KR20170047482A - Load monitoring method and load estimation system for current control using synchronous coordinate dq modeling of wireless power transmission system - Google Patents
Load monitoring method and load estimation system for current control using synchronous coordinate dq modeling of wireless power transmission system Download PDFInfo
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- KR20170047482A KR20170047482A KR1020150147625A KR20150147625A KR20170047482A KR 20170047482 A KR20170047482 A KR 20170047482A KR 1020150147625 A KR1020150147625 A KR 1020150147625A KR 20150147625 A KR20150147625 A KR 20150147625A KR 20170047482 A KR20170047482 A KR 20170047482A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M7/00—Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway
- B60M7/003—Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway for vehicles using stored power (e.g. charging stations)
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- H02J17/00—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2200/00—Type of vehicle
- B60Y2200/30—Railway vehicles
Abstract
Description
BACKGROUND OF THE
2. Description of the Related Art [0002] Recently, studies on wireless power transmission in the field of railway vehicles have been actively carried out, and various systems have been proposed through Patent No. 10-1535284 and Patent No. 10-2015-0050952.
In such a wireless power transmission system, a transmitter is fixedly installed at a specific position to create a magnetic field for power transmission, and a receiver is installed in a hand-held device or a movable vehicle And transmits power to the load using the voltage / current induced by the magnetic field generated at the power supply side in the stationary state or the moving state.
An example of such a conventional wireless power transmission system is shown in FIG. According to this, the output current of the
At this time, a voltage and current sensor and a
More specifically, the load power (or voltage or current)
At this time, the
However, such a conventional wireless power transmission system requires a load side voltage / current sensor and an additional circuit for wireless communication.
In order to control the high-frequency voltage / current of the wireless power transmission, feedback of the sensor signal within a few milliseconds (ms) faster than the sampling cycle of the DSP is required. On the other hand, Resulting in problems such as controller instability and control bandwidth reduction.
In addition, in the case of the conventional wireless communication system, communications may be interrupted due to disturbance, and in many cases, the system is configured using multiple communication channels for stable system operation, which increases the installation and maintenance cost of the system .
Accordingly, the present invention is directed to solving such problems, and it is an object of the present invention to provide a method and apparatus for controlling power consumption by using a load-side voltage / current sensor and an additional circuit for wireless communication for power transmission using a single-phase resonance type wireless power transmission system, The present invention is to provide a load monitoring method using synchronous coordinate system dq modeling and a load estimation system using the same, in order to prevent communication disconnection due to delay and disturbance and to operate a stable system.
In order to solve such a technical problem,
A method for monitoring a load of a single-phase resonance type wireless power transmission system, comprising: a first step of detecting an original current signal which is a single-phase current of a power supply circuit; A second step of generating an original current signal and a virtual current signal so that the original current signal has a phase difference of 90 degrees; A third step of extracting a current signal of a low frequency component by coordinate conversion of the original current signal and the virtual current signal; And a fourth step of estimating a load on the current collector circuit by using the extracted current signal. The load monitoring method using the synchronous coordinate system dq modeling of the single-phase resonance type wireless power transmission system is provided.
In this case, the first step is a step of sensing a single-phase current of a power supply transmitter.
The second step is a step of generating a virtual current signal which, when the original current signal is inputted, delays the q-axis current in the virtual stationary coordinate system by 90 ° with respect to the original current signal.
The third step is a step of extracting a current signal of a low frequency component by performing coordinate conversion on the original current signal and the virtual current signal using a coordinate conversion formula.
In addition, in the fourth step, after the PID control is performed on the extracted power supply circuit side current signal
In the fourth step, the voltage estimation value on the receiver side is further calculated by performing PID control on the current estimation value on the receiver side.
The method further includes calculating a load resistance estimate by dividing the voltage estimate on the receiver side by the current estimate on the receiver side.
The present invention also provides
A virtual signal generation module that generates a delay current signal having a phase difference of 90 ° using an original current signal sensed by a current sensing unit for sensing a single phase current of a single phase resonance type wireless power transmission system; A synchronous coordinate system conversion module for performing coordinate conversion on the original current signal and the delayed current signal to extract a converted current signal of a low frequency component; A magnitude and phase calculation module for calculating magnitude and phase of the converted current signal extracted from the synchronous coordinate system conversion module; And a current state observer for estimating a current state of a receiver, which is a load, using a magnitude and a phase of the current extracted from the synchronous coordinate system conversion module. The synchronous coordinate system of the single-phase resonance type wireless power transmission system We also provide a load estimation system using dq modeling.
