This article will explore in depth the role of SVG in photovoltaic power plants, especially how to optimize plant performance and economic benefits by improving power factor and reducing losses.

1.What is SVG?

SVG (Static var generator) is an advanced reactive power compensation device, its main working principle is to use power electronics technology to quickly and accurately provide reactive power to improve power quality. The following details the working principle of SVG, application scenarios and its advantages over traditional reactive power compensation devices.

operating principle

SVG logic principle and wiring diagram

SVG uses a power electronic converter (such as IGBT) to control the reactor connected to the AC side, and adjusts the reactive power output of the reactor in real time according to the real-time reactive power demand of the load, so as to achieve the purpose of compensating the reactive power of the system. SVG can quickly respond to changes in the reactive load of the grid and compensate reactive power almost in real time.

application scenarios

SVG is often used in the following scenarios:

Industrial enterprises: especially in industries with high power quality requirements, such as semiconductors, precision manufacturing, etc.
Data center: Ensure stable power supply in the data center and protect sensitive IT equipment.
Renewable energy: such as wind and solar farms, improve the quality of grid access.
Public power grid: provides reactive power regulation to optimize power quality.
Commercial buildings: large shopping malls, office buildings, etc., improve energy efficiency and stability of the power system.

 Compared to traditional reactive power compensation devices, such as a combination of capacitors and reactors, SVG has the following advantages:

Fast response: SVG can respond to changes in reactive power in milliseconds, while traditional devices respond more slowly.
Continuous adjustment: SVG can achieve continuous adjustment of reactive power, not limited by step changes.
Two-way regulation: SVG can not only provide reactive power, but also absorb the excess reactive power of the grid.
Adaptability to harmonics: SVG can suppress system harmonics and improve power quality, while traditional devices may require additional harmonic control facilities.

No overload protection: SVG does not need overload protection due to excessive reactive power when working, and is relatively more stable and reliable.
Small footprint: Because SVG is based on power electronics technology, its volume is smaller than traditional equipment, and installation is more flexible and convenient.
Low maintenance costs: SVG, due to its semiconductor devices and simple control, has lower maintenance costs than traditional reactive power compensation devices that require regular maintenance.

2. How does SVG improve power factor?

Power factor is an important index to measure power quality, which is directly related to the utilization efficiency of power and the operating cost of power system. In photovoltaic power stations, because the output power of photovoltaic arrays shows fluctuations, this fluctuation not only includes changes in active power, but also accompanied by changes in reactive power. SVG can detect the voltage and current state of the power grid in real time, and quickly compensate the reactive power, so that the power factor of the power station is close to 1, that is, to achieve "unit power factor", which can maximize the transmission of effective power.

3.  How can SVG reduce losses?

When reactive power is present in the power system, the current will increase, resulting in more line losses and equipment heat losses. SVG reduces the current level in the system by effectively controlling reactive power, thus reducing loss. In addition, the dynamic adjustment ability of SVG also means that it can quickly compensate the corresponding reactive power when the photovoltaic output fluctuates, maintaining the stability of the grid, reducing energy loss, and improving the economic efficiency of the entire power system.

4.epilogue

As an efficient reactive power compensation technology, SVG is a key tool to improve the grid-connected performance of photovoltaic power stations, reduce system losses and improve power quality. With the continuous maturity of the photovoltaic industry and the continuous improvement of power grid requirements, the application of SVG will be more and more extensive, which is of great significance to promote the development of photovoltaic power stations, especially large-scale photovoltaic power stations. For operators of power systems and investors of photovoltaic power plants, understanding and correctly applying SVG technology will help improve the economic and technical benefits of photovoltaic projects and realize the efficient use of green energy.