CN108037346A - The detection method of distribution transformer and its pressure regulation no-load voltage ratio, system and control method - Google Patents
The detection method of distribution transformer and its pressure regulation no-load voltage ratio, system and control method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
- H02P13/06—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changing; by rearranging interconnections of windings
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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
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- Y02E40/30—Reactive power compensation
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Abstract
The present invention relates to a kind of detection method of distribution transformer pressure regulation no-load voltage ratio, comprise the following steps：Initial distribution transformer pressure regulation no-load voltage ratio is calculated according to the primary side input voltage amplitude, secondary side current amplitude and secondary side current phase value of distribution transformer；Voltage deviation value is obtained according to the instantaneous effective values of standard voltage value and the secondary side output voltage of distribution transformer；If voltage deviation value exceeds predeterminated voltage deviation threshold, the difference of voltage deviation value and predeterminated voltage deviation threshold is obtained；Integration is carried out to difference and obtains integrated value, compensating initial distribution transformer pressure regulation no-load voltage ratio according to integrated value obtains distribution transformer pressure regulation no-load voltage ratio.The above method improves the switch speed and accuracy of distribution transformer pressure regulation no-load voltage ratio, can rapidly, accurately control electronic power switch, effectively adjusts distribution transformer output voltage, provides the foundation for the design of power electronics formula load tap changing distribution transformer.
Description
Technical field
The present invention relates to load tap changing distribution transformer technical field, more particularly to a kind of distribution transformer pressure regulation no-load voltage ratio
Detection method and system, the control method of distribution transformer and voltage regulating distribution transformer.
Background technology
Power distribution network low-voltage problem drastically influence the safety and economic operation of equipment and the high-quality reliable power supply of user, into
For one of power distribution network urgent problem to be solved.In the case of power network compensation capacity abundance, solve the problems, such as that power distribution network low-voltage needs
Solve the problems, such as voltage ＆ var control, distribution transformer on-load voltage regulation is effective voltage power-less regulation measure, therefore can be led to
Installation load tap changing distribution transformer is crossed, improves the voltage power-less regulating power of power distribution network, and then solve the low-voltage of power distribution network
Problem.
Now, power electronics formula load tap changing distribution transformer substitutes mechanical contact using electronic power switch and opens completely
Close, by controlling the break-make of electronic power switch to realize, distribution transformer on-load voltage regulation has switching without electric arc, and speed of actions is fast,
The advantages of long lifespan.The pressure regulation no-load voltage ratio of distribution transformer can be used for controlling electronic power switch to cut-off situation, but traditional
In technology, pressure regulation no-load voltage ratio switch speed in distribution transformer is slow, accuracy is low, it is difficult to meets that electronic power switch believes control
Number rapidity and accuracy requirement, hamper the development of power electronics formula load tap changing distribution transformer.
The content of the invention
Based on this, it is necessary to for the problem of pressure regulation no-load voltage ratio switching in distribution transformer is slow, accuracy is low, there is provided a kind of
Detection method and system, the control method of distribution transformer and voltage regulating distribution transformer of distribution transformer pressure regulation no-load voltage ratio.
A kind of detection method of distribution transformer pressure regulation no-load voltage ratio, comprises the following steps：
According to primary side input voltage amplitude, secondary side current amplitude and the secondary side current phase value of distribution transformer
Calculate initial distribution transformer pressure regulation no-load voltage ratio；
It is inclined that voltage is obtained according to the instantaneous effective values of standard voltage value and the secondary side output voltage of the distribution transformer
Difference；
If the voltage deviation value exceeds predeterminated voltage deviation threshold, the voltage deviation value and the default electricity are obtained
Press the difference of deviation threshold；
Integration is carried out to the difference and obtains integrated value, according to the integrated value compensation initial distribution transformer pressure regulation
No-load voltage ratio obtains distribution transformer pressure regulation no-load voltage ratio.
The detection method of above-mentioned distribution transformer pressure regulation no-load voltage ratio, according to voltage deviation value and the difference of predeterminated voltage deviation threshold
Value adjusts distribution transformer pressure regulation no-load voltage ratio in real time, improves the switch speed and accuracy of distribution transformer pressure regulation no-load voltage ratio, meets
Requirement of the electronic power switch to rapidity and accuracy, can rapidly, accurately control electric power electric according to pressure regulation no-load voltage ratio
Sub switch, effectively adjusts distribution transformer output voltage, and the design for power electronics formula load tap changing distribution transformer provides
Basis.
In one of the embodiments, it is described according to standard voltage value and the secondary side output voltage of the distribution transformer
Instantaneous effective values obtain voltage deviation value step after, it is further comprising the steps of：
If the voltage deviation value is in predeterminated voltage deviation threshold, the currently practical no-load voltage ratio conduct of distribution transformer
The distribution transformer pressure regulation no-load voltage ratio.
In one of the embodiments, the primary side input voltage amplitude according to distribution transformer, secondary side current
The step of amplitude and secondary side current phase value calculate initial distribution transformer pressure regulation no-load voltage ratio, comprises the following steps：
Distribution transformer model is established according to a secondary side circuit structure of the distribution transformer, is become according to the distribution
Depressor model obtains distribution transformer pressure regulation no-load voltage ratio computation model；
Utilize primary side input voltage amplitude, secondary side current amplitude and the secondary side current phase of the distribution transformer
Place value calculates initial distribution transformer pressure regulation no-load voltage ratio according to the distribution transformer pressure regulation no-load voltage ratio computation model.
