Reactive-Power Coordination in VSC-HVDC Multi-Terminal Systems for Transient Stability Improvement

Renedo, Javier; García-Cerrada, Aurelio; Rouco, L.

doi:10.1109/tpwrs.2016.2634088

Cited by 77 publications

(63 citation statements)

References 23 publications

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“…Previous power flow studies have been conducted on VSC-MTDC systems under the active power and reactive power decoupled control, which includes master-slave control and DC voltage droop control [18,20,23].…”

Section: Nodal Equivalent Methods Of Decoupled Controlmentioning

confidence: 99%

“…(1) A lot of publications have been focused on power flow studies on VSC-HVDC systems with symmetrical configurations [18,19]. However, there has been no prior work on power flow models and algorithms for the newly-developed VSC-MTDC with bipolar configuration considering the flexibility of the bipolar configuration, so that the individual power flows of the positive-pole and negative-pole DC networks can be implemented separately.…”

Section: Introductionmentioning

confidence: 99%

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Universal Power Flow Algorithm for Bipolar Multi-Terminal VSC-HVDC

Zhou

Zhang

et al. 2020

Energies

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An effective and accurate power flow algorithm provides control references for active power dispatch and initial steady state operating points, used for stability analysis, short-circuit calculations, and electromagnetic transient simulations, which is not only a fundamental precondition to analyze the system operating conditions, but also the basis to improve the accuracy of power flow and DC voltage control of the multi-terminal voltage source converter-based high voltage direct current (VSC-HVDC). This paper proposes a nodal voltage-based universal steady-state power flow algorithm for the newly-developed bipolar multi-terminal VSC-HVDC (VSC-MTDC). Firstly, as the positive-pole and negative-pole DC network of the bipolar VSC-MTDC can be operated individually, a bipolar power flow alternating iterative method is proposed here to obtain the positive/negative-pole DC network power flow. Secondly, a series of nodal equivalent methods involving various control strategies are proposed for the universal power flow algorithm. Then the detailed calculation procedure and a general MATLAB(TM) program for the universal power flow algorithm is presented. A typical 4-terminal bipolar VSC-MTDC system was built in the PSCAD/EMTDC to verify the validity of the proposed algorithm, and the results are discussed here. Moreover, the calculation results of more complex bipolar VSC-MTDC systems under different operating conditions, employing the proposed universal power flow algorithm, are presented to illustrate its universality and efficiency.

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Section: Nodal Equivalent Methods Of Decoupled Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Universal Power Flow Algorithm for Bipolar Multi-Terminal VSC-HVDC

Zhou

Zhang

et al. 2020

Energies

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“…As shown in Fig. 2, the reactive power frequency (Q-f) droop is adopted to share reactive power among WT converters and set the frequency reference  * [4,5,30,31]:…”

Section: E Offshore Frequency and Reactive Power Controlmentioning

confidence: 99%

Offshore AC Fault Protection of Diode Rectifier Unit-Based HVdc System for Wind Energy Transmission

2019

IEEE Trans. Ind. Electron.

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Offshore AC fault protection of wind turbines (WTs) connecting with diode rectifier unit based HVDC (DRU-HVDC) system is investigated in this paper. A voltage-error-dependent fault current injection is proposed to regulate the WT current during offshore AC fault transients and quickly provide fault current for fault detection. Considering different fault locations, the fault characteristics during symmetrical and asymmetrical faults are presented and the requirements for fault detection are addressed. A simple and effective offshore AC fault protection solution, combining both overcurrent protection and differential protection, is proposed by utilizing the developed fast fault current providing control. To improve system availability, reduced DC voltage of the DRU-HVDC system is investigated, where one of the series-connected DRUs is disconnected and the onshore modular multilevel converter (MMC) actively reduces DC voltage to resume wind power transmission. The proposed scheme is robust to various offshore AC faults and can automatically restore normal operation. Simulation results confirm the proposed fault protection strategy. Index Terms-diode rectifier unit based HVDC (DRU-HVDC), fault protection, HVDC transmission, offshore wind farm, symmetrical and asymmetrical AC faults.

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“…the thermal overload capacity of the conventional power generation surpasses the virtual synchronous generators based on the Voltage Source Converter (VSC) technologies [7], [8]. The 'real' synchronous machines do not depend on the limitations in overload capability of power electronic components.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Power Capability of Generator Units for Increased Operational Security Using NMPC

Øyvang

Nøland

Sharma

et al. 2020

IEEE Trans. Power Syst.

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The ever-increasing penetration of intermittent energy sources introduces new demanding operating regimes for the bulk power generation in the power grid. During a worstcase power system disturbance scenario, the generator needs to operate beyond its limits to maintain stable operation. Therefore, a new online low-order thermal model of a hydrogenerator has been recently proposed, where the periodic extension of the long-forgotten capability diagram of the machine was in-depth investigated. An increased performance can be obtained if the total thermal capacity of the generator is exploited by applying optimal control theory in the Automatic Voltage Regulator (AVR). This paper proposes a Non-linear Model Predictive Controller (NMPC) combined with an Unscented Kalman Filter (UKF) with a modeling framework geared for use in a supervisory control structure for the conventional control system. The method provides maximum utilization of the machine's thermal capacity by providing the controller with an Enhanced Capability Diagram (ECD). Case studies on a single-machine system and a 16-bus multi-machine system were investigated. The results show that a satisfying controller action during different long-term voltage instability scenarios is realized.

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Reactive-Power Coordination in VSC-HVDC Multi-Terminal Systems for Transient Stability Improvement

Cited by 77 publications

References 23 publications

Universal Power Flow Algorithm for Bipolar Multi-Terminal VSC-HVDC

Universal Power Flow Algorithm for Bipolar Multi-Terminal VSC-HVDC

Offshore AC Fault Protection of Diode Rectifier Unit-Based HVdc System for Wind Energy Transmission

Enhanced Power Capability of Generator Units for Increased Operational Security Using NMPC

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