CN106953564A - A Chopper Speed Regulator with Residual Energy Feedback Function - Google Patents

Abstract

A kind of chopper speed regulating device with complementary energy feedback function, belong to electrical equipment technical field, it is made up of in structure epicyclic train, magneto alternator, chopper speed regulating device, current detection controller and host computer, the width of output waveform, which is controlled, by changing the ON time of on-off circuit controls the voltage or electric current of direct current output, compact conformation is reasonable, operation principle is clear, has the advantages that speed efficiency height, low cost, power factor (PF) height, harmonic component are small.

Description

A Chopper Speed Regulator with Residual Energy Feedback Function

technical field

The invention belongs to the technical field of electric power equipment, and relates to an electric speed regulating device, in particular to a chopper speed regulating device with a residual energy feedback function.

Background technique

There is a serious shortage of power resources in our country. In order to build an energy-saving country, it is necessary to develop new energy-saving speed regulation technology. At present, there is already a permanent magnet coupling stepless speed regulation device for high-power and high-speed motors composed of NGW planetary mechanism, permanent magnet synchronous generator and inverter grid-connected circuit. This device can overcome the large eddy current loss of the original magnetic coupler. , The waste of energy caused by the large heat generated by the conductor rotor, and at the same time, the eddy current heat energy in the magnetic coupler can be fed back to the power grid to achieve open source and cost reduction. In this device, following the principle of energy conservation, the load speed can be adjusted by adjusting the grid-connected active power generated by the generator. Therefore, it is necessary to design a speed regulating device suitable for this new energy-saving speed regulating system.

But at present, most of the speed regulation methods used in the domestic petrochemical, electric power, metallurgy, papermaking, building materials and other industries are frequency conversion speed regulation for high-power and high-speed centrifugal fans and centrifugal pumps. In view of the problems of frequency conversion speed regulators in the production and operation of power plants, especially the serious uncertainty of the failure of frequency conversion equipment, it has brought great hidden dangers to the production of enterprises, directly affecting the continuity, stability and reliability of production and operation At the same time, it also brings a large economic loss to the enterprise. This loss is usually due to the failure of electrical equipment, which prompts load shedding or untimely processing to cause downtime. Therefore, it is particularly important to develop a chopper speed control device with the function of residual energy feedback on the basis of the research on the permanent magnet coupling stepless speed control device for high-power and high-speed motors.

Contents of the invention

The purpose of the present invention is to solve the potential safety hazards in the frequency conversion speed regulation adopted by the above-mentioned high-power high-speed centrifugal fans and centrifugal pumps, which affects production and operation; while the permanent magnet coupling stepless speed regulation system for high-power high-speed motors lacks adaptive speed regulation A chopper speed control device with residual energy feedback function is proposed, which can realize stepless speed regulation of load, residual energy feedback grid and soft start of the system.

The technical solution of the present invention is: a chopper speed control device with residual energy feedback function, including a motor, a planetary gear train and a permanent magnet synchronous generator, the output shafts of the planetary gear train are respectively connected to the rotor of the permanent magnet synchronous generator and load; it is characterized in that: the device is also composed of a chopper speed control device, a current detection control device and a host computer; the stator of the permanent magnet synchronous generator is connected with the chopper speed control device, and the chopper The speed regulating device is composed of a rectification circuit module, a chopper circuit module and an inverter grid-connected circuit module, the output end of the rectification circuit module is connected with the input end of the chopper circuit module, and the output end of the chopper circuit module connected to the input end of the inverter grid-connected circuit module, the host computer is connected to the output end of the inverter grid-connected circuit module, the current detection control device is connected to the chopper speed regulating device, The current detection control device is composed of an inverter current controller and a DSP digital processor, and the DSP digital processor is respectively connected with the rectification circuit module and the inverter grid-connected circuit module.

The rectifier circuit module is composed of three thyristor groups connected in parallel, and each thyristor group is composed of six thyristor elements connected.

The chopper circuit module is composed of two loops connected in parallel, the first loop is composed of an insulated gate bipolar transistor and a diode connected in reverse parallel, and the second loop is composed of a capacitive element, an inductor, and a diode Composed of series circuits in parallel.

The inverter grid-connected circuit module is composed of three groups of IGBTs and diodes connected in antiparallel groups.

The DSP digital processor is a 32-bit microprocessor modeled as DSP2812.

The beneficial effects of the present invention are: a chopper speed regulating device with residual energy feedback function provided by the present invention has a compact and reasonable structure and a clear working principle. Device, current detection control device and host computer, by changing the conduction time of the switch circuit, that is, controlling the width of the output waveform to control the voltage or current of the DC output, with high speed regulation efficiency, low cost, high power factor, harmonic components Small and other advantages.

The specific advantages are as follows:

(1) The device can directly drive the permanent magnet synchronous generator to generate electricity through the decomposition and synthesis of the planetary gear system according to the speed regulation requirements of the load, and then through the chopping of the rectifier circuit, chopper circuit and inverter circuit Wave speed regulation, which converts the electric energy generated by the generator with frequency and voltage changes into constant frequency and constant voltage electric energy. As long as the output power is adjusted, the stepless speed regulation of the load can be realized;

(2) The device contains an inverter grid-connected circuit, which can feed back the surplus energy to the grid and save energy;

(3) The speed regulating device also has the ability to drag the motor in reverse, that is, when the system is started, the device can make the generator run as a motor, convert electrical energy into mechanical energy to help the system start, and play the role of soft start. When the main motor starts, the motor automatically turns into a generator to generate electricity, which saves the starting device of the traditional power generation system.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic diagram of the circuit control module of the present invention.

