One, EPS
EPS (Emergency Power Supply) is an emergency power supply. As a fire-fighting equipment, municipal facility, medical facility, enterprise, factory, or other equipment, the power supply equipment for emergency power can be provided when the mains power grid fails. Compared with the conventional standby generator emergency power supply, EPS has obvious advantages in terms of starting speed, noise and vibration, maintainability, power supply quality, overload capacity, self-protection characteristics, and environmental pollution.
EPS is divided into three types according to different types of loads: lighting type, power type, and illumination type. The corresponding loads are lighting load, motor load (fire pump, etc.), and lighting and motor mixed load.
Second, the application requirements of the inverter in the EPS power supply industry
When the utility power is not normal, the EPS is driven by the internal inverter output AC power, and the inverter plays the role of the inverter in the EPS. Therefore, the inverter must meet various requirements of the EPS to ensure the same power quality as the mains.
The EPS supplies power to the inverter through the battery pack, so the auxiliary power supply of the inverter must be supplied with DC power. The auxiliary power input for the AC input cannot meet the requirements of the EPS. The same principle, the cooling fan of the inverter can not use the AC fan, and the soft contactor of the inverter cannot use the AC contactor.
Since EPS is an emergency power supply device that replaces mains electricity, EPS output voltage quality is also an important indicator, including harmonic content of EPS output voltage, load adjustment rate of EPS output voltage, and stability of EPS output voltage. In this way, it is required that when the load changes or the battery voltage changes within a certain range, the inverter output voltage change is as small as possible, and the harmonic content of the output voltage is sufficiently small.
In very important occasions, the EPS needs to have a strong start function, that is, when the battery pack is low in battery power, the battery pack supply voltage to the inverter is lower than the input voltage undervoltage point of the inverter, but the inverter still needs to work normally and has a certain voltage. Current output capability does not allow for undervoltage faults.
三ã€Characteristics of Ziri EPS Special Inverter
At present, the EPS power converters on the market are almost blank, and the prices of several compact brands are also very expensive. To this end, Ziri Electric Technology Co., Ltd. has developed a new generation of cost-effective EPS special-purpose inverters (ZVF9V-E series) based on the characteristics of the EPS power supply industry, and with more than 10 years of experience in R&D and production of the inverter industry. It can meet the various requirements of EPS power supply and effectively improve the performance of EPS power system.
Ziri ZVF9V-E series inverters have the following features:
1. The ZVF9V-E series inverter can directly supply DC power without adding other power lines. The auxiliary power supply, cooling fan and soft-power contactor of the inverter do not need separate AC power supply.
2. ZVF9V-E series inverter has two specifications of DC 500V and DC 300V, with power ranges of 1.5KW~315KW and 0.75KW~110KW, respectively.
3, ZVF9V-E series inverter through a high carrier frequency PWM output, after the EPS filter reactance and capacitance can output a nearly sinusoidal voltage waveform, voltage harmonic content is small. In addition, the inverter has its own voltage regulator function, which can automatically adjust the output voltage to ensure that the output voltage of the EPS remains unchanged when the battery voltage changes within a certain range (for example, the load changes or the battery pack has insufficient power).
4. The undervoltage point of ZVF9V-E series inverter can be adjusted between DC 360-480V. The overvoltage point can be adjusted between DC 660-760V to meet the requirements of different customers.
5, the wiring diagram is as follows