Coordinated Voltage and Frequency Control in Hybrid AC/MT-HVDC Power Grids for Stability Improvement

Gu, Mingchen; Meegahapola, Lasantha; Wong, K. L.

doi:10.1109/tpwrs.2020.2983431

Cited by 34 publications

(25 citation statements)

References 24 publications

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“…If the improved analytical model is adopted, the power variations of VSC2, VSC3, and VSC4 obtained by Equation ( 27) are 48.65 MW, 20.48 MW, and −30.73 MW respectively. Perform simulation according to the results of Equation (27), and the simulation results are shown in Figure 6. The power variation of VSC1 is only 0.15 MW, indicating that VSC1 is basically unaffected.…”

Section: Validation Of the Improved Analytical Modelmentioning

confidence: 99%

Joint primary frequency regulation strategy for asynchronous power grids connected by a VSC‐MTDC system

Wang

Zhang

2021

IET Renewable Power Gen

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Asynchronous interconnection will reduce the inertia of each grid, and it is difficult for a small inertia grid to maintain frequency stability under the fluctuation of new energy or load. In order to improve the frequency stability of asynchronous power grids connected by a voltage source converters based multi-terminal direct current (VSC-MTDC) system, a joint primary frequency regulation (JPFR) strategy is proposed in this paper. The main principle of the proposed JPFR strategy is firstly to formulate frequency regulation protocols (FRPs) between asynchronous power grids. Next, an improved analytical steady-state model of the VSC-MTDC system is adopted. The improved model can calculate the power reference of each VSC according to the FRP, avoiding the impact on the grid not participating in the protocol. Then, based on the sequential search method, the results of the improved model are modified to prevent overload. Finally, simulations of a four-terminal VSC-MTDC system are carried out for validating the proposed JPFR strategy.

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Section: Validation Of the Improved Analytical Modelmentioning

confidence: 99%

Joint primary frequency regulation strategy for asynchronous power grids connected by a VSC‐MTDC system

Wang

Zhang

2021

IET Renewable Power Gen

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“…a) Control law: Among the numerous variants of frequency droop in the literature [26], we consider the following expression of the frequency droop control for Converter j…”

Section: B Solution 1: Local Controlmentioning

confidence: 99%

FCR Provisions by Multi-Terminal HVDC System

Shinoda¹,

Bakhos²,

Gonzalez‐Torres³

et al. 2021

Preprint

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Frequency control is considered to be an important function of multi-terminal HVDC (MTDC) systems. Sharing frequency containment reserves (FCRs) among interconnected AC systems using flexible HVDC technology is particularly attractive in the European context. However, coordination of the contribution between systems with different sizes, quality requirements and dynamic characteristics requires harmonized rules and well-defined control strategies. If the controllers are not properly designed, they can lead to disproportional supports, noncompliance with the existing regulation framework, or even degradation of the frequency quality. This paper analyzes several frequency control solutions for MTDC systems in terms of the adequacy of the expected contribution to the frequency containment process. The performance analyses are then confirmed using load-frequency models coupled with a three-terminal DC system. It is revealed that certain control solutions result in insufficient performance with respect to the desired FCR provision. The proposed distributed solution for each pair of converters can be the most compliant with the existing framework while keeping the highest degrees of freedom.

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“…Figure (8) and Figure (9) show the voltage of bus 11 in presence of introduced control systems with two objective functions of tracing reference voltage and minimizing control actions. Thus, the following results are obtained from this scenario:…”

Section: Scenario Imentioning

confidence: 99%

“…To prevent voltage collapse in a power system, we can use an optimal coordinated and proper arrangement of control actions which is called optimal coordinated voltage control (OCVC) [9]. Nowadays, coordinated voltage control (CVC) is successfully implemented in France, Italy, Belgium, and Switzerland [10][11][12][13][14].…”

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confidence: 99%

A quick solution to optimal coordinated voltage-control, based on dimension-reduction of power system via Modified Ward-PV

2021

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Voltage control and Voltage stability are the most important issues in the power system. The purpose of this paper is to investigate the emergency voltage control in power systems. One of the most important proposed methods to solve this issue is optimal coordinated voltage control (OCVC), which is based on the model predictive control (MPC). Time limitations for preventing voltage collapse is the most critical constraint to solve an OCVC problem. In this paper, the Modified Ward-PV will be proposed to reduce the dimension of the power system and consequently, the speed of solving problem is increased. In this method, immediately after occurrence a fault, the power system is partitioned to into three subsystems by spectral graph partitioning method. Partitioning is based on reactive power flow through the lines. The subsystems, which are far from fault, will be replaced by the reduced model. This method will drastically reduce the number of system equations and will boost the speed of solving problem. The simulations results obtained on New England IEEE 39-Bus System reveals that the proposed method acts more precise than dimension reduction of power system based on linearization of external subsystems, but the speed of solving problem decrease.

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Coordinated Voltage and Frequency Control in Hybrid AC/MT-HVDC Power Grids for Stability Improvement

Cited by 34 publications

References 24 publications

Joint primary frequency regulation strategy for asynchronous power grids connected by a VSC‐MTDC system

Joint primary frequency regulation strategy for asynchronous power grids connected by a VSC‐MTDC system

FCR Provisions by Multi-Terminal HVDC System

A quick solution to optimal coordinated voltage-control, based on dimension-reduction of power system via Modified Ward-PV

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