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为保证航管雷达稳定可靠的运行,目前民航所有的航管站都配备了不间断电源系统即UPS,从而实现了对航管雷达的不间断供电。要对负载不间断地供电,唯一可行的办法就是用两套电源同时对负载供电。当两套交流电源并联运行时,最基本的条件是同频率、同相位。UPS的运行方式之一就是采用一套逆变器将直流电变为交流电,与市电并联运行。在市电正常时,UPS的频率和相位应该跟踪市电的频率和相位。若UPS的频率保持
In order to ensure the stable and reliable operation of the air traffic control radar, at present, all of the civil aviation air traffic control stations are equipped with an uninterruptible power supply system, that is, the UPS, so that an uninterrupted power supply to the air traffic control radar can be realized. The only workable way to power the load uninterruptedly is to power the load simultaneously using two power supplies. When the two sets of AC power parallel operation, the most basic condition is the same frequency, with the phase. One of the UPS operating modes is to use a set of inverters to convert DC into AC and operate in parallel with the mains. When mains is normal, the frequency and phase of the UPS should track the frequency and phase of mains. If the UPS’s frequency is maintained