A power distribution control method and system applied to an N-port energy router

Abstract

This application belongs to the field of multi-port energy routers, and specifically relates to a power distribution control method and system applied to N-port energy routers. Controllers are designed for both the grid-side and grid-connected sub-modules, and a power distribution formula is set for the N-port energy router system. Then, switching frequency expressions for the grid-side and grid-connected sub-modules are set separately. Closed-loop control for equal power distribution is achieved through the power distribution formula, ensuring consistency in the switching frequencies of the grid-connected and grid-side sub-modules. The designed power distribution control method for N-port energy routers solves the problem of power mismatch between energy storage devices and power generation units. This control method enables power distribution control even without communication, achieving adaptive power control for each port of the N-port energy router. It can also be extended to other common N-port energy router applications such as microgrids, new energy vehicles, and multi / all-electric aircraft.

Description

Technical Field

[0001] This application belongs to the field of multi-port energy routers, and specifically relates to a power distribution control method and system applied to an N-port energy router. Background Technology

[0002] In recent years, distributed energy storage systems have been widely used in microgrids. Distributed energy storage systems are typically integrated into the microgrid via power converters, which can then convert the voltage of the energy storage system and control its output power. However, in current AC / DC microgrid structures, there is a problem that the industrial standard ratings for the voltage and power of energy storage devices often do not match those of the renewable energy generation units. This situation generally requires an additional converter between the renewable energy and energy storage system devices on the common DC bus to achieve independent control of the power flow of the energy storage system devices. Using the currently widely adopted centralized and decentralized control methods for two-port converters requires multiple power converters to integrate multiple ports; this solution is relatively inefficient and incurs significant economic costs.

[0003] Multiport power routers play a crucial role in power conversion for renewable energy-based microgrids, electric vehicles, and multi-electric aircraft. Therefore, they are often used as power converters between distributed energy storage systems and DC buses. Due to the large number of submodules in a microgrid, the control structure of a multiport power router is relatively complex. Traditional control methods typically employ centralized control, where all measurement information, execution of digital control signals, and generation of gating signals are concentrated in a single processor. While a centralized control architecture allows for more orderly system information response, it places a significant computational burden on the processor. Considering that multiport power routers generally have multiple control objectives, such as output voltage and current regulation and power distribution among submodules, the central processing unit struggles to complete all distributions within each control cycle. As the number of submodules in a multiport power router increases, the demands on the hardware further rise.

[0004] Therefore, how to achieve more efficient power distribution is a problem that needs to be solved. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a power distribution control method and system for an N-port power router, thereby resolving the problem that existing central processing units struggle to effectively regulate output voltage and current and allocate power to sub-modules.

[0006] The technical solution of this application is: a power allocation control method applied to an N-port energy router, comprising:

[0007] The N-port energy router system is divided into a network-side module and a grid-connected module. The network-side module's ports are connected to the lithium battery, and the grid-connected module's ports are connected to the load. Both the network-side module and the grid-connected module include one or more sub-modules, forming a network-side sub-module and a grid-connected sub-module.

[0008] Controllers were designed for the network-side submodule and the grid-connected submodule respectively, and a power allocation formula was set for the N-port energy router system. Then, the switching frequency expressions for the network-side submodule and the grid-connected submodule were set respectively. Closed-loop control with equal power allocation was performed through the power allocation formula, and the switching frequencies of the grid-connected submodule and the network-side submodule were made consistent.

[0009] Preferably, the method for achieving consistency in the switching frequencies of the grid-connected submodule and the grid-building submodule is as follows:

[0010] Obtain the switching frequency, DC side voltage, and number of turns of the transformer winding of the grid-side module port and the grid-connected module port, and calculate the power flow of each port of the multi-port active bridge converter.

[0011] Obtain the rated power of any network-side port, and then calculate the output power of any network-side port based on the input power of each network-side port. ;

[0012] The switching frequency of the full-bridge switching transistors in the network-side module is designed. The expression is given, and the phase difference between the i-th and j-th network-side sub-modules is assumed. The power distribution formula is used to perform closed-loop control on each network-side submodule until the switching frequency of all network-side submodules is consistent.

[0013] The switching frequency of the full-bridge structure switching transistors in the grid-connected side submodule is designed. The expression sets the DC-side voltage reference value vref on the grid-connected submodule, then obtains the nominal DC link voltage and combines it with the power allocation formula to perform closed-loop control of proportional power allocation until the switching frequencies of the grid-connected submodule and the grid-connected submodule are consistent.

