Control system for balancing crane power by utilizing energy storage power supply

Abstract

The utility model discloses a control system for balancing crane power by utilizing energy storage power supply, which comprises a power supply trunk line, an energy storage power supply branch line and electric equipment, the electric equipment is connected on the power supply trunk line and is positioned at the power utilization end of the power supply trunk line, the energy storage power supply branch line and the power supply trunk line are arranged in parallel, and the energy storage power supply branch line is connected with the power supply trunk line. The energy storage power supply branch line is located between the power supply end and the power utilization end of the power supply trunk line. The energy storage power supply branch line charges the energy storage device when the energy consumption power is low, and supplies power cooperatively when the energy consumption power is high, so that normal operation of equipment is guaranteed, the capacity parameters and specifications of main power loop components are reduced, and the manufacturing cost of the equipment is greatly reduced; and meanwhile, the energy storage device is used for locally storing the electric energy fed back by the motor inversion of each working mechanism without being fed back to a power supply network, so that the waste of the feedback electric energy is avoided, and meanwhile, the harmonic pollution of the feedback electric energy is also avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to crane energy supply technical field, concretely relates to a control system of utilizing energy storage power supply balanced crane power. BACKGROUND

[0002] In recent years with the progress of technology, electric crane power drive system generally adopts frequency conversion drive technology, taking gantry crane as an example, crane each mechanism main work flow is: three-phase alternating current rectifier inverter - DC common bus - each work mechanism inverter drive each work mechanism motor.Crane work mechanism mainly has hoisting mechanism, rotating mechanism and luffing mechanism, each mechanism can work independently, also can work jointly;Crane each mechanism motor is intermittent work system, and works intermittently in a crane work cycle.

[0003] At present, electric crane main power circuit each component specification selection mainly basis each work mechanism motor rated power total, that is total power, for example, incoming line high voltage cable, transformer, switch cabinet, low voltage cable, rectifier inverter etc.When selection, in order to guarantee operation safety, the electric energy power of main power circuit operation will select the maximum value as design power, the above-mentioned mode not only causes main power circuit component capacity parameter to be big, but also component specification is higher, also greatly improves the manufacturing cost of equipment.In addition, the existing technology adopts frequency conversion inverter technology to reduce the electric energy consumption, but due to a part of electric energy will be inverted and fed back to the power supply network, the feedback electric energy not only cannot be effectively utilized, simultaneously, due to the feedback electric energy harmonic pollution is serious, also increases the burden of power grid management.The utility model provides a kind of control system of utilizing energy storage power supply balanced crane power to solve the above problems. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of control system of utilizing energy storage power supply balanced crane power, and parallel connection energy storage power supply branch line is set on power supply trunk line, which reduces the design power when selection, and avoids the pollution of feedback electric energy harmonic.

[0005] The utility model solves the above technical problems by the technical scheme that:

[0006] A kind of control system of utilizing energy storage power supply balanced crane power, including power supply trunk line, energy storage power supply branch line and electric equipment, the electric equipment is connected on power supply trunk line, and the electric equipment is located at the output end of power supply trunk line, the energy storage power supply branch line is connected in parallel with power supply trunk line, and the energy storage power supply branch line is located between the power supply end and the output end of power supply trunk line;

[0007] The energy storage power supply branch line comprises an energy storage control subsystem, a first energy storage subsystem and a second energy storage subsystem, the first energy storage subsystem and the second energy storage subsystem are connected to the power supply trunk line and are both in parallel with the power supply trunk line, the energy storage control subsystem is connected with the first energy storage subsystem and the second energy storage subsystem and controls the first energy storage subsystem and the second energy storage subsystem.

[0008] Further, the first energy storage subsystem comprises a first energy storage device and a first charger, the first energy storage device and the first charger are connected in series, the input end of the first charger is connected to the power supply trunk line, the output end of the first energy storage device is connected to the power supply trunk line, the second energy storage subsystem comprises a second energy storage device and a second charger, the second energy storage device and the second charger are connected in series, the input end of the second charger is connected to the power supply trunk line, the output end of the second energy storage device is connected to the power supply trunk line, and the energy storage control subsystem is connected with the first charger and the second charger.

[0009] Further, the power supply trunk line comprises a power supply control device, a power supply main line and a direct current common bus, the power supply control device comprises a transformer, a control switch and a rectifier inverter, the transformer, the control switch and the rectifier inverter are connected in series in front of and behind the power supply trunk line, the front side of the rectifier inverter is the power supply main line, the rear side of the rectifier inverter is the direct current common bus, the input end of the first energy storage subsystem is connected to the power supply main line, the output end of the first energy storage subsystem is connected to the direct current common bus, and the second energy storage subsystem is connected in parallel with the direct current common bus.

