CN109088474A - Prevent the quick power switching method and system of non-Switching Synchronization - Google Patents

Prevent the quick power switching method and system of non-Switching Synchronization Download PDF

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Publication number
CN109088474A
CN109088474A CN201710443341.XA CN201710443341A CN109088474A CN 109088474 A CN109088474 A CN 109088474A CN 201710443341 A CN201710443341 A CN 201710443341A CN 109088474 A CN109088474 A CN 109088474A
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difference
frequency
phase angle
moment
residual voltage
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CN109088474B (en
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沈燕华
张振华
崔敏
陈海龙
雷俊
陈旭波
刘志文
徐玉洁
吕灵芝
黄欣
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State Grid Corp of China SGCC
Xuji Group Co Ltd
State Grid Shanxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Xuji Group Co Ltd
State Grid Shanxi Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Abstract

The present invention relates to the quick power switching method and systems for preventing non-Switching Synchronization, firstly, detecting the frequency and phase angle information of the bus residual voltage of different moments, and correspond to the frequency and phase angle information of the backup power source at moment；Then, the difference on the frequency and phase angle difference of breaker closing moment bus residual voltage and backup power source are predicted；Finally, if the difference on the frequency at the breaker closing moment of prediction is less than setpoint frequency difference threshold value, and the phase angle difference at breaker closing moment is less than setting phase angle difference threshold value, then, breaker closing is controlled, quick power switching is carried out.This method, which can be avoided, to be appeared in auxiliaries-supply circuit-breaker and closes a floodgate the case where causing non-Switching Synchronization moment, prevent the non-Switching Synchronization of the asynchronous motor and backup power source on station service bus, also greater impact electric current and electromagnetic torque caused by would not generating because of non-Switching Synchronization, the fatigue loss that powerful stress and formation will not be generated to motor, extends Acceptable life.

Description

Prevent the quick power switching method and system of non-Switching Synchronization
Technical field
The present invention relates to the quick power switching method and systems for preventing non-Switching Synchronization.
Background technique
It is the essential method of reliable power supply that quick power switching, which is in existing electric system, but quick in power supply In handoff procedure, after asynchronous motor power loss, asynchronous motor becomes generating state from motoring condition, and busbar voltage is due to asynchronous The presence for the potential for feedback that motor generates, frequency are asynchronous speed frequency, subsequent busbar voltage by synchronous rotational speed frequency transient Frequency and amplitude will gradually decay according to asynchronous motor inherent damping, and the phase angle difference of bus residual voltage and backup power source gradually increases Greatly.Difference on the frequency, phase angle difference and the voltage difference that must be taken into consideration between the bus residual voltage of feedback and backup power source voltage when therefore switching are drawn The Current Voltage shock problem risen, avoids power supply non-Switching Synchronization and causes the serious consequences such as equipment damage or the lost of life.
Traditional quick power switching method of discrimination is according to the bus residual voltage and standby electricity of apparatus for fast switching real-time measurement Difference on the frequency and phase angle difference between the voltage of source carry out differentiation switching, when difference on the frequency is less than definite value, and phase angle difference is less than definite value, immediately Hair closes auxiliaries-supply circuit-breaker order, executes quick power switching, as shown in Figure 1, phase angle difference is 31.405 °.So traditional Cutting criterion fastly can only make comparisons with the frequency of phase angle and backup power source with phase angle according to the frequency that Startup time measures, on startup It carves in certain time, for example hair closes auxiliaries-supply circuit-breaker order in 15 milliseconds, since breaker closing process needs to consume one Fixed time, traditional switching method do not account for breaker closing process (longest can reach milliseconds up to a hundred) and in the time, that is, close The variation of the difference on the frequency, phase angle difference of residual voltage in lock duration, it is most likely that close a floodgate moment in auxiliaries-supply circuit-breaker Cause non-Switching Synchronization, as shown in Fig. 2, closing moment phase angle difference be much larger than phase angle difference definite value (it is general maximum no more than 60 °, But the phase angle difference in Fig. 2 is 88.598 °).Non-Switching Synchronization will generate biggish dash current and electromagnetic torque, will be to electricity Motivation generates powerful stress, forms fatigue loss, shortens Acceptable life；Non-Switching Synchronization will also impact backup power source system System, influences the stabilization of backup power source.