The synchronous coordinate system conversion module converts the original current signal and the delayed current signal outputted through the virtual signal generation module to coordinate conversion, and extracts a converted current signal of a low frequency component.
Then, the current state observer performs PID control on the power supply circuit side current signal extracted from the synchronous coordinate system conversion module
The current estimation value of the current state observer is further subjected to PID control to calculate a voltage estimation value on the receiver side and divided by the current estimation value on the receiver side to calculate a load resistance And a load resistance observer for further calculating an estimated value.
According to the present invention, when designing a single-phase resonance type wireless power transmission system applied to a railway vehicle or the like, coordinate conversion from a single-phase current to a synchronous coordinate system component is performed through a DQ synchronous coordinate system model, phase delay can be eliminated and the load current of the current collecting circuit can be tracked in real time, so that the control safety of the wireless power transmission can be improved.
In addition, according to the present invention, it is possible to estimate the current on the current collector side using the state observer by using the current measured on the power supply circuit side, and there is no need for wireless communication between the power collecting devices, There is no problem such as communication disconnection and delay occurring in wireless communication, so that power transmission can be stably performed.
FIG. 1 is a configuration diagram of a load power control using a sensor and wireless feedback in a conventional wireless power transmission system.
2 is a circuit diagram of a single-phase serial-to-serial resonant type wireless power transmission system shown to explain the present invention.
3 is an equivalent circuit of the single-phase series-series resonant wireless power transmission system of Fig.
Fig. 4 is an equivalent circuit shown in the time domain of the single-phase serial-to-serial resonant wireless power transmission system of Fig.
5 is a virtual circuit diagram showing a phase difference of 90 DEG from the system of FIG.
Fig. 6 is a circuit diagram of a wireless power transmission system in which the circuits of Figs. 4 and 5 are shown on a complex plane.
Fig. 7 is a circuit diagram of a wireless power transmission system in which the circuit of Fig. 6 is shown on a rectangular coordinate system.
8 is an equivalent circuit of a wireless power transmission system in which the circuit of Fig. 7 is shown in a complex plane synchronous coordinate system.
FIG. 9 is a synchronous coordinate system d-axis equivalent circuit of the wireless power transmission system of FIG.
10 is a synchronous coordinate system q-axis equivalent circuit of the wireless power transmission system of FIG.
11 is a diagram showing voltage and current phase diagrams of a fully tuned power supply and current collector.
FIG. 12 is a diagram showing the voltage and current signals seen from the time axis and the generated signal waveforms. FIG.
Fig. 13 is a diagram showing voltage and current phase diagrams on a power supply circuit and a collector circuit side in a typical system.
FIG. 14 is a feedback configuration diagram using a dq conversion of a single-phase wireless power transmission system.
15 is a diagram showing an example of a current state observer design using synchronous coordinate conversion and a low-frequency model.
FIG. 16 is a view showing a current state observer using the low-frequency model and the synchronous coordinate conversion according to the present invention modified from FIG. 15. FIG.
17 is a detailed block diagram of a current control device using synchronous coordinate conversion and a low frequency model according to the present invention.
18 is a view illustrating a load resistance observer using a synchronous coordinate transformation and a low-frequency model according to another embodiment of the present invention.
19 is a diagram illustrating an AC model of a wireless power transmission system.
20 is a diagram showing a DQ model of a wireless power transmission system.
21 is a diagram showing a simulation model of the wireless power transmission DQ model.
22 is a diagram showing the voltage applied to the AC wireless power transmission system and the coil current waveform of the power supply circuit.
23 is a graph of a voltage applied to the DQ model and a current of a current collector coil.
24 is a diagram illustrating a DQ current state observer model of a wireless power transmission system.
25 (a) to 25 (d) are detailed diagrams of current collector and load state estimator blocks of the current collector circuit.
26 (a) to (c) are graphs showing simulation results of current and load resistance estimation using the state observer according to the present invention.
Hereinafter, the load monitoring method and the load estimation system using the synchronous coordinate system dq modeling of the single-phase resonance type wireless power transmission system according to the present invention will be described in detail with reference to the accompanying drawings.
Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.
Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.
A single-phase resonance type wireless power transmission system employing synchronous coordinate system dq modeling and a state monitoring apparatus using the synchronous coordinate system dq modeling system according to the present invention is a system for wireless power supply of a railway vehicle, By applying the coordinate system model, the actual single-phase current is converted into the synchronous coordinate system component, and the current is controlled by feeding back the signal without phase delay.
