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| Analysis and Optimization of Multi-Module Inductive Pulsed Power Supply System |
| Sun Hao, Yu Xinjie, Li Zhen, Li Bei, Liu Zhizhen |
| State Key Lab of Power System Department of Electrical Engineering Tsinghua University Beijing 100084 China |
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Abstract High-power pulsed power supply is an important part of the electromagnetic launch system. The pulsed power supply needs to provide the load with a current of mega-ampere magnitude and lasting for several milliseconds, and its volume should be as small as possible to ensure the mobility and concealment of the launch system. According to the form of energy storage, the pulsed power supply can be divided into different types. Among them, the inductive pulsed power supply (IPPS) with high energy density has great research value and application prospects. With the efforts of researchers from various countries, many IPPS modules have been developed and can output pulse current stably. But in practice, due to the limitations of inductor production technology, material characteristics and semiconductor switch performance, it is difficult for a single IPPS module to store too much energy. In order to meet the energy and current requirements of electromagnetic launch, it is necessary to study the cooperative work of a multi-module system. However, the many parameters, complex working processes, and crosstalk in multi-module operation bring significant challenges to the design of multi-module IPPS system.
Firstly, this paper explores the working process of the multi-module IPPS system. In order to improve the efficiency and safety of system operation, it is necessary to avoid the asymmetry of magnetic and electric circuit: For the crosstalk of magnetic circuit, it is found that the mutual inductance between the tiled inductors is very small and can be ignored; For the crosstalk of electric circuit, the method of load parameter multiplication can be used for equivalent analysis. With the equivalence of magnetic and electric circuits, the operation of the multi-module IPPS system can be simplified as a single-module problem that we are relatively familiar with.
Then, the numerical solution model of the multi-module IPPS system is established, which can use the geometric and electrical parameters and directly calculate the performance indicators. The numerical solution model includes the following five sub-blocks: geometric parameter preprocessing, inductance parameter calculation, module number calculation, circuit solution, and performance calculation. Based on this, this paper introduces genetic algorithm (GA) to optimize the system parameters. On the basis of fully considering the component performance margin and engineering implementation, the optimization is operated, and the parameters of the multi-module IPPS system with the highest energy density are obtained: Eight identical IPPS modules power the load parallelly and synchronously, achieving an energy density of 4.58MJ/m3 and a current output of 158kA, and its total energy slightly exceeds 600kJ.
Through simulation analysis, the multi-module IPPS system corresponding to the optimal solution can operate successfully. The performance indicators of the optimization calculation and simulation results are in good agreement, which preliminarily verifies the accuracy of the numerical solution and the effectiveness of the optimization method. The optimization results given in this paper can guide the actual system construction in the next step. In addition, although this paper is based on the analysis of the Meat Grinder with SECT circuit, the proposed numerical solution and optimization methods are still applicable to other topologies and scenarios.
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Received: 18 November 2021
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2023, Vol. 38 