Summary of the invention
It is traditional to solve the object of the present invention is to provide a kind of quick power switching method for preventing non-Switching Synchronization Switching method is possible to the problem of auxiliaries-supply circuit-breaker combined floodgate moment causing non-Switching Synchronization.Present invention simultaneously provides one kind Prevent the quick power switching system of non-Switching Synchronization.
To achieve the above object, the solution of the present invention includes a kind of quick power switching method for preventing non-Switching Synchronization, The following steps are included:
(1) frequency and phase angle information of the bus residual voltage of different sampling instants are detected, and corresponds to the spare of sampling instant The frequency and phase angle information of power supply；
(2) according to said frequencies and phase angle information, the duration and different moments bus residual voltage of breaker with The difference on the frequency and phase angle difference changing rule of backup power source predict the difference on the frequency of breaker closing moment bus residual voltage and backup power source And phase angle difference, correspondence obtain difference on the frequency predicted value and phase angle difference predicted value；
(3) if the difference on the frequency predicted value is less than combined floodgate difference on the frequency threshold value, and the phase angle difference predicted value is less than combined floodgate Phase angle difference threshold value then controls the breaker closing, carries out quick power switching.
The prediction breaker closing moment bus residual voltage and the difference on the frequency and phase angle difference of backup power source include:
1) according to the frequency and phase angle information of the bus residual voltage of at least three sampling instants detected, and corresponding sampling The frequency and phase angle information of the backup power source at moment obtain the difference on the frequency and phase angle of each sampling instant bus residual voltage and backup power source Difference；
2) according to the difference on the frequency and phase angle difference of each sampling instant bus residual voltage and backup power source, difference on the frequency and phase are obtained The pace of change of angular difference；
3) according to the pace of change of the difference on the frequency and phase angle difference, the variation acceleration of difference on the frequency and phase angle difference is obtained；
4) according to the pace of change of the difference on the frequency and phase angle difference, the variation acceleration and open circuit of difference on the frequency and phase angle difference The duration of device predicts the difference on the frequency predicted value, according to phase according to difference on the frequency and the conic section of time rule Angular difference and the conic section of time rule, predict the phase angle difference predicted value.
In the step 1), the frequency and phase angle information of the bus residual voltage of three sampling instants are continuously detected, and corresponding The frequency and phase angle information of the backup power source of sampling instant.
Three sampling instants are followed successively by the first sampling instant, the second sampling instant and third sampling instant, difference on the frequency With the calculation formula of the pace of change of phase angle difference are as follows:
Wherein, the t0 moment is first sampling instant, and the t1 moment is second sampling instant, and the t2 moment is described the Three sampling instants, Vf1The pace of change of difference on the frequency, V in time between t0 moment and t1 momentf2For t1 moment and t2 moment Between time in difference on the frequency pace of change, VФ1The pace of change of time internal phase angle difference between t0 moment and t1 moment, VФ2The pace of change of time internal phase angle difference between t1 moment and t2 moment, Δ f0=fm0-fb0, Δ f1=fm1-fb1, Δ f2 =fm2-fb2, ΔΦ0=Φm0-Φb0, ΔΦ1=Φm1-Φb1, ΔΦ2=Φm2-Φb2, fm0For the frequency of t0 moment bus residual voltage Rate, Фm0For the phase angle of t0 moment bus residual voltage, fb0For the frequency of t0 moment backup power source, Фb0For t0 moment backup power source Phase angle, fm1For the frequency of t1 moment bus residual voltage, Фm1For the phase angle of t1 moment bus residual voltage, fb1For t1 moment backup power source Frequency, Фb1For the phase angle of t1 moment backup power source, fm2For the frequency of t2 moment bus residual voltage, Фm2For t2 moment bus residual voltage Phase angle, fb2For the frequency of t2 moment backup power source, Фb2For the phase angle of t2 moment backup power source；
The calculation formula of the difference on the frequency and the variation acceleration of phase angle difference are as follows:
Wherein, af2For the variation acceleration of difference on the frequency, aФ2For the variation acceleration of phase angle difference；
The calculation formula of the difference on the frequency and phase angle difference that change in the breaker actuation duration are as follows:
The difference on the frequency at breaker closing moment and the calculation formula of phase angle difference are as follows:
Δ f=Δ f2+Δft
ΔΦ=ΔΦ2+ΔΦt。
The present invention also provides a kind of quick power switching systems for preventing non-Switching Synchronization, comprise the following modules:
Data acquisition module, the frequency and phase angle information of the bus residual voltage for detecting different sampling instants, and it is corresponding The frequency and phase angle information of the backup power source of sampling instant；
Prediction module is used for according to said frequencies and phase angle information, the duration of breaker and different moments The difference on the frequency and phase angle difference changing rule of bus residual voltage and backup power source predict breaker closing moment bus residual voltage and standby electricity The difference on the frequency and phase angle difference in source, correspondence obtain difference on the frequency predicted value and phase angle difference predicted value；
Switching control module, if being less than combined floodgate difference on the frequency threshold value, and the phase angle difference for the difference on the frequency predicted value Predicted value is less than closing phase angle difference threshold value, then controls the breaker closing, carries out quick power switching.