In one of the embodiments, the distribution transformer pressure regulation no-load voltage ratio computation model is as follows：
Wherein, VrefFor standard voltage value, V1For the primary side input voltage amplitude of distribution transformer, I2And θIRespectively match somebody with somebody
The secondary side current amplitude and phase of piezoelectric transformer, Z and θZThe respectively amplitude and phase of circuit impedance summation.
In one of the embodiments, the detection method of distribution transformer pressure regulation no-load voltage ratio is further comprising the steps of：
Obtain the fundametal compoment and harmonic component of secondary side output voltage；
The distribution is calculated using numerical matrix according to the fundametal compoment of the secondary side output voltage and harmonic component
The instantaneous effective values of the secondary side output voltage of transformer.
In one of the embodiments, the detection method of distribution transformer pressure regulation no-load voltage ratio is further comprising the steps of：
Obtain poor distribution transformer nominal transformation ratio, adjacent taps no-load voltage ratio, distribution transformer primary side voltage maximum amplitude, most
Big tap number；
Using the distribution transformer nominal transformation ratio, adjacent taps no-load voltage ratio is poor, distribution transformer primary side voltage most significantly
Value, maximum number of taps calculate predeterminated voltage deviation threshold according to following formula：
Wherein, V1maxFor distribution transformer primary side voltage maximum amplitude, a0For initial distribution transformer pressure regulation no-load voltage ratio, △ a
Poor, the n for adjacent taps no-load voltage ratiomaxFor maximum number of taps.
A kind of detecting system of distribution transformer pressure regulation no-load voltage ratio, including：
Pressure regulation no-load voltage ratio acquisition module, for the primary side input voltage amplitude according to distribution transformer, secondary side current width
Value and secondary side current phase value calculate initial distribution transformer pressure regulation no-load voltage ratio；
Voltage deviation value acquisition module, for the secondary side output voltage according to standard voltage value and the distribution transformer
Instantaneous effective values obtain voltage deviation value；
Pressure regulation judgment module, if exceeding predeterminated voltage deviation threshold for the voltage deviation value, obtains the voltage
The difference of deviation and the predeterminated voltage deviation threshold；
Pressure regulation no-load voltage ratio compensating module, obtains integrated value for carrying out integration to the difference, is compensated according to the integrated value
The initial distribution transformer pressure regulation no-load voltage ratio obtains distribution transformer pressure regulation no-load voltage ratio.
The detecting system of above-mentioned distribution transformer pressure regulation no-load voltage ratio, according to voltage deviation value and the difference of predeterminated voltage deviation threshold
Value adjusts distribution transformer pressure regulation no-load voltage ratio in real time, rapidly, accurately controls electronic power switch according to pressure regulation no-load voltage ratio, meets electricity
Requirement of the power electronic cutting concern to rapidity and accuracy, can effectively adjust distribution transformer output voltage, be electric power electricity
The design of minor load tap changing distribution transformer provides the foundation.
A kind of control method of distribution transformer, comprises the following steps：
Distribution transformer pressure regulation no-load voltage ratio is detected using the detection method of above-mentioned distribution transformer pressure regulation no-load voltage ratio；
The break-make of electronic power switch in distribution transformer is controlled according to the distribution transformer pressure regulation no-load voltage ratio, switching is taken out
Head.
The control method of above-mentioned distribution transformer, control electronic power switch is removed by obtaining distribution transformer pressure regulation no-load voltage ratio
Break-make, realize the switching of tap, wherein, distribution transformer pressure regulation no-load voltage ratio is adjusted according to circuit actual conditions, distribution become
The switch speed and accuracy of depressor pressure regulation no-load voltage ratio are improved, and meet electronic power switch to rapidity and accuracy
Requirement, can quickly and accurately control electronic power switch so that distribution transformer effectively adjust distribution transformer output electricity
Pressure.
In one of the embodiments, it is described that power electronics in distribution transformer is controlled according to the distribution transformer no-load voltage ratio
The step of switching on-off, switching tap, comprises the following steps：
If the primary side voltage magnitude reaches zero point, numeral conversion is carried out to the distribution transformer pressure regulation no-load voltage ratio and is obtained
The tap no-load voltage ratio of the distribution transformer；
The break-make of electronic power switch in the distribution transformer is controlled according to the tap no-load voltage ratio, switches tap.
A kind of distribution transformer, including power electronics formula on-load voltage regulation distribution transforming device and the control of distribution transformer pressure regulation no-load voltage ratio
Device, wherein, the distribution transformer pressure regulation no-load voltage ratio has using the control method control power electronics formula of above-mentioned distribution transformer
Voltage adjustment of on-load distribution transforming device switches tap.
Above-mentioned distribution transformer, obtains distribution transformer pressure regulation no-load voltage ratio by distribution transformer pressure regulation no-load voltage ratio controller and goes to control
The break-make of electronic power switch in power electronics formula on-load voltage regulation distribution transforming device processed, realizes that power electronics formula on-load voltage regulation distribution transforming device is taken out
The switching of head, wherein, distribution transformer pressure regulation no-load voltage ratio is adjusted according to circuit actual conditions, distribution transformer pressure regulation no-load voltage ratio
Switch speed and accuracy are improved, and meet requirement of the electronic power switch to rapidity and accuracy, can be fast
Fast ground, control electronic power switch exactly so that voltage adjustment of on-load distribution transformer effectively adjusts distribution transformer output voltage.
