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AC Dynamic Voltage Restorer (KS-DVR)

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The KS-DVR employs power electronics technology; when the system voltage experiences a sudden dip, the device can rapidly regulate the voltage, while also mitigating three-phase voltage imbalance and correcting voltage deviations. This ensures seamless transition of the output voltage to its rated value, thereby guaranteeing normal and stable operation of the load.

key word:

Intelligent Control Device

Hotline:

400-0571-505

Online consulting

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Detailed introduction

Graphic details

Product Overview

Working principle

The KS‑DVR is connected in series between the power supply and the protected load. It continuously monitors the input-side supply voltage, and when it detects that the supply voltage deviates from its rated level, the device uses an IGBT inverter system to generate a compensating voltage and inject it into the system, thereby maintaining stable output‑side (load‑side) voltage and ensuring that the protected load remains unaffected by voltage fluctuations.

Grid voltage within limits: When the grid supplies power to the load (in online mode), the inverter remains in sleep mode but stays synchronized with the grid voltage, enabling it to respond immediately to grid disturbances.

Voltage sag occurrence: When a disturbance occurs in the power grid, the bidirectional thyristors rapidly turn off, thereby isolating the system from the grid and enabling the inverter to supply power to the load.

Voltage stabilizes again: the KS-DVR’s anti‑parallel thyristors turn on, the inverter circuit shuts off, and the load is once more supplied by the utility grid, while the rectifier circuit resumes charging the energy‑storage capacitor.

Fail-safe bypass operation: In the event of a KS-DVR failure or during maintenance, the load current is automatically diverted to the fail-safe bypass. Specifically, the current flows through a contactor or bypass switch connected in parallel with the dual reverse‑connected thyristors, supplying power directly to the load.

Product Advantages

● High reliability, specifically designed for industrial loads
Multi-level protection, simple circuitry, high reliability, and maintenance-free.
● High system efficiency and fast response speed
Efficiency as high as 99.2%; protection switching time no greater than 2 ms; capable of handling single-phase, two-phase, and three-phase voltage dips down to 0%.
● Superior rectifier performance with no harmonic injection
Employing fourth-generation insulated-gate bipolar transistor (IGBT) power devices and multiple protection technologies ensures the equipment’s utmost reliability. Advanced IGBT green rectification technology eliminates harmonic injection pollution, thereby enhancing energy efficiency.
● All-digital control technology based on DSP, with high reliability.
Employing a state-of-the-art 32-bit DSP (digital signal processor), the KS-DVR achieves exceptionally high performance and reliability through advanced, flexible logic algorithms.
● Advanced parallel scalability and modular design
The parallel expansion feature not only increases the capacity of the KS‑DVR system but also provides mutual redundancy, further enhancing power supply reliability.
● Multifunctional panel with a graphical TFT true-color display
The KS-DVR’s multifunction panel is equipped with an 8‑channel graphical TFT display. Thanks to its graphical interface and user‑friendly menu system, users can easily navigate input, output, load, and operating parameters.
● Completely maintenance-free, with low operating costs
The energy storage device boasts high reliability, contains no vulnerable components, exhibits extremely low self‑discharge, and is designed for a service life of 20 years.
● No cooling equipment required
Self-consumption is only 0.8%, eliminating the need for a forced‑cooling heat‑dissipation system.
● Compact structural design with a small footprint
The compact structural design significantly reduces requirements for installation space and floor load capacity, helping users save space and lower capital investment; its footprint is only one‑half to one‑third that of a conventional UPS.

Comprehensive benefits

● By providing protection against voltage sags and swells, it prevents severe downtime-related losses, avoids raw material waste, and safeguards production equipment from damage.
● Avoid using substandard power with your equipment, reduce factory maintenance costs, and safeguard product quality.
● Prevent accidents caused by data and control system malfunctions resulting from voltage sags.
● Compared with traditional online UPS systems, the KS-DVR device consumes only one‑tenth of the power, significantly reducing users’ electricity costs.
● It significantly reduces users’ costs for maintenance and battery replacement, while eliminating the need to dispose of spent batteries and preventing environmental pollution.
● Extremely high operational efficiency; the equipment generates no heat, eliminating the need for air-conditioning or other cooling systems, thereby reducing both capital expenditures and operating costs associated with air conditioning.
● No harmonic injection into the grid, eliminating the need for additional filtering equipment typically required by conventional UPS systems.

Technical Specifications of the 400V Series KS-DVR

Main Technical Parameters Table

Specifications

DVR04-30

DVR04-50

DVR04-75

DVR04-100

DVR04-150

DVR04-300

DVR04-500

DVR04-750

DVR04-1000

DVR04-1250

DVR04-1500

DVR04-2000

Rated Capacity (S)

30KVA

50KVA

75KVA

100kVA

150VA

300KVA

500kVA

750KVA

100KVA

1250KkVA

1500KVA

2000KVA

Rated Voltage (Un)

400V±15%

Current (ln)

43A

72A

108A

144A

216A

432A

720A

1080A

1440A

1800A

2160A

2880A

Host + Bypass Dimensions/mm

(W×DxH)

700*800*2100

800*800 *2100

900*800 *2100

1600*800*2200

1900*800 *2200

2400*1000*2200

3300*1000 *2200

Energy storage dimensions/mm

(W×DxH)

(Within 0.45 of regular time)

600+80*200

600*100*200

Minimum residual voltage (min)

Duration (Tr)

0.4–30 s, others customizable

Protection against consecutive voltage sags

Can do.

Operating Humidity (RH)

<95%, no condensation

Operating Altitude (H)

0–3000 m (>2000 m, derate by 1% for every 100 m increase)

Ingress Protection Rating (IP)

IP21 or IP23; other protection ratings are available.

IEC Pollution Degree (IEC)

Display

8-inch graphical TFT true-color display

Smart Communication

Modbus/TCP, Ethernet/485/GPRS

Grid input

Energy storage device

Operating frequency

50/60Hz ±10%

Energy storage component

Supercapacitor/Electrolytic Capacitor

Overvoltage level

III

Overload capacity

200%

Overload capacity

150%, maintained for 60 seconds; 500%, maintained for 1 second; 2000%, maintained for 20 milliseconds.

Recharging time

<45s(Supercapacitor)

Efficiency

99.2%

Design life

>20 years (25°C)

Load Output

Fail-safe bypass

Rated apparent power (S)

300~3000 kVA

Overload capacity

500%30s

Phase shift of the connected load, power factor (PF)

0.5 lagging to 0.9 leading

When the contactor is closed

20ms

Maximum allowable motor load

50% of the DVR’s rated capacity; custom options available for usage exceeding 50%.

When the circuit breaker is closed

80 ms (optional)

Rated apparent power (S)

300~3000 kVA

Cooling method

Natural convection/forced air cooling

Inverter power supply

Incident Record

Voltage setting time

1~5ms

Measurement method

Line voltage

Response time

<1ms

Testing cycle

50u

Output frequency

50/60Hz±1%

Event log time resolution

10ms

Voltage distortion (THDu)

Under linear load conditions, THDu < 2.5%

Measurement Type

Half-cycle RMS as specified in IEC 61000-4-30

Voltage imbalance

Less than 3% under 100% unbalanced load conditions

Cabinet

Protective current

200%

Materials

Galvanized steel

none

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