MDVG is a new type of dynamic reactive power compensation device with high cost performance independently developed and developed by Chengdu Mailong Electric Co., Ltd. It is a new product developed based on advanced power electronic technology. The DVG device is connected in parallel to the power grid, which is equivalent to a controllable reactive current source. The reactive compensation current generated by it can quickly follow the change of the reactive current of the load, automatically compensate the reactive power required by the grid system, and filter at the same time. In addition to the low-order harmonics existing in the system, dynamic stepless compensation for grid reactive power and harmonics is realized.

　　(1) On-site application

　　MDVG package design for a commercial plaza in Chengdu. The project is located on a road in Chengdu, with a total construction area of 400,000 square meters, including three major parts: Grade A boutique office buildings, large shopping malls, and theme blocks.

　　(2) product model

　　Product type M-DVG-380-100/A represents Mellow Electric’s DVG product with a rated voltage of 380V and a rated capacity of 100kvar.

　　A: Single module product

　　B: The whole cabinet product composed of 20kVar modules

　　C: The whole cabinet product composed of 30kVar modules

　　D: the whole cabinet composed of 50kVar modules

　　E: The whole cabinet product composed of 70kVar modules

　　(3) Product features

　　1. High reliability: The products are strictly manufactured according to military standards, and the equipment is more efficient and reliable;

　　2. Faster response speed: MDVG has a full response time of 10ms, can quickly output inductive or capacitive reactive power, has a good compensation effect for fast-changing impulse loads, and can suppress the impact of voltage flicker.

　　3. Wider operating range: dynamic bidirectional (-1～1) reactive power can be continuously adjusted, that is, reactive power can be continuously output from rated inductive working conditions to rated capacitive working conditions, and compensation in any range can be achieved.

　　4. Higher safety: no over-compensation, no under-compensation, and no resonance.

　　5. Better harmonic characteristics: MDVG equipment itself does not generate additional harmonics, and can filter out the 13th and below harmonics generated by the system.

　　6. ​​Strong anti-interference ability: cabinet structure, the surface is treated with electrostatic spraying process, which has strong anti-electromagnetic interference ability.

　　7. Strong maneuverability: Human-machine interface and remote communication (Ethernet, RS485; Modbus/electric master protocol) are used to facilitate operation and management.

　　8. High availability: Modular design, drawer type structure, high power density, easy installation and maintenance.

　　(4) Product use

　　products have been widely used in rail transit, data centers, hospitals, high-end office buildings, hotels, stadiums, music theaters, airports, chemicals, power generation and other industries.

　　(5) Product parameters