The prediction module includes:
It is adopted for the frequency and phase angle information according to the bus residual voltage of at least three sampling instants detected, and correspondence The frequency and phase angle information of the backup power source at sample moment obtain the difference on the frequency and phase of each sampling instant bus residual voltage and backup power source Angular difference；
For the difference on the frequency and phase angle difference according to each sampling instant bus residual voltage and backup power source, obtain difference on the frequency and The pace of change of phase angle difference；
For the pace of change according to the difference on the frequency and phase angle difference, the variation acceleration of difference on the frequency and phase angle difference is obtained；
For the pace of change according to the difference on the frequency and phase angle difference, the variation acceleration of difference on the frequency and phase angle difference and disconnected The duration of road device predicts the difference on the frequency predicted value according to difference on the frequency and the conic section of time rule, according to The conic section of phase angle difference and time rule, predict the phase angle difference predicted value.
The continuously frequency and phase angle information of the bus residual voltage of three sampling instants of detection, and corresponding sampling instant are spare The frequency and phase angle information of power supply.
Three sampling instants are followed successively by the first sampling instant, the second sampling instant and third sampling instant, difference on the frequency With the calculation formula of the pace of change of phase angle difference are as follows:
Wherein, the t0 moment is first sampling instant, and the t1 moment is second sampling instant, and the t2 moment is described the Three sampling instants, Vf1The pace of change of difference on the frequency, V in time between t0 moment and t1 momentf2For t1 moment and t2 moment Between time in difference on the frequency pace of change, VФ1The pace of change of time internal phase angle difference between t0 moment and t1 moment, VФ2The pace of change of time internal phase angle difference between t1 moment and t2 moment, Δ f0=fm0-fb0, Δ f1=fm1-fb1, Δ f2 =fm2-fb2, ΔΦ0=Φm0-Φb0, ΔΦ1=Φm1-Φb1, ΔΦ2=Φm2-Φb2, fm0For the frequency of t0 moment bus residual voltage Rate, Фm0For the phase angle of t0 moment bus residual voltage, fb0For the frequency of t0 moment backup power source, Фb0For t0 moment backup power source Phase angle, fm1For the frequency of t1 moment bus residual voltage, Фm1For the phase angle of t1 moment bus residual voltage, fb1For t1 moment backup power source Frequency, Фb1For the phase angle of t1 moment backup power source, fm2For the frequency of t2 moment bus residual voltage, Фm2For t2 moment bus residual voltage Phase angle, fb2For the frequency of t2 moment backup power source, Фb2For the phase angle of t2 moment backup power source；
The calculation formula of the difference on the frequency and the variation acceleration of phase angle difference are as follows:
Wherein, af2For the variation acceleration of difference on the frequency, aФ2For the variation acceleration of phase angle difference；
The calculation formula of the difference on the frequency and phase angle difference that change in the breaker actuation duration are as follows:
The difference on the frequency at breaker closing moment and the calculation formula of phase angle difference are as follows:
Δ f=Δ f2+Δft
ΔΦ=ΔΦ2+ΔΦt。
