CN106680631A - Transformer loading method, apparatus and system - Google Patents
Transformer loading method, apparatus and system Download PDFInfo
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- CN106680631A CN106680631A CN201611258634.2A CN201611258634A CN106680631A CN 106680631 A CN106680631 A CN 106680631A CN 201611258634 A CN201611258634 A CN 201611258634A CN 106680631 A CN106680631 A CN 106680631A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The embodiments of the invention disclose a transformer loading method, apparatus and system. The method includes the following steps: acquiring an object current and a power factor angle that require loading; based on the object current and the power factor angle, calculating the current component of the object current corresponding to a Parker coordinate axis; acquiring the sampling value of an output current of a first frequency converter, wherein the first frequency converter is connected to a secondary side of a transformer and is intended for loading the transformer; based on the current component and the sampling value, performing PI adjustment so as to generate PI adjustment voltage component; based on the PI adjustment voltage component, calculating an object voltage component on the Parker coordinate axis and based on the object voltage component, calculating an object voltage; based on the object voltage, transmitting PWM waves to the first frequency converter, outputting the object voltage by controlling the first frequency converter to load the transformer. The method achieves loading of the transformer through constant power and constant current so as to reduce energy consumption.
Description
Technical field
The present invention relates to field of power electronics, more particularly to a kind of loading method of transformator, apparatus and system.
Background technology
At present, the load test test of many transformators, majority is all to be directly connected to transformator with load, this mode
Power factor (PF) it is uncontrollable.Simultaneously for the needs of experiment, it is necessary to carry out difference to transformator by the size of regulating load
The loading of resistance, therefore loading current changes because needing ceaselessly to adjust the size of output data, power factor is uncontrollable
The waste of the energy is caused with the variation of loading current, while the structure of such experiment test system is more complicated, operation is compared
It is loaded down with trivial details.
The content of the invention
In view of this, The embodiment provides a kind of loading method of transformator, apparatus and system, it is intended to realize
Transformator is loaded to reduce energy loss by firm power and constant current.
In a first aspect, embodiments providing a kind of loading method of transformator, methods described includes：
Obtaining needs the target current and power-factor angle of loading；
The electric current on Parker's coordinate axess is corresponded to according to the target current and the power-factor angle calculating target current
Component；
The sampled value of the output current of the first converter is obtained, wherein first converter is connected to the transformator
Secondary, for loading to the transformator；
PI is carried out according to the current component and the sampled value to adjust to generate PI regulation component of voltages；
According to the target voltage component on PI regulation component of voltage calculating Parker's coordinate axess and according to the target
Component of voltage calculates target voltage；
PWM ripples are sent to first converter according to the target voltage, for by control first converter
Export the target voltage to load the transformator.
Second aspect, embodiments of the invention additionally provide a kind of charger of transformator, and described device includes：
First acquisition module, for obtaining the target current and power-factor angle that need loading；
First computing module, for calculating the target current according to the target current and power-factor angle handkerchief is corresponded to
Current component on gram coordinate axess；
Second acquisition module, for obtaining the sampled value of the output current of the first converter, wherein first converter
The secondary of the transformator is connected to, for loading to the transformator；
Generation module is adjusted, adjusts to generate PI regulation electricity for carrying out PI according to the current component and the sampled value
Pressure component；
Second computing module, according to the PI adjust component of voltage calculate Parker's coordinate axess on target voltage component and
Target voltage is calculated according to the target voltage component；
Controlled output module, for sending PWM ripples to first converter according to the target voltage, for by control
Make the first converter output target voltage to load the transformator.
The third aspect, embodiments of the invention additionally provide a kind of loading system of transformator, and the system includes：Transformation
Device, commutator, reactor, the first converter and the second converter, wherein the transformator is tested transformator；The transformator
Secondary be connected with the outfan of first converter by the reactor, the input of first converter with it is described
The outfan connection of commutator；The former limit of the transformator is connected by second converter with the outfan of the commutator
Connect；The input of the commutator is connected to electrical network；First converter includes main control unit, and the main control unit includes：
Above-mentioned charger.
