Investigate on a Simplified Multi-Port Interline DC Power Flow Controller and Its Control Strategy

Zhang, Peiying; Wu, Xuezhi; Long, Jing; Yin, Jingyuan

doi:10.3390/en12132480

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…The following work actually can be applied to any VSC-MTDC transmission system. For this study, a typical fiveterminal VSC-MTDC transmission system [25] is adopted as an example to carry out the related analysis.…”

Section: B Connection To the Mtdcmentioning

confidence: 99%

“…In addition, it cannot directly track the line current commands for power flow control, which adversely affects the control accuracy of the device. In [24], an inter-line M-DCPFC topology based on the insulated gate bipolar transistor (IGBT) half-bridge module is proposed, and its simplified topology is developed in [25], as shown in Figure 2(b). T and P are the terminals of the inter-line M-DCPFC, which are used for connecting the transmission lines.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the previous work in [25], by introducing a partial power rated auxiliary DC/DC converter unit, an improved M-DCPFC is proposed in this paper. It solves the coupling issue between the line current and the capacitor voltage of the previous inter-line M-DCPFC, which makes the M-DCPFC have higher adjustment flexibility and can realize the power flow reverse control.…”

Section: Introductionmentioning

confidence: 99%

“…Topologies of the traditional M-DCPFC: (a) traditional M-DCPFC topology proposed in[23]; (b) previous inter-line M-DCPFC topology proposed in[25].…”

mentioning

confidence: 99%

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An Improved Multiport DC Power Flow Controller for VSC-MTDC Grids

Zhang

Zhao

et al. 2020

IEEE Access

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As a key device to facilitate power flow in the multi-terminal direct current (MTDC) transmission system, DC power flow controller (DCPFC) can effectively expand the power flow regulation area by implementing its multiport output functionality. In order to solve the coupling issue between the transmission line current and the capacitor voltage of the inter-line multiport DCPFC (M-DCPFC), an improved M-DCPFC with a partial power rated auxiliary DC/DC converter unit is proposed in this paper. It provides the advantages of power flow reversal, high adjustment flexibility and low port-expansion cost. Meanwhile, a generic control strategy is developed for the M-DCPFC with random number of the ports. Moreover, from the perspective of the transmission system, the proposed M-DCPFC is modeled as the equivalent series voltage source. Its power flow adjustment capability and its impact on the local voltage source converter (VSC) stations are investigated in detail in this paper. Lastly, to validate the effectiveness of the proposed M-DCPFC, it is first tested in the simulations of the MATLAB/Simulink and then deployed on an experiment platform. Both simulation and experimental results show that the proposed M-DCPFC can achieve stable power flow control in different conditions. INDEX TERMS Multi-terminal direct current transmission system, DC power flow controller, multiport, power flow adjustment capability.

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Section: B Connection To the Mtdcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Topologies of the traditional M-DCPFC: (a) traditional M-DCPFC topology proposed in[23]; (b) previous inter-line M-DCPFC topology proposed in[25].…”

mentioning

confidence: 99%

See 2 more Smart Citations

An Improved Multiport DC Power Flow Controller for VSC-MTDC Grids

Zhang

Zhao

et al. 2020

IEEE Access

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“…Concerning the DCPFC control strategy, the bulk of previously published articles [13][14][15] have established control strategies for their proposed DCPFC topologies; however, they are all standard linear control strategies based on the proportional-integral (PI) control technique. Using the PI control methodology, reference [16] developed and analyzes the mathematical model of a threeterminal DC grid with a DCPFC placed between two lines.…”

Section: Introductionmentioning

confidence: 99%

Model Predictive Control Strategy of Multi-Port Interline DC Power Flow Controller

Wang,

Xu,

Shen

et al. 2023

Energy Engineering

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There are issues with flexible DC transmission system such as a lack of control freedom over power flow. In order to tackle these issues, a DC power flow controller (DCPFC) is incorporated into a multi-terminal, flexible DC power grid. In recent years, a multi-port DC power flow controller based on a modular multi-level converter has become a focal point of research due to its simple structure and robust scalability. This work proposes a model predictive control (MPC) strategy for multi-port interline DC power flow controllers in order to improve their steady-state dynamic performance. Initially, the mathematical model of a multi-terminal DC power grid with a multi-port interline DC power flow controller is developed, and the relationship between each regulated variable and control variable is determined; The power flow controller is then discretized, and the cost function and weight factor are built with numerous control objectives. Sub module sorting method and nearest level approximation modulation regulate the power flow controller; Lastly, the MATLAB/Simulink simulation platform is used to verify the correctness of the established mathematical model and the control performance of the suggested MPC strategy. Finally, it is demonstrated that the control strategy possesses the benefits of robust dynamic performance, multiobjective control, and a simple structure.

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