阅读说明：本技术 能量路由器的交流端口及能量路由器 (Alternating current port of energy router and energy router ) 是由 马思源 汪宇 宋超 程磊 龙根 李纵 熊桥坡 罗成 杨淼 邓珊 于 2019-11-05 设计创作，主要内容包括：本公开公开了一种能量路由器的交流端口及能量路由器,属于电能存储领域。包括逆变电路、谐波电流抑制电路和谐波电流控制电路；谐波电流抑制电路包括第一开关器件、第二开关器件、电感和电容,第一开关器件和第二开关器件串联之后与直流母线并联,电感和电容串联之后与第二开关器件并联；谐波电流控制电路包括依次连接的第一减法器、第一比例积分控制器、第一正弦脉宽调制器和第一反相器,第一减法器的两个输入端分别接入谐波电流抑制电路的输入电流、以及谐波电流抑制电路的输入电流中的谐波电流,第一正弦脉宽调制器的输出端与第一开关器件的控制端连接,第一反相器的输出端与第二开关器件的控制端连接。本公开对直流母线无谐波影响。(The utility model discloses an energy router's interchange port and energy router belongs to the electric energy storage field. The harmonic current suppression circuit comprises an inverter circuit, a harmonic current suppression circuit and a harmonic current control circuit; the harmonic current suppression circuit comprises a first switch device, a second switch device, an inductor and a capacitor, wherein the first switch device and the second switch device are connected in series and then connected in parallel with the direct current bus, and the inductor and the capacitor are connected in series and then connected in parallel with the second switch device; the harmonic current control circuit comprises a first subtracter, a first proportional integral controller, a first sine pulse width modulator and a first phase inverter which are sequentially connected, wherein two input ends of the first subtracter are respectively connected with the input current of the harmonic current suppression circuit and the harmonic current in the input current of the harmonic current suppression circuit, the output end of the first sine pulse width modulator is connected with the control end of the first switching device, and the output end of the first phase inverter is connected with the control end of the second switching device. The present disclosure has no harmonic effect on the dc bus.)

1. An alternating current port of an energy router, characterized in that the alternating current port comprises a single-phase inverter module (10), the single-phase inverter module (10) comprising an inverter circuit (11), a harmonic current suppression circuit (12) and a harmonic current control circuit (13); the input end of the inverter circuit (11) is connected with the direct current bus (20), and the output end of the inverter circuit (11) is connected with the three-phase alternating current port (30); the harmonic current suppression circuit (12) comprises a first switching device S1, a second switching device S2, an inductor L and a capacitor C, wherein a first end of the first switching device S1 is connected with the positive pole of the direct current bus (20), a second end of the first switching device S1 is connected with a first end of the second switching device S2, a second end of the second switching device S2 is connected with the negative pole of the direct current bus (20), a first end of the inductor L is connected with a second end of the first switching device S1, a second end of the inductor L is connected with a first end of the capacitor C, and a second end of the capacitor C is connected with a second end of the second switching device S2; the harmonic current control circuit (13) comprises a first subtracter (131), a first proportional integral controller (132), a first sine pulse width modulator (133) and a first inverter (134) which are connected in sequence, wherein two input ends of the first subtracter (131) are respectively connected with an input current of the harmonic current suppression circuit (12) and a harmonic current in the input current of the harmonic current suppression circuit (12), an output end of the first sine pulse width modulator (133) is connected with a control end of the first switching device S1, and an output end of the first inverter (134) is connected with a control end of the second switching device S2.

2. The AC port of claim 1, wherein the inverter circuit (11) includes a third switching device S3, a fourth switching device S4, a fifth switching device S5, and a sixth switching device S6, a first terminal of the third switching device S3 and a first terminal of the fifth switching device S5 are connected to the positive pole of the DC bus (20), a second terminal of the fourth switching device S4 and a second terminal of the sixth switching device S6 are connected to the negative pole of the DC bus (20), a second terminal of the third switching device S3 is connected with a first terminal of the fourth switching device S4, a second terminal of the fifth switching device S5 is connected with a first terminal of the sixth switching device S6, the second terminal of the third switching device S3 and the second terminal of the fifth switching device S5 are connected to the three-phase AC port (30) through a coupling inductor.

