阅读说明：本技术 一种高压变频电机一体式装置 (High-voltage variable frequency motor integrated device ) 是由 尹彭飞 张长元 王伟 张岩 郭培彬 于 2020-03-26 设计创作，主要内容包括：一种高压变频电机一体式装置,包括输入电抗器、整流单元、直流母线滤波、逆变单元和多输入端的电动机,其特征是所述的输入电抗器与电网电连接,所述的整流单元与输入电抗器电连接,所述的直流母线滤波与整流单元电连接,所述的逆变单元与直流母线滤波电连接,通过逆变单元得到交流电,所述的多输入端的电动机与逆变单元电连接；具有结构紧凑,系统效率高,性能优良的特点,解决了电磁之间的多次转换,提高了整个系统的效率；在逆变器和电机之间采用了多相结构,系统具有一定的冗余能力,当电机驱动系统中的电机或者逆变器的一相发生故障时,可以将其断开,系统仍可在运行而不必要停车,系统仍然能够继续工作,可靠性得到了很大提高。(A high-voltage variable frequency motor integrated device comprises an input reactor, a rectifying unit, a direct current bus filter, an inverting unit and a multi-input-end motor, and is characterized in that the input reactor is electrically connected with a power grid, the rectifying unit is electrically connected with the input reactor, the direct current bus filter is electrically connected with the rectifying unit, the inverting unit is electrically connected with the direct current bus filter, alternating current is obtained through the inverting unit, and the multi-input-end motor is electrically connected with the inverting unit; the system has the characteristics of compact structure, high system efficiency and excellent performance, solves the problem of multiple conversion between electromagnetism, and improves the efficiency of the whole system; a multi-phase structure is adopted between the inverter and the motor, the system has certain redundancy capability, when the motor in the motor driving system or one phase of the inverter fails, the motor can be disconnected, the system can still operate without stopping, the system can still continue to work, and the reliability is greatly improved.)

1. The integrated device of the high-voltage variable frequency motor comprises an input reactor (105), a rectifying unit (104), a direct current bus filter (103), an inverter unit (102) and a multi-input-end motor (101), and is characterized in that the input reactor (105) is electrically connected with a power grid, high voltage is introduced, the rectifying unit (104) is electrically connected with the input reactor (105), the direct current bus filter (103) is electrically connected with the rectifying unit (104), the inverter unit (102) comprises a preset number of inverter modules (1021), the preset number of inverter modules (1021) are connected in series, the inverter modules (1021) are arranged into a two-level circuit topological structure or a three-level inverter module structure, the inverter unit (102) is electrically connected with the direct current bus filter (103), a motor stator structure of the multi-input-end motor (101) comprises n three-phase coil windings, each group of the n-phase coil windings L, L, …, 5639 n, L1, L, … and L n-phase coil windings, wherein each group of the n-coil windings, O2, O23, O4 and n-phase coil windings are electrically connected with the multi-input ends of the multi-input-end motor (101).

2. The integrated device of the high-voltage variable frequency motor as claimed in claim 1, wherein the input reactor (105) is a three-phase common iron core reactor.

3. The integrated device of the high-voltage variable-frequency motor as claimed in claim 1, wherein the rectifying unit (104) is configured to be a three-phase fully-controlled rectifier and comprises a plurality of diodes connected in series, and RC voltage-sharing networks are connected to the diodes in parallel.

4. The integrated device of the high-voltage variable-frequency motor as claimed in claim 1, wherein the direct-current bus filter (103) comprises a plurality of groups of capacitors connected in series, each group of capacitors comprises a plurality of capacitors connected in parallel, and each group of capacitors is connected with a voltage-sharing resistor in parallel.

Technical Field

The invention relates to the technical field of power electronic power conversion, in particular to an integrated device of a high-voltage variable frequency motor.

Background

At present, the speed regulation of a high-voltage motor generally adopts a high-voltage frequency converter of a cascade multi-level technology, the high-voltage frequency converter is structurally realized by adopting a mode of connecting power units in series, and the high-voltage frequency converter is restricted by factors such as voltage level, module performance, production cost and the like, the volume of the high-voltage frequency converter adopting the structure is generally large, and meanwhile, one isolation phase-shifting transformer is arranged on the input side of the high-voltage frequency converter of the structure. From the frequency conversion speed regulation system of the whole high-voltage motor, the isolation phase-shifting transformer in the frequency converter performs primary electromagnetic conversion, and the motor also performs electromagnetic conversion, namely performs twice electromagnetic conversion, so that the efficiency of the whole system is relatively low. Meanwhile, in general, a certain distance exists between the motor and the frequency converter, the frequency converter is large in size and small in occupied area, system performance is reduced due to the existence of a connecting cable, and if long-distance frequency conversion power supply is adopted, the voltage of the motor end is too large, so that the service life of the motor is greatly influenced.

At present, the high-voltage frequency converter with high voltage generally adopts an H-bridge power module unit, the power unit has higher voltage grade after being cascaded, the cable connection between the power unit and the isolation phase-shifting transformer is more, the manufacturing of the high-voltage frequency converter is relatively complex, and great inconvenience is brought to production.

