HE Z C , ZHANG Q , et al. Test and evaluation of power quality in thermal power plant[J]. Power Generation Technology, 2018, 39 (2): 135- 139.