CN106772045B - Micro-grid simulation variable-power asynchronous motor load experiment platform - Google Patents

Micro-grid simulation variable-power asynchronous motor load experiment platform Download PDF

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Publication number
CN106772045B
CN106772045B CN201611246142.1A CN201611246142A CN106772045B CN 106772045 B CN106772045 B CN 106772045B CN 201611246142 A CN201611246142 A CN 201611246142A CN 106772045 B CN106772045 B CN 106772045B
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China
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motor
dragging
power
asynchronous motor
plc
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CN106772045A (en
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张飞
王金明
李思泽
刘丕亮
任晓颖
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Inner Mongolia University of Science and Technology
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Inner Mongolia University of Science and Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34Testing dynamo-electric machines
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/058Safety, monitoring
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00Program-control systems
    • G05B2219/10Plc systems
    • G05B2219/16Plc to applications
    • G05B2219/163Domotique, domestic, home control, automation, smart, intelligent house

Abstract

The invention provides a micro-grid simulation variable power asynchronous motor load experiment platform, which belongs to the technical field of motors and comprises the following steps: the motor is to dragging platform, master control cabinet and adjustable resistance value's resistance cabinet, wherein, the motor include to dragging the platform: asynchronous motor, synchronous generator and shaft coupling, the main control cabinet include: the system comprises a PLC, a touch screen, a dragging motor soft starter and an electric energy quality test instrument; on the basis of simulating no-load and load operation of an asynchronous motor, the load power is set through a PLC; the device has the advantages of simple structure, good stability and reliability, convenient use, no complex operation program of the unit, zero-torque (zero-rotation speed) soft start, complete avoidance of impact on a power grid caused by the start of the unit, solving of loading operation only by controlling a touch screen to adjust resistance, and extremely convenient use; it can maintain extremely high stability over the full range of speeds (even at zero speed) and torques.

