Method for suppressing multiple active bridge blocking boost, storage medium, transformer

Abstract

The application discloses a kind of multi-active bridge lock-in boost suppression method, storage medium, transformer, wherein multi-active bridge lock-in boost suppression method includes the following steps: when there is lock-in H bridge in multi-active bridge, determine the junction capacitance value of lock-in H bridge, and determine the equivalent inductance value between at least one non-lock-in H bridge and lock-in H bridge;According to equivalent inductance value and junction capacitance value, determine the phase difference of two-phase bridge arm of at least one non-lock-in H bridge;According to the phase difference of two-phase bridge arm, at least one non-lock-in H bridge is controlled to move inwards, to inhibit the port voltage of lock-in H bridge.This way, the multi-active bridge lock-in boost suppression method of the application can ensure that when lock-in H bridge appears in multi-active bridge, it can still be under safe current voltage, and other non-lock-in H bridges in multi-active bridge can also operate normally, improve the working efficiency and service life of multi-active bridge.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, and particularly relates to a multiple active bridge lock-up boost suppression method, a computer readable storage medium and a power electronic transformer. BACKGROUND

[0002] The power electronic transformer is a new power supply device for smart grid, which can be used for connecting power grid, distributed power generation, energy storage and load at the same time. The previous power electronic transformer is mostly based on dual active bridge (DAB) to achieve, and in recent years, the multiple active bridge (MAB) is used to build a multi-port power electronic transformer, which becomes a new technical direction. The MAB is also the core component as a basic power unit, and the main circuit topology thereof is shown in FIG. 1, wherein each port is represented by one H bridge. Figure 1

[0003] In normal operation, the DC voltage of each H bridge is controlled near the respective reference value. When the H bridge of a certain port is pulse-locked, the other still running ports will continuously inject energy to the locked H bridge, resulting in rapid rise of the DC voltage thereof. Usually, such lock-up boost will trigger overvoltage protection, resulting in shutdown of the device, and in severe cases, may cause component failure.

[0004] In the related art, the protection strategy adopted is: first, when any port of the power electronic transformer is locked, all other running ports are actively locked to avoid the phenomenon of lock-up boost; second, when any port of the power electronic transformer is locked, the other ports remain in the running state, and when the DC voltage of the locked port rises to the overvoltage protection threshold, the protection action is triggered to lock and shut down all other running ports. SUMMARY

[0005] The protection methods adopted in the related art do not solve the problem of lock-up boost from the root, but avoid the disadvantages brought by the boost by shutting down or locking the running ports, thereby seriously affecting the working efficiency of the multiple active bridge and failing to enable the normal ports to work normally.

[0006] The present application aims to at least solve one of the technical problems in the related art to some extent. To this end, one object of the present application is to provide a multiple active bridge lock-up boost suppression method, which can ensure that when a locked H bridge appears in the multiple active bridge, it can still be in a safe current and voltage, and the other non-locked H bridges in the multiple active bridge can also operate normally, thereby improving the working efficiency and service life of the multiple active bridge.

[0007] A second object of the present application is to provide a power electronic transformer. ​

[0008] A third object of the present application is to propose a computer-readable storage medium.

[0009] A fourth object of the present application is to propose another power electronic transformer.

[0010] To achieve the above objects, the first aspect of the present application proposes a method for suppressing lock-up voltage rise in a multi-active bridge, comprising the following steps: when a lock-up H-bridge exists in the multi-active bridge, determining a junction capacitance value of the lock-up H-bridge, and determining an equivalent inductance value between at least one non-lock-up H-bridge and the lock-up H-bridge; determining a two-phase bridge arm phase difference of the at least one non-lock-up H-bridge according to the equivalent inductance value and the junction capacitance value; and performing internal phase shift control on the at least one non-lock-up H-bridge according to the two-phase bridge arm phase difference, so as to suppress a port voltage of the lock-up H-bridge.

[0011] When a lock-up H-bridge exists in the multi-active bridge, the embodiment of the present application further determines a junction capacitance value corresponding to the lock-up H-bridge, and then determines an equivalent inductance value between any one or more non-lock-up H-bridges in the multi-active bridge and the lock-up H-bridge, and then determines a two-phase bridge arm phase difference of each non-lock-up H-bridge according to the equivalent inductance value and the junction capacitance value, and performs internal phase shift control on the non-lock-up H-bridge according to the two-phase bridge arm phase difference, so as to suppress a port voltage corresponding to the lock-up H-bridge. Thus, the method for suppressing lock-up voltage rise in a multi-active bridge can ensure that the multi-active bridge is still in a safe current and voltage when a lock-up H-bridge appears in the multi-active bridge, and other non-lock-up H-bridges in the multi-active bridge can also operate normally, thereby improving the working efficiency and service life of the multi-active bridge.

