CN201352780Y - Undisturbed switching intelligent frequency control system for medium-voltage motor - Google Patents
Undisturbed switching intelligent frequency control system for medium-voltage motor Download PDFInfo
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- CN201352780Y CN201352780Y CNU2008201395588U CN200820139558U CN201352780Y CN 201352780 Y CN201352780 Y CN 201352780Y CN U2008201395588 U CNU2008201395588 U CN U2008201395588U CN 200820139558 U CN200820139558 U CN 200820139558U CN 201352780 Y CN201352780 Y CN 201352780Y
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Abstract
The utility model discloses an undisturbed switching intelligent frequency control system for a medium-voltage motor, which comprises a high-voltage frequency control system, a programmable logic controller, a water-resistance speed regulating system and the like, wherein when the high-voltage frequency control system has a fault, the programmable logic controller can control the undisturbed switching of the high-voltage frequency control system to the water-resistance speed regulating system, after the fault elimination, the programmable logic controller can reversely control the switching of the water-resistance speed regulating system (WRVS) to the high-voltage frequency control system (VVVFS) for running in an undisturbed mode, so the undisturbed speed regulation switching of the motor is realized, and the normal operation of the motor is maintained. In addition, the system has superior performance, high reliability, small control error, convenient and simple use, good man-machine interactive interface, flexible communication measure, realization of remote monitoring and management, high intelligent digitization degree, low cost, energy saving and environment protection.
Description
Technical field
The utility model relates to ac motor speed control control technology field, and relating in particular to a kind of middle voltage electromotor does not have disturbance switching intelligent frequency-conversion governing system.
Background technology
The mesohigh motor is widely used in dragging of blower fan and water pump, if can utilize speed governing to realize that air quantity and hydraulic pressure regulates, then can save a large amount of electric energy, so market is very vigorous to the demand of the moderate mesohigh governing system of function admirable, cost.With DSP, single-chip microcomputer etc. be the popularization and application of digital control chip of representative and middle and high shelves PLC control system go deep into the perfect day by day of Application and Development and Fuzzy Logic in Intelligent control strategy, for the digital intelligent chemical control system of middle pressure AC asynchronous motor speed governing lays the foundation.
In the ac motor speed control control system, existing high-power (＞press that (3～10KV) AC asynchronous motor governing systems mainly are divided into stator side frequency control and rotor-side tandem control two big classes in 200KW), the stator side frequency control is regulated rotating speed at motor stator side joint mesohigh frequency conversion speed-adjusting system by changing stator voltage and frequency.Converter technology reaches its maturity at present, and type is various, simply can be divided into universal frequency converter, and blower fan water pump energy-saving frequency converter and vector control high-performance transducer be not about the principle and the technology of frequency converter are set forth here.
Existing middle voltage electromotor frequency conversion speed-adjusting system mainly is to carry out speed governing to exchanging three-phase squirrel-cage induction motor, its frequency control characteristic good, and can realize soft start, in case but frequency converter breaks down, can only insert bypath system, frequency conversion system is disconnected, motor is done full speed running.Yet, in some production technology, do not allow the unexpected variation of motor speed, when the frequency conversion speed-adjusting system fault, motor must keep former rotating speed to continue operation.Therefore, can not realize undisturbed speed governing switching when existing middle voltage electromotor frequency conversion speed-adjusting system breaks down, its systematic function is poor, reliability is lower.
The utility model content
The utility model provides a kind of middle voltage electromotor not have disturbance switching intelligent frequency-conversion governing system, can not realize undisturbed speed governing switching, the problem that its systematic function and reliability are lower to solve existing middle voltage electromotor frequency conversion speed-adjusting system when breaking down.