Brief description of the drawings
Fig. 1 is the flow chart of the detection method of distribution transformer pressure regulation no-load voltage ratio in one embodiment of the invention；
Fig. 2 is one embodiment of the invention medium-voltage distribution transformer illustraton of model；
Fig. 3 is the structure diagram of the detecting system of distribution transformer pressure regulation no-load voltage ratio in one embodiment of the invention；
Fig. 4 is the graph of a relation of distribution transformer pressure regulation no-load voltage ratio and tap no-load voltage ratio in one embodiment of the invention；
Fig. 5 is the structure diagram of the distribution transformer of one embodiment of the invention；
Fig. 6 is the structure diagram of the distribution transformer of another embodiment of the present invention；
Fig. 7 inputs graph of a relation for the output of pressure regulation judgment module in the distribution transformer of another embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not intended to limit the scope of the invention.
Referring to Fig. 1, Fig. 1 is the flow chart of the detection method of distribution transformer pressure regulation no-load voltage ratio in one embodiment of the invention,
The detection method of distribution transformer pressure regulation no-load voltage ratio, comprises the following steps in the embodiment：
Step S110：According to primary side input voltage amplitude, secondary side current amplitude and the secondary side of distribution transformer
Current phase value calculates initial distribution transformer pressure regulation no-load voltage ratio.
In this step, distribution transformer is generally made of iron core and coil, and coil has two or more windings, and one
Secondary side is the winding for connecing power supply, and secondary side is remaining winding.
Step S120：Electricity is obtained according to the instantaneous effective values of standard voltage value and the secondary side output voltage of distribution transformer
Press deviation.
Step S130：If voltage deviation value exceeds predeterminated voltage deviation threshold, voltage deviation value and predeterminated voltage are obtained
The difference of deviation threshold.
Step S140：Integration is carried out to difference and obtains integrated value, compensating initial distribution transformer pressure regulation according to integrated value becomes
Than obtaining distribution transformer pressure regulation no-load voltage ratio.
In the present embodiment, distribution transformer tune is adjusted according to the difference of voltage deviation value and predeterminated voltage deviation threshold in real time
Buckling ratio, improve distribution transformer pressure regulation no-load voltage ratio switch speed and accuracy, meet electronic power switch to rapidity with
And the requirement of accuracy, electronic power switch can rapidly, accurately be controlled according to distribution transformer pressure regulation no-load voltage ratio, effectively adjusted
Distribution transformer output voltage is saved, is provided the foundation for the design of power electronics formula load tap changing distribution transformer.
Specifically, according to distribution transformer primary side input voltage amplitude, distribution transformer secondary side current amplitude and
Phase, can be calculated initial transformer regulating no-load voltage ratio.When being calculated in view of distribution transformer pressure regulation no-load voltage ratio, circuitous resistance with
And primary side input voltage is arranged to definite value, but it is in actual distribution transformer circuitous resistance and primary side input voltage
Constantly change, can cause initial distribution transformer pressure regulation no-load voltage ratio not necessarily can be by the secondary side output voltage of distribution transformer
Adjust to standard voltage value, it is necessary to introduce offset.
Since the tap of distribution transformer is discrete, to ensure that voltage deviation is inclined less than the voltage before pressure regulation after pressure regulation
Difference, need to carry out pressure regulation judgement according to distribution transformer secondary side output voltage deviation.First by standard voltage value and distribution transformer
Device secondary side output voltage instantaneous effective values obtain voltage deviation △ V, when voltage deviation value △ V exceed predeterminated voltage deviation threshold
The difference △ V-DB of output voltage deviation and predeterminated voltage deviation threshold are sharp after being integrated to difference to integrator during DB
Initial distribution transformer pressure regulation no-load voltage ratio is compensated with integrated value；Wherein, by voltage deviation value and predeterminated voltage deviation threshold
Difference is integrated, and the delay of distribution transformer pressure regulation no-load voltage ratio detection can be reduced using integrated value compensation pressure regulation no-load voltage ratio, is improved
The switch speed of distribution transformer pressure regulation no-load voltage ratio.
In one of the embodiments, had according to the instantaneous of the secondary side output voltage of standard voltage value and distribution transformer
It is further comprising the steps of after valid value obtains voltage deviation value step：
If voltage deviation value, in predeterminated voltage deviation threshold, the currently practical no-load voltage ratio of distribution transformer is as distribution transformer
Device pressure regulation no-load voltage ratio.
In the present embodiment, when voltage deviation value △ V are within the scope of predeterminated voltage deviation threshold DB, distribution transformer is current
Actual no-load voltage ratio to ensure voltage deviation minimum, that is, ensures that the secondary side of distribution transformer is defeated as distribution transformer pressure regulation no-load voltage ratio
Go out voltage close to standard voltage value, improve the accuracy of distribution transformer pressure regulation no-load voltage ratio, can be controlled exactly according to pressure regulation no-load voltage ratio
Electronic power switch processed, effectively adjusts distribution transformer output voltage, prevents power distribution network low-voltage problem.
In one of the embodiments, according to primary side input voltage amplitude, the secondary side current amplitude of distribution transformer
And secondary side current phase value calculates initial distribution transformer pressure regulation no-load voltage ratio step, comprises the following steps：
Distribution transformer model is established according to a secondary side circuit structure of distribution transformer, according to distribution transformer model
Obtain distribution transformer pressure regulation no-load voltage ratio computation model；
Utilize primary side input voltage amplitude, secondary side current amplitude and the secondary side current phase value of distribution transformer
Initial distribution transformer pressure regulation no-load voltage ratio is calculated according to distribution transformer pressure regulation no-load voltage ratio computation model.