In the quick power switching method provided by the invention for preventing non-Switching Synchronization, firstly, when detecting several differences The frequency and phase angle information of the bus residual voltage at quarter, and correspond to the frequency and phase angle information of the backup power source of sampling instant；Then, According to obtained frequency and phase angle information, the duration and different moments bus residual voltage and backup power source of breaker Difference on the frequency and phase angle difference changing rule, predict the breaker closing moment, i.e. breaker closing moment, bus residual voltage and standby electricity The difference on the frequency and phase angle difference in source, if the frequency between breaker closing moment, bus residual voltage and backup power source that prediction obtains Rate difference is less than the combined floodgate difference on the frequency threshold value of setting, and the phase angle difference between bus residual voltage and backup power source is less than the combined floodgate phase of setting Angular difference threshold value controls breaker closing, carries out the switching of power supply.So can be predicted by this method in breaker closing Difference on the frequency and phase angle difference between moment bus residual voltage and backup power source, and directly utilize breaker closing moment bus residual voltage Difference on the frequency and phase angle difference between backup power source carry out combined floodgate judgement, if the difference on the frequency at this moment is less than setpoint frequency Poor threshold value, and phase angle difference is less than setting phase angle difference threshold value, then, it indicates to carry out quick power switching in breaker closing moment Words, the case where being not in non-Switching Synchronization, therefore, this method, which can be avoided, to be appeared in auxiliaries-supply circuit-breaker moment of closing a floodgate and makes The case where at non-Switching Synchronization, prevents the non-synchronous conjunction of the asynchronous motor (generating state) and backup power source on station service bus Lock, greater impact electric current and electromagnetic torque caused by would not also generating because of non-Switching Synchronization will not generate motor powerful Stress and formation fatigue loss, extend Acceptable life.Meanwhile it avoiding due to non-Switching Synchronization to backup power source It is impacted caused by system, ensure that the stabilization of backup power source, avoid damaging equipment.Therefore, with the fast of forecast function Fast switching method becomes an important link safe and reliable in fast incision technology, ensure that the stabilization and power equipment of electric system Safety.In addition, the realization of this method is not required to increase additional hardware device, higher want will not be proposed to original platform It asks, can be realized on original equipment platform, realize that threshold is lower, convenient for promoting the use of.
Detailed description of the invention
Fig. 1 is that traditional fast switching device hair closes back-up breaker order moment phase angle difference analogous diagram；
Fig. 2 is the phase angle difference analogous diagram that traditional fast switching device back-up breaker closes the moment；
Fig. 3 is the comparison chart of quick power switching method and existing method provided by the invention.
Specific embodiment
Prevent the quick power switching embodiment of the method for non-Switching Synchronization
A kind of quick power switching method preventing non-Switching Synchronization provided by the invention, generally comprises following steps:
(1) frequency and phase angle information of the bus residual voltage of different sampling instants are detected, and corresponds to the spare of sampling instant The frequency and phase angle information of power supply；
(2) according to said frequencies and phase angle information, the duration and different moments bus residual voltage of breaker with The difference on the frequency and phase angle difference changing rule of backup power source predict the difference on the frequency of breaker closing moment bus residual voltage and backup power source And phase angle difference, correspondence obtain difference on the frequency predicted value and phase angle difference predicted value；
(3) if difference on the frequency predicted value is less than combined floodgate difference on the frequency threshold value, and phase angle difference predicted value is less than closing phase angle difference threshold Value then controls breaker closing, carries out quick power switching.
Above steps is described in detail below in conjunction with particular technique means.