For achieving the above object, the utility model embodiment provides a kind of middle voltage electromotor not have disturbance switching intelligent frequency-conversion governing system, bag middle voltage electromotor (M), high-voltage variable-frequency and variable-speed system (VVVFS), water resistance governing system (WRVS), the human-computer interaction interface touch-screen, supervisory control comuter and programmable logic controller (PLC) (PLC), described middle voltage electromotor (M) is connected with described water resistance governing system (WRVS) with described high-voltage variable-frequency and variable-speed system (VVVFS) respectively, described programmable logic controller (PLC) (PLC) respectively with described high-voltage variable-frequency and variable-speed system (VVVFS), described water resistance governing system (WRVS), described human-computer interaction interface touch-screen is connected with described supervisory control comuter, wherein, described programmable logic controller (PLC) (PLC) specifically comprises:
Information receiving module is used to receive the operation information of user by the input of human-computer interaction interface touch-screen, and described operation information comprises the given rotating speed of technology type, technological parameter and motor;
First judge module is used for when described information receiving module receives described operation information, judges whether described governing system is in normal operating conditions;
First control module, be used for when described first judge module judges that described governing system is in normal operating conditions, described operation information is carried out integrated treatment, generate first control signal and second control signal, and to described first control signal of high-voltage variable-frequency and variable-speed system (VVVFS) output, to described second control signal of water resistance governing system (WRVS) output, by the contact of described water resistance governing system (WRVS) according to the closed contactor 2KM of described second control signal, make the rotor loop short circuit of middle voltage electromotor (M), disconnect the contact of contactor 1KM, disconnect adjustable water resistor (WR), control described middle voltage electromotor (M) soft start to described given rotating speed according to described first control signal by described high-voltage variable-frequency and variable-speed system (VVVFS);
First follows module, is used for when described middle voltage electromotor (M) is in the variable frequency regulating speed control state, controls the rotation speed change that the resistance of described adjustable water resistor (WR) is followed described middle voltage electromotor (M);
First monitoring modular is used for according to the indication of described supervisory control comuter described high-voltage variable-frequency and variable-speed system (VVVFS) being carried out the running status remote monitoring, receives first monitoring information that described supervisory control comuter sends;
Second judge module is used for judging according to first monitoring information that described first monitoring modular receives whether the frequency converter (VVVF) of described high-voltage variable-frequency and variable-speed system (VVVFS) exists overcurrent, overvoltage and/or open-phase fault;
Second control module, be used for judging that when described second judge module there is overcurrent in the frequency converter (VVVF) of described high-voltage variable-frequency and variable-speed system (VVVFS), when overvoltage and/or open-phase fault, generate the 3rd control signal and the 4th control signal according to described first monitoring information, and to described the 3rd control signal of described high-voltage variable-frequency and variable-speed system (VVVFS) output, to described the 4th control signal of described water resistance governing system (WRVS) output, insert the bypath system of described high-voltage variable-frequency and variable-speed system (VVVFS) according to described the 3rd control signal by described high-voltage variable-frequency and variable-speed system (VVVFS), and by the contact of described water resistance governing system (WRVS) according to the closed described contactor 1KM of described the 4th control signal, disconnect the contact of described contactor 2KM, make the rotor loop of described middle voltage electromotor (M) insert described adjustable water resistor (WR), and, change water resistance speed governing state over to according to described first rotating speed of following the current given described middle voltage electromotor of resistance (M) of described adjustable water resistor (WR) that module follows with making the no disturbance of described middle voltage electromotor (M).
Middle voltage electromotor of the present utility model does not have disturbance and switches the intelligent frequency-conversion governing system, and described programmable logic controller (PLC) (PLC) also comprises:
Second follows module, is used for when described middle voltage electromotor (M) is in the rheostatic control state of a control, controls the rotation speed change that the frequency of described frequency converter (VVVF) is followed described middle voltage electromotor (M);
Second monitoring modular is used for according to the indication of described supervisory control comuter described high-voltage variable-frequency and variable-speed system (VVVFS) being carried out the malfunction remote monitoring, receives second monitoring information that described supervisory control comuter receives according to described monitoring result;
The 3rd judge module is used for judging according to second monitoring information that described second monitoring modular receives whether the fault of described frequency converter (VVVF) is recovered;
The 3rd control module, be used for when described the 3rd judge module judges that the fault of described frequency converter has been recovered, generate the 5th control signal and the 6th control signal according to described second monitoring information, and to described the 5th control signal of described high-voltage variable-frequency and variable-speed system (VVVFS) output, to described the 6th control signal of described water resistance governing system (WRVS) output, disconnect the bypath system of described high-voltage variable-frequency and variable-speed system (VVVFS) according to described the 5th control signal by described high-voltage variable-frequency and variable-speed system (VVVFS), insert described frequency converter (VVVF), and by the contact of described water resistance governing system (WRVS) according to the closed described contactor 2KM of described the 6th control signal, make the rotor loop short circuit of described middle voltage electromotor (M), disconnect the contact of described contactor 1KM, and, make the no disturbance of described middle voltage electromotor (M) ground oppositely switch back the frequency control state according to described second rotating speed of following the current given described middle voltage electromotor of frequency values (M) of described frequency converter (VVVF) that module follows.
