CN106877522B - A control method of a series compensation dual active wireless power transmission system - Google Patents

A control method of a series compensation dual active wireless power transmission system Download PDF

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CN106877522B
CN106877522B CN201710188425.3A CN201710188425A CN106877522B CN 106877522 B CN106877522 B CN 106877522B CN 201710188425 A CN201710188425 A CN 201710188425A CN 106877522 B CN106877522 B CN 106877522B
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bridge converter
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phase
controller
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CN106877522A (en
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雷万钧
刘奉华
段国朝
崔耀
郑沛坤
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Yueqing Yandangshan Electrical Research Institute
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Xian Jiaotong University
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    • H02J7/025—
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a kind of control methods of the double active radio electric energy Transmission systems of series compensation, including secondary sampler circuit acquisition exchange side to export electric current i2Phase；Secondary controller will collect exchange side output electric current i2Phase zero crossing as time reference, the working method combined is controlled with PWM using PLL control, calculates secondary side full-bridge converter driving signal timing, the output voltage control of realization Sofe Switch condition；Primary controller is to collect exchange side input current i1Phase zero crossing as time reference, the working method combined, the duty ratio D of adjustment primary side full-bridge converter are controlled with PWM using PLL control1, when so that primary side switch pipe being opened, exchange side input current i1Phase zero passage, realize primary side full-bridge converter switching device Sofe Switch.

Description

一种串联补偿双有源无线电能传输系统的控制方法A control method of a series compensation dual active wireless power transmission system

技术领域：Technical field:

本发明属于无线电能传输技术领域，具体涉及一种串联补偿双有源无线电能传输系统的控制方法。The invention belongs to the technical field of wireless power transmission, and in particular relates to a control method for a series compensation dual active wireless power transmission system.

背景技术：Background technique:

现有的串联补偿双有源无线电能传输系统由原边全桥变换器、发射侧线圈及其补偿电容，副边全桥变换器、接受侧线圈及其补偿电容构成，其拓扑结构如图1所示。串联补偿双有源无线电能传输系统，由于双边具有有源特性，可以主动调整接受侧输出电压，适应大负载变化范围应用场合，效率高。由于具有完全对称的特性，因此能够实现能量的双向传递。The existing series-compensated dual active wireless power transfer system consists of a primary full-bridge converter, a transmitter coil and its compensation capacitor, a secondary full-bridge converter, a receiver coil and its compensation capacitor, and its topology is shown in Figure 1. shown. The dual active wireless power transmission system with series compensation can actively adjust the output voltage of the receiving side due to the active characteristics of both sides, which is suitable for applications with large load variation range and high efficiency. Due to its completely symmetrical characteristics, it is possible to realize two-way transmission of energy.

串联补偿双有源无线电能传输系统控制方法方面，目前最简单的是纯移相调制策略。该控制方法只有一个控制量，两侧全桥变换器工作在50％固定占空比状态，通过控制两个全桥变换器的移相角改变移相角的大小和正负，可以控制传输功率的大小和方向。这个控制方法实现简单，但是由于两个全桥变换器工作在固定占空比，移相角的引入引起大量的无功电流，因此损耗巨大，系统效率低。In terms of the control method of the series compensation dual active wireless power transmission system, the simplest one is the pure phase shift modulation strategy. This control method has only one control quantity, the full-bridge converters on both sides work in a 50% fixed duty cycle state, by controlling the phase shift angle of the two full-bridge converters Changing the size and positive or negative of the phase shift angle can control the size and direction of the transmission power. This control method is simple to implement, but since the two full-bridge converters work at a fixed duty cycle, the phase shift angle The introduction of the lead causes a large amount of reactive current, so the loss is huge and the system efficiency is low.

