DC Grid Control Through the Pilot Voltage Droop Concept—Methodology for Establishing Droop Constants

Berggren, Bertil; Lindén, Kerstin; Majumder, Ritwik

doi:10.1109/tpwrs.2014.2360585

Cited by 55 publications

(52 citation statements)

References 5 publications

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“…For the sake of completeness, it should be mentioned that in the literature, examples are found of using the square of the dc-side voltage for constant voltage control [27] or for droop control [28]. As an alternative to using a local voltage signal, in [29] it has been suggested to use a common (voltage) feedback signal for all converters instead of the local voltage values, thereby altering the power sharing by using communication.…”

Section: General Droop Control Definitionmentioning

confidence: 99%

A comprehensive modeling framework for dynamic and steady-state analysis of voltage droop control strategies in HVDC grids

Beerten

Belmans

2015

International Journal of Electrical Power & Energy Systems

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a b s t r a c tThis paper presents a comprehensive modeling framework to analyze and compare the performance of different voltage droop control characteristics in an HVDC grid. All models are fully derived mathematically, both for dynamic simulations and for steady-state power flow analysis. The main contribution lies in the development of a common modeling and control approach for the different droop-based control schemes that have been presented in the literature. The discussion includes power-and current-based droop control, either in their standard form or combined with a deadband, a constant voltage control or consisting of different slopes. Dynamic simulations show that, when applying a comparable underlying dynamic converter control framework, similar dynamic responses can be expected from the different droop control schemes, while the steady-state voltage deviations and power sharing after a contingency are different. A comparison with results from a full-detailed power flow implementation shows that these voltage deviations and power sharing can accurately be predicted by the derived steady-state power flow models, thereby avoiding the need for time-consuming dynamic simulations.

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Section: General Droop Control Definitionmentioning

confidence: 99%

A comprehensive modeling framework for dynamic and steady-state analysis of voltage droop control strategies in HVDC grids

Beerten

Belmans

2015

International Journal of Electrical Power & Energy Systems

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“…HANKS to its fast development, the high-voltage directcurrent (HVDC) grid technology has been recognized as an effective solution for renewable energy grid connection and consumption [1]- [3]. The HVDC grid is the next logical step of the HVDC network which does not have the redundant operation capability.…”

Section: Introductionmentioning

confidence: 99%

“…The current flow can be calculated by(3), where u1, u2, u3, u4 are the DC terminal voltages of the four converters, P1, P3, and P4 are the power output from converters 1, 3, and 4 to the DC-side, R12, R13, R34 and R24 are the resistances of lines 1,2,3,4; i12, i13, i34 and i24 are the currents of lines 1,2,3,4.…”

mentioning

confidence: 99%

DC Current Flow Controller With Fault Current Limiting and Interrupting Capabilities

et al. 2021

IEEE Trans. Power Delivery

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Conventionally, the current flow control and DC fault protection issues of HVDC grids are supposed to be solved by the DC current flow controller (CFC) and DC circuit breaker (DCCB) separately, which may result in a high capital cost. This paper proposes a CFC topology with DC fault current limiting and interrupting capabilities. The topology and operating principle of the CFC are presented with theoretical analysis. The control strategies under normal and fault conditions are described. In order to reduce the use of IGBTs, an H-bridge inter-line CFC with fault current limiting capability is further proposed based on the proposed CFC. The proposed CFCs are tested in PSCAD/EMTDC. Simulation results show that the proposed two CFCs can effectively control the current flow of two lines during normal operation and limit and interrupt DC fault currents.

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“…The ADC is used for frequency regulation and power sharing [27] and it is also used for effective power-sharing and DC voltage control [28] in MTDC grids. In [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] except in [17], offshore or onshore WF has been considered as constant power injection sources and no support was taken from WF during converter outage or huge power imbalances. In [17], during no-load operation, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…This attempt is made in this study. The proposed control strategies take the support from the WFs during converter outages or faults or huge power imbalances unlike in [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. The main contribution of the study is as follows in comparison with existing ADC control methods for improving the DC voltage deviation, and power-sharing controls are…”

Section: Introductionmentioning

confidence: 99%

Adaptive droop control strategy for autonomous power sharing and DC voltage control in wind farm‐MTDC grids

Kumar

Padhy

2019

IET Renewable Power Generation

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This study presents a novel adaptive droop control (ADC) strategy for power-sharing in a multi-terminal high-voltage DC grid while maintaining a desirable DC voltage level. The ADC scheme can share the power without burdening any power converters during one or more converter outages and huge power imbalance situations. To improve the effectiveness of the power sharing and DC voltage deviation control, the ADC is also implemented for wind farm converters. This is achieved through a derated mode operation of wind farms. The performance and effectiveness of the proposed control approach are evaluated in several case studies based on the specific type of converter outage under the various outage scenarios. The proposed method is validated on a five-terminal CIGRE B4 DC grid test system.

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DC Grid Control Through the Pilot Voltage Droop Concept—Methodology for Establishing Droop Constants

Cited by 55 publications

References 5 publications

A comprehensive modeling framework for dynamic and steady-state analysis of voltage droop control strategies in HVDC grids

A comprehensive modeling framework for dynamic and steady-state analysis of voltage droop control strategies in HVDC grids

DC Current Flow Controller With Fault Current Limiting and Interrupting Capabilities

Adaptive droop control strategy for autonomous power sharing and DC voltage control in wind farm‐MTDC grids

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