Embodiments of the invention need the target current and power-factor angle of loading by obtaining, using power-factor angle meter
Calculate the current component that the target current is corresponded on Parker's coordinate axess；Obtain the sampled value of the output current of the first converter；
PI is carried out according to the current component and the sampled value to adjust to generate PI regulation component of voltages；Voltage is adjusted according to the PI
Component calculates the target voltage component on Parker's coordinate axess and then calculates target voltage；According to the target voltage to described first
Converter sends PWM ripples, for carrying out adding to the transformator by controlling the first converter output target voltage
Carry, so as to realize the loading to the transformator constant current and firm power factor, and then reduce energy loss.
Description of the drawings
In order to be illustrated more clearly that embodiment of the present invention technical scheme, below embodiment will be described needed for be used
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the present invention, general for this area
For logical technical staff, on the premise of not paying creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is a kind of structural representation of the loading system of transformator provided in an embodiment of the present invention；
Fig. 2 is a kind of equivalent circuit diagram of the loading system of transformator provided in an embodiment of the present invention；
Fig. 3 is a kind of schematic flow diagram of the loading method of transformator provided in an embodiment of the present invention；
Fig. 4 is the sub-step schematic flow diagram of step S103 in Fig. 3；
Fig. 5 is a kind of schematic block diagram of the charger of transformator provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than the embodiment of whole.Based on this
Embodiment in bright, the every other enforcement that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Fig. 1 is referred to, Fig. 1 is a kind of structural representation of the loading system of transformator provided in an embodiment of the present invention.Such as
Shown in Fig. 1, the loading system of the transformator includes transformator 11, reactor 12, the first converter 13, the second converter 14 and whole
Stream device 15, wherein transformator 11 be tested transformator, transformator as to be tested；The secondary of transformator 11 by reactor 12 with
The outfan connection of the first converter 13, the input of the first converter 13 is connected with the outfan of commutator 15；Transformator 11
Former limit be connected with the outfan of commutator 15 by the second converter 14；The input of commutator 15 is connected to electrical network 10；The
One converter 13 includes main control unit, and the main control unit is used to control the first converter 13.Additionally, in commutator 15 and electrical network 10
Between also can access rectifier transformer 16 and wiring cabinet 17 etc..In order to measure conveniently, can also reactor 12 and transformator 11 it
Between access measuring apparatus 18, for real-time measuring data.
Loading test is carried out by load relative to prior art, embodiments of the invention are realized by the first converter 13
Loading to transformator 11.First converter 13 is realized to transformator 11 by changing its output voltage amplitude and phase angle
Secondary current be controlled, and then realize the loading of firm power factor and constant current.Additionally, the second converter 14 is accessed
The former limit of transformator 11, can pass through to change the output voltage amplitude of the second converter 14 three-phase alternating current different with frequency replacement
Source, wishes that a loading test system can test different electric pressures with different rated frequencies so as to meet transformator producer
Transformator.
Above-mentioned loading system is equivalent into circuit diagram, it is concrete as shown in Fig. 2 Fig. 2 is one kind provided in an embodiment of the present invention
The equivalent circuit diagram of the loading system of transformator.L is reactor, and INV is the first converter, i1For the input electricity of transformer primary side
Stream, E1For the input voltage of transformer primary side, i2For the output current of transformer secondary, E2For the output voltage of transformer secondary,
i0For the output current of the first converter, u0For the output voltage of the first converter.The loading system is realized by the first converter
Loading to transformator, its output current of really the first Frequency Converter Control and voltage (i.e. i0And u0) transformator is added
Carry.The current value and power factor value that therefore, it can by controlling the first converter output user to want and loading is constant to realize
Electric current and firm power factor are loaded, and then reduce energy loss.
Fig. 3 is referred to, Fig. 3 is a kind of schematic flow diagram of the loading method of transformator provided in an embodiment of the present invention.Should
The loading method of transformator is applied to the loading system of above-described embodiment, specifically performs the loading method by the first transformator.Such as
Shown in Fig. 3, the loading method includes step S101~S106.