In the present embodiment, by establishing distribution transformer pressure regulation no-load voltage ratio computation model, in the voltage and current that input collects
Corresponding distribution transformer pressure regulation no-load voltage ratio can be exported after data so that calculating process is simple and efficient.
Specifically, according to a secondary side circuit structure of distribution transformer, the output of distribution transformer secondary side can be obtained
Voltage is shown below：
Wherein,For Circuit Fault on Secondary Transformer output voltage,For transformer primary side input voltage, a is transformer voltage ratio,
aminFor transformer minimum no-load voltage ratio, amaxFor transformer maximum no-load voltage ratio,For Circuit Fault on Secondary Transformer electric current, ZTHindered for transformer winding
Anti- summation, ZCThe summation of transmission line impedance between pressure regulation busbar and transformer.Therefore, press-fitting piezoelectric transformer model is established
Referring to Fig. 2.Distribution transformer effect is by distribution transformer secondary side output voltage quick regulation to standard value, then with voltage
Standard value obtains the computation model of distribution transformer pressure regulation no-load voltage ratio as Circuit Fault on Secondary Transformer output voltage.
In one of the embodiments, distribution transformer pressure regulation no-load voltage ratio computation model is as follows：
Wherein, VrefFor standard voltage value, V1For the primary side input voltage amplitude of distribution transformer, I2And θIRespectively match somebody with somebody
The secondary side current amplitude and phase of piezoelectric transformer, Z and θZThe respectively amplitude and phase of circuit impedance summation.
Specifically, standard voltage value VrefAs Circuit Fault on Secondary Transformer output voltage, according to The computation model of distribution transformer pressure regulation no-load voltage ratio can be obtained as shown in above formula.
In one of the embodiments, the instantaneous effective values of secondary side output voltage can be obtained according to following steps：
Obtain the fundametal compoment and harmonic component of secondary side output voltage；
Distribution transformer is calculated using numerical matrix according to the fundametal compoment of secondary side output voltage and harmonic component
The instantaneous effective values of secondary side output voltage.
In the present embodiment, the fundametal compoment and harmonic component of secondary side output voltage are obtained, numerical matrix can be passed through
Calculate instantaneous effective values.
Specifically, the measured value of distribution transformer secondary side output voltage is made of fundametal compoment and multiple harmonic components,
This example considers fundametal compoment and 5 order harmonic components, then distribution transformer secondary side output voltage can be expressed as：
Wherein, | u1|、ω1、θ1For the amplitude, angular frequency and initial phase of fundametal compoment, ω1For 50 hertz, | u5|、ω5、
θ5For the amplitude, angular frequency and initial phase of 5 order harmonic components, ω5For 250 hertz, t is the sampling time, TsFor the sampling period,
upresentFor voltage magnitude under sampling time t, upast1It is (t-Ts) voltage magnitude under the time, upast2It is (t-2Ts) electricity under the time
Pressure amplitude value, upast3It is (t-3Ts) voltage magnitude under the time.Fundametal compoment and 5 order harmonic components are solved using numerical matrix method
Amplitude and phase, shown in following (4) and (5) formula institute：
According to the four of distribution transformer output voltage sampled points, the instantaneous effective values V of output voltage can be obtained2mFor：
Find out from above-mentioned calculating formula, two unknown parameters (amplitude and phase) can be increased by introducing a harmonic component, because
If this considers that a harmonic component will need to increase by 2 sampled points to obtain the instantaneous of distribution transformer secondary side output voltage more
Virtual value, in actual application, sets according to requirement of the instantaneous effective values of voltage to precision and the requirement of calculating speed
Put the number of harmonic component.
In one of the embodiments, voltage deviation threshold value can be obtained by following steps：
Obtain poor distribution transformer nominal transformation ratio, adjacent taps no-load voltage ratio, distribution transformer primary side voltage maximum amplitude, most
Big tap number；
Using distribution transformer nominal transformation ratio, adjacent taps no-load voltage ratio is poor, distribution transformer primary side voltage maximum amplitude, most
Big tap number calculates predeterminated voltage deviation threshold according to following formula：
Wherein, V1maxFor distribution transformer primary side voltage maximum amplitude, a0For distribution transformer nominal transformation ratio, △ a are phase
Adjacent tap no-load voltage ratio is poor, nmaxFor maximum number of taps.
In the present embodiment, since the tap of distribution transformer is discrete, to ensure that voltage deviation is less than tune after pressure regulation
Voltage deviation before pressure, need to judge according to distribution transformer secondary side output voltage deviation compared with voltage deviation threshold value,
If voltage deviation is too small, modulation can not be compensated to distribution transformer pressure regulation no-load voltage ratio, to improve distribution transformer pressure regulation change
The accuracy of ratio.
As soon as specifically, a transformer has the winding of multiple series connection, the tie point for winding of connecting is picked out into lead tap,
The no-load voltage ratio difference of adjacent taps is constant, so according to distribution transformer nominal transformation ratio, adjacent taps no-load voltage ratio is poor, distribution transformer
The value range of the data acquisition voltage deviation threshold value such as primary side voltage maximum amplitude and maximum number of taps, in practical application
When, an appropriate value is chosen as predeterminated voltage deviation threshold according to the value range.
According to the detection method of above-mentioned distribution transformer pressure regulation no-load voltage ratio, the present invention also provides a kind of distribution transformer pressure regulation change
The detecting system of ratio, just the embodiment of the detecting system of the distribution transformer pressure regulation no-load voltage ratio of the present invention is described in detail below.
