Variable-frequency alternating current power generation system and control method thereof

Abstract

The invention discloses a variable-frequency alternating current power generation system and a control method of the variable-frequency alternating current power generation system, and belongs to the technical field of variable-frequency alternating current power generation systems. The variable-frequency alternating current power generation system comprises a stator two-winding asynchronous power generator, a filter inductor, a power converter, an excitation capacitor, a filter capacitor, a storage battery, a diode, a direct current voltage sensor, an alternating current voltage sensor, an alternating current sensor, a controller and a driving circuit, wherein a rotating speed sensor and a current closed loop line are not needed. In the control method for the variable-frequency alternating current power generation system, change information of output voltage and output current are considered comprehensively according to a power balance idea; the slip frequency of the power generator is quickly controlled according to the characteristic that the voltage frequency can be changed quickly, so that electromagnetic torque is adjusted quickly; and power balance is realized, and the output voltage is stable. The control method is simple in structure; complicated coordinate transformation is not needed; the dynamic property and the static property are high; and the control method can be used in independent power supply systems, such as airplanes, naval vessels and the like.

Description

technical field [0001] The invention relates to a frequency conversion AC power generation system and a control method, belonging to the technical field of frequency conversion AC power generation systems. Background technique [0002] With the development of multi-electric / all-electric aircraft and tanks, airborne and vehicle-mounted electrical equipment and precision instruments continue to increase, and new requirements for power systems such as large capacity and high performance have been put forward. Judging from the current research, in addition to the high-voltage DC power system, the frequency conversion AC power system is also an important development direction. For example, the latest large civil airliners B787 and A380 both use variable frequency AC power systems. [0003] In the variable frequency AC power system, due to the output of sinusoidal AC power, synchronous motors are mainly used as the main generator at home and abroad at present, and there are few s...

AI Technical Summary

Problems solved by technology

Although the above-mentioned control strategy based on the idea of ​​"magnetism regulation and voltage regulation" can make the system run stably at variable speeds and loads, it also has certain deficiencies. For example, the first type of method requires complex coordinate transformation due to magnetic field orientation or voltage orientation. The amount of calculation is large, and it is affected by the parameters of the motor; the second type of method uses PWM hysteresis control for the power closed-loop, and the switching frequency is not fixed. The current harmonics of the control winding of the generator are relatively large, which affects the control performance

In addition, since the motor excitation inductance is generally large, and the above method only uses the information of the output voltage, the dynamic performance of the system is not very ideal

Images