S101, the target current and power-factor angle that obtain needs loading.
In an embodiment of the present invention, in particular the first converter obtains the target current and power factor for needing loading
Angle.The target current and power-factor angle, are configured according to actual needs by user by host computer, the host computer and first
Converter is communicated to connect.Or, per se with interface is arranged, the setting interface for users is arranged to be needed to add first converter
The target current and power-factor angle of load.State for convenience, the target current and power-factor angle are expressed as into i0With
φ.Wherein, power-factor angle is set by the user power factor value through being calculated, the span of power factor value for [-
1,1] power-factor angle is got by, power factor value being carried out into arc cosine computing.
Additionally, the former limit of the transformator is connected by the second converter with alternating current power supply, second converter is used for
Output has the voltage of different amplitudes and frequency to the transformator；It is described to obtain the target current and power factor for needing loading
Angle, including：Obtain the target current of the needs loading that user is arranged according to the voltage with different amplitude and frequency
And power-factor angle.It is possible thereby to pass through to change the second frequency converter output voltage amplitude three-phase alternating current different with frequency replacement
Source, wishes that a loading test system can test different electric pressures with different rated frequencies so as to meet transformator producer
Transformator.
S102, the target current is calculated according to the target current and power-factor angle correspond on Parker's coordinate axess
Current component.
In an embodiment of the present invention, Parker's coordinate refers to park transforms coordinate, specially d, q coordinate, according to reality
Border mapping relations, the corresponding current component of the calculating that the target current according to power-factor angle is mapped on Parker's coordinate axess,
It is expressed as idAnd iq, wherein, id=-i0 cosφ,iq=i0 sinφ。
The sampled value of S103, the output current of the first converter of acquisition, wherein first converter is connected to the change
The secondary of depressor, for loading to the transformator.
In an embodiment of the present invention, the sampled value of the output current of the first converter is obtained, the sampled value is AD samplings
Value.Specifically, the sample circuit collection by arranging in the first converter is obtained.Wherein described first converter is connected to described
The secondary of transformator, for loading to the transformator, replaces existing load to carry out loading transformator.
Additionally, as shown in figure 4, the sampled value of the output current for obtaining the first converter, specifically includes step S103a
~S103c.Wherein, S103a, judge whether the sampling of the output current of first converter is completed；If S103b, having sampled
Into acquisition sampled data simultaneously carries out Parker's coordinate transform to the sampled data；S103c, by after conversion sampled data arrange
For the sampled value of the output current of the first converter of the acquisition.The output current of the first converter is entered by AD sample circuits
Row real-time sampling, judge whether can with Real-time Collection to related data, if related data can be collected and predetermined number is reached,
Then it is judged to that sampling is completed, obtains sampled data and Parker's coordinate transform is carried out to the sampled data, Parker's coordinate transform is
Refer to sampled data of the correspondence on d, q axle, and the adopting as the output current of the first converter using the sampled data on d, q axle
Sample value.
S104, carried out according to the current component and the sampled value PI adjust with generate PI adjust component of voltage.
In an embodiment of the present invention, specifically, by the current component idAnd iqAs the set-point that PI is adjusted, by institute
The value of feedback that AD sampled values are adjusted as PI is stated, current closed-loop PI regulations are carried out, to produce PI component of voltage, corresponding current are adjusted
Component idAnd iq, the PI adjusts component of voltage includes Δ UdWith Δ Uq。
S105, according to the PI adjust component of voltage calculate Parker's coordinate axess on target voltage component and according to described
Target voltage component calculates target voltage.
In an embodiment of the present invention, in order to protect the circuit of the loading system, the first converter to connect by reactor
In the secondary of the transformator.Thus, the target voltage component on component of voltage calculating Parker's coordinate axess is adjusted according to the PI
Including：Component of voltage is adjusted according to the PI and calculates the target voltage component of d axles and the target voltage component of q axles respectively, wherein,
The target voltage component of the d axles is adjusted by the PI on the first transformer secondary voltage, the pressure drop of the reactor and d axles
Component of voltage is produced, the target voltage component of the q axles by the reactor pressure drop and q axles on PI adjust component of voltage and produce
It is raw.