Referring to Fig. 3, Fig. 3 is the structural representation of the detecting system of distribution transformer pressure regulation no-load voltage ratio in one embodiment of the invention
Figure.In the present embodiment, the detecting system of distribution transformer pressure regulation no-load voltage ratio, including：
Pressure regulation no-load voltage ratio acquisition module 210, for the primary side input voltage amplitude according to distribution transformer, secondary side current
Amplitude and secondary side current phase value calculate initial distribution transformer pressure regulation no-load voltage ratio；
Voltage deviation value acquisition module 220, for the secondary side output voltage according to standard voltage value and distribution transformer
Instantaneous effective values obtain voltage deviation value；
Pressure regulation judgment module 230, if exceeding predeterminated voltage deviation threshold for voltage deviation value, obtains voltage deviation value
With the difference of predeterminated voltage deviation threshold；
Pressure regulation no-load voltage ratio compensating module 240, obtains integrated value for carrying out integration to difference, is initially matched somebody with somebody according to integrated value compensation
Piezoelectric transformer pressure regulation no-load voltage ratio obtains distribution transformer pressure regulation no-load voltage ratio.
In the present embodiment, distribution transformer tune is adjusted according to the difference of voltage deviation value and predeterminated voltage deviation threshold in real time
Buckling ratio, electronic power switch is rapidly, accurately controlled according to pressure regulation no-load voltage ratio, meet electronic power switch cut to rapidity with
And the requirement of accuracy, distribution transformer output voltage can be effectively adjusted, is power electronics formula load tap changing distribution transformer
Design provide the foundation.
In one of the embodiments, pressure regulation judgment module 230 in voltage deviation value in predeterminated voltage deviation threshold
When, then the currently practical no-load voltage ratio of distribution transformer is as distribution transformer pressure regulation no-load voltage ratio.
In one of the embodiments, pressure regulation no-load voltage ratio acquisition module 210 is according to a secondary side circuit knot of distribution transformer
The vertical distribution transformer model of structure, distribution transformer pressure regulation no-load voltage ratio computation model is obtained according to distribution transformer model；Using with
Primary side input voltage amplitude, secondary side current amplitude and the secondary side current phase value of piezoelectric transformer are according to distribution transformer
Pressure regulation no-load voltage ratio computation model calculates distribution transformer pressure regulation no-load voltage ratio.
In one of the embodiments, distribution transformer pressure regulation no-load voltage ratio computation model is such as in pressure regulation no-load voltage ratio acquisition module 210
Under：
Wherein, VrefFor standard voltage value, V1For the primary side input voltage amplitude of distribution transformer, I2And θIRespectively match somebody with somebody
The secondary side current amplitude and phase of piezoelectric transformer, Z and θZThe respectively amplitude and phase of circuit impedance summation.
In one of the embodiments, voltage deviation value acquisition module 220 obtains the fundametal compoment of secondary side output voltage
And harmonic component；Distribution transformer is calculated using numerical matrix according to the fundametal compoment of secondary side output voltage and harmonic component
The instantaneous effective values of the secondary side output voltage of device.
In one of the embodiments, pressure regulation judgment module 230 obtains distribution transformer nominal transformation ratio, adjacent taps no-load voltage ratio
Difference, distribution transformer primary side voltage maximum amplitude, maximum number of taps；Become using distribution transformer nominal transformation ratio, adjacent taps
Than poor, distribution transformer primary side voltage maximum amplitude, maximum number of taps predeterminated voltage deviation threshold is calculated according to following formula：
Wherein, V1maxFor distribution transformer primary side voltage maximum amplitude, a0For distribution transformer nominal transformation ratio, △ a are phase
Adjacent tap no-load voltage ratio is poor, nmaxFor maximum number of taps.
The inspection of the detecting system of the distribution transformer pressure regulation no-load voltage ratio of the present invention and the distribution transformer pressure regulation no-load voltage ratio of the present invention
Survey method correspond, above-mentioned distribution transformer pressure regulation no-load voltage ratio detection method embodiment illustrate technical characteristic and its have
Beneficial effect suitable for the embodiment of the detecting system of distribution transformer pressure regulation no-load voltage ratio, hereby give notice that.
In one of the embodiments, the present invention also provides a kind of control method of distribution transformer, the distribution transformer
Control method comprise the following steps：
Distribution transformer pressure regulation no-load voltage ratio is detected using the detection method of any of the above-described distribution transformer pressure regulation no-load voltage ratio；
The break-make of electronic power switch in distribution transformer is controlled according to distribution transformer pressure regulation no-load voltage ratio, switches tap.
In the present embodiment, the break-make of control electronic power switch is gone by obtaining distribution transformer pressure regulation no-load voltage ratio, realizes and takes out
The switching of head, wherein, distribution transformer pressure regulation no-load voltage ratio is adjusted according to circuit actual conditions, distribution transformer pressure regulation no-load voltage ratio
Switch speed and accuracy are improved, and meet requirement of the electronic power switch to rapidity and accuracy, can be fast
Fast ground, control electronic power switch exactly so that distribution transformer effectively adjusts distribution transformer output voltage.
In one of the embodiments, the logical of electronic power switch in distribution transformer is controlled according to distribution transformer no-load voltage ratio
The step of breaking, switching tap, comprises the following steps：
If primary side voltage magnitude reaches zero point, numeral conversion is carried out to distribution transformer pressure regulation no-load voltage ratio and obtains distribution transformer
The tap no-load voltage ratio of device；
The break-make of electronic power switch in distribution transformer is controlled according to tap no-load voltage ratio, switches tap.
