A Dual Cooperative Optimization for Optimal Redundancy Quantity of MMC Submodules of Flexible Controller

doi:10.16183/j.cnki.jsjtu.2021.444

Abstract

Abstract:

The failure of modular multilevel converter (MMC) submodules in the flexible direct current (DC) system affects the normal operation of the system, and the mutual restriction of reliability and economy is one of the key issues of MMC redundancy configuration optimization. A multi-objective optimization function of MMC reliability and economy mathematical model with redundant submodules was established. Based on the weight coefficient and NSGAII multi-objective optimization methods, a dual collaborative optimization for redundancy quantity of flexible controller was proposed. Combining the advantages of the two methods, the intersection of the two optimization results was calculated under the same redundancy quantity selection preference. A model based on a DC project in a flexible station area of Nanjing was built in MATLAB. The simulation results prove that the proposed method can not only meet the reliability of the flexible DC system, but also significantly improve the economy. It provides ideas for redundancy quantity of MMC submodules in the actual flexible DC project.

Key words: modular multilevel converter (MMC), redundant submodule, NSGAII multi-objective optimization, weight coefficient, redundancy quantity optimization

CLC Number:

TM-9

MA Zhoujun, WANG Yong, WANG Jie, CHEN Shaoyu. A Dual Cooperative Optimization for Optimal Redundancy Quantity of MMC Submodules of Flexible Controller[J]. Journal of Shanghai Jiao Tong University, 2022, 56(3): 325-332.

Figures/Tables 6

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系统参数	取值
PCC额定电压	10 kV
交流侧等效电感(p.u.)	0.018
交流侧等效电阻(p.u.)	0.006
桥臂电感(p.u.)	0.0025
控制器额定容量	2 MV·A
PCC额定频率	50 Hz

N₀	R_MMC	E_MMC	C_MMC	满足约束	MOF
0	0.02585878	0	1.00	否	0.315515
1	0.43383842	0.34259043	0.95	否	0.579562
2	0.84775460	0.28712341	0.90	否	0.807365
3	0.97306173	0.22375505	0.85	是	0.861213
4	0.99616279	0.17918262	0.80	是	0.855616
5	0.99952667	0.14990391	0.75	是	0.839706
6	0.99994782	0.12998974	0.70	是	0.822968
7	0.99999476	0.11571327	0.65	是	0.806568
8	0.99999951	0.10499990	0.60	是	0.790500
9	0.99999996	0.09666665	0.55	否	0.774667
10	1.00000000	0.08999999	0.50	否	0.759000

N₀	满足约束	MOF
N₀	满足约束	(0.5,0.2, 0.3)	(0.6,0.1, 0.3)	(0.7,0.1, 0.2)	(0.8,0.1, 0.1)
0	否	0.3129290	0.315515	0.218101	0.120687
1	否	0.5704372	0.579562	0.527946	0.476330
2	否	0.7513019	0.807365	0.802141	0.796916
3	是	0.7862818	0.861213	0.873519	0.885825
4	是	0.7739179	0.855616	0.875232	0.894848
5	是	0.7547441	0.839706	0.864659	0.889612
6	是	0.7359718	0.822968	0.852962	0.882957
7	是	0.7181400	0.806568	0.841568	0.876567
8	是	0.7009997	0.790500	0.830500	0.870500
9	否	0.7293333	0.774667	0.819667	0.864667
10	否	0.7180000	0.759000	0.809000	0.859000