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| A Unified Optimal Placement Method for Multiple Types of Devices in Distribution Networks Considering Reliability Demand |
| Wang Yi1, Yang Zhifang1, Yu Juan1, Liu Junyong2 |
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;
2. College of Electrical Engineering Sichuan University Chengdu 610065 China |
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Abstract With the deepening of power system reform, providing high-quality and customized power supply reliability services to users is one of the important tasks of electricity enterprises in the future. Optimizing the placement of devices in the distribution network is an important foundation to realize an efficient supply of reliability services. However, the existing routing methodologies-based device placement modeling approaches ignore some combination actions of different devices and do not apply to the unified optimal placement problem for multiple types of devices with complex combination action mechanisms. To further improve the flexibility, accuracy, and economy of reliability service supply, this paper proposes a unified optimal placement method for multiple types of devices in distribution networks considering reliability demand.
Firstly, based on the analysis of network topology and device action characteristics, the device operation ability indicator matrix is constructed; secondly, based on the proposed matrix, combining the analysis of device combination action mechanism and device action performance, intermediate variables including action situation variables of the single device, the same type device combination, and the multiple types device combination are introduced are introduced and corresponding constraints are constructed to describe the relationship between device placement decision variables and user reliability index variables; thirdly, considering the investment, operation and maintenance cost of the devices and users’ differentiated reliability demand, a unified optimal placement model of multiple devices is established, formulated as a mixed integer linear programming problem, including sectional switches, circuit breakers, external tie lines, internal tie lines, tie line switches, backup lines, power switching switches, load control switches, etc.
The numerical simulation is developed based on the regional distribution network, which contains 11 substation nodes, 83 load nodes, 166 sectional switch or circuit breaker installation locations, and 50 tie line installation locations. It is assumed that the system contains three types of users A, B, and C, where the reliability level requirements or outage costs are highest for A users and lowest for C users. To verify the effectiveness and necessity of the proposed method, this paper sets up 9 comparison cases in each of the two situations of rigid and flexible reliability demand, according to the types of devices in the joint optimal placement. From case 1 to case 9, the types of devices considered in the joint optimal placement model increase gradually.
The following conclusions can be drawn from the simulation analysis: 1) considering rigid reliability demand, as the types of device increase, the rigid reliability demand of all users can be satisfied, and the total investment, operation and maintenance cost of the devices decreases; 2) considering flexible reliability demand, as the types of device increase, the total system cost, including the total investment, operation and maintenance cost of the devices, and the outage cost of users, decreases significantly; 3) considering flexible reliability demand, as the types of devices increase, the average interruption duration of all types of users shows a decreasing trend. The above conclusions indicate that the proposed method can give full play to the characteristics and combined effects of the multiple types of devices, and effectively improve the economy of device allocation and flexibility of reliability service supply.
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Received: 21 September 2022
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