串联补偿双有源无线电能传输系统的另一种控制方法是双PWM控制方式。即两个全桥变换器都采用PWM控制，控制两个变换器的输出电压，为了优化效率维持两个全桥变换器移相角为90度固定值。这种控制方法由于没有无功电流的引入，系统效率高。但是由于两个全桥变换器都采用PWM控制，全桥变换器都是工作在硬开关状态，开关损耗大；PWM控制中占空比的调整需要通信系统的引入，增加系统成本。Another control method of the series compensation dual active wireless power transfer system is the dual PWM control method. That is, both full-bridge converters use PWM control to control the output voltage of the two converters, and to maintain the phase shift angle of the two full-bridge converters in order to optimize efficiency It is a fixed value of 90 degrees. Since this control method does not introduce reactive current, the system efficiency is high. However, since the two full-bridge converters both adopt PWM control, the full-bridge converters are all working in a hard switching state, and the switching loss is large; the adjustment of the duty cycle in the PWM control requires the introduction of a communication system, which increases the system cost.

发明内容：Invention content:

本发明的目的在于克服上述现有技术存在的缺陷，提供了一种串联补偿双有源无线电能传输系统的控制方法，该控制方法原边副边两个全桥变换器都采用固定频率下的PLL控制与PWM控制相结合的控制方法，无需通信装置条件下，实现输出电压的稳定，能量的双向传输，使得两个全桥变换器都工作在软开关状态下，提高系统效率。The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and to provide a control method for a series compensation dual active wireless power transmission system. The control method combining PLL control and PWM control realizes the stability of the output voltage and the bidirectional transmission of energy without the need of a communication device, so that both full-bridge converters work in a soft switching state and improve system efficiency.

为达到上述目的，本发明是通过以下技术方案来实现的：To achieve the above object, the present invention is achieved through the following technical solutions:

一种串联补偿双有源无线电能传输系统的控制方法，包括以下步骤：A control method for a series compensation dual active wireless power transmission system, comprising the following steps:

1)副边采样电路分别采集直流侧输出电压Vo的幅值，以及交流侧输出电流i2的相位送入副边控制器；1) The secondary-side sampling circuit collects the amplitude of the output voltage V o on the DC side and the phase of the output current i2 on the AC side and sends them to the secondary-side controller;

2)将步骤1)中采集到的直流侧输出电压Vo与直流侧输出参考值Voref做差比较，其差值经过PI调节器整定，得到副边全桥变换器占空比D2；2) Compare the difference between the DC side output voltage V o collected in step 1) and the DC side output reference value Voref, and the difference is adjusted by the PI regulator to obtain the duty ratio D2 of the secondary side full-bridge converter;

3)将步骤2)得到的副边全桥变换器占空比D2经过交流侧输出电流i2的相位过零点作为时间基准，副边控制器采用PLL控制与PWM控制相结合的工作方式，副边控制器计算出副边全桥变换器驱动信号时序，经驱动电路，驱动相应副边全桥变换器开关器件；3) The duty ratio D2 of the secondary full-bridge converter obtained in step 2 ) passes through the zero-crossing point of the phase of the output current i2 of the AC side as a time reference, and the secondary controller adopts the working mode of combining PLL control and PWM control, The secondary side controller calculates the timing sequence of the driving signal of the secondary side full bridge converter, and drives the corresponding secondary side full bridge converter switching device through the driving circuit;

4)原边采样电路分别采集直流侧输入电压Vin的幅值，以及交流侧输入电流i1的相位送入原边控制器；4) The primary-side sampling circuit collects the amplitude of the input voltage Vin on the DC side and the phase of the input current i1 on the AC side and sends them to the primary-side controller;

5)将步骤4)中采集到交流侧输入电流i1的相位过零点作为时间基准，原边控制器调整原边全桥变换器的占空比D1，输出原边全桥变换器驱动信号时序，经驱动电路，驱动相应原边全桥变换器开关器件，原边控制器采用PLL控制与PWM控制相结合的工作方式，使得原边开关管开通时，交流侧输入电流i1的相位过零。5) Taking the phase zero-crossing point of the AC side input current i 1 collected in step 4) as the time reference, the primary-side controller adjusts the duty ratio D 1 of the primary-side full-bridge converter, and outputs the driving signal of the primary-side full-bridge converter Sequence, through the drive circuit, drives the corresponding primary side full bridge converter switching device, the primary side controller adopts the working mode of PLL control and PWM control, so that when the primary side switch tube is turned on, the phase of the AC side input current i 1 is over zero.