[0010] Further, the rectifier inverter is located in front of the second energy storage subsystem.

[0011] Further, the electric equipment is composed of a plurality of electric appliances, the plurality of electric appliances are connected in parallel on the power supply trunk line, and the electric appliances comprise an inverter and a power mechanism, and the inverter and the power mechanism are connected in series.

[0012] Preferably, the first energy storage device and the second energy storage device are super capacitor modules.

[0013] The utility model discloses the beneficial effect is as follows:

[0014] The energy storage power supply branch line charges the energy storage device when the energy utilization power is low, and cooperates to supply power when the energy utilization power is high, so that the normal operation of the equipment is ensured, the capacity parameters and specifications of the active power circuit components are reduced, and the equipment manufacturing cost is greatly reduced; meanwhile, the energy storage device stores the feedback electric energy of the motor inverter of each working mechanism locally, and does not need to feedback to the power supply network, which avoids the waste of feedback electric energy and the pollution of feedback electric energy harmonics. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The energy control system overall structure schematic view of the utility model;

[0016] Figure 2 The prior art energy supply system structure schematic view.

[0017] The figure mark: 1, the power supply trunk line;11, the transformer;12, the control switch;13, the rectifier inverter;14, the power supply main circuit;15, the DC common bus;2, the energy storage power supply branch line;21, the energy storage control subsystem;22, the first energy storage device;23, the first charger;24, the second energy storage device;25, the second charger;3, the electric equipment. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings of the specification, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0019] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0020] As Figure 1 The utility model discloses a control system that utilizes energy storage power supply to balance crane power, including power supply trunk line 1, energy storage power supply branch line 2 and electric equipment 3, electric equipment 3 is connected on power supply trunk line 1, electric equipment 3 is located at the output end of power supply trunk line 1, energy storage power supply branch line 2 is parallelly connected with power supply trunk line 1, and energy storage power supply branch line 2 is located between the power supply end and the output end of power supply trunk line 1.

[0021] Energy storage power supply branch line 2 includes energy storage control subsystem 21, first energy storage subsystem and second energy storage subsystem, and first energy storage subsystem and second energy storage subsystem are connected on power supply trunk line 1 and are parallelly connected with power supply trunk line 1, and energy storage control subsystem 21 is connected with first energy storage subsystem and second energy storage subsystem and controls first energy storage subsystem and second energy storage subsystem.

[0022] As Figure 1As shown, the energy storage power supply branch line 2 comprises two groups of energy storage subsystems to improve the flexibility of the energy control system of the crane, the two groups of energy storage subsystems are connected in parallel with the power supply trunk line 1, the parallel connection enables the two groups of energy storage subsystems to supply energy simultaneously with the power supply trunk line 1, or only through the power supply trunk line 1, the two groups of energy storage subsystems are controlled by the energy storage control subsystem 21, and the energy storage and energy supply of the two groups of energy storage subsystems are controlled by the energy storage control subsystem 21. When the first energy storage subsystem needs to store energy, the energy is stored through the power supply main circuit 14 under the control of the energy storage control subsystem 21, the energy storage source of the second energy storage subsystem has two parts, one part is the electric energy output by the rectifier inverter 13 to the DC common bus 15, and the other part is the electric energy generated by the lifting motor during the heavy load descent of the lifting mechanism of the crane and the rotation and amplitude changing motor and fed back to the DC common bus 15 through the inverter, the second energy storage subsystem collects and stores the above two parts of electric energy, and the feedback electric energy collected by the second energy storage subsystem not only solves the problem of waste caused by the fact that the feedback electric energy cannot be used, but also avoids the problem of harmonic pollution when the feedback electric energy of the electric equipment 3 enters the DC common bus 15. When supplying energy, due to the parallel connection of the first energy storage subsystem, the second energy storage subsystem and the power supply trunk line 1, the three can supply energy simultaneously, the total power supply is improved, and the working requirements of the crane are met. Since the first energy storage subsystem and the second energy storage subsystem supply energy synchronously, the actual electric energy power in the power supply main circuit 14 is greatly reduced compared with the design power, the specifications of the main power circuit components are greatly reduced, and the equipment manufacturing cost is greatly reduced.