In the present invention, a single-phase resonance type wireless power transmission system is modeled by using synchronous coordinate system dq modeling technique, which is mainly used in three-phase electric devices, and a method of constructing a collector voltage / current / load observing device through such modeling , And a method of constructing a controller using a load observer is proposed.
The dq modeling of the present invention is widely applicable not only to a single-phase serial-to-serial resonant-type wireless power transmission system but also to circuits connected in series or in parallel or in series-parallel combination of feed and current inductors and capacitors. The degree of design change belongs to the technical category of the present invention.
Hereinafter, a synchronous coordinate system DQ modeling technique, a DQ conversion method of a measured signal, an observer configuring method, and a controller designing method will be described in the present invention using a single-phase serial-to-serial resonant wireless power transmission system as an example.
First, the process of modeling the wireless power transmission system into the dq synchronous coordinate system will be described.
FIG. 2 is a circuit diagram of a single-phase serial-to-parallel resonance type wireless power transmission system. According to the circuit of FIG. 2, the feed coil L tx of the feed circuit and the compensation capacitor (compensating for leakage inductance of the feed coil L tx ) C tx ) are connected in series and the voltage and current are induced in the current-collecting coil (L rx ) of the current-collecting circuit by electromagnetic induction due to the magnetic field generated in the power-feeding coil (L tx ).
In addition, the current collector has a power supply coil like coil (L tx) current collecting coil (L rx) in order to compensate the leakage inductance (leakage inductance) of (rx L) capacitor (C rx) are connected in series.
At this time, the capacitors C tx , C rx may be connected in parallel with the power supply coil L tx and the current-collecting coil L rx .
The power supply coil L tx and the current collecting coil L rx and the capacitors C tx , C rx) the voltage (V Ltx, Lrx V) applied to each of the power supply coil (L tx) and a current collecting coil (L rx) in the series-connected circuit is equal to the expression below.
Thus, the circuit of FIG. 2 may be represented as an equivalent circuit having two dependent sources as shown in FIG.
At this time, a look at V s = V s cos (ωt ), i tx = I tx cos (ωt-φ 1), i rx = I rx cos (ωt-φ 2) in the time domain (Time domain), wherein φ 1 Is the phase of the power supply side current against the input voltage, and? 2 is the phase of the current on the power supply side with respect to the input voltage. This is shown in the circuit of FIG. 3 as shown in FIG.
Since the wireless power transmission system is a single-phase system, the system of FIG. 5 is designed to have a 90-degree phase difference as shown in FIG. 5 so that the voltage and current are 90 degrees out of phase with the original system, A virtual circuit can be created.
5, the current and voltage values of the inductor and the capacitor are 90 degrees out of phase with the original circuit.
The two circuits shown in FIGS. 4 and 5 are shown on the complex plane as shown in FIG. 6, and they can be expressed as a component of the dq orthogonal coordinate system as shown in FIG.
7, I d tx and I q tx are low frequency components of the current on the d and q axes of the feed circuit, I d rx and I q rx are the currents on the d and q axes of the current collector, (low frequency) component. The voltage across the inductor of the power supply circuit is given by the following equation. At this time, the superscript s indicates that it is an expression represented by the still coordinate system.
In the synchronous coordinate system in which the inductor voltage rotates at the speed of ?, The inductor voltage (V Ltx e ) remains as a low frequency component as shown in the following equation. At this time, the superscript e indicates that it is an expression represented by the synchronous coordinate system.
In other words, the inductor in the stationary coordinate system is represented by the inductor having the inductance of L tx and the dependent source having the electromotive force of jωL tx in the synchronous coordinate system. This is also applied to the current collecting circuit so that the current inductor voltage (V Lrx e ) can be expressed by the following equation.
Then, the capacitor voltages (V Ctx s , V Ctx e ) in the stationary coordinate system and the synchronous coordinate system can be obtained by partial integral method as shown in the following equations.
That is, the feed-side capacitor voltage seen from the synchronous coordinate system
Therefore, the circuit of Fig. 7 can be represented by the synchronous coordinate system equivalent circuit model as shown in Fig. The circuit of FIG. 8 may be represented by an equivalent circuit model of the synchronous coordinate system d-axis wireless power transmission system of FIG. 9 and an equivalent circuit model of the synchronous coordinate system q-axis wireless power transmission system of FIG.