本发明进一步的改进在于，步骤3)中，以交流侧输出电流i2在相位过零作为计时起点，副边控制器控制副边全桥变换器的相位延迟，在相位延迟时间段，使得i2被短路，从而实现副边全桥变换器占空比D2的调整，控制直流侧输出电压Vo稳定。A further improvement of the present invention is that, in step 3), the phase zero crossing of the AC side output current i2 is used as the timing starting point, the secondary side controller controls the phase delay of the secondary side full-bridge converter, and in the phase delay time period, i 2 is short-circuited, so as to realize the adjustment of the duty ratio D 2 of the secondary full-bridge converter, and control the output voltage V o of the DC side to be stable.

本发明进一步的改进在于，步骤3)中，交流侧输出电流i2在相位延迟时间结束后，副边控制器控制副边全桥变换器开关管关断，交流侧输出电流i2通过副边全桥变换器二极管续流，交流侧输出电流i2过零时自然关断，实现副边全桥变换器的ZCS软开关。The further improvement of the present invention is that in step 3), after the phase delay time of the AC side output current i2 ends, the secondary side controller controls the switching tube of the secondary side full-bridge converter to turn off, and the AC side output current i2 passes through the secondary side The diode of the full-bridge converter continues to flow, and the output current i 2 on the AC side is naturally turned off when it crosses zero, realizing the ZCS soft switching of the full-bridge converter on the secondary side.

本发明进一步的改进在于，步骤5)中，通过采样检测到交流侧输入电流i1的相位，原边控制器不断调整原边全桥变换器的占空比D1，实现原边全桥变换器开关管开通时交流侧输入电流i1恰好过零，原边控制器计算出原边全桥变换器驱动信号时序，经驱动电路，驱动相应原边全桥变换器开关器件，实现原边全桥变换器开关管的ZVS软开关。The further improvement of the present invention is that in step 5), the phase of the input current i 1 on the AC side is detected by sampling, and the primary side controller continuously adjusts the duty ratio D 1 of the primary side full-bridge converter to realize the primary side full-bridge conversion When the switching tube of the switch is turned on, the input current i 1 of the AC side just crosses zero, and the primary side controller calculates the timing sequence of the driving signal of the primary side full bridge converter, and drives the corresponding switching device of the primary side full bridge converter through the driving circuit to realize the full ZVS soft switching of switch tube in bridge converter.

与现有技术相比，本发明具有以下有益的技术效果：Compared with the prior art, the present invention has the following beneficial technical effects:

本发明进一步的改进在于，采用固定频率下的PLL控制与PWM控制相结合的控制方法，输出电压的稳定的同时，实现了两侧全桥变换器工作在软开关状态下，提高系统效率。The further improvement of the present invention lies in that a control method combining PLL control and PWM control at a fixed frequency is adopted to stabilize the output voltage while realizing the full-bridge converters on both sides working in a soft switching state and improving system efficiency.

进一步地，本发明通过采样谐振电流实现控制，控制系统无需通信装置，节约了成本，增加了系统的可靠性。Furthermore, the present invention implements control by sampling the resonant current, and the control system does not need a communication device, which saves costs and increases system reliability.

进一步地，本发明由于副边整流器采用有源全桥变换器，原边副边的控制结构完全相同，能够实现能量的双向传递。Furthermore, in the present invention, since the secondary side rectifier adopts an active full-bridge converter, the control structures of the primary side and the secondary side are completely the same, and bidirectional transmission of energy can be realized.

