基于FPGA的高压交联电缆测试电源的研制

Research on the Test Power Source for High-voltage XLPE Cable Based on FPGA

分析了串联谐振的原理并通过推导得出谐振电容两端电压的关系式,结合目前国内高压电缆耐压测试的发展现状,证明了变频串联谐振试验方法的优越性。对于控制部分,利用现场可编程门阵列(FPGA)实现了自动频率跟踪,使得整套系统的控制精度得以提高。经测试结果表明,研制的耐压测试电源样机具有操作简单、控制方便、体积小、重量轻等优点,在输出功率为6 kW的情况下,可以使电缆试品上承受的电压稳步升高到18 kV,满足了18 kV以下交联聚乙烯(XLPE)电缆的耐压测试要求。

This paper analyses the theory of series resonant and infers the relationship between resonant capacitor volt- age.It proves the superiority of series resonance combined with the present status of development on the dielectric voltage withstand test of high-voltage cable.Towards the control section FPGA is used to realize the automatic frequen- cy tracking, thus control accuracy of the entire system is improved.The experimental result shows that the designed dielectric voltage withstand test power prototype has advantage of simple operation, convenient control, small volume, light weight and so on.It can make the product of cable test voltage Steadily rise to 18 kV,which satisfies XLPE ca- ble dielectric voltage withstand test requirements below 18 kV.