Middle voltage electromotor of the present utility model does not have disturbance and switches the intelligent frequency-conversion governing system, and described programmable logic controller (PLC) (PLC) replaces with DSP+PLC or single-chip microcomputer+PLC.
Therefore, middle voltage electromotor of the present utility model does not have disturbance and switches the programmable logic controller (PLC) of intelligent frequency-conversion governing system in the control of implementing the high-voltage variable-frequency and variable-speed system operating state, regulate the resistance of the adjustable water resistor of water resistance governing system in real time according to the rotating speed of motor, when the high-voltage variable-frequency and variable-speed system fault, realize switching to the water resistance governing system by frequency conversion speed-adjusting system, and the rotating speed can switch to the water resistance governing system according to the given motor of the resistance of current described adjustable water resistor the time, and when changing the water resistance governing system over to, programmable logic controller (PLC) can be regulated the frequency of the frequency converter of high-voltage variable-frequency and variable-speed system again in real time according to the rotating speed of motor, after eliminating, the fault of frequency conversion speed-adjusting system can oppositely switch to the frequency conversion speed-adjusting system operation again, and the rotating speed can oppositely switch to frequency conversion speed-adjusting system according to the given motor of frequency values of the frequency converter of current described high-voltage variable-frequency and variable-speed system the time, thereby the no disturbance speed governing that realizes motor is switched, kept the normal operation of motor, and this systematic function is superior, the reliability height, departure is little, easy to use, has the good man-machine interaction interface, means of communication flexibly, can realize remote monitoring and management, the intelligent digital degree is high and with low cost, energy-conserving and environment-protective.
Description of drawings
Fig. 1 does not have the structural representation that the intelligent frequency-conversion governing system is switched in disturbance for the middle voltage electromotor of the utility model embodiment;
Fig. 2 is the apparatus structure schematic diagram of the programmable logic controller (PLC) of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail:
With reference to Fig. 1, the middle voltage electromotor of the utility model embodiment does not have disturbance and switches the intelligent frequency-conversion governing system, comprise middle voltage electromotor (M) 1, high-voltage variable-frequency and variable-speed system (VVVFS) 2, water resistance governing system (WRVS) 4, human-computer interaction interface touch-screen 6, supervisory control comuter 5 and programmable logic controller (PLC) (PLC) 3, described middle voltage electromotor (M) 1 is connected with described water resistance governing system (WRVS) 4 with described high-voltage variable-frequency and variable-speed system (VVVFS) 2 respectively, described programmable logic controller (PLC) (PLC) 3 respectively with described high-voltage variable-frequency and variable-speed system (VVVFS) 2, described water resistance governing system (WRVS) 4, described human-computer interaction interface touch-screen 6 is connected with described supervisory control comuter 5.
Wherein, described high-voltage variable-frequency and variable-speed system (VVVFS) 2 is used for described middle voltage electromotor (M) 1 is carried out variable frequency regulating speed control.Described programmable logic controller (PLC) (PLC) 3 is used for controlling described high-voltage variable-frequency and variable-speed system (VVVFS) 2 no disturbances when described high-voltage variable-frequency and variable-speed system (VVVFS) 2 faults and switches to described water resistance governing system, and the reverse described water resistance governing system (WRVS) 4 of controlling switches to described high-voltage variable-frequency and variable-speed system (VVVFS) 2 operations with having disturbance again after fault is eliminated.Described water resistance governing system (WRVS) 4 is used for described middle voltage electromotor (M) 1 is carried out rheostatic control control.Described supervisory control comuter 5 is used for the running status by 3 pairs of described high-voltage variable-frequency and variable-speed systems of described programmable logic controller (PLC) (PLC) (VVVFS) 2, and faults such as overcurrent, overvoltage, overheated and phase shortage carry out remote monitoring and demonstration, export monitoring information to human-computer interaction interface touch-screen 6 by described programmable logic controller (PLC) (PLC) 3 simultaneously and carry out this locality and show and report to the police.Described human-computer interaction interface touch-screen 6 is used to the user that the controlling platform of operations such as processing parameter setting, controller type selection is provided, and various parameters can show on touch-screen, and being undertaken by programmed logic controller (PLC) 3 alternately of information.
