Pulse generation method for control of subway auxiliary inverter
An auxiliary inverter, pulse generation technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve the problem that high-frequency PWM modulation is not suitable for subway auxiliary power supply, etc. The effect of reducing design cost, reducing switching loss and improving conversion efficiency
Active Publication Date: 2015-02-25
CRRC YONGJI ELECTRIC CO LTD
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Problems solved by technology
[0004] The invention solves the problem that conventional high-frequency PWM modulation is not suitable for high-voltage and high-power occasions such as subway auxiliary power supplies, and provides a pulse generation method for subway auxiliary inverter control
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[0015] The pulse generation method for the subway auxiliary inverter control is realized by the following steps:
[0016] 1) Assume that any phase of the three-phase system has a total of N state changes within 1 / 4 cycle, and N is 5, 7, 9, 11, 13. According to the 1 / 4 cycle of the grid cycle, the even symmetry is even, and the 1 / 2 cycle is odd symmetry. , any phase of the three-phase system has a total of 2N+1 state changes in half a cycle (2N state changes, plus the state change at 180° position), and there are 2(2N+1) state changes in one cycle;
[0017] 2) For the pulse state starting at low level or high level, obtain the corresponding lookup table of modulation degree M and N switching angle values distributed with different precision, and the range of modulation degree M is 0.1-1.15; and then through the steps 1) The even symmetry and odd symmetry are obtained to obtain the corresponding look-up table of the degree of modulation M distributed with different precision a...
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The invention relates to inverter control techniques, in particular to a pulse generation method for control of a subway auxiliary inverter and solves the problem that the conventional high-frequency PWM (pulse width modulation) is not sufficiently suitable for high-tension high-power applications of subway auxiliary powers. The method includes: acquiring a corresponding query table of modulation degrees M and switching angle values; acquiring actual output values of the modulation degrees M, and according to the actual output values, finding a switching value group from the corresponding query table; in an interrupt cycle of 5 degrees, determining whether one or two switching angle values falling in an electrical angle range covered by the current interrupt cycle exist in the found switching angle value group; if one existing, allowing a pulse state change at the switching angle value; if two existing, allowing pulse state changes at the two switching angle values; if no one existing, allowing no pulse state change. The method meets the subway auxiliary inverter for output voltage feature, grid voltage sudden change and load sudden change under different direct-current input voltages.
Description
technical field [0001] The invention relates to an inverter control technology, in particular to a pulse generation method used for subway auxiliary inverter control. Background technique [0002] The auxiliary power supply system of the subway is an essential key electrical component on the subway vehicle, which is responsible for providing stable power supply for AC loads such as vehicle air conditioning, electric heating, lighting, air compressors, control circuits of various systems, train monitoring systems, on-board signals and communication equipment, etc. The three-phase four-wire 380V (220V) power supply. Subway auxiliary power is obtained from the auxiliary inverter. Whether the auxiliary power system works normally or not directly affects the safe and stable operation of the train and the comfort of passengers. [0003] In the subway, the auxiliary inverter mostly adopts the traditional two-level inverter, because of its mature technology, simple control and eas...
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Login to View More IPC IPC(8): H02M7/537H02M1/088
CPCH02M1/088H02M7/5387
Inventor 李学亮司军民吴晓威李康乐张雅锟廉泽波
Owner CRRC YONGJI ELECTRIC CO LTD