[0012] In some embodiments of the present application, the two-phase bridge arm phase difference is determined according to the following formula: wherein, is the two-phase bridge arm phase difference, L is the equivalent inductance value, and C J is the junction capacitance value.

[0013] In some embodiments of the present application, after determining the junction capacitance value of the lock-up H-bridge, the method further comprises: determining an equivalent inductance value between each non-lock-up H-bridge and the lock-up H-bridge; determining a two-phase bridge arm phase difference of each non-lock-up H-bridge according to the equivalent inductance value between each non-lock-up H-bridge and the lock-up H-bridge, and the junction capacitance value; and performing internal phase shift control on the corresponding non-lock-up H-bridge according to the two-phase bridge arm phase difference of each non-lock-up H-bridge.

[0014] In some embodiments of the present invention, when performing internal phase shift control on the corresponding unblocked H-bridge based on the phase difference between the two phase arms of each unblocked H-bridge, the method further includes: determining the port voltage phase of each unblocked H-bridge, and performing external phase shift control on the corresponding unblocked H-bridge based on the port voltage phase of each unblocked H-bridge.

[0015] In some embodiments of the present invention, determining the port voltage phase of each unlocked H-bridge includes: setting the port voltage phase of a first unlocked H-bridge as a reference value, wherein the first unlocked H-bridge is any unlocked H-bridge; acquiring the port voltage of each unlocked H-bridge, and acquiring the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges (excluding the first unlocked H-bridge) and the first unlocked H-bridge, and acquiring the operating frequency of the multi-active bridge; determining the port voltage phase of the other unlocked H-bridges based on the port voltage of each unlocked H-bridge, the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge, and the operating frequency of the multi-active bridge.

[0016] In some embodiments of the present invention, the port voltage phase of the other unblocked H-bridge is determined according to the following formula: Where k is the port number of the other unblocked H-bridge, P 1,k n represents the transmission power between the other unblocked H-bridges and the first unblocked H-bridge. 1,k L is the isolation transformer turns ratio between the other unlocked H-bridges and the first unlocked H-bridge. 1,k d is the equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge. 1,k Let f be the phase of the port voltage of the other unblocked H-bridges, f be the operating frequency of the multiple active bridges, u1 be the port voltage of the first unblocked H-bridge, and u k The port voltage of the other unblocked H-bridges.

[0017] In some embodiments of the present invention, the reference value is zero.

[0018] To achieve the above objectives, a second aspect of the present invention provides a power electronic transformer, including a multi-active bridge, a memory, a processor, and a multi-active bridge blockade boost suppression program stored in the memory and executable on the processor. When the processor executes the multi-active bridge blockade boost suppression program, it implements the multi-active bridge blockade boost suppression method according to the above embodiment.

[0019] The power electronic transformer of this invention executes a multi-active bridge blocking boost suppression program stored in the memory through a processor. This ensures that when a blocked H-bridge appears in the multi-active bridge, it can still be under a safe current and voltage, and other unblocked H-bridges in the multi-active bridge can also operate normally, thereby improving the working efficiency and service life of the multi-active bridge.

[0020] To achieve the above objectives, a third aspect of the present invention provides a computer-readable storage medium storing a multi-active bridge lockout boost suppression program, which, when executed by a processor, implements the multi-active bridge lockout boost suppression method according to the above embodiments.

[0021] The computer-readable storage medium of this invention executes a multi-active bridge block-up boost suppression program stored thereon via a processor. This ensures that when a blocked H-bridge appears in the multi-active bridge, it can still operate under a safe current and voltage, and that other unblocked H-bridges in the multi-active bridge can also operate normally, thereby improving the working efficiency and service life of the multi-active bridge.

[0022] To achieve the above objectives, a fourth aspect of the present invention provides another power electronic transformer, which includes a multi-active bridge comprising N H-bridges, wherein N is an integer greater than or equal to 3; a control unit configured to, when a locked H-bridge exists in the multi-active bridge, determine the junction capacitance value of the locked H-bridge, determine the equivalent inductance value between at least one unlocked H-bridge and the locked H-bridge, determine the phase difference between two phase arms of the at least one unlocked H-bridge based on the equivalent inductance value and the junction capacitance value, and perform internal phase shift control on the at least one unlocked H-bridge based on the phase difference between the two phase arms to suppress the port voltage of the locked H-bridge.