进一步地，原边控制器和副边控制器都采用PLL控制与PWM控制相结合的工作方式，两侧变换器单独定频控制，通过电流相位检测，实现输出电压稳定，两边同时实现软开关Furthermore, both the primary-side controller and the secondary-side controller adopt the working mode of combining PLL control and PWM control. The converters on both sides are controlled independently at fixed frequency, and the output voltage is stabilized through current phase detection, and soft switching is realized on both sides at the same time.

附图说明：Description of drawings:

图1为串联补偿双有源无线电能传输系统；Figure 1 is a series compensation dual active wireless power transfer system;

图2为串联补偿双有源无线电能传输系统的控制方法结构框图；Fig. 2 is a structural block diagram of a control method of a series compensation dual active wireless power transmission system;

图3为串联补偿双有源无线电能传输系统的运行波形图。Fig. 3 is an operation waveform diagram of the series compensation dual active wireless power transfer system.

具体实施方式：Detailed ways:

下面结合附图对本发明做进一步的详细说明，所述是对本发明的解释而不是限定。以下结合附图对本发明做出进一步的说明。The present invention will be further described in detail below in conjunction with the accompanying drawings, which are explanations rather than limitations of the present invention. The present invention will be further described below in conjunction with the accompanying drawings.

如图1所示，串联补偿双有源无线电能传输系统，包括原边电路和副边电路组成。其中原边电路包括：有开关管S1～S4构成原边全桥变换器、原边采样电路、原边控制器和原边驱动电路。其中副边电路包括：由S5～S8构成的副边全桥变换器、副边采样电路、副边控制器和副边驱动电路。As shown in Figure 1, the series compensation dual active wireless power transmission system consists of a primary circuit and a secondary circuit. The primary-side circuit includes: a primary-side full-bridge converter, a primary-side sampling circuit, a primary-side controller, and a primary-side drive circuit composed of switch tubes S 1 -S 4 . The secondary side circuit includes: a secondary side full-bridge converter composed of S5 - S8 , a secondary side sampling circuit, a secondary side controller and a secondary side drive circuit.

串联补偿双有源无线电能传输系统的控制方法结构框图，如图2所示。A structural block diagram of a control method of a series compensation dual active wireless power transmission system is shown in FIG. 2 .

首先，副边采样电路分别采集直流侧输出电压Vo的幅值，以及交流侧输出电流i2的相位送入副边控制器；将采集到的直流侧输出电压Vo与直流侧输出参考值Voref做差比较，其差值经过PI调节器整定，得到副边全桥变换器占空比D2。First, the secondary-side sampling circuit separately collects the amplitude of the DC side output voltage V o and the phase of the AC side output current i 2 and sends them to the secondary side controller; the collected DC side output voltage V o and the DC side output reference value Voref makes a difference comparison, and the difference is adjusted by a PI regulator to obtain the duty ratio D 2 of the secondary full-bridge converter.

然后，以交流侧输出电流i2的相位过零点作为时间基准，交流侧输出电流i2在相位过零后，副边控制器控制副边全桥变换器开关管S6和S8导通，使得i2被短路(1-D2)*T时间，其中T为开关周期。交流侧输出电流i2在相位过零(1-D2)*T时间后，副边控制器控制副边全桥变换器开关管S6和S8的关断时，交流侧输出电流i2通过副边全桥变换器二极管D5和D7续流，从而实现副边全桥变换器占空比D2的调整，控制直流侧输出电压Vo稳定。副边控制器采用PLL控制与PWM控制相结合的工作方式，副边控制器计算出副边全桥变换器驱动信号时序，经驱动电路，驱动相应副边全桥变换器开关器件；Then, taking the phase zero-crossing point of the AC side output current i2 as the time reference, after the phase zero-crossing of the AC side output current i2 , the secondary side controller controls the switching tubes S6 and S8 of the secondary side full-bridge converter to conduct, Such that i 2 is short-circuited for (1-D 2 )*T time, where T is the switching period. When the output current i 2 of the AC side crosses zero phase (1-D 2 )*T time, when the secondary side controller controls the switching off of the switch tubes S 6 and S 8 of the secondary side full-bridge converter, the output current i 2 of the AC side The secondary full-bridge converter diodes D 5 and D 7 freewheel to realize the adjustment of the secondary full-bridge converter duty ratio D 2 and control the output voltage V o of the DC side to be stable. The secondary side controller adopts the working mode of combining PLL control and PWM control. The secondary side controller calculates the timing sequence of the driving signal of the secondary side full-bridge converter, and drives the corresponding secondary side full-bridge converter switching device through the driving circuit;