With reference to figure 2, in the utility model embodiment, middle voltage electromotor does not have the programmable logic controller (PLC) (PLC) 3 that the intelligent frequency-conversion governing system is switched in disturbance, specifically comprises:
First follows module 304, is used for when described middle voltage electromotor (M) 1 is in the variable frequency regulating speed control state, and the resistance of controlling described adjustable water resistor (WR) 4 is followed the rotation speed change of described middle voltage electromotor (M) 1.
First monitoring modular 305 is used for according to the indication of described supervisory control comuter 5 described high-voltage variable-frequency and variable-speed system (VVVFS) 2 being carried out the running status remote monitoring, receives first monitoring information that described supervisory control comuter 5 sends.
In another embodiment of the present utility model, the programmable logic controller (PLC) (PLC) that middle voltage electromotor does not have disturbance switching intelligent frequency-conversion governing system can also comprise:
Second follows module 308, is used for when described middle voltage electromotor (M) 1 is in the rheostatic control state of a control, and the frequency of controlling described frequency converter (VVVF) is followed the rotation speed change of described middle voltage electromotor (M) 1.
Second monitoring modular 309 is used for according to the indication of described supervisory control comuter 5 described high-voltage variable-frequency and variable-speed system (VVVFS) 2 being carried out the malfunction remote monitoring, receives second monitoring information that described supervisory control comuter 5 receives according to described monitoring result.
The 3rd judge module 310 is used for judging according to second monitoring information that described second monitoring modular 309 receives whether the fault of described frequency converter (VVVF) is recovered.
The 3rd control module 311, be used for when described the 3rd judge module 310 judges that the fault of described frequency converter has been recovered, generate the 5th control signal and the 6th control signal according to described second monitoring information, and to described the 5th control signal of described high-voltage variable-frequency and variable-speed system (VVVFS) 2 outputs, to described the 6th control signal of described water resistance governing system (WRVS) 4 outputs, disconnect the bypath system of described high-voltage variable-frequency and variable-speed system (VVVFS) 2 according to described the 5th control signal by described high-voltage variable-frequency and variable-speed system (VVVFS) 2, insert described frequency converter (VVVF), and by the contact of described water resistance governing system (WRVS) 4 according to the closed described contactor 2KM of described the 6th control signal, make the rotor loop short circuit of described middle voltage electromotor (M) 1, disconnect the contact of described contactor 1KM, and according to described second rotating speed of following the current given described middle voltage electromotor of frequency values (M) 1 of described frequency converter (VVVF) that module 308 follows, described middle voltage electromotor (M) 1 no disturbance ground oppositely switches back the frequency control state.
Need to prove, it will be appreciated by those skilled in the art that the module in the device in the foregoing description can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
In addition, the middle voltage electromotor of the utility model embodiment does not have disturbance and switches the programmable logic controller (PLC) (PLC) 3 of intelligent frequency-conversion governing system and can adopt the medium-to-high grade SIMATIC S7-300 of Siemens or the PLC of SIMATIC S7-400 series.Therefore, utilize the excellent properties of SIMATIC S7 series cooperate ingenious programming can implement to system control flexibly, the effective protection and the warning of fault.Wherein, programmable logic controller (PLC) (PLC) also can replace with DSP+PLC or single-chip microcomputer+PLC, middle voltage electromotor (M) 1 can be wire wound asynchronous motor, be provided with adjustable water resistor (WR) in the water resistance governing system (WRVS) 4, contactor 1KM and 2KM, and water resistance governing system (WRVS) 4 is also replaceable to be that cast iron becomes the resistance system, programmable logic controller (PLC) (PLC) 3 is provided with the CAN bus, RS232/RS485 communication interface and IP communication interface can realize communications with supervisory control comuter 5 by RS232/RS485 communication interface and/or CAN fieldbus and/or IP interface.