[0023] The energy storage process is as follows: when the motor of the lifting mechanism of the electric crane is working, the energy storage control subsystem 21 sends a disconnecting instruction to the first charger 23 to stop charging the first energy storage device 22; when the lifting work stops, the energy storage control subsystem 21 sends a running instruction to the first charger 23 to charge and store energy in the first energy storage device 22 until it is fully charged; when the motor of the lifting mechanism is working under heavy load or the motors of the amplitude changing mechanism and the rotating mechanism are working under deceleration, the second charger 25 works to charge and store energy in the second energy storage device 24 by using the feedback electric energy, and the second energy storage device 24 is charged to full capacity by the rectifier inverter 13 on the DC common bus 15.

[0024] The energy supply process is as follows: when the motor of the lifting mechanism of the electric crane is working under heavy load and the three mechanisms of the equipment are working simultaneously, the rectifier inverter 13, the first energy storage device 22 and the second energy storage device 24 output electric energy to the DC common bus 15 simultaneously to meet the power requirements of the equipment working.

[0025] As Figure 1As shown, further, the first energy storage subsystem includes a first energy storage device 22 and a first charger 23, which are connected in series, the input end A of the first charger 23 is connected to the power supply main line 14, and the output end B of the first energy storage device 22 is connected to the DC common bus 15. The second energy storage subsystem is located at the rear side of the rectifier inverter 13, including a second energy storage device 24 and a second charger 25, which are connected in series, the input end D of the second charger 25 is connected to the DC common bus 15, and the output end C of the second energy storage device 24 is connected to the DC common bus 15. The energy storage control subsystem 21 is connected with the first charger 23 and the second charger 25, and controls the first charger 23 to charge the first energy storage device 22 and the second charger 25 to charge the second energy storage device 24.

[0026] Further, the second charger 25 of the second energy storage subsystem is located at the side of the electrical equipment 3, that is, the rectifier inverter 13 is located at the front side of the second energy storage device 24, so as to charge the second energy storage device 24 through the DC common bus 15, and the second charger 25 is located at the rear side of the second energy storage device 24, so as to utilize the feedback power of the inverter of the electrical equipment 3 by the second energy storage device 24.

[0027] As shown, Figure 1 Further, the power supply trunk 1 includes a power supply control device, a power supply main line 14 and a DC common bus 15. The power supply control device includes a transformer 11, a control switch 12 and a rectifier inverter 13, which are connected in series at the front and rear of the power supply trunk 1. The power supply trunk 1 is divided into two parts by the rectifier inverter 13, the front side of the rectifier inverter 13 is the power supply main line 14, and the rear side of the rectifier inverter 13 is the DC common bus 15. The input end of the first energy storage subsystem is connected to the power supply main line 14, the output end of the first energy storage subsystem is connected to the DC common bus 15, and the second energy storage subsystem is connected in parallel with the DC common bus 15.

[0028] Further, the electrical equipment 3 is composed of multiple groups of electrical appliances, which are connected in parallel on the DC common bus 15. The electrical appliances include inverters and power mechanisms, which are one-to-one corresponding and connected in series.

[0029] Preferably, the power mechanism includes one amplitude-changing motor, two rotating motors and two lifting motors.

[0030] Preferably, the first energy storage device 22 and the second energy storage device 24 are super capacitor modules.

[0031] As shown, Figure 2As shown, in the prior art, the motor specifications of each mechanism of a certain type of 40-ton gantry crane are as follows: the luffing motor has a working system S3-FC=40%=90KW, the rotating motor has a working system S3-FC=40%=75KW, two sets are provided and the total installed capacity is 150KW, the hoisting motor has a working system S3-FC=60%=300KW, two sets are provided and the total installed capacity is 600KW, and the total design power is 840KW.

[0032] When the total design power of 840KW is supplied by the power supply main line 14, the device selection of the power supply main line 14 is as follows: the on-site 10KV high-voltage cable has a specification of 3*35, the 10KV transformer has a specification of 1000KVA, the 440V three-phase alternating current cable has a specification of 185 cables 2 per phase, and the rectifier inverter has a specification of 400KW*2=800KW.

[0033] In the embodiment, the rectifier inverter 13 on the power supply main line 1 of the 40-ton gantry crane is selected to have a specification of 400KW, and the main devices of the energy storage power supply branch line 2 are selected as follows: the first energy storage device 22 and the second energy storage device 24 are selected to have a specification of super capacitor module, the first energy storage device 22 has a specification of 200KW, the second energy storage device 24 has a specification of 200KW, and the energy storage control subsystem 21 is selected to have a specification of PLC programmable controller.

