A method for fast detection of phase sequence disorder of pwm rectifier
A rectifier and disorder technology, which is applied in the field of rapid detection of PWM rectifier phase sequence disorder, can solve the problems of increased hardware cost and inappropriateness, and achieve the effect of improving detection speed, convenient method, and reducing the risk of false detection of phase sequence disorder faults
Active Publication Date: 2021-04-16
中冶赛迪电气技术有限公司
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[0003] The traditional phase sequence disorder detection method usually uses hardware circuits to distinguish the phase sequence of the three phases. On the one hand, it needs to increase the cost of hardware. On the other hand, it is not suitable to add hardware circuits in some mature equipment.
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[0037] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0038] In this embodiment, the system capacity of the PWM rectifier is 250kVA, the grid side voltage is 380V / 50Hz, the AC side incoming line reactor L=0.22mH, the DC side capacitor C=4.7uF, the DC voltage control target U dc * =650V. The control chip adopts TMS320C28346 of TI Company, and the software interrupt period T=250us. Its specific implementation steps are as follows figure 1 shown, including the following four steps:
[0039] S1: Use MIK-DJU-500 as a voltage detection sensor to detect the incoming line voltage U of the rectifier a , U b , U c , the sampling frequency is 4kHz, and after Clark transforms the detected voltage signal, U can be obtained in the two-phase stationary coordinate system. α and U β weight;
[0040] S2: for voltage U α and U β The components are subjected to Park transformation, and the grid angle va...
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The invention relates to a method for quickly detecting phase sequence disorder of a PWM rectifier, belonging to the technical field of power electronic rectifiers. The method includes the following steps: S1: detecting the rectifier incoming line voltage U a , U b , U c , after performing Clark transformation on the voltage signal, U in the two-phase stationary coordinate system is obtained α and U β Component; S2: pair voltage U α and U β The component undergoes Park transformation, and the grid angle value θ is obtained after the phase-locking link; S3: According to the obtained grid angle value θ, the voltage component U α , U β Perform decoupling and decomposition to obtain the negative sequence component U of the grid voltage dn value; S4: the negative sequence component of the grid voltage U dn Perform threshold judgment, when |U dn |Exceeding the threshold U th , it is considered that the rectifier has an incoming line phase sequence disorder fault. The method provided by the invention is convenient and simple to implement, does not require additional hardware circuits for the rectifier, can effectively detect phase sequence disorder faults of incoming lines, and avoids damage to equipment caused by phase sequence disorder.
Description
technical field [0001] The invention belongs to the technical field of power electronic rectifiers, and relates to a method for rapidly detecting phase sequence disorder of a PWM rectifier. Background technique [0002] As the interface between various power electronic devices and the power grid, PWM rectifier is widely used in the fields of national production and life, effectively improving the efficiency of people's life and work. If the input and output lines of the PWM rectifier are in disordered phase sequence during use, the PWM rectifier will not operate normally, affecting the normal use of the user, and even causing safety problems in severe cases. Therefore, it is very necessary to detect the phase sequence disorder of the PWM rectifier. [0003] The traditional phase sequence disorder detection method usually uses hardware circuit to distinguish the three-phase phase sequence. On the one hand, it needs to increase the hardware cost. On the other hand, it is not ...
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IPC IPC(8): G01R29/18
CPCG01R29/18
Inventor 赵聪郝亚川干永革魏立彬孙倩倩任亚葱
Owner 中冶赛迪电气技术有限公司