3. The AC port of claim 2, wherein the inverter circuit (11) further comprises a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, wherein an anode of the first diode D1 is connected to the second terminal of the third switching device S3, a cathode of the first diode D1 is connected to the first terminal of the third switching device S3, an anode of the second diode D2 is connected to the second terminal of the fourth switching device S4, a cathode of the second diode D2 is connected to the second terminal of the fourth switching device S4, an anode of the third diode D3 is connected to the second terminal of the fifth switching device S5, a cathode of the third diode D3 is connected to the first terminal of the fifth switching device S5, an anode of the fourth diode D4 is connected to the second terminal of the sixth switching device S6, a cathode of the fourth diode D4 is connected to the first terminal of the sixth switching device S6.

4. The AC port of claim 2, wherein the single-phase inverter module (10) further comprises an inverter control circuit (14), the inversion control circuit (14) comprises a second subtracter (141), a second proportional-integral controller (142), a second sine pulse width modulator (143) and a second inverter (144) which are connected in sequence, two input ends of the second subtracter (141) are respectively connected with the output voltage of the single-phase inverter module (10) and the set voltage of the single-phase inverter module (10), an output terminal of the second sinusoidal pulse width modulator (143) is connected with a control terminal of the third switching device S3 and a control terminal of the sixth switching device S6, an output terminal of the second inverter (144) is connected to a control terminal of the fourth switching device S4 and a control terminal of the fifth switching device S5.

5. The AC port according to claim 1, wherein the inverter circuit (11) comprises a seventh switching device S7 and an eighth switching device S8, a first end of the seventh switching device S7 is connected to the positive pole of the DC bus (20), a second end of the eighth switching device S8 is connected to the negative pole of the DC bus (20), and a second end of the seventh switching device S7 is connected to the three-phase AC port (30) through a coupling inductor.

6. The AC port of claim 5, wherein said inverter circuit (11) further comprises a seventh diode D7 and an eighth diode D8, an anode of said seventh diode D7 is connected to said second terminal of said seventh switching device S7, a cathode of said seventh diode D7 is connected to said first terminal of said seventh switching device S7, an anode of said eighth diode D8 is connected to said second terminal of said eighth switching device S8, and a cathode of said eighth diode D8 is connected to said second terminal of said eighth switching device S8.

7. An AC port according to any of claims 1-5 characterized in that the number of single phase inverter modules (10) is three, three single phase inverter modules (10) being connected to three ports of the three phase AC port (30), respectively.

8. An ac port according to claim 7, characterized in that the harmonic current control circuits (13) of three single-phase inverter modules (10) are one and the same.

9. The ac port according to claim 7, characterized in that the inverter circuit (11), the harmonic current suppression circuit (12) and the harmonic current control circuit (13) are integrated in one and the same single-phase inverter module (10).

10. An energy router, characterized in that it comprises an ac port according to any of claims 1 to 9.

Technical Field

The present disclosure relates to the field of electric energy storage, and in particular, to an ac port of an energy router.

Background

With the increasing energy crisis and the increasing requirement for power supply reliability, the multi-energy interconnection technology becomes the focus of research in all countries in the world. Although there is no uniformly accepted definition of the energy internet, the goals of various energy internet concepts are basically consistent, namely, clean substitution of energy production and substitution of energy consumption electric energy are realized, and thus energy sharing and efficient utilization are realized. The energy router can realize the input, output, conversion and storage of different energy carriers, and is a core device of an energy internet. The port of the energy router is used for connecting an energy supply device and an energy utilization device, is composed of a power electronic converter, and has the characteristics of high power density, easiness in realizing modular design, easiness in dismounting and easiness in expanding power supply capacity.

With the development of a direct-current distributed power supply and the access of an energy storage device and a direct-current load, an energy router is generally realized in a direct-current bus mode. The energy router is simple in structure, new energy can be generated, stored and loaded into the bus only through primary conversion, a large number of converters can be saved, expenses can be reduced, loss can be reduced, and reliability can be improved. In the energy router adopting the direct current bus mode, an alternating current port is adopted for connecting an alternating current power supply. And an alternating current inverter based on a three-phase half-bridge inverter circuit is a common alternating current port of an energy router and can be connected to an alternating current power supply such as an alternating current power grid, a diesel generator and wind power generation.

In the course of implementing the present disclosure, the inventors found that the prior art has at least the following problems:

different loads are connected into the energy router adopting the direct current bus mode, and current harmonic waves generated by the loads can enter the direct current bus so as to influence other loads.