Step 1:
Detect the frequency and phase angle information of the bus residual voltage of different sampling instants, and the backup power source of corresponding sampling instant Frequency and phase angle information.Due under normal conditions, in data acquisition, being acquired according to the sampling period, adjacent twice numbers It is separated by a sampling period according to sampling instant.So, in the frequency and phase angle information and backup power source for acquiring bus residual voltage When frequency and phase angle information, a sampling period is separated by between any two sampling instants, and the length in sampling period is according to reality It is set.Also, the number of sampling instant, i.e. acquisition how many times data, are set according to actual requirement, with It can be realized subject to the difference on the frequency and phase angle difference that predict breaker closing moment bus residual voltage and backup power source (due to hereinafter Need to calculate acceleration, therefore, the number of sampling instant it is minimum be 3), such as: if the number of sampling instant is 4, i.e., Detect the frequency and phase angle information and the backup power source of 4 corresponding sampling instants of the bus residual voltage of 4 different sampling instants Frequency and phase angle information can be realized the difference on the frequency and phase angle for predicting breaker closing moment bus residual voltage and backup power source Difference, then, the number of sampling instant can be for 4.In the present embodiment, the number of sampling instant is 3, i.e., continuous detection three The corresponding frequencies and phase angle information of sampling instant.
These three sampling instants are followed successively by the first sampling instant, the second sampling instant and third sampling instant, setting: when t0 Carving is the first sampling instant, and the t1 moment is the second sampling instant, and the t2 moment is third sampling instant.The t0 moment is earlier than the t1 moment one A sampling period, the t1 moment earlier than one sampling period of t2 moment, if setting t2 moment (i.e. breaker if current time At the time of starting movement), then, at the time of the t1 moment is exactly current time previous cycle, the t0 moment is exactly two before current time At the time of period.
So, the frequency of detection and phase angle information just have: the frequency f of t0 moment bus residual voltagem0, t0 moment bus residual voltage Phase angle Фm0, the frequency f of t0 moment backup power sourceb0, the phase angle Ф of t0 moment backup power sourceb0.The frequency of t1 moment bus residual voltage fm1, the phase angle Ф of t1 moment bus residual voltagem1, the frequency f of t1 moment backup power sourceb1, the phase angle Ф of t1 moment backup power sourceb1。t2 The frequency f of moment bus residual voltagem2, the phase angle Ф of t2 moment bus residual voltagem2, the frequency f of t2 moment backup power sourceb2, the t2 moment is standby With the phase angle Ф of power supplyb2.Above-mentioned each data can detect that this partly belongs to routine techniques, here according to relevant device No longer illustrate.
Step 2:
According to each frequency and phase angle information, the duration of breaker and different moments bus residual voltage with it is spare (in the present embodiment, which is difference on the frequency and the conic section of time rule, phase to the difference on the frequency and phase angle difference changing rule of power supply Angular difference and the conic section of time rule), predict the difference on the frequency and phase angle of breaker closing moment bus residual voltage and backup power source Difference.That is, second step is prediction steps, according to each data of detection and the duration of auxiliaries-supply circuit-breaker T predicts the breaker closing moment, i.e. breaker closing moment, the difference on the frequency and phase angle difference of bus residual voltage and backup power source.This reality It applies example and provides a kind of following prediction process, certainly, the invention is not limited to following embodiments.
1) the bus residual voltage of each sampling instant and spare is calculated according to the above-mentioned each frequency detected and phase angle information The difference on the frequency and phase angle difference of power supply, calculation formula are as follows:
Δf0=fm0-fb0
Δf1=fm1-fb1
Δf2=fm2-fb2
ΔΦ0=Φm0-Φb0
ΔΦ1=Φm1-Φb1
ΔΦ2=Φm2-Φb2
Wherein, Δ f0For the difference on the frequency of t0 moment bus residual voltage and backup power source, Δ f1For t1 moment bus residual voltage with it is spare The difference on the frequency of power supply, Δ f2For the difference on the frequency of t2 moment bus residual voltage and backup power source, ΔΦ0For t0 moment bus residual voltage with it is standby With the phase angle difference of power supply, ΔΦ1For the phase angle difference of t1 moment bus residual voltage and backup power source, ΔΦ2For t2 moment bus residual voltage with The phase angle difference of backup power source.
2) pace of change of difference on the frequency and phase angle difference is calculated according to obtained each difference on the frequency and phase angle difference, calculation formula is such as Under:
Wherein, Vf1The pace of change of difference on the frequency, V in time between t0 moment and t1 momentf2When for t1 moment and t2 The pace of change of difference on the frequency, V in time between quarterФ1The variation speed of time internal phase angle difference between t0 moment and t1 moment Degree, VФ2The pace of change of time internal phase angle difference between t1 moment and t2 moment.