Specifically, the target voltage component of the d axles and the target voltage component of q axles are expressed as ud,uq, wherein,ω is the angular frequency of the secondary voltage of the transformator
Rate, L is the inductance value of the reactor.It should be noted that ω L represent the impedance on reactor,For inducer
Projection of the induction reactance on d shaft voltages,For the projection of the induction reactance on q shaft voltages of inducer.It should be noted that
Angular frequency is that phase-detection and phase are carried out to the secondary voltage of the transformator by the phase-locked loop circuit being arranged in the first frequency conversion
Close and calculate what is obtained.
It is described that target voltage is calculated according to target voltage component, wherein, the target voltage is embodied as u0,The target voltage is with fixed frequency and width
The voltage of value, therefore the amplitude and frequency of vector quantization can specifically be obtained with the vector quantization target voltage.
S106, according to the target voltage to first converter send PWM ripples, for by control it is described first become
Frequency device exports the target voltage and the transformator is loaded.
In an embodiment of the present invention, PWM ripples, specially root are sent to first converter according to the target voltage
According to the target voltage component point udAnd uq, calculate udAnd uqDutycycle, generates specific PWM ripples, through the PWM ripples
First converter exports the target voltage under modulation, and then the transformator is loaded.Therefore said method leads to
The phase angle of the first output current of frequency converter of control is crossed, so the angle of the phase angle and transformer secondary voltage is fixed value,
Therefore the power factor of the transformator loading is also constant, and so as to pass through the first converter constant current and firm power are realized
The loading of factor.
Fig. 5 is referred to, Fig. 5 is a kind of schematic block diagram of the charger of transformator provided in an embodiment of the present invention.Should
Charger is corresponding with the loading method of above-described embodiment, as shown in figure 5, the charger includes：First acquisition module
201st, the first computing module 202, the second acquisition module 203, regulation generation module 204, the second computing module 205 and controlled output
Module 206.
First acquisition module 201, for obtaining the target current and power-factor angle that need loading.Wherein, power factor
Through being calculated, the span of power factor value is [- 1,1] to the power factor value that angle is set by the user, by power factor
Value gets power-factor angle by carrying out arc cosine computing.The former limit of the transformator is by the second converter and alternating current power supply
Connection, second converter is used for output and has the voltage of different amplitudes and frequency to the transformator；Described first obtains
Module, the target electricity specifically for obtaining the needs loading that user is arranged according to the voltage with different amplitudes and frequency
Stream and power-factor angle.
First computing module 202, it is corresponding for calculating the target current according to the target current and power-factor angle
Current component on Parker's coordinate axess.Wherein, the target current according to power-factor angle is mapped on Parker's coordinate axess
Corresponding current component is calculated, current component is expressed as idAnd iq, id=-i0 cosφ,iq=i0 sinφ。
Second acquisition module 203, for obtaining the sampled value of the output current of the first converter, wherein first frequency conversion
Device is connected to the secondary of the transformator, for loading to the transformator.In the output current for obtaining the first converter
Sampled value, in addition it is also necessary to carry out judging whether collection value meets demand, based on this, the second acquisition module 203 includes：Judge submodule
Block 2031, acquisition transformation submodule 2032 and acquisition submodule 2033；Wherein, judging submodule 2031 is used to judge to described the
Whether the output current sampling of one converter completes；Transformation submodule 2032 is obtained, if completing for sampling, sampled data is obtained
And Parker's coordinate transform is carried out to the sampled data；Acquisition submodule 2033, for using the sampled data after conversion as institute
State the sampled value of the output current for obtaining the first converter.
