Parameter optimization design method for a fast-switch-based fault current limiter and circuit breaker

Zhang

Energy Science & Engineering

et al. 2019

To efficiently reduce the fault currents of active distribution networks (ADNs), this paper proposes a novel methodology for Pareto optimal allocation of resistive‐type fault current limiters (R‐FCLs). The proposed approach enables to simultaneously optimize the number, location, and size of the R‐FCLs in the ADNs with inverter‐interfaced and synchronous distributed generators (DGs). The sensitivity analysis is introduced to rank candidate locations, and a constrained multiobjective function is created to minimize the cost of the R‐FCLs and the fault currents of the ADNs. An improved multiobjective particle swarm optimization (MOPSO) algorithm and a multiobjective artificial bee colony (MOABC) algorithm are designed to obtain the Pareto optimal solution set. The proposed approach is verified using the modified IEEE 33‐node and 69‐node distribution systems, where both centralized and dispersed access of DGs are considered. The numerical results demonstrate that: (a) The fault currents in all nodes of the two testing systems are limited to the permissible levels using the least capital cost of the R‐FCLs, and (b) the improved MOPSO outperforms the MOABC to achieve a better Pareto front and decrease the number of iterative computation. In consequence, the feasibility and superiority of the proposed approach are well validated.

Section: Technical Discussionmentioning

confidence: 99%

Pareto optimal allocation of resistive‐type fault current limiters in active distribution networks with inverter‐interfaced and synchronous distributed generators

Zhang

Energy Science & Engineering

et al. 2019

“…When a fault occurs in the load side at t = t0, the CDBFCL control system changes the firing angle of the shunt bridge to produce the appropriate voltage against Vse to control id and subsequently iL. The KVL equation to obtain id and iL is expressed by the following equation: (4) Solving Equation (4) for id results in the following equation: (5) where i0 = iL(t = t0), and iL is expressed by the following equation, approximately: (6) In (6), Leq= Ls, Req = Rs, and tan and Vse=2Vm/π, which represents the DC value of the series bridge circuit voltage.…”

Section: Fault Operating Conditionmentioning

confidence: 99%

“…They can limit the short-circuit current without changes in MG configuration at a predefined level in the shortest possible time. They also have no influence on normal operation of the grid [5,6].…”

Section: Introductionmentioning

confidence: 99%

Controllable-Dual Bridge Fault Current Limiter for Interconnection Micro-Grids

et al. 2021

Different types of fault current limiters (FCLs) have been developed and designed based on non-superconducting DC reactors (NSDRs). This paper proposes a controllable dual-bridge FCL (CDBFCL) based on the NSDR for use in an AC-type micro-grid. It includes a NSDR and two series and shunt bridge circuits. The series bridge is based on diode semiconductor switches and is coupled in series with the line via a transformer. The shunt bridge is based on thyristor semiconductor switches and is coupled in parallel with the line. The shunt bridge provides a variable voltage source. It compensates for the DC side voltage drop due to NSDR resistance and semiconductor switches during normal operating condition. In addition, by controlling the shunt bridge firing angle, it produces a controllable DC voltage, which can control the fault current amplitude during a fault. The structure, principle operating work, and control system of the proposed CDBFCL are presented. The CDBFCL performance is studied analytically and through simulation by the PSCAD/EMTDC software. In addition, the simulation results are compared with those obtained experimentally from a prototype CDBFCL and show a close correlation.

“…Series or parallel resonance FCLs composed of LC circuits and power electronics need further operational validation [7][8][9][10]. The performance of bypassing reactors depend on the reliability of fast switches [11]. It requires the fast switch to interrupt at the first fault current zero in a few milliseconds.…”

Section: Introductionmentioning

confidence: 99%

Analysis of influence of a novel inductive fault current limiter on the circuit breaker in 500 kV power system

et al. 2021

A contribution to the engineering application of a proposed 500-kV fault current limiter (FCL) is presented. A new type of FCL composed of a highly coupled split reactor (HCSR) and fast switches is proposed. When the circuit breaker (CB) in series with the FCL in the 500-kV power system interrupts the limited fault current, the rate of rise of the recovery voltage (RRRV) reaches a value much higher than the rated value. Based on a simplified equivalent single-phase circuit, the influence of the new FCL on the interruption procedure of the CB is simulated and discussed. The simulation results show that the high RRRV is caused by highfrequency resonant oscillations between the HCSR and its parasite capacitance. Analysis indicates that when the reactance of the FCL is close to the short circuit reactance of the system, the RRRV will reach the highest value. To solve this issue, we proposed installing a shunt capacitor with the FCL. Simulation results showed that the RRRVunder all fault modes could be restrained to below the rated value by introducing a certain shunt capacitor.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.