3) the variation acceleration of difference on the frequency and phase angle difference is obtained according to obtained pace of change, calculation formula is as follows:
Wherein, af2For the variation acceleration of difference on the frequency, aФ2For the variation acceleration of phase angle difference.
4) according to the duration t of pace of change, variation acceleration and auxiliaries-supply circuit-breaker according to secondary song Line gauge rule calculates the variable quantity of difference on the frequency and phase angle difference in breaker actuation duration t, and calculation formula is as follows:
The difference on the frequency and phase angle difference at breaker closing moment are calculated, calculation formula is as follows:
Δ f=Δ f2+Δft
ΔΦ=ΔΦ2+ΔΦt
Step 3:
The step is quick power switching rate-determining steps, according to the frequency at the breaker closing moment that second step is predicted Difference and phase angle difference switch over control, logic of specifically closing a floodgate are as follows: if the difference on the frequency at breaker closing moment is less than the conjunction of setting Lock difference on the frequency threshold value, and the phase angle difference at breaker closing moment is less than the closing phase angle difference threshold value of setting, then, control standby electricity Source breaker closing carries out quick power switching.
That is: Δ f < Δ fopAnd ΔΦ < ΔΦopWhen meeting simultaneously, hair closes auxiliaries-supply circuit-breaker order.Wherein, Δ fop For the combined floodgate difference on the frequency threshold value of setting, ΔΦopFor the closing phase angle difference threshold value of setting.
In conclusion by the real-time measurement of frequency, phase angle to bus residual voltage and backup power source, calculate bus residual voltage and The difference on the frequency of backup power source, the pace of change of phase angle difference and acceleration, fully consider the attenuation process of bus residual voltage, analog bus The attenuation law of residual voltage predicts difference on the frequency between auxiliaries-supply circuit-breaker closing moment, bus residual voltage and backup power source, phase Angular difference is prevented in auxiliaries-supply circuit-breaker in moment of closing a floodgate, the non-Switching Synchronization of bus residual voltage and backup power source.Fig. 3 is this hair The quick power switching method of bright offer and the comparison chart of existing method.
In above-described embodiment, difference on the frequency and phase angle difference meet conic section rule, and quadratic function, which has met, to be switched fast Required precision, so, above-described embodiment is only illustrated by taking most typical conic section as an example, certainly, the present invention not office It is limited to conic section.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention This thinking is above-mentioned quick power switching method, it is not limited to which the specific implementation means of each step in this method are not taking off The change, modification, replacement and modification carried out in the case where from the principle and spirit of the invention to embodiment still fall within the present invention Protection scope in.
Prevent the quick power switching system embodiment of non-Switching Synchronization
The present embodiment provides a kind of quick power switching systems for preventing non-Switching Synchronization, comprise the following modules:
Data acquisition module, the frequency and phase angle information of the bus residual voltage for detecting different sampling instants, and it is corresponding The frequency and phase angle information of the backup power source of sampling instant；
Prediction module is used for according to said frequencies and phase angle information, the duration of breaker and different moments The difference on the frequency and phase angle difference changing rule of bus residual voltage and backup power source predict breaker closing moment bus residual voltage and standby electricity The difference on the frequency and phase angle difference in source, correspondence obtain difference on the frequency predicted value and phase angle difference predicted value；
Switching control module, if being less than combined floodgate difference on the frequency threshold value for difference on the frequency predicted value, and phase angle difference predicted value is small In closing phase angle difference threshold value, then breaker closing is controlled, carries out quick power switching.
Wherein, the hardware configuration that data acquisition module can be understood as realizing correlation function.In addition to data acquire Except module, the other components of the system and the correlation step of quick power switching method are corresponded, these composition portions Dividing can be understood as realizing the functional module that corresponding step must be set up.So being still that power supply is quick in the system nature Switching method, protection scope are identical as the protection scope of method.Due in above method embodiment to quick power switching Method, which is made that, to be described in detail, and the present embodiment just no longer illustrates.