Disclosure of Invention

The embodiment of the disclosure provides an alternating current port of an energy router, which can reduce or even prevent current harmonics generated by a load from entering a direct current bus. The technical scheme is as follows:

in a first aspect, the disclosed embodiments provide an ac port of an energy router, the ac port including a single-phase inverter module, the single-phase inverter module including an inverter circuit, a harmonic current suppression circuit, and a harmonic current control circuit; the input end of the inverter circuit is connected with the direct current bus, and the output end of the inverter circuit is connected with the three-phase alternating current port; the harmonic current suppression circuit comprises a first switching device, a second switching device, an inductor and a capacitor, wherein a first end of the first switching device is connected with the anode of the direct current bus, a second end of the first switching device is connected with a first end of the second switching device, a second end of the second switching device is connected with the cathode of the direct current bus, a first end of the inductor is connected with a second end of the first switching device, a second end of the inductor is connected with a first end of the capacitor, and a second end of the capacitor is connected with a second end of the second switching device; the harmonic current control circuit comprises a first subtracter, a first proportional integral controller, a first sine pulse width modulator and a first phase inverter which are sequentially connected, two input ends of the first subtracter are respectively connected into the input current of the harmonic current suppression circuit and the harmonic current in the input current of the harmonic current suppression circuit, the output end of the first sine pulse width modulator is connected with the control end of the first switching device, and the output end of the first phase inverter is connected with the control end of the second switching device.

In a possible implementation manner of the embodiment of the present disclosure, the inverter circuit includes a third switching device, a fourth switching device, a fifth switching device, and a sixth switching device, a first end of the third switching device and a first end of the fifth switching device are connected to an anode of the dc bus, a second end of the fourth switching device and a second end of the sixth switching device are connected to a cathode of the dc bus, a second end of the third switching device is connected to a first end of the fourth switching device, a second end of the fifth switching device is connected to a first end of the sixth switching device, and a second end of the third switching device and a second end of the fifth switching device are connected to the three-phase ac port through a coupling inductor.

Optionally, the inverter circuit further includes a first diode, a second diode, a third diode and a fourth diode, the anode of the first diode is connected to the second end of the third switching device, the cathode of the first diode is connected to the first end of the third switching device, the anode of the second diode is connected to the second end of the fourth switching device, the cathode of the second diode is connected to the second end of the fourth switching device, the anode of the third diode is connected to the second end of the fifth switching device, the cathode of the third diode is connected to the first end of the fifth switching device, the anode of the fourth diode is connected to the second end of the sixth switching device, and the cathode of the fourth diode is connected to the first end of the sixth switching device.

Optionally, the single-phase inverter module further includes an inverter control circuit, the inverter control circuit includes a second subtractor, a second proportional-integral controller, a second sine pulse width modulator, and a second inverter, which are connected in sequence, two input ends of the second subtractor are respectively connected to the output voltage of the single-phase inverter module and the set voltage of the single-phase inverter module, an output end of the second sine pulse width modulator is connected to the control end of the third switching device and the control end of the sixth switching device, and an output end of the second inverter is connected to the control end of the fourth switching device and the control end of the fifth switching device.

In another possible implementation manner of the embodiment of the present disclosure, the inverter circuit includes a seventh switching device and an eighth switching device, a first end of the seventh switching device is connected to the positive electrode of the dc bus, a second end of the eighth switching device is connected to the negative electrode of the dc bus, and a second end of the seventh switching device is connected to the three-phase ac port through a coupling inductor.

Optionally, the inverter circuit further includes a seventh diode and an eighth diode, an anode of the seventh diode is connected to the second end of the seventh switching device, a cathode of the seventh diode is connected to the first end of the seventh switching device, an anode of the eighth diode is connected to the second end of the eighth switching device, and a cathode of the eighth diode is connected to the second end of the eighth switching device.

Optionally, the number of the single-phase inverter modules is three, and three single-phase inverter modules are respectively connected with three ports of the three-phase alternating-current port.

Furthermore, the harmonic current control circuits of the three single-phase inverter modules are the same.

Furthermore, an inverter circuit, a harmonic current suppression circuit and a harmonic current control circuit in the same single-phase inverter module are integrated together.

