CN108565979A - A kind of radio energy dynamic constant power output system and its equivalent resistance control method - Google Patents
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- H—ELECTRICITY
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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
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Abstract
Description
技术领域technical field
本发明涉及轨道交通无线电能动态传输技术领域，更具体的是涉及一种无线电能动态恒功率输出系统及其等效电阻控制方法。The invention relates to the technical field of wireless energy dynamic transmission in rail transit, and more specifically relates to a wireless energy dynamic constant power output system and an equivalent resistance control method thereof.
背景技术Background technique
无线电能传输系统利用高频电磁场近场耦合原理，以高频磁场作为传输介质，通过发送线圈和接收线圈间的磁场耦合实现电能的无线传输。无线电能传输系统主要由两个部分组成，一部分是连接在电源一侧的发送端，另一部分是位于负载侧的接收端，能量通过电磁感应的方式由发送端传输到接收端。现有的无线电能传输系统主要由发送端的直流电源、逆变器、发送线圈和发送补偿电容以及接收端的接受线圈、接收补偿电容、整流器和负载组成。The wireless power transmission system uses the principle of high-frequency electromagnetic field near-field coupling, uses high-frequency magnetic field as the transmission medium, and realizes the wireless transmission of electric energy through the magnetic field coupling between the sending coil and the receiving coil. The wireless power transmission system is mainly composed of two parts, one is the transmitting end connected to the power supply side, and the other is the receiving end located on the load side. The energy is transmitted from the transmitting end to the receiving end through electromagnetic induction. The existing wireless power transmission system is mainly composed of a DC power supply, an inverter, a sending coil, and a sending compensation capacitor at the sending end, and a receiving coil, a receiving compensation capacitor, a rectifier, and a load at the receiving end.
目前绝大部分的用电设备主要采用传统接触供电方式进行充电，这种充电方式存在充电电流大、笨重且不美观、机械磨损及漏电等安全隐患。无线电能传输技术可以很好的克服上述弊端，具有便捷、美观、安全以及灵活性高等优点。在指定区域给用电设备充电应用的技术被称作静态无线电能传输技术，然而，静态无线充电技术受到当前储能电池技术发展的制约，存在诸多问题，如续航短、充电时间长、频繁充电、电池组笨重等。基于这种背景，人们开始了对动态无线供电技术的研究，并将动态无线供电技术应用于电动汽车、轨道交通等领域。At present, the vast majority of electrical equipment mainly adopts the traditional contact power supply method for charging. This charging method has potential safety hazards such as large charging current, bulky and unsightly appearance, mechanical wear and leakage. Wireless power transmission technology can well overcome the above disadvantages, and has the advantages of convenience, beauty, safety and high flexibility. The technology used to charge electrical equipment in a designated area is called static wireless power transfer technology. However, static wireless charging technology is restricted by the development of current energy storage battery technology, and there are many problems, such as short battery life, long charging time, and frequent charging. , The battery pack is bulky, etc. Based on this background, people began to study dynamic wireless power supply technology, and applied dynamic wireless power supply technology to electric vehicles, rail transit and other fields.
以非接触的方式给行驶中的用电设备提供能量，设备可搭载较轻的电池组，同时可解决续航里程短的问题，降低制造成本。然而，国内外研究表明，动态无线电能传输相比于静态无线电能传输，耦合系数变化波动大，空间位置的变化如横向和纵向偏移，使得系统输出功率和工作效率不稳定，难以适合接收端的快速移动。Provide energy to the driving electrical equipment in a non-contact manner. The equipment can be equipped with a lighter battery pack, and at the same time, it can solve the problem of short cruising range and reduce manufacturing costs. However, studies at home and abroad have shown that compared with static wireless power transfer, dynamic wireless power transfer has large fluctuations in coupling coefficients, and changes in spatial positions such as lateral and vertical offsets make the system output power and work efficiency unstable, making it difficult to adapt to the receiving end. move quickly.
发明内容Contents of the invention
本发明的目的在于：为了解决在轨道交通领域，现有的动态无线电能传输技术由于空间位置的偏移变化，耦合系数变化波动较大导致无法保证系统功率稳定输出的问题，本发明提供一种无线电能动态恒功率输出系统及其等效电阻控制方法。The purpose of the present invention is to solve the problem that in the field of rail transit, the existing dynamic wireless power transmission technology cannot guarantee the stable output of the system power due to the offset change of the spatial position and the large fluctuation of the coupling coefficient. Wireless energy dynamic constant power output system and its equivalent resistance control method.
