IGBT Static Automatic Voltage Stabilizer

WPZ IGBT Static Voltage Stabilizer Overview

The Winzele WPZ series is an IGBT-based static voltage stabilizer designed for critical equipment and processes requiring precise voltage regulation, stable frequency and fast dynamic response. Its AC–DC–AC architecture supplies controlled AC output within the specified input operating range, helping sensitive equipment operate under fluctuating supply conditions.

Typical applications include precision manufacturing, medical electronic equipment testing, aviation equipment and installations supplied by small hydropower systems or remote distribution networks. Each configuration is selected according to the actual supply conditions, load characteristics and required output performance.

The WPZ series can be configured for different input and output voltage ratings, covering worldwide 50 Hz and 60 Hz power systems and 400 Hz aviation power applications. Its primary purpose is to maintain a stable supply for the connected equipment. Voltage and frequency adaptation are available where the site supply and equipment requirements differ.

Real-World Application

200kVA IGBT Stabilizer for Precision Electronics Factory in Vietnam

WINZPOWER manufactured and supplied a 200kVA WPZ33200 IGBT Static Automatic Voltage Stabilizer for DONGKWANG COMPANY LIMITED’s precision electronics facility in Vietnam. The system was selected to provide a stable 380V / 50Hz supply where the site grid showed both voltage fluctuation and frequency deviation.

Input:380V±20%, 47–63Hz→Output:380V±1%, 50Hz

View Project Details →

How the WPZ Voltage and Frequency Stabilizer Works

The WPZ series uses an AC–DC–AC power conversion process. Incoming AC power is rectified to a DC link, then an IGBT inverter generates an AC output controlled to the required voltage and frequency.

AC Input → Rectifier → DC Link → IGBT Inverter → Regulated AC Output

1. AC–DC Rectification

The input rectifier converts incoming AC power into DC power. The rectifier configuration and input ratings are selected to match the project’s supply voltage, frequency and capacity requirements.

2. DC-Link Energy Buffering

DC-link capacitors smooth the DC bus voltage and provide a short-term energy buffer between the rectifier and inverter. Working together with the inverter control system, this buffering supports rapid output regulation during input disturbances.

3. IGBT Inversion and Output Regulation

The inverter uses pulse-width modulation to generate the required AC output. Closed-loop voltage and current control adjusts inverter operation to maintain the specified output voltage, while frequency control maintains the selected output frequency within its stated tolerance.

The WPZ series specifies a 2 ms dynamic response to input-voltage changes under the applicable test conditions. This response-time specification is distinct from the time required for the output to settle within its stated voltage tolerance.

4. Output Isolation Transformer

The inverter supplies the load through a dedicated output isolation transformer. This transformer provides galvanic isolation and forms part of the configured output voltage arrangement. Its voltage ratio, capacity and operating frequency are matched to the selected WPZ configuration, including 50 Hz, 60 Hz or 400 Hz applications.

5. Input Harmonic Management

Rectifier selection also affects the harmonic current drawn from the supply. Depending on project requirements, the standard 6-pulse arrangement can be replaced with a 12-pulse or 18-pulse configuration. Active rectification and filtering options are also available. These options address input-side harmonic performance, which is specified separately from output voltage waveform distortion.

WPZ Control Principle Diagram

WPZ AC–DC–AC Power Circuit Topology

Inside the WPZ IGBT Static Voltage Stabilizer

The WPZ series is built around a rectifier, an IGBT inverter and an output isolation transformer, housed in a steel cabinet with front-panel controls and metering. The photographs below show these assemblies inside WPZ cabinets during production and final assembly.

WPZ Technical Specifications

Input Specifications

Output & Regulation Performance

Control & Communication

Display & Monitoring

Protection

List of  WPZ Power Models & Products

1.Three-phase Model List

Small Capacity (3-30 kVA)

Medium Capacity (45-200 kVA)

Large Capacity (250-800 kVA)

Extra-Large Capacity (1000-1800 kVA)

Notice:

1. For 90kVA and below, use high and low voltage switch. For 90kVA and above, choose one of the high and low voltage when ordering;

2. The current in the table is calculated when the line voltage is 380V. The actual use should be calculated according to the highest voltage of the selected equipment;

2.Single-phase Model List

Small Capacity (0.5-30 kVA)

Medium Capacity (45-300 kVA)

Manufacturing Capability

Winzele manufactures the WPZ series in its own production facility. Cabinet assembly, electrical wiring, component integration and final configuration are carried out in-house, so each unit can be built to the customer’s specified input voltage, output voltage, output frequency and capacity.

Factory Acceptance Testing

Every WPZ unit is assembled, wired and tested at the factory before shipment. Tests cover the ordered configuration, including inductive load conditions, and the control panel readings are checked against the specified output voltage and frequency.

Application

1. Railway, aviation, and navigation systems;

2. Precision testing of medical electronic equipment;

3. Power supply for imported electronic and electrical equipment;

4. Testing of exported electronic and electrical products;

5. CNC machine tools, light industry and textiles, and automated production lines;

6. Generator-powered facilities requiring stable voltage and frequency.