基于电力线通信的并联UPS逆变器的均流控制

在UPS逆变电源的无互联线并联运行中，下垂特性控制是一种较为有效的控制方案，但这种方案不可避免地会带来系统输出电压的稳态误差。文中提出了一种新的逆变器无互联线并联运行方案，即各并联逆变器通过低压交流输出母线，以电力线载波通信的方式交换彼此的信息，从而实现负载的有功和无功的均分。通过两台3kVA的单相逆变器实验验证，实验结果表明了这种无互联线并联运行方案的有效性。

WIRELESS PARALLEL OPERATION SCHEME OF INVERTERS BASED ON POWER LINE COMMUNICATION

The droop characteristic with no control interconnection is an effective control scheme for the wireless parallel operation of inverters in UPS. With the application of the scheme, however, the AC system may produce steady-state errors of output voltage in parallel system. This paper presents a novel control technique for the wireless parallel operation of inverters, in which the inverters exchange the information based on the low-voltage AC bus. This scheme can achieve excellent characteristics both in steady states and in transient response, so that the active and reactive power of load are shared equally. Experiments have verified the effectiveness of the scheme with two single-phase 3 kVA inverters in parallel operation. This work is supported by National Natural Science Foundation of China (No. 50007004).