Disclosure of Invention

The integrated device of the high-voltage variable frequency motor is provided, and the integrated design of the high-voltage variable frequency motor can be realized through the change of a variable frequency electrical topological structure and the change of a winding of the common high-voltage motor, so that the efficiency of the whole system is improved, the size is reduced, the length of a cable is reduced, and the performance of the whole system is improved. In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a high-pressure inverter motor integral type device, includes input reactor, rectifier unit, direct current bus-bar filtering, contravariant unit and the motor of multiple input end, input reactor be connected with the electric wire netting electricity, introduce high-voltage electricity, rectifier unit be connected with input reactor electricity, obtain direct current bus-bar voltage after rectifier unit's rectification, direct current bus-bar filtering be connected with rectifier unit electricity, contravariant unit be connected with direct current bus-bar filtering electricity, obtain the alternating current through contravariant unit, the motor of multiple input end be connected with contravariant unit electricity.

Further, the input reactor is provided as a three-phase common core reactor.

Furthermore, the rectifying unit is set to be three-phase full-control rectifying and comprises a plurality of diodes which are connected in series, and RC voltage-sharing networks are connected on the diodes in parallel. Diodes used in rectification are connected in series, for example, diodes D1, D2, … and Dn are connected in series, the number of the diodes connected in series is calculated and determined by the voltage grade of the diodes, each diode is connected with an RC voltage-sharing network in parallel, for example, the diode D1 is connected with an RC voltage-sharing network formed by connecting R1 and CC1 in parallel, the diode D2 is connected with an RC voltage-sharing network formed by connecting R2 and CC2 in parallel, and the diode Dn is connected with an RC voltage-sharing network formed by connecting Rn and CCn in parallel, so that the static and dynamic voltage-sharing problems of the diodes after being connected in series can be effectively solved.

Further, the direct current bus filtering comprises a plurality of groups of capacitor sets connected in series, each capacitor set comprises a plurality of capacitors connected in parallel, and the capacitor sets are connected with voltage-sharing resistors in parallel. The direct current bus filtering is formed by connecting n groups of capacitor groups C11, C12, … and C1n in series, a plurality of capacitors are connected in parallel on each group of capacitor groups C11, C12, … and C1n, the number of the capacitors connected in parallel is determined by calculating the system capacity of a specific all-in-one machine, voltage-sharing resistors R11, R12, … and R1n are connected in parallel at two ends of each group of capacitor groups C11, C12, … and C1n, and the used capacitor groups are formed by connecting membrane capacitors in parallel.

Furthermore, the inversion unit comprises a preset number of inversion modules, the preset number of inversion modules are connected in series, and the inversion modules are arranged in a two-level circuit topology structure or a three-level inversion module structure. The inversion unit is formed by connecting n groups of inversion units in series by adopting n identical inversion modules in series for voltage division, the output of the inversion unit is provided with a main loop electrical topological structure with 3n paths of output, and the output end of the inversion unit is correspondingly connected to the power input end of the motor formed by 3n paths of windings. Each inverter module can adopt a two-level circuit topology structure, and can also adopt a three-level inverter module structure as shown in fig. 2, as shown in fig. 1, each inverter module adopts a three-bridge arm structure for output, the outputs of the power module are A1, B1 and C1, and in the bridge arm outputs of A1, B1 and C1, the fundamental wave output phases of the outputs are different by 120 degrees.

Furthermore, the stator structure of the multi-input motor comprises n three-phase coil windings, each group of the n coil windings L1, L2, …, L n, L1, L2, … and L n is connected in a star shape to form n star points O1, O2, … and On, the n star points are independent from each other and are not connected at all, the n coil windings L1, L2, … and L n are electrically isolated from each other, the coil windings of each group are formed by average stator winding segments of the same voltage and capacity, the number of the segments is greater than or equal to 4, and in the operation of the motor, the n coil windings On the stator of the motor jointly act to generate a rotating magnetic field inside the motor, so that the system torque performance is stable under the multi-phase driving, and the noise of the motor is low.

Compared with the prior art, the invention has the following beneficial effects: the high-voltage inverter has the characteristics of compact structure, high system efficiency and excellent performance, solves the problem of multiple conversion between electromagnetism, improves the efficiency of the whole system, solves the problems of limited output distance of the high-voltage inverter and interference of an output cable on peripheral equipment, and avoids the occurrence of motor insulation aging and even breakdown caused by overlarge voltage peak of a motor terminal due to long-distance level power supply; a multi-phase structure is adopted between the inverter and the motor, the system has certain redundancy capability, when the motor in the motor driving system or one phase of the inverter fails, the motor can be disconnected, the system can still operate without stopping, the system can still continue to work, and the reliability is greatly improved.

Drawings

The present invention is described in further detail below with reference to the attached drawings.