Generation module 204 is adjusted, adjusts to generate PI tune for carrying out PI according to the current component and the sampled value
Section component of voltage.Specifically, by the current component idAnd iqAs the set-point that PI is adjusted, using the AD sampled values as PI
The value of feedback of regulation, carries out current closed-loop PI regulations, and to produce PI component of voltage, corresponding current component i are adjusteddAnd iq, PI tune
Section component of voltage includes Δ UdWith Δ Uq。
Second computing module 205, according to the PI target voltage component on component of voltage calculating Parker's coordinate axess is adjusted
And target voltage is calculated according to the target voltage component.Specifically, the first converter is connected to the change by reactor
The secondary of depressor.Thus, adjusting the target voltage component on component of voltage calculating Parker's coordinate axess according to the PI includes：According to
The PI adjusts component of voltage and calculates the target voltage component of d axles and the target voltage component of q axles respectively, wherein, the d axles
Target voltage component adjusts component of voltage by the PI on the first transformer secondary voltage, the pressure drop of the reactor and d axles
Produce, the target voltage component of the q axles by the reactor pressure drop and q axles on PI adjust component of voltage and produce.
Controlled output module 206, for sending PWM ripples to first converter according to the target voltage, for leading to
Cross and control first converter and export the target voltage to load the transformator.Specifically, according to the target
Voltage to first converter sends PWM ripples, specially according to the target voltage component point udAnd uq, calculate udAnd uqAccount for
Sky ratio, generates specific PWM ripples, and in first converter under the PWM wave modulations target voltage is exported, and enters
And the transformator is loaded.
Those skilled in the art can be understood that, for convenience of description and succinctly, the dress of foregoing description
The specific work process with module is put, the corresponding process in preceding method embodiment is may be referred to, be will not be described here.
Step in present invention method can according to actual needs carry out order adjustment, merge and delete.
Unit in embodiment of the present invention terminal can according to actual needs be merged, divides and deleted.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replaced
Change, these modifications or replacement all should be included within the scope of the present invention.Therefore, protection scope of the present invention should be with right
The protection domain of requirement is defined.
Claims (10)
1. a kind of loading method of transformator, it is characterised in that include：
Obtaining needs the target current and power-factor angle of loading；
The current component on Parker's coordinate axess is corresponded to according to the target current and the power-factor angle calculating target current；
The sampled value of the output current of the first converter is obtained, wherein first converter is connected to the pair of the transformator
Side, for loading to the transformator；
PI is carried out according to the current component and the sampled value to adjust to generate PI regulation component of voltages；
According to the target voltage component on PI regulation component of voltage calculating Parker's coordinate axess and according to the target voltage
Component calculates target voltage；
PWM ripples are sent to first converter according to the target voltage, for by control the first converter output
The target voltage is loaded to the transformator.
2. the loading method of transformator according to claim 1, it is characterised in that the former limit of the transformator passes through second
Converter is connected with alternating current power supply, and second converter is used for output and has the voltage of different amplitudes and frequency to the transformation
Device；
It is described to obtain the target current and power-factor angle for needing loading, including：User is obtained according to described with different width
The voltage of value and frequency and arrange needs loading target current and power-factor angle.
3. the loading method of transformator according to claim 1 and 2, it is characterised in that the converter of the acquisition first
The sampled value of output current, including：
Judge whether the output current sampling of first converter is completed；
If sampling is completed, obtain sampled data and Parker's coordinate transform is carried out to the sampled data；
Sampled data after conversion is set to the sampled value of the output current of the first converter of the acquisition.
4. the loading method of transformator according to claim 3, it is characterised in that first converter is connected to described
The secondary of transformator, including：First converter is connected to the secondary of the transformator by reactor；
The target voltage component adjusted according to the PI on component of voltage calculating Parker's coordinate axess, specifically includes：According to institute
State PI regulation component of voltages and calculate the target voltage component of d axles and the target voltage component of q axles respectively, wherein, the mesh of the d axles
Mark component of voltage adjusts component of voltage and produces by the PI on the first transformer secondary voltage, the pressure drop of the reactor and d axles
It is raw, the target voltage component of the q axles by the reactor pressure drop and q axles on PI adjust component of voltage and produce.
