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Charger output voltage harmonic suppression method and system based on compound control
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A composite control and harmonic suppression technology, which can be applied to DC circuits to reduce harmonics/ripples, etc., and can solve the problems of huge capacitance, larger volume, and reduced power density of chargers.
Pending Publication Date: 2021-05-18
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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[0004] The traditional way to eliminate low frequency is to connect a large-capacity electrolytic capacitor in parallel at both ends of the DC bus, but the required capacitor capacity is very large, and it needs to be equipped with electrical components such as a pre-charging circuit and input reactor, which makes the system volume larger and the cost rises. , the power density of the charger decreases, and there is no stable control method that can suppress the low-frequency ripple in the output voltage and current of the charger
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Embodiment 1
[0054] refer to Figure 1 to Figure 13 As shown, this example discloses a specific implementation of a method for suppressing harmonics of the output voltage of a charger based on compound control (hereinafter referred to as "method").
[0055] Specifically, refer to figure 1 and figure 2 As shown, the method disclosed in this embodiment includes the following steps:
[0056] Step S1 , judging whether the charger meets the soft-start requirement after pre-charging, and if so, enters into soft-start.
[0057] Specifically, in some of these embodiments, the system performs pre-charging first, and after the pre-charging is completed, it is judged whether the soft-start requirement is met, and if so, enters into a soft-start, and waits if the soft-start requirement is not met.
[0058] Then step S2 is executed, after the soft start of the charger is completed, it is judged whether the operation requirement is met, and if so, the operation state of the charger is judged.
[0059...
Embodiment 2
[0091] Combined with a method for suppressing harmonics of the output voltage of a charger based on compound control disclosed in Embodiment 1, this embodiment discloses a specific method for suppressing harmonics of the output voltage of a charger based on compound control (hereinafter referred to as "system") Implementation example.
[0092] The system includes:
[0093] The soft start judging module judges whether the charger meets the soft start requirements after precharging, and if so, enters the soft start;
[0094] The operation requirement judging module, after the soft start of the charger, judges whether the operation requirement is met, and if so, judges the operation status of the charger;
[0095] PI control running module, running PI control according to the running state;
[0096] The composite control module judges whether the composite control flag is 1, if so, switches the composite controller to perform composite control, otherwise continues to run the PI c...
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Abstract
The invention discloses a charger output voltageharmonic suppression method and system based on compound control, and the method comprises the following steps: judging whether a charger meets a soft start requirement after being pre-charged, and entering soft start if the charger meets the soft start requirement; after the soft start of the charger is finished, judging whether an operation requirement is met or not, and if so, judging the operation state of the charger; operating P I control according to the operating state; and judging whether the composite control flag bit is 1 or not, if so, switching the composite controller to perform composite control, and if not, continuing to operate the P I control. According to the invention, the output voltage and current low-frequency ripples of the charger are suppressed based on quasi-proportional resonance and repetitive control, and the control of the output voltage and current and the suppression of periodic voltage and current ripples are realized.
Description
technical field [0001] The invention relates to the technical field of charger control. More specifically, the present invention relates to a method and system for suppressing harmonics of the output voltage of a charger based on compound control. Background technique [0002] Chargers are often used in high-speed rail, bullet trains, and related facilities that use batteries for power supply. They are important power supply equipment. Chargers usually include charging circuits such as input circuits, full-bridge inverter circuits, output circuits, and control circuits. The train charger is used to supply power to the DC load of the vehicle and charge the storage battery. According to the different working conditions of the train, the charger mainly has three working modes: constant voltage, charging current limiting and total current limiting. [0003] Nowadays, the front-end of the phase-shifting full-bridge converter in the existing phase-shifting full-bridge charger sy...
Claims
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