Multi-bridge-arm expandable combined type frequency converter

Abstract

The utility model discloses a multi-bridge-arm expandable combined type frequency converter, which has the following components and functions: a multi-bridge-arm combined type frequency converter unit has a frequency conversion function; the support capacitance expansion unit is used for providing capacitance capacity expansion for the frequency converter; the vector controller system realizes speed closed-loop control, unity power factor control, variable-frequency vector control, current closed-loop control and fault diagnosis functions; the LC filtering system is connected to the inlet wire side of the frequency converter to realize an inlet wire LC filtering function of the frequency converter; the incoming line control system is connected to the front end of the LC filtering system to realize on-off of a main incoming line of the frequency converter; the control power supply system provides a stable auxiliary control power supply for the frequency converter; the current and voltage acquisition system is used for acquiring incoming and outgoing line alternating current and voltage signals of the frequency converter; the heat dissipation system achieves a heat dissipation function on the frequency converter. The modular design is adopted, so that the overall product cost is greatly reduced, the space utilization rate is improved, the problem of difficulty in installation and maintenance is solved, and quick replacement and modular maintenance for faults are realized.

Description

Technical Field

[0001] The utility model relates to a multi-bridge arm expandable combined frequency converter for the ACD product series of quay crane control systems, belonging to the technical field of frequency converters. The ACD series products have dual meanings: one is an advanced control drive (advance control drive), and the other is an AC drive (AC is the abbreviation commonly used in the electrical industry for "alternating current", and D stands for drive). Background Art

[0002] Bridge cranes rely on a lifting mechanism and a horizontal motion mechanism to move in two perpendicular directions, allowing them to operate on rectangular sites. Port bridge cranes, commonly known as quay cranes, are essential equipment for port transportation. Their application in port transportation requires high load capacity, high reliability, and excellent operability.

[0003] With the increasing sophistication of AC inverter technology, traditional motor rotor series resistor and DC drive speed control methods used in port quay cranes have been gradually replaced by AC variable frequency drive speed control. Using AC inverters can greatly simplify electrical control circuits. AC inverters offer easy maintenance, adaptability to harsh operating conditions, low motor requirements, and excellent operational stability. They also offer high precision for port quay cranes, adapting to the ever-increasing control requirements of port cranes.

[0004] However, the existing AC inverter has the following shortcomings:

[0005] Since the loads of port bridge crane motors vary greatly, ranging from a few tons to hundreds of tons, inverter control requires the use of inverters with a variety of different power specifications to meet the complex application environment of the port. The diversified products will inevitably lead to a significant increase in subsequent spare parts maintenance costs. At the same time, most inverter manufacturers in the industry find it difficult to cover a wide range of power applications. Different products inevitably need to solve objective problems such as control logic, communication, and performance compatibility when applied. Summary of the Invention

[0006] In response to the shortcomings of the existing technology, the utility model provides a multi-bridge arm expandable combined inverter, which is mainly used in the ACD product series of quay crane control systems. Among them, the ACD series products have a dual meaning: one is an advanced control drive (advance control drive), and the other is an AC drive (AC is the abbreviation of "alternating current" commonly used in the electrical industry, and D stands for drive); through the different electrical connection combinations of 12 power devices and 4 bridge arms, a variety of variable combined inverter structures are realized. Without changing the space requirements, it can adapt to diverse application needs such as one-to-many port quay cranes or power expansion.

[0007] The utility model is implemented according to the following technical solutions:

[0008] The utility model provides a multi-bridge arm expandable combined inverter, including:

[0009] Cabinet, used to install electrical components;

[0010] A multi-bridge-arm combined inverter unit is installed in the cabinet and has a frequency conversion function;

[0011] A supporting capacitor expansion unit is installed in the cabinet and is used to provide capacitor capacity expansion for the inverter;

[0012] The vector controller system is installed in the cabinet and mainly realizes speed closed-loop control, unity power factor control, variable frequency vector control, current closed-loop control, and fault diagnosis functions;

[0013] The LC filter system is installed in the cabinet and connected to the inverter input side, mainly realizing the inverter input line LC filtering function;

[0014] The incoming line control system is installed in the cabinet and connected to the front end of the LC filter system, mainly realizing the on-off of the main incoming line of the inverter;

[0015] A control power supply system is installed in the cabinet to provide a stable auxiliary control power supply for the inverter;

[0016] The current and voltage acquisition system is installed in the cabinet and is used to collect the AC current and voltage signals of the input and output lines of the inverter.

