The biggest difference between a Wind-Solar Hybrid Power System and an excitation generator is that its field magnetic field is generated by the permanent magnet. Permanent magnet in the motor is both a magnetic source, but also a part of the magnetic circuit. The magnetic properties of the permanent magnet are not only related to the manufacturing process of the manufacturing plant, but also to the shape and size of the permanent magnet, the capacity of the magnetizing machine and the method of magnetizing, and the specificity of the performance data is very large. And the magnetic flux and magnetomotive force that the permanent magnet can provide in the motor also change with the material performance, the size and the motor running state of the rest of the magnetic circuit. In addition, Wind-Solar Hybrid Power System magnetic circuit structure varied, leakage magnetic circuit is very complex and large proportion of leakage magnetic flux, ferromagnetic material part is relatively easy to saturation, the magnetic guide is non-linear. These have increased the complexity of the Wind-Solar Hybrid Power System electromagnetic calculation, so that the accuracy of the calculation results are lower than the electric excitation generator. Therefore, it is necessary to establish a new design concept, to reanalyze and improve the magnetic circuit structure and control system; must use modern design methods to study the new analytical methods to improve the accuracy of design calculations; must study the use of advanced testing methods and manufacturing Process.
1. control problem
Wind-Solar Hybrid Power System made without external energy to maintain its magnetic field, but also caused by external regulation, control of its magnetic field is extremely difficult. These have limited the scope of application of Wind-Solar Hybrid Power Systems. However, with the mosFET, IGBTT and other power electronic devices, the rapid development of control technology, Wind-Solar Hybrid Power System in the application without magnetic field control and only the motor output control. Designed to require NdFeB materials, power electronic devices and computer control of three new technologies together, so that Wind-Solar Hybrid Power Systems in a new operating conditions.
2. irreversible demagnetization problem
If the design and use of improper, Wind-Solar Hybrid Power System in the high temperature (NdFeB permanent magnet) or too low (ferrite permanent magnet), the impact of the current generated by the armature reaction, or in the severe mechanical vibration When it is possible to produce irreversible demagnetization, or called loss of magnetic, so that motor performance is reduced, or even can not be used. Therefore, it is necessary to study and develop the methods and apparatus for inspecting the thermal stability of permanent magnetic materials for use in motor manufacturers, and to analyze the anti-demagnetization capability of various structural forms in order to ensure that the use of the corresponding measures in the design and manufacture The magnetic generator does not lose its magnetism.
As the current price of rare earth permanent magnet materials is still relatively expensive, the cost of rare earth Wind-Solar Hybrid Power Systems are generally higher than the electric excitation generators, but this will be in the motor high performance and operation to get better compensation. In the future design will be based on the specific use of the occasion and requirements, performance, price comparison, and structural innovation and design optimization to reduce manufacturing costs. There is no denying that the cost of the product being developed is slightly higher than the current generators, but we believe that as the product becomes more perfect, the cost problem will be well resolved. "The customer's focus is on the cost per kilometer of watt." His statement fully demonstrates that the market prospects for AC Wind-Solar Hybrid Power Systems will not be plagued by cost problems, the head of the technical department of DELPHI (Delphi) in the United States.
Excitation generator and Wind-Solar Hybrid Power System output difference is as follows:
1. The initial electromotive force is provided in different ways
Excitation generator at the start time to have an initial electromotive force to make the excitation coil magnetic field. By the external power supply or Wind-Solar Hybrid Power System to generate a small electromotive force to provide electromotive force, work properly after the work on their own output voltage. While the Wind-Solar Hybrid Power System sets the initial electromotive force by means of permanent magnets.
2. Magnetic field strength is different
The excitation generator can change the field magnetic field by changing the current of the field coil. And the magnetic field strength can be large and controllable. While the Wind-Solar Hybrid Power System is prone to magnetic field inclusion phenomenon.