Mcu Develop
2008
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Mcu Develop
The Recent Development Of The Industry In China Inverter Analysis
Inverter is the motion control system, power converter. Today's motion control system that contains a multi-disciplinary areas of technology, the general trend is: the exchange of technology-driven, high-frequency power converters, and control of digital, intelligent and networking. Therefore, the inverter power conversion as an important system components, providing controlled, high-performance VVVF AC power obtained rapidly.
It will take approximately 30 years of R & D and application of practice, with the new power electronic devices and high-performance microprocessor control technology applications as well as the development of increasingly high performance and low cost inverter size, getting smaller and smaller, while the manufacturers are still constantly improve the reliability of achieving further small-scale inverter lightweight, high performance and multi-functional, as well as pollution-free and doing the new effort. Inverter performance advantages and disadvantages, a look at the output AC voltage harmonics on the motor effects of two harmonic pollution depends on the grid and input power factor, 3 energy loss depends on its own (ie, efficiency) are? Here TV towers, only the delivery - direct - AC inverter, for example, described its development trends:
1, the main circuit power switching elements of self-turn-off, modular, integrated, intelligent, continuously improve the switching frequency, switching losses further reduced.
2, inverter main circuit topology aspects:
The network side converter converter for low voltage small-capacity device often used 6-pulse converter, and for medium-voltage large-capacity device with multiple pulses of 12 or more converters. Load-side converter for low voltage small-capacity device often used two-level inverter bridge, while for medium voltage large-capacity installations in multi-level inverter. For the four-quadrant operation of transmission, in order to achieve the renewable energy converter back to the grid and save energy, network-side converter should be reversible converter, simultaneous two-way flow of power can be a dual PWM converter, the network side converter device can be properly controlled input current close to sine wave to reduce pollution grid. At present, the low, medium voltage inverter are of such products.
3, pulse width modulation inverter transformer control method can be used sine wave pulse-width modulation (SPWM) control, elimination of the specified number of harmonics PWM control, current-tracking control, voltage space vector control (magnetic-chain tracking control).
4, AC motor inverter control methods to adjust the progress is mainly reflected by the standard volume control to the high dynamic performance of vector control and direct torque control of growth and development of speed sensorless vector control and direct torque control systems.
5, microprocessor digital control advances of modern control the direction of development: the motion control system is a fast system, particularly in high-performance AC motor control need to store a variety of data and rapid real-time processing large amounts of information. In recent years, major foreign companies have introduced to DSP (digital signal processor)-based core, accompanied by peripheral functions required for motor control circuitry, integrated in a single chip, known as the single-chip DSP motor controllers, the price greatly reduced, smaller in size, compact structure, easy to use and reliability to improve. MCU DSP and general than to deal with number-crunching capabilities enhanced 10 ~ 15 times to ensure that the system has superior control performance.
Digital control to enable the hardware to simplify, flexible control algorithms to control the great flexibility to implement complex control law, so that modern control theory in motion control system applied to become a reality, easy, and the upper system connection for data transmission, ease of fault diagnosis strengthen the protection and monitoring features make the system intelligent (as some converter with self-adjusting function).
6, AC synchronous motor drive has become AC adjustable in a star, especially the permanent magnet synchronous motors, brushless motors to obtain the structure of a high power factor, efficiency is high, the rotor speed to strictly keep pace with the power frequency. Synchronous motor frequency control systems are controlled separately controlled inverter and inverter two categories. Frequency-controlled synchronous motor and DC motor in principle very similar, with the power electronics converter replaces the mechanical commutator DC motors, such as the use of AC - Direct - AC converter when the transformer is called "No DC commutator motors," or "brushless DC motor (BLDC)". The traditional frequency-controlled synchronous machine speed control system has a rotor position sensor is being developed without rotor position sensor system. Synchronous motor control inverter ways he can use vector control, which according to the rotor field-oriented induction motor vector control than simple.
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