[0017] In some embodiments, it further includes:

[0018] The heat dissipation system is mainly composed of a heat dissipation motor, an air duct, and a frame, which are respectively installed on the top surface and the rear side of the cabinet to realize the heat dissipation function of the inverter.

[0019] In some embodiments, the number of the multi-bridge-arm combined inverter units is three, and the three or more bridge-arm combined inverter units realize the use of one-to-two inverters or multiple sets of inverters.

[0020] In some embodiments, the multi-arm combined inverter unit includes:

[0021] Box, used to install electrical components;

[0022] A profiled radiator is fixed in the box to achieve heat dissipation for the bridge arm combined inverter unit;

[0023] A plurality of power devices are mounted on the profiled heat sink;

[0024] The embedded laminated busbar and the AC / DC laminated busbar are respectively connected and coordinated with the plurality of power devices to form a three-level topology loop;

[0025] A plurality of absorption capacitors are mounted on the profiled radiator and connected to the DC side of the AC / DC laminated busbar to suppress system overvoltage;

[0026] A quick-plug connector is connected to the DC side of the AC / DC laminated busbar, and an opening corresponding to the quick-plug connector is left on the side of the box;

[0027] The frequency converter control system is fixed in the box to realize the function control of the frequency converter system.

[0028] In some embodiments, a power device drive control board is also included, which is installed on the power device.

[0029] In some embodiments, the number of the multiple power devices is twelve, and the twelve power devices form four three-level bridge arms, wherein three bridge arms form a three-level rectifier or inverter with complete frequency conversion function, and one bridge arm is reserved for system redundancy; when the four bridge arms are connected in parallel in pairs, a two-fold power increase can be achieved; when the four bridge arms are connected in parallel, a four-fold capacity frequency conversion power expansion can be achieved.

[0030] In some embodiments, the supporting capacitor expansion unit includes a shell, multiple thin film capacitors, a DC stacked busbar and a quick plug connector; the multiple thin film capacitors, DC stacked busbar and quick plug connector are fixed on the shell to provide capacitor capacity expansion for the inverter system.

[0031] In some embodiments, the vector controller system includes:

[0032] Housing, used to install electrical components;

[0033] A control system mainboard is fixed in the housing;

[0034] A signal acquisition component, fixed in the housing, for collecting incoming line voltage signals;

[0035] a relay terminal assembly, fixed in the housing and used for controlling wiring;

[0036] A power control unit is fixed in the housing and is used for power control and external wiring;

[0037] The human-machine interface system is fixed on the outer side of the shell and is used to realize human-machine control.

[0038] In some embodiments, the LC filter system is mainly composed of a filter inductor, a filter capacitor, and a resistor, and the resistor is installed at the filter capacitor terminal; the incoming line control system is mainly composed of a main incoming line contactor for realizing the on and off of the main incoming line of the inverter and a pre-charging circuit for realizing the pre-charging of the inverter; the control power supply system is mainly composed of an auxiliary transformer, a switching power supply, and a wide-range power supply, and the auxiliary transformer is installed on the upper mounting plate of the filter inductor, and the switching power supply and wide-range power supply are installed on the top plate of the cabinet.

[0039] In some embodiments, the current and voltage acquisition system is mainly composed of multiple current sensors and multiple voltage sensors. The multiple current sensors are installed on the AC input and output terminals of the multi-arm combined inverter unit, and the multiple voltage sensors are installed on the top plate of the cabinet.

[0040] Beneficial effects of the utility model:

[0041] The utility model provides a multi-bridge-arm expandable combined inverter structure. Through different electrical connection combinations of 12 power devices and 4 bridge arms, a variety of variable combined inverter structures are realized. Without changing the space requirements, it can adapt to diversified application needs such as one-to-many port quay cranes or power expansion. The modular design greatly reduces the overall product cost, improves space utilization, solves the problems of difficult installation and maintenance, and realizes rapid modular replacement maintenance of faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0043] In the attached figure:

[0044] Figure 1 This is a schematic diagram of the overall structure of the multi-bridge arm expandable combined inverter of the utility model;

[0045] Figure 2 This is a schematic diagram of the overall structure of the multi-bridge arm combined inverter unit of the utility model;

[0046] Figure 3 This is a schematic diagram of the exploded multi-arm combined inverter unit of the present invention;

[0047] Figure 4 This is a schematic diagram of the overall structure of the support capacitor expansion unit of the present utility model;

[0048] Figure 5 This is a schematic diagram of the decomposition of the vector controller system of the present invention.

