Abstract
A DC power flow controller (DCPFC) can help to facilitate power flow routing in the multi-terminal high-voltage direct current (HVDC) transmission system. Realizing its multi-port output can effectively improve the device regulate range and capability. Based on analysis of the traditional multi-port interline DC power flow controller (MI-DCPFC), this paper presents a switches reduced topology of MI-DCPFC. In addition, for solving the problem of coupling of the port-output voltage of the traditional MI-DCPFC, a novel control strategy based on carrier phase shifting pulse width modulation (CPS-PWM) is proposed. It implements the decoupling of the port-output voltage of MI-DCPFC, which can ensure completely independent tracking of the power flow regulating commands for different controlled lines. Moreover, key relationships between the system state variables are also analyzed and detailed in this study. Finally, the performance of the proposed controller and control strategy are confirmed with the simulation and experiment studies under different conditions.
Highlights
Realizing the development and utilization of green and clean energy has become a major trend to solve problems such as traditional energy shortages and environmental degradation
In order to facilitate the power flow management inside the DC transmission network, inspired by the idea of power flow control devices developed in the AC transmission system, such as a unified power-flow controller (UPFC) and thyristor controlled series compensator (TCSC), a DC power flow controller (DCPFC) can be introduced in the multi-terminal
The dc power flow control issue in multi-terminal high-voltage direct current (HVDC) transmission system was investigated in this paper
Summary
Realizing the development and utilization of green and clean energy has become a major trend to solve problems such as traditional energy shortages and environmental degradation. To ensure the consumption and efficient use of the large scale new energy, effective transmission technology is needed as a support [1]. As the multi-terminal high-voltage direct current (HVDC) transmission system has the advantages of long transmission distance capability, large capacity and a flexible operation mode, etc., it has become one of the main means to facilitate grid connections of large-scale renewable energy [2]. In order to facilitate the power flow management inside the DC transmission network, inspired by the idea of power flow control devices developed in the AC transmission system, such as a unified power-flow controller (UPFC) and thyristor controlled series compensator (TCSC), a DC power flow controller (DCPFC) can be introduced in the multi-terminal. Since the DC system does not have reactive power, reactance and phase angle, its power flow control can only be realized by adjusting the resistance or DC voltage
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