[0023] The power electronic transformer of this invention includes a multi-active bridge and a control unit. The multi-active bridge includes three or more H-bridges. When the control unit determines that a blocked H-bridge exists in the multi-active bridge, it further determines the junction capacitance value corresponding to the blocked H-bridge, then determines the equivalent inductance value between any one or more unblocked H-bridges in the multi-active bridge and the blocked H-bridge. Based on the equivalent inductance value and the junction capacitance value, it determines the phase difference between the two-phase arms of each unblocked H-bridge, and performs internal phase shift control on the unblocked H-bridges based on the phase difference to suppress the port voltage corresponding to the blocked H-bridge. Therefore, the power electronic transformer of this invention can ensure that it remains under safe current and voltage when a blocked H-bridge appears in the multi-active bridge, and that other unblocked H-bridges in the multi-active bridge can also operate normally, improving the working efficiency and service life of the multi-active bridge.

[0024] In some embodiments of the present invention, the control unit determines the phase difference between the two bridge arms according to the following formula: in, The phase difference between the two bridge arms is given by C, where L is the equivalent inductance value and C is the phase difference between the two bridge arms. J The value is the junction capacitance.

[0025] In some embodiments of the present invention, the control unit is further configured to: determine the equivalent inductance value between each unblocked H-bridge and the blocked H-bridge; determine the two-phase arm phase difference of each unblocked H-bridge based on the equivalent inductance value between each unblocked H-bridge and the blocked H-bridge and the junction capacitance value; and perform internal phase shift control on the corresponding unblocked H-bridge based on the two-phase arm phase difference of each unblocked H-bridge.

[0026] In some embodiments of the present invention, the control unit is further configured to determine the port voltage phase of each unblocked H-bridge and perform external phase shift control on the corresponding unblocked H-bridge according to the port voltage phase of each unblocked H-bridge.

[0027] In some embodiments of the present invention, the control unit is further configured to, when any one of the unlocked H-bridges is used as the first unlocked H-bridge, set the port voltage phase of the first unlocked H-bridge as a reference value, acquire the port voltage of each unlocked H-bridge, acquire the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges (excluding the first unlocked H-bridge) and the first unlocked H-bridge, acquire the operating frequency of the multiple active bridges, and determine the port voltage phase of the other unlocked H-bridges based on the port voltage of each unlocked H-bridge, the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge, and the operating frequency of the multiple active bridges.

[0028] In some embodiments of the present invention, the control unit determines the port voltage phase of the other unblocked H-bridge according to the following formula: Where k is the port number of the other unblocked H-bridge, P 1,k n represents the transmission power between the other unblocked H-bridges and the first unblocked H-bridge. 1,k L is the isolation transformer turns ratio between the other unlocked H-bridges and the first unlocked H-bridge. 1,k d is the equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge. 1,k Let f be the phase of the port voltage of the other unblocked H-bridges, f be the operating frequency of the multiple active bridges, u1 be the port voltage of the first unblocked H-bridge, and u k The port voltage of the other unblocked H-bridges.

[0029] In some embodiments of the present invention, the reference value is zero.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] Figure 1 This is a circuit diagram of a four-active-bridge circuit in related technologies;

[0032] Figure 2 This is a flowchart of a method for suppressing multi-active bridge blockage boost according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the AC voltage signals for the locked H-bridge and the running H-bridge in a multi-active bridge in related technologies;

[0034] Figure 4 This is a schematic diagram of the AC voltage signal of the locked H-bridge and the running H-bridge after internal phase shift control in a multi-active bridge according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the DC voltage signal of the locked H-bridge in a multi-active bridge according to an embodiment of the present invention;

[0036] Figure 6 This is a flowchart of a method for suppressing multi-active bridge blockage boost according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the internal and external phase shifts of the H-bridge in a multi-active bridge according to an embodiment of the present invention;

[0038] Figure 8 This is a flowchart of a method for suppressing multi-active bridge blockage boost according to an embodiment of the present invention;

[0039] Figure 9 This is a structural block diagram of a power electronic transformer according to an embodiment of the present invention;

[0040] Figure 10 This is a structural block diagram of another power electronic transformer according to an embodiment of the present invention. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0042] The following description, with reference to the accompanying drawings, describes a method for suppressing multi-active bridge block-up boost, a storage medium, and a transformer according to embodiments of the present invention.

[0043] Figure 2 This is a flowchart of a method for suppressing multi-active bridge blockage boost according to an embodiment of the present invention.

[0044] like Figure 2 As shown, this invention proposes a method for suppressing multi-active bridge blockage boost, which includes the following steps:

[0045] S10, when a locked H-bridge exists in a multi-active bridge, determine the junction capacitance value of the locked H-bridge, and determine the equivalent inductance value between at least one unlocked H-bridge and the locked H-bridge.