本发明为了实现上述目的具体采用以下技术方案：The present invention specifically adopts the following technical solutions in order to achieve the above object:
一种无线电能动态恒功率输出系统，包括发送端和接收端，发送端包括发送线圈Lp，其特征在于：所述接收端包括分别与负载R连接的副边组件1和副边组件2，副边组件1包括与发送线圈Lp平行的接收线圈Ls1，副边组件2包括与发送线圈Lp平行的接收线圈Ls2，所述接收线圈Ls1和接收线圈Ls2分别由边长为L的正方形线圈组成，发送线圈Lp由若干个边长为L的正方形线圈级联组成，接收线圈Ls1与接收线圈Ls2重叠构成副边线圈组，且接收线圈Ls1与接收线圈Ls2重叠部分的长度为L/2。A wireless energy dynamic constant power output system, including a transmitting end and a receiving end, the transmitting end includes a transmitting coil Lp, characterized in that: the receiving end includes a secondary component 1 and a secondary component 2 respectively connected to a load R, the secondary component The side assembly 1 includes a receiving coil Ls1 parallel to the sending coil Lp, and the secondary side assembly 2 includes a receiving coil Ls2 parallel to the sending coil Lp, and the receiving coil Ls1 and the receiving coil Ls2 are respectively composed of square coils with a side length of L. The coil Lp is composed of several cascaded square coils with a side length L. The receiving coil Ls1 and the receiving coil Ls2 overlap to form a secondary coil group, and the length of the overlapping part of the receiving coil Ls1 and the receiving coil Ls2 is L/2.
进一步的，所述发送端还包括直流电源E、全桥逆变器I1、发送谐振电感Lt和发送补偿电容Cp，直流电源E与全桥逆变器I1连接，全桥逆变器I1通过发送谐振电感Lt与相互并联的发送线圈Lp和发送补偿电容Cp连接。Further, the sending end also includes a DC power supply E, a full-bridge inverter I1, a sending resonant inductance Lt, and a sending compensation capacitor Cp, the DC power supply E is connected to the full-bridge inverter I1, and the full-bridge inverter I1 transmits The resonant inductance Lt is connected to the transmitting coil Lp and the transmitting compensation capacitor Cp which are connected in parallel.
进一步的，所述副边组件1还包括接收补偿电容Cs1、全控整流器H1和直流滤波电容Cd1，接收线圈Ls1与接收补偿电容Cs1串联后与全控整流器H1连接，全控整流器H1与与负载R并联的直流滤波电容Cd1连接；Further, the secondary side assembly 1 also includes a receiving compensation capacitor Cs1, a fully controlled rectifier H1 and a DC filter capacitor Cd1, the receiving coil Ls1 is connected in series with the receiving compensating capacitor Cs1 and connected to the fully controlled rectifier H1, and the fully controlled rectifier H1 is connected to the load The DC filter capacitor Cd1 connected in parallel with R is connected;
所述副边组件2还包括接收补偿电容Cs2、全控整流器H2和直流滤波电容Cd2，接收线圈Ls2与接收补偿电容Cs2串联后与全控整流器H2连接，全控整流器H2与与负载R并联的直流滤波电容Cd2连接。The secondary side assembly 2 also includes a receiving compensation capacitor Cs2, a fully controlled rectifier H2 and a DC filter capacitor Cd2, the receiving coil Ls2 is connected in series with the receiving compensating capacitor Cs2 and connected to the fully controlled rectifier H2, and the fully controlled rectifier H2 is connected in parallel with the load R DC filter capacitor Cd2 connection.
