CN105356814B - A kind of high voltage converter rotating-speed tracking Restart Method - Google Patents
A kind of high voltage converter rotating-speed tracking Restart Method Download PDFInfo
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Abstract
The invention discloses a kind of high voltage converter rotating-speed tracking Restart Methods, it is proposed that and it is a kind of to detect remanent magnetism voltage and measure the rotating-speed tracking Restart Method that torque current is combined, using dead electricity time length as the criterion for detecting different electrical quantity.When the dead electricity time is shorter, using the tracking of detection stator remanent magnetism voltage.Using the tracking based on torque current when the dead electricity time is longer.Apply test voltage in stator side, oriented with stator voltage vector, measure the torque component of stator current, until torque component is close to zero, at this point, the corresponding synchronous rotational speed of test voltage frequency is rotor speed.Finally to restart the stage, voltage-frequency ratio is made to recover normal voltage-frequency ratio after stepping up, and boosts to desired value.This method need not increase additional hardware unit, can trace into the arbitrary rotating speed of subsidiary engine, and reliability is high, and set simple.
Description
Technical field
The present invention relates to a kind of high voltage converter rotating-speed tracking Restart Methods, belong to high voltage converter control technology neck
Domain.
Background technology
In recent years, in order to realize energy-saving and emission-reduction, fossil power plant auxiliary engine has carried out substantial amounts of Frequency Conversion Modification.It is but big at present
The subsidiary engine high voltage converter of most fired power generating units does not possess low voltage ride-through capability, when input voltage be down to the 65% of rated value with
When lower, output will be automatically stopped, it is out of service, when voltage recover to it is normal after, can not restart automatically, can only be by running people
Member manually boots.It is lost to reduce, when transitory voltage landing occurs, to improve the low electricity of high voltage converter-auxiliary system
Ride-through capability is pressed, keep subsidiary engine rotating speed steady as far as possible or subsidiary engine rotating speed is made to be restored to normal operating level as quickly as possible, is protected
Hinder fired power generating unit and subsidiary engine continuous and steady operation.Therefore, it is extremely urgent to solve power station auxiliary system low-voltage crossing problem.
To fundamentally solve the problems, such as high voltage converter low voltage crossing, it is necessary to during dead electricity source be frequency converter
Energy support is provided.Such as the HVSP systems of certain company research and development, the voltage that the program is applied to high-voltage load (6kV/10kV) are temporary
Drop protection, basic principle is to increase energy storage on height high type high voltage converter dc bus, so as to maintain DC bus-bar voltage
Stablize, it is ensured that high voltage converter loads normal operation when voltage dip or short interruptions occur.But current most of high voltage variables
Frequency device all using cascade structure, has no unified dc bus, meanwhile, the power of high voltage converter is mostly MW class, required
The accumulator capacity wanted is very big, and cost is very high.
High voltage converter the rotary inertia with subsidiary engine it is very big, the free parking time from rotation status to stationary state can
Up to dozens of minutes even a few houres.And voltage transient fault time only lasts for several seconds time, just can recover normal voltage afterwards.
If when voltage recovers, the subsidiary engine of rotation status can be restarted, the operating status of subsidiary engine is made to recover normal, Jin Erneng rapidly
The output of fired power generating unit is enough made to quickly recover to normal value, avoids shutting down on a large scale, realizes low voltage crossing.Therefore, rotating speed with
Track is restarted, i.e., Fly a car start comes into being.
The content of the invention
Purpose：It is proposed that a kind of rotating-speed tracking restarts scheme, in the case of being rotated freely when asynchronous machine is because dead electricity source,
It identifies motor speed, and using the rotating speed as starting point, restarts motor, rotating speed is made to be promptly restored to desired value.