[0046] Specifically, see Figure 1 In this embodiment, the multiple active bridges can be four active bridges. Each of the four active bridges can transfer power to any of the active bridges in the same pair. For example, the active bridge corresponding to port 1 can transfer power to the active bridges corresponding to ports 2, 3, and 4, and the active bridge corresponding to port 2 can also transfer power to the active bridges corresponding to ports 1, 3, and 4. It should be noted that the active bridges corresponding to each port in this embodiment are H-bridges. Each H-bridge can be composed of switching transistors with the same parameters or switching transistors with different parameters. The junction capacitance value of the switching transistors in each H-bridge can be determined by the parameters of the transistors that make up the H-bridge.

[0047] More specifically, during normal operation, all ports in the four active bridges are in a normally unlocked state. When the pulse of the H-bridge corresponding to a port in the four active bridges is blocked, the other H-bridges that are still in operation will inject energy into the port corresponding to the blocked H-bridge to increase its DC voltage, such as... Figure 3 As shown, the peaks and troughs of the AC signal in the locked H-bridge exhibit high-frequency oscillations, indicating that energy is injected into the locked port. This could potentially affect devices connected to that port or directly impact the operation of the four active bridges. It should be noted that... Figure 3 In this context, u1 can represent the voltage corresponding to port 1, and the H-bridge corresponding to port 1 is an unblocked H-bridge; u2 can represent the voltage corresponding to port 2, and the H-bridge corresponding to port 2 is a blocked H-bridge.

[0048] Therefore, when a locked H-bridge exists in a quad active bridge configuration, the DC voltage at its corresponding port needs to be suppressed. First, the junction capacitance of the locked H-bridge and the equivalent inductance between at least one unlocked H-bridge and the locked H-bridge can be determined. For example, when the H-bridge corresponding to port 1 is pulse-locked, the equivalent inductance between the unlocked H-bridge corresponding to port 2 and the locked H-bridge corresponding to port 1 can be determined. It is understood that since this embodiment only requires determining the equivalent inductance value, it can be directly detected and determined using a detection device. Of course, other methods can also be used, and the determination method is not limited here.

[0049] S20, determine the phase difference between two phase arms of at least one unblocked H-bridge based on the equivalent inductance and junction capacitance values.

[0050] Specifically, after determining the equivalent inductance and junction capacitance values, the phase difference between the two phase arms of the unblocked H-bridge can be determined based on these two parameters. For example, the phase difference between the left and right arms of the unblocked H-bridge corresponding to port 2 can be determined based on the equivalent inductance and junction capacitance values. In this embodiment, the phase difference between the two phase arms can be determined using the following formula: in, The phase difference between the two bridge arms is given by C, where L is the equivalent inductance value and C is the phase difference between the two bridge arms. J This represents the junction capacitance value.

[0051] S30, perform internal phase shift control on at least one unblocked H-bridge based on the phase difference between the two phase arms, so as to suppress the port voltage of the blocked H-bridge.

[0052] Specifically, the phase difference between the two unblocked bridge arms of the H phase is calculated. Then, based on this phase difference, internal phase shift control can be performed on the unlocked H-bridge. More specifically, for example... Figure 4 As shown, given that the equivalent inductance L is 50μH and the junction capacitance is 5nF, the phase difference between the two phase arms of the unblocked H-bridge can be obtained using the above formula. Based on this phase difference, internal phase shift control is performed on the unlocked H-bridge (i.e., the running H-bridge), by... Figure 4 It can be seen that after internal phase-shift control of the running H-bridge, the peaks and troughs of the AC voltage signal of the locked H-bridge no longer exhibit high-frequency oscillations, meaning that no energy is injected into the locked port. More specifically, after internal phase-shift control of the running H-bridge, the DC voltage at the corresponding port of the locked H-bridge is as follows: Figure 5 As shown, the DC voltage no longer increases, but remains at a constant, safe level. It should be noted that... Figure 5 u shown dc2 This represents the DC voltage of the latched H-bridge corresponding to port 2.

[0053] In some embodiments of the present invention, such as Figure 6 As shown, after determining the junction capacitance value of the locked H-bridge, the method further includes the following steps:

[0054] S601, when a locked H-bridge exists in a multi-active bridge, determines the junction capacitance value of the locked H-bridge and the equivalent inductance value between each unlocked H-bridge and the locked H-bridge.

[0055] Specifically, see Figure 1 Taking a four-way active bridge as an example, when one of the H-bridges corresponding to ports 1, 2, 3, and 4 is latched, the junction capacitance value of the latched H-bridge is determined, as well as the equivalent inductance values ​​between the remaining unlatched H-bridges and the latched H-bridge. For example, when the H-bridge corresponding to port 1 is latched, the junction capacitance value of the latched H-bridge corresponding to port 1 is determined, and the equivalent inductance values ​​between the H-bridges corresponding to ports 2, 3, and 4 and the H-bridge of port 1 are also determined. It should be noted that the equivalent inductance value in this embodiment can also be directly determined by detection equipment, or by other methods, as long as the equivalent inductance value can be accurately obtained; no limitation is placed on the determination method here.

