阅读说明：本技术 一种输出稳定电压的功率变换器控制系统 (Power converter control system for outputting stable voltage ) 是由 张月匣 孔德伟 刘凯杰 韩知杰 孙保进 于 2021-08-06 设计创作，主要内容包括：本发明涉及车载不间断电源技术领域,尤其涉及一种输出稳定电压的功率变换器控制系统,其包括功率变换器、输入单元、输出单元、车载发电机及用电设备,功率变换器的主回路包括整流稳压单元、逆变单元及双向电压变换单元,整流稳压单元通过输入单元与车载发电机及市电连接,整流稳压单元与逆变单元通过线缆连接,逆变单元与用电设备之间通过输出单元连接,双向电压变换单元与整流稳压单元及逆变单元之间通过电缆双向连接,整流稳压单元包括三相PWM整流模块及稳压支撑电容。本发明提供的系统性能稳定,具有瞬时补功功能且发电机熄火后保证设备不间断供电,以满足大功率稳定输出电压要求。(The invention relates to the technical field of vehicle-mounted uninterruptible power supplies, in particular to a power converter control system for outputting stable voltage, which comprises a power converter, an input unit, an output unit, a vehicle-mounted generator and electric equipment, wherein a main loop of the power converter comprises a rectifying and voltage-stabilizing unit, an inversion unit and a bidirectional voltage conversion unit, the rectifying and voltage-stabilizing unit is connected with the vehicle-mounted generator and commercial power through the input unit, the rectifying and voltage-stabilizing unit is connected with the inversion unit through cables, the inversion unit is connected with the electric equipment through the output unit, the bidirectional voltage conversion unit is bidirectionally connected with the rectifying and voltage-stabilizing unit and the inversion unit through cables, and the rectifying and voltage-stabilizing unit comprises a three-phase PWM (pulse width modulation) rectifying module and a voltage-stabilizing support capacitor. The system provided by the invention has stable performance, has an instant power supplement function, and ensures that equipment supplies power uninterruptedly after the generator is shut down so as to meet the requirement of high-power stable output voltage.)

1. A power converter control system for outputting stabilized voltage is characterized by comprising a power converter, an input unit, an output unit, a vehicle-mounted generator and electric equipment, wherein a main loop of the power converter comprises a rectification voltage stabilizing unit, an inversion unit and a bidirectional voltage conversion unit, the rectification voltage stabilizing unit is connected with the vehicle-mounted generator and a mains supply through the input unit, the rectification voltage stabilizing unit is connected with the inversion unit through a cable, the inversion unit is connected with the electric equipment through the output unit, the bidirectional voltage conversion unit is bidirectionally connected with the rectification voltage stabilizing unit and the inversion unit through cables, the rectification voltage stabilizing unit comprises a three-phase PWM (pulse-width modulation) rectification module and a voltage stabilizing support capacitor, the inversion unit is a three-phase four-bridge arm inversion system, and the bidirectional voltage conversion unit comprises a bidirectional BUCK-BOOST and a storage battery.

2. The power converter control system of claim 1, wherein the input unit comprises an input reactance, a pre-charge circuit and a power factor correction unit.

3. The power converter control system of claim 1, wherein said output unit comprises an output reactance, a safety capacitor and a switch.

4. The power converter control system of claim 1, wherein the PWM rectifier module employs a voltage vector oriented dual closed-loop control strategy, the outer loop is a DC bus voltage closed-loop control, and the inner loop is a current feed-forward decoupling control.

5. The power converter control system outputting a stabilized voltage according to claim 4, wherein the three-phase four-leg inverter system compensates for unbalanced load by symmetrical component calculation.

6. The system of claim 1, wherein the power converter comprises a temperature sampling control device and a voltage calibration device, and the power converter samples the temperature, the dc and ac voltages, and the current of the power converter to monitor the status of the vehicle generator, the battery, and the converter and to check the fault.

7. The power converter control system according to claim 1, wherein a display screen is provided, the power converter performs battery voltage and power management and information interaction between the power converters through the CAN bus, and the battery voltage, the power, the internal temperature of the motor and various alarm information are displayed on the display screen.

Technical Field

The invention relates to the technical field of vehicle-mounted uninterruptible power supplies, in particular to a power converter control system for outputting stable voltage.

