The association between APF (Active Power Filter) and SVG (Static Var Generator)

In the field of power quality management, APF (Active Power Filter) and SVG (Static Var Generator) are two core power electronic devices that jointly form the technical system for dynamic compensation in modern power systems. With the increasing complexity of industrial electrical equipment and the increasingly strict requirements for power quality in the power grid, enterprises and users related to APF and SVG need to have a clear understanding of their interrelationships.

I. Complementarity of Technical Principles

1. The APF active filter and SVG functionally complement each other perfectly. The APF active filter is based on the instantaneous reactive power theory. By detecting the harmonic current of the load and generating reverse compensation current, it achieves harmonic filtering. Its typical harmonic suppression rate can reach over 97%.
2. SVG achieves dynamic reactive power compensation by adjusting the phase and amplitude of the output voltage, and the response time can be controlled within 10 milliseconds.

II. Similarity of Hardware Architecture

From the perspective of hardware composition, the APF active filter and the SVG (Static Var Generator) have highly similar topological structures. Both adopt a voltage source type inverter as the core, and include key components such as DC support capacitors, IGBT modules, and filtering inductors.

III. The Integration Trend of Control Systems

The modern power quality management system is promoting the deep integration of APF (Active Power Filter) and SVG (Static Var Generator) control.

IV. Collaborative Strategies for Application Scenarios

Based on the characteristics of power quality issues, the collaborative strategy between the active power filter (APF) and the static var generator (SVG) should be adapted to local conditions:

1. Harmonic-dominant type (THD > 20%): Mainly using APF (Active Power Filter) for filtering.
2. Reactive power deficit type (PF < 0.8): Focus on the application of SVG
3. Comprehensive issue: Implement a mixed compensation plan

By fully leveraging the synergy between APF (Active Power Filter) and SVG (Static Var Compensator), not only can the governance effect be enhanced, but also higher economic efficiency and reliability can be achieved, providing strong support for the construction of smart grids.