[0014] Preferably, the expression for the power flow rate is:

[0015]

[0016] In the formula, fs is the switching frequency; Vi and Vj are the DC side voltages of the submodule ports, respectively; Ni and Nj are the number of turns of the transformer winding;

[0017] Output power The calculation formula is:

[0018]

[0019] In the formula, Rated power of the output port on the network side. This is the sum of the power at all output ports. This is the sum of the rated power of all ports on the network side;

[0020] The power distribution formula is:

[0021] .

[0022] Preferably, the switching frequency of the full-bridge structure switching transistor in the network-side module is... The expression is:

[0023]

[0024] In the formula, fs0 is the nominal switching frequency; is the time constant of the low-pass filter, which is used to reduce high-frequency disturbances in Pdc_i; kp is the proportional gain, and this gain value is the same in all control modules on the grid side.

[0025] Phase difference between the i-th and j-th network side sub-modules The calculation formula is:

[0026] .

[0027] Preferably, the switching frequency of the full-bridge structure switching transistor is... The expression is:

[0028]

[0029] In the above formula, vdc0 is the nominal DC link voltage, fs0 is the nominal switching frequency, and kdc is the proportional control gain.

[0030] Another technical solution of this application is: a power distribution control system for an N-port energy router, including a router function partitioning unit and a router power distribution module;

[0031] The router function partitioning unit is used to divide the N-port energy router system into a network construction side module and a grid connection side module. The network construction side module port is connected to the lithium battery, and the grid connection side module port is connected to the load. Both the network construction side module and the grid connection side module include one or more sub-modules, forming a network construction side sub-module and a grid connection side sub-module.

[0032] The router power allocation module is used to design controllers for the network-side submodule and the grid-connected submodule respectively, and to set the power allocation formula for the N-port energy router system. Then, it sets the switching frequency expressions for the network-side submodule and the grid-connected submodule respectively, and performs closed-loop control for equal power allocation through the power allocation formula, so that the switching frequency of the grid-connected submodule and the network-side submodule is consistent.

[0033] Preferably, the method for ensuring that the switching frequencies of the network-connected side submodule and the network-building side submodule are consistent in the router power allocation module is as follows:

[0034] Obtain the switching frequency, DC side voltage, and number of turns of the transformer winding of the grid-side module port and the grid-connected module port, and calculate the power flow of each port of the multi-port active bridge converter.

[0035] Obtain the rated power of any network-side port, and then calculate the output power of any network-side port based on the input power of each network-side port. ;

[0036] The switching frequency of the full-bridge switching transistors in the network-side module is designed. The expression is given, and the phase difference between the i-th and j-th network-side sub-modules is assumed. The power distribution formula is used to perform closed-loop control on each network-side submodule until the switching frequency of all network-side submodules is consistent.

[0037] The switching frequency of the full-bridge structure switching transistors in the grid-connected side submodule is designed. The expression sets the DC-side voltage reference value vref on the grid-connected submodule, then obtains the nominal DC link voltage and combines it with the power allocation formula to perform closed-loop control of proportional power allocation until the switching frequencies of the grid-connected submodule and the grid-connected submodule are consistent.

[0038] Preferably, in the router power allocation module, the power flow expression is:

[0039]

[0040] In the formula, fs is the switching frequency; Vi and Vj are the DC side voltages of the submodule ports, respectively; Ni and Nj are the number of turns of the transformer winding;

[0041] Output power The calculation formula is:

[0042]

[0043] In the formula, Rated power of the output port on the network side. This is the sum of the power at all output ports. This is the sum of the rated power of all ports on the network side;

[0044] The power distribution formula is:

[0045] .

[0046] Preferably, in the router power distribution module, the switching frequency of the full-bridge structure switch in the network-side module is... The expression is:

[0047]

[0048] In the formula, fs0 is the nominal switching frequency; is the time constant of the low-pass filter, which is used to reduce high-frequency disturbances in Pdc_i; kp is the proportional gain, and this gain value is the same in all control modules on the grid side.

[0049] Phase difference between the i-th and j-th network side sub-modules The calculation formula is:

[0050] .

[0051] Preferably, in the router power distribution module, the switching frequency of the full-bridge structure switching transistor is... The expression is:

[0052]

[0053] In the above formula, vdc0 is the nominal DC link voltage, fs0 is the nominal switching frequency, and kdc is the proportional control.

