A method for power factor control of hybrid excitation synchronous motor
A technology of hybrid excitation synchronization and motor power, which is applied in the field of electric transmission and can solve problems such as power factor reduction
Inactive Publication Date: 2015-10-14
SOUTHEAST UNIV
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[0034] image 3 In order to realize the system block diagram of the hybrid excitation synchronous motor power factor control method of the present invention, the control system consists of an AC power supply, a rectifier, a bus capacitor, a DSP controller, a main power converter, an auxiliary power converter, a sensor, a hybrid excitation synchronous motor, a photoelectric encoder etc.
[0035] The AC power supplies power to the entire system. After being rectified by the rectifier, the voltage is filtered and stabilized, and sent to the main and auxiliary power converters. The Hall voltage sensor collects the bus voltage and sends it to the controller after conditioning. The output terminals of the main and auxiliary power converters are connected to the hybrid excitation synchronous motor. The Hall current transformer collects the phase current and the excitation current, and sends them to the controller after conditioning. The encoder signal collects the speed and rotor pos...
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The invention discloses a method for controlling a power factor of a mixed excitation synchronous motor. The d-axis current, the q-axis current and the exciting winding current are controlled to keep that the power factor of the mixed excitation synchronous motor is identically equal to 1 when the motor works. When the motor works in a low-speed area, the d-axis current, the q-axis current and the exciting winding current are controlled according to the load to keep that the power factor is equal to 1. When the load torque is smaller than or equal to the rated torque, the exciting winding current is 0, the d-axis current and the q-axis current are controlled to enable the power factor to be 1. When the load torque is larger than the rated torque, the d-axis current, the q-axis current and the exciting winding current are controlled in a coordination mode to enable the power factor to be 1. When the motor works in a high-speed area, the common weak magnetism of the d-axis current and the exciting winding current is utilized, and the d-axis current, the q-axis current and the exciting winding current are controlled in a coordination mode to enable the power factor to be 1. By means of the method for controlling the power factor of the mixed excitation synchronous motor to be identically equal to 1, the capacity of an inverter is fully utilized, the power transmission efficiency of a power grid is improved, and the method is especially suitable for high-power speed adjusting systems.
Description
technical field [0001] The invention belongs to the technical field of electric transmission, and relates to a current distribution strategy, in particular to a control method for a hybrid excitation synchronous motor. Background technique [0002] Hybrid excitation synchronous motor is a kind of wide speed regulation motor developed on the basis of permanent magnet synchronous motor and electric excitation synchronous motor. Its main purpose is to solve the problem that the air gap magnetic field of permanent magnet synchronous motor is difficult to adjust. The hybrid excitation synchronous motor has two excitation sources, one is permanent magnet and the other is electric excitation. The magnetic potential generated by the permanent magnet is the main magnetic potential, and the magnetic potential generated by the excitation winding is the auxiliary magnetic potential. This motor combines the advantages of permanent magnet synchronous and electric excitation synchronous mo...
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IPC IPC(8): H02P21/00H02P27/06
Inventor 林明耀赵纪龙
Owner SOUTHEAST UNIV