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svpwm method based on 120°ab coordinate system
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A technology of a coordinate system and a static coordinate system, which is applied in the control system, vector control system, control generator, etc., and can solve the problems of inconvenient digital controller implementation and complex calculation methods.
Active Publication Date: 2017-03-01
HEBEI UNIV OF TECH
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[0005] The technical problem to be solved by the present invention is: provide the SVPWM method based on the 120°AB coordinate system, adopt the non-orthogonal coordinate system and the flexible sector form, overcome the defects of complex calculation methods in the prior art and inconvenient digital controller implementation , the modulation method using the traditional algorithm has been modified
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Embodiment 1
[0103] This embodiment adopts the large sector mode as follows:
[0104] The first step, the establishment of the 120°AB coordinate system:
[0105] In the 120°AB coordinate system, the A axis coincides with the α axis of the α-β stationary coordinate system, the origin coincides with the origin of the α-β stationary coordinate system, and the B axis coincides with the unit vector in the α-β stationary coordinate system coincide,
[0106] The component u of the modulated target space voltage vector u in the 120°AB coordinate system A , u B With its component u in the α-β stationary coordinate system α , u β , the component u in the d-q synchronously rotating coordinate system d , u q , and the component u in the three-phase 120° coordinate system a , u b and u c The transformation relations between them are shown in the following equations (1)-(3):
[0107]
[0108]
[0109]
[0110] In formula (3), u 0 =0, it is the artificially added zero axis;
[0111]...
Embodiment 2
[0139] This embodiment adopts the small sector mode.
[0140] The first step, the establishment of the 120°AB coordinate system:
[0141] In the 120°AB coordinate system, the A axis coincides with the α axis of the α-β stationary coordinate system, the origin coincides with the origin of the α-β stationary coordinate system, and the B axis coincides with the unit vector in the α-β stationary coordinate system coincide,
[0142] The component u of the modulated target space voltage vector u in the 120°AB coordinate system A , u B With its component u in the α-β stationary coordinate system α , u β , the component u in the d-q synchronously rotating coordinate system d , u q , and the component u in the three-phase 120° coordinate system a , u b and u c The transformation relations between them are shown in the following equations (1)-(3):
[0143]
[0144]
[0145]
[0146] In formula (3), u 0 =0, it is the artificially added zero axis;
[0147] The second...
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Abstract
The invention relates to a 120-degree AB coordinate system based SVPWM (Space VectorPulse Width Modulation) method, relating to the technology that an electric motor is controlled by vectors. The 120-degree AB coordinate system based SVPWM method comprises the following steps: establishing a 120-degree AB coordinate system; sectoring in a large-sector mode or a small-sector mode; judging a sector where the target space voltage vector u is arranged; calculating the action times of all base voltage vectors; and further carrying out three-phase PWM (Pulse-Width Modulation) waveform modulation. According to the method, the nonorthogonal coordinate system and the flexible sector mode are adopted, the defects that the calculating method in the prior art is complex and the calculating method cannot be controlled by a digital controller conveniently are overcome and the modulation method adopting the traditional algorithm is transformed.
Description
technical field [0001] The technical proposal of the present invention relates to controlling the motor through vector, specifically the SVPWM method based on the 120°AB coordinate system. Background technique [0002] In recent years, with the rapid development of digital control technology and power electronics technology, the high-performance transmission control system has higher and higher requirements for the pulse width modulation technology of its inverter circuit. Among them, Space VectorPulse Width Modulation (SVPM) Modulation (SVPWM for short) technology has become one of the widely used PWM technologies because of its high voltageutilization rate and low harmonic loss. [0003] SVPWM is a voltage modulation technology aimed at flux tracking control. It is currently mainly used in three-phase bridge inverter circuits to control the inverter process. This technology is also often used in the current closed loop of vector control to realize current control; it is...
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