Three-phase inverter bridge instantaneous power measurement method considering svpwm dead time
A three-phase inverter bridge and instantaneous power technology, applied in the field of electric transmission, can solve the problems of inaccurate instantaneous power measurement, not fully considering the dead time of SVPWM, etc., and achieve the effect of improving measurement accuracy
Active Publication Date: 2019-12-10
SOUTHEAST UNIV
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[0004] Purpose of the invention: the purpose of the present invention is to provide a kind of three-phase inverter bridge instantaneous power measurement method that considers SVPWM dead zone time, has solved existing in the prior art and needs to install DC bus side current sensor, instantaneous power measurement is inaccurate, does not have Fully consider the problem of SVPWM dead time
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[0038] The technical solution of the present invention will be further introduced below in conjunction with specific embodiments.
[0039] This specific embodiment discloses a three-phase inverter bridge instantaneous power measurement method considering the dead time of SVPWM. SVPWM is the English abbreviation of Space Vector Pulse-width Modulation, and its Chinese meaning is voltage space vector pulse width modulation. This method includes the following steps:
[0040] S1: According to figure 1 Definition of the current direction of the three-phase inverter bridge, and image 3 In the definition diagram of SVPWM basic voltage vector action time and dead time, in the interrupt program triggered after the digital-to-analog conversion of the controller is completed, the current sensor is used to collect the first phase current i of the motor A , The second phase current i B And DC bus voltage V BUS , And sent to the controller for signal processing to obtain the third phase current...
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The invention discloses a three-phase inverter bridge instantaneous power measurement method in consideration of SVPWM dead time. The method, in consideration of SVPWM dead time and by measuring the two-phase current output from a three-phase inverter bridge and the voltage of a DC bus and determining a sector on which a SVPWM vector currently acts, calculates the instantaneous output power of theDC bus side based on the active time and the dead time of the voltage vector during a current SVPWM active period and the period time. The method does not require a separate DC bus current sensor, and can reconstruct the instantaneous current of the DC bus by the output two-phase current of the inverter bridge. The method considers the influence of the SVPWM dead time on the power measurement, and improves the measurement accuracy of the instantaneous power.
Description
Technical field [0001] The present invention relates to electric drive technology, in particular to a three-phase inverter bridge instantaneous power measurement method considering SVPWM dead time. Background technique [0002] The three-phase inverter bridge is a common topology in the field of motor control. The instantaneous output power of the DC bus reflects the current active output value of the inverter. Measuring the instantaneous power of the DC bus can be used as a reference variable for system operation, which is of great significance. The traditional power measurement method calculates power by measuring the voltage and instantaneous current on the DC bus side. However, this method requires an additional installation of a current sensor on the DC bus side, and also needs to filter the measured instantaneous current, and the phase delay caused by the filter will cause the problem of inaccurate instantaneous power measurement. There is a corresponding relationship bet...
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IPC IPC(8): H02M7/5387H02M7/5395
Inventor 林明耀伍锡坤杨公德王朋杨海
Owner SOUTHEAST UNIV