[0054] This application presents a power distribution control method and system for N-port energy routers. The designed power distribution control method for N-port energy routers solves the problem of power mismatch between energy storage devices and power generation units. This control method enables power distribution control even without communication, achieving adaptive power control for each port of the N-port energy router. It can also be extended to other common applications of N-port energy routers, such as microgrids, new energy vehicles, and multi / all-electric aircraft. Attached Figure Description

[0055] Figure 1 This is a diagram of an N-port energy router system for this application;

[0056] Figure 2 This is a structural diagram of the network-side submodule control system of this application;

[0057] Figure 3 This is a structural diagram of the grid-connected side submodule control system of this application.

[0058] Figure 4 Steady-state waveforms of submodules 1 and 2 with equal power allocation in this application;

[0059] Figure 5 Steady-state waveform diagram of submodule 3 with equal power allocation in this application;

[0060] Figure 6 Steady-state waveforms of submodules 1 and 2 for proportional power allocation in this application;

[0061] Figure 7 Steady-state waveform diagram of submodule 3 for proportional power allocation in this application;

[0062] Figure 8 Dynamic power response diagram for equal power allocation in this application;

[0063] Figure 9 This is a dynamic power response diagram for the proportional power allocation in this application. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0065] The first aspect of this application provides a power distribution control method for an N-port energy router, which can realize adaptive power flow distribution among the ports of the N-port energy router and achieve power distribution control under no communication conditions.

[0066] Includes the following steps:

[0067] Step S100: Establish an N-port energy router system

[0068] The N-port energy router system includes a multi-port active bridge converter, loads connected to the multi-port active bridge converter, and a lithium battery. This N-port energy router system is divided into a network-side module and a grid-connected module. The network-side module's ports are connected to the lithium battery, and the grid-connected module's ports are connected to the load, such as... Figure 1Both the grid-building side module and the grid-connection side module include one or more sub-modules, forming grid-building side sub-modules and grid-connection side sub-modules. The grid-building side sub-module is as follows: Figure 2 As shown, the grid-connected side submodule is as follows Figure 3 As shown.

[0069] In a specific example, a first grid-side submodule, a second grid-side submodule, and a grid-connected submodule are configured. The winding ratio among the first, second, and grid-connected submodules is 1:1:1. The first and second grid-side submodules are powered by a 100V voltage source, and the DC terminal of the grid-connected submodule is connected to a 940μF capacitor and an active load. An RT-Box real-time simulator is used for sampling and digital control. The system parameters are shown in the system and control parameter table.

[0070] System and Control Parameter Table

[0071]

[0072] In step S200, controllers are designed for the network-side submodule and the grid-connected submodule respectively, and a power allocation formula is set for the N-port energy router system. Then, the switching frequency expressions for the network-side submodule and the grid-connected submodule are set respectively. Closed-loop control for equal power allocation is performed through the power allocation formula, and the switching frequencies of the grid-connected submodule and the network-side submodule are consistent.

[0073] Specifically, it includes:

[0074] Step S210: Obtain the switching frequency, DC side voltage, and number of turns of the transformer winding for the grid-connected module ports and the grid-connected module ports. Calculate the power flow at each port of the multi-port active bridge converter. The power flow expression is:

[0075] (1)

[0076] In the formula, fs is the switching frequency; Vi and Vj are the DC side voltages of the submodule ports, respectively; Ni and Nj are the number of turns of the transformer winding.

[0077] Step S220: Obtain the rated power of any network-side port, and then calculate the output power of any network-side port based on the input power of each network-side port. Output power The calculation formula is:

[0078] (2)

[0079] In the formula, Rated power of the output port on the network side. This is the sum of the power at all output ports. This is the sum of the rated power of all ports on the network side.

[0080] Power allocation is performed among the sub-modules on the network side based on the sum of the rated power of all ports. The power allocation formula is as follows:

[0081] (3)

[0082] Step S230: Design the switching frequency of the full-bridge structure switching transistors in the network-side module. The expression is given, and the phase difference between the i-th and j-th network-side sub-modules is assumed. The power distribution formula is used to perform closed-loop control on each network-side submodule until the switching frequency of all network-side submodules is consistent.

[0083] Preferably, the switching frequency of the full-bridge structure switching transistors in the network-side module is... The expression is:

[0084] (4)

[0085] In the formula, fs0 is the nominal switching frequency. is the time constant of the low-pass filter, which is used to reduce high-frequency disturbances in Pdc_i. kp is the proportional gain, and this gain value is the same in all control modules on the grid side. Therefore, under steady-state conditions, the switching frequencies of all converter submodules will tend to be the same.