[0049] Figure symbols: multi-bridge combined inverter unit 1; supporting capacitor expansion unit 2; vector controller system 3; LC filter system 4; incoming line control system 5; heat dissipation system 8; cabinet 9;

[0050] Housing 101, profile heat sink 102, power device 103, power device drive control board 104, absorption capacitor 105, embedded laminated busbar 106, AC / DC laminated busbar 107, quick plug connector 108, inverter control system 109, lower side panel 110, upper side panel 111, cover 112;

[0051] Housing 201, film capacitor 202, DC laminated busbar 203, quick plug connector 204;

[0052] Housing 301, DSP+FPGA control system mainboard 302, signal acquisition component 303, relay terminal component 304, power supply control 305, human-machine interface system 306;

[0053] Auxiliary transformer 601, wide-band power supply 602;

[0054] Current sensor 701 and voltage sensor 702 .

[0055] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0057] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0058] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0059] like Figure 1 As shown, the multi-arm expandable combined inverter includes a multi-arm combined inverter unit 1, a supporting capacitor expansion unit 2, a vector controller system 3, an LC filter system 4, an incoming line control system 5, a control power supply system, a current and voltage acquisition system, a heat dissipation system 8 and a cabinet 9; the cabinet 9 is used to install electrical components; the multi-arm combined inverter unit 1 is installed in the cabinet 9 and has a frequency conversion function; the supporting capacitor expansion unit 2 is installed in the cabinet 9 and is used to provide capacitor capacity expansion for the inverter; the vector controller system 3 is installed in the cabinet 9 and mainly realizes speed closed-loop control, unity power factor control, variable frequency vector control, and current closed-loop control. Control and fault diagnosis functions; the LC filter system 4 is installed in the cabinet 9 and connected to the inverter incoming line side, mainly realizing the inverter incoming line LC filtering function; the incoming line control system 5 is installed in the cabinet 9 and connected to the front end of the LC filter system 4, mainly realizing the inverter main incoming line on and off; the control power supply system is installed in the cabinet 9 to provide a stable auxiliary control power supply for the inverter; the current and voltage acquisition system is installed in the cabinet 9 to collect the AC current and voltage signals of the inverter incoming and outgoing lines; the heat dissipation system 8 is mainly composed of a heat dissipation motor, an air duct, and a frame, which are respectively installed on the top and rear sides of the cabinet 9 to realize the heat dissipation function of the inverter.

[0060] The above-mentioned multi-arm combined inverter unit is further described below.

[0061] like Figure 2 、 Figure 3As shown, the multi-arm combined inverter unit includes a box 101, a profile heat sink 102, multiple power devices 103, a power device drive control board 104, multiple absorption capacitors 105, an embedded laminated bus 106, an AC / DC laminated bus 107, a quick plug connector 108, and an inverter control system 109; the profile heat sink 102 is fixed in the box to realize the heat dissipation function of the bridge arm combined inverter unit 1; multiple power devices 103 are installed on the profile heat sink 102; the embedded laminated bus 106, the AC / DC laminated bus 107 are respectively connected and cooperated with multiple power devices 103 to form a three-level topology loop; multiple absorption capacitors 105 are installed on the profile heat sink 102 and connected to the DC side of the AC / DC laminated bus 107 to suppress system overvoltage; the quick-plug connector 108 is connected to the DC side of the AC / DC laminated bus 107, and an opening corresponding to the quick-plug connector 108 is left on the side of the box; the inverter control system 109 is fixed in the box to realize the inverter system function control; the power device drive control board 104 is installed on the power device 103.

[0062] It should be noted that the box is a sealed structure, consisting of a U-shaped shell 101 and a lower plate 110, an upper plate 111 and a cover plate 112 mounted on the shell 101. The embedded laminated busbar 106 and the AC / DC laminated busbar 107 are composed of multiple layers of copper and insulating paper.