进一步的，所述全控整流器H1连接有接收端控制器KP1，全控整流器H2连接有接收端控制器KP2，接收端控制器KP1连接有分别用于测副边组件1的输出电压UO1的直流电压传感器UO1和输出电流IO1的直流电流传感器IO1；接收端控制器KP2连接有分别用于测副边组件2的输出电压UO2的直流电压传感器UO2和输出电流IO2的直流电流传感器IO2。Further, the fully-controlled rectifier H1 is connected to a receiving-end controller KP1, the fully-controlled rectifier H2 is connected to a receiving-end controller KP2, and the receiving-end controller KP1 is connected to a receiver for measuring the output voltage U O1 of the secondary component 1. The DC voltage sensor UO1 and the DC current sensor IO1 of the output current IO1 ; the receiver controller KP2 is connected with the DC voltage sensor UO2 and the DC current sensor IO2 of the output current IO2 for measuring the output voltage UO2 of the secondary side component 2 respectively .
当副边线圈组沿平行于发送线圈Lp的长度方向移动X长度时，本发明的系统工作原理为：When the secondary coil group moves X length along the length direction parallel to the sending coil Lp, the working principle of the system of the present invention is:
发送线圈Lp与接收线圈Ls1之间的互感M1满足：The mutual inductance M1 between the sending coil Lp and the receiving coil Ls1 satisfies:
M1＝Mmax1·sin(A·X+B)M 1 ＝M max1 ·sin(A·X+B)
发送线圈Lp与接收线圈Ls2之间的互感M2满足：The mutual inductance M2 between the sending coil Lp and the receiving coil Ls2 satisfies:
M2＝Mmax2·cos(A·X+B)M 2 ＝M max2 ·cos(A·X+B)
其中，Mmax1是发送线圈Lp对接收线圈Ls1的互感最大值，Mmax2是发送线圈Lp对接收线圈Ls2的互感最大值，Mmax1和Mmax2相同，A、B为系数；Among them, M max1 is the maximum value of the mutual inductance of the transmitting coil Lp to the receiving coil Ls1, M max2 is the maximum value of the mutual inductance of the transmitting coil Lp to the receiving coil Ls2, M max1 and M max2 are the same, and A and B are coefficients;
由于接收线圈Ls1和接收线圈Ls2重叠部分的长度为L/2，所以互感M1和互感M2在副边线圈组移动的过程中始终满足同一三角函数相位互差90°的关系，即：Since the length of the overlapping part of the receiving coil Ls1 and the receiving coil Ls2 is L/2, the mutual inductance M1 and the mutual inductance M2 always satisfy the relationship of the same trigonometric function with a phase difference of 90° during the movement of the secondary coil group, namely:
M1 2+M2 2＝Mmax 2，其中Mmax＝Mmax1＝Mmax2；M 1 2 +M 2 2 =M max 2 , where M max =M max1 =M max2 ;
本发明中的接收线圈Ls1和接收线圈Ls2采用重叠耦合的方式，当副边线圈组的结构固定后，Mmax是固定值，由此能够确保互感M1和互感M2的平方和在副边线圈组的移动过程中保持不变，为动态供电的系统功率稳定输出奠定了基础。The receiving coil Ls1 and the receiving coil Ls2 in the present invention adopt the overlapping coupling mode. When the structure of the secondary side coil group is fixed, Mmax is a fixed value, thereby ensuring that the sum of the squares of the mutual inductance M1 and the mutual inductance M2 is on the secondary side The coil group remains unchanged during the moving process, which lays the foundation for the stable output of dynamic power supply system power.