最后，原边采样电路分别采集直流侧输入电压Vin的幅值，以及交流侧输入电流i1的相位送入原边控制器，将采集到交流侧输入电流i1的相位过零点作为时间基准，原边控制器调整原边全桥变换器的占空比D1，通过采样检测到交流侧输入电流i1的相位，原边控制器不断调整原边全桥变换器的占空比D1，实现原边全桥变换器开关管开通时交流侧输入电流i1恰好过零。原边控制器采用PLL控制与PWM控制相结合的工作方式，计算出原边全桥变换器驱动信号时序，经驱动电路，驱动相应原边全桥变换器开关器件，实现原边全桥变换器开关管的ZVS软开关。Finally, the primary-side sampling circuit collects the amplitude of the input voltage Vin on the DC side and the phase of the input current i1 on the AC side and sends them to the primary-side controller, and takes the phase zero-crossing point of the input current i1 on the AC side as the time reference. The primary-side controller adjusts the duty cycle D 1 of the primary-side full-bridge converter, detects the phase of the input current i 1 on the AC side through sampling, and the primary-side controller continuously adjusts the duty cycle D 1 of the primary-side full-bridge converter, Realize that the input current i 1 of the AC side just crosses zero when the switching tube of the full-bridge converter on the primary side is turned on. The primary side controller adopts the combination of PLL control and PWM control to calculate the timing sequence of the driving signal of the primary side full bridge converter, and drive the corresponding switching device of the primary side full bridge converter through the driving circuit to realize the primary side full bridge converter ZVS soft switch of the switching tube.

该控制策略下，串联补偿双有源无线电能传输系统的运行波形图如图3所示。在无需通信设备的条件下，控制输出电压的稳定的同时，实现了两侧全桥变换器工作在软开关状态下，提高系统效率。Under this control strategy, the operating waveform diagram of the series compensation dual active wireless power transfer system is shown in Figure 3. Under the condition of not needing communication equipment, while controlling the stability of the output voltage, the full-bridge converter on both sides is realized to work in the soft switching state, and the system efficiency is improved.

Claims (1)