Middle voltage electromotor of the present utility model does not have disturbance and switches the intelligent frequency-conversion governing system after start powers on, and programmable logic controller (PLC) (PLC) 3 starts initialization subroutine self is carried out initialization, makes The whole control system be in the preparation state.The user can pass through human-computer interaction interface touch-screen 6 input operation information, as the given rotating speed etc. of input technology type, technological parameter and motor.After the information receiving module 301 of programmable logic controller (PLC) (PLC) 3 receives described operation information then, trigger first judge module 302 and judge whether governing system is in normal operating conditions.When described first judge module 302 judges that described governing system is in normal operating conditions, 303 pairs of described operation informations of first control module carry out integrated treatment, generate first control signal and second control signal, and to described first control signal of high-voltage variable-frequency and variable-speed system (VVVFS) 2 outputs, to described second control signal of water resistance governing system (WRVS) 4 outputs, by the contact of described water resistance governing system (WRVS) 4 according to the closed contactor 2KM of described second control signal, make the rotor loop short circuit of middle voltage electromotor (M) 1, disconnect the contact of contactor 1KM, disconnect adjustable water resistor (WR), control described middle voltage electromotor (M) 1 soft start to described given rotating speed according to described first control signal by described high-voltage variable-frequency and variable-speed system (VVVFS) 2.(otherwise described first judge module 302 is proceeded judgement next time.
After this, work under the high-voltage variable-frequency and variable-speed system state of a control at middle voltage electromotor (M) 1, first resistance of following the water resistor of 304 pairs of water resistance governing systems of module (WRVS) 4 is controlled, and makes it the rotation speed change of the current middle voltage electromotor of real-time tracking (M) 1.During this period, supervisory control comuter 5 carries out the running status remote monitoring by 305 pairs of described high-voltage variable-frequency and variable-speed systems of first monitoring modular (VVVFS) 2, generates first monitoring information, and described first monitoring information is sent to described first monitoring modular 305.Then, second judge module 306 judges according to first monitoring information that described first monitoring modular 305 receives whether the frequency converter (VVVF) of described high-voltage variable-frequency and variable-speed system (VVVFS) 2 exists overcurrent, overvoltage and/or open-phase fault.
When described second judge module 306 judges that there is overcurrent in the frequency converter (VVVF) of described high-voltage variable-frequency and variable-speed system (VVVFS) 2, when overvoltage and/or open-phase fault, described second control module 307 generates the 3rd control signal and the 4th control signal according to described first monitoring information, and to described the 3rd control signal of described high-voltage variable-frequency and variable-speed system (VVVFS) 2 outputs, to described the 4th control signal of described water resistance governing system (WRVS) 4 outputs, insert the bypath system of described high-voltage variable-frequency and variable-speed system (VVVFS) 2 according to described the 3rd control signal by described high-voltage variable-frequency and variable-speed system (VVVFS) 2, and by the contact of described water resistance governing system (WRVS) 4 according to the closed described contactor 1KM of described the 4th control signal, disconnect the contact of described contactor 2KM, make the rotor loop of described middle voltage electromotor (M) 1 insert described adjustable water resistor (WR), and, change water resistance speed governing state over to according to described first rotating speed of following the current given described middle voltage electromotor of resistance (M) 1 of described adjustable water resistor (WR) that module 304 follows with making described middle voltage electromotor (M) 1 no disturbance.(otherwise described second judge module 306 is proceeded to judge next time.)
After this, work under the water resistance governing system state of a control at middle voltage electromotor (M) 1, second frequency of following the module 308 described frequency converters of control (VVVF) is followed the rotation speed change of described middle voltage electromotor (M) 1.At this moment, described monitoring computer 5 begins to carry out the malfunction remote monitoring by 309 pairs of described high-voltage variable-frequency and variable-speed systems of second monitoring modular (VVVFS) 1, generates second monitoring information, and described second monitoring information is sent to described second monitoring modular 305.Then, the 3rd judge module 310 judges according to second monitoring information that described second monitoring modular 309 generates whether the fault of described frequency converter (VVVF) is recovered.
