ANAPF active filter modular installation advantages

This paper introduces the characteristics of the modular design of the ANAPF active filter, and introduces the installation instructions of the drawer type APF module in the cabinet in combination with the practical application, and the way of wall-mounted APF module wall mounting, which embodies the modular design in the installation. Advantages in after-sales maintenance, expansion, etc., while saving costs for users

Yang Junjun

Abstract: This paper introduces the characteristics of the modular design of ANAPF active filter, and introduces the installation instructions of the drawer type APF module in the cabinet in combination with the practical application, and the way of wall-mounted APF module wall mounting, which embodies the modular design. The advantages of installation, after-sales maintenance, expansion, etc., while saving costs for users.



Keywords: active filter, drawer wall mount, modular features, installation advantages



Introduction: ANAPF active filter is a commonly used product for harmonic control. Most of the products on the market are cabinet-type products. The cabinet design has low production efficiency, inconvenient installation and after-sales service, and cannot be expanded. The high cost and other defects sometimes affect the customer's delivery time. This modular design solution can solve the above problems.



1. How does the ANAPF active filter work?

The ANAPF Active Power Filter (hereinafter referred to as APF) is connected in parallel to a low-voltage power distribution system with harmonic loads, enabling fast and real-time tracking and compensation of dynamically changing harmonic currents. The principle is as follows: ANAPF series active power filter collects the harmonic current of the system through CT, and quickly calculates and extracts the content of each harmonic current through the controller, generates harmonic current command, generates harmonic current series through power execution device. The compensation currents are equal in opposite directions and injected into the power system to cancel the harmonic current generated by the nonlinear load.









(The figure above shows the schematic diagram of the ANAPF active power filter)



2. Introduction of the APF module

The APF modular design is divided into two types according to the installation method: drawer type module and wall-mounted module.

2.1 drawer module:

Dimensions 485 × 610 × 275 (width * depth * height)

Rated current: 30A 50A

Rated voltage: AC380V

Wiring method: three-phase three-wire or three-phase four-wire

Incoming mode: after entering and exiting

Rated frequency: 50Hz

Module housing color: RAL9004

Protection level: IP20

Quality: 50KG

2.2 Wall-mounted module:

Dimensions 485 × 275 × 610 (width * depth * height)

Rated current: 30A 50A

Rated voltage: AC380V

Wiring method: three-phase three-wire or three-phase four-wire

Entry method: up and down

Rated frequency: 50Hz

Module housing color: RAL7035

Protection level: IP20

Quality: 50KG

The maximum capacity of a single module is 50A, which can be installed separately. The wall-mounted module is suitable for occasions with small load capacity or compact space. It can be hung directly on the wall, or the appropriate number of modules can be used according to actual capacity and cabinet size requirements. Hang in the cabinet and meet the harmonic capacity requirements of customers through parallel. The drawer type can also be installed in parallel in the cabinet to form a large current compensation device. The number of modules in the cabinet can be increased or decreased according to the actual compensation capacity requirement. It is more convenient to install than the wall-mounted module and is suitable for large load capacity occasions.



3. APF modular design features

3.1 Modular design, building block extended parallel structure, easy to install, easy to expand, can be used as a separate component.

The modular active filter is a modular parallel structure. Each electrical component in the main circuit is miniaturized and standardized. The entire topology is packaged in one module. The APF module and the cabinet are fixed by sheet metal. When the user expands, the APF is used. Insert the fiber into the APF cabinet in the reserved space.

3.2 Easy maintenance and support online maintenance

Any damage to an electrical component will only affect the operation of the current module. Other modules in the APF cabinet will operate normally and will not cause a complete set of APF defects. During maintenance, simply remove the faulty APF module from the cabinet and replace it with a new APF module.

3.3 High reliability and uniform temperature

The IGBT and LCL filter in the inverter unit are miniaturized and the power is small. The heating elements are evenly distributed to each filter module. The heat is even, and the electrical components are not easy to occur because the temperature is too high and the failure occurs. Each module is equipped with a cooling fan.

3.4 Using the optical fiber to transmit data between the controller circuit board and the APF module and the APF module

The fiber optic connection is used between the controller and the power unit, and the entire data transmission is an optical signal and is not subject to electromagnetic interference. In terms of signal degradation, fiber transmission attenuation is much smaller than traditional cable transmission.

