CN105450134A - Intelligent harmonic-elimination high-power-factor high-voltage stator voltage regulating and speed adjusting device and method - Google Patents
Intelligent harmonic-elimination high-power-factor high-voltage stator voltage regulating and speed adjusting device and method Download PDFInfo
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- CN105450134A CN105450134A CN201510022281.5A CN201510022281A CN105450134A CN 105450134 A CN105450134 A CN 105450134A CN 201510022281 A CN201510022281 A CN 201510022281A CN 105450134 A CN105450134 A CN 105450134A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides an intelligent harmonic-elimination high-power-factor high-voltage stator voltage regulating and speed adjusting device. The device comprises a high-voltage switch cabinet, a transformer, a digital high-voltage stator voltage regulating and speed adjusting system, a harmonic detection unit, a higher harmonic filter, a reactive compensation controller, and control and protection units. The voltage regulating and speed adjusting system adopts a scheme that phase angle control of a silicon controlled rectifier assembly of a stator and rotor resistance switching control of a motor are combined. The voltage regulating and speed adjusting system is further connected with two branches: the harmonic detection unit and a magnetic control reactor. The harmonic detection unit and the magnetic control reactor are respectively connected with the higher harmonic filter and the reactive compensation controller, and the control and protection units are respectively arranged in the two branches. The intelligent harmonic-elimination high-power-factor high-voltage stator voltage regulating and speed adjusting device solves the problems of time delay and a low response speed which are caused by adjustment is only carried out after excessive harmonics and idle work, the speed adjusting control is energy saving, high in efficiency, high dynamic and high in precision, and the non-pollution requirement is met.
Description
Technical field
The present invention relates to variable voltage control electrical drive control system technical field, be specifically related to a kind of Intelligent resonance suppression wave height power factor high voltage stator pressure-speed regulating device and method.
Background technology
Industrial cousumer improves the user side quality of power supply to being contemplated to be of electrical network, improving power consumption efficiency and reduce electric energy loss.But the application of large-scale power electronic installation, non-linear power electronic device, large-scale impact load etc., cause the voltage fluctuation of electrical network, flickering, produce a large amount of harmonic waves, cause that power factor is low, three-phase imbalance etc., this brings very serious baneful influence to electric power system and power consumption equipment.Due to harmonic source and the dispersiveness of the reactive source causing power factor to reduce, electric power system is relied on to concentrate harmonic carcellation source and provide reactive power source to be impossible, therefore, unification of the motherland defines the permissible range of each spaced point voltage, frequency offset magnitude, harmonic wave allowed band, the power factor systems of rewards and penalties etc., make power supply department and user need to configure all kinds of reactive power compensation and harmonic wave eliminating device in decentralized manner.
High-voltage large-capacity asynchronous motor is the most basic meritorious and one of reactive power consumption source, its speed regulating device are also one of topmost harmonic sources in electric power system, at present conventional all kinds of reactive power compensation, harmonic wave eliminating equipment reduce the harmonic wave of its speed regulating device and motor reactive power to the pollution of electrical network, these equipment volume are large, heavy, expensive, add high-voltage large-capacity asynchronous motor operating cost, simultaneously, due to their adjustment be exceed standard based on harmonic wave and reactive power after dynamic compensation, the problems such as life period is delayed, response speed is slow.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for above-mentioned existence, one is provided to integrate multiple functions such as harmonic wave eliminating, dynamic passive compensation and variable voltage control, there is cost low, floor space is little, high dynamic characteristic and high accuracy, and its operation is minimum to the pollution of electrical network, be widely used in running to ultralow harmonic wave and High Power Factor the Intelligent resonance suppression wave height power factor high voltage stator pressure-speed regulating device and the method that have the asynchronous motor of requirement.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of Intelligent resonance suppression wave height power factor high voltage stator pressure-speed regulating device, include high-tension switch cabinet, transformer, digital high-voltage stator variable voltage speed control system, harmonic detecting unit, high-order harmonic filtering device, idle compensating control and control and protection unit, it is characterized in that: described pressure and speed regulating system takes the scheme that the Phase angle control of the silicon controlled component of stator and motor Switch Rotor resistance control to combine, in-60% ~+60% scope of setting speed, the continuous velocity had nothing to do by closed-loop control realization and load is regulated, accelerated by opened loop control Switch Rotor resistance beyond this scope, described closed-loop control includes current detecting unit, speed preset unit, ramp function generator, speed control, current follower, current controller, door control unit, Application of Motor Speed Detecting unit, described pressure and speed regulating system is also connected to harmonic detecting unit and magnet controlled reactor two branch roads, harmonic detecting unit and magnet controlled reactor are connected to high-order harmonic filtering device and idle compensating control, and are provided with control and protection unit in two branch roads.
