HVdc Circuit Breakers: Prospects and Challenges

Raza, Ali; Mustafa, Ali; Alqasemi, Umar; Rouzbehi, Kumars; Muzzammel, Raheel; Song, Guobing; Abbas, Ghulam

doi:10.3390/app11115047

Cited by 23 publications

(11 citation statements)

References 111 publications

(149 reference statements)

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“…L a as equivalent arm inductance is modeled in the DC side given by L arm = (2/3)L for the average model of MMC. It is assumed that the power on the AC side is equal to the power on the DC side in the PCC, the linear dynamic of DC-link capacitance can be expressed as: 2 Δu eq (23) The subscript "o" shows the operating point. The DC voltage u dc that across C eq and L a is the voltage to be controlled voltage.…”

Section: Dynamic Performance Analysismentioning

confidence: 99%

“…DC circuit breakers (DCCBs) are one of the most effective tools for fast fault isolation [1]. Despite developments in DCCB technology, still they need to large DC reactors to reduce the rate of rising fault currents [2]. Capacitor and DC reactor connected to HVDC grid and inductance and capacitance of HVDC transmission lines make a kind of LC filter, which seriously affects the dynamic response of DC link voltage and its instantaneous power in MT-HVDC grid, especially in the long lines [3].…”

Section: Introductionmentioning

confidence: 99%

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A modified droop control structure for simultaneous power‐sharing and DC voltage oscillations damping in MT‐HVDC grids

Azizi

CheshmehBeigi

Rouzbehi

2022

IET Generation Trans & Dist

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With increasing energy demand, the use of renewable energy resources is increasing. Renewable energy sources require power electronic converters to get integrated into power grids. Multi‐terminal high voltage direct current (MT‐HVDC) systems are a promising solution for their grid integration. Using droop‐based controller strategies in power converter stations of MT‐HVDC grid, in addition, to providing power‐sharing, can support the frequency of the connected AC grids. However, power changes lead to direct voltage deviations, thereby disrupting the stability of the MT‐HVDC system. Here, a new control structure for the droop controller of the voltage source converter (VSC) controller is proposed which is named modified droop controller (M‐Droop). This method, in addition to power‐sharing, uses an appropriate control action to provide the required voltage stability. Here, analytical studies of the modified control strategy are reported. Moreover, through a developed MATLAB Simulink platform, its performance is verified in the events of transients, consisting of fault, variable load, and change in power generation.

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Section: Dynamic Performance Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A modified droop control structure for simultaneous power‐sharing and DC voltage oscillations damping in MT‐HVDC grids

Azizi

CheshmehBeigi

Rouzbehi

2022

IET Generation Trans & Dist

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show abstract

“…In this case, the best way to deal with the fault currents is fast separation, which is being done using HVDC circuit breakers direct‐current circuit breakers (DCCBs) [10]. However, currently, these devices rely on a relatively large DC reactor to limit the increase in fault current [11]. The DC reactor size of DCCB depends on DCCB reaction time and maximum current and affects its cost [12].…”

Section: Introductionmentioning

confidence: 99%

Direct current power system stabilizers for HVDC grids: Current status

Azizi,

Moradi,

Rouzbehi

et al. 2023

IET Generation Trans & Dist

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A power system stabilizer (PSS) is a control system integrated into the control structure of specific generation units within AC grids. It monitors current, voltage, and machine shaft speed. Analysing these variables, the PSS generates appropriate control signals to the voltage regulator unit, aiming to damp system oscillations. With the advancement of high‐voltage direct current (HVDC) overlaid high‐voltage alternative current (HVAC) grids, it is anticipated that direct current power system stabilizers (DC‐PSS) will be developed to perform a similar role as their AC counterparts. DC‐PSS will be responsible for monitoring and controlling DC voltage levels, ensuring stable operations. This paper focuses on DC‐PSS in HVDC grids, designed to ensure stable operation and mitigate voltage fluctuations. Unlike conventional AC power systems, HVDC includes only DC voltage and power. The input signal for DC‐PSS is the variations in DC voltage, and the output signal is proportional to the power changes at the specific bus where the DC‐PSS is installed, aiming to minimize DC voltage oscillations. These characteristics pose significant challenges in DC‐PSS. The paper addresses the challenges and highlights issues such as inertia and low‐frequency oscillations associated with DC‐PSS. Various control methods are presented and a comparison is made among these methods.

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“…To match the capacity of a HCB with a VSC-HVDC system, a FCLC can be used with HCB. Some FCLC based HCB or independent FCLC have been proposed, but they contain certain disadvantages [38][39][40]. One of the major disadvantages of existing FCLC approaches is that some FCLC components remain inside the circuit for both normal and fault conditions.…”

Section: Introductionmentioning

confidence: 99%

A hybrid circuit breaker with fault current limiter circuit in a VSC-HVDC application

Aḥmad

Gong

Nadeem

et al. 2022

Prot Control Mod Power Syst

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A conventional hybrid circuit breaker (HCB) is used to protect a voltage source converter-based high voltage direct current transmission system (VSC-HVDC) from a short circuit fault. With the increased converter capacity, the DC protection equipment also requires a regular upgrade. This paper adopts a novel type of HCB with a fault current limiter circuit (FCLC), and focuses on the responses of voltage and current during DC faults, which are associated with parameter selection. PSCAD/EMTDC based simulation of a three-terminal VSC-HVDC system confirms the effectiveness and value of HCB with FCLC, by using an equivalent circuit modelling approach. Laboratory experimental tests validate the simulation results. The peak fault current is reduced according to the current limiting inductor (CLI) increase, and can be isolated more quickly. By adopting parallel metal oxide arrester (MOA) with the main branch of HCB, voltage stresses across the breaker components decrease during transient and continuous operation, and less energy needs to be dissipated by the MOA. The remnant current for all cases is transmitted to power dissipating resistor (PDR) in the final stage, and the fault current is reduced to the lowest possible value. When the current from the main branch is transferred to the FCLC branch, transient voltage spikes occur, while smaller PDR is required to absorb current in the final stage.

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HVdc Circuit Breakers: Prospects and Challenges

Cited by 23 publications

References 111 publications

A modified droop control structure for simultaneous power‐sharing and DC voltage oscillations damping in MT‐HVDC grids

A modified droop control structure for simultaneous power‐sharing and DC voltage oscillations damping in MT‐HVDC grids

Direct current power system stabilizers for HVDC grids: Current status

A hybrid circuit breaker with fault current limiter circuit in a VSC-HVDC application

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