1.一种串联补偿双有源无线电能传输系统的控制方法，其特征在于，包括以下步骤：1. A control method of a series compensation dual active wireless power transmission system, characterized in that, comprising the following steps: 1)副边采样电路分别采集直流侧输出电压Vo的幅值，以及交流侧输出电流i2的相位送入副边控制器；1) The secondary-side sampling circuit collects the amplitude of the output voltage V o on the DC side and the phase of the output current i2 on the AC side and sends them to the secondary-side controller; 2)将步骤1)中采集到的直流侧输出电压Vo与直流侧输出参考值Voref做差比较，其差值经过PI调节器整定，得到副边全桥变换器占空比D2；2) Compare the difference between the DC side output voltage V o collected in step 1) and the DC side output reference value Voref, and the difference is adjusted by the PI regulator to obtain the duty ratio D2 of the secondary side full-bridge converter; 3)将步骤2)得到的副边全桥变换器占空比D2经过交流侧输出电流i2的相位过零点作为时间基准，副边控制器采用PLL控制与PWM控制相结合的工作方式，副边控制器计算出副边全桥变换器驱动信号时序，经驱动电路，驱动相应副边全桥变换器开关器件；以交流侧输出电流i2在相位过零作为计时起点，副边控制器控制副边全桥变换器的相位延迟，在相位延迟时间段，使得i2被短路，从而实现副边全桥变换器占空比D2的调整，控制直流侧输出电压Vo稳定；交流侧输出电流i2在相位延迟时间结束后，副边控制器控制副边全桥变换器开关管关断，交流侧输出电流i2通过副边全桥变换器二极管续流，交流侧输出电流i2过零时自然关断，实现副边全桥变换器的ZCS软开关；3) The duty ratio D2 of the secondary full-bridge converter obtained in step 2 ) passes through the zero-crossing point of the phase of the output current i2 of the AC side as a time reference, and the secondary controller adopts the working mode of combining PLL control and PWM control, The secondary side controller calculates the timing sequence of the driving signal of the secondary side full-bridge converter, and drives the corresponding secondary side full-bridge converter switching device through the driving circuit; taking the AC side output current i 2 at the phase zero crossing as the timing starting point, the secondary side controller Control the phase delay of the secondary full-bridge converter. During the phase delay period, i 2 is short-circuited, thereby realizing the adjustment of the duty ratio D 2 of the secondary full-bridge converter, and controlling the output voltage V o of the DC side to be stable; the AC side After the phase delay time of the output current i 2 ends, the secondary controller controls the switching tube of the secondary full-bridge converter to turn off, the AC side output current i 2 freewheels through the secondary full-bridge converter diode, and the AC side output current i 2 Turn off naturally when crossing zero, realizing ZCS soft switching of the secondary full-bridge converter; 4)原边采样电路分别采集直流侧输入电压Vin的幅值，以及交流侧输入电流i1的相位送入原边控制器；4) The primary-side sampling circuit collects the amplitude of the input voltage Vin on the DC side and the phase of the input current i1 on the AC side and sends them to the primary-side controller; 5)将步骤4)中采集到交流侧输入电流i1的相位过零点作为时间基准，原边控制器调整原边全桥变换器的占空比D1，输出原边全桥变换器驱动信号时序，经驱动电路，驱动相应原边全桥变换器开关器件，原边控制器采用PLL控制与PWM控制相结合的工作方式，使得原边开关管开通时，交流侧输入电流i1的相位过零；通过采样检测到交流侧输入电流i1的相位，原边控制器不断调整原边全桥变换器的占空比D1，实现原边全桥变换器开关管开通时交流侧输入电流i1恰好过零，原边控制器计算出原边全桥变换器驱动信号时序，经驱动电路，驱动相应原边全桥变换器开关器件，实现原边全桥变换器开关管的ZVS软开关。5) Taking the phase zero-crossing point of the AC side input current i 1 collected in step 4) as the time reference, the primary-side controller adjusts the duty ratio D 1 of the primary-side full-bridge converter, and outputs the driving signal of the primary-side full-bridge converter Sequence, through the drive circuit, drives the corresponding primary side full bridge converter switching device, the primary side controller adopts the working mode of PLL control and PWM control, so that when the primary side switch tube is turned on, the phase of the AC side input current i 1 is over Zero; the phase of the input current i 1 on the AC side is detected by sampling, and the primary side controller continuously adjusts the duty ratio D 1 of the full bridge converter on the primary side to realize the input current i on the AC side when the switching tube of the full bridge converter on the primary side is turned on. 1 just crosses zero, the primary-side controller calculates the timing sequence of the driving signal of the primary-side full-bridge converter, drives the corresponding primary-side full-bridge converter switching device through the driving circuit, and realizes the ZVS soft switching of the primary-side full-bridge converter switching tube.
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