[0056] S602, determine the phase difference between the two phase arms of each unblocked H-bridge based on the equivalent inductance value between each unblocked H-bridge and the blocked H-bridge, as well as the junction capacitance value. S603, perform internal phase shift control on the corresponding unblocked H-bridge based on the phase difference between the two phase arms of each unblocked H-bridge.

[0057] Specifically, the method of internal phase-shift control for the unlocked H-bridge in this embodiment can be found in the specific method of internal phase-shift control for at least one unlocked H-bridge in the above embodiments. It should be noted that this embodiment performs internal phase-shift control for all H-bridges except the locked H-bridge in the multi-active bridge configuration. For example, see... Figure 1 and Figure 6 When the H-bridge corresponding to port 1 is a locked H-bridge, and the H-bridges corresponding to ports 2, 3, and 4 are all unlocked H-bridges (i.e., running H-bridges), then internal phase shift control can be performed on the H-bridges corresponding to ports 2, 3, and 4. The internal phase shift control is performed on the H-bridges based on the phase difference between the two phase arms corresponding to each unlocked H-bridge. For example, if the phase difference between the two phase arms corresponding to each unlocked H-bridge is 1.57 microseconds, then the H-bridges corresponding to ports 2, 3, and 4 can be internally phase shifted by 1.57 microseconds respectively, thereby preventing the DC voltage of the locked H-bridge from rising and maintaining it at a constant safety level.

[0058] In this embodiment, when performing internal phase shift control on the corresponding unblocked H-bridge based on the phase difference between the two phase arms of each unblocked H-bridge, the method for suppressing the multi-active bridge blocking boost further includes: determining the port voltage phase of each unblocked H-bridge, and performing external phase shift control on the corresponding unblocked H-bridge based on the port voltage phase of each unblocked H-bridge.

[0059] Specifically, for example, see Figure 1 The H-bridge corresponding to port 1 is a locked H-bridge. When performing internal phase-shift control on the unlocked H-bridges corresponding to ports 2, 3, and 4, the port voltage phase of the unlocked H-bridges corresponding to ports 2, 3, and 4 is also determined, and then external phase-shift control is performed on the corresponding unlocked H-bridges based on this port voltage phase. For example... Figure 7 As shown, H-bridge 1 and H-bridge 2 illustrate the difference between external phase shifting and internal phase shifting of H-bridge. External phase shifting is equivalent to shifting the voltage signal of the entire H-bridge along the x-axis.

[0060] In this embodiment, such as Figure 8 As shown, determining the port voltage phase of each unblocked H-bridge includes the following steps:

[0061] S801, any unblocked H-bridge is selected as the first unblocked H-bridge, and the phase of the port voltage of the first unblocked H-bridge is set as the reference value.

[0062] Specifically, still in Figure 1 If the H-bridge corresponding to port 1 is a locked H-bridge, then the H-bridges corresponding to ports 2, 3 and 4 are unlocked H-bridges. Any one of the unlocked H-bridges is taken as the first unlocked H-bridge, such as the unlocked H-bridge corresponding to port 2. Then, the port voltage phase of the first unlocked H-bridge is set as the reference value. Optionally, the reference value is zero.

[0063] S802, obtain the port voltage of each unblocked H-bridge, and obtain the transmission power, isolation transformer turns ratio, equivalent reactance between the other unblocked H-bridges (excluding the first unblocked H-bridge) and the first unblocked H-bridge, as well as obtain the operating frequency of the multiple active bridges.

[0064] Specifically, after determining the first unblocked H-bridge, the port voltages of the other unblocked H-bridges can be obtained, such as the port voltages of the unblocked H-bridges corresponding to ports 3 and 4. Furthermore, information such as the transmission power, isolation transformer turns ratio, and equivalent reactance between the unblocked H-bridges corresponding to ports 3 and 4 and the first unblocked H-bridge can be obtained. In addition, the operating frequency of the four active bridges can be obtained. It can be understood that the information obtained above is the data information required to calculate the external phase shift.

[0065] S803 determines the phase of the port voltage of other unblocked H-bridges based on the port voltage of each unblocked H-bridge, the transmission power between other unblocked H-bridges and the first unblocked H-bridge, the turns ratio of the isolation transformer, the equivalent reactance, and the operating frequency of the multiple active bridges.

[0066] Specifically, after obtaining information such as the transmission power, isolation transformer turns ratio, and equivalent reactance between the unblocked H-bridges corresponding to ports 3 and 4 and the first unblocked H-bridge, as well as the operating frequency of the four active bridges, the port voltage phase of the corresponding unblocked H-bridge can be calculated according to the specific calculation formula, that is, the port voltage phase corresponding to port 3 and the port voltage phase corresponding to port 4 can be calculated.