一种无线电能动态恒功率传输系统等效电阻的控制方法，包括以下步骤：A method for controlling equivalent resistance of a wireless energy dynamic constant power transmission system, comprising the following steps:
S1、待定等效电阻RLeq的计算S1. Calculation of the undetermined equivalent resistance R Leq
计算全控整流器H1输入端前侧和全控整流器H2输入端前侧需要控制的待定等效电阻RLeq：Calculate the undetermined equivalent resistance R Leq that needs to be controlled on the front side of the input terminal of the fully controlled rectifier H1 and the front side of the input terminal of the fully controlled rectifier H2:
RLeq＝ω·MT R Leq = ω M T
其中，ω为输出系统工作角频率，MT为接收线圈Ls1与接收线圈Ls2之间的互感值；Among them, ω is the operating angular frequency of the output system, M T is the mutual inductance value between the receiving coil Ls1 and the receiving coil Ls2;
S2、实际等效电阻的计算S2. Calculation of actual equivalent resistance
接收端控制器KP1接收到直流电压传感器UO1测得的输出电压UO1和直流电流传感器IO1测得的输出电流IO1，得到当前时刻的负载电阻RL1＝Uo1/Io1，折算到全控整流器H1前侧的实际等效电阻RLeq1：The receiver controller KP1 receives the output voltage U O1 measured by the DC voltage sensor UO1 and the output current I O1 measured by the DC current sensor IO1, and obtains the load resistance R L1 = U o1 /I o1 at the current moment, which is converted to the full control The actual equivalent resistance R Leq1 on the front side of the rectifier H1:
接收端控制器KP2接收到直流电压传感器UO2测得的输出电压UO2和直流电流传感器IO2测得的输出电流IO2，得到当前时刻的负载电阻RL2＝Uo2/Io2，折算到全控整流器H2前侧的实际等效电阻RLeq2：The receiver controller KP2 receives the output voltage U O2 measured by the DC voltage sensor UO2 and the output current I O2 measured by the DC current sensor IO2, and obtains the load resistance R L2 = U o2 /I o2 at the current moment, which is converted to the full control The actual equivalent resistance R Leq2 on the front side of the rectifier H2:
其中，β1为全控整流器H1的导通角，β2为全控整流器H2的导通角；Wherein, β1 is the conduction angle of the fully controlled rectifier H1, and β2 is the conduction angle of the fully controlled rectifier H2;
S3、恒功率输出的实现S3. Realization of constant power output
通过接收端控制器KP1和接收端控制器KP2分别控制导通角β1、β2，实现RLeq1＝RLeq2＝RLeq，当满足RLeq1＝RLeq2＝RLeq后，副边组件1的输出功率PS1和副边组件2的输出功率PS2分别为：The conduction angles β 1 and β 2 are respectively controlled by the receiving-end controller KP1 and the receiving-end controller KP2 to realize R Leq1 = R Leq2 = R Leq . When R Leq1 = R Leq2 = R Leq is satisfied, the secondary side component 1 The output power P S1 and the output power P S2 of the secondary side component 2 are respectively:
其中，E是直流电源E的输入电压值，Lt是发送谐振电感Lt的电感值；Wherein, E is the input voltage value of the DC power supply E, L t is the inductance value of the transmitting resonant inductor Lt;
由此得出PS1＝PS2，并且由于M1 2+M2 2＝Mmax 2是固定值，则副边组件1和副边组件2的输出功率在移动过程中维持不变，进而系统总功率也保持恒定，实现恒功率输出。From this, it can be concluded that P S1 = P S2 , and since M 1 2 +M 2 2 =M max 2 is a fixed value, the output power of secondary side assembly 1 and secondary side assembly 2 remains unchanged during the moving process, and the system The total power is also kept constant to achieve constant power output.
本发明的有益效果如下：The beneficial effects of the present invention are as follows:
1、本发明中的接收线圈Ls1和接收线圈Ls2采用重叠耦合的方式，并且接收线圈Ls1与接收线圈Ls2重叠部分的长度为L/2，保证了互感M1曲线移相1/4周期得到互感M2曲线，互感M2曲线移相1/4周期得到互感M1曲线，互感M1和互感M2的平方和在副边线圈组的移动过程中保持不变，为动态供电的系统功率稳定输出奠定了基础。1. The receiving coil Ls1 and the receiving coil Ls2 in the present invention adopt the overlapping coupling mode, and the length of the overlapping part of the receiving coil Ls1 and the receiving coil Ls2 is L/2, which ensures that the mutual inductance M1 curve phase shifts 1/4 cycle to obtain the mutual inductance The M 2 curve, the mutual inductance M 2 curve is shifted by 1/4 cycle to obtain the mutual inductance M 1 curve, the square sum of the mutual inductance M 1 and the mutual inductance M 2 remains unchanged during the movement of the secondary coil group, and the power of the dynamic power supply system is stable The output lays the groundwork.
