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Dynamic Voltage Restorer (DVR)

A Dynamic Voltage Restorer (DVR) uses modern power electronics technology to control power quality and provide specific power supplies to users. System voltage disturbances causing short-term voltage drops (a few cycles to tens of cycles) on the load side are a major cause of malfunctions in sensitive loads and computer equipment. A DVR generates a compensating voltage within 1-2 milliseconds to offset the disturbances, ensuring the load side voltage is unaffected and guaranteeing the safe and reliable operation of sensitive loads and computer systems.

Your Professional Dynamic Voltage Restorer (DVR)Supplier！

Leonhard (Shanghai) Electricity Co., Ltd. (LEONHARD) established in 2017, is a high-tech enterprise in the field of power quality, specializing in modern, professional, and intelligent high-quality products and services.As a pioneer and leader in power quality solutions, LEONHARD specializes in R&D, production, and sale of Active Harmonic Filter, Static Var Generator, Hybrid Var Compensator System,Dynamic Voltage Restorer,VFD DC Link System,Unified Power Quality Conditioner.

why choose us

Professional Team

Leonhard is the first company in China to apply SiC MOSFET to the power quality industry. It has advanced manufacturing equipment and a professional R&D team. Through continuous improvement and R&D, its SiC series products have now reached the third generation.

Our Certifications

Our products are backed by CE certification, patents, and third-party testing reports. With successful projects across multiple international markets, we understand global standards and application requirements.

Sales Market

Our power quality products have been widely used in Poland, Mexico, Belarus, Cambodia, Thailand, Vietnam, Dortmund and other countries.

Our Service

We provide end-to-end service from pre-sales system design to installation, commissioning, and after-sales support. With 24/7 technical assistance and regular maintenance services, we help ensure stable system operation over time.

Product Specification

We offers the following product specifications：

Parameter	Specification
Output Voltage (Range)	3Φ 380V ±20% (three-phase four-wire), allows short-term drop up to 50%
Output Frequency	40–70 Hz
Output Voltage (Accuracy)	3Φ 380V ±5% (adjustable)
Regulation Accuracy	±1%
Power Components	IGBT
Compensation Method	MPWM (Pulse Width Modulation), inverter-based compensation
Dynamic Tracking Time	1 ms
Harmonic Voltage Compensation	THD < 2%
Voltage Adjustment Mode	Independent three-phase adjustment with automatic phase balancing
Anti-Harmonic Interference	Operates normally under severe waveform distortion
Peak Suppression	Input 4000V single pulse, output limited to < 40V
Filter Performance	0.15M–10M, differential mode: 70–100 dB, common mode

Product features

High reliability, designed for industrial load

Multi-stage protection, simple circuit, high reliability, maintenance-free.

High system efficiency and fast response speed

Efficiency up to 99.2%; the protection switching time is not more than 2 ms; single phase, two phase, three phase drops to 0% can be managed.

Superior rectifier performance, no harmonic injection

Adopt fourth-generation insulated gate bipolar transistor (IGBT) power device, and multiple protection technologies are used to ensure the absolute reliability of the equipment, advanced IGBT green rectifier technology, no harmonic injection pollution, and improve the power utilization.

All digital control technology based on DSP, high reliability

Using a 32-bit state-of-the-art digital signal processor, which enables DVR to achieve extremely high performance and reliability through advanced, flexible logic algorithms.

Dynamic Voltage Restorer For Power Quality Improvement suppliers

Advanced Parallel Expansion Function, Modular Design

Parallel expansion function increases the capacity of the DVR system and redundant backups, which improves the reliability of the power supply.

A multifunctional panel with graphics, TFT true color displays

DVR multifunctional panel is equipped with an 8-inch graphics TFT display. With a graphical display and interface-friendly menu operating system, users can easily browse input, output, load, and run parameters.

Total maintenance-free, low operating costs

High reliability, no breakable parts, minimal self-consumption, and 20 20-year design life of energy storage devices.

No cooling equipment required

Self-consumption is only 0.8% without a forced cooling heat dissipation system.

Applications

Industrial Plants

Heavy Industries: Steel mills, aluminum smelters, chemical plants.

