Droop Control Optimization for Multi-Terminal HVDC Transmission System

Thoen, Astrid; Svean, Magnus; Lebas, Olivier; Irnawan, Roni; Silva, Filipe Miguel Faria da

doi:10.1109/upec.2018.8541997

Cited by 2 publications

(5 citation statements)

References 5 publications

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“…Nevertheless, as verified in the first part of this paper, the droop curve of P-U DC is not strictly a linear line as usually assumed in the majority of previously published papers [1], [12]- [16]. When the VSC operates under conventional linear droop control scheme and its active power approaches the upper limit, the control error becomes significantly large.…”

Section: Introductionmentioning

confidence: 58%

“…With (12), once any of the estimated resistances at next time point differs from the initial values, the resistance variations with the ambient temperature or load currents are fed to the FSDC scheme. S is then immediately switched by the FSDC scheme to the position 1 and the real-time capturing of the droop characteristics P 6 -U 6 using fuzzy search starts.…”

Section: Periodical Update Of the Droop Curvementioning

confidence: 99%

“…It is also worth noticing that as discussed in Fig. 4, the droop curve can be significantly deviated from the predefined droop line by the VDC scheme, causing large active power control errors; therefore it is necessary to periodically update the droop curves according to the criteria as defined in (12) and (13) by the proposed FSDC scheme.…”

Section: B Comparison Of Step Dynamic Responsesmentioning

confidence: 99%

“…In efforts to address the abovementioned operational challenges, several studies have investigated numerous ways for controlling MTDC systems. For example, several active power and DC voltage (P-U DC ) droop control schemes were proposed for VSC based MTDC systems [12]- [14]. Commonly, the droop control scheme is implemented on top of the DC voltage regulator of individual VSCs and its purpose is to enable the DC voltage controlling VSC to regulate its active power output by offsetting its DC voltage.…”

Section: Introductionmentioning

confidence: 99%

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An Intelligent Implementation of Fuzzy Search Based Nonlinear Droop Control Scheme for Multi-Terminal DC Transmission Systems

Zhu

Liu

et al. 2019

IEEE Access

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Multi-Terminal DC (MTDC) transmission systems typically operate under active power and DC voltage (P-U DC) droop control for active power dispatch, and its design is greatly influenced by DC network characteristics. Hence, this paper firstly analyzes P-U DC droop characteristics when implemented on Grid-Side Voltage-Source Converters (GSVSCs) of a MTDC network, in which variations of DC cables' resistances with temperature are taken into account. The analysis establishes that the actual droop characteristics of GSVSCs are nonlinear, different from the widely assumption of linear relationships. This finding is the fundamental for the design of the accurate power dispatch for GSVSCs. Therefore, an improved Fuzzy Search based Droop Control (FSDC) scheme for MTDC systems is proposed, which performs real-time search to capture the accurate droop curves of GSVSCs over full range of permissible DC voltage and active power. The FSDC is implemented without the assumption of the prior knowledge of DC network parameters which are subject to variations and uncertainty, and instead the accurate droop curves are periodically obtained and updated. The technical viability of the FSDC and its superiority over the conventional linear droop scheme under the variations of DC cable resistances and power flow variations is verified by a four-terminal HVDC model established in MATLAB/Simulink. INDEX TERMS DC super grid, power dispatch, voltage-source converter, droop control, fuzzy search.

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Section: Introductionmentioning

confidence: 58%

Section: Periodical Update Of the Droop Curvementioning

confidence: 99%

Section: B Comparison Of Step Dynamic Responsesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Intelligent Implementation of Fuzzy Search Based Nonlinear Droop Control Scheme for Multi-Terminal DC Transmission Systems

Zhu

Liu

et al. 2019

IEEE Access

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“…Through this [22], the active power of HVDC is controlled by setting the values of the step capacity, step ramp, and droop control are discussed, which leads to different frequency nadir values during transient operation. Moreover, the droop optimization based on voltage value is discussed [23].…”

Section: Proposed Cooperation Concepts' Control Methodsmentioning

confidence: 99%

A Comprehensive Study of HVDC Link with Reserve Operation Control in a Multi-Infeed Direct Current Power System

et al. 2022

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The Korean government is targeting the development of a renewable energy penetration of 30–35% by 2040 of the total generation. These conditions will decrease network stability due to a lack of inertia, especially in isolated systems, such as Jeju Island. HVDC systems with several balancing arrangements of reserve operation are used to maintain variability and uncontrollability of RES penetration. This paper presents the fast frequency reserves of HVDC control systems for frequency stability enhancement in the isolated power system by using a combined frequency containment process with grid stability standards. A new MIDC reserve operation control with angle and voltage deviation at the bus converter was developed to provide a faster and more appropriate balancing arrangement compared to the other concept. In addition, two layers of energy and transfer-capacity flexibility were considered to prevent the need to hunt for that balancing arrangement, as well as low nadir frequency, unavailability of the reserve and other constraints caused by each region having a different network size, HVDC interconnection capacity, and type. The proposed control schemes were verified by simulations on the Korean power system model implemented in PSS/E for different sizes of disturbance.

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Droop Control Optimization for Multi-Terminal HVDC Transmission System

Cited by 2 publications

References 5 publications

An Intelligent Implementation of Fuzzy Search Based Nonlinear Droop Control Scheme for Multi-Terminal DC Transmission Systems

An Intelligent Implementation of Fuzzy Search Based Nonlinear Droop Control Scheme for Multi-Terminal DC Transmission Systems

A Comprehensive Study of HVDC Link with Reserve Operation Control in a Multi-Infeed Direct Current Power System

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