[0063] For further solutions, please refer to Figure 3 As shown, there are twelve power devices 103, each utilizing a three-level topology. These twelve power devices 103 form four three-level bridge arms. When used as a single inverter unit, the three bridge arms form a three-level rectifier or inverter with complete frequency conversion capabilities. One bridge arm is reserved for system redundancy, facilitating subsequent maintenance and overhaul. The three multi-bridge-arm combined inverter units enable the use of a one-to-two inverter or multiple inverters. When power expansion is required, the four bridge arms are connected in parallel, doubling the power output. The three multi-bridge-arm combined inverter units 1 form a complete three-level inverter. When the four bridge arms are connected in parallel, the three multi-bridge-arm combined inverter units 1 form a fully functional three-level rectifier or inverter, quadrupling the capacity of the frequency conversion power. By modifying the internal structure of the embedded laminated busbar 106 and the AC / DC laminated busbar 107, the twelve power devices 103 can achieve different electrical connection combinations for the four bridge arms.

[0064] The above-mentioned supporting capacitor expansion unit is further described below.

[0065] like Figure 4As shown, the supporting capacitor expansion unit 2 includes a shell 201, multiple thin film capacitors 202, a DC laminated busbar 203 and a quick plug connector 204; multiple thin film capacitors 202, the DC laminated busbar 203 and the quick plug connector 204 are fixed on the shell 201 to provide capacitor capacity expansion for the inverter system.

[0066] The above-mentioned vector controller system is further described below.

[0067] like Figure 5 As shown, the vector controller system 3 includes a housing 301, a DSP+FPGA control system mainboard 302, a signal acquisition component 303, a relay terminal component 304, a power supply control 305, and a human-machine interface system 306; the DSP+FPGA control system mainboard 302 is fixed in the housing 301, and can realize functions such as speed closed-loop control, unity power factor control, variable frequency vector control, current closed-loop control, and fault diagnosis; the signal acquisition component 303 is fixed in the housing 301 for collecting incoming voltage signals; the relay terminal component 304 is fixed in the housing 301, including electronic components such as relays and terminals, which are used for system auxiliary control and control wiring; the power supply control 305 is fixed in the housing 301, including electronic components such as circuit breakers, relays, and terminals, which are used for power control and external wiring of the DSP+FPGA structure vector controller system 3; the human-machine interface system 306 uses a touch screen and is fixed on the outer side of the housing 301 for realizing human-machine control.

[0068] The following further describes the above-mentioned LC filter system, incoming line control system, and control power supply system.

[0069] The LC filter system 4 includes a filter reactor, a filter capacitor, and a resistor, which are installed on the incoming line side of the inverter to realize the system incoming line LC filtering function. The resistor is installed at the terminal of the filter capacitor 402.

[0070] The incoming line control system 5 includes components such as the main incoming line contactor and the pre-charging circuit, and is installed at the front end of the LC filter system 4. The main incoming line contactor controls the main incoming line on and off, and the pre-charging circuit realizes the pre-charging of the inverter system.

[0071] The control power supply system 6 includes an auxiliary transformer 601, a switching power supply, and a wide-band power supply 602, providing stable auxiliary control power for the entire system. The auxiliary transformer 601 is mounted on the mounting plate above the filter reactor, while the switching power supply and wide-band power supply 602 are mounted on the cabinet top plate.

[0072] The above-mentioned current and voltage acquisition system is further described below.

[0073] The current and voltage acquisition system 7 includes multiple electronic devices such as current sensors 701 and voltage sensors 702. Multiple current sensors 701 are installed on the AC input and output ends of the multi-arm combined inverter unit 1 to collect the AC current signals of the system input and output lines. Multiple voltage sensors are installed on the top plate of the cabinet.

[0074] In summary, the utility model provides a multi-bridge-arm expandable combined inverter structure, which realizes a variety of variable combined inverter structures through different electrical connection combinations of 12 power devices and 4 bridge arms. Without changing the space requirements, it can adapt to diversified application needs such as one-to-many port quay cranes or power expansion. The modular design greatly reduces the overall product cost, improves space utilization, solves the problems of installation and maintenance difficulties, and realizes rapid replacement of faults and modular maintenance.