In a second aspect, the disclosed embodiments provide an energy router comprising an ac port as provided in the first aspect.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

the input current of the harmonic current control circuit and the harmonic current in the input current are respectively input into the subtracter for comparison, the proportional-integral controller is used for carrying out proportional integral on a comparison result, and the proportional-integral result is input into the first sine pulse width modulator, so that a corresponding control signal can be output. Based on the sine pulse width modulation principle, the first switching device and the second switching device can obtain the desired harmonic current under the action of the control signal, namely, the harmonic current in the input current is led into a branch where the first switching device and the second switching device are located, and then a filter is formed by an inductor and a capacitor in the harmonic current suppression circuit to process, so that the current harmonic generated by the load is effectively suppressed, and the current harmonic is prevented from entering a direct current bus to influence other loads. Because the harmonic current suppression circuit composed of the first switch device, the second switch device, the inductor and the capacitor carries out targeted processing on the harmonic current in the input current of the unidirectional inverter module, a good filtering effect can be achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an ac port of an energy router provided in an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a harmonic current control circuit provided in an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an inverter control circuit provided in the embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an inverter circuit provided in the embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

The embodiment of the disclosure provides an alternating current port of an energy router. Fig. 1 is a schematic structural diagram of an ac port of an energy router according to an embodiment of the present disclosure. Referring to fig. 1, the ac port includes a single-phase inverter module 10, and the single-phase inverter module 10 includes an inverter circuit 11, a harmonic current suppression circuit 12, and a harmonic current control circuit. The input end of the inverter circuit 11 is connected to the dc bus 20, and the output end of the inverter circuit 11 is connected to the three-phase ac port 30. The harmonic current suppression circuit 12 includes a first switching device S1, a second switching device S2, an inductor L, and a capacitor C, wherein a first terminal of the first switching device S1 is connected to the positive electrode of the dc bus 20, a second terminal of the first switching device S1 is connected to a first terminal of the second switching device S2, a second terminal of the second switching device S2 is connected to the negative electrode of the dc bus 20, a first terminal of the inductor L is connected to a second terminal of the first switching device S1, a second terminal of the inductor L is connected to a first terminal of the capacitor C, and a second terminal of the capacitor C is connected to a second terminal of the second switching device S2.

Fig. 2 is a schematic structural diagram of a harmonic current control circuit according to an embodiment of the disclosure. Referring to fig. 2, the harmonic current control circuit 13 includes a first subtractor 131, a first Proportional Integral (PI) controller 132, a first Sinusoidal Pulse Width Modulation (SPWM) unit 133, and a first inverter 134, which are sequentially connected to each other, where two input ends of the first subtractor 131 are respectively connected to the input current of the harmonic current suppression circuit 12 and the harmonic current in the input current of the harmonic current suppression circuit 12, an output end of the first sinusoidal pulse width modulator 133 is connected to a control end of a first switching device S1, and an output end of the first inverter 134 is connected to a control end of a second switching device S2.

As shown in fig. 1 and 2, the input current of the harmonic current suppression circuit 12 is I_fTo 1, pair_fFourier transform is carried out to obtain harmonic current I_f1sin(w₁t+θ_f1)、I_f2sin(w₂t+θ_f2)、……、I_fnsin(w_nt+θ_fn). All harmonic currents and input currents are respectively input into a first subtracter 131 for subtraction, then the subtraction result is input into a first proportional integral controller 132 for proportional integral, and finally the proportional integral result is input into a first sine pulse width modulator 133, so that the harmonic current and the input current are obtainedA control signal for the switching device. The first inverter 134 inverts the control signal such that the first switching device S1 and the second switching device S2 are alternately turned on.

In practical applications, the input current of the harmonic current suppression circuit 12 may be detected by a current sensor (e.g., a hall current sensor), and after the current sensor detects the input current of the harmonic current suppression circuit 12, the input current is input to the first subtractor 131 for comparison, and is input to the spectrum analyzer for determining the harmonic current of the input current, and then based on the determined harmonic current, the signal generator generates a corresponding harmonic current and inputs the harmonic current to the first subtractor 131 for comparison.

