CN112491153A - Electromagnetic induction type wireless power transmission system and starting current impact suppression method thereof - Google Patents
Electromagnetic induction type wireless power transmission system and starting current impact suppression method thereof Download PDFInfo
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- CN112491153A CN112491153A CN202011224629.6A CN202011224629A CN112491153A CN 112491153 A CN112491153 A CN 112491153A CN 202011224629 A CN202011224629 A CN 202011224629A CN 112491153 A CN112491153 A CN 112491153A
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
An electromagnetic induction type wireless power transmission system and a method for suppressing starting current surge of an inverter at a transmitting side thereof are disclosed, wherein a pre-charging device at a receiving side is used for pre-charging a filter capacitor at a direct current side of an uncontrolled rectifier bridge at the receiving side before the system is started. The method for inhibiting the starting current of the transmitting side inverter avoids the problems of large switching loss, more heat generation and influence on the safety and reliability of the system of the inverter power device caused by the traditional soft starting method, and the starting process does not need active control, thereby simplifying the control of the system.
Description
Technical Field
The invention relates to an electromagnetic induction type wireless power transmission system and a method for inhibiting starting current impact thereof.
Background
If the transmitting side of the electromagnetic induction type wireless power transmission system adopts LCC compensation and the receiving side adopts capacitor series compensation, inverter current impact can occur when the inverter at the transmitting side is started, and particularly when the power of the wireless power transmission system is large, the rated current of the inverter is large and the peak value of the starting current is large. The current capacity of the existing high-power high-frequency switching device is relatively limited, and the current margin and the overload capacity of a high-frequency inverter in a wireless power transmission system are relatively small. In addition, the price of the prior high-power high-frequency switch device is higher, and the loss is larger after overcurrent damage. In order to fully utilize the performance of the high-power high-frequency switching device and enhance the safety and reliability of the system, the starting impact current of the inverter needs to be suppressed so as to prevent the high-frequency switching device from being damaged.
In order to solve the problem of large starting current impact of the wireless power transmission system, a soft start control method can be adopted. For example, the inverter voltage can be reduced by phase shift modulation in the starting stage to reduce the inverter current, or the inverter frequency can be adjusted to deviate from the system resonant frequency in the starting stage to increase the equivalent load impedance of the inverter, so as to reduce the inverter current. The inverter current can also be dynamically controlled by adopting feedback closed-loop control, but a more complex control circuit and a control algorithm are needed.
Disclosure of Invention
The invention provides an electromagnetic induction type wireless power transmission system with a pre-charging mechanism and an LCC compensation mode on a transmitting side and a capacitor series compensation mode on a receiving side, and provides a method for restraining square wave starting current impact of an inverter on the transmitting side aiming at the problem that the electromagnetic induction type wireless power transmission system with the LCC compensation mode on the transmitting side and the capacitor series compensation mode on the receiving side is easy to generate large impact current when the inverter on the transmitting side is directly started by adopting square waves.
In the electromagnetic induction type wireless power transmission system, the inverter INV at the transmitting side is connected with the transmitting coil L through the LCC compensation networkpThe LCC compensation network comprises a transmitting side compensation inductor L1A transmitting side compensation capacitor C1And CpWherein the transmitting side compensates for the capacitance CpSeries transmitting coil LpCompensation capacitor C at transmitting side1Compensation capacitor C connected in parallel to transmitting sidepAnd a transmitting coil LpOn a branch formed by series connection, the AC side and the transmitting side of the inverter INV compensate the inductance L1After being connected in series, the compensating capacitor C is connected with the transmitting side1Parallel connection; the receiving side of the wireless power transmission system adopts capacitor series compensation, and the receiving side compensates a capacitor CsSeries receiving coil LsThen connected to the AC side of the uncontrolled rectifier bridge, and the DC side of the uncontrolled rectifier bridge is connected in parallel with a filter capacitor Cd(ii) a Load R of receiving side of wireless power transmission systemldBy connecting the switch S to the loadldConnected to an uncontrolled rectifier bridge filter capacitor CdTwo ends; the receiving side of the wireless electric energy transmission system is also provided with a direct current power supply DC; DC power supply DC is in series connection with pre-charging switch S in sequencecAnd a current limiting resistor RcThen the voltage is connected in parallel with a filter capacitor C of an uncontrolled rectifier bridgedTwo ends; and the output voltage value of the direct current power supply DC is equal to the output voltage value of the uncontrolled rectifier bridge at the receiving side when the current of the transmitting coil takes the rated value.
The transmitting side of the electromagnetic induction type wireless power transmission system adopts LCC compensation, the receiving side adopts capacitor series compensation, and the load of the receiving side is connected to the filter capacitor at the direct current side of the uncontrolled rectifier bridge through the load connecting switch. The receiving side of the wireless electric energy transmission system is also provided with a direct-current power supply, the output voltage value of the direct-current power supply is equal to the output voltage value of the uncontrolled rectifier bridge of the receiving side when the current of the transmitting coil is rated, and the direct-current power supply is also connected to the filter capacitor of the uncontrolled rectifier bridge direct-current side through a pre-charging switch.