Above-mentioned Intelligent resonance suppression wave height power factor high voltage stator pressure-speed regulating device is utilized to carry out the method for variable voltage control, it is characterized in that: when speed regulating device output current, according to the Mathematical Modeling set up in advance and operating mode, synchronously dropped into the harmonic wave eliminating amount and reactive power compensation amount that pre-determine and need to drop into by control and protection unit and idle compensating control; The harmonic wave simultaneously produced whole speed regulating device under motor real-time working condition and actual power factor are measured, and carry out dynamic flexible regulate compensation rate by controlling the control of reactive power compensating unit; When the unusual conditions such as harmonic current abnormal increase, voltage, current anomaly being detected, by the vacuum circuit-breaker of control and protection unit excision high-tension switch cabinet, excision magnet controlled reactor (MCR) and fixing filter branch (FC) respectively compensate branch road.
In such scheme, described harmonic detecting unit is made up of analog-to-digital conversion module and dsp chip, load current is measured by current transformer, digital signal is transformed into through analog-to-digital conversion module, then send the fast fourier transformation algorithm process of dsp chip, obtain the size of first-harmonic and other harmonic components; Harmonic filter (FC) is made up of 2 group of 5 subharmonic filter branch L5, C5 and 5,5 and 1 group of 7 subharmonic filter branch L7, C7, each harmonic props up route reactor and capacitor (capacitance is C) is composed in series, the equivalent resistance R of reactor is very small, inductance value L is also very small, thus whole harmonic filter (FC) send idle in capacitive.Filter is to n(ω n=n ω s, ω s is fundamental frequency) impedance of subharmonic is Zn=Rn+ (jn ω sLn+1/jn ω sCn), at the resonance place of nth harmonic, Zn=Rn, because Rn is very little, nth harmonic electric current is shunted primarily of Rn, seldom flows in electrical network, namely achieves the compensation to nth harmonic.
In such scheme, the method of described variable voltage control includes the connection of transformer, the connection adopted adopts delta connection for having side winding at least, the transformer of this connection itself can eliminate 3 subharmonic, so do not consider 3 subharmonic filtering problems, by measuring, what its harmonic components was higher is 5 subharmonic, and 7 subharmonic secondly, high-order harmonic filtering device only needs to compensate 5 times and 7 subharmonic just can realize harmonic carcellation, harmonic detecting unit is by Real-Time Monitoring harmonic wave, its abnormal to increase time provide alarm signal by control and protection unit and high-tension switch cabinet surgical filtering branch road.
In such scheme, described high-order harmonic filtering device (FC) to 5 times, 7 subharmonic compensate, the harmonic current of filtering appts, unnecessary capacity provides capacitive reactive power for system, magnet controlled reactor (MCR) provides continuously dynamically adjustable perception idle for system, idle compensating control adopts the full-digital intelligent based on DSP to control, and comprises data acquisition unit and the control of reactive power compensating unit, idle compensating control follows the tracks of load variations (current controller detecting pressure and speed regulating system exports iCZ) by data acquisition unit, the idle Q(of measuring system detects phase voltage u, phase current i), and input to Mathematical Modeling that DSP sets up in advance and the control of reactive power compensating algorithm and carry out process and obtain reactive power compensation amount, then by the control of reactive power compensating unit, regulate the angle of flow of MCR energized circuit thyristor, the degree of saturation of real-time adjustment magnet controlled reactor, thus regulate its perceptual output capacity, reactive capability Q dynamic equilibrium needed for guarantee system, realize the flexible compensation of dynamic reactive.
The Mathematical Modeling of DSP is the forecast model set up with the corresponding relation of the reactive power compensation amount of following MCR according to historical datas such as the current i CZ of pressure and speed regulating system output and the idle Q of system, in the process of this plant running, detect this model of operating mode correction by real-time, the control of reactive power compensating algorithm is followed the tracks of the change of this model and is adopted predictive control algorithm to export reactive power compensation amount in real time simultaneously.
Control and protection unit adopts Microcomputer Protection, comprises quick-break, overcurrent, overvoltage, under-voltage, unbalance protection, harmonic wave transfinite protection, possess self diagnostic capability simultaneously.
