Control scheme for multi‐terminal VSC‐based medium‐voltage DC distribution networks

Ji, Yirun; Yuan, Zhaohui; Zhao, Jianfeng; Zhao, Yuming; Li, Guoxiang; Li, Yan

doi:10.1049/joe.2018.8479

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…The authors in [3] studied the mechanism of high-frequency oscillations (HFOs) of flexible DC distribution systems based on droop control in the time domain and established a reduced-order mathematical model. For the stability control of DC distribution systems, the authors in [4] studied the response characteristics of the droop control system under a high-penetration rate of renewable energy and frequent switching of operation modes and proposed a system fault isolation and recovery strategy under a DC pole-to-pole fault. Although the stability has been improved, the stability of the system is still not guaranteed, and the disadvantages of weak sag damping control still exist.…”

Section: Introductionmentioning

confidence: 99%

A Virtual Inertia Method for Stability Control of DC Distribution Systems with Parallel Converters

et al. 2022

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DC distribution systems are a typical power electronic system with low inertia, low-rotational kinetic energy, and poor antidisturbance capability when loads fluctuate or parameters change. In this paper, a virtual inertia control with an additional first-order filtering link is proposed on the basis of P-Udc droop control. The results of the simulations and experiments verify that the additional inertia control reduces the voltage change rate and improves the system inertia by adjusting the virtual capacitance value on the DC side of the converter, which can achieve a smoother and more accurate voltage control and suppress the continuous voltage oscillation.

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Section: Introductionmentioning

confidence: 99%

A Virtual Inertia Method for Stability Control of DC Distribution Systems with Parallel Converters

et al. 2022

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“…photovoltaics and fuel cells), medium voltage DC (MVDC) distribution networks have been widely considered and show promising advantages in their efficiency and flexibility [1][2][3]. Voltage source converter (VSC) based MVDC is probably the most popular topology in MVDC distribution systems due to its features such as larger capacity, less complexity, and higher efficiency [4][5][6]. Figure 1 illustrates a typical VSC-based multi-terminal MVDC distribution network with multiple DC feeders, each of which could integrate a number of VSC-based AC sources and local loads.…”

Section: Introductionmentioning

confidence: 99%

An effective fault management scheme and comprehensive double line‐frequency ripple propagation analysis for MVDC networks

Sun

Liu

et al. 2021

IET Generation Trans & Dist

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This paper proposes an effective fault management scheme for medium-voltage direct current (MVDC) networks, which includes a virtual-impedance-based fault current limiter (VI-FCL) on the DC side and a positive-negative-sequence (PNS) control scheme on the AC side. Depending on the fault current value, different protection strategies are adopted, which include either isolating the fault by opening circuit breakers or riding through the fault with the proposed VI-FCL. It is known that unbalanced grid voltage can be found in conventional AC distribution feeders due to unbalanced loading conditions among three phases. The unbalanced grid voltage could induce double line-frequency (2 ) ripples on both DC voltage and current, which could thereby trigger protection malfunction in the DC sub-sections. Therefore, the PNS control scheme is used to eliminate the 2 ripples of both DC voltages and currents caused by unbalanced AC voltages. Furthermore, a detailed 2 mathematical model of the MVDC network under unbalanced AC voltage condition is derived to investigate how the 2 ripple propagates across the network. A voltage source converter based multi-terminal MVDC network is built to test DC faults with different fault currents, unbalanced AC voltages, and different control schemes. The test results verify both the proposed fault management scheme and the 2 ripple propagation analysis.

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“…However, the DC voltage control and active power balance tasks are inherently opposing each other. In this way, DC voltage regulation causes a steady-state error in active power and vice versa [17][18][19]. Various centralized and decentralized primary level control schemes for multiterminal MVDC distribution network were reviewed in [19] and the DC voltage control with dead-band demonstrated higher flexibility than the conventional droop control.…”

Section: Introductionmentioning

confidence: 99%

“…The MVDC distribution network is conceived as a collection platform that can provide an additional layer of infrastructure between transmission and distribution to help integrate RE power generation like wind and solar PV, energy storage and various emerging end-user loads as well as serve future electrical power conversion needs in a more optimized way [2,28,29]. However, research in the MVDC distribution network is still in theoretical and exploratory stages [17]. Thus, several pioneer studies on MVDC network like [5] focused on designing and primary control of an MVDC substation model with wind power and AC loads.…”

Section: Introductionmentioning

confidence: 99%

“…A similar study was undertaken in [7] on a multiterminal MVDC system integrating battery energy storage. In [17], investigations on the primary control scheme of a multiterminal MVDC distribution network demonstration project were done. Further research on the project at the hierarchical level was done in [16] whereby the breadth-first search algorithm at the secondary control level was created to automatically identify the topology of the system and adjust the control mode of the converters.…”

Section: Introductionmentioning

confidence: 99%

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Multiterminal Medium Voltage DC Distribution Network Hierarchical Control

et al. 2020

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In this research study, a multiterminal voltage source converter (VSC) medium voltage DC (MVDC) distribution network hierarchical control scheme is proposed for renewable energy (RE) integration in a co-simulation environment of MATLAB and PSCAD/EMTDC. A DC optimal power flow (DC OPF) secondary controller is created in MATLAB. In PSCAD/EMTDC, the main circuit containing the adaptive DC voltage droop with a dead band and virtual synchronous generator (VSG) based primary controller for the VSCs is implemented. The simulation of the MVDC network under the proposed hierarchical control scheme is investigated considering variations in wind and solar photovoltaic (PV) power. The network is also connected to the standard IEEE-39 bus system and the hierarchical scheme tested by assessing the effect of tripping as well as restoration of the REs. The results show that during random variations in active power such as increasing wind and PV power generation, a sudden reduction or tripping of wind and PV power, the primary controller ensures accurate active power sharing amongst the droop-based VSCs as well as regulates DC voltage deviations within the set range of 0.98–1.02 pu with an enhanced dynamic response. The DC OPF secondary control optimizes the system’s losses by 38% regularly giving optimal droop settings to the primary controllers to ensure proper active power balance and DC voltage stability. This study demonstrates that the hierarchical control strategy is effective for RE integration in the MVDC distribution network.

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Control scheme for multi‐terminal VSC‐based medium‐voltage DC distribution networks

Cited by 9 publications

References 16 publications

A Virtual Inertia Method for Stability Control of DC Distribution Systems with Parallel Converters

A Virtual Inertia Method for Stability Control of DC Distribution Systems with Parallel Converters

An effective fault management scheme and comprehensive double line‐frequency ripple propagation analysis for MVDC networks

Multiterminal Medium Voltage DC Distribution Network Hierarchical Control

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