5. the loading method of transformator according to claim 4, it is characterised in that the target current and power-factor angle
It is expressed as i0And φ；It is described that Parker's seat is corresponded to according to the target current and the power-factor angle calculating target current
Current component on parameter is expressed as idAnd iq, specially：id=-i0cosφ,iq=i0sinφ；
The PI adjusts component of voltage and is expressed as Δ Ud,ΔUq；
The target voltage component of the d axles and the target voltage component of q axles are expressed as ud,uq, wherein,ω is the angular frequency of the secondary voltage of the transformator,
L is the inductance value of the reactor；
The target voltage is u0, wherein
6. a kind of charger of transformator, it is characterised in that include：
First acquisition module, for obtaining the target current and power-factor angle that need loading；
First computing module, for calculating the target current according to the target current and power-factor angle Parker's seat is corresponded to
Current component on parameter；
Second acquisition module, for obtaining the sampled value of the output current of the first converter, wherein first converter connection
In the secondary of the transformator, for loading to the transformator；
Generation module is adjusted, adjusts to generate PI regulation voltages point for carrying out PI according to the current component and the sampled value
Amount；
Second computing module, according to the PI adjust component of voltage calculate Parker's coordinate axess on target voltage component and according to
The target voltage component calculates target voltage；
Controlled output module, for sending PWM ripples to first converter according to the target voltage, for by controlling institute
State the first converter output target voltage to load the transformator.
7. the charger of transformator according to claim 6, it is characterised in that the former limit of the transformator passes through second
Converter is connected with alternating current power supply, and second converter is used for output and has the voltage of different amplitudes and frequency to the transformation
Device；
First acquisition module, is arranged specifically for obtaining user according to the voltage with different amplitudes and frequency
Need the target current and power-factor angle of loading.
8. the charger of the transformator according to claim 6 or 7, it is characterised in that second acquisition module includes：
Judging submodule, for judging whether the output current sampling to first converter completes；
Transformation submodule is obtained, if completing for sampling, sampled data is obtained and Parker's coordinate change is carried out to the sampled data
Change；
Acquisition submodule, for using the sampled data after conversion as it is described acquisition the first converter output current sampling
Value.
9. the charger of transformator according to claim 8, it is characterised in that first converter is connected to described
The secondary of transformator, including：First converter is connected to the secondary of the transformator by reactor；
Second computing module, specifically for：The target voltage component that component of voltage calculates respectively d axles is adjusted according to the PI
With the target voltage component of q axles, wherein, the target voltage component of the d axles is by the transformer secondary voltage, the reactor
Pressure drop and d axles on PI adjust component of voltage and produce, the pressure drop and q of the target voltage component of the q axles by the reactor
PI on axle adjusts component of voltage and produces.
10. a kind of loading system of transformator, it is characterised in that including transformator, commutator, reactor, the first converter and
Second converter, wherein the transformator is tested transformator；The secondary of the transformator is by the reactor and described the
The outfan connection of one converter, the input of first converter is connected with the outfan of the commutator；The transformation
The former limit of device is connected by second converter with the outfan of the commutator；The input of the commutator is connected to electricity
Net；First converter includes main control unit, and the main control unit includes：The charger of one of claim 6 to 9.
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| CN110514915A (en) * | 2018-05-22 | 2019-11-29 | 株洲变流技术国家工程研究中心有限公司 | A kind of multi-pulse rectification phase-shifting transformer test method and system |
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| CN103560735A (en) * | 2013-09-27 | 2014-02-05 | 南车株洲电力机车研究所有限公司 | Control method for electro-magnetic synchronous motor |
| CN205229332U (en) * | 2015-11-25 | 2016-05-11 | 株洲中达特科电子科技有限公司 | Transformer load testing system |
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| CN110514915A (en) * | 2018-05-22 | 2019-11-29 | 株洲变流技术国家工程研究中心有限公司 | A kind of multi-pulse rectification phase-shifting transformer test method and system |
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