When the electromagnetic induction type wireless power transmission system transmitting side inverter adopts square waves to directly start, the method for restraining the starting current impact of the inverter comprises the following steps:
the method comprises the following steps: setting a compensation capacitance value, a compensation inductance value and a compensation capacitance value of a transmitting side to enable resonance frequencies of the transmitting side and the receiving side to be the same, and enabling current of a transmitting coil to reach a rated value when the inversion voltage of the transmitting side is square waves;
step two: setting the frequency of a transmitting side inverter to be the same as the resonant frequency of a transmitting side and the resonant frequency of a receiving side;
step three: before the electromagnetic induction type wireless power transmission system is started, the pre-charging switch is turned off;
step four: before the electromagnetic induction type wireless power transmission system is started, the load connecting switch is turned off;
step five: closing a pre-charging switch, and disconnecting the pre-charging switch when the non-control rectifier bridge direct-current side filter capacitor completes pre-charging;
step six: the transmitting side inverter outputs square waves at a set frequency, and the system is started in an idle load manner;
step seven: and closing the load connecting switch to connect the load.
The invention has the beneficial effects that:
1) the transmitting side inverter runs by square waves and keeps a soft switching state all the time at a set frequency from starting, a non-soft switching state accompanying a common soft starting process does not exist, the switching loss of an inverter power device in the starting process is small, the device generates less heat, and the safety and the reliability are good.
2) The suppression control of the starting current impact of the transmitting side inverter is simple, the inverter can be operated according to the power-on sequence during starting, a complex starting control algorithm is not needed, and a complex control system hardware circuit is not needed.
Drawings
Fig. 1 is a structural view of an electromagnetic induction type wireless power transmission system to which the present invention is applied;
Detailed Description
The present invention will be further described with reference to the following examples.
The structure of the electromagnetic induction type wireless power transmission system is shown in figure 1: the transmitting side inverter INV of the electromagnetic induction type wireless power transmission system is connected with the transmitting coil L through the LCC compensation networkpThe LCC compensation network comprises a transmitting side compensation inductor L1A transmitting side compensation capacitor C1And CpWherein the transmitting side compensates for the capacitance CpSeries transmitting coil LpCompensation capacitor C at transmitting side1Compensation capacitor C connected in parallel to transmitting sidepAnd a transmitting coil LpOn a branch formed by series connection, the AC side and the transmitting side of the inverter INV compensate the inductance L1After being connected in series, the compensating capacitor C is connected with the transmitting side1And (4) connecting in parallel. The receiving side of the wireless power transmission system adopts capacitor series compensation, and the receiving side compensates a capacitor CsSeries receiving coil LsThen connected to the AC side of the uncontrolled rectifier bridge, and the DC side of the uncontrolled rectifier bridge is connected in parallel with a filter capacitor Cd. Load R of receiving side of wireless power transmission systemldBy connecting the switch S to the loadldConnected to an uncontrolled rectifier bridge filter capacitor CdTwo ends. And the receiving side of the wireless power transmission system is also provided with a direct current power supply DC. DC power supply DC is in series connection with pre-charging switch S in sequencecAnd a current limiting resistor RcThen the voltage is connected in parallel with a filter capacitor C of an uncontrolled rectifier bridgedTwo ends. And the output voltage value of the direct current power supply DC is equal to the output voltage value of the uncontrolled rectifier bridge at the receiving side when the current of the transmitting coil takes the rated value.
When the transmitting side inverter adopts square wave to directly start, the method for restraining the starting current impact of the inverter comprises the following steps:
the method comprises the following steps: according to electromagnetic induction type wireless power transmission system transmitting side coil self-inductance LpAnd self-inductance L of receiving side coilsSetting a compensation capacitor C on the transmitting sidepA transmitting side compensation capacitor C1The transmitting side compensation inductance L1And a receiving side compensation capacitor CsSo that the resonant frequencies of the transmitting side and the receiving side are the same, and so that the transmitting coil current is squared at the inverting voltage of the transmitting side inverter INVReaching a rated value in a wave;
step two: setting the inversion frequency of an inverter INV at the transmitting side to be the same as the resonant frequency of the transmitting side and the resonant frequency of the receiving side;
step three: before the system is started, the pre-charging switch S is turned offcSo that the DC power supply DC, the uncontrolled rectifier bridge and the filter capacitor C thereofdDisconnecting;
step four: before the system is started, the load connection switch S is turned offldSo that a load RldAnd uncontrolled rectifier bridge and filter capacitor C thereofdDisconnecting;
step five: closed pre-charge switch ScThe DC power supply DC passes through a current limiting resistor RcFilter capacitor C of uncontrolled rectifier bridgedPrecharging, as an uncontrolled rectifier bridge filter capacitor CdWhen the voltage of the DC power supply approaches the output voltage value of the DC power supply DC, the pre-charging is completed, and the pre-charging switch S is switched offc；
Step six: the transmitting side inverter INV outputs square waves at a set inversion frequency, and the system is started in an idle load mode;
step seven: closing load connecting switch SldTo load RldAnd the output end of the uncontrolled rectifier bridge is connected.