Claims (8)

1. a kind of quick power switching method for preventing non-Switching Synchronization, which comprises the following steps:
(1) frequency and phase angle information of the bus residual voltage of different sampling instants, and the backup power source of corresponding sampling instant are detected Frequency and phase angle information；
(2) according to said frequencies and phase angle information, the duration of breaker and different moments bus residual voltage with it is spare The difference on the frequency and phase angle difference changing rule of power supply predict the difference on the frequency and phase of breaker closing moment bus residual voltage and backup power source Angular difference, correspondence obtain difference on the frequency predicted value and phase angle difference predicted value；
(3) if the difference on the frequency predicted value is less than combined floodgate difference on the frequency threshold value, and the phase angle difference predicted value is less than closing phase angle Poor threshold value then controls the breaker closing, carries out quick power switching.
2. the quick power switching method according to claim 1 for preventing non-Switching Synchronization, which is characterized in that the prediction The difference on the frequency and phase angle difference of breaker closing moment bus residual voltage and backup power source include:
1) according to the frequency and phase angle information of the bus residual voltage of at least three sampling instants detected, and corresponding sampling instant Backup power source frequency and phase angle information, obtain the difference on the frequency and phase angle difference of each sampling instant bus residual voltage and backup power source；
2) according to the difference on the frequency and phase angle difference of each sampling instant bus residual voltage and backup power source, difference on the frequency and phase angle difference are obtained Pace of change；
3) according to the pace of change of the difference on the frequency and phase angle difference, the variation acceleration of difference on the frequency and phase angle difference is obtained；
4) according to the pace of change of the difference on the frequency and phase angle difference, the variation acceleration and breaker of difference on the frequency and phase angle difference Duration predicts the difference on the frequency predicted value, according to phase angle difference according to difference on the frequency and the conic section of time rule With the conic section rule of time, the phase angle difference predicted value is predicted.
3. the quick power switching method according to claim 2 for preventing non-Switching Synchronization, which is characterized in that the step 1) in, the frequency and phase angle information of the bus residual voltage of three sampling instants, and the standby electricity of corresponding sampling instant are continuously detected The frequency and phase angle information in source.
4. the quick power switching method according to claim 3 for preventing non-Switching Synchronization, which is characterized in that described three Sampling instant is followed successively by the first sampling instant, the second sampling instant and third sampling instant, the variation speed of difference on the frequency and phase angle difference The calculation formula of degree are as follows:
Wherein, the t0 moment is first sampling instant, and the t1 moment is second sampling instant, and the t2 moment is that the third is adopted Sample moment, Vf1The pace of change of difference on the frequency, V in time between t0 moment and t1 momentf2Between t1 moment and t2 moment Time in difference on the frequency pace of change, VФ1The pace of change of time internal phase angle difference between t0 moment and t1 moment, VФ2For The pace of change of time internal phase angle difference between t1 moment and t2 moment, Δ f0=fm0-fb0, Δ f1=fm1-fb1, Δ f2=fm2- fb2, ΔΦ0=Φm0-Φb0, ΔΦ1=Φm1-Φb1, ΔΦ2=Φm2-Φb2, fm0For the frequency of t0 moment bus residual voltage, Фm0For the phase angle of t0 moment bus residual voltage, fb0For the frequency of t0 moment backup power source, Фb0For the phase of t0 moment backup power source Angle, fm1For the frequency of t1 moment bus residual voltage, Фm1For the phase angle of t1 moment bus residual voltage, fb1For the frequency of t1 moment backup power source Rate, Фb1For the phase angle of t1 moment backup power source, fm2For the frequency of t2 moment bus residual voltage, Фm2For t2 moment bus residual voltage Phase angle, fb2For the frequency of t2 moment backup power source, Фb2For the phase angle of t2 moment backup power source；
The calculation formula of the difference on the frequency and the variation acceleration of phase angle difference are as follows:
Wherein, af2For the variation acceleration of difference on the frequency, aФ2For the variation acceleration of phase angle difference；
The calculation formula of the difference on the frequency and phase angle difference that change in the breaker actuation duration are as follows:
The difference on the frequency at breaker closing moment and the calculation formula of phase angle difference are as follows:
Δ f=Δ f2+Δft
ΔΦ=ΔΦ2+ΔΦt。
5. a kind of quick power switching system for preventing non-Switching Synchronization, which is characterized in that comprise the following modules:
Data acquisition module, the frequency and phase angle information of the bus residual voltage for detecting different sampling instants, and corresponding sampling The frequency and phase angle information of the backup power source at moment；
Prediction module, for according to said frequencies and phase angle information, the duration and different moments bus of breaker The difference on the frequency and phase angle difference changing rule of residual voltage and backup power source, prediction breaker closing moment bus residual voltage and backup power source Difference on the frequency and phase angle difference, correspondence obtain difference on the frequency predicted value and phase angle difference predicted value；
Switching control module, if being less than combined floodgate difference on the frequency threshold value for the difference on the frequency predicted value, and the phase angle difference is predicted Value is less than closing phase angle difference threshold value, then controls the breaker closing, carries out quick power switching.
