Static Var Generator
3P3W/ 3P4W Static Var Generator
What is the significance of reactive power compensation?
Reactive power compensation is designed to reduce the flow of reactive currents in an electrical grid. This is achieved by synchronizing the phase of the fundamental voltage and current harmonics and eliminating higher harmonics in the load current, regardless of the power supply shape. This synchronization helps minimize both the current and apparent power drawn from the source while maintaining the specified active power of the load. There are various interpretations of reactive power, but in many industrial settings, partial compensation is common. This involves adjusting the fundamental voltage and current harmonics to keep the power factor within a specified range. For reactive power generation, equipment like capacitors, Static Var Generators (SVGs), and both unloaded and underloaded synchronous motors or generators are used. Passive harmonic filters are also employed to eliminate selected harmonics and correct the power factor (tgφ).
Capacitive reactive power
Inductive reactive power
Non-compliance with the set technical parameters of power consumption at connection points to the utility grid can result in additional charges from electricity providers. To avoid these charges, it is crucial to compensate for the reactive power consumed from the supply grid at each point of delivery.
The benefits of reactive power compensation
● It allows for higher active power transmission at the same nominal current of power lines, or maintains the same active power transmission with a reduced line current.
● It enhances voltage stability by reducing voltage drops across the grid.
● It decreases energy losses that occur due to reactive current flows.
● It limits voltage variations in the grid, reducing the likelihood of equipment failures.
● It enhances the overall reliability and reserve conditions of the power supply.
The economic benefits of reactive power compensation are also significant:
● It reduces the fees associated with the active energy used to compensate for transmission losses due to reactive power.
● It avoids additional charges incurred from non-optimal reactive power consumption, such as using electricity with a power factor (tgφ) beyond the contracted limit, consuming inductive reactive power without active power, or consuming active power with a capacitive power factor.
In industrial settings where active and reactive power demands vary according to the production cycle, an automatic, real-time reactive power compensation system that can independently adjust each supply point is ideal. This system utilizes available reactive power sources within the internal power grid to perform this function.
Product Introduction
Static Var Generator (SVG) is an advanced power electronic device mainly used to improve the power quality of low-voltage distribution systems. SVG technology allows systems to dynamically and quickly generate or absorb reactive power, thereby compensating for real-time fluctuations in reactive current in the power grid, optimizing power factor, reducing line losses, and stabilizing voltage levels.
Technical Specifications
| Operating voltage | 400V*±15% |
| Operating frequency | 50Hz±2.5 |
| Main circuit structure | 3p3w/3p4w |
| Rated capacity(Module) | 30kvar, 50kvar,75kvar, 100kvar |
| Circuit topology | Three-level structure |
| Multi devices in parallel | Up to 12 sets can be connected in parallel |
| Response time | ≤5ms |
| Efficiency of single machine | ≥98% |
| Working mode | reactive power compensation, three-phase load unbalance compensation. |
| Current limit | The compensating current is automatically limited within the rated current range. |
| Compensation effect (At sufficient capacity) | Reactive power factor ≥0.99; Three-phase unbalance degree≤ 5%; |
| Display Interface | External 7” HMI or built-in HMI |
| Display status | Displayed in a data mode |
| Operations | Manual start, automatic start |
| Communication | RS485, Modbus communication protocol |
| Environment temperature | -20 ~ 55 ℃ (rated power output) |
| Storage temperature | -30～70℃ |
| Relative humidity | 95 % at a maximum, no condensation |
| Altitude | Below 1500 meters above sea level |
| Cooling requirements | Require well ventilation, and the air vent can be opened through the cabinet door, or a fan installed in the cabinet. |
Application scope
1. Low voltage SVG products are commonly used in industrial sites, commercial buildings, new energy generation and other fields, such as wind power generation, photovoltaic power generation grid connected systems, as well as in situations that require precise control of voltage and harmonics.
Industrial load compensation:
In heavy industries such as steel, chemical, and mining, nonlinear loads such as large electric motors and arc furnaces can generate a large amount of harmonics and lead to a decrease in power factor. LV-SVG can dynamically provide or absorb reactive power, effectively compensate for the reactive power demand of the load, and eliminate harmonic currents, thereby improving the power factor to close to 1, reducing line losses and fines.
Distributed power generation system:
When renewable energy sources such as distributed photovoltaics and wind power are connected to low-voltage distribution networks, SVG can adjust the output reactive power in real-time to ensure voltage stability and solve the power quality problems caused by the instability of new energy generation.
Data center power guarantee:
Data center power guarantee:
The data center contains a large number of computer servers and other IT equipment, which have extremely high requirements for power quality and frequent load changes. LV-SVG is used to ensure voltage stability, suppress transient voltage drops, and recover too quickly, improving system reliability and operational efficiency.
Electric vehicle charging station:
Electric vehicle fast charging stations have a significant impact on the power grid, especially on the low-voltage side, which may cause voltage fluctuations and flicker. By deploying LV-SVG, dynamic reactive power compensation and active filtering can be carried out during the charging process to protect the power grid from being affected.