Uninterruptible energy storage power supply configuration accessories
The UPS power system consists of five parts: the main circuit, bypass,
battery and other power input circuit, rectifier (REC) for AC/DC conversion,
inverter (INV) for DC/AC conversion, inverter and bypass output switching
circuit and storage battery. The voltage regulation function of the system is
usually completed by the rectifier, the rectifier device uses thyristor or
high-frequency switching rectifier, itself has the function of controlling the
output amplitude according to the change of the external power, so that when the
external power changes (the change should meet the system requirements), the
output amplitude is basically unchanged rectifier voltage. The purification
function is completed by the energy storage battery, because the rectifier can
not eliminate the instantaneous pulse interference, the voltage after
rectification still has interference pulse. In addition to the function of
storing direct DC energy, the energy storage battery is like connecting a large
container capacitor to the rectifier, and the size of its equivalent capacitance
is proportional to the capacity of the energy storage battery. Since the voltage
at both ends of the capacitor cannot be mutated, that is, the smooth
characteristics of the capacitor to the pulse are used to eliminate the pulse
interference, and the purification function is played, also known as the
shielding of interference. The frequency stability is completed by the
converter, and the frequency stability depends on the stability of the
oscillation frequency of the converter. In order to facilitate the daily
operation and maintenance of the UPS power system, the system work switch, the
automatic bypass switch after the host self-check fault, and the maintenance
bypass switch are designed.
When the power grid voltage is working normally, power supply the load, as
shown in Figure 1-1, and charge the energy storage battery at the same time.
When there is a sudden power failure, the UPS power supply starts to work, and
the energy storage battery supplies the power required by the load to maintain
normal production (as shown in black →). When the load is seriously overloaded
due to production needs, the power grid voltage is directly supplied to the load
through rectification
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