In the present embodiment, the tap no-load voltage ratio that numeral conversion obtains distribution transformer is carried out to distribution transformer pressure regulation no-load voltage ratio,
The break-make of electronic power switch is controlled according to tap no-load voltage ratio, can rapidly, accurately control electronic power switch so that distribution
Transformer effectively adjusts distribution transformer output voltage.
Specifically, since transformer tapping is discrete, and obtained by the detection method of distribution transformer pressure regulation no-load voltage ratio
The distribution transformer pressure regulation no-load voltage ratio obtained is continuously to be worth, so needing to carry out numeral turn to the distribution transformer pressure regulation no-load voltage ratio of acquisition
Change, obtain tap no-load voltage ratio.Meanwhile in order to reduce impact of the tap changing process to electronic power switch, obtaining pressure regulation no-load voltage ratio
Afterwards, zero passage detection is carried out to transformer primary side voltage, in primary side voltage over zero, electric power electricity is controlled according to tap no-load voltage ratio
Sub switch break-make realizes tap changing.
Further, numeral is carried out to the distribution transformer pressure regulation no-load voltage ratio of acquisition according to no-load voltage ratio absolute difference minimum principle
Conversion obtains tap no-load voltage ratio, and distribution transformer pressure regulation no-load voltage ratio and the relation of tap no-load voltage ratio are as shown in Figure 4.
In one of the embodiments, the present invention also provides a kind of distribution transformer, referring to Fig. 5, Fig. 5 is one of the invention
The structure diagram of the distribution transformer of embodiment；Distribution transformer in the present embodiment includes power electronics formula on-load voltage regulation
Distribution transforming device 310 and distribution transformer pressure regulation no-load voltage ratio controller 320, wherein, distribution transformer pressure regulation no-load voltage ratio controller 320 utilizes
The control method control power electronics formula on-load voltage regulation distribution transforming device switching tap of above-mentioned distribution transformer.
In the present embodiment, distribution transformer pressure regulation no-load voltage ratio is obtained by distribution transformer pressure regulation no-load voltage ratio controller 320 and goes to control
The break-make of electronic power switch, realizes power electronics formula on-load voltage regulation distribution transforming in power electronics formula on-load voltage regulation distribution transforming device 310 processed
The switching of 310 tap of device, wherein, distribution transformer pressure regulation no-load voltage ratio is adjusted according to circuit actual conditions, distribution transformer tune
Buckling than switch speed and accuracy be improved, meet electronic power switch and rapidity and accuracy wanted
Ask, can rapidly, accurately control electronic power switch so that distribution transformer effectively adjusts distribution transformer output electricity
Pressure.
Referring to Fig. 6, Fig. 6 is the structure diagram of the distribution transformer of another embodiment of the present invention；In the present embodiment, match somebody with somebody
Piezoelectric transformer pressure regulation no-load voltage ratio controller 320 includes feedforward control module 321, integration module 322, pressure regulation judgment module 323, voltage
Instantaneous effective values computing module 324, sampling and memory module 325, digital converter module 326 and zero passage detection module 327.
Wherein, according to a secondary side circuit structure of distribution transformer, distribution transformer secondary side output electricity can be obtained
Pressure is shown below：
Wherein,For Circuit Fault on Secondary Transformer output voltage,For transformer primary side input voltage, a is transformer voltage ratio,
aminFor transformer minimum no-load voltage ratio, amaxFor transformer maximum no-load voltage ratio,For Circuit Fault on Secondary Transformer electric current, ZTHindered for transformer winding
Anti- summation, ZCThe summation of transmission line impedance between pressure regulation busbar and transformer.Distribution transformer effect is to become distribution
Depressor secondary side output voltage quick regulation is to standard value, then using standard voltage value as Circuit Fault on Secondary Transformer output voltage,
According toThe computation model that can obtain distribution transformer pressure regulation no-load voltage ratio obtains distribution
Shown in following (9) formula of the computation model of transformer regulating no-load voltage ratio, the calculating formula using the computation model as feedforward control module 321
Son.
Wherein, VrefFor standard voltage value, V1For the primary side input voltage amplitude of distribution transformer, I2And θIRespectively match somebody with somebody
The secondary side current amplitude and phase of piezoelectric transformer, Z and θZThe respectively amplitude and phase of circuit impedance summation.
Input transformer primary side input voltage amplitude V1, Circuit Fault on Secondary Transformer current amplitude I2With phase value θITo feedforward
Control module 321, exports initial transformer regulating no-load voltage ratio a.
Error and input voltage of the circuitous resistance for definite value introducing are thought when being calculated in view of distribution transformer pressure regulation no-load voltage ratio
V1Measurement error, on the basis of the output of feedforward control module 321, introduce integration module 322 and compensate, wherein integration module
322 gain is determined by system emulation.
Since the tap of distribution transformer is discrete, to ensure that voltage deviation is inclined less than the voltage before pressure regulation after pressure regulation
Difference is, it is necessary to which pressure regulation judgment module 323 carries out pressure regulation judgement to distribution transformer output voltage deviation.First by standard voltage value
VrefThe distribution transformer secondary side output voltage instantaneous effective values V of gained is calculated with voltage transient virtual value computing module 3242m
Voltage deviation △ V are obtained, referring then to Fig. 7, Fig. 7 is that the output of pressure regulation judgment module 323 inputs graph of a relation, according to such as Fig. 7 institutes
The input/output relation shown carries out pressure regulation, i.e., output is 0 when △ V belong to [- DB, DB], defeated when △ V belong to (- ∞ ,-DB)
Go out for △ V+DB, when △ V belong to (DB ,+∞), output is △ V-DB, and wherein DB is voltage deviation threshold value, and value is：
Wherein, V1maxFor distribution transformer primary side voltage maximum amplitude, a0For distribution transformer nominal transformation ratio, △ a are phase
Adjacent tap no-load voltage ratio is poor, nmaxFor maximum number of taps.