3.5 real-time follow-up, dynamic compensation

Harmonic current detection technology based on instantaneous reactive power theory is used to monitor harmonic current in real time. Through instantaneous current tracking control, harmonic current dynamic compensation is realized, and harmonic changes of power grid are automatically tracked. It has high controllability and fast response.

3.6 Flexible compensation method

A multi-function machine can not only control harmonics, but also compensate for reactive power and improve power factor. It can compensate for a single harmonic source independently or with multiple harmonic sources.



4. Introduction to APF modular installation

APF active filter current specifications are: 50A, 100A, 150A, 200A, 250A, 300A. The maximum capacity of a single module is 50A. Example: 100A is composed of 2 modules, and so on, 300A is composed of 6 modules.

4.1 Standard APF cabinet structure (the cabinet can be customized according to customer requirements)

Cabinet profile: C profile

Cabinet size: width * depth * height 800 * 1000 * 2200 protection level: IP30

Cabinet color: RAL7035

Standard brow (figure: A): 60mm high, white on red background, front and rear brows, top of brow and cabinet top

Brow silk screen content:

The illustrations B and F are the front and rear doors of the busbar area respectively. There are two types of sealing plates and cabinet doors. The illustrations are cabinet doors. The heights are available in 180, 200 and 220. They can also be customized according to customer requirements.

C is the bottom baffle area of ​​the cabinet. The height is 100 or 120. It can also be customized according to customer requirements.

D is the busbar area, the height is 200, 250 two sizes, can also be customized according to customer requirements.

E is the ground drainage area, the standard height is 150mm, other heights will affect the cabinet stocking and module installation quantity.

The front and rear doors of the cabinet are standard front and rear doors, the width of the small door is 200mm, and the width of the door is 600mm. The front and rear doors of the cabinet need to be opened with more cooling holes for ventilation and heat dissipation.







4.2 Installation of drawer modules in the cabinet

At present, the conventional APF cabinet has limited space, and the drawer module is installed with up to six active filters with a combined capacity of 300A. However, we are researching and developing more modules and more capacity.

4.2.1 Drawer module shape and mounting hole size



Module physical view



Module physical backsight



Module mounting hole size







4.2.2 drawer module installation instructions







6 modules, 300A APF module installation diagram



● The module support brackets in the cabinet are supported by the top, bottom, left and right sides. The brackets are 1, 2, 3, 4, and 5. The brackets are placed on the inner beam of the cabinet. Each bracket has a small number of holes corresponding to the serial number, which is only used as a bracket. The difference is used, not used for installation. The four modules in the cabinet and the fixed positions of the following modules are installed from the support bracket 3, that is, the APF1 module is placed on the bracket 3, the APF2 module is placed on the bracket 4, if four modules, and so on, the APF4 module is placed in the cabinet bottom. Support beam. The APF1 module is on the support bracket 2 when the 5 modules are used. As shown in the following figure (1).

● Each APF module is placed in the corresponding position in the cabinet according to the above requirements for mounting and fixing position. The mounting hole on the front panel of the module just corresponds to the mounting hole on the mounting bracket in the cabinet, and then fastened with M6 screws, as shown below:











Figure (1)



● Each module is equipped with a miniature circuit breaker (now taking the Tianshui 213 brand miniature circuit breaker as an example) for protection and sub-cooperation for easy maintenance. The micro-breaking installation position corresponds to the position of the onboard module and is placed on the 35mm rail in the small door on the left side of the cabinet.



4.2.3 drawer type module wiring instructions







APF onboard module schematic

4.2.3.1 Primary cable wiring







Figure (2) Figure (3) Figure (4)

As shown in Figures (2) and (3), the four-phase lines A, B, C, and N on the module are respectively connected to the pile head of the miniature circuit breaker, and then the A, B, C, and N four-phase lines are from the miniature circuit breaker. The upper pile heads are respectively connected to the four busbars A, B, C and N in the cabinet, and the customer incoming lines are respectively led to the four busbars, as shown in figure (4). Complete a cable connection.

4.2.3.2 Fiber Connection

As shown in the figure (5), R1 is not connected to the APF1 module, T1 is connected to the R1 of the APF2 module, T1 of the APF2 module is connected to the R1 of the APF3 module, and so on, the T1 of the last module in the cabinet is not connected. .