Using the synchronous coordinate system, the voltage and current on the equivalent circuit are all low frequency components, which is very helpful for the design of the controller and the state observer.
Such a dq equivalent circuit not only can understand the characteristics of the resonant wireless power transmission system but also can be used in a controller using a low frequency voltage and current component.
Hereinafter, characteristics of the wireless power transmission system according to the present invention using the dq synchronous coordinate system model will be described.
First, in the dq synchronous coordinate system model proposed in the present invention, the currents in the d-axis circuit are determined by the q-axis current components, the currents in the q-axis circuit are determined by the d-axis current components, Is influenced by the input voltage Vs and the currents of the q-axis feeding circuit and the receiver, and is not affected by the d-axis current collector current.
The input of the feed power is transmitted through the d axis of the feeder and the output is transmitted through the q axis of the receiver. In the above equivalent circuit, if the resonant frequencies of the transmitter and the receiver are exactly the same and the system is operated at that resonance frequency, then the back-EMF term of wL-1 / (wC) I in each equivalent circuit ) Becomes "0" and no voltage is applied to the q-axis feeder transmitter, "I q tx = 0". Since the current of the q-axis feeding circuit is '0', the current of the d-axis current collecting circuit also becomes '0'. The power generated by the d-axis power supply transmitter is transmitted to the q-axis power receiver.
Therefore, in terms of transmission of electric power, the d-axis of the power supply circuit is the main axis and the q-axis of the receiver is the main axis.
This can be confirmed in the phasor diagram of the voltage and current in FIG. The input voltage V s and the input current I tx are in the same phase on the d axis as shown in FIG. 11, if the power supply side tuning is ideally made and "ωLtx-1 / ωCtx = 0" .
Therefore, the input power is all determined by the product of the voltage and the current in the d-axis. At this time, the voltage jωMI tx induced on the collector side has a phase difference of 90 ° with I tx and is located on the q-axis as shown in the figure.
If, when the power supply circuit (transmitter) measure tuning at the operating frequency is made up of the value of the ideal ωL -1 rx / rx ωC is '0' I rx as shown is positioned on the q-axis in the same manner as tx jωMI.
Thus, the output power is determined by the voltage and current on the q-axis of the collector. In this case, the power factor of the input voltage and the input current is '1' and the power factor of the output power supply side is also '1'.
On the other hand, if the tuning is not perfect, I tx may be in the form of lagging for the ZVS of the switch by φ tx when the input voltage is located on the d axis as shown in FIG. jωMI tx is an additional lagging vector with this I tx and 90 °, and I rx can lead or lagging over jωMI tx depending on the tuning of the inductor and capacitor.
In this case, when the dq model is used, the ratio of I d tx and I q tx and the atan (inverse tangent) function are advantageous in that the phases of the transmitter and collector currents can be immediately known.
That is, even if the current phase detection circuit is not separately configured, the phases of the power supply circuit and the receiver current can be obtained without delay only by such coordinate conversion. Since V s and I d tx are in phase, they contribute to the input real power and I q tx on the transmitter side generates a phase difference of 90 ° with V s , It is important to contribute only to the power (imaginary power) and loss. Since the d-axis current I d rx and the voltage ωMI q tx have the same phase and the q-axis current I q rx and the voltage ω M d tx are in the same phase, the d-axis current and the q-axis current Contributes to the output effective power.
Hereinafter, the synchronous coordinate system conversion method of the measured current signal will be described.
For a typical three-phase system, Park's transformation is used to convert the synchronous coordinate system of the 3-phase (I a sin (ωt), I b sin (ωt-2π / 3), I c sin Axis signal having a phase difference of 90 degrees, and then the synchronous coordinate system conversion is performed by multiplying the electric angular velocity by the following matrix equation, which is a synchronous coordinate system conversion.
In this case, in the case of a general three-phase system, the d-axis of the synchronous coordinate system may be located at the same position as the a-phase and the q-axis may be phase-shifted by 90 ° using the above matrix formula.
However, the single-phase wireless power transmission system, unlike the conventional three-phase system, senses an original current signal and a virtual current signal having a phase difference of 90 degrees with the original current signal as shown in FIGS. 4 and 5 Synchronous coordinate system transformation can be used.
That is, as shown in FIG. 14, when the original current signal sensed by the
As described above, in the synchronous coordinate system conversion of the three-phase system, it is assumed that a sin (ωt) type current flows on a, and when the coordinate conversion is performed, the d-axis of the synchronous coordinate system coincides with the a-phase.