Description

Micro-grid simulation variable-power asynchronous motor load experiment platform
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a micro-grid load experiment platform for simulating a variable-power asynchronous motor.
Background
As a novel power grid structure, the micro-grid increases the flexibility of a system network on the basis of the traditional power network. When the micro-grid operates in parallel and off-grid, the asynchronous motor is used as a conventional load of the power grid. The scale and power ratio are large. The influence of asynchronous motor load on the micro-grid parallel-grid and off-grid running state and the transient process in the seamless switching connection process is researched. The load experiment device is developed particularly. The method has the advantages that the important purpose is to research, firstly, in the mode switching process of the micro-grid parallel-grid and off-grid, the voltage and frequency of the micro-grid are influenced by the reactive power excitation of the asynchronous motor; and the other is the problem of system energy feedback of asynchronous motor loads in the microgrid to the microgrid.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a micro-grid simulation variable power asynchronous motor load experiment platform, which simulates the electromagnetic transient process of a three-phase asynchronous motor load in the switching process of the micro-grid on and off the grid, comprises the no-load process of the asynchronous motor during actual operation and the starting, running and stopping processes of the asynchronous motor during loading, and can accurately reflect the influence of the actual running process of the whole motor on the transient process of the micro-grid; the motor protection device has an excellent motor protection function, and the motor system is protected by adding a soft start device and overvoltage protection.
A little electric wire netting simulation variable power asynchronous machine load experiment platform includes: the motor is to dragging platform, master control cabinet and adjustable resistance value's resistance cabinet, wherein, the motor include to dragging the platform: asynchronous motor, synchronous generator and shaft coupling, the main control cabinet include: the system comprises a PLC, a touch screen, a dragging motor soft starter and an electric energy quality test instrument;
the PLC is connected with the touch screen through a communication interface, a plurality of output ends of the PLC are respectively connected with the input end of the dragging motor soft starter and the input end of the resistance cabinet, and the electric energy quality test instrument is connected with the main circuit of the control cabinet and respectively measures voltage and current signals;
the output end of the soft starter of the dragging motor is connected with the input end of an asynchronous motor, the asynchronous motor is connected with a synchronous generator through a coupler, and the output end of the synchronous generator is connected with a resistor cabinet.
The apparatus also includes a security system comprising: safety chain latching relay, mushroom head scram switch, PLC controller watchdog and distribution power supply.
The main control cabinet is also provided with a switch, a contactor, a relay and a low-voltage apparatus.
The resistor cabinet comprises a plurality of resistors, and the discharge power interval is set to be 1kW by combining the access resistors through the keys according to the actual power detection requirement.
The invention has the advantages that:
the invention provides a micro-grid simulation variable power asynchronous motor load experiment platform, which is used for setting the load power through a PLC (programmable logic controller) on the basis of simulating no-load and load operation of an asynchronous motor; simple structure, stability, good reliability, convenient use, no complex operation program like the unit, zero-torque (zero-rotation speed) soft start, completely avoiding the impact on the power grid like the unit start, and solving the loading operation only by controlling the touch screen to adjust the resistance, and is extremely convenient to use. It can maintain extremely high stability over the full range of speeds (even at zero speed) and torques.
Drawings
Fig. 1 is a schematic structural diagram of a microgrid load experiment platform for simulating a variable power asynchronous motor according to an embodiment of the invention;
fig. 2 is a circuit diagram of a micro-grid simulation variable power asynchronous motor load experiment platform according to the present invention.
Detailed Description
An embodiment of the present invention will be further described with reference to the accompanying drawings.
In the embodiment of the present invention, as shown in fig. 1, a microgrid analog variable power asynchronous motor load experiment platform, a motor twin-trawling platform, a master control cabinet and a resistance cabinet with an adjustable resistance value, where the motor twin-trawling platform includes: asynchronous motor, synchronous generator and shaft coupling, the main control cabinet include: the system comprises a PLC, a touch screen, a dragging motor soft starter and an electric energy quality test instrument;
in the embodiment of the invention, the soft starter of the dragging motor adopts a JJ1000 model, is used for starting a squirrel-cage asynchronous motor, and can limit starting current and reduce voltage for starting; reducing the impact of starting current on a power grid; the vibration and noise of the equipment are reduced, and the service life of mechanical transmission is prolonged;
in the embodiment of the invention, the asynchronous motor adopts a Y2-180M-2 type dragging motor and is used for dragging a 20kW adjustable load; the addition of the soft start device can reduce the current impact caused by frequent start; after the three-phase asynchronous motor is completely started and after the bypass is softly started, a three-phase asynchronous motor feedback electric energy experiment of micro-grid power-on, power-off and grid-connected and off-grid switching can be carried out;
in the embodiment of the invention, the synchronous generator adopts the synchronous generator set, the performance is stable, the operation is reliable, and the maintenance amount is small;
in the embodiment of the invention, the resistor cabinet comprises a plurality of stainless steel resistors. The power of the resistor under the rated voltage is 1kW, 2kW, 5kW and 10kW respectively. Any power of 1-20 kW can be realized by different combinations, and the minimum resolution is 1 kW;
in the embodiment of the invention, the main control cabinet is provided with: a switch, a contactor, a relay, a low-voltage apparatus, a cabinet heater and illumination; the panel is arranged: instruments, switches, buttons, indicator lights and emergency stop buttons;
in the embodiment of the invention, the PLC adopts Siemens S7-1200 series PLC, is used for controlling the start and stop of a dragging motor, and starts the motor to a rated rotating speed by using a soft starting device; adjusting the rated power of the load, namely adjusting the power of the load by using a controllable resistance box;
in the embodiment of the invention, a main circuit power supply is three-phase 380V alternating current and is taken from a micro-grid and used for driving an asynchronous motor; the load size of the asynchronous motor is determined by the load resistance of the synchronous motor; the control power supply of the main control cabinet is 220V alternating current and is taken from the power distribution cabinet to supply power for the control system and the UPS; the PLC and the control circuit take power through the UPS, and can continuously and stably work in the process of power failure of the microgrid;
in the embodiment of the invention, the PLC is connected with the touch screen through a communication interface, a plurality of output ends of the PLC are respectively connected with the input end of a soft starter of a dragging motor and the input end of a resistance cabinet, and an electric energy quality measuring instrument is connected with a main circuit of a control cabinet and is used for respectively measuring a measuring voltage signal and a measuring current signal; fig. 2 is a schematic circuit diagram of the adjustable power load motor drag test platform according to the present invention;
in an embodiment of the present invention, the apparatus further includes a security system, including: the safety chain self-locking relay, the mushroom head emergency stop switch, the PLC controller watchdog and the power distribution power supply; the safety system is a link formed by connecting elements in series, the safety system is independently controlled and is not restricted by a unit control system, when the unit is activated by pressing down in an emergency stop, the relay cuts off the safety chain self-locking relay, and at the moment, the main power supply of the unit is cut off and needs to be reset by an operator; the unit safety system mainly has the functions: the system is ensured to be in a safe state, and the unit cannot be damaged due to foreseeable faults; the safety system action unit enters an emergency shutdown program, the emergency shutdown program triggers the dragging simulation motor to stop, and the power generation system carries out braking shutdown;
in the embodiment of the present invention, the security system is hierarchical, and generally divided into 2 levels: a primary security system and a secondary security system;
A. secondary security system
The action of the secondary safety system (namely the action of a safety chain self-locking relay triggers the secondary safety system) triggers a quick stop control program; the secondary safety system comprises overheating, power grid overvoltage and undervoltage protection;
B. primary security system
The primary safety system acts (namely the mushroom head emergency stop button acts to trigger the primary safety system) to trigger an emergency stop program; the functions are as follows: and the first-level safety system action unit enters an emergency shutdown program.

