TXAPF (Active Filter) detects the grid current or load current in real time through the external transformer CT. The controller extracts the fundamental current and harmonic current of the load through fast Fourier transform, and obtains active, reactive, negative sequence, etc. through DQ rotation coordinates. The data is then injected into the grid by the IGBT power converter to generate a compensation current that is equal in phase to the compensation target (harmonic, reactive, unbalanced), and the power quality improvement function on the grid side is realized.

1. modular
      Each module unit of APF(Active Filter) operates independently, without the need for a central controller. Any module automatically exits after a fault, and the remaining modules automatically assume the load at rated current, and the whole machine continues to run. Convenient for the daily operation and maintenance of the user

      According to the N+1 redundancy theory, the reliability is increased by an order of magnitude for each redundant level of equipment. The modular structure is especially suitable for users who require high power quality.

2. strong anti-pollution ability
      All conductive components except the fan are isolated from the outside world, and are suitable for harsh occasions with serious dust, salt, alkali and humidity. The internal structure of the module is as follows:

3. minimalist on-site installation
      The user can choose to wear the busbar cable or the cable cable underneath. The load side or grid side can be selected as the external current CT sampling point.

4. the combination is unlimited
      APF, SVG, and C can be arbitrarily matched with different types of modules to achieve rich functions. APF/SVG can also be used with third-party capacitor compensation, for example, 150A APF+50A APF+50kvar SVG+100kvar C. Moreover, regardless of the form of third-party capacitor compensation or passive filtering, TXAPF can achieve resonance without ensuring safe and reliable operation of the overall grid system.
The principle of collocation and the functions realized can be found in the more economical compensation scheme of IV.

5. high power density
      The modular design of the TXAPF series APF/SVG can accommodate 600 wide cabinets, 600 deep cabinets, 600 wide * 600 deep cabinets and larger cabinets. The power of the whole machine can reach 900A/600kvar, while the industry The mainstream indicator is > 600A/400kvar. Higher power density saves users space and costs.
      For SVG, the rated output power is calculated according to the fully compensated reactive power. It can also compensate the single-phase load current with full power, maintain the three-phase current balance on the grid side, and compensate the low-order harmonics within 13 times with a maximum of half of the power. The remaining power is used for reactive power compensation, total output power:

6. low loss
      Thanks to a deep understanding of power electronic high-speed switching devices, TXAPF series APF/SVG has a working loss of >2.5% at full load, while the industry mainstream index is >3% to 4%. Active loss is critical to the large-scale application of SVG in the national grid!

7. very quiet noise
       TXAPF series APF/SVG uses high-quality soft magnetic reactors and scientific air duct design. The full-scale working noise of the whole machine does not exceed 60dB, while the mainstream indicator of the industry is >70dB. Silencing is critical to the user's best experience with the product!

8. very high current loop bandwidth
       TXAPF achieves quasi-natural sampling and continuous control. The equivalent switching frequency reaches 80kHz, the current loop bandwidth reaches 4kHz, and the suppression speed of interference reaches more than 4 times that of other products in the same industry. The mainstream indicators of the industry are 20kHz/1kHz. The device has a higher current loop bandwidth, so the protection will be more timely, and it will remain stable in extremely harsh situations, and can achieve parallel with pure capacitance without resonance.

Note 1: For intermediate modules, the appropriate size can be selected according to the width of the cabinet.

Note 2: The height of the cabinet is 2200mm by default. TXAPF's（Active Filter） each module in the cabinet is equipped with a circuit breaker by default, so that the power can be expanded afterwards.