Manufacturing: Semiconductor manufacturing, automobile production, textile factories.

Commercial buildings

Office Complexes: Maintains stable power supply for office equipment and computer networks.

Shopping Centers: Ensures reliable operation of lighting, HVAC systems and electronic devices.

Renewable energy systems

Wind Farms: Compensates for voltage drops caused by fluctuations in wind speed.

Solar Power Plants: Stabilizes voltage variations caused by intermittent solar power generation.

Public services and energy distribution

Substations: Provide voltage regulation and support during faults and disturbances.

Distribution Networks: Ensures stable voltage levels for end consumers.

Data centers

Server Rooms: Protect servers and data storage devices from power outages and interruptions.

Network Operations Centers: Ensure reliable operation of network equipment.

Sanitary facilities

Hospitals: Maintains power quality for critical medical equipment and systems.

Diagnostic Laboratories: Protects sensitive diagnostic devices from voltage disturbances.

Other Services

All of our machines will be fully checked by our quality control department before the shipment. We guarantee all of our have a one-year warranty (quick-wear parts not included).

Training details: Operation principles, system, and structure, safety and maintenance, software processing technique, etc.

Numerous feedback from our clients have proven that our machines are stable in performance with rare malfunction.However, we would like to handle it as follows once malfunction occurs:

We guarantee that we will give you a clear reply within 24 hours.

Customer service staff will assist you in analyzing the malfunction to locate the cause.

If the malfunction is caused by improper operation of software and other soft faults, we will help solve the problem online.

We will offer plenty of online support, like detailed technical and installation instructions via email, video, and telephone.

Certifications

Package & Delivery

1. Package: Standard export package or Custom

2. Delivery: By air express, by sea

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FAQ

Q: What is a Dynamic Voltage Restorer (DVR)?

A: A Dynamic Voltage Restorer is a power quality device designed to protect sensitive equipment by compensating for voltage sags, swells, and short interruptions in real time.

Q: How does a DVR work?

A: DVR injects a controlled voltage into the supply line through a series transformer, restoring the load-side voltage to the required level during disturbances.

Q: What types of power disturbances can a DVR handle?

A: DVR effectively mitigates voltage sags, swells, short-duration interruptions, and transient disturbances that may affect sensitive loads.

Q: What is the typical response time of a DVR system?

A: DVR systems typically respond within 1–10 milliseconds, ensuring minimal impact on connected equipment.

Q: What industries benefit most from DVR solutions?

A: DVR is widely used in semiconductor manufacturing, data centers, healthcare facilities, industrial automation, and other environments requiring high power reliability.

Q: Can DVR protect against complete power outages?

A: DVR is primarily designed for short-duration voltage disturbances. For long-term outages, it is usually combined with UPS or backup power systems.

Q: What voltage levels are supported by DVR systems?

A: DVR solutions are available for low-voltage and medium-voltage systems, depending on application requirements.

Q: Does DVR affect system efficiency?

A: DVR operates with high efficiency (typically above 95%), with minimal impact on overall system energy consumption.

Q: Can DVR operate under harmonic distortion conditions?

A: Yes, modern DVR systems are designed to function reliably even in environments with significant harmonic distortion.

Q: What installation options are available for DVR?

A: DVR systems are typically installed as floor-standing cabinets and can be integrated into existing power distribution systems.

Q: What communication interfaces are supported?

A: Common communication options include RS485 and Modbus, allowing integration with SCADA and building management systems.

Q: What protection features are included in DVR systems?

A: DVR systems include protections such as overvoltage, undervoltage, overcurrent, overheating, and fault diagnostics.

Q: What maintenance is required for DVR systems?

A: DVR systems require minimal maintenance, including routine inspections, cleaning, and monitoring of cooling and control systems.

Q: Can DVR be customized for specific applications?

A: Yes, DVR systems can be tailored based on voltage level, load capacity, compensation range, and site-specific requirements.

Q: What information is needed to select a DVR system?

A: Key inputs include load type, voltage level, disturbance characteristics, required compensation depth, response time, and installation conditions.

As one of the most professional dynamic voltage restorer (dvr) manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale custom made dynamic voltage restorer (dvr) from our factory. For more information, contact us now.

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