[0067] More specifically, the port voltage phases of other unblocked H-bridges are determined according to the following formula: Where k is the port number of the other unblocked H-bridge, P 1,k n represents the transmission power between other unlocked H-bridges and the first unlocked H-bridge. 1,k L is the isolation transformer ratio between the other unlocked H-bridges and the first unlocked H-bridge. 1,k d represents the equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge. 1,k Let f be the phase of the port voltages of the other unblocked H-bridges, f be the operating frequency of the multiple active bridges, and u1 be the port voltage of the first unblocked H-bridge. k For the port voltages of other unblocked H-bridges.

[0068] Taking the calculation of the port voltage phase of the unblocked H-bridge at port 3 as an example, the specific calculation formula is as follows: Among them, P 1,3 n represents the transmission power between the third unblocked H-bridge and the first unblocked H-bridge. 1,3 L represents the turns ratio of the isolation transformer between the third unlocked H-bridge and the first unlocked H-bridge. 1,3 d represents the equivalent reactance between the third unblocked H-bridge and the first unblocked H-bridge. 1,3 Let u1 represent the port voltage phase of the third unblocked H-bridge, f be the operating frequency of the four active bridges, u1 represent the port voltage of the first unblocked H-bridge, and u3 represent the port voltage of the third unblocked H-bridge. It can be understood that in the above formula, the transmission power P between the third unblocked H-bridge and the first unblocked H-bridge... 1,3 The isolation transformer turns ratio n between the third unlocked H-bridge and the first unlocked H-bridge 1,3 The equivalent reactance L between the third unlocked H-bridge and the first unlocked H-bridge 1,3Given that the operating frequency f of the four active H-bridges, the port voltage u1 of the first unblocked H-bridge, and the port voltage u3 of the third unblocked H-bridge are all known quantities, the phase d of the port voltage of the third unblocked H-bridge can be calculated by substituting these parameters into the formula. 1,3 It should be noted that d 1,3 In fact, it can represent the difference between the port voltage phase of the third unblocked H-bridge and the port voltage phase of the first unblocked H-bridge. However, since the port voltage phase of the first unblocked H-bridge is set to a reference value of zero in this embodiment, d can be used in this embodiment. 1,3 This indicates the port voltage phase of the third unblocked H-bridge. In this embodiment, the unblocked H-bridges in the multiple active bridges are controlled by external phase shifting and internal phase shifting, so that the blocked H-bridges will not experience overvoltage, while the unblocked H-bridges can also operate normally.

[0069] In summary, the method for suppressing the blockage boost of the multi-active bridge in this invention can ensure that the current and voltage remain safe when a blocked H-bridge appears in the multi-active bridge, and that other unblocked H-bridges in the multi-active bridge can also operate normally, thereby improving the working efficiency and service life of the multi-active bridge.

[0070] Figure 9 This is a structural block diagram of a power electronic transformer according to an embodiment of the present invention.

[0071] Furthermore, such as Figure 9 As shown, the present invention proposes a power electronic transformer 10, which includes a multi-active bridge (not shown in the figure), a memory 11, a processor 12, and a multi-active bridge blocking boost suppression program stored in the memory 11 and run on the processor 12. When the processor 12 executes the multi-active bridge blocking boost suppression program, it implements the multi-active bridge blocking boost suppression method according to the above embodiment.

[0072] The power electronic transformer of this invention executes a multi-active bridge blocking boost suppression program stored in the memory through a processor. This ensures that when a blocked H-bridge appears in the multi-active bridge, it can still be under a safe current and voltage, and other unblocked H-bridges in the multi-active bridge can also operate normally, thereby improving the working efficiency and service life of the multi-active bridge.

[0073] Furthermore, the present invention proposes a computer-readable storage medium storing a multi-active bridge lock-in boost suppression program, which, when executed by a processor, implements the multi-active bridge lock-in boost suppression method described in the above embodiments.

[0074] The computer-readable storage medium of this invention executes a multi-active bridge block-up boost suppression program stored thereon via a processor. This ensures that when a blocked H-bridge appears in the multi-active bridge, it can still operate under a safe current and voltage, and that other unblocked H-bridges in the multi-active bridge can also operate normally, thereby improving the working efficiency and service life of the multi-active bridge.

[0075] Figure 10 This is a structural block diagram of another power electronic transformer according to an embodiment of the present invention.

[0076] Furthermore, such as Figure 10 As shown, the present invention proposes a power electronic transformer 100, which includes a multi-active bridge 101 and a control unit 102.