In distribution transformer, the corresponding electronic power switch on off operating mode of each tap need to be stored, to reduce
Impact of the tap changing process to electronic power switch, sampling store the pressure regulation information of pressure regulation no-load voltage ratio, zero passage with memory module 325
Detection module 327 carries out zero passage detection to transformer primary side voltage, then according to distribution transformer electronic power switch break-make
State and pressure regulation information, tap changing is realized in voltage over zero.
Since transformer tapping is discrete, and the pressure regulation no-load voltage ratio that control system obtains is continuously to be worth, so according to
No-load voltage ratio absolute difference minimum principle, referring to Fig. 4, the graph of a relation of distribution transformer pressure regulation no-load voltage ratio and tap no-load voltage ratio, numeral conversion
The pressure regulation no-load voltage ratio that device module 326 obtains control system carries out digital conversion, 310 basis of power electronics formula on-load voltage regulation distribution transforming device
Tap, which becomes to compare, carries out tap changing.
In one embodiment, a kind of computer equipment is also provided, which includes memory, processor and deposit
Storage on a memory and the computer program that can run on a processor, wherein, when processor executive program realize as it is above-mentioned respectively
The detection method of any one distribution transformer pressure regulation no-load voltage ratio in embodiment.
The computer equipment, during its processor executive program, by realizing that any one in the various embodiments described above such as is matched somebody with somebody
The detection method of piezoelectric transformer pressure regulation no-load voltage ratio, so as to real-time according to voltage deviation value and the difference of predeterminated voltage deviation threshold
Distribution transformer pressure regulation no-load voltage ratio is adjusted, improves the switch speed and accuracy of distribution transformer pressure regulation no-load voltage ratio, meets electric power electricity
Requirement of the sub switch to rapidity and accuracy, can rapidly, accurately control electronic power switch according to pressure regulation no-load voltage ratio,
Distribution transformer output voltage is effectively adjusted, is provided the foundation for the design of power electronics formula load tap changing distribution transformer.
In addition, one of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method,
It is that relevant hardware can be instructed to complete by computer program, the program can be stored in a non-volatile calculating
In machine read/write memory medium, in the embodiment of the present invention, which can be stored in the storage medium of computer system, and by
At least one processor in the computer system performs, to realize the detection included such as above-mentioned each distribution transformer pressure regulation no-load voltage ratio
The flow of the embodiment of detection method.
In one embodiment, a kind of storage medium is also provided, is stored thereon with computer program, wherein, the program quilt
Realized when processor performs such as the detection method of any one distribution transformer pressure regulation no-load voltage ratio in the various embodiments described above.Wherein,
The storage medium can be magnetic disc, CD, read-only memory (Read-Only Memory, ROM) or random storage note
Recall body (Random Access Memory, RAM) etc..
The computer-readable storage medium, its computer program stored, includes such as above-mentioned each distribution transformer tune by realizing
Buckling than detection method embodiment flow, so as to the difference according to voltage deviation value and predeterminated voltage deviation threshold
Distribution transformer pressure regulation no-load voltage ratio is adjusted in real time, improves the switch speed and accuracy of distribution transformer pressure regulation no-load voltage ratio, meets electricity
Requirement of the power electronic switch to rapidity and accuracy, can rapidly, accurately control power electronics according to pressure regulation no-load voltage ratio
Switch, effectively adjusts distribution transformer output voltage, and the design for power electronics formula load tap changing distribution transformer provides base
Plinth.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, its description is more specific and detailed, but simultaneously
Cannot therefore it be construed as limiting the scope of the patent.It should be pointed out that come for those of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of detection method of distribution transformer pressure regulation no-load voltage ratio, it is characterised in that comprise the following steps：
Calculated according to the primary side input voltage amplitude, secondary side current amplitude and secondary side current phase value of distribution transformer
Initial distribution transformer pressure regulation no-load voltage ratio；
Voltage deviation value is obtained according to the instantaneous effective values of standard voltage value and the secondary side output voltage of the distribution transformer；
If the voltage deviation value exceeds predeterminated voltage deviation threshold, obtain the voltage deviation value and the predeterminated voltage is inclined
The difference of poor threshold value；
Integration is carried out to the difference and obtains integrated value, according to the integrated value compensation initial distribution transformer pressure regulation no-load voltage ratio
Obtain distribution transformer pressure regulation no-load voltage ratio.
2. the detection method of distribution transformer pressure regulation no-load voltage ratio according to claim 1, it is characterised in that described according to voltage
After the instantaneous effective values of the secondary side output voltage of standard value and the distribution transformer obtain voltage deviation value step, also wrap
Include following steps：
If the voltage deviation value, in predeterminated voltage deviation threshold, the currently practical no-load voltage ratio of distribution transformer is as the distribution
Transformer regulating no-load voltage ratio.
3. the detection method of distribution transformer pressure regulation no-load voltage ratio according to claim 1, it is characterised in that described according to distribution
Primary side input voltage amplitude, secondary side current amplitude and the secondary side current phase value of transformer calculate initial distribution transformer
The step of device pressure regulation no-load voltage ratio, comprise the following steps：
Distribution transformer model is established according to a secondary side circuit structure of the distribution transformer, according to the distribution transformer
Model obtains distribution transformer pressure regulation no-load voltage ratio computation model；
Utilize primary side input voltage amplitude, secondary side current amplitude and the secondary side current phase value of the distribution transformer
Initial distribution transformer pressure regulation no-load voltage ratio is calculated according to the distribution transformer pressure regulation no-load voltage ratio computation model.