2、本发明能够在副边线圈组移动供电的过程中，控制全控整流器H1和全控整流器H2前侧的等效电阻为恒定值，该值由接收线圈Ls1与接收线圈Ls2的耦合互感值确定，保证了副边线圈组在移动过程中的总功率在副边组件1的接收端和副边组件2的接收端中平均分配，不仅能够减小开关管的电压电流应力，并且保证了系统输出功率恒定。2. The present invention can control the equivalent resistance on the front side of the fully-controlled rectifier H1 and the fully-controlled rectifier H2 to be a constant value during the process of moving the power supply of the secondary coil group, and this value is determined by the coupling mutual inductance value of the receiving coil Ls1 and the receiving coil Ls2 It is determined that the total power of the secondary coil group is evenly distributed between the receiving end of the secondary side assembly 1 and the receiving end of the secondary side assembly 2 during the moving process, which not only reduces the voltage and current stress of the switch tube, but also ensures that the system The output power is constant.
附图说明Description of drawings
图1是本发明的电路结构图。Fig. 1 is a circuit structure diagram of the present invention.
图2是本发明接收线圈Ls1和接收线圈Ls2的耦合结构图。Fig. 2 is a coupling structure diagram of the receiving coil Ls1 and the receiving coil Ls2 of the present invention.
具体实施方式Detailed ways
为了本技术领域的人员更好的理解本发明，下面结合附图和以下实施例对本发明作进一步详细描述。In order for those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and the following embodiments.
实施例1Example 1
如图1所示，本实施例提供一种无线电能动态恒功率输出系统，包括发送端和接收端，发送端包括发送线圈Lp，接收端包括分别与负载R连接的副边组件1和副边组件2，副边组件1包括与发送线圈Lp平行的接收线圈Ls1，副边组件2包括与发送线圈Lp平行的接收线圈Ls2，所述接收线圈Ls1和接收线圈Ls2分别由边长为L的正方形线圈组成，发送线圈Lp由4个边长为L的正方形线圈级联组成，接收线圈Ls1与接收线圈Ls2重叠构成副边线圈组，且接收线圈Ls1与接收线圈Ls2重叠部分的长度为L/2。As shown in Figure 1, this embodiment provides a wireless energy dynamic constant power output system, including a transmitting end and a receiving end, the transmitting end includes a transmitting coil Lp, and the receiving end includes a secondary side component 1 and a secondary side component respectively connected to a load R Component 2, the secondary component 1 includes a receiving coil Ls1 parallel to the transmitting coil Lp, the secondary component 2 comprises a receiving coil Ls2 parallel to the transmitting coil Lp, and the receiving coil Ls1 and the receiving coil Ls2 are respectively formed by a square whose side length is L Composed of coils, the transmitting coil Lp is composed of four square coils with a side length of L cascaded, the receiving coil Ls1 and the receiving coil Ls2 overlap to form a secondary coil group, and the length of the overlapping part of the receiving coil Ls1 and the receiving coil Ls2 is L/2 .
所述发送端还包括直流电源E、全桥逆变器I1、发送谐振电感Lt和发送补偿电容Cp，直流电源E与全桥逆变器I1连接，全桥逆变器I1通过发送谐振电感Lt与相互并联的发送线圈Lp和发送补偿电容Cp连接。The sending end also includes a DC power supply E, a full-bridge inverter I1, a sending resonant inductance Lt and a sending compensation capacitor Cp, the DC power supply E is connected to the full-bridge inverter I1, and the full-bridge inverter I1 passes through the sending resonant inductance Lt It is connected with the sending coil Lp and the sending compensation capacitor Cp connected in parallel.
所述副边组件1还包括接收补偿电容Cs1、全控整流器H1和直流滤波电容Cd1，接收线圈Ls1与接收补偿电容Cs1串联后与全控整流器H1连接，全控整流器H1与与负载R并联的直流滤波电容Cd1连接；所述副边组件2还包括接收补偿电容Cs2、全控整流器H2和直流滤波电容Cd2，接收线圈Ls2与接收补偿电容Cs2串联后与全控整流器H2连接，全控整流器H2与与负载R并联的直流滤波电容Cd2连接。The secondary component 1 also includes a receiving compensation capacitor Cs1, a fully-controlled rectifier H1, and a DC filter capacitor Cd1. The receiving coil Ls1 is connected in series with the receiving compensating capacitor Cs1 and connected to the fully-controlled rectifier H1. The fully-controlled rectifier H1 is connected in parallel with the load R. The DC filter capacitor Cd1 is connected; the secondary component 2 also includes a receiving compensation capacitor Cs2, a fully-controlled rectifier H2 and a DC filter capacitor Cd2, and the receiving coil Ls2 is connected in series with the receiving compensating capacitor Cs2 to the fully-controlled rectifier H2, and the fully-controlled rectifier H2 Connect with the DC filter capacitor Cd2 connected in parallel with the load R.