[0077] The multi-active bridge 101 includes N H-bridges, where N is an integer greater than or equal to 3. The control unit 102 is used to determine the junction capacitance value of the locked H-bridge and the equivalent inductance value between at least one unlocked H-bridge and the locked H-bridge when a locked H-bridge exists in the multi-active bridge 101. It also determines the phase difference between the two-phase arms of at least one unlocked H-bridge based on the equivalent inductance value and the junction capacitance value, and performs internal phase shift control on at least one unlocked H-bridge based on the phase difference between the two-phase arms to suppress the port voltage of the locked H-bridge.

[0078] In some embodiments of the present invention, the control unit 102 determines the phase difference between the two phase arms according to the following formula: in, The phase difference between the two bridge arms is given by C, where L is the equivalent inductance value and C is the phase difference between the two bridge arms. J This represents the junction capacitance value.

[0079] In some embodiments of the present invention, the control unit 102 is further configured to: determine the equivalent inductance value between each unblocked H-bridge and the blocked H-bridge; determine the phase difference between the two-phase arms of each unblocked H-bridge based on the equivalent inductance value between each unblocked H-bridge and the blocked H-bridge and the junction capacitance value; and perform internal phase shift control on the corresponding unblocked H-bridge based on the phase difference between the two-phase arms of each unblocked H-bridge.

[0080] In some embodiments of the present invention, the control unit 102 is further configured to determine the port voltage phase of each unblocked H-bridge and perform external phase shift control on the corresponding unblocked H-bridge according to the port voltage phase of each unblocked H-bridge.

[0081] In some embodiments of the present invention, the control unit 102 is further configured to, when any one of the unlocked H-bridges is used as the first unlocked H-bridge, set the port voltage phase of the first unlocked H-bridge as a reference value, acquire the port voltage of each unlocked H-bridge, acquire the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges (excluding the first unlocked H-bridge) and the first unlocked H-bridge, acquire the operating frequency of the multiple active bridges, and determine the port voltage phase of the other unlocked H-bridges based on the port voltage of each unlocked H-bridge, the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge, and the operating frequency of the multiple active bridges.

[0082] In some embodiments of the present invention, the control unit 102 determines the port voltage phase of other unblocked H-bridges according to the following formula: Where k is the port number of the other unblocked H-bridge, P 1,k n represents the transmission power between other unlocked H-bridges and the first unlocked H-bridge. 1,k L is the isolation transformer ratio between the other unlocked H-bridges and the first unlocked H-bridge. 1,k d represents the equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge. 1,k Let f be the phase of the port voltages of the other unblocked H-bridges, f be the operating frequency of the multiple active bridges, and u1 be the port voltage of the first unblocked H-bridge. k For the port voltages of other unblocked H-bridges.

[0083] In some embodiments of the present invention, the reference value is zero.

[0084] It should be noted that the specific implementation of the power electronic transformer in the embodiments of the present invention can be found in the specific implementation of the suppression method for multi-active bridge blocking boost in the above embodiments, and will not be repeated here.

[0085] In summary, the power electronic transformer of this invention can ensure that it remains under safe current and voltage when a blocked H-bridge appears in the multi-active bridge, and that other unblocked H-bridges in the multi-active bridge can also operate normally, thereby improving the working efficiency and service life of the multi-active bridge.

[0086] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0087] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0088] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0090] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0091] In this invention, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific implementation.

[0092] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0093] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for suppressing multi-active bridge blockage boost, characterized in that, include: When a locked H-bridge exists in a multi-active bridge, determine the junction capacitance value of the locked H-bridge, and determine the equivalent inductance value between at least one unlocked H-bridge and the locked H-bridge. The phase difference between the two phase arms of the at least one unblocked H-bridge is determined based on the equivalent inductance value and the junction capacitance value. The at least one unblocked H-bridge is subjected to internal phase shift control based on the phase difference between the two phase arms in order to suppress the port voltage of the blocked H-bridge. The method further includes: Determine the port voltage phase of each unblocked H-bridge, and perform external phase shift control on the corresponding unblocked H-bridge based on the port voltage phase of each unblocked H-bridge; Determining the port voltage phase of each unlocked H-bridge includes: setting the port voltage phase of the first unlocked H-bridge as a reference value, where the first unlocked H-bridge is any unlocked H-bridge; acquiring the port voltage of each unlocked H-bridge, and acquiring the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges (excluding the first unlocked H-bridge) and the first unlocked H-bridge, as well as acquiring the operating frequency of the multi-active bridge; and determining the port voltage phase of the other unlocked H-bridges based on the port voltage of each unlocked H-bridge, the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge, and the operating frequency of the multi-active bridge.

2. The method for suppressing multi-active bridge blockage boost according to claim 1, characterized in that, The phase difference between the two bridge arms is determined using the following formula: in, The phase difference between the two bridge arms is... L The equivalent inductance value, C J The value is the junction capacitance.