4. the detection method of distribution transformer pressure regulation no-load voltage ratio according to claim 3, it is characterised in that the distribution transformer
Device pressure regulation no-load voltage ratio computation model is as follows：
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<mn>2</mn>
</msup>
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<mi>&theta;</mi>
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Wherein, VrefFor standard voltage value, V1For the primary side input voltage amplitude of distribution transformer, I2And θIRespectively distribution becomes
The secondary side current amplitude and phase of depressor, Z and θZThe respectively amplitude and phase of circuit impedance summation.
5. the detection method of distribution transformer pressure regulation no-load voltage ratio according to claim 1, it is characterised in that further include following step
Suddenly：
Obtain the fundametal compoment and harmonic component of secondary side output voltage；
The distribution transformer is calculated using numerical matrix according to the fundametal compoment of the secondary side output voltage and harmonic component
The instantaneous effective values of the secondary side output voltage of device.
6. the detection method of distribution transformer pressure regulation no-load voltage ratio according to claim 1, it is characterised in that further include following step
Suddenly：
Obtain poor distribution transformer nominal transformation ratio, adjacent taps no-load voltage ratio, distribution transformer primary side voltage maximum amplitude, maximum pumping
Head number；
Using the distribution transformer nominal transformation ratio, adjacent taps no-load voltage ratio is poor, distribution transformer primary side voltage maximum amplitude, most
Big tap number calculates predeterminated voltage deviation threshold according to following formula：
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<mo>&times;</mo>
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Wherein, V1maxFor distribution transformer primary side voltage maximum amplitude, a0For distribution transformer nominal transformation ratio, △ a are adjacent pumping
Head no-load voltage ratio is poor, nmaxFor maximum number of taps.
A kind of 7. detecting system of distribution transformer pressure regulation no-load voltage ratio, it is characterised in that including：
Pressure regulation no-load voltage ratio acquisition module, for the primary side input voltage amplitude according to distribution transformer, secondary side current amplitude with
And secondary side current phase value calculates initial distribution transformer pressure regulation no-load voltage ratio；
Voltage deviation value acquisition module, for the wink according to standard voltage value and the secondary side output voltage of the distribution transformer
When virtual value obtain voltage deviation value；
Pressure regulation judgment module, if exceeding predeterminated voltage deviation threshold for the voltage deviation value, obtains the voltage deviation
The difference of value and the predeterminated voltage deviation threshold；
Pressure regulation no-load voltage ratio compensating module, obtains integrated value, according to integrated value compensation for carrying out integration to the difference
Initial distribution transformer pressure regulation no-load voltage ratio obtains distribution transformer pressure regulation no-load voltage ratio.
8. a kind of control method of distribution transformer, it is characterised in that comprise the following steps：
Distribution transformer tune is detected using the detection method of claim 1 to 6 any one of them distribution transformer pressure regulation no-load voltage ratio
Buckling ratio；
The break-make of electronic power switch in distribution transformer is controlled according to the distribution transformer pressure regulation no-load voltage ratio, switches tap.
9. the control method of distribution transformer according to claim 8, it is characterised in that described according to the distribution transformer
The step of break-make of electronic power switch in device no-load voltage ratio control distribution transformer, switching tap, comprise the following steps：
If the primary side voltage magnitude reaches zero point, the distribution transformer pressure regulation no-load voltage ratio is carried out described in numeral conversion acquisition
The tap no-load voltage ratio of distribution transformer；
The break-make of electronic power switch in the distribution transformer is controlled according to the tap no-load voltage ratio, switches tap.
10. a kind of voltage regulating distribution transformer, it is characterised in that including power electronics formula on-load voltage regulation distribution transforming device and distribution transformer
Device pressure regulation no-load voltage ratio controller, wherein, the distribution transformer pressure regulation no-load voltage ratio utilizes the distribution transformer described in claim 8 or 9
Control method control power electronics formula on-load voltage regulation distribution transforming device switching tap.
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| CN109061356A (en) * | 2018-09-26 | 2018-12-21 | 云南电网有限责任公司电力科学研究院 | A kind of detection method and device of distribution transformer operational taps |
| CN109991493A (en) * | 2019-03-25 | 2019-07-09 | 珠海格力电器股份有限公司 | Energy monitor method, apparatus, equipment and system |
| CN111953249A (en) * | 2020-08-26 | 2020-11-17 | 国网江西省电力有限公司电力科学研究院 | On-load tap changer parameter setting method considering voltage qualification rate |
| CN112165101A (en) * | 2020-09-24 | 2021-01-01 | 广东电网有限责任公司 | Control method, device and equipment of transformer and storage medium |
| CN112816754A (en) * | 2020-12-22 | 2021-05-18 | 深圳供电局有限公司 | Current compensation method and equipment for current transformer |
| CN116345536A (en) * | 2023-02-08 | 2023-06-27 | 广东电网有限责任公司佛山供电局 | On-load online voltage regulation method and device for distribution transformer |
| US11735923B2 (en) | 2020-07-28 | 2023-08-22 | Eaton Intelligent Power Limited | Voltage regulation device that includes a converter for harmonic current compensation and reactive power management |
| US11747841B2 (en) | 2018-08-20 | 2023-09-05 | Eaton Intelligent Power Limited | Current control apparatus |
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