6. the quick power switching system according to claim 5 for preventing non-Switching Synchronization, which is characterized in that the prediction Module includes:
For the frequency and phase angle information according to the bus residual voltage of at least three sampling instants detected, and when corresponding sampling The frequency and phase angle information of the backup power source at quarter obtain the difference on the frequency and phase angle of each sampling instant bus residual voltage and backup power source Difference；
For the difference on the frequency and phase angle difference according to each sampling instant bus residual voltage and backup power source, difference on the frequency and phase angle are obtained The pace of change of difference；
For the pace of change according to the difference on the frequency and phase angle difference, the variation acceleration of difference on the frequency and phase angle difference is obtained；
For the pace of change according to the difference on the frequency and phase angle difference, the variation acceleration and breaker of difference on the frequency and phase angle difference Duration, according to difference on the frequency and the conic section of time rule, the difference on the frequency predicted value is predicted, according to phase angle The conic section rule of difference and time, predicts the phase angle difference predicted value.
7. the quick power switching system according to claim 6 for preventing non-Switching Synchronization, which is characterized in that continuous detection The frequency and phase angle information of the bus residual voltage of three sampling instants, and correspond to the frequency and phase angle of the backup power source of sampling instant Information.
8. the quick power switching system according to claim 7 for preventing non-Switching Synchronization, which is characterized in that described three Sampling instant is followed successively by the first sampling instant, the second sampling instant and third sampling instant, the variation speed of difference on the frequency and phase angle difference The calculation formula of degree are as follows:
Wherein, the t0 moment is first sampling instant, and the t1 moment is second sampling instant, and the t2 moment is that the third is adopted Sample moment, Vf1The pace of change of difference on the frequency, V in time between t0 moment and t1 momentf2Between t1 moment and t2 moment Time in difference on the frequency pace of change, VФ1The pace of change of time internal phase angle difference between t0 moment and t1 moment, VФ2For The pace of change of time internal phase angle difference between t1 moment and t2 moment, Δ f0=fm0-fb0, Δ f1=fm1-fb1, Δ f2=fm2- fb2, ΔΦ0=Φm0-Φb0, ΔΦ1=Φm1-Φb1, ΔΦ2=Φm2-Φb2, fm0For the frequency of t0 moment bus residual voltage, Фm0For the phase angle of t0 moment bus residual voltage, fb0For the frequency of t0 moment backup power source, Фb0For the phase of t0 moment backup power source Angle, fm1For the frequency of t1 moment bus residual voltage, Фm1For the phase angle of t1 moment bus residual voltage, fb1For the frequency of t1 moment backup power source Rate, Фb1For the phase angle of t1 moment backup power source, fm2For the frequency of t2 moment bus residual voltage, Фm2For t2 moment bus residual voltage Phase angle, fb2For the frequency of t2 moment backup power source, Фb2For the phase angle of t2 moment backup power source；
The calculation formula of the difference on the frequency and the variation acceleration of phase angle difference are as follows:
Wherein, af2For the variation acceleration of difference on the frequency, aФ2For the variation acceleration of phase angle difference；
The calculation formula of the difference on the frequency and phase angle difference that change in the breaker actuation duration are as follows:
The difference on the frequency at breaker closing moment and the calculation formula of phase angle difference are as follows:
Δ f=Δ f2+Δft
ΔΦ=ΔΦ2+ΔΦt。
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