MSpowerDVR Low Voltage Ride-Through Device

Product Overview

The MSpower series low-voltage ** device, as one of the 400V motor safety power sources, is widely used in industries such as petrochemicals, steel, and smart manufacturing. Continuous production enterprises are affected by grid fluctuations, leading to issues like voltage disturbances and voltage sags. Voltage disturbances often originate from the upper-level power distribution, posing risks of sudden shutdowns for motors and frequency converters.

The concept of low-voltage ** originated from wind farms, aiming to maintain grid connection and ensure power generation capacity during system faults and voltage drops, thereby reducing grid fluctuations. It has now been extended to various sensitive critical loads. For such loads, restarting cannot guarantee process continuity. The MSpower series low-voltage ** device, through close integration with frequency converters or general motors, ensures the continuous and safe operation of motors during grid transient disturbances and short-term power outages.

The MSpower DVR series low-voltage ** device (also known as DVR dynamic voltage regulation device or DVR dynamic voltage restoration device), hereinafter referred to as DVR, offers more comprehensive advantages compared to conventional motor safety power sources. DVR employs precise measurement of the power grid, intelligent identification of operating conditions, system bus technology for real-time monitoring of grid voltage, rectifier modules, inverter modules, DC bus voltage, etc., and uses an industrial touchscreen for real-time dynamic display of operating conditions. It provides comprehensive solutions for voltage swell, sag, interruption, and overvoltage protection for electrical equipment. Compared to products like online UPS, DVR offers high cost-effectiveness, maintenance-free operation, and a small footprint.

When issues such as voltage swell or sag occur, our MSpower DVR series low-voltage ** device supports rapid uninterrupted switching for electrical loads, ensuring continuous power supply voltage until the DVR backup energy storage unit is depleted or grid power returns to normal. The actual support time of the MSpower DVR series low-voltage ** device depends on the capacity of the electrical load and the capacity of the DVR energy storage unit, which typically consists of supercapacitor modules.

Main Product Features

☆ The device adopts a fully enclosed cabinet design with strict separation of high and low voltage, ensuring strong anti-interference capability;

☆ Bypass operation mode, not increasing the original system risk;

☆ Dynamic tracking of grid conditions with short switching delay;

☆ Low standby power consumption and minimal long-term operational losses;

☆ Comprehensive device testing functions, facilitating on-site debugging and inspection;

☆ System redundancy design for reliability and stability;

☆ Holographic system recording and full lifecycle prediction;

☆ Touchscreen dynamic display for simple operation and maintenance;

☆ Multiple self-check methods for key components to ensure long-term stability and reliability;

☆ Intelligent air-cooling system and active heating and dehumidification system to ensure optimal operating conditions.

Product Models and Configurations

Product Principle

MSpower DVR Main Power Circuit Schematic

The rectifier module performs AC/DC conversion, the super energy storage system stores energy, and the inverter module outputs inverted power. The DVR dynamic voltage regulation device achieves seamless switching between inverter output and grid power through a static switch.

When the device detects that the grid voltage exceeds the normal set value, the DVR switches the power supply mode for the load from grid power to energy storage inverter power. The rapid switching process is typically completed within about 2ms. When the grid voltage returns to within the safe threshold, the system automatically switches back to grid operation.

Initial power-on requires a basic preparation process for system self-check, pre-charging of the energy storage system, and grid voltage synchronization. If the self-check is normal, the grid-side static switch closes, and power is supplied by the grid voltage. The energy storage unit charges automatically, and the inverter remains on standby. If the self-check is abnormal, the bypass contactor closes, and an alarm is output. If the DVR dynamic voltage regulation device has insufficient stored energy during inverter power supply, the system will no longer judge the grid voltage condition and will directly switch to grid power supply to ensure power reliability.

Product Appearance and Dimensions