In the figure: motor 1, planetary gear system 2, planetary gear system rotor 3, permanent magnet synchronous generator 4, permanent magnet synchronous generator rotor 5, chopper speed control device 6, current detection control device 7, load 8, upper computer 9. A rectifier circuit module 10 , a chopper circuit module 11 , an inverter grid-connected circuit module 12 , an inverter current controller 13 , and a DSP digital processor 14 .

detailed description

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1-2, a chopper speed control device with residual energy feedback function includes a motor 1, a planetary gear train 2 and a permanent magnet synchronous generator 4. The output shafts of the planetary gear train 2 are respectively connected to permanent magnet synchronous The generator rotor 5 and the load 8; the device is also composed of a chopper speed control device 6, a current detection control device 7 and a host computer 9; the stator of the permanent magnet synchronous generator 4 is connected with the chopper speed control device 6, and the chopper speed control device Speed device 6 is made up of rectification circuit module 10, chopping circuit module 11 and inverter grid-connected circuit module 12, the output terminal of rectification circuit module 10 is connected with the input terminal of chopping circuit module 11, the output terminal of chopping circuit module 11 It is connected with the input end of the inverter grid-connected circuit module 12, the upper computer 9 is connected and set on the output end of the inverter grid-connected circuit module 12, the current detection control device 7 is connected with the chopping speed regulating device 6, and the current detection control device 7 It is composed of an inverter current controller 13 and a DSP digital processor 14, and the DSP digital processor 14 is connected to the rectification circuit module 10 and the inverter grid-connected circuit module 12 respectively.

As shown in Figure 1-2, a chopper speed control device with residual energy feedback function, the rectifier circuit module 10 is composed of three sets of thyristor groups connected in parallel, and each thyristor group is formed by connecting 6 thyristor elements; The wave circuit module 11 is composed of two loops connected in parallel, the first loop is composed of an insulated gate bipolar transistor and a diode in antiparallel connection, and the second loop is composed of a capacitive element, an inductor, and a diode The series circuits are connected in parallel; the inverter grid-connected circuit module 12 is composed of three groups of IGBTs and diodes connected in antiparallel; the DSP digital processor 14 is a 32-bit microprocessor with a model of DSP2812.

As shown in Figure 1-2, the working principle of a chopping speed control device with residual energy feedback function is as follows: chopping control is performed in the rectifier circuit module, chopping circuit module, and inverter grid-connected circuit module, through Control the on-off of the switch tube to adjust the output voltage and current, and finally control the output power, that is, control the active power connected to the grid, and then realize the stepless speed regulation of the load through the linkage of planetary gears, and can collect information on load changes at any time And feed back to the speed control device, and then realize the chopper speed control of the load through the real-time adjustment of the grid-connected power.

Claims (5)

1. A chopper speed regulating device with residual energy feedback function, comprising electric motor (1), planetary gear train (2) and permanent magnet synchronous generator (4), the output shaft of said planetary gear train (2) is respectively Connect the permanent magnet synchronous generator rotor (5) and the load (8); it is characterized in that: the device is also composed of a chopper speed regulating device (6), a current detection control device (7) and a host computer (9); the The stator of the permanent magnet synchronous generator (4) is connected with the described chopper speed regulating device (6), and the chopper speed regulating device (6) is composed of a rectifier circuit module (10), a chopper circuit module (11) and An inverter grid-connected circuit module (12), the output end of the rectifier circuit module (10) is connected to the input end of the chopper circuit module (11), and the output end of the chopper circuit module (11) is connected to the input end of the chopper circuit module (11). The input ends of the inverter grid-connected circuit module (12) are connected, the upper computer (9) is connected and set on the output end of the inverter grid-connected circuit module (12), and the current detection control device (7 ) is connected with the described chopper speed regulating device (6), and the described current detection control device (7) is made of inverter current controller (13) and DSP digital processor (14), and described DSP digital processor (14 ) are respectively connected with the rectification circuit module (10) and the inverter grid-connected circuit module (12). 2. A chopper speed control device with residual energy feedback function according to claim 1, characterized in that: said rectifier circuit module (10) is formed by three groups of thyristor groups connected in parallel, and each thyristor group consists of 6 thyristor elements are connected to form. 3. A kind of chopping speed regulating device with residual energy feedback function according to claim 1, is characterized in that: described chopping circuit module (11) is formed by two loops connected in parallel, and the first loop is made of An insulated gate bipolar transistor and a diode are connected in antiparallel, and the second loop is composed of a capacitor element, an inductor, and a diode in parallel in series. 4. A chopper speed control device with residual energy feedback function according to claim 1, characterized in that: the inverter grid-connected circuit module (12) is connected by three groups of IGBTs and diodes in antiparallel groups And constitute. 5. A chopper speed regulating device with residual energy feedback function according to claim 1, characterized in that: said DSP digital processor (14) is a 32-bit microprocessor modeled as DSP2812.