EPS solution based on Delta inverter

1 Introduction

EPS (Emergency Power Supply) is the abbreviation of emergency power supply. EPS is widely used in industrial and civil buildings, where sudden power outages will cause significant economic losses to normal production and life. It is an important part of modern building safety protection facilities. EPS is generally used as a backup support power supply for firefighting or production in emergency situations. For example, in high-rise buildings, shopping malls, hospitals, rail transit, underground shopping malls and other places with many people, few exits and limited natural light sources, once a fire occurs or the power grid is damaged, the light source disappears and it is pitch black. At the same time, there are many people and few exits, and the consequences will be disastrous. At the same time, the fire brigade will be unable to carry out disaster relief work due to the lack of power supply, which will aggravate the degree of the disaster. It can be seen that EPS plays an increasingly important role in the safety of modern society and is the patron saint of the "urban lifeline system".

At present, the control methods and control means adopted by EPS are different. The loads carried by EPS can be summarized into three types: the first is EPS mainly used for emergency lighting and accident lighting; the second is three-phase series EPS used for mixed loads such as air conditioners, elevators, rolling doors, exhaust fans, water pumps, etc. in addition to emergency lighting and accident lighting; the third is the variable frequency series EPS that directly supplies power to the motor . This article introduces the most comprehensive three-phase series EPS power supply for mixed loads.

2 EPS system based on Delta inverter

Delta's EPS solution mainly uses the inverter to drive the inverter AC motor for the fans, water pumps and rolling shutters of the fire protection system. Delta's customized EPS inverter can truly realize the connection of the common DC bus, so it can be used not only in the EPS industry, but also in the chemical fiber and glass manufacturing industries. The Delta dedicated inverter and synchronization card are used in combination to achieve the same input and output phases, thus meeting the application of special occasions. In view of the particularity of the motor drive in the EPS industry, Delta's inverter mainly adds parameters such as automatic torque compensation, torque compensation limit, and abnormal restart to meet the needs of special industries. The EPS charging module matched with the inverter reduces costs for customers, reduces heavy transformers, and reduces transportation costs.

2.1 Overview of EPS Special Machines

One of the main features of Delta EPS dedicated machine is that it can realize the common DC bus, thus expanding the application field of EPS dedicated machine. At the same time, the DC conversion of the internal contactor and soft start circuit meets the battery direct start requirements of EPS dedicated machine. Delta EPS dedicated inverter can form a highly reliable hybrid load dedicated inverter by matching with appropriate low-pass filter and transformer . And ensure the output voltage stability and waveform smoothness of the inverter. Delta EPS emergency power dedicated inverter must meet the application of most occasions in the EPS industry, and is the preferred dedicated inverter of EPS manufacturers.

2.2 Features of Delta EPS

(1) The auxiliary power supply and soft start circuit contactor of the inverter are all DC-powered, so direct DC power supply can be fully realized.

(2) Super strong hardware and software protection functions ensure the reliability of the inverter.

(3) It contains multiple modulation methods, so it can be used with a variety of transformers, thus ensuring that the output voltage waveform is closer to a sine wave.

(4) Delta EPS dedicated inverters are available in two specifications: AC380V and AC220V, with a power range from 0-220KW, which can meet the needs of customers in different occasions.

(5) The use of synchronization card ensures the same input and output phase.

2.3 Delta EPS dedicated inverter application design

(1) Electrical principle design. The principle of the EPS with AC and DC dual power supply is shown in Figure 1. The principle of the EPS with DC single power supply is shown in Figure 2.

(2) Definition of control terminals

2.4 Delta EPS inverter special parameter design

3 Conclusion

Delta's EPS dedicated inverter truly realizes customized service. It is developed completely according to the technical characteristics of the EPS industry and meets the needs of EPS industry customers. Delta inverters have been well received by users for their strict quality management and high cost performance. Through Delta's strict quality management, excellent performance and strong technical support capabilities, customized service is truly realized.