When described the 3rd judge module 310 judges that the fault of described frequency converter has been recovered, the 3rd control module 311 generates the 5th control signal and the 6th control signal according to described second monitoring information, and to described the 5th control signal of described high-voltage variable-frequency and variable-speed system (VVVFS) 2 outputs, to described the 6th control signal of described water resistance governing system (WRVS) 4 outputs, disconnect the bypath system of described high-voltage variable-frequency and variable-speed system (VVVFS) 2 according to described the 5th control signal by described high-voltage variable-frequency and variable-speed system (VVVFS) 2, insert described frequency converter (VVVF), and by the contact of described water resistance governing system (WRVS) 4 according to the closed described contactor 2KM of described the 6th control signal, make the rotor loop short circuit of described middle voltage electromotor (M) 1, disconnect the contact of described contactor 1KM, and according to described second rotating speed of following the current given described middle voltage electromotor of frequency values (M) 1 of described frequency converter (VVVF) that module 308 follows, described middle voltage electromotor (M) 1 no disturbance ground oppositely switches back the frequency control state.(otherwise described the 3rd judge module 310 is proceeded to judge next time.)
Middle voltage electromotor of the present utility model does not have disturbance switching intelligent frequency-conversion governing system and is suitable for middle conventional wound asynchronous motor and the middle pressure cage internal feedback brushless motor of pressing.
Middle voltage electromotor of the present utility model does not have disturbance and switches the programmable logic controller (PLC) of intelligent frequency-conversion governing system in the control of implementing the high-voltage variable-frequency and variable-speed system operating state, regulate the resistance of the adjustable water resistor of water resistance governing system in real time according to the rotating speed of motor, when the high-voltage variable-frequency and variable-speed system fault, realize switching to the water resistance governing system by frequency conversion speed-adjusting system, and the rotating speed can switch to the water resistance governing system according to the given motor of the resistance of current described adjustable water resistor the time, and when changing the water resistance governing system over to, programmable logic controller (PLC) can be regulated the frequency of the frequency converter of high-voltage variable-frequency and variable-speed system again in real time according to the rotating speed of motor, after eliminating, the fault of frequency conversion speed-adjusting system can oppositely switch to the frequency conversion speed-adjusting system operation again, and the rotating speed can oppositely switch to frequency conversion speed-adjusting system according to the given motor of frequency values of the frequency converter of current described high-voltage variable-frequency and variable-speed system the time, thereby the no disturbance speed governing that realizes motor is switched, kept the normal operation of motor, and this systematic function is superior, the reliability height, departure is little, easy to use, has the good man-machine interaction interface, means of communication flexibly, can realize remote monitoring and management, the intelligent digital degree is high and with low cost, energy-conserving and environment-protective.
Above embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model all should fall in the definite protection range of claims of the present utility model.
Claims (3)
1, a kind of middle voltage electromotor does not have disturbance and switches the intelligent frequency-conversion governing system, comprise middle voltage electromotor (M), high-voltage variable-frequency and variable-speed system (VVVFS), water resistance governing system (WRVS), the human-computer interaction interface touch-screen, supervisory control comuter and programmable logic controller (PLC) (PLC), described middle voltage electromotor (M) is connected with described water resistance governing system (WRVS) with described high-voltage variable-frequency and variable-speed system (VVVFS) respectively, described programmable logic controller (PLC) (PLC) respectively with described high-voltage variable-frequency and variable-speed system (VVVFS), described water resistance governing system (WRVS), described human-computer interaction interface touch-screen is connected with described supervisory control comuter, it is characterized in that described programmable logic controller (PLC) (PLC) specifically comprises:
Information receiving module is used to receive the operation information of user by the input of human-computer interaction interface touch-screen, and described operation information comprises the given rotating speed of technology type, technological parameter and motor;
First judge module is used for when described information receiving module receives described operation information, judges whether described governing system is in normal operating conditions;
First control module, be used for when described first judge module judges that described governing system is in normal operating conditions, described operation information is carried out integrated treatment, generate first control signal and second control signal, and to the described control signal of high-voltage variable-frequency and variable-speed system (VVVFS) output, to described second control signal of water resistance governing system (WRVS) output, by the contact of described water resistance governing system (WRVS) according to the closed contactor 2KM of described second control signal, make the rotor loop short circuit of middle voltage electromotor (M), disconnect the contact of contactor 1KM, disconnect adjustable water resistor (WR), control described middle voltage electromotor (M) soft start to described given rotating speed according to described first control signal by described high-voltage variable-frequency and variable-speed system (VVVFS);