Background

At present, the power requirement of tactical vehicle loading equipment is increasingly increased, and the diversified power supply requirements of universal finger equipment and loading weapon equipment are increased, so that the power requirement of a vehicle-mounted generator is increasingly increased, and the final power quality and stability requirements are also increasingly high. At present, an outdoor vehicle-mounted power generation system is generally a diesel generator or a power takeoff power generation system, and although the diesel generator can generate high-quality stable electric energy, the diesel generator is large in weight, large in size and expensive in price. The power takeoff power generation system is arranged on a vehicle chassis, but the power takeoff power generation system can only generate electric power below 20Kw generally and cannot meet the requirement of high-power stable output with the output power above 50 Kw.

Disclosure of Invention

The invention aims to solve the technical problem of providing a power converter control system which has stable performance, has an instant power compensation function, ensures that equipment can supply power uninterruptedly after a generator is switched off, and meets the requirement of high-power stable output voltage.

The invention is realized by the following technical scheme:

a power converter control system for outputting stable voltage comprises a power converter, an input unit, an output unit, a vehicle-mounted generator and electric equipment, wherein a main loop of the power converter comprises a rectification voltage-stabilizing unit, an inversion unit and a bidirectional voltage conversion unit, the rectification voltage-stabilizing unit is connected with the vehicle-mounted generator and a mains supply through the input unit, the rectification voltage-stabilizing unit is connected with the inversion unit through a cable, the inversion unit is connected with the electric equipment through the output unit, the bidirectional voltage conversion unit is bidirectionally connected with the rectification voltage-stabilizing unit and the inversion unit through cables, the rectification voltage-stabilizing unit comprises a three-phase PWM (pulse-width modulation) rectification module and a voltage-stabilizing support capacitor, the inversion unit is a three-phase four-bridge arm inversion system, and the bidirectional voltage conversion unit comprises a bidirectional BUCK-BOOST and a storage battery.

Preferably, the input unit comprises an input reactance, a pre-charging circuit and a power factor correction unit.

Further, the output unit comprises an output reactance, a safety capacitor and a switch.

Furthermore, the PWM rectifier module adopts a voltage vector directional double closed-loop control strategy, the outer loop is in direct-current bus voltage closed-loop control, and the inner loop is in current feedforward decoupling control.

And optimally, the three-phase four-bridge arm inverter system compensates unbalanced loads through symmetrical component calculation.

Furthermore, the power converter is provided with a temperature sampling control device and a voltage calibration device, and the temperature, the direct current, the alternating current voltage and the current of the power converter are sampled, so that the state monitoring and the fault checking of the vehicle-mounted generator, the storage battery and the converter are realized.

Furthermore, the power converter control system for outputting the stable voltage is provided with a display screen, the power converter performs battery voltage and electric quantity management and information interaction between the power converters through a CAN bus, and the battery voltage, the electric quantity, the internal temperature of the motor and various alarm information CAN be displayed on the display screen.

The invention has the advantages of

The power converter control system for outputting the stable voltage has the following advantages that:

1. the power is high, the function is reliable, the performance is stable, and the power consumption requirement of the existing corresponding military upper equipment can be met;

2. the storage battery has a power supplementing function, and can supplement power instantly when the output power of the generator is insufficient;

3. after the generator is flamed out, the storage battery supplements power, and uninterrupted power supply of the equipment can be ensured.

Drawings

FIG. 1 is a system diagram of the present invention;

FIG. 2 is a schematic diagram of a power converter circuit configuration;

FIG. 3 is a PWM rectification control block diagram;

FIG. 4 is a diagram of a voltage-current control system;

FIG. 5 is a voltage vector diagram of a voltage modulation strategy;

fig. 6 is a schematic diagram of a control strategy based on the SCC method;

Detailed Description

The utility model provides an output steady voltage's power converter control system, it includes the power converter, the input unit, the output unit, on-vehicle generator and consumer, the major loop of power converter includes rectification voltage stabilizing unit, contravariant unit and two-way voltage transformation unit, rectification voltage stabilizing unit passes through input unit and on-vehicle generator and mains connection, rectification voltage stabilizing unit passes through the cable with the contravariant unit and is connected, be connected through the output unit between contravariant unit and the consumer, pass through cable both way junction between two-way voltage transformation unit and rectification voltage stabilizing unit and the contravariant unit, rectification voltage stabilizing unit includes three-phase PWM rectifier module and steady voltage support capacitance, steady voltage support capacitance can play the steady voltage effect. The AC-DC adopts a PWM (pulse-width modulation) rectification circuit topological structure, can realize unit power factor control at the side of the generator and adapt to wide-range voltage and frequency changes of the generator, and detects three-phase input phase, line voltage, phase current, direct-current bus voltage and current.