Figure (5)

4.2.3.3 Transformer signal cable connection







Figure (6) Schematic diagram of external transformer

As shown in Figure (6), CT1~CT3 are external transformers. Ia*, Ib*, Ic* on the APF1 module are led to the first, second and third test terminals in the cabinet, respectively corresponding to the external transformer A. B, C phase S1, Ia, Ib, Ic on the APF1 module are respectively connected to Ia*, Ib*, Ic* on the APF2 module, and Ia, Ib, Ic on the APF2 module are respectively connected to Ia*, Ib*, Ic* on the APF3 module. By analogy, Ia, Ib, and Ic on the lowermost module in the cabinet are connected to the 4th, 5th, and 6th test terminals, respectively, corresponding to the external transformer A, B, and C phase S2 ends, as shown in the figure ( Seven) shown.







Figure (7) terminal

4.3 Description of wall-mounted module wall mounting

4.3.1 Wall-mounted module physical shape



Wall-mounted module



4.3.2 Wall Mount Module Installation Instructions







Figure (8)







Figure (9) Figure (10)

Our company provides mounting brackets, as shown in Figure (8) (9). The mounting brackets are fixed to the wall with M10 expansion bolts. The rear wall mounting holes on the module are mounted on the mounting brackets. Easy wiring and module cooling requirements.



4.3.3 Wall-mounted module wiring instructions

The active filter of Example 100A can be mounted side by side with two 50A modules.

4.3.3.1 Primary cable wiring







Figure (11)

Use 16mm2 cable to lead from the upper end of the two modules A, B, C, N to the pile head of the 4-stage molded case circuit breaker or the 3 pole plus N row.

4.3.3.2 Fiber optic wiring

As shown in Figure (11) above, R1 is not connected to APF1 module, T1 is connected to R1 on APF2 module, and APF2 module T1 is not connected.

4.3.3.3 Transformer signal cable wiring







As shown in the figure, CT1~CT3 are external transformers. Ia*, Ib*, Ic* on the APF1 module correspond to external transformers A, B, and C, respectively, and Ia, Ib, and Ic on the APF2 module respectively. External transformer A, B, C phase S2 end.



4.3.4 Example: Installation Diagram of APF100A Wall Mount Module









5. APF capacity calculation method

Harmonics are generated by nonlinear devices, and the actual operating conditions of each device are different. Therefore, the actual harmonic current needs to be measured by special equipment. Considering the technical and economical equipment, the rated harmonic compensation current of the harmonic control device should be slightly larger than the system harmonic current. Since the measurement and calculation of the harmonic current itself is complicated, it is often difficult to collect enough harmonic data in the use of electrical equipment during design. The harmonic current can be estimated according to the following formula.

5.1 Selection according to load rated current and industry type





5.2 Selection according to transformer capacity and industry type





The magnitude of the harmonic compensation current can be arranged by a professional pre-sales engineer to assist in the measurement or by self-estimation based on the transformer capacity and industry type.

Harmonic content of common harmonic loads

Load type	Typical harmonic content (%)	Load type	Typical harmonic content (%)
Frequency converter	33~50	Medium frequency induction heating power supply	30~35
elevator	15~30	Six-pulse rectifier	28~38
LED light	15~20	Twelve-pulse rectifier	10~12
Energy saving lamp	15~30	Electric welder	25~58
Electronic ballast	15~18	Inverter air conditioner	6 to 34
Switching power supply	20~30	ups	10~25

6. Conclusion:

The modular design of the active filter is light in structure and convenient to install, which saves the investment cost and shortens the production period for the user; the manufacturing tends to be standardized, and the specification changes in the production process are reduced, which is more suitable for large-volume, standardized production, and the product quality is more guaranteed. . The multi-module parallel active filter compensation method is flexible. It can be used for different capacity and required harmonic suppression occasions when different numbers of compensation modules are connected in parallel, so it is reliable in solving various industrial and commercial applications. More flexibility. It provides an efficient compensation device for harmonic control engineering of low-voltage distribution network, and has good application value and application prospect.



[References]
Ankerui Power Quality Monitoring and Governance Selection Manual. 2015.08 Edition Ankerui Electric Co., Ltd. Product Manual.2013.01.

About the Author:
Yang Junjun, female, undergraduate. Position: Now working at Ankelui Electric Co., Ltd. Tel, mobile, QQ




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