In the case of the wireless power transmission system according to the present invention, in order to obtain the d-axis and q-axis equivalent circuit model, it is assumed that the voltage and current have a function of cos (ωt) And the d-axis and q-axis coordinate systems are located. The input original current signal generates a virtual current signal that delays the q-axis current in the virtual stationary coordinate system by 90 [deg.] Relative to the original current signal through the
Using these coordinate transformations, we can have four low frequency component values of I d tx , I q tx , I d rx , and I q rx in the synchronous coordinate system, leaving only the envelope of the current. In the steady state, it has a dc value.
Therefore, this dq modeling and conversion technique is very helpful for controller design and bandwidth selection.
Hereinafter, a description will be given of a design example of a rapid current collector state observer using a synchronous coordinate system model in a single-phase resonance type wireless power transmission system according to the present invention.
Using the DQ model of FIGS. 9 and 10, the D-axis and Q-axis current state observers on the power feeder side can be designed as shown in FIG. In this case, ^ denotes the estimated value known to the controller, V s * denotes the current controller output voltage command of the resonant inverter, and I d tx and I q tx indicate the D axis and Q axis currents of the power supply circuit Measured value,
Accordingly, the present invention proposes a method of estimating the D axis and Q axis currents I d rx and I q rx on the collector side by modifying the state observer proposed in Fig. That is, if the feedforward terms excluding the feedback controller output are correct in the state observer of FIG. 15, the output of the PID controller becomes '0'. However, if there are no terms associated with the D-axis and Q-axis currents I d rx , I q rx on the collector side, as described above, the output of the PID controller
Therefore, the PID controller output
17, the
At this time, the original current signal, which is the sensed single-phase current of the power feeding circuit through the
The magnitude and the phase of the current extracted from the synchronous coordinate
On the other hand, if you want to know the value of the equivalent resistor on the receiver side, it is simple but there is an error.
That is, the current collector side voltage estimation value is calculated by dividing the d-axis power on the power supply circuit side by the absolute value of the current estimation value on the current collector circuit side, and the absolute value of the calculated voltage estimation value is divided by the absolute value of the current- Side equivalent resistance is obtained. Such a method can observe the load resistance simply, but there is an error because the efficiency of the wireless power supply system is not 100%, and the efficiency becomes worse when the output power is low.
The second method can be obtained in the form of a state observer as shown in FIG. 18 using the receiver side DQ model. According to the load resistance observer of Fig. 18, when the current estimation value on the current collector side is input to the PID controller, the current collector side voltage estimation value is calculated through the calculation process, and the calculated axis voltage estimation value is input to the PID controller, The load resistance estimation value can be calculated.
Hereinafter, an embodiment of the present invention will be described.
In one embodiment of the present invention, the coil inductance of the feeder and receiver is 30 μH and the load is the dq model of the circuit as shown in FIGS. 19 to 21 with Series-Series tuning at 3 Ω, 60 kHz, And the design of the current observer and the load resistance observer can be considered.
When the DQ model, the DQ conversion, and the current observer and the load resistance observer design using the Matlab simulink are simulated, the high frequency resonant circuit of FIG. 3 is represented by the model shown in FIGS.
At this time, when a square wave type voltage of about 600 V is applied to the AC model of the wireless power transmission system shown in FIG. 19, a sine type current of about 400 A peak flows in the power feeding circuit as shown in FIG.
23, when the voltage applied to the DQ model is equal to the voltage applied to the AC model, it can be seen that the current flowing in the feeder circuit moves well with the peak value of the current flowing in the AC model.
At this time, in the graph of FIG. 23, yellow and pink are the voltage and current of the AC model, and blue and red are the voltage and current of the DQ model. It can be seen that the current (red) of the DQ model tracks the pink AC model current peak well without delay.
FIG. 23 is a graph showing a voltage applied to the DQ model and a current chart of a current collecting coil on the side of the transmitter. FIG. 24 is a diagram showing a DQ current state observer model on the collector side of the wireless power transmission system. to be.
25A to 25D are detailed block diagrams of a current and a load state estimator block on the side of a current collector,
26A to 26C are graphs showing results of current and load resistance estimation simulation using the state observer according to the present invention. The current state estimator and the current state estimator of FIG. And a current value and a load value of the current receiver side estimated using the load resistance estimator are compared with actual values. The simulation condition assumes that the value of the equivalent resistance changes to 6 Ω in 2 ms with a load having an equivalent resistance of 3 Ω at the beginning of the simulation. As can be seen in FIG. 26, the d and q axis estimated currents on the collector side follow the actual current with almost no error, and the value of the load resistance follows the actual value in about 100 μs at the beginning of the simulation And when it changes from 3Ω to 6Ω, it is confirmed that it follows about 40 μs.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The scope of protection of the present invention should be construed under the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.