[0034] In the embodiment, when the gantry crane is running, the motor of each mechanism operates in the power generation state during the heavy load descent of the hoisting mechanism or the deceleration operation of the luffing mechanism and the rotating mechanism, the inverter is fed back to the direct current common bus 15, the energy storage control subsystem 21 controls the second charger 25 to work, and the feedback power is used to charge and store energy for the second energy storage device 24; during the hoisting mechanism hoisting stop working, the rectifier inverter 13 on the power supply main line 1 charges the second energy storage device 24 to a full power state, and the energy storage control subsystem 21 controls the first charger 23 to work to charge the first energy storage device 22 to a full power state.

[0035] When the hoisting mechanism is hoisting or the hoisting mechanism, the luffing mechanism and the rotating mechanism are jointly working, the device consumes a large power, the energy storage power supply branch line 2 stops storing energy and changes to a power supply state, and the rectifier inverter 13, the first energy storage device 22 and the second energy storage device 24 jointly supply power with an output power of 400KW+200KW+200KW=800KW, which meets the power requirement of the device.

[0036] When in non-load or standby state, the power consumption of each mechanism motor is far less than 400kw, the first energy storage subsystem and the rectifier inverter 13 are connected in parallel, and the power consumption is not greater than 400kw, so the devices on the power supply main circuit 14 are selected according to 400kw: 10KV cable on the machine-specification 3*25, 10KV transformer-specification 500KVA, three-phase AC 440V cable-one root of each phase 185 cable; rectifier inverter 13-specification 400KW. Compared with the prior art, the capacity parameter is reduced by 50%.

[0037] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application, and any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A control system for equalizing the power of a hoist using stored energy, characterized by: The power supply trunk (1), the energy storage power supply branch (2) and the electric equipment (3) are connected, the electric equipment (3) is connected to the power supply trunk (1), the electric equipment (3) is located at the output end of the power supply trunk (1), the energy storage power supply branch (2) is connected in parallel with the power supply trunk (1), and the energy storage power supply branch (2) is located between the power supply end and the output end of the power supply trunk (1); The energy storage power supply branch (2) comprises an energy storage control subsystem (21), a first energy storage subsystem and a second energy storage subsystem, the first energy storage subsystem and the second energy storage subsystem are connected to the power supply trunk (1) and are connected in parallel with the power supply trunk (1), and the energy storage control subsystem (21) is connected with the first energy storage subsystem and the second energy storage subsystem and controls the first energy storage subsystem and the second energy storage subsystem.

2. The control system for balancing the power of the hoist by using the stored energy according to claim 1, characterized in that: The first energy storage subsystem comprises a first energy storage device (22) and a first charger (23), the first energy storage device (22) and the first charger (23) are connected in series, the input end of the first charger (23) is connected to the power supply trunk (1), the output end of the first energy storage device (22) is connected to the power supply trunk (1), the second energy storage subsystem comprises a second energy storage device (24) and a second charger (25), the second energy storage device (24) and the second charger (25) are connected in series, the input end of the second charger (25) is connected to the power supply trunk (1), and the output end of the second energy storage device (24) is connected to the power supply trunk (1); the energy storage control subsystem (21) is connected with the first charger (23) and the second charger (25).

3. The control system for equalizing power of a hoist using stored energy according to claim 2, wherein: the control system is characterized by: The power supply trunk (1) comprises a power supply control device, a power supply main circuit (14) and a direct current common bus (15), the power supply control device comprises a transformer (11), a control switch (12) and a rectifier inverter (13), the transformer (11), the control switch (12) and the rectifier inverter (13) are connected in series in front of and behind the power supply trunk (1), the front side of the rectifier inverter (13) is the power supply main circuit (14), the rear side of the rectifier inverter (13) is the direct current common bus (15), the input end of the first energy storage subsystem is connected to the power supply main circuit (14), the output end of the first energy storage subsystem is connected to the direct current common bus (15), and the second energy storage subsystem is connected in parallel with the direct current common bus (15).

4. The control system for equalizing power of a hoist using stored energy according to claim 3, wherein: The rectifier inverter (13) is located in front of the second energy storage subsystem.

5. The control system for equalizing power of a hoist using stored energy according to claim 1, wherein: the control system is characterized by: The electric equipment (3) is composed of a plurality of groups of electric appliances, the plurality of groups of electric appliances are connected in parallel with each other on the power supply trunk (1), the electric appliances comprise an inverter and a power mechanism, and the inverter and the power mechanism are connected in series.

6. The control system for equalizing power of a hoist using stored energy according to claim 2, wherein: The first energy storage device (22) and the second energy storage device (24) are super capacitor modules.

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