[0086] Phase difference between the i-th and j-th network side sub-modules The calculation formula is:

[0087] (5)

[0088] When the switching frequency of a certain submodule on the network side is affected less than that of the other submodules, the phase angle of the port voltage of that module will lag behind that of the other modules. This module will absorb more active power. Since Equation (4) specifies a negative correlation between the power of a submodule and its switching frequency, the switching frequency of that submodule will increase while the switching frequencies of the other submodules will decrease. Then, through Equation (5) and equal power distribution, closed-loop control is performed so that the phase angle of that submodule will autonomously approach that of the other submodules until the switching frequencies of all submodules are consistent, and the system enters a steady state.

[0089] Step S240: Design the switching frequency of the full-bridge structure switching transistors for the grid-connected submodule. The expression sets the DC-side voltage reference value vref on the grid-connected submodule, then obtains the nominal DC link voltage and combines it with the power allocation formula to perform closed-loop control of proportional power allocation until the switching frequencies of the grid-connected submodule and the grid-connected submodule are consistent.

[0090] Preferably, the switching frequency of the full-bridge structure switching transistor is... The expression is:

[0091] (6)

[0092] In the above formula, vdc0 is the nominal DC link voltage, fs0 is the nominal switching frequency, and kdc is the proportional control gain. Figure 3 The control strategy in this system links the DC port voltage of the submodule proportionally to the switching frequency. Therefore, the grid-connected submodule can autonomously regulate its DC terminal voltage and maintain synchronization with other submodules.

[0093] In a specific example, a hardware-in-the-loop simulation is performed using RT-Box to verify the instance. Figure 4 , Figure 5 The steady-state waveforms of each submodule under equal power distribution are shown. By setting the capacities of the two grid-side submodules to the same value, the power distribution ratio between the first and second grid-side submodules remains 1:1. Therefore, during system operation, the load power of the grid-side submodules will be equally borne by both the first and second grid-side submodules. It can be observed that iac1 and iac2 are equal to half of iac3 and in opposite directions, indicating that the proposed control strategy can achieve equal power distribution among MAB submodules. Simultaneously, the phase shift between vac1 and vac3 is... The phase shift between vac2 and vac3 is ,and and All values ​​are positive, indicating that active power flows from the first grid-side submodule and #2 to the grid-connected submodule. Furthermore, it can be seen through... = This further verifies that equal power distribution is achieved among the submodules. Similarly, as... Figure 6 , Figure 7 During steady-state operation of the system, the rated capacity ratio of the first grid-side submodule and the second grid-side submodule is 2:1, and the ratio of the control proportional gains m1 and m2 is 1:2. According to the designed control strategy, the load power of the grid-side submodule will be distributed between the first grid-side submodule and the second grid-side submodule in a 2:1 ratio. Figure 8As shown, an interference is applied to increase the load power required by the grid-connected submodule from 200W to 400W, and then the load power is reduced from 400W to 200W to verify the dynamic response of the proposed control strategy. The first and second grid-connected submodules have the same rated power, and the power balance principle ensures that the sum of P1, P2, and P3 is zero. Regardless of the load power change, the power allocation ratio between the first and second grid-connected submodules remains at the expected 1:1. Similarly, an interference is applied and then removed, as shown... Figure 9 As shown, the rated power of the first grid-side submodule is twice that of the second grid-side submodule. Regardless of the change in load power, the power distribution ratio between the first grid-side submodule and #2 remains at the expected 2:1.

[0094] In summary, the power distribution control method designed for N-port energy routers solves the problem of power mismatch between energy storage devices and power generation units. This control method enables power distribution control even without communication, achieving adaptive power control for each port of the N-port energy router. It can also be extended to other common applications of N-port energy routers, such as microgrids, new energy vehicles, and multi / all-electric aircraft.

[0095] As another specific implementation, a power distribution control system applied to an N-port energy router includes a router function partitioning unit and a router power distribution module;

[0096] The router function partitioning unit is used to divide the N-port energy router system into a network construction side module and a grid connection side module. The network construction side module port is connected to the lithium battery, and the grid connection side module port is connected to the load. Both the network construction side module and the grid connection side module include one or more sub-modules, forming a network construction side sub-module and a grid connection side sub-module.