所述全控整流器H1连接有接收端控制器KP1，全控整流器H2连接有接收端控制器KP2，接收端控制器KP1连接有分别用于测副边组件1的输出电压UO1的直流电压传感器UO1和输出电流IO1的直流电流传感器IO1；接收端控制器KP2连接有分别用于测副边组件2的输出电压UO2的直流电压传感器UO2和输出电流IO2的直流电流传感器IO2。The fully-controlled rectifier H1 is connected to a receiving-end controller KP1, the fully-controlled rectifier H2 is connected to a receiving-end controller KP2, and the receiving-end controller KP1 is connected to a DC voltage sensor for measuring the output voltage U O1 of the secondary side component 1 respectively. UO1 and the DC current sensor IO1 of the output current IO1 ; the receiver controller KP2 is connected with a DC voltage sensor UO2 and a DC current sensor IO2 of the output current IO2 for measuring the output voltage UO2 of the secondary side component 2 respectively.
如图2所示，当接收线圈Ls1与发送线圈Lp的一个正方形线圈正对时，接收线圈Ls2正好位于那个正方形线圈以及后一个正方向线圈的中间处，当副边线圈组沿y轴正方向移动X长度时，As shown in Figure 2, when the receiving coil Ls1 is facing a square coil of the transmitting coil Lp, the receiving coil Ls2 is just in the middle of that square coil and the next positive direction coil, when the secondary coil group is along the positive direction of the y-axis When moving the X length,
发送线圈Lp与接收线圈Ls1之间的互感M1满足：The mutual inductance M1 between the sending coil Lp and the receiving coil Ls1 satisfies:
M1＝Mmax1·sin(A·X+B)M 1 ＝M max1 ·sin(A·X+B)
发送线圈Lp与接收线圈Ls2之间的互感M2满足：The mutual inductance M2 between the sending coil Lp and the receiving coil Ls2 satisfies:
M2＝Mmax2·cos(A·X+B)M 2 ＝M max2 ·cos(A·X+B)
其中，Mmax1是发送线圈Lp对接收线圈Ls1的互感最大值，Mmax2是发送线圈Lp对接收线圈Ls2的互感最大值，A、B为系数；当发送线圈Lp分别与接收线圈Ls1和接收线圈Ls2正对时，存在互感最大值Mmax1和Mmax2，且Mmax1和Mmax2相同；Among them, M max1 is the maximum value of the mutual inductance of the transmitting coil Lp to the receiving coil Ls1, M max2 is the maximum value of the mutual inductance of the transmitting coil Lp to the receiving coil Ls2, and A and B are coefficients; when the transmitting coil Lp is connected to the receiving coil Ls1 and the receiving coil When Ls2 is positive, there are mutual inductance maximums M max1 and M max2 , and M max1 and M max2 are the same;
由于接收线圈Ls1和接收线圈Ls2重叠部分的长度为L/2，所以互感M1和互感M2在副边线圈组移动的过程中始终满足同一三角函数相位互差90°的关系，即：Since the length of the overlapping part of the receiving coil Ls1 and the receiving coil Ls2 is L/2, the mutual inductance M1 and the mutual inductance M2 always satisfy the relationship of the same trigonometric function with a phase difference of 90° during the movement of the secondary coil group, namely:
M1 2+M2 2＝Mmax 2，其中Mmax＝Mmax1＝Mmax2；M 1 2 +M 2 2 =M max 2 , where M max =M max1 =M max2 ;
本实施例中的接收线圈Ls1和接收线圈Ls2采用重叠耦合的方式，当副边线圈组的结构固定后，Mmax是固定值，由此能够确保互感M1和互感M2的平方和在副边线圈组的移动过程中保持不变，为动态供电的系统功率稳定输出奠定了基础。The receiving coil Ls1 and the receiving coil Ls2 in this embodiment adopt the overlapping coupling mode. When the structure of the secondary coil group is fixed, M max is a fixed value, thereby ensuring that the square sum of the mutual inductance M1 and the mutual inductance M2 is in the secondary The side coil group remains unchanged during the moving process, which lays the foundation for the stable output of dynamic power supply system power.
