AC port of energy router and energy router

Abstract

The present disclosure discloses an AC port of an energy router and an energy router, belonging to the field of electric energy storage. It includes an inverter circuit, a harmonic current suppression circuit and a harmonic current control circuit; the harmonic current suppression circuit includes a first switch device, a second switch device, an inductor and a capacitor, the first switch device and the second switch device are connected in series and then connected in parallel with the DC 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 includes a first subtractor, a first proportional integral controller, a first sinusoidal pulse width modulator and a first inverter connected in sequence, the two input ends of the first subtractor are respectively connected to 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 sinusoidal pulse width modulator is connected to the control end of the first switch device, and the output end of the first inverter is connected to the control end of the second switch device. The present disclosure has no harmonic impact on the DC bus.

Description

Technical Field

[0001] The present disclosure relates to the field of electric energy storage, and in particular to an AC port of an energy router. Background Art

[0002] With the increasingly serious energy crisis and the increasing requirements for power supply reliability, multi-energy interconnection technology has become the research focus of countries around the world. Although there is no unified and recognized definition of energy Internet, the goals of various energy Internet concepts are basically the same, that is, to achieve clean substitution of energy production and electric energy substitution of energy consumption, so as to achieve energy sharing and efficient utilization. Energy routers can realize the input, output, conversion and storage of different energy carriers, and are the core devices of energy Internet. The ports of energy routers are used for the access of energy supply devices and energy consumption devices. They are composed of power electronic converters, with high power density, easy modular design, easy disassembly and assembly, and easy expansion of power supply capacity.

[0003] With the development of DC distributed power sources, as well as the access of energy storage devices and DC loads, energy routers are generally implemented using a DC bus. This type of energy router has a simple structure, and new energy generation, energy storage, and loads can be incorporated into the bus with only one level of conversion, which can save a large number of converters, reduce costs, reduce losses, and improve reliability. In energy routers that use a DC bus, AC power is accessed using an AC port. The AC inverter based on a three-phase half-bridge inverter circuit is a commonly used AC port for energy routers, which can be connected to AC power grids, diesel generators, wind power generation, and other AC power sources.

[0004] In the process of implementing the present disclosure, the inventors found that the prior art has at least the following problems:

[0005] Different loads are connected to the energy router using the DC bus mode, and the current harmonics generated by the loads will enter the DC bus and affect other loads. Summary of the invention

[0006] The embodiment of the present disclosure provides an AC port of an energy router, which can reduce or even prevent the current harmonics generated by the load from entering the DC bus. The technical solution is as follows:

[0007] In a first aspect, an embodiment of the present disclosure provides an AC port of an energy router, wherein the AC port includes a single-phase inverter module, wherein the single-phase inverter module includes an inverter circuit, a harmonic current suppression circuit, and a harmonic current control circuit; the input end of the inverter circuit is connected to a DC bus, and the output end of the inverter circuit is connected to a three-phase AC port; the harmonic current suppression circuit includes a first switching device, a second switching device, an inductor, and a capacitor, wherein a first end of the first switching device is connected to a positive electrode of the DC bus, a second end of the first switching device is connected to a first end of the second switching device, a second end of the second switching device is connected to a negative electrode of the DC bus, and the inductor is connected to a capacitor. The first end of the inductor is connected to the second end of the first switching device, the second end of the inductor is connected to the first end of the capacitor, and the second end of the capacitor is connected to the second end of the second switching device; the harmonic current control circuit includes a first subtractor, a first proportional integral controller, a first sinusoidal pulse width modulator and a first inverter which are connected in sequence, two input ends of the first subtractor are respectively connected to 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 sinusoidal pulse width modulator is connected to the control end of the first switching device, and the output end of the first inverter is connected to the control end of the second switching device.

[0008] In a possible implementation 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, the first end of the third switching device and the first end of the fifth switching device are connected to the positive pole of the DC bus, the second end of the fourth switching device and the second end of the sixth switching device are connected to the negative pole of the DC bus, the second end of the third switching device is connected to the first end of the fourth switching device, the second end of the fifth switching device is connected to the first end of the sixth switching device, and the second end of the third switching device and the second end of the fifth switching device are connected to the three-phase AC port through a coupling inductor.

[0009] Optionally, the inverter circuit also