According to the embodiment of the disclosure, the input current of the harmonic current suppression circuit and the harmonic current in the input current are respectively input into the subtracter for comparison, the proportional-integral controller is used for performing proportional integral on a comparison result, and the proportional-integral result is input into the first sine pulse width modulator, so that a corresponding control signal can be output. Based on the sine pulse width modulation principle, the first switching device and the second switching device can obtain the desired harmonic current under the action of the control signal, namely, the harmonic current in the input current is led into a branch where the first switching device and the second switching device are located, and then a filter is formed by an inductor and a capacitor in the harmonic current suppression circuit to process, so that the current harmonic generated by the load is effectively suppressed, and the current harmonic is prevented from entering a direct current bus to influence other loads. Because the harmonic current suppression circuit composed of the first switch device, the second switch device, the inductor and the capacitor carries out targeted processing on the harmonic current in the input current of the unidirectional inverter module, a good filtering effect can be achieved.

In a first implementation manner of the embodiment of the present disclosure, as shown in fig. 1, the inverter circuit 11 may include a third switching device S3, a fourth switching device S4, a fifth switching device S5, and a sixth switching device S6, a first end of the third switching device S3 and a first end of the fifth switching device S5 are connected to the positive electrode of the dc bus 20, a second end of the fourth switching device S4 and a second end of the sixth switching device S6 are connected to the negative electrode of the dc bus 20, a second end of the third switching device S3 is connected to a first end of the fourth switching device S4, a second end of the fifth switching device S5 is connected to a first end of the sixth switching device S6, and a second end of the third switching device S3 and a second end of the fifth switching device S5 are connected to the three-phase ac port 30 through coupling inductors.

Further, as shown in fig. 1, the inverter circuit 11 may further include a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, wherein an anode of the first diode D1 is connected to a second end of the third switching device S3, a cathode of the first diode D1 is connected to a first end of the third switching device S3, an anode of the second diode D2 is connected to a second end of the fourth switching device S4, a cathode of the second diode D2 is connected to a second end of the fourth switching device S4, an anode of the third diode D3 is connected to a second end of the fifth switching device S5, a cathode of the third diode D3 is connected to a first end of the fifth switching device S5, an anode of the fourth diode D4 is connected to a second end of the sixth switching device S6, and a cathode of the fourth diode D4 is connected to a first end of the sixth switching device S6.

The diode is reversely connected with the switching device in parallel, so that high voltage borne by the switching device when the switching device is cut off can be released, the follow current effect is achieved, and the switching device is prevented from being damaged.

Optionally, the harmonic current suppression circuit 12 may further include a fifth diode D5 and a sixth diode D6, an anode of the fifth diode D5 is connected to the second terminal of the first switching device S1, a cathode of the fifth diode D5 is connected to the first terminal of the first switching device S1, an anode of the sixth diode D6 is connected to the second terminal of the second switching device S2, and a cathode of the sixth diode D6 is connected to the second terminal of the second switching device S2.

The diode is reversely connected with the switching device in parallel, so that high voltage borne by the switching device when the switching device is cut off can be released, the follow current effect is achieved, and the switching device is prevented from being damaged.

Optionally, the single-phase inverter module 10 may further include an inverter control circuit. Fig. 3 is a schematic structural diagram of an inverter control circuit according to an embodiment of the present disclosure. Referring to fig. 3, the inverter control circuit 14 includes a second subtractor 141, a second proportional-integral controller 142, a second sinusoidal pulse width modulator 143, and a second inverter 144, which are connected in sequence, wherein two input terminals of the second subtractor 141 are respectively connected to the output voltage of the single-phase inverter module 10 and the set voltage of the single-phase inverter module 10, an output terminal of the second sinusoidal pulse width modulator 143 is connected to the control terminal of the third switching device S3 and the control terminal of the sixth switching device S6, and an output terminal of the second inverter 144 is connected to the control terminal of the fourth switching device S4 and the control terminal of the fifth switching device S5.

As shown in fig. 1 and 3, the output voltage of the single-phase inverter module 10 is u, and the set voltage of the single-phase inverter module 10 is Usin (wt + θ). The set voltage of the single-phase inverter module 10 is Usin (wt + theta) and the output voltage u of the single-phase inverter module 10 are respectively input to the second subtractor 141, the subtraction result is input to the second proportional-integral controller 142 for proportional integration, and finally the proportional-integral result is input to the second sinusoidal pulse width modulator 143, so that the control signal of the switching device can be obtained. The second inverter 144 inverts the control signal such that the third switching device S3 and the fourth switching device S4 are alternately turned on and the fifth switching device S5 and the sixth switching device S6 are alternately turned on.

