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(I) Product Overview

ML-DVR(MOLO Dynamic Voltage Regulator) dynamic voltage recovery device is mainly used in the management of power grid voltage sag, short-term interruption, temporary rise of new power electronic equipment. The internal is equipped with an energy storage system connected in series between the system power supply and the sensitive load. It will continuously monitor the power supply voltage. When the power supply voltage is found to deviate from the rated voltage limit, the ML-DVR will quickly generate a power frequency compensation voltage injection system through the IGBT inverter system to ensure the stability of the sensitive voltage and ensure that the protected load is not affected by voltage changes. In addition, the device also has the functions of dynamic compensation of reactive current and suppression of power harmonics, which can comprehensively manage and improve the power quality of users.

(II) ML-DVR working principle

The grid voltage is within limits: When the grid is supplying the load (online mode), the inverter sleeps in standby, but remains synchronized with the grid voltage to act immediately in the event of a grid disturbance. The working principle of MDPA is as follows:

MDVR动态电压恢复装置

Voltage sag occurs: when the power grid is disturbed, the thyristor is rapidly turned off in both directions, thus isolating it from the power grid and supplying power to the load by the inverter INC system.

MDVR动态电压恢复装置

Voltage re-stabilization: the thyristors (SR1, SR2) are bi-directionally turned on, the inverter circuit INC system is re-connected to the power grid, the load will be powered by the power grid again, and the INC inverter system is in a rectified state to re-charge the energy storage capacitor.

MDVR动态电压恢复装置

Fail-safe bypass operation: In case of ML-DVR failure or maintenance, the load will automatically (or manually) safely transfer the bypass. That is, the current will be connected in parallel to the double reverse thyristor contactor or bypass switch, directly to the load power supply.

MDVR动态电压恢复装置

Dynamic voltage recovery simulation diagram

(III) Main Functions

1) Suppress voltage drop, surge and flicker at the system end

2) It has good dynamic voltage adjustment and compensation capability.

3) can effectively suppress harmonics, three-phase imbalance, improve power quality.

(IV) Performance parameters

1) When the high and low voltage of 0~130 p.u. occurs in the system, the voltage on the load side can be kept constant.

2) The response speed of the whole machine is less than 2ms

3) The impulse current within 7 times of the load has no effect on the DVR;

4) can control the voltage disturbance (voltage sag, voltage sag, short-term interruption) and other issues.

5) The efficiency of the whole machine is greater than 99%, saving a lot of electricity.

6) The design life of the whole machine is more than 15 years, the whole process is maintenance-free, duty-free, saving labor costs

7) Support the input three-phase voltage drop of 100, which can operate normally in any industrial load place.

8) The super capacitor is used as the energy storage element, the N 1 operation mode retains the redundant design, the number of charge and discharge reaches 1 million times, and the reliability is high.

(V) product model

MDVR动态电压恢复装置