Reliability evaluation of modular multilevel converter based on Markov model

An analytical calculation method for the reliability sensitivity indexes of distribution systems is proposed to explicitly quantify the impact of various influence factors on system reliability. Firstly, the analytical calculation formulas for the reliability indexes of distribution systems are derived based on the fault incidence matrix (FIM). Secondly, the factors that affect system reliability are divided into two categories: quantifiable parameter factors and non-quantifiable network structure factors. The sensitivity indexes for the quantifiable parameter factors are derived using the direct partial derivation of the reliability calculation formulas. The sensitivity indexes for the nonquantifiable network structure factors are derived using the transformation of FIMs. Finally, the accuracy and efficiency of the proposed sensitivity calculation method are verified by applying them to an IEEE 6-bus RBTS system. This paper sums up the factors that influence system reliability in detail and gives the explicit analytical calculation method for the sensitivity of each factor. Repetitive calculation of the reliability index can be avoided during the sensitivity analysis. The bottleneck that affects the reliability level of distribution systems can be identified efficiently, and valuable information and guidance can be provided to enhance the reliability of distribution systems.

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“…We can see that the sensitivity result of μ i can be easily calculated using (7) and (8) as long as F B is obtained.…”

Section: ) Sensitivity Index With Respect To Component Repair Durationmentioning

confidence: 96%

“…The sensitivity result of one parameter is only valid if the other parameters remain unchanged. If the other parameters change, the sensitivity result is invalid and should be re-calculated [8].…”

Section: Introductionmentioning

confidence: 99%

Analytical Calculation Method of Reliability Sensitivity Indexes for Distribution Systems Based on Fault Incidence Matrix

Zhang

Wang

Luo

et al. 2020

Journal of Modern Power Systems and Clean Energy

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“…The voltage source converters based HVDC grids are expected to integrate large-scale renewable energy located far from the load center in the future [1]- [2]. Especially, with the development of the modular multilevel converter (MMC) [3], it becomes more feasible to apply the flexible HVDC transmission.…”

Section: Introductionmentioning

confidence: 99%

A Current-Commutation DC Circuit Breaker with Adaptive Reclosing Capability

Jiang

Zhao

2021

E3S Web Conf.

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DC faults are critical events in a flexible high-voltage dc (HVDC) grid. Thus, ensuring that the power system returns to normal operation rapidly and reliably after fault isolation is very important. This requires a HVDC breaker. In overhead line systems under temporary faults, reclosing is often required. However, once the dc circuit breaker (DCCB) is reclosed directly, the large second overcurrent may occur which could damage the power electronic devices. To avoid this problem, a current-commutation DC circuit breaker with adaptive reclosing capability is proposed. Compared with the traditional auto-reclosing strategy, the second damage under permanent fault condition can be avoided by the proposed DCCB, which can identify the fault property. Compared with the hybrid DCCB, the power electronic breaking branch composed of lots of IGBTs is replaced by the current-commutation branch, which is employed to interrupt bi-directional dc fault current. Moreover, bypassing branch is configured to reduce the energy dissipation of arrester and shorten the fault isolation time effectively. Finally, simulation cases in PSCAD /EMTDC verify the effectiveness and superiorities of the proposed DCCB.

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“…The sensitivity analysis method is split into two methods such as perturbation method 17 and partial derivative method, 18 which are used to evaluate the reliability indices. Several reliability indices are calculated in Reference 19 and are given as ENS (energy not supplied), SAIDI (system average interruption duration index), SAIFI (system average interruption frequency index), and ASAI (average service availability index) 20,21 …”

Section: Introductionmentioning

confidence: 99%

Islanding‐based reliability enhancement and power loss minimization by network reconfiguration using PSO with multiple DGs

Ramachandradurai

Kumarappan

2021

Int Trans Electr Energ Syst

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The distributed generation (DG) units are used more in the electrical networks to reduce the energy demand along with reducing the system losses and increasing the voltage profile of the load points. This paper presents an unintentional islanding detection, reliability enhancement, and power loss minimization of the restored system after an islanding event. The detection of islanding is performed by passive detection method of simultaneous measurement of voltage and frequency (vf)-based technique. The reliability of the system is increased along with the power loss minimization through reconfiguration by Particle Swarm Optimization (PSO) technique. The network reconfiguration is performed by identifying the most vulnerable buses, and reliability indices of the system are evaluated after the islanding event. The reliability indices act as a marker for validating the proposed reconfiguration strategy. The proposed method for islanding detection, reliability enhancement, and power loss minimization is compared with the existing methods available in the literature. The proposed method is tested on two different radial distribution system such as IEEE-69 and 118 bus systems, and the results obtained after the validation are promising.

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Reliability evaluation of modular multilevel converter based on Markov model

Cited by 16 publications

References 19 publications

Analytical Calculation Method of Reliability Sensitivity Indexes for Distribution Systems Based on Fault Incidence Matrix

Analytical Calculation Method of Reliability Sensitivity Indexes for Distribution Systems Based on Fault Incidence Matrix

A Current-Commutation DC Circuit Breaker with Adaptive Reclosing Capability

Islanding‐based reliability enhancement and power loss minimization by network reconfiguration using PSO with multiple DGs

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