FIG. 1 is a schematic diagram of the electrical topology of the present invention;

FIG. 2 is a three-level inverter module topology in an inverter unit;

FIG. 3 is a schematic diagram of a connection of a multi-phase multi-segment winding coil formed by equally segmenting a three-phase winding coil of an electric machine;

in the drawings: 105. the motor comprises an input reactor, 104, a rectifying unit, 103, a direct current bus filter, 102, an inverter unit, 1021, an inverter module, 101 and a multi-input end.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described with reference to fig. 1, fig. 2, and fig. 3, and specific embodiments.

As shown in fig. 1, the high-voltage inverter motor integrated device includes an input reactor 105, a rectifying unit 104, a dc bus filter 103, an inverter unit 102, and a multi-input motor 101, where the input reactor 105 is electrically connected to a power grid to introduce high voltage, the rectifying unit 104 is electrically connected to the input reactor 105, and rectified by the rectifying unit 104 to obtain a dc bus voltage, the dc bus filter 103 is electrically connected to the rectifying unit 104, the inverter unit 102 is electrically connected to the dc bus filter 103, and an ac power is obtained by the inverter unit 102, and the multi-input motor 101 is electrically connected to the inverter unit 102.

Further, the input reactor 105 is provided as a three-phase common core reactor.

Further, the rectifying unit 104 is configured as a three-phase fully-controlled rectifier, and includes a plurality of diodes connected in series, and the diodes are all connected in parallel with an RC voltage-sharing network. Diodes used in rectification are connected in series, for example, diodes D1, D2, … and Dn are connected in series, the number of the diodes connected in series is calculated and determined by the voltage grade of the diodes, each diode is connected with an RC voltage-sharing network in parallel, for example, the diode D1 is connected with an RC voltage-sharing network formed by connecting R1 and CC1 in parallel, the diode D2 is connected with an RC voltage-sharing network formed by connecting R2 and CC2 in parallel, and the diode Dn is connected with an RC voltage-sharing network formed by connecting Rn and CCn in parallel, so that the static and dynamic voltage-sharing problems of the diodes after being connected in series can be effectively solved.

Further, the dc bus filter 103 includes a plurality of sets of capacitors connected in series, the capacitors include a plurality of capacitors connected in parallel, and the capacitors are all connected in parallel with a voltage-sharing resistor. The direct current bus filter 103 is formed by connecting n groups of capacitor groups C11, C12, … and C1n in series, a plurality of capacitors are connected in parallel on each group of capacitor groups C11, C12, … and C1n, the number of the capacitors connected in parallel is determined by calculating the system capacity of a specific all-in-one machine, voltage-sharing resistors R11, R12, … and R1n are connected in parallel at two ends of each group of capacitor groups C11, C12, … and C1n, and the used capacitor groups are formed by connecting membrane capacitors in parallel.

Further, the inversion unit 102 includes a preset number of inversion modules 1021, the preset number of inversion modules 1021 are connected in series, and the inversion modules 1021 are configured as a two-level circuit topology structure or a three-level inversion module structure. The inversion unit is formed by connecting n groups of inversion units in series by adopting n identical inversion modules in series for voltage division, the output of the inversion unit is provided with a main loop electrical topological structure with 3n paths of output, and the output end of the inversion unit is correspondingly connected to the power input end of the motor formed by 3n paths of windings. Each inverter module 1021 can adopt a two-level circuit topology structure, and can also adopt a three-level inverter module structure as shown in fig. 2, as shown in fig. 1, each inverter module 1021 adopts a three-bridge arm structure for output, outputs a1, B1 and C1 of the power module, and fundamental wave output phases of the outputs a1, B1 and C1 are different by 120 degrees.

Further, the stator structure of the multi-input motor 101 includes n three-phase coil windings, each group of the n coil windings L1, L2, …, L n, L1, L2, …, L n is connected in a star shape, and n star points O1, O2, …, On are formed, as shown in fig. 3, the n star points are independent of each other without any connection, and the n coil windings L1, L2, …, L n are electrically isolated from each other, the coil windings of each group are formed by equally dividing the stator windings with the same voltage and capacity, the number of divided sections is greater than or equal to 4, and in operation of the motor, the n coil windings On the stator of the motor cooperate to generate a rotating magnetic field inside the motor, so that the system torque performance is stable under multi-phase driving, and the noise of the motor is also small.

Compared with the prior art, the invention has the following beneficial effects: the high-voltage inverter has the characteristics of compact structure, high system efficiency and excellent performance, solves the problem of multiple conversion between electromagnetism, improves the efficiency of the whole system, solves the problems of limited output distance of the high-voltage inverter and interference of an output cable on peripheral equipment, and avoids the occurrence of motor insulation aging and even breakdown caused by overlarge voltage peak of a motor terminal due to long-distance level power supply; a multi-phase structure is adopted between the inverter and the motor, the system has certain redundancy capability, when the motor in the motor driving system or one phase of the inverter fails, the motor can be disconnected, the system can still operate without stopping, the system can still continue to work, and the reliability is greatly improved.

The technical solutions of the present invention or similar technical solutions designed by those skilled in the art based on the teachings of the technical solutions of the present invention are all within the scope of the present invention.