In practical applications, the output voltage of the single-phase inverter module 10 can be detected by a voltage sensor (e.g., a hall voltage sensor), and the set voltage of the single-phase inverter module 10 can be directly generated by the signal generator.

Fig. 4 is a schematic structural diagram of an inverter circuit provided in the embodiment of the present disclosure. Referring to fig. 4, in a second implementation manner of the embodiment of the present disclosure, the inverter circuit 11 may include a seventh switching device S7 and an eighth switching device S8, a first end of the seventh switching device S7 is connected to the positive electrode of the dc bus 20, a second end of the eighth switching device S8 is connected to the negative electrode of the dc bus 20, and a second end of the seventh switching device S7 is connected to the three-phase ac port 30 through a coupling inductor.

Optionally, the inverter circuit 11 may further include a seventh diode D7 and an eighth diode D8, an anode of the seventh diode D7 is connected to the second end of the seventh switching device S7, a cathode of the seventh diode D7 is connected to the first end of the seventh switching device S7, an anode of the eighth diode D8 is connected to the second end of the eighth switching device S8, and a cathode of the eighth diode D8 is connected to the second end of the eighth switching device S8.

The diode is reversely connected with the switching device in parallel, so that high voltage borne by the switching device when the switching device is cut off can be released, the follow current effect is achieved, and the switching device is prevented from being damaged.

Optionally, the single-phase inverter module 10 in the second implementation may also include the inverter control circuit in the first implementation. The inverter control circuit in the second implementation has the same internal structure as that of the inverter control circuit in the first implementation, except that the output terminal of the second sinusoidal pulse width modulator 143 is connected to the control terminal of the seventh switching device S7, and the output terminal of the second inverter 144 is connected to the control terminal of the eighth switching device S8, so that the seventh switching device S7 and the eighth switching device S8 are alternately turned on.

Alternatively, as shown in fig. 1, the number of the single-phase inverter modules 10 may be three, and three single-phase inverter modules 10 are respectively connected to three ports of the three-phase ac port 30. Three unidirectional inverter modules are combined to generate three-phase alternating current.

In practical applications, when three single-phase inverter modules 10 are used to generate three-phase ac power, the set voltages of the three single-phase inverter modules 10 are different by 120 ° from each other. Namely, the output voltages of the three single-phase inverter modules 10 are respectively:

wherein u is_a、u_b、u_cOutput voltage of single-phase inverter module, omega power grid voltage frequency, U_a、U_b、U_cAmplitude and U of output voltage of single-phase inverter module respectively_a＝U_b＝U_c，θ_a、θ_b、θ_cThe phases of the output voltages of the single-phase inverter modules are different by 120 degrees between every two inverter modules, and U is formed_dcThe voltage value of the direct current bus is shown.

The fundamental wave amplitude of the output voltage of the single-phase inverter module in the first implementation manner and the voltage relation of the direct-current bus are as follows:

U_m＝mU_dc； (2)

wherein, U_mFundamental amplitude, U, of the output voltage of a single-phase inverter module_m＝U_a＝U_b＝U_cM is modulation depth and satisfies m is less than or equal to 1, U_dcIs the voltage of the dc bus.

The output voltage fundamental wave amplitude of the single-phase inverter module and the direct-current bus voltage of the second implementation mode have the following relation:

wherein, U_mFundamental amplitude, U, of the output voltage of a single-phase inverter module_m＝U_a＝U_b＝U_cM is modulation depth and satisfies m is less than or equal to 1, U_dcIs the voltage of the dc bus.

Therefore, under the same modulation depth and the same dc bus voltage, the output voltage of the inverter circuit 11 in the first implementation is twice that in the second implementation, and the three-phase ac port has higher power capacity.

In one implementation of the disclosed embodiment, the harmonic current control circuits 13 of the three single-phase inverter modules 10 may be the same. The circuit is realized by the same circuit, so that the realization cost can be reduced.

In another implementation manner of the disclosed embodiment, the inverter circuit 11, the harmonic current suppression circuit 12, and the harmonic current control circuit 13 in the same single-phase inverter module 10 may be integrated together. And modular design is realized through integration.

The disclosed embodiment provides an energy router, which comprises an alternating current port shown in fig. 1.

The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.