Technical solution：In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of high voltage converter rotating-speed tracking Restart Method, it is as follows including step：
Step 1：Monitor high-voltage frequency converter low voltage protection signal in real time, after frequency converter dead electricity is shut down, timer starts to calculate
Dead electricity time t, and degaussing time t is calculated according to power of motor and motor speed during dead electricityqc；
Step 2：With dead electricity the time is allowed to compare dead electricity time t, if the dead electricity time is less than dead electricity and allows the time,
Carry out step 3；If dead electricity time t, which is more than dead electricity, allows the time, frequency converter is shut down, and subsidiary engine rotating speed is waited to be down to zero, finds out thing
Therefore frequency converter and subsidiary engine are manually restarted after reason；
Step 3：T is less than t between upon loss of powerqcWhen, sine wave is converted into square wave, is counted by stator voltage by Zero-cross comparator
The time difference Δ t between the rising edge and trailing edge of square wave is calculated, draws the frequency of square waveRotor speedN in formulaoFor the rotor speed measured, p1For motor number of pole-pairs；
Step 4：T is more than t between upon loss of powerqc, when allowing the time less than dead electricity, apply test voltage in stator side, with fixed
Sub- voltage vector orientation measures the torque component of stator current, until torque current component is close to zero, at this point, test voltage
The corresponding synchronous rotational speed of frequency is rotor speed；
Step 5：Restart the stage, when torque current reaches threshold value, the threshold value is arranged to the 10% of no-load current,
Motor voltage-frequency ratio is improved step by step, until specified voltage-frequency ratio, finally keeps specified voltage-frequency ratio to boost to rated voltage.
In step 1, degaussing time tqcIt is arranged to from dead electricity to remanent magnetism voltage attenuation to 1%UNTime, UNFor motor
Rated voltage；Use formulaBe calculated, in formula k be coefficient, PNFor motor rated power, f1For frequency converter dead electricity wink
Between output voltage frequency.
Step 4 measurement rotor speed method is as follows：
4a. applies frequency from 50Hz to the test voltage of 0Hz even variations in stator side, and frequency transformation period is arranged to 1-
3 seconds, the amplitude U ≈ 10%U of test voltageN, UNFor motor rated voltage；
It during 4b. calculating torque electric currents, is oriented with stator voltage vector, t axis is made to be overlapped with stator voltage vector；Ignore stator
Impedance and the effect of stator leakage reactance, orderThen it=iαcosθ+iβSin θ, θ is voltage vector in formulaOrientation angle,
4c. compares torque current with torque current threshold value, it is believed that searching rotor speed during less than threshold value, this
When test voltage frequency corresponding to no-load speed be rotor speed.
It is more specific as follows than boosting method using progressive voltage-frequency in step 5：After rotor speed is searched, voltage-frequency ratio is by searching for
When 10%, gradually risen in boost process to 50%, 80%, 90% and magnetized, eventually arrive at specified voltage-frequency ratio.
Advantageous effect：A kind of high voltage converter rotating-speed tracking Restart Method provided by the invention, elaborates online recognition
Motor speed starts the method for the subsidiary engine in rotation.When Service Power in Thermal Power Plant voltage temporarily drop occurs or has a power failure in short-term, subsidiary engine is high
Voltage frequency changer can trigger under-voltage protection due to input voltage is too low, locking output, and subsidiary engine is caused to run out of steam power supply, rotating speed from
By declining, if subsidiary engine rotating speed is waited to drop to zero, restart subsidiary engine manually again after reconnoitring cause of accident, then can trigger system RB, cause
Fired power generating unit output fluctuation is even shut down, and loss is huge.The present invention can make subsidiary engine that can be opened again in power up
It is dynamic, ensure that stator current is steady and not overcurrent, so that subsidiary engine rotating speed is held essentially constant, subsidiary engine output is stablized, and maintains thermoelectricity
Unit output is smooth, reduces the number of stoppages that fired power generating unit is caused to be shut down due to voltage dip or short supply interruption.
Description of the drawings
Fig. 1 is rotating-speed tracking Restart Method flow chart；
The exemplary waveform diagram of rotor speed and stator voltage electric current during Fig. 2 restarts for rotating-speed tracking；
Fig. 3 is with the stator current vector decomposition diagram of stator voltage vector oriented.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of high voltage converter rotating-speed tracking Restart Method provided by the invention, rotor turns in overall process
The typical waveform of speed and stator voltage electric current is as shown in Figure 2.Include the following steps：
Step 1：Monitoring high-voltage frequency converter low voltage protection signal in real time, timer starts timing after frequency converter locking output,
And according to motor speed when having a power failure and motor power calculation degaussing time tqc。tqcFor from down to remanent magnetism voltage attenuation to close
(according to the precision of measuring apparatus, 1%U is may be configured as in zeroN, UNFor motor rated voltage) this period.Degaussing time master
Related with running frequency and power of motor, running frequency is higher, and the degaussing time is shorter, and power of motor is bigger, and the degaussing time is longer,
Use formulaIt is calculated, coefficient k will be fitted by measured data of experiment and be drawn in formula.