[0097] The router power allocation module is used to design controllers for the network-side submodule and the grid-connected submodule respectively, and to set the power allocation formula for the N-port energy router system. Then, it sets the switching frequency expressions for the network-side submodule and the grid-connected submodule respectively, and performs closed-loop control for equal power allocation through the power allocation formula, so that the switching frequency of the grid-connected submodule and the network-side submodule is consistent.

[0098] Preferably, the method for ensuring that the switching frequencies of the network-connected side submodule and the network-building side submodule are consistent in the router power allocation module is as follows:

[0099] Obtain the switching frequency, DC side voltage, and number of turns of the transformer winding of the grid-side module port and the grid-connected module port, and calculate the power flow of each port of the multi-port active bridge converter.

[0100] Obtain the rated power of any network-side port, and then calculate the output power of any network-side port based on the input power of each network-side port. ;

[0101] The switching frequency of the full-bridge switching transistors in the network-side module is designed. The expression is given, and the phase difference between the i-th and j-th network-side sub-modules is assumed. The power distribution formula is used to perform closed-loop control on each network-side submodule until the switching frequency of all network-side submodules is consistent.

[0102] The switching frequency of the full-bridge structure switching transistors in the grid-connected side submodule is designed. The expression sets the DC-side voltage reference value vref on the grid-connected submodule, then obtains the nominal DC link voltage and combines it with the power allocation formula to perform closed-loop control of proportional power allocation until the switching frequencies of the grid-connected submodule and the grid-connected submodule are consistent.

[0103] Preferably, in the router power allocation module, the power flow expression is:

[0104]

[0105] In the formula, fs is the switching frequency; Vi and Vj are the DC side voltages of the submodule ports, respectively; Ni and Nj are the number of turns of the transformer winding;

[0106] Output power The calculation formula is:

[0107]

[0108] In the formula, Rated power of the output port on the network side. This is the sum of the power at all output ports. This is the sum of the rated power of all ports on the network side;

[0109] The power distribution formula is:

[0110] .

[0111] Preferably, in the router power distribution module, the switching frequency of the full-bridge structure switch in the network-side module is... The expression is:

[0112]

[0113] In the formula, fs0 is the nominal switching frequency; is the time constant of the low-pass filter, which is used to reduce high-frequency disturbances in Pdc_i; kp is the proportional gain, and this gain value is the same in all control modules on the grid side.

[0114] Phase difference between the i-th and j-th network side sub-modules The calculation formula is:

[0115] .

[0116] Preferably, in the router power distribution module, the switching frequency of the full-bridge structure switching transistor is... The expression is:

[0117]

[0118] In the above formula, vdc0 is the nominal DC link voltage, fs0 is the nominal switching frequency, and kdc is the proportional control.

[0119] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power distribution control method applied to an N-port energy router, characterized in that, include: The N-port energy router system is divided into a network-side module and a grid-connected module. The network-side module's ports are connected to the lithium battery, and the grid-connected module's ports are connected to the load. Both the network-side module and the grid-connected module include one or more sub-modules, forming a network-side sub-module and a grid-connected sub-module. Controllers were designed for the network-side submodule and the grid-connected submodule respectively, and a power allocation formula was set for the N-port energy router system. Then, the switching frequency expressions for the network-side submodule and the grid-connected submodule were set respectively. Closed-loop control with equal power allocation was performed through the power allocation formula, and the switching frequencies of the grid-connected submodule and the network-side submodule were made consistent.

2. The power allocation control method applied to an N-port energy router as described in claim 1, characterized in that, The method for achieving the same switching frequency between the grid-connected submodule and the grid-building submodule is as follows: Obtain the switching frequency, DC side voltage, and number of turns of the transformer winding of the grid-side module port and the grid-connected module port, and calculate the power flow of each port of the multi-port active bridge converter. Obtain the rated power of any network-side port, and then calculate the output power of any network-side port based on the input power of each network-side port. ; The switching frequency of the full-bridge switching transistors in the network-side module is designed. The expression is given, and the phase difference between the i-th and j-th network-side sub-modules is assumed. The power distribution formula is used to perform closed-loop control on each network-side submodule until the switching frequency of all network-side submodules is consistent. The switching frequency of the full-bridge structure switching transistors in the grid-connected side submodule is designed. The expression sets the DC-side voltage reference value vref on the grid-connected submodule, then obtains the nominal DC link voltage and combines it with the power allocation formula to perform closed-loop control of proportional power allocation until the switching frequencies of the grid-connected submodule and the grid-connected submodule are consistent.

