以下为句子列表：
英文: In this paper, PWM double-bridge superposition regulator, AC chopping regulator and series voltage regulator were analyzed.
中文: 摘要分析了PWM双桥叠加型、交流斩波型和串联型3种变频型交流电压调节电路。
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英文: It pointed out that series voltage regulator had higher performance cast ratio and was the best plan for AC voltage regulation.
中文: 对其工作原理进行了对比研究，指出串联型电压调节装置的性能价格比高于其他方式，是目前交流电压调节装置中较好的一种方案。
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