Claims (2)
1. An electromagnetic induction type wireless power transmission system, characterized in that: the transmitting side inverter INV of the electromagnetic induction type wireless power transmission system is connected with the transmitting coil L through the LCC compensation networkpThe LCC compensation network comprises a transmitting side compensation inductor L1A transmitting side compensation capacitor C1And a transmitting side compensation capacitor CpWherein the transmitting side compensates for the capacitance CpSeries transmitting coil LpCompensation capacitor C at transmitting side1A compensation capacitor C connected in parallel at the transmitting sidepAnd a transmitting coil LpOn a branch formed by series connection, the AC side and the transmitting side of the inverter INV compensate the inductance L1After being connected in series, the compensating capacitor C is connected with the transmitting side1Parallel connection; the receiving side of the wireless power transmission system adopts capacitor series compensation, and the receiving side compensates a capacitor CsSeries receiving coil LsThen connected to the AC side of the uncontrolled rectifier bridgeThe direct current side of the uncontrolled rectifier bridge is connected in parallel with a filter capacitor Cd(ii) a Load R of receiving side of wireless power transmission systemldBy connecting the switch S to the loadldConnected to an uncontrolled rectifier bridge filter capacitor CdTwo ends; the receiving side of the wireless electric energy transmission system is also provided with a direct current power supply DC; DC power supply DC is in series connection with pre-charging switch S in sequencecAnd a current limiting resistor RcThen the voltage is connected in parallel with a filter capacitor C of an uncontrolled rectifier bridgedTwo ends; and the output voltage value of the direct current power supply DC is equal to the output voltage value of the uncontrolled rectifier bridge at the receiving side when the current of the transmitting coil takes the rated value.
2. The method for suppressing start-up current surge in an electromagnetic induction type wireless power transmission system according to claim 1, characterized in that: when the electromagnetic induction type wireless power transmission system transmitting side inverter adopts square wave direct start, the inverter starting current impact suppression method comprises the following steps:
the method comprises the following steps: setting a transmitting side compensation capacitance C1、CpValue of (D), transmitting side compensation inductance L1Value of (C) and a receiving side compensation capacitance CsThe resonant frequency of the transmitting side is the same as that of the receiving side, and the current of the transmitting coil reaches a rated value when the inverted voltage of the transmitting side is square waves;
step two: setting the frequency of a transmitting side inverter to be the same as the resonant frequency of a transmitting side and a receiving side;
step three: before the system is started, the pre-charging switch S is turned offc；
Step four: before the system is started, the load connection switch S is turned offld；
Step five: closed pre-charge switch ScFilter capacitor C of uncontrolled rectifier bridgedPrecharging, when the filter capacitor C on the DC side of the uncontrolled rectifier bridgedWhen the voltage of the DC power supply approaches the output voltage value of the DC power supply DC, the pre-charging is completed, and the pre-charging switch S is switched offc；
Step six: the transmitting side inverter outputs square waves at a set frequency, and the system is started in an idle load manner;
step seven: closing load connecting switch SldTo load RldAnd the output end of the uncontrolled rectifier bridge is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011224629.6A CN112491153A (en) | 2020-11-05 | 2020-11-05 | Electromagnetic induction type wireless power transmission system and starting current impact suppression method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545678A (en) * | 2012-02-16 | 2012-07-04 | 朱建国 | Inverter and startup method thereof |
| CN107425610A (en) * | 2017-05-10 | 2017-12-01 | 北京交通大学长三角研究院 | Radio energy transmission system and control method based on energy resource system load compensation in parallel |
| CN109560587A (en) * | 2018-12-21 | 2019-04-02 | 北京理工大学 | A kind of wireless compensating charge optimization device of bilateral LCC |
| CN110086198A (en) * | 2019-04-23 | 2019-08-02 | 湖北工业大学 | A kind of multiterminal Hybrid HVDC system grid-connected suitable for offshore wind farm and starting control method |
| EP3562016A1 (en) * | 2018-04-23 | 2019-10-30 | FRONIUS INTERNATIONAL GmbH | Precharging of an intermediate circuit |
-
2020
- 2020-11-05 CN CN202011224629.6A patent/CN112491153A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545678A (en) * | 2012-02-16 | 2012-07-04 | 朱建国 | Inverter and startup method thereof |
| CN107425610A (en) * | 2017-05-10 | 2017-12-01 | 北京交通大学长三角研究院 | Radio energy transmission system and control method based on energy resource system load compensation in parallel |
| EP3562016A1 (en) * | 2018-04-23 | 2019-10-30 | FRONIUS INTERNATIONAL GmbH | Precharging of an intermediate circuit |
| CN109560587A (en) * | 2018-12-21 | 2019-04-02 | 北京理工大学 | A kind of wireless compensating charge optimization device of bilateral LCC |
| CN110086198A (en) * | 2019-04-23 | 2019-08-02 | 湖北工业大学 | A kind of multiterminal Hybrid HVDC system grid-connected suitable for offshore wind farm and starting control method |
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