Multi-mode Coordinated Control Strategy for AC/DC Hybrid Microgrid

doi:10.12204/j.issn.1000-7229.2022.10.008

Abstract

Abstract:

A multi-mode coordinated control strategy is proposed for isolated AC/DC hybrid microgrid, which considers load state and the charge state of the energy storage subnet. In the state judgment level, the charged state of energy storage is divided into five modes, and the network operating conditions corresponding to the six power interaction states between subnets under each mode are planned in detail. The priority of energy storage subnets participating in power interaction among subnets changes with the state of charge. Power mutual-aid level controls the transmission power of bidirectional interlinking converters between subnets. At the local level, droop control is used to keep the subnet autonomous. This strategy can reduce unnecessary power interaction losses, and prevent the energy storage subnets from losing power regulation ability due to excessive charge and discharge in advance. Simulation models on the MATLAB/Simulink and RT-LAB verify the real-time effectiveness of the proposed control strategy.

Key words: AC/DC hybrid microgrid, coordinated control, state of charge, state switching

CLC Number:

TM713

LIN Peiyi, MI Yang, LI Haipeng, JIANG Enyu, SHI Shuai. Multi-mode Coordinated Control Strategy for AC/DC Hybrid Microgrid[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(10): 77-86.

Figures/Tables 21

Fig.1 Topology and hierarchical control diagram of AC/DC hybrid microgrid

Fig.2 State division of AC-DC subnet

Table 1 Judging basis of system states

Fig.3 Subnet power interaction mode division in model 1

Table 2 System power interaction states

Table 3 Judging criterion of interactive states

Table 4 Simulation parameters

Fig.4 Load and power interaction in Model 1

Fig.5 Control signal of state switching in Model 1

Fig.6 DC voltage and AC frequency in Model 1

Fig.7 Power interaction and SOC of energy storage subnet in Model 1

Fig.8 Load and power interaction in Model 3

Fig.9 Control signal of state switching in Model 3

Fig.10 DC voltage and AC frequency in Model 3

Fig.11 Power interaction and SOC of energy storage subnet in Model 3

Fig.12 Load and power interaction in Model 5

Fig.13 Control signal of state switching in Model 5

Fig.14 DC voltage and AC frequency in Model 5

Fig.15 Energy storage subnet power interaction and state of charge in Model 5

Table 5 Charging and discharging time comparison between this paper and the literature [14] s

Fig.16 Model 3 power interaction in RT-LAB

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