一种无线电能动态恒功率传输系统等效电阻的控制方法，包括以下步骤：A method for controlling equivalent resistance of a wireless energy dynamic constant power transmission system, comprising the following steps:
S1、待定等效电阻RLeq的计算S1. Calculation of the undetermined equivalent resistance R Leq
计算全控整流器H1输入端前侧和全控整流器H2输入端前侧需要控制的待定等效电阻RLeq：Calculate the undetermined equivalent resistance R Leq that needs to be controlled on the front side of the input terminal of the fully controlled rectifier H1 and the front side of the input terminal of the fully controlled rectifier H2:
RLeq＝ω·MT R Leq = ω M T
其中，ω为输出系统工作角频率，MT为接收线圈Ls1与接收线圈Ls2之间的互感值；Among them, ω is the operating angular frequency of the output system, M T is the mutual inductance value between the receiving coil Ls1 and the receiving coil Ls2;
S2、实际等效电阻的计算S2. Calculation of actual equivalent resistance
接收端控制器KP1接收到直流电压传感器UO1测得的输出电压UO1和直流电流传感器IO1测得的输出电流IO1，得到当前时刻的负载电阻RL1＝Uo1/Io1，折算到全控整流器H1前侧的实际等效电阻RLeq1：The receiver controller KP1 receives the output voltage U O1 measured by the DC voltage sensor UO1 and the output current I O1 measured by the DC current sensor IO1, and obtains the load resistance R L1 = U o1 /I o1 at the current moment, which is converted to the full control The actual equivalent resistance R Leq1 on the front side of the rectifier H1:
接收端控制器KP2接收到直流电压传感器UO2测得的输出电压UO2和直流电流传感器IO2测得的输出电流IO2，得到当前时刻的负载电阻RL2＝Uo2/Io2，折算到全控整流器H2前侧的实际等效电阻RLeq2：The receiver controller KP2 receives the output voltage U O2 measured by the DC voltage sensor UO2 and the output current I O2 measured by the DC current sensor IO2, and obtains the load resistance R L2 = U o2 /I o2 at the current moment, which is converted to the full control The actual equivalent resistance R Leq2 on the front side of the rectifier H2:
其中，β1为全控整流器H1的导通角，β2为全控整流器H2的导通角；Wherein, β1 is the conduction angle of the fully controlled rectifier H1, and β2 is the conduction angle of the fully controlled rectifier H2;
S3、恒功率输出的实现S3. Realization of constant power output
接收端控制器KP1和接收端控制器KP2分别通过PI控制器实现对导通角β1和β2的控制，实现RLeq1＝RLeq2＝RLeq，当满足RLeq1＝RLeq2＝RLeq后，副边组件1的输出功率PS1和副边组件2的输出功率PS2分别为：The receiver controller KP1 and the receiver controller KP2 control the conduction angles β 1 and β 2 respectively through the PI controller to realize R Leq1 = R Leq2 = R Leq , when R Leq1 = R Leq2 = R Leq , the output power P S1 of secondary side component 1 and the output power P S2 of secondary side component 2 are respectively:
其中，E是直流电源E的输入电压值，Lt是发送谐振电感Lt的电感值；Wherein, E is the input voltage value of the DC power supply E, L t is the inductance value of the transmitting resonant inductor Lt;
由此得出PS1＝PS2，并且由于M1 2+M2 2＝Mmax 2是固定值，则副边组件1和副边组件2的输出功率在移动过程中维持不变，进而系统总功率也保持恒定，实现恒功率输出。From this, it can be concluded that P S1 = P S2 , and since M 1 2 +M 2 2 =M max 2 is a fixed value, the output power of secondary side assembly 1 and secondary side assembly 2 remains unchanged during the moving process, and the system The total power is also kept constant to achieve constant power output.
以上所述，仅为本发明的较佳实施例，并不用以限制本发明，本发明的专利保护范围以权利要求书为准，凡是运用本发明的说明书及附图内容所作的等同结构变化，同理均应包含在本发明的保护范围内。The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the description and accompanying drawings of the present invention, All should be included in the protection scope of the present invention in the same way.
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