Abstract
With the sustainable growth in the integration of distributed generation units in the distribution network, the probability of the fault current level exceeding the rating of existing components increases. Cascaded H bridge fault current limiter is widely used in the power grid due to its advantage in inhibiting surge current flexibly. In order to equilibrate the objective functions of its cost, fault current mitigation effect, and the weighted load reliability index, a novel methodology is proposed to simultaneously optimize the location and size of the limiters in the distribution network. Therein, the sensitivity factor considering the Monte Carlo fault simulation model is introduced to reduce the search space and rank candidate locations referencing the actual conditions. And then, according to the candidate locations and considering different conflicting objective functions, a multi-objective improved bat algorithm is employed to obtain the Pareto optimal solution set. Also, life cycle cost and net present value are introduced to construct an economic model to access the scheme costs and service life. The proposed approach is verified using the modified IEEE 33-bus distribution systems with DGs and IEEE 30-bus Benchmark system. The results demonstrate that the proposed method exhibits higher efficiency in finding optimum solutions and provides a new economic configuration idea for the practical engineering application.
Highlights
Because of the increasing demand for electricity and continuous growth of distributed generations (DGs), fault current has been larger
The results show that the multi-objective improved bat algorithm (MOIBA) algorithm has better convergence and uniformity than the traditional multi-objective optimization algorithm
SIMULATION AND RESULTS This section is devoted to verifying the optimal allocation method of the CHB-fault current limiters (FCLs) in the IEEE 33-bus system and IEEE 30-bus Benchmark system
Summary
Because of the increasing demand for electricity and continuous growth of distributed generations (DGs), fault current has been larger. FCLs present a high impedance to limit the short current. These approaches have some drawbacks: owing to the heat dissipation problems of SFCL, it cannot be widely used. Z. Shu et al.: Pareto Optimal Allocation of FFCL Based on Multi-Objective Improved Bat Algorithm converters, cascaded H-bridge current limiters (CHB-FCLs) are widely favored, which can effectively alleviate surge current and are suitable for medium voltage distribution network environment [5], [6]. Considering the objectives of the cost, fault mitigation, and Weighted Load Reliability Index (WLRI), a multi-objective improved bat algorithm (MOIBA) is proposed to obtain the Pareto optimal set and compared with MOPSO and NSGA-II. When CHB-FCL is inserted in the branch ij, the modified self-impedance Zii is derived as follows [14]: Zii
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
