中文摘要：

调频式谐振特高压试验电源是进行特高压交流电气设备试验研究不可缺少的装置。提出采用大功率开关器件绝缘栅双极晶体管（insulated gate bipolar transistor，KGBT）来代替模拟器件产生特高压试验所需的正弦信号，结构简单、元器件数目少、易维护。整个装置由不可控整流电路、H桥逆变电路、升压变压器及串联谐振电路组成。在深入分析其工作机制的基础上建立了系统的数学模型。同时，以该模型为被控对象，对其电压调节采用自调整比例—积分控制策略，对其频率调节采用比例—积分锁相自动调频控制策略，并推导了控制模型。实验结果表明所提控制方案的正确性和新型调频式谐振特高压试验电源的有效性。

英文摘要：

The UHV frequency-tuned resonant test power supply （UHV-FTRTPS） has become an indispensable and important equipment in UHVAC devices testing. In this paper, based on high-power switching devices insulated gate bipolar transistor （IGBT）, a novel sinusoidal signal generator applied to UHV-FrRTPS is developed. The generator possesses plenty of merits： uncompounded structure, less components and easy maintenance. The novel UHV-FTRTPS is composed of uncontrolled rectifier, H bridge inverter, step-up transformer and series resonant circuit. Based on the analysis of the working principle of UHV-FI＇RTPS, its mathematical model is established in this paper. Moreover, by use of this model, the self-adjusting PI control strategy is proposed to modulate the voltage. Then PI phase-locked frequency-tuned control strategy is issued to modulate the frequency and its control model is derived. Finally, experimental results verify the validity of the proposed control strategies and the novel UHV-FrRTPS.