In such scheme, described magnet controlled reactor (MCR) adopts the designing technique of magnetic path parallel connection leakage self-shielding magnetic circuit and auto-coupling direct current magnetism-assisting circuit, and iron core adopts the close undersaturated symmetrical fissions structure of magnetic, and winding adopts connect in parallel with upside and downside bilateral symmetry.Adopt the low-voltage thyristor of high reliability, only bear 1% ~ 2% of system voltage, thyristor adopts the nature type of cooling.
In such scheme, system triggers isopulse signal all adopts optical fiber to carry out, and triggering mode adopts photoelectricity triggering mode.Safe and reliable, antijamming capability is strong.
Beneficial effect of the present invention is:
The present invention is compared with existing all kinds of external reactive power compensation, harmonic wave eliminating equipment, solve harmonic wave and idle exceed standard after the problem such as time lag, the response speed of just carrying out regulating be slow, speed regulating control is had energy-conservation, efficient, high dynamic and high-precision feature, meets the operation of country to large-scale electric equipment to the substantially free of contamination requirement of electrical network.
Accompanying drawing explanation
Fig. 1 is overall loop control theory figure of the present invention;
Fig. 2 is harmonic wave eliminating of the present invention, Dynamic Reactive Power Compensation Principle figure;
Fig. 3 is the fundamental diagram of idle compensating control of the present invention and magnet controlled reactor;
In figure: 1 governing system, 2 harmonic detecting unit, 3 idle compensating controls, 4 control and protection unit.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated:
The wave height of Intelligent resonance suppression shown in Fig. 1 power factor high voltage stator pressure-speed regulating device; include high-tension switch cabinet, transformer, digital high-voltage stator variable voltage speed control system 1, harmonic detecting unit 2, high-order harmonic filtering device (FC), idle compensating control 3 and control and protection unit 4, wherein governing system 1 takes the scheme that the Phase angle control of the silicon controlled component of stator and motor Switch Rotor resistance control to combine.In-60% ~+60% scope of setting speed, the continuous velocity had nothing to do by closed-loop control realization and load is regulated, and is accelerated beyond this scope by opened loop control Switch Rotor resistance.Closed-loop control is made up of current detecting unit, speed preset unit, ramp function generator, speed control, current follower, current controller, door control unit 1, Application of Motor Speed Detecting unit.From static to the accelerator of full speed running, be first closed loop control process, send signal by speed preset unit through ramp function generator, its size determines the rotating speed size of motor.The feedback signal of Setting signal and Application of Motor Speed Detecting unit is subtracted each other, i.e. Δ U=U
give -U
instead , its difference DELTA U delivers to speed control, current follower forms follow current, then with detect current unit
icompare, obtain through current regulator
i cZ, then deliver to the trigger end of pulse to silicon controlled component that door control unit exports certain phase shift, silicon controlled component then exports certain voltage, and the rotating speed of motor and set-point are adapted.When rotating speed reach setting speed-60% ~+60% beyond time, remove closed-loop control, opened loop control makes motor accelerate to setting speed by Switch Rotor resistance.Described pressure and speed regulating system is also connected to harmonic detecting unit 2 and magnet controlled reactor two branch roads; Harmonic detecting unit 2 and magnet controlled reactor are connected to high-order harmonic filtering device and idle compensating control 3, and are provided with control and protection unit 4 in two branch roads.
In the present embodiment, above-mentioned Intelligent resonance suppression wave height power factor high voltage stator pressure-speed regulating device is utilized to carry out the method for variable voltage control for shown in Fig. 2, when speed regulating device output current, according to the Mathematical Modeling set up in advance and operating mode, synchronously dropped into the harmonic wave eliminating amount and reactive power compensation amount that pre-determine and need to drop into by control and protection unit and idle compensating control 3; The harmonic wave simultaneously produced whole speed regulating device under motor real-time working condition and actual power factor are measured, and carry out dynamic flexible regulate compensation rate by controlling idle compensating control 3; When the unusual conditions such as harmonic current abnormal increase, voltage, current anomaly being detected, excised the vacuum circuit-breaker of high-tension switch cabinet by control and protection unit 4, excision magnet controlled reactor (MCR) and fixing filter branch (FC) respectively compensate branch road.
