Abstract
This paper focuses on the instability problem of the medium-voltage DC (MVDC) distribution system and proposes an impedance phase reshaping (IPR) method. To obtain the load impedance model of the MVDC distribution system, the input impedance of the input-series-output-parallel (ISOP) DC transformer (DCT) is derived by the generalized average modeling (GAM). Based on the obtained model, the traditional ISOP DCT controller optimization (IDCO) approach is discussed and the IPR method is developed. An impedance phase controller is introduced based on the original control method. According to the optimized impedance stability criterion, the parameters of the impedance phase controller are determined. Compared with the IDCO approach, the proposed method weakens the negative resistance characteristic of the load impedance at the resonant frequency. Therefore, the MV bus voltage oscillation is rapidly mitigated. Besides, the dynamic performance of the system using the IPR method can be classified as good. The simulation results show that the mathematical model is correct, and the proposed method is effective for the rapid stabilization of MVDC distribution systems.
Highlights
The medium-voltage DC (MVDC) distribution system has become the trend of the future energy internet power distribution due to the beneficial attributes, such as its flexibility and efficiency [1–3]
An MVDC grid was designed for the interconnection of high-power test benches at a university campus [4]
The MVDC power distribution has been widely applied in railway electrification systems and marine electrical distribution systems [5–10]
Summary
The medium-voltage DC (MVDC) distribution system has become the trend of the future energy internet power distribution due to the beneficial attributes, such as its flexibility and efficiency [1–3]. The DC transformer (DCT) plays a prominent role in the modern MVDC distribution system. It connects the MVDC bus and the low-voltage DC (LVDC) bus. Given the voltage stress of the switching devices, the inputs-series-output-parallel (ISOP) topology of several DC/DC converter modules has been introduced. An input voltage sharing (IVS) control strategy has been presented to ensure the power sharing of the ISOP DCT [13,14]. When a regulated ISOP DCT is connected to a power electronic converter or an inductive circuit as shown, the stability of the MVDC distribution system When a regulated ISOP DCT is connected to a power electronic converter or an inductive circuit as shown in Figure 1, the stability of the MVDC distribution system
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