The inversion unit is a three-phase four-leg inversion system, can meet the requirements of three-phase four-wire system loads, and ensures that the output voltage is 380V/50 Hz. Meanwhile, the phase voltage, the phase current and the neutral line current of the three-phase output can be detected.

The bidirectional voltage conversion unit comprises a bidirectional BUCK-BOOST and a storage battery, so that the storage battery can be charged when the system normally operates, when the output power of the generator is insufficient, the battery can supplement power instantly to ensure stable output of equipment, and after the generator is flamed out, the battery supplements power to ensure uninterrupted power supply of the equipment.

Optimally, the input unit comprises an input reactance, a pre-charging circuit and a power factor correction unit, and stable input control is conveniently realized.

Furthermore, the output unit comprises an output reactance, a safety capacitor and a switch, so that stable output control is conveniently realized.

Furthermore, the PWM rectifier module adopts a voltage vector directional double closed-loop control strategy, the outer loop is in direct current bus voltage closed-loop control, the inner loop is in current feedforward decoupling control, and direct current voltage stable control and unit power factor control on the alternating current side are conveniently realized.

And optimally, the three-phase four-bridge arm inverter system compensates unbalanced loads through symmetrical component calculation. The system includes a plurality of channels, each of which contains an outer voltage loop and an inner current loop. Both control loops employ PI controllers to ensure voltage and current regulation, the coupling existing in the d-q axis is also eliminated by a decoupling term.

The SCC symmetrical component calculation method is used to decompose unbalanced voltages and currents into symmetrical components so that the control variables can be adjusted independently in three different sequential components, the first channel controlling the positive sequence components of the voltages and currents in the dq0 coordinate system, and the second channel adjusting the negative sequence components of the voltages and currents. The third channel is used for compensating the same polarity voltage and current. Independent control in three different sequential assemblies provides excellent performance to compensate for unbalanced loads.

Furthermore, the power converter is provided with a temperature sampling control device and a voltage calibration device, and the temperature, the direct current, the alternating current voltage and the current of the power converter are sampled, so that the state monitoring and the fault checking of the vehicle-mounted generator, the storage battery and the converter are realized.

The realized protection functions comprise:

overheat protection: when the temperature of the detection point exceeds 90 ℃, the shutdown alarm is given.

Overvoltage protection: input overvoltage protection: in the idle state, when the mains supply input voltage exceeds the set voltage value 418V, the shutdown protection alarms. Output overvoltage protection: in the no-load state, when the system output alternating current voltage is larger than or equal to a set voltage value 399V (not larger than 1.05 times of a rated value), the alternating current output is automatically cut off.

Undervoltage protection: input undervoltage protection: in the idle state, when the mains supply input voltage is lower than the set voltage value 342V, the shutdown protection alarms. Output under-voltage protection: in the no-load state, when the system output AC voltage is less than or equal to a set voltage value 361V (not less than 0.95 times of a rated value), the AC output is automatically cut off.

Overcurrent protection: the output current is gradually increased to 120% of the rated load (deviation is allowed), and no output is protected for 2 min.

Short-circuit protection: when the output short circuit occurs, the shutdown protection alarms, and the equipment is not damaged.

Overcurrent protection of a power tube: and the power switch tube voltage drop exceeds a safe value, and the shutdown alarm is given.

Furthermore, the power converter control system for outputting the stable voltage is provided with a display screen, the power converter performs battery voltage and electric quantity management and information interaction between the power converters through a CAN bus, and the battery voltage, the electric quantity, the internal temperature of the motor and various alarm information CAN be displayed on the display screen.

In conclusion, the power converter control system for outputting the stable voltage, which is protected by the invention, has stable performance, has an instant power supplementing function, ensures that equipment is supplied with power uninterruptedly after a generator is shut down, and can meet the requirement of high-power stable output voltage.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.