Shown in Fig. 2, described harmonic detecting unit 2 is made up of analog-to-digital conversion module and dsp chip, measures load current, be transformed into digital signal through analog-to-digital conversion module by current transformer, then send the fast fourier transformation algorithm process of dsp chip, obtain the size of first-harmonic and other harmonic components; Harmonic filter (FC) is made up of 2 group of 5 subharmonic filter branch L5, C5 and 5,5 and 1 group of 7 subharmonic filter branch L7, C7, each harmonic props up route reactor and capacitor (capacitance is C) is composed in series, the equivalent resistance R of reactor is very small, inductance value L is also very small, thus whole harmonic filter (FC) send idle in capacitive.Filter is to n(ω n=n ω s, ω s is fundamental frequency) impedance of subharmonic is Zn=Rn+ (jn ω sLn+1/jn ω sCn), at the resonance place of nth harmonic, Zn=Rn, because Rn is very little, nth harmonic electric current is shunted primarily of Rn, seldom flows in electrical network, namely achieves the compensation to nth harmonic.
In the present embodiment case, described high-order harmonic filtering device (FC) to 5 times, 7 subharmonic compensate, the harmonic current of filtering appts, unnecessary capacity provides capacitive reactive power for system, magnet controlled reactor (MCR) provides continuously dynamically adjustable perception idle for system, idle compensating control 3 adopts the full-digital intelligent based on DSP to control, and comprises data acquisition unit and the control of reactive power compensating unit, idle compensating control 3 follows the tracks of load variations (current controller detecting pressure and speed regulating system exports iCZ) by data acquisition unit, the idle Q(of measuring system detects phase voltage u, phase current i), and input to Mathematical Modeling that DSP sets up in advance and the control of reactive power compensating algorithm and carry out process and obtain reactive power compensation amount, then by the control of reactive power compensating unit, regulate the angle of flow of MCR energized circuit thyristor, the degree of saturation of real-time adjustment magnet controlled reactor, thus regulate its perceptual output capacity, reactive capability Q dynamic equilibrium needed for guarantee system, realize the flexible compensation of dynamic reactive.
The Mathematical Modeling of DSP is the forecast model set up with the corresponding relation of the reactive power compensation amount of following MCR according to historical datas such as the current i CZ of pressure and speed regulating system output and the idle Q of system, in the process of this plant running, detect this model of operating mode correction by real-time, the control of reactive power compensating algorithm is followed the tracks of the change of this model and is adopted predictive control algorithm to export reactive power compensation amount in real time simultaneously.
Shown in Fig. 3, magnet controlled reactor (MCR) directly connects the high pressure of 10KV.Adopt the designing technique of magnetic path parallel connection leakage self-shielding magnetic circuit and auto-coupling direct current magnetism-assisting circuit, iron core adopts the close undersaturated symmetrical fissions structure of magnetic, and winding adopts connect in parallel with upside and downside bilateral symmetry.Adopt the low-voltage thyristor of high reliability, only bear 1% ~ 2% of system voltage, thyristor adopts the nature type of cooling.Thyristor action, the harmonic wave that rectify control produces does not flow into outer AC system, even if thyristor or diode damage, magnet controlled reactor is also only equivalent to a no-load transformer, not the operation of influential system.
More than illustrate and be only Application Example of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalence change that the present patent application the scope of the claims is done, still belong to protection scope of the present invention.
Claims (6)
1. an Intelligent resonance suppression wave height power factor high voltage stator pressure-speed regulating device, include high-tension switch cabinet, transformer, digital high-voltage stator variable voltage speed control system (1), harmonic detecting unit (2), high-order harmonic filtering device, idle compensating control (3) and control and protection unit (4), it is characterized in that, described variable voltage control (1) system takes the scheme that the Phase angle control of the silicon controlled component of stator and motor Switch Rotor resistance control to combine, in-60% ~+60% scope of setting speed, the continuous velocity had nothing to do by closed-loop control realization and load is regulated, accelerated by opened loop control Switch Rotor resistance beyond this scope, described closed-loop control includes current detecting unit, speed preset unit, ramp function generator, speed control, current follower, current controller, door control unit, Application of Motor Speed Detecting unit, described pressure and speed regulating system is also connected to harmonic detecting unit (2) and magnet controlled reactor two branch roads, harmonic detecting unit (2) and magnet controlled reactor are connected to high-order harmonic filtering device and idle compensating control (3), and in two branch roads, be provided with control and protection unit (4).
