Hierarchical Optimization Control Strategy for Microgrid Based on PD Consensus Algorithm

doi:10.11985/2023.02.017

Abstract

Abstract:

Due to the microgrid loses the support of the large power grid when it is operating in an island, the stability of the system voltage and frequency is difficult to be guaranteed, and ensuring that the frequency and voltage of the system are maintained at a stable value is the prerequisite and basis for the stable operation of the microgrid. In view of the fact that the traditional droop control is likely to cause deviations in the frequency and voltage of the system, a state observer based on the PD control consistency algorithm is introduced in the secondary layer of the microgrid to dynamically compensate the deviation. The third layer aims to achieve the optimal economic operation of distributed power sources. The consensus algorithm theory of PD control is used to solve the optimal incremental rate and power value of distributed power sources. Compared with the basic consensus algorithm, the convergence time is effectively shortened. To further solve the optimal power value considering the limited conditions of distributed power generation, the stability simulation of the system is carried out for the load and power fluctuation factors in the end. Experiments are conducted to verify the effectiveness of the control strategy.

Key words: Microgrid, hierarchical optimization, droop control, consistency algorithm, economic operation

CLC Number:

TM73

CHEN Jie, LONG Yingwen. Hierarchical Optimization Control Strategy for Microgrid Based on PD Consensus Algorithm[J]. Journal of Electrical Engineering, 2023, 18(2): 174-182.

Figures/Tables 10

References 16

[1]	薛慧杰, 朱天璋, 田启川. 直流微电网独立与并网模式无缝切换控制策略[J]. 电源学报, 2020, 18(6):77-85. doi: 10.13234/j.issn.2095-2805.2020.6.77
	XUE Huijie, ZHU Tianzhang, TIAN Qichuan. Control strategy of seamless switching between stand-alone and grid-connected modes of DC microgrid[J]. Journal of Power Supply, 2020, 18(6):77-85. doi: 10.13234/j.issn.2095-2805.2020.6.77
[2]	茆美琴, 丁勇, 胡健, 等. 含多光储VSG单元孤岛微网参数自适应功率协调与频率优化控制[J]. 电源学报, 2020, 18(6):20-32. doi: 10.13234/j.issn.2095-2805.2020.6.20
	MAO Meiqin, DING Yong, HU Jian, et al. Parameter adaptive power coordination and frequency optimization of islanded microgrid with PV/battery VSG units[J]. Journal of Power Supply, 2020, 18(6):20-32. doi: 10.13234/j.issn.2095-2805.2020.6.20
[3]	施天灵, 汪飞, 张圣祺, 等. 直流船舶综合电力系统中混合储能的精确功率分配策略研究[J]. 电源学报, 2020, 18(6):12-19. doi: 10.13234/j.issn.2095-2805.2020.6.12
	SHI Tianling, WANG Fei, ZHANG Shengqi, et al. Research on accurate power distribution strategy for hybrid energy storage in DC shipboard integrated power system[J]. Journal of Power Supply, 2020, 18(6):12-19. doi: 10.13234/j.issn.2095-2805.2020.6.12
[4]	LIU Yancheng, ZHUANG Xuzhou, ZHANG Qinjin, et al. A novel droop control method based on virtual frequency in DC microgrid[J]. International Journal of Electrical Power and Energy Systems, 2020:119.
[5]	朱鹏, 闫天一. 基于一致性改进下垂控制的微电网频率研究[J]. 电气自动化, 2020, 42(4):28-30.
	ZHU Peng, YAN Tianyi. Research on micro-grid frequency under consistency-based improved droop control[J]. Electrical Automation, 2020, 42(4):28-30.
[6]	黄阮明, 王海群, 张铭泽, 等. 计及负荷电压静态特性的光储微电网频率控制策略[J]. 分布式能源, 2020, 5(6):1-6.
	HUANG Ruanming, WANG Haiqun, ZHANG Mingze, et al. Frequency control strategy of photovoltaic storage microgrid considering static load voltage characteristics[J]. Distributed Energy, 2020, 5(6):1-6.
[7]	于会群, 张晓丹, 李增峰, 等. 基于电能质量等级的孤岛微电网分层控制策略[J]. 电力科学与技术学报, 2020, 35(6):68-75.
	YU Huiqun, ZHANG Xiaodan, LI Zengfeng, et al. Research on hierarchical control strategy of island micro grid based on power quality grades[J]. Journal of Electric Power Science and Technology, 2020, 35(6):68-75.
[8]	赵晶晶, 屈靖雅. 基于源荷协调控制的微电网一次调频模型[J]. 水电能源科学, 2020, 38(11):195-198,177.
	ZHAO Jingjing, QU Jingya. Microgrid primary frequency control model considering source-load coordination control[J]. Water Resources and Power, 2020, 38(11):195-198,177.
[9]	PARHIZI S, KHODAEI A, SHAHIDEHPOUR M. Market-based versus price-based microgrid optimal scheduling[J]. IEEE Transactions on Smart Grid, 2018, 9(2):615-623. doi: 10.1109/TSG.2016.2558517
[10]	米阳, 李战强, 吴彦伟, 等. 基于两级需求响应的并网微电网双层优化调度[J]. 电网技术, 2018, 42(6):1899-1906.
	MI Yang, LI Zhanqiang, WU Yanwei, et al. Bi-layer optimal dispatch of grid connected microgrid based on two-stage demand response[J]. Power System Technology, 2018, 42(6):1899-1906.
[11]	HAN Y, ZHANG K, LI H, et al. MAS-based distributed coordinated control and optimization in microgrid and microgrid clusters:A comprehensive overview[J]. IEEE Transactions on Power Electronics, 2018, 33(8):6488-6508. doi: 10.1109/TPEL.2017.2761438
[12]	蒋科, 吴峰, 张新松, 等. 基于有限步一致性算法的交直流混联微电网分布式动态经济调度[J]. 南通大学学报, 2020, 19(1):17-25.
	JIANG Ke, WU Feng, ZHANG Xinsong, et al. Dynamic economic dispatch of AC/DC microgrid based on the finite-step consensus algorithm[J]. Journal of Nantong University, 2020, 19(1):17-25.
[13]	HUANG Huanyang, SHI Ming, XU Qi. Consensus-based economic dispatch algorithm in a microgrid via distributed event-triggered control[J]. International Journal of Systems Science, 2020, 51(15):3044-3054. doi: 10.1080/00207721.2020.1808110
[14]	BAI L, YE M J, SUN C, et al. Distributed economic dis-patch control via saddle point dynamics and consensus algorithms[J]. IEEE Transactions on Control Systems Technology, 2019, 27(2):898-905. doi: 10.1109/TCST.2017.2776222
[15]	LÜ Zhenyu, WU Zaijun, DOU Xiaobo, et al. Distributed economic dispatch scheme for droop-based autonomous DC microgrid[J]. Energies, 2020, 13(2):404. doi: 10.3390/en13020404
[16]	吕朋蓬, 赵晋泉, 苏大威, 等. 基于一致性理论的独立微电网分布式动态经济调度[J]. 电力系统自动化, 2019, 43(5):22-44.
	LÜ Pengpeng, ZHAO Jinquan, SU Dawei, et al. Consensus-based distributed dynamic economic dispatching for islanded microgrids[J]. Automation of Electric Power Systems, 2019, 43(5):22-44.

DG	a_i	b_i	c_i	P_i_,max
DG₁	0.032	0.828	21.68	30
DG₂	0.053	1.442	52.54	25
DG₃	0.062	1.086	38.15	25
DG₄	0.093	1.854	37.74	20