Abstract
For the distribution area with a high penetration rate of new energy, the traditional power supply system has some problems, such as a single form of power supply and low utilization of new energy. Because the multi-port energy router can realize the interconnection and complementation of multiple energy forms, it has become the key piece of equipment in the hybrid AC/DC distribution area. Nevertheless, restricted by the existing control strategy, the performance of the energy router in complex operation mode switching and coordinated control still needs to be further improved. To address this issue, the free switching control strategy is proposed in this paper. Firstly, the topology and model of the multi-port energy router are designed and established. Secondly, the operation mode of the system is analyzed, and the control strategy of each port is designed. Then, a reference power calculation method suitable for multi-mode operation is derived. Based on this, the control strategy does not need to be changed when operation modes are switched. Furthermore, the extended state observer is introduced to track and compensate for the new energy disturbance, which can improve the power quality of the system. Finally, the simulation and experimental results show that the proposed control strategy of the multi-port energy router can realize flexible and controllable power transmission among various modules in the distribution area and the free switching of multi-operation modes without changing the control strategy.
Highlights
With the deepening of the low-carbon environmental protection concept, new energy sources, energy storages, DC charging piles of electric vehicles, and flexible loads are growing rapidly [1,2,3]
The simulation model of the proposed energy router (ER) system and control strategy is shown in Figure 8, which is established by MATLAB/Simulink
The virtual synchronous machine (VSM)-based free switching control strategy applied to the high-voltage side established according to Figure 7 is shown in Figure 8c, which includes P/f control, Q/v control, free switching control, and VSM control
Summary
With the deepening of the low-carbon environmental protection concept, new energy sources, energy storages, DC charging piles of electric vehicles, and flexible loads are growing rapidly [1,2,3]. It should be noted that the methods proposed in [22,23,24] only consider the grid-connected mode and island operation mode, which cannot meet the requirements of multi-port ER power flow in multiple directions. To realize the multi-operation modes of the multi-port ER and reduce the influence of mode switching on the system stability, a VSM-based free switching control strategy is proposed in this paper. Free switching between multi-operation modes can be realized without changing the control strategy, which reduces the complexity of control and improves the stability of the system. The simulation and experimental results show that the ER designed in this paper can operate stably in various modes, and the proposed VSM-based free switching control strategy can effectively improve the robustness of the system and achieve smooth switching between different operating modes. The distribution area can have superior power supply capacity and higher reliability
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