3. The method for suppressing multi-active bridge blockage boost according to claim 1 or 2, characterized in that, After determining the junction capacitance value of the latched H-bridge, the method further includes: Determine the equivalent inductance value between each unblocked H-bridge and the blocked H-bridge; The phase difference between the two phase arms of each unblocked H-bridge is determined based on the equivalent inductance value between each unblocked H-bridge and the blocked H-bridge, and the junction capacitance value. Internal phase shift control is performed on the corresponding unlocked H-bridge based on the phase difference between the two phase arms of each unlocked H-bridge.

4. The method for suppressing multi-active bridge blockage boost according to claim 1, characterized in that, The port voltage phase of the other unblocked H-bridges is determined using the following formula: in, k The port numbers of the other unblocked H-bridges are given. P 1,k The transmission power between the other unblocked H-bridges and the first unblocked H-bridge. n 1,k The ratio of the isolation transformer between the other unlocked H-bridges and the first unlocked H-bridge. L 1,k The equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge is... d 1,k Let f be the phase of the port voltages of the other unblocked H-bridges, and f be the operating frequency of the multiple active bridges. u 1 represents the port voltage of the first unblocked H-bridge. u k The port voltage of the other unblocked H-bridges.

5. The method for suppressing multi-active bridge blockage boost according to claim 1, characterized in that, The baseline value is zero.

6. A power electronic transformer, comprising multiple active bridges, characterized in that, The power electronic transformer includes a memory, a processor, and a multi-active bridge blockade boost suppression program stored in the memory and running on the processor. When the processor executes the multi-active bridge blockade boost suppression program, it implements the multi-active bridge blockade boost suppression method according to any one of claims 1-5.

7. A computer-readable storage medium, characterized in that, It stores a multi-active bridge lock-up boost suppression program, which, when executed by the processor, implements the multi-active bridge lock-up boost suppression method according to any one of claims 1-5.

8. A power electronic transformer, characterized in that, include: A multi-source bridge, wherein the multi-source bridge comprises N H-bridges, where N is an integer greater than or equal to 3; A control unit is configured to, when a locked H-bridge exists in the multiple active bridges, determine the junction capacitance value of the locked H-bridge, determine the equivalent inductance value between at least one unlocked H-bridge and the locked H-bridge, determine the phase difference between two phase arms of the at least one unlocked H-bridge based on the equivalent inductance value and the junction capacitance value, and perform internal phase shift control on the at least one unlocked H-bridge based on the phase difference between the two phase arms to suppress the port voltage of the locked H-bridge; Determine the port voltage phase of each unblocked H-bridge, and perform external phase shift control on the corresponding unblocked H-bridge based on the port voltage phase of each unblocked H-bridge; The control unit is further configured to, when any one of the unlocked H-bridges is used as the first unlocked H-bridge, set the port voltage phase of the first unlocked H-bridge as a reference value, acquire the port voltage of each unlocked H-bridge, acquire the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges (excluding the first unlocked H-bridge) and the first unlocked H-bridge, acquire the operating frequency of the multi-active bridge, and determine the port voltage phase of the other unlocked H-bridges based on the port voltage of each unlocked H-bridge, the transmission power, isolation transformer turns ratio, and equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge, and the operating frequency of the multi-active bridge.

9. The power electronic transformer according to claim 8, characterized in that, The control unit determines the phase difference between the two bridge arms according to the following formula: in, The phase difference between the two bridge arms is... L The equivalent inductance value, C J The value is the junction capacitance.

10. The power electronic transformer according to claim 8 or 9, characterized in that, The control unit is further configured to: determine the equivalent inductance value between each unblocked H-bridge and the blocked H-bridge; determine the phase difference between the two-phase arms of each unblocked H-bridge based on the equivalent inductance value between each unblocked H-bridge and the blocked H-bridge, and the junction capacitance value; and perform internal phase shift control on the corresponding unblocked H-bridge based on the phase difference between the two-phase arms of each unblocked H-bridge.

11. The power electronic transformer according to claim 8, characterized in that, The control unit determines the port voltage phase of the other unblocked H-bridges according to the following formula: in, k The port numbers of the other unblocked H-bridges are given. P 1,k The transmission power between the other unblocked H-bridges and the first unblocked H-bridge. n 1,k The ratio of the isolation transformer between the other unlocked H-bridges and the first unlocked H-bridge. L 1,k The equivalent reactance between the other unlocked H-bridges and the first unlocked H-bridge is... d 1,k Let f be the phase of the port voltages of the other unblocked H-bridges, and f be the operating frequency of the multiple active bridges. u 1 represents the port voltage of the first unblocked H-bridge. u k The port voltage of the other unblocked H-bridges.

12. The power electronic transformer according to claim 11, characterized in that, The baseline value is zero.

Images