First follows module, is used for when described middle voltage electromotor (M) is in the variable frequency regulating speed control state, controls the rotation speed change that the resistance of described adjustable water resistor (WR) is followed described middle voltage electromotor (M);
First monitoring modular is used for according to the indication of described supervisory control comuter described high-voltage variable-frequency and variable-speed system (VVVFS) being carried out the running status remote monitoring, receives first monitoring information that described supervisory control comuter sends;
Second judge module is used for judging according to first monitoring information that described first monitoring modular receives whether the frequency converter (VVVF) of described high-voltage variable-frequency and variable-speed system (VVVFS) exists overcurrent, overvoltage and/or open-phase fault;
Second control module, be used for judging that when described second judge module there is overcurrent in the frequency converter (VVVF) of described high-voltage variable-frequency and variable-speed system (VVVFS), when overvoltage and/or open-phase fault, generate the 3rd control signal and the 4th control signal according to described first monitoring information, and to described the 3rd control signal of described high-voltage variable-frequency and variable-speed system (VVVFS) output, to described the 4th control signal of described water resistance governing system (WRVS) output, insert the bypath system of described high-voltage variable-frequency and variable-speed system (VVVFS) according to described the 3rd control signal by described high-voltage variable-frequency and variable-speed system (VVVFS), and by the contact of described water resistance governing system (WRVS) according to the closed described contactor 1KM of described the 4th control signal, disconnect the contact of described contactor 2KM, make the rotor loop of described middle voltage electromotor (M) insert described adjustable water resistor (WR), and, change water sun speed governing state over to according to described first rotating speed of following the current given described middle voltage electromotor of resistance (M) of described adjustable water resistor (WR) that module follows with making the no disturbance of described middle voltage electromotor (M).
2, middle voltage electromotor according to claim 1 does not have disturbance switching intelligent frequency-conversion governing system, it is characterized in that described programmable logic controller (PLC) (PLC) also comprises:
Second follows module, is used for when described middle voltage electromotor (M) is in the rheostatic control state of a control, controls the rotation speed change that the frequency of described frequency converter (VVVF) is followed described middle voltage electromotor (M);
Second monitoring modular is used for according to the indication of described supervisory control comuter described high-voltage variable-frequency and variable-speed system (VVVFS) being carried out the malfunction remote monitoring, receives second monitoring information that described supervisory control comuter receives according to described monitoring result;
The 3rd judge module is used for judging according to second monitoring information that described second monitoring modular receives whether the fault of described frequency converter (VVVF) is recovered;
The 3rd control module, be used for when described the 3rd judge module judges that the fault of described frequency converter has been recovered, generate the 5th control signal and the 6th control signal according to described second monitoring information, and to described the 5th control signal of described high-voltage variable-frequency and variable-speed system (VVVFS) output, to described the 6th control signal of described water resistance governing system (WRVS) output, disconnect the bypath system of described high-voltage variable-frequency and variable-speed system (VVVFS) according to described the 5th control signal by described high-voltage variable-frequency and variable-speed system (VVVFS), insert described frequency converter (VVVF), and by the contact of described water resistance governing system (WRVS) according to the closed described contactor 2KM of described the 6th control signal, make the rotor loop short circuit of described middle voltage electromotor (M), disconnect the contact of described contactor 1KM, and, make the no disturbance of described middle voltage electromotor (M) ground oppositely switch back the frequency control state according to described second rotating speed of following the current given described middle voltage electromotor of frequency values (M) of described frequency converter (VVVF) that module follows.
3, do not have disturbance according to the described middle voltage electromotor of claim 1 and switch the intelligent frequency-conversion governing system, it is characterized in that described programmable logic controller (PLC) (PLC) is replaceable to be DSP+PLC or single-chip microcomputer+PLC.
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| CNU2008201395588U CN201352780Y (en) | 2008-10-24 | 2008-10-24 | Undisturbed switching intelligent frequency control system for medium-voltage motor |
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| CNU2008201395588U CN201352780Y (en) | 2008-10-24 | 2008-10-24 | Undisturbed switching intelligent frequency control system for medium-voltage motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488727B (en) * | 2008-10-24 | 2011-04-27 | 广东华拿东方能源有限公司 | Undisturbed switching variable frequency speed control system for medium voltage electric motor and speed control method |
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2008
- 2008-10-24 CN CNU2008201395588U patent/CN201352780Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488727B (en) * | 2008-10-24 | 2011-04-27 | 广东华拿东方能源有限公司 | Undisturbed switching variable frequency speed control system for medium voltage electric motor and speed control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20091125 Effective date of abandoning: 20081024 |