2. utilize pressure-speed regulating device as claimed in claim 1 to carry out the method for variable voltage control, it is characterized in that, when speed regulating device output current, according to the Mathematical Modeling set up in advance and operating mode, synchronously dropped into the harmonic wave eliminating amount and reactive power compensation amount that pre-determine and need to drop into by control and protection unit (4) and idle compensating control (3); The harmonic wave simultaneously produced whole speed regulating device under motor real-time working condition and actual power factor are measured, and carry out dynamic flexible regulate compensation rate by controlling idle compensating control (3); When the unusual conditions such as harmonic current abnormal increase, voltage, current anomaly being detected, by the vacuum circuit-breaker of control and protection unit (4) excision high-tension switch cabinet, excision magnet controlled reactor and fixing filter branch respectively compensate branch road.
3. Intelligent resonance suppression wave height power factor high voltage stator pressure-speed regulating device as claimed in claim 1, it is characterized in that, described harmonic detecting unit (2) is made up of analog-to-digital conversion module and dsp chip, load current is measured by current transformer, digital signal is transformed into through analog-to-digital conversion module, then send the fast fourier transformation algorithm process of dsp chip, obtain the size of first-harmonic and other harmonic components; Harmonic filter is made up of 2 group of 5 subharmonic filter branch L5, C5 and 5,5 and 1 group of 7 subharmonic filter branch L7, C7, and each harmonic props up route reactor and capacitor C in series composition.
4. the method for variable voltage control as claimed in claim 2, it is characterized in that, the method of described variable voltage control also includes the connection of transformer, the connection adopted adopts delta connection for having side winding at least, the transformer of this connection itself can eliminate 3 subharmonic, so do not consider 3 subharmonic filtering problems, by measuring, what its harmonic components was higher is 5 subharmonic, and 7 subharmonic secondly, high-order harmonic filtering device only needs to compensate 5 times and 7 subharmonic just can realize harmonic carcellation, harmonic detecting unit (2) is by Real-Time Monitoring harmonic wave, its abnormal to increase time provide alarm signal by control and protection unit and high-tension switch cabinet surgical filtering branch road.
5. the method for variable voltage control as claimed in claim 4, is characterized in that, described high-order harmonic filtering device to 5 times, 7 subharmonic compensate, the harmonic current of filtering appts, unnecessary capacity provides capacitive reactive power for system, magnet controlled reactor provides continuously dynamically adjustable perception idle for system, idle compensating control (3) adopts the full-digital intelligent based on DSP to control, and comprises data acquisition unit and the control of reactive power compensating unit, idle compensating control (3) follows the tracks of load variations by data acquisition unit, the current controller detecting pressure and speed regulating system exports iCZ, the idle Q of measuring system, detect phase voltage u, phase current i, and input to Mathematical Modeling that DSP sets up in advance and the control of reactive power compensating algorithm and carry out process and obtain reactive power compensation amount, then by the control of reactive power compensating unit, regulate the angle of flow of magnet controlled reactor energized circuit thyristor, the degree of saturation of real-time adjustment magnet controlled reactor, thus regulate its perceptual output capacity, reactive capability Q dynamic equilibrium needed for guarantee system, realize the flexible compensation of dynamic reactive.
6. Intelligent resonance suppression wave height power factor high voltage stator pressure-speed regulating device as claimed in claim 1, it is characterized in that, described magnet controlled reactor adopts the designing technique of magnetic path parallel connection leakage self-shielding magnetic circuit and auto-coupling direct current magnetism-assisting circuit, iron core adopts the close undersaturated symmetrical fissions structure of magnetic, and winding adopts connect in parallel with upside and downside bilateral symmetry; Adopt low-voltage thyristor, only bear 1% ~ 2% of system voltage, thyristor adopts the nature type of cooling.
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| CN201510022281.5A CN105450134B (en) | 2015-01-16 | 2015-01-16 | A kind of Intelligent resonance suppression wave height power factor high voltage stator pressure-speed regulating device and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107294330A (en) * | 2017-08-09 | 2017-10-24 | 江苏环球特种电机有限公司 | A kind of intelligent three-phase asynchronous motor based on economize on electricity control |
| CN109449953A (en) * | 2018-12-22 | 2019-03-08 | 陈君诚 | Magnetic control voltage-type reactive power dynamic compensation device |
| CN109643894A (en) * | 2017-02-23 | 2019-04-16 | 株式会社志贺机能水研究所 | Higher hamonic wave generation device |
| CN110518589A (en) * | 2019-09-17 | 2019-11-29 | 南京南瑞继保电气有限公司 | Magnetic control high-voltage shunt reactor Harmonic Control Method and device |
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| CN105450134B (en) | 2018-07-27 |
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