100: load estimation system 101: current sensing unit
110: virtual signal generation module 120: synchronous coordinate system conversion module
130: current state observer 140: current controller
200: receiving side circuit 201: load
Claims (11)
A first step of detecting an original current signal which is a single-phase current of the power supply circuit;
A second step of generating an original current signal and a virtual current signal so that the original current signal has a phase difference of 90 degrees;
A third step of extracting a current signal of a low frequency component by coordinate conversion of the original current signal and the virtual current signal;
And a fourth step of estimating a load on the current collector circuit using the extracted current signal.
Wherein the first step is a step of sensing a single-phase current of a power supply transmitter.
Wherein the second step is a step of generating a virtual current signal which, when the original current signal is input, delays the q-axis current in the virtual stationary coordinate system by 90 [deg.] Relative to the original current signal. Load monitoring method using synchronous coordinate system dq modeling.
Wherein the third step is a step of extracting a current signal of a low frequency component by performing coordinate conversion on the original current signal and the virtual current signal using a coordinate conversion formula, Load Monitoring Method Using Coordinate System dq Modeling.
The fourth step is a step of performing PID control on the extracted power supply circuit side current signal
And the fourth step is a step of further performing PID control on the current estimation value on the receiver side to calculate a voltage estimation value on the receiver side. In the single-phase resonance type wireless power transmission system, Load monitoring method using dq modeling.
And calculating a load resistance estimate value by dividing the voltage estimation value on the receiver side by the current estimation value on the receiver side, and further calculating a load resistance estimation value using the synchronous coordinate system dq modeling of the single-phase resonance type wireless power transmission system. Load monitoring method.
A synchronous coordinate system conversion module for performing coordinate conversion on the original current signal and the delayed current signal to extract a converted current signal of a low frequency component;
A magnitude and phase calculation module for calculating magnitude and phase of the converted current signal extracted from the synchronous coordinate system conversion module;
And a current state observer for estimating a current state of a receiver, which is a load, using a magnitude and a phase of the current extracted from the synchronous coordinate system conversion module. The synchronous coordinate system of the single-phase resonance type wireless power transmission system Load estimation system using dq modeling.
Wherein the synchronous coordinate system conversion module extracts a converted current signal of a low frequency component by performing coordinate conversion on an original current signal and a delayed current signal output through the virtual signal generating module, Load Estimation System Using Synchronous Coordinate System dq Modeling.
The current state observer performs PID control on the current signal on the power supply circuit side extracted from the synchronous coordinate system conversion module
A current estimation value on the receiver side of the current state observer is subjected to PID control to further calculate a voltage estimation value on the receiver side and divided by a current estimation value on the collector side to calculate a load resistance estimation value And further comprising a load resistance observer for calculating the load resistance of the single-phase resonance type wireless power transmission system.
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| US10749382B2 (en) | 2017-06-16 | 2020-08-18 | Samsung Electronics Co., Ltd. | Wireless power transmitter and method for operating the same based on external voltage and current |
| WO2023205514A1 (en) * | 2022-04-22 | 2023-10-26 | Borgwarner Inc. | Rotor current prediction in an electric motor drive having an only-stationary-side compensation network |
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| US8669677B2 (en) | 2010-12-28 | 2014-03-11 | Tdk Corporation | Wireless power feeder, wireless power receiver, and wireless power transmission system |
| JP2014024365A (en) * | 2012-07-24 | 2014-02-06 | Railway Technical Research Institute | Non-contact power supply system |
| KR101535284B1 (en) | 2013-11-01 | 2015-07-09 | 한국철도기술연구원 | System for transmitting wireless power |
| CN104702113B (en) * | 2015-02-16 | 2017-03-01 | 湘潭大学 | Device and method is realized based on the wireless power transmission systems ZVS Sofe Switch of frequency-tracking |
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| US10749382B2 (en) | 2017-06-16 | 2020-08-18 | Samsung Electronics Co., Ltd. | Wireless power transmitter and method for operating the same based on external voltage and current |
| WO2023205514A1 (en) * | 2022-04-22 | 2023-10-26 | Borgwarner Inc. | Rotor current prediction in an electric motor drive having an only-stationary-side compensation network |
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