Claims (2)

1. The utility model provides a little electric wire netting simulation variable power asynchronous machine load experiment platform which characterized in that includes: the motor is to dragging platform, master control cabinet and adjustable resistance value's resistance cabinet, wherein, the motor include to dragging the platform: asynchronous motor, synchronous generator and shaft coupling, the main control cabinet include: the system comprises a PLC, a touch screen, a dragging motor soft starter and an electric energy quality test instrument;
the PLC is connected with the touch screen through a communication interface, a plurality of output ends of the PLC are respectively connected with the input end of the dragging motor soft starter and the input end of the resistance cabinet, and the electric energy quality test instrument is connected with the main control cabinet circuit and respectively measures voltage and current signals;
the output end of the soft starter of the dragging motor is connected with the input end of an asynchronous motor, the asynchronous motor is mechanically connected with a synchronous generator through a coupler, and the output end of the synchronous generator is connected with a resistor cabinet;
the resistor cabinet comprises a plurality of resistors, the resistors are connected through key combination according to actual power detection requirements, and the discharge power interval is set to be 1 kW;
the power supply of the main circuit is taken from a micro-grid and is used for driving an asynchronous motor; the PLC controller starts the asynchronous motor to a rated rotating speed by using the dragging motor soft starter to complete soft start, and after the dragging motor soft starter bypasses, a feedback electric energy experiment of micro-grid power-on, power-off and parallel switching is carried out.
2. The microgrid analog variable power asynchronous motor load experiment platform of claim 1, further comprising a safety system comprising: safety chain latching relay, mushroom head scram switch, PLC controller watchdog and distribution power supply.
CN201611246142.1A 2016-12-29 2016-12-29 Micro-grid simulation variable-power asynchronous motor load experiment platform Active CN106772045B (en)

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CN107390071A (en) * 2017-08-21 2017-11-24 上海交通大学 The simulation system of current-responsive type three-phase permanent magnet synchronous motor
CN109581217A (en) * 2017-09-28 2019-04-05 株洲变流技术国家工程研究中心有限公司 A kind of pilot system of permanent magnet coupling speed regulator
CN107645253A (en) * 2017-10-23 2018-01-30 上海交通大学 The three-phase simulation device of current-responsive type permagnetic synchronous motor and its drive system
CN108919115B (en) * 2018-05-15 2020-10-23 中国航发湖南动力机械研究所 Adjustable resistance load, loading system and loading method

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CN203204895U (en) * 2012-12-19 2013-09-18 沈阳工业大学 Moving die bidirectional wind power energy conversion experiment platform based on double-fed generator
CN104242762A (en) * 2014-10-14 2014-12-24 内蒙古科技大学 Double-fed wind power generator frequency closed-loop control experiment device and control method
CN104597893A (en) * 2014-12-23 2015-05-06 国电南瑞科技股份有限公司 Electric variable pitch testing system and method applicable to megawatt wind turbine generator
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