[0075] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0076] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0077] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. Multi-bridge arm expandable combined inverter, characterized by: include: Cabinet, used to install electrical components; A multi-bridge-arm combined inverter unit is installed in the cabinet and has a frequency conversion function; A supporting capacitor expansion unit is installed in the cabinet and is used to provide capacitor capacity expansion for the inverter; The vector controller system is installed in the cabinet and mainly realizes speed closed-loop control, unity power factor control, variable frequency vector control, current closed-loop control, and fault diagnosis functions; The LC filter system is installed in the cabinet and connected to the inverter input side, mainly realizing the inverter input line LC filtering function; The incoming line control system is installed in the cabinet and connected to the front end of the LC filter system, mainly realizing the on-off of the main incoming line of the inverter; A control power supply system is installed in the cabinet to provide a stable auxiliary control power supply for the inverter; The current and voltage acquisition system is installed in the cabinet and is used to collect the AC current and voltage signals of the input and output lines of the inverter.

2. The multi-arm expandable combined inverter according to claim 1, characterized in that: Also includes: The heat dissipation system is mainly composed of a heat dissipation motor, an air duct, and a frame, which are respectively installed on the top surface and the rear side of the cabinet to realize the heat dissipation function of the inverter.

3. The multi-arm expandable combined inverter according to claim 1, characterized in that: The number of the multi-bridge-arm combined inverter units is three, and the three multi-bridge-arm combined inverter units can realize the use of one-to-two inverters or multiple sets of inverters.

4. The multi-arm expandable combined inverter according to claim 1, characterized in that: The multi-bridge-arm combined inverter unit comprises: Box, used to install electrical components; A profiled radiator is fixed in the box to achieve heat dissipation for the bridge arm combined inverter unit; A plurality of power devices are mounted on the profiled heat sink; The embedded laminated busbar and the AC / DC laminated busbar are respectively connected and coordinated with the plurality of power devices to form a three-level topology loop; A plurality of absorption capacitors are mounted on the profiled radiator and connected to the DC side of the AC / DC laminated busbar to suppress system overvoltage; A quick-plug connector is connected to the DC side of the AC / DC laminated busbar, and an opening corresponding to the quick-plug connector is left on the side of the box; The frequency converter control system is fixed in the box to realize the function control of the frequency converter system.

5. The multi-arm expandable combined inverter according to claim 4, characterized in that: It also includes a power device drive control board card, which is installed on the power device.

6. The multi-arm expandable combined inverter according to claim 4, characterized in that: The number of the plurality of power devices is twelve, and the twelve power devices form four three-level bridge arms, wherein three bridge arms form a three-level rectifier or inverter with complete frequency conversion function, and one bridge arm is reserved for system redundancy; When the four bridge arms are connected in parallel, two by two, the power can be doubled; when the four bridge arms are connected in parallel, the frequency conversion power can be expanded by four times the capacity.

7. The multi-arm expandable combined inverter according to claim 1, characterized in that: The supporting capacitor expansion unit includes a housing, a plurality of film capacitors, a DC laminated busbar and a quick plug connector; The multiple film capacitors, DC laminated busbars and quick plug connectors are fixed on the housing to provide capacitance expansion for the inverter system.

8. The multi-bridge-arm expandable combined inverter according to claim 1, characterized in that: The vector controller system comprises: Housing, used for mounting electrical components; A control system mainboard is fixed in the housing; A signal acquisition component, fixed in the housing, for collecting incoming line voltage signals; a relay terminal assembly, fixed in the housing and used for controlling wiring; A power control unit is fixed in the housing and is used for power control and external wiring; The human-machine interface system is fixed on the outer side of the shell and is used to realize human-machine control.

9. The multi-arm expandable combined inverter according to claim 1, characterized in that: The LC filter system is mainly composed of a filter reactor, a filter capacitor, and a resistor, and the resistor is installed at the filter capacitor terminal; The incoming line control system mainly consists of a main incoming line contactor for realizing the on-off of the main incoming line of the frequency converter and a pre-charging circuit for realizing the pre-charging of the frequency converter; The control power supply system is mainly composed of an auxiliary transformer, a switching power supply, and a wide-range power supply. The auxiliary transformer is installed on the upper mounting plate of the filter reactor, and the switching power supply and the wide-range power supply are installed on the top plate of the cabinet.

10. The multi-arm expandable combined inverter according to claim 1, characterized in that: The current and voltage acquisition system is mainly composed of multiple current sensors and multiple voltage sensors. The multiple current sensors are installed on the AC input and output terminals of the multi-arm combined inverter unit, and the multiple voltage sensors are installed on the cabinet top plate.

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