Dynamic Voltage Regulator (DVR)
When the power line undergoes a voltage sag or surge, this may cause a critical security threat in power supplying for an enterprise. More seriously, it may cause significant property loss and personal loss. Use of a DVR alleviates such a threat or even avoids related loss.


A DVR is a cutting-edge power electronic device. It employs both advanced power electronic semiconductor technologies and control technologies to ensure safe use of electricity. To ensure stable power supplying to sensitive devices at the backend, our DVR uses world-leading control chips such as DSP/FPGA/CPLD to monitor line voltage quality. When a voltage sag or surge is detected, our DVR can instantly switch related backend devices to be powered by an inverter. The manipulation and shutdown of our DVR is controlled by software, and its typical switching cycle may be limited to no more than 1ms, making sure that the power supplied to the devices will not be interrupted. You can select supercapacitors or lithium batteries as backup power sources to meet your own requirements. The duration for backup power supplying depends on the capacity of those supercapacitors or batteries.

Product Features

• High reliability: Our cabinet applies an integrated design frame, which is highly environmentally adaptable, for it uses less components, and each of them has a powerful anti-shock function and long service life; it also provides a separate air way for cooling, where the air comes in from the bottom and out through the top, effectively preventing dusts from accumulating within the cabinet.
• Short response time: A global response time of less than 1ms ensures constant power supplying.
• Excellent charging capability: Our product supports charging energy storage units to their full capacities. Therefore, after a severe voltage sag occurs for the first time, it can rapidly charge the energy storage units that have been discharged. As a result, a problem that the voltage drops continuously in thunder and lightning weather can be effectively addresses.
• High utilization rate of energy storage units: A wider range of input DC voltages bring more convenience for you to optimize your initial investment.
• Ease of operation and maintenance: Use of supercapacitors contributes to a long service life and simplicity in maintenance; and our power control products employ a modular design.
• Intelligent management of energy storage units: We apply an intelligent system for super capacity management, and therefore, can detect in real time when a supercapacitor is working improperly.

DVR Working Principle

Our DVR is connected in parallel within a power grid system. When the grid voltage is normal, an SCR on the power source side is connected, and the power grid can directly feed various devices. At the same time, a bi-directional inverter is in a standby state and monitors in real time how the grid voltage fluctuates.
At the instant when an unexpected voltage fluctuation is detected, our DVR switches backend devices to be powered by a supercapacitor or other energy storage units. This ensures proper running of those backend devices will not be affected.
When the grid voltage goes back to normal, and our DVR determines that the power supplied meets related standards, it switches the backend devices to be powered by the power grid, and simultaneously charges the backup energy storage units over the bi-directional inverter.

DVR Model

DVR Technical Parameters

Series	DVR50 -150kVA	DVR200­­ - 350kVA	DVR400 - 450kVA	DVR500kVA or above
System Parameters
Rated voltage	208V, 220V, 380V, 400V, 415V, 460V, 480V
Rated capacity	50kVA, 75kVA, 100kVA, 150kVA	200kVA, 250kVA, 300kVA, 350kVA	400kVA, 450kVA	500kVA or above
Rated frequency	50Hz/60Hz, ±5Hz
Voltage range	-40% - +20% (You can set this value)
DC voltage	180 - 750Vdc (The minimum value can be adjusted as needed.)
Pieces to be integrated	8
Global efficiency	≥99%
Wiring mode	3-phase 3-wire; 3-phase 4-wire
Connection mode	Connect lines from both the top and the bottom
Air in/out	Air in from the bottom and out through the top
Performance Indicators
Overall response time	<1ms
Voltage precision	1%
Sag compensation capability	100%; compensation cycle 3s; for a longer cycle, add a supercapacitor as needed.
Overload capability	Overload 125%, lasts at least 10min; Overload 150%, lasts at least 1min
Cooling mode	Air-cooled
Noise	<68dB
Fixing mode	Cabinet
Dimensions (W*D*H mm)	600*1000*2000	Power cabinet: 600*1000*2000 Super-capacity cabinet: 600*1000*2000	Power cabinet: 600*1000*2000 Super-capacity cabinet: 800*1000*2000	For a capacity of 500kVA or above, you can adjust as needed.
Environment Parameters
Altitude	≤2000m, 2000m - 4000m (De-rating)
Operating temperature	-10ºC - 40ºC
Relative humidity	5% - 95%, non-condensing

Note: For DVR products of other specifications, contact us for further information

Structure of DVR50 - 150kVA

Better Power Quality, More Energy Saving

Wenzhou Modern Group(MODERN) is one of a leading company in designing and manufacturing Power Quality and Energy Saving products in the world.

Wide Power Solutions

Since 1979, MODERN has pioneered improvements in power solutions sectors for Industrial, Commercial, Medical, Broadcast and Telecom applications. Our products range various from Voltage Stabilizers, Voltage Optimizers, Voltage Regulator, Transformers and Reactors to Frequency Converters, UPS, Harmonic Filters, Power Factor Correction and Surge Protectors.

Experienced and Fully Customizable Solutions

All MODERN products are designed and manufactured with the worldwide ISO quality standards. Besides standard production, MODERN can be extremely flexible in developing and manufacturing special tailored specifications thanks to a proficient technology development.

Worldwide Service & Support

MODERN is well established in the international markets. Thanks to strategically positioned offices and distributors, MODERN’s products are installed and working in over 50 countries and regions around the world.

MODERN is committed to provide complete innovative and cost-effective power quality and energy saving solutions coupled with excellent customer service for all kinds of critical applications.