| With the increasing dependence on electricity, how to save energy is of great significance. The industrial processes consume huge quantities of electrical energy, and there is a seriously waste of power, while the more noteworthy aspect is the waste of energy produced by the motor speed process. Frequency control technology used in the actual industrial production process is one of the effective ways to save energy and improve the production-efficiency. Due to control performance, there is also a serious energy waste in the frequency control system, how to effectively use the excess energy in the frequency control process is critical, especially in the energy-crisis modern time. As the supporting device in a frequency control system, the energy feedback device has the ability to use the excess energy generated by the motor in the power generation state effectively. Traditional inverters usually use up the excess energy produced by the motor brake by setting resistor in series in the DC side. Although this method is simple and easy to implement, there are shortcomings and deficiencies such as a waste of energy, the heated resistance affecting the work of other devices and ambient temperature. This article adopts a high frequency inverter technology, that is employing three-phase inverter in the middle DC link of the inverter, the inverter output side connects to the grid through the choke reactor in order to achieve effectively use of the excess energy.Firstly, these papers explains the significance and background of the research of the energy feedback device, makes a brief introduction on the research status, development of dynamic and market prospects of the energy feedback device in current domestic and international, and then emphatically discusses the following several aspects.1) This design creates mathematical model of the energy feedback device topology, discusses the principle of the three-phase full controlled devices structure energy feedback device, and gives the double closed-loop control structure figure based on voltage outer loop and current inner loop according to this mathematical model.2) This design is analyzed the working principle of SVPWM modulation, and then simulated the SVPWM modulation algorithm by modular method with the Matlab/Simulink software, and then simulated and anglicizing the three-phase inverter bridge based on SVPWM modulation. This paper introduces the basic principle of PID algorithm, making the best control strategy by comparing the position type and incremental PID control algorithm. In the simulation under the premise of success, with DSPF2812as control core, SVPWM modulation algorithm is given software realization of the specific process.3) In this design, the selection of the main circuit devices of energy feedback device are analyzed in detail, and then designed the hardware circuit by modular type way, including DC bus voltage measure circuit, the measure circuit of the output side of the inverter, synchronous circuit, temperature detection circuit, IGBT drive circuit, liquid crystal display interface circuit and communication interface circuit, etc, and making PCB board on each circuit module respectively.4) In this design, the experiment test for each circuit function module have been done, and building experimental platform with TMS320F2812(DSP) as the core to control the system after debug successfully, and producing a prototype, and then doing test entirely and gives the experimental waveform. The successful development of this energy feedback device has very important practical significance for saving energy and reducing consumption, and realizing the precise brake and four quadrant operation for motor, and also has broad application prospect in the market. |
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