Step 2：With dead electricity the time is allowed to compare dead electricity time t, if the dead electricity time is less than dead electricity and allows the time,
Step 3 is carried out, allows the time if more than dead electricity, then frequency converter is shut down, and subsidiary engine rotating speed is waited to be down to zero, after finding out cause of accident
Manually restart frequency converter and subsidiary engine.Dead electricity allows the time to be determined by acceptable subsidiary engine exporting change maximum and subsidiary engine rotary inertia
Determine, it is necessary to carry out experiment measurement, and be engaged with fired power generating unit RB strategies.
Step 3：T is less than t between upon loss of powerqcWhen, sine wave is converted into square wave, is counted by stator voltage by Zero-cross comparator
The time difference Δ t between the rising edge and trailing edge of square wave is calculated, then the frequency of square waveRotor speed
N in formulaoFor the rotor speed measured, p1For motor number of pole-pairs.
Step 4：Dead electricity time t is more than tqcWhen, apply test electricity of the frequency from 50Hz to 0Hz even variations in stator side
Pressure.Transformation period can take 1-3 seconds according to actual needs, and transformation period selection principle is in the case where meeting speed tracing precision
The short time is chosen as far as possible.The amplitude U ≈ 10%U of test voltageN, amplitude selection principle is the movement shape that cannot influence motor
State.In the case where test voltage f and U are determined, the modulation wave signal of instantaneous three-phase voltage is drawn by formula (1)-(3)：
In formula
Wherein UmFor excitation voltage perunit value, UtFor torque voltage perunit value, uαAnd uβTwo-phase respectively under α β coordinate systems
Voltage value.
Meanwhile stator three-phase current instantaneous value is detected, i is obtained by formula (4)αAnd iβ
iαAnd iβBiphase current value respectively under α β coordinate systems.
Ignore stator impedance and stator leakage reactance, i.e., For motor stator side voltage,For stator-induced electromagnetic
Kinetic potential.Stator voltage and stator current are put into α β and mt coordinate systems, as shown in figure 3, whereinIt is sweared with stator voltage
AmountIn the same direction, active power will be generated, can be approximately considered be stator current torque component.Torque can be calculated by formula (5)
Electric current：
When torque current threshold value is arranged on the 10% of about no-load current, error is subjected to.It, can be according to scene during actual motion
It tests to set suitable torque current threshold value.When torque current reaches threshold value, you can think to search rotor speed.
Step 5：Restart the stage, if when torque current reaches threshold value, the frequency of test voltage is fc, amplitude is
10%UN.Voltage-frequency ratio is made to step up, voltage magnitude U constant speed rises, and voltage rises when the rate of climb can normally start with motor
Speed is identical.If Δ f is target frequency fNWith restarting original frequency fcDifference, then frequency increase by 0~10% Δ f during, voltage-frequency
Than 50% for normal value；During frequency increases by 10%~20% Δ f, voltage-frequency is than 80% for normal value；Frequency increases by 20%
During~30% Δ f, voltage-frequency is than 90% for normal value；Recover normal voltage-frequency ratio afterwards, and boost to desired value.
Step 6：Terminate.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (3)
1. a kind of high voltage converter rotating-speed tracking Restart Method, it is characterised in that：It is as follows including step：
Step 1：Monitor high-voltage frequency converter low voltage protection signal in real time, after frequency converter dead electricity is shut down, timer starts to calculate dead electricity
Time t, and degaussing time t is calculated according to power of motor and motor speed during dead electricityqc；
Step 2：With dead electricity the time is allowed to compare dead electricity time t, if the dead electricity time is less than dead electricity and allows the time, carried out
Step 3；If dead electricity time t, which is more than dead electricity, allows the time, frequency converter is shut down, and subsidiary engine rotating speed is waited to be down to zero, finds out accident original
Frequency converter and subsidiary engine are manually restarted because after；
Step 3：T is less than t between upon loss of powerqcWhen, sine wave is converted into square wave, calculating side by stator voltage by Zero-cross comparator
Time difference Δ t between the rising edge and trailing edge of ripple draws the frequency of square waveRotor speedFormula
Middle noFor the rotor speed measured, p1For motor number of pole-pairs；
Step 4：T is more than t between upon loss of powerqc, when allowing the time less than dead electricity, apply test voltage in stator side, with stator electricity
Vector oriented is pressed, measures the torque component of stator current, until torque current component is close to zero, at this point, test voltage frequency
Corresponding synchronous rotational speed is rotor speed；
Step 5：Restart the stage, when torque current reaches threshold value, the threshold value is arranged to the 10% of no-load current, step by step
Motor voltage-frequency ratio is improved, until specified voltage-frequency ratio, finally keeps specified voltage-frequency ratio to boost to rated voltage；
In step 1, degaussing time tqcIt is arranged to from dead electricity to remanent magnetism voltage attenuation to 1%UNTime, UNIt is specified for motor
Voltage；Use formulaBe calculated, in formula k be coefficient, PNFor motor rated power, f1For frequency converter dead electricity moment
Output voltage frequency.
