Application of PSG feedback unit on dynamometer
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- Time of issue:2018-04-16
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Application of PSG feedback unit on dynamometer
Introduction to Dynamometer:
The dynamometer is also called the motor type test system in the motor testing industry, which mainly tests the load characteristics of the motor. The dynamometer is a load machine that applies a variable torque load to the motor under test and absorbs its power. Equipped with a display control system, it can test various types of motors (such as: single three-phase asynchronous motors, synchronous motors, DC motors, series The input voltage, current, power and output torque, speed, power and characteristic curve of excitation motor, power tool, wheel hub motor, starter motor, automobile motor, etc.). According to the working principle, it is mainly divided into hysteresis dynamometer, magnetic particle dynamometer, electric turbine dynamometer, and electric dynamometer.
Especially for the power dynamometer system, the DC motor or AC motor is used as the conversion element to convert electrical energy into the mechanical energy of the motor rotor, load the load motor in the form of torque, and control the load torque to realize the load Simulation of the mechanical load carried by the motor.
Dynamometer system composition diagram
Electric dynamometer is a comprehensive test equipment for performance testing of various power machinery. It is mainly used to test the input power of fans, water pumps, hydraulics or gear transmissions. It can also be used as a test for the output power of engines. Function (with electric working conditions and power generation working conditions), high-performance important testing equipment. It is coaxially connected with the motor under test through a shaft connector, and is used to simulate and control the load of the motor under test to measure the torque, speed, current, voltage, power, efficiency and other parameters of the motor. And other special dynamic test items, such as safety test, dynamic balance test and so on.
Application case of PSG energy feedback in the dynamometer industry
Analysis of the current dynamometer control system scheme:
The first option:
Use ABB, Siemens inverter feedback integrated machine (four-quadrant inverter) to meet the operational requirements of the dynamometer. This kind of scheme has high price, good torque accuracy and stable speed accuracy.
The second option:
Use ABB, Siemens common vector inverter to match the IPC energy feedback solution to meet the operating requirements of the dynamometer. This kind of scheme, on the one hand, integrates the general advantages of the ABB and Siemens inverter vector algorithms, and the torque accuracy and speed stability accuracy fully meet the accuracy requirements of the dynamometer. On the other hand, IPC energy feedback is more cost-effective, and it can stably feed back the energy of the motor in the power generation state to the grid. Current harmonics are less than 5%, and voltage harmonics are less than 1%.
The third option:
For domestic four-quadrant inverters, the price of this type of program is not much different from that of the second program, but the vector algorithm of domestic inverters is limited, especially in terms of speed stability accuracy and torque accuracy control that affect the performance of the dynamometer.
IPC energy feedback core technology description:
1. Output pure sine wave, THD<5%, meet the strict EN55022 CLASS A technical standard, and always feed back clean electric energy;
2. The energy conversion efficiency is as high as 97.5%;
3. Built-in reactor and filter, plug and play;
4. Simple operation, saving installation and training costs
Application case analysis of dynamometer energy feedback:
Tianjin Keda Power Testing Technology Co., Ltd. is mainly dedicated to the testing of motorcycles, automobiles, engines and their key components. It has a development history of more than 20 years. Since 2008, it has been using Siemens general vector inverters and our company's energy feedback Plan.
Take the ACD-11 AC power dynamometer, which is a special testing equipment for the bench test frame of a small general gasoline engine as an example. The system adopts AC motors and frequency conversion control technology, as well as computer technology and test software to meet the test requirements of small general gasoline engines. .
1. Use on-site pictures:
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Tianjin Keda 37KW Dynamometer Control Cabinet
2. Main functions:
1. This system is mainly composed of the following parts:
(1) Host: AC power dynamometer;
(2) Dynamometer control: SIEMENS AC frequency conversion speed regulation device, using manual knob to adjust operating conditions;
(3) Detection and data processing part: use industrial computer to detect and display various detection parameters, perform data management, print test reports, and draw engine characteristic curves;
2. Using SIEMENS full digital control device, AC electric dynamometer has two operating states: electric and dynamometer. The engine can be driven to make the engine run automatically when it is electric, and load is applied to the engine during dynamism, and the control characteristics are fast and stable;
3. When the dynamometer is running, the mechanical energy of the engine is absorbed by the IPC energy feedback unit and fed back to the grid, which can reach the rated torque capacity of the dynamometer when running at low speed;
4. The dynamometer adopts constant speed control mode; the system test accuracy maintains the control accuracy of Siemens general vector inverter
(1) Rotation speed: ±0.2% ±1r/min;
(2) Torque: ±1%;
PSG series energy feedback device technical specifications
Advantages of PSG series energy feedback device
The use of PSG series energy feedback devices has the following significant advantages:
1. Realize substantial energy saving. The energy feedback device feeds back the energy generated by the dynamometer motor to the grid when the dynamometer motor is in the power generation state, which saves the electrical energy consumed by the braking resistor in the original control method.
2. The heat loss is less than 3% of the energy consumption braking, which greatly reduces the ambient temperature of the belt conveyor inverter system, improves the working environment of the electrical system, and prolongs the service life of the centrifuge equipment.
3. Using PWM pulse width modulation technology, full voltage tracking to ensure accurate output voltage.
4. The PSG series energy feedback device can effectively suppress the output harmonics, and the harmonic content output to the power grid is less than 5%.
5. Adopt key technology to eliminate the influence of energy feedback device on the rectifier part of the frequency converter, and effectively prevent the rectifier part of the frequency converter from overheating.
6. Powerful protection function, strong ability to adapt to grid voltage fluctuations. PSG series energy feedback devices have comprehensive protection functions, with overvoltage, overcurrent, short circuit, overload, and lack of equal protection.
7. PSG series energy feedback device is a new generation of digital feedback device, adopting DSP central processing unit, with high speed, high precision, good stability, and strong anti-interference ability. Compared with analog feedback device, it has incomparable advantages.
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