3. The power allocation control method applied to an N-port energy router as described in claim 2, characterized in that, The expression for the power flow rate is: In the formula, fs is the switching frequency; Vi and Vj are the DC side voltages of the submodule ports, respectively; Ni and Nj are the number of turns of the transformer winding; Output power The calculation formula is: In the formula, Rated power of the output port on the network side. This is the sum of the power at all output ports. This is the sum of the rated power of all ports on the network side; The power distribution formula is: 。 4. The power allocation control method for an N-port energy router as described in claim 3, characterized in that, The switching frequency of the full-bridge structure switch in the network-side module The expression is: In the formula, fs0 is the nominal switching frequency; is the time constant of the low-pass filter, which is used to reduce high-frequency disturbances in Pdc_i; kp is the proportional gain, and this gain value is the same in all control modules on the grid side. Phase difference between the i-th and j-th network side sub-modules The calculation formula is: 。 5. The power allocation control method applied to an N-port energy router as described in claim 4, characterized in that, The switching frequency of the full-bridge structure switch transistor The expression is: In the above formula, vdc0 is the nominal DC link voltage, fs0 is the nominal switching frequency, and kdc is the proportional control.

6. A power distribution control system for an N-port energy router, employing the method described in any one of claims 1-5, characterized in that: This includes a router function partitioning unit and a router power allocation module; The router function partitioning unit is used to divide the N-port energy router system into a network construction side module and a grid connection side module. The network construction side module port is connected to the lithium battery, and the grid connection side module port is connected to the load. Both the network construction side module and the grid connection side module include one or more sub-modules, forming a network construction side sub-module and a grid connection side sub-module. The router power allocation module is used to design controllers for the network-side submodule and the grid-connected submodule respectively, and to set the power allocation formula for the N-port energy router system. Then, it sets the switching frequency expressions for the network-side submodule and the grid-connected submodule respectively, and performs closed-loop control for equal power allocation through the power allocation formula, so that the switching frequency of the grid-connected submodule and the network-side submodule is consistent.

7. The power distribution control system for an N-port energy router as described in claim 6, characterized in that, The method for ensuring that the switching frequencies of the network-connection side submodule and the network-building side submodule are consistent in the router power allocation module is as follows: Obtain the switching frequency, DC side voltage, and number of turns of the transformer winding of the grid-side module port and the grid-connected module port, and calculate the power flow of each port of the multi-port active bridge converter. Obtain the rated power of any network-side port, and then calculate the output power of any network-side port based on the input power of each network-side port. ; The switching frequency of the full-bridge switching transistors in the network-side module is designed. The expression is given, and the phase difference between the i-th and j-th network-side sub-modules is assumed. The power distribution formula is used to perform closed-loop control on each network-side submodule until the switching frequency of all network-side submodules is consistent. The switching frequency of the full-bridge structure switching transistors in the grid-connected side submodule is designed. The expression sets the DC-side voltage reference value vref on the grid-connected submodule, then obtains the nominal DC link voltage and combines it with the power allocation formula to perform closed-loop control of proportional power allocation until the switching frequencies of the grid-connected submodule and the grid-connected submodule are consistent.

8. The power distribution control system for an N-port energy router as described in claim 7, characterized in that, In the router power allocation module, the expression for the power flow is: In the formula, fs is the switching frequency; Vi and Vj are the DC side voltages of the submodule ports, respectively; Ni and Nj are the number of turns of the transformer winding; Output power The calculation formula is: In the formula, Rated power of the output port on the network side. This is the sum of the power at all output ports. This is the sum of the rated power of all ports on the network side; The power distribution formula is: 。 9. The power distribution control system for an N-port energy router as described in claim 8, characterized in that, In the router power allocation module, the switching frequency of the full-bridge structure switch in the network-side module is... The expression is: In the formula, fs0 is the nominal switching frequency; is the time constant of the low-pass filter, which is used to reduce high-frequency disturbances in Pdc_i; kp is the proportional gain, and this gain value is the same in all control modules on the grid side. Phase difference between the i-th and j-th network side sub-modules The calculation formula is: 。 10. The power distribution control system for an N-port energy router as described in claim 9, characterized in that, In the router power distribution module, the switching frequency of the full-bridge structure switch is... The expression is: In the above formula, vdc0 is the nominal DC link voltage, fs0 is the nominal switching frequency, and kdc is the proportional control.

Images