Adjustable Inertial Response From the Converter With Adaptive Droop Control in DC Grids

Wáng, Yì; Wang, Chen; Xu, Lie; Meng, Jianhui; Hei, Yang

doi:10.1109/tsg.2018.2820160

Cited by 61 publications

(31 citation statements)

References 26 publications

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“…According to (13), the DC bus voltage variation rate is inversely proportional to C v . Thus, with the larger virtual capacitance and the smoother DC bus voltage, the voltage response characteristics will be much better when confronted with power fluctuations.…”

Section: Actual Operational Requirements and Realisability Constraintsmentioning

confidence: 99%

“…In fact, the inertia control of a DC system can be realised both in grid-connected mode and the islanding mode, but the virtual inertia coefficient is short of flexibility. As a decentralised control scheme widely used in DC systems, droop control is adopted adaptively and flexibly to emulate system inertia [13][14][15]. In [16,17], the inertial control of the energy storage terminal is analysed and the traditional droop control is improved, but actual constraints of the converter are ignored.…”

Section: Introductionmentioning

confidence: 99%

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Flexible virtual capacitance control strategy for a DC microgrid with multiple constraints

Meng

Zhang

Wáng

et al. 2020

IET Renewable Power Generation

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In a DC microgrid, the anti-interference ability of bus voltage can easily become vulnerable due to low inertia caused by a large number of power electronic converters. This has already challenged the system stability and practicability in DC girds. In this study, a flexible virtual capacitance (FVC) control strategy with multiple constraints (MCs) is proposed to guarantee the security and stability of the DC microgrid, where the system stability, dynamic characteristics, actual operation requirements and realisability are considered as MCs. The FVC controller, which mainly modifies the reference current in voltage source converter by flexibly regulating virtual capacitance value, is given to provide inertial support and improve voltage quality. The stable operating boundary calculation based on small signal model and key control parameters design are further introduced into the control loop. This can ameliorate the dynamic response of the microgrid and obtain the better engineering practicability. Finally, experiment tests on a controller-level hardware-in-the-loop simulation platform are carried out to verify the validity of the proposed strategy.

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Section: Actual Operational Requirements and Realisability Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexible virtual capacitance control strategy for a DC microgrid with multiple constraints

Meng

Zhang

Wáng

et al. 2020

IET Renewable Power Generation

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is characterised by simplified system-level control and easy expansion. Related control algorithms include hierarchical droop control [9], droop control based on voltage change rate [10], virtual inertial control [11][12][13], adaptive frequency division method [14] and so on. Meng et al [15] divide the working interval according to the voltage range of the bus, determine the working state of energy storage according to the voltage interval, and use different droop coefficients to achieve power distribution.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the ship's HESS, the energy‐type energy storage has a limited capacity and cannot output power for a long time unlike other scenes. Based on the virtual inertia theory, Wang et al [10] can adaptively adjust the droop coefficient according to the change rate of the DC voltage

U^{'}

. However, this method is only for a single type of energy storage, and the issue of HESS power allocation is not discussed.…”

Section: Introductionmentioning

confidence: 99%

Decentralised power distribution and SOC management algorithm for the hybrid energy storage of shipboard integrated power system

Lin

Xiao

2020

IET gener. transm. distrib.

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In the medium voltage direct current (MVDC) shipboard grid, the inherent inertial support from the DC capacitors is too small to resist step changes or fluctuations from the high power pulse load and propulsion load, which results in lower DC voltage quality. This study proposes a decentralised control algorithm for the MVDC shipboard hybrid energy storage system (HESS) to enhance the onboard survivability. This algorithm adjusts the droop control coefficient based on the bus voltage change rate adaptively, meanwhile the voltage differential signal processing and filtering are implemented by the trace differentiator. In addition, the proposed algorithm also has state-of-charge (SOC) balancing and SOC recovery abilities between multiple groups of energy storage devices. The parameter selection principle are analysed, and a variety of working conditions are simulated and verified in PSCAD. Theoretical analysis and simulation show that, HESS can achieve good power distribution and SOC management performance without communication compared to fixed droop coefficient control strategies, and the dynamic characteristics of bus voltage have been significantly improved.

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“…Benefiting from its straight forward control characteristics, droop control does not depend on communication between inverters, and is thus a promising method for large power system [7]- [9]. There are increasing research of droop control application on both alternating current (a.c.) and direct current (d.c.) grids in recent years [10]- [13].…”

Section: Introductionmentioning

confidence: 99%

PQ-Coupling Strategy for Droop Control in Grid-Connected Capacitive-Coupled Inverter

et al. 2019

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Droop control has been a well-known technique for power-sharing control of the grid-connected inverters. However, droop control with special strategy is required for capacitive-coupled inverters (CCIs) since the large coupling capacitance in CCI and decoupled nature in droop control massively narrow the controllable power range of droop control and makes the application impractical. So far, less work is done on the topic, and in this paper, the phenomenon of narrowed controllable power range in droop control is investigated, and a solution is proposed by introducing a novel active-reactive power (PQ)-coupling strategy. The proposed control is being tested on a laboratory CCI prototype. The simulation results and experimental verifications are presented to show the feasibility and validity of the proposed coupling droop control strategy. INDEX TERMS Droop control, capacitive coupled, grid-connected converter, power flow model, PQ accuracy.

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Adjustable Inertial Response From the Converter With Adaptive Droop Control in DC Grids

Cited by 61 publications

References 26 publications

Flexible virtual capacitance control strategy for a DC microgrid with multiple constraints

Flexible virtual capacitance control strategy for a DC microgrid with multiple constraints

Decentralised power distribution and SOC management algorithm for the hybrid energy storage of shipboard integrated power system

PQ-Coupling Strategy for Droop Control in Grid-Connected Capacitive-Coupled Inverter

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