The air-cooled and water-cooled reactors and distribution transformers designed and produced by Huaxing Electric are widely used in doubly fed and direct drive wind power converter systems, widely used in the industry, and recognized by many well-known customers at home and abroad. 

As a kind of clean and renewable energy, wind energy is paid more and more attention by all countries in the world. China is rich in wind energy resources. In recent years, national policies have also vigorously supported the wind power industry. 

The wind power converter adopts three-phase voltage type AC-DC-AC bidirectional converter technology, the core control adopts "double DSP full digital controller" with fast floating-point operation ability; the stator field oriented vector control strategy is realized in the rotor side converter of the generator, and the grid voltage oriented vector control strategy is realized in the grid side converter; the system has adjustable input and output power factors Automatic soft grid connection and maximum power point tracking control function. The power module adopts IGBT power device with high switching frequency to ensure good output waveform.

Wahhing has successfully customized magnetic devices and components such as dry-type transformer, iron core reactor, shell type air core reactor, air core reactor, high-power high-frequency transformer, high-frequency inductor, etc. for the rail transit industry, and has been successfully applied in the auxiliary converter system and charger system of electric locomotive traction, subway, LRV (low floor light rail car), etc. 

 The converter set in the main traction circuit on electric locomotive and other locomotives installed with electric drive device. The function of traction converter is to convert the electric energy between DC system and AC system, and to control and adjust various traction motors, so as to control the operation of locomotive. 

 The main functional units include AC DC rectifier, DC DC converter, DC AC converter, charger, etc., which are mainly applied to DC electric locomotive, EMU, Metro, LRV (light rail) vehicles.

Wahhing provides high frequency inductors / reactors for the drive and power system of new energy / electric vehicles. 

 The motor drive control system of the new energy / electric vehicle is the main executive structure of the new energy vehicle. Its driving characteristics determine the main performance indicators of the vehicle, and it is an important part of the electric vehicle. The motor drive system is mainly composed of motor, power converter, controller, various detection sensors and power supply. 

 The driving system of a typical electric vehicle, which is powered by battery to the inverter, usually has a gearbox to drive the whole vehicle. The control system with sensors and controllers are now developing into digital motors, but there are not many changes. The main function of the driving system is to change the electrical energy into mechanical energy and transfer the energy to the wheels to drive the vehicle.

The battery charger generally adopts the imported power module, which is a relatively new electronic circuit intelligent automatic charger. Low loss and high efficiency. It is suitable for 12V and 24V battery charging. The charger also has anti reverse connection function. If it is not connected or polarity reverse connection, there is no voltage output. It can work normally only if it is connected correctly, and it also has over-voltage, over-current, overheating and other protection.

Medical device manufacturers have unique challenges when selecting their power supply partner, driven by market demands and legislation affecting both clinical and home-care environments. Wah Hing’ medical power products are designed with an understanding of those requirements, resulting in cost-effective solutions that incorporate the most sought after features such as EN60601-1 3rd Edition compliance, Class II approvals to address the growing home health care market, and small form factors.

We provide high-quality reactors and inductors for power quality fields such as PFC "Power Factor Correction" and APF “Active Power Filters”.

The ideal electric energy should be a perfectly symmetrical sine wave. Some factors may cause the waveform to deviate from the symmetrical sine, which results in power quality problems. Power quality problem can be defined as: the deviation of voltage, current or frequency that leads to the failure or abnormal operation of electric equipment, including frequency deviation, voltage deviation, voltage fluctuation and flicker, three-phase imbalance, instantaneous or transient overvoltage, waveform distortion (harmonic), voltage sag, interruption, temporary rise and power supply continuity. 

 In modern power system, the voltage waveform distortion caused by voltage sag, voltage sag and short-time interruption has become the most important power quality problem. 

 Improvement measures :

 (1) Improve the power factor to balance the reactive power locally. 

 (2) Reasonable selection of power supply radius . 

(3) Reasonable selection of conductor section of power supply system line.

 (4) The transformer and distribution equipment shall be reasonably configured to prevent overload operation.

 (5) Proper selection of voltage regulation measures, such as series compensation, transformer with on load voltage regulation device, installation of synchronous camera or electrostatic capacitor, etc.

Wahhing customized special dry-type transformer, rectifier phase-shifting transformer and reactor for the inverter system, mainly used in the rectifier unit and inverter unit inside the inverter, and the products provided are applied in standard general-purpose inverter, engineering transmission medium voltage inverter and high-voltage inverter. 

 Variable frequency drive (VFD) is a kind of power control equipment which uses frequency conversion technology and microelectronics technology to control AC motor by changing the frequency of motor working power supply. The frequency converter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), braking unit, driving unit, detection unit micro processing unit, etc. The frequency converter adjusts the voltage and frequency of the output power supply by the internal IGBT disconnection, and provides the power supply voltage required according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation. In addition, the frequency converter has many protection functions, such as overcurrent, overvoltage, overload protection, etc. With the continuous improvement of industrial automation, frequency converter has been widely used. 

 The inverter is usually divided into four parts: rectifier unit, high capacity capacitor, inverter and controller. 

Rectifier unit: convert the alternating current with fixed working frequency into direct current.

 High capacity capacitor: store the converted electric energy.

 Inverter: electronic switch composed of high-power switching transistor array, converts DC into square wave with different frequency, width and amplitude. 

 Controller: operate according to the set program, control the amplitude and pulse width of the output square wave, make the superimposition of the sine wave AC, drive the AC motor.