2. a kind of high voltage converter rotating-speed tracking Restart Method according to claim 1, which is characterized in that step 4 measures
Rotor speed method is as follows：
4a. applies frequency from 50Hz to the test voltage of 0Hz even variations in stator side, and frequency transformation period is arranged to 1-3 seconds,
The amplitude U ≈ 10%U of test voltageN, UNFor motor rated voltage；
It during 4b. calculating torque electric currents, is oriented with stator voltage vector, t axis is made to be overlapped with stator voltage vector；Ignore stator impedance
With the effect of stator leakage reactance, orderThen it=iαcosθ+iβSin θ, θ is motor stator side voltage in formulaPositioning
Angle, For motor stator side voltage,For stator-induced electromagnetic kinetic potential；itFor torque current；iαAnd iβPoint
Biphase current value that Wei be under α β coordinate systems；
4c. compares torque current with torque current threshold value, it is believed that searching rotor speed during less than threshold value, surveys at this time
The no-load speed tried corresponding to electric voltage frequency is rotor speed.
A kind of 3. high voltage converter rotating-speed tracking Restart Method according to claim 1, which is characterized in that the step 5
It is middle more specific as follows than boosting method using progressive voltage-frequency：After rotor speed is searched, 10% when voltage-frequency is than by searching for, it is boosting
It is gradually risen in the process to 50%, 80%, 90% and is magnetized, eventually arrive at specified voltage-frequency ratio.
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| CN106533312B (en) * | 2016-11-14 | 2021-08-31 | 希望森兰科技股份有限公司 | Method for tracking and restarting asynchronous motor rotating speed |
| CN110417307A (en) * | 2019-07-03 | 2019-11-05 | 珠海格力电器股份有限公司 | Direct current brushless motor control method and device, storage medium and controller |
| CN112332719B (en) | 2019-07-30 | 2023-05-23 | 南京泉峰科技有限公司 | Control method and system of electric tool and electric tool |
| CN113507237B (en) * | 2021-07-21 | 2023-03-21 | 中冶赛迪工程技术股份有限公司 | Method for optimizing frequency converter runaway starting |
| CN114640291B (en) * | 2022-05-19 | 2022-07-29 | 希望森兰科技股份有限公司 | Method for tracking and starting rotating speed of asynchronous motor during short-time shutdown |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299679A (en) * | 2011-08-30 | 2011-12-28 | 中冶南方（武汉）自动化有限公司 | Method for determining rotating speed of restarted asynchronous motor |
| CN203166769U (en) * | 2013-01-21 | 2013-08-28 | 江苏力普电子科技有限公司 | High voltage frequency converter having rotating speed tracking and starting function |
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| JPH06233596A (en) * | 1993-01-29 | 1994-08-19 | Toshiba Corp | Controller of winding wound rotor induction motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299679A (en) * | 2011-08-30 | 2011-12-28 | 中冶南方（武汉）自动化有限公司 | Method for determining rotating speed of restarted asynchronous motor |
| CN203166769U (en) * | 2013-01-21 | 2013-08-28 | 江苏力普电子科技有限公司 | High voltage frequency converter having rotating speed tracking and starting function |
Non-Patent Citations (2)
| Title |
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| AT89C2051单片机在发电机转速监控装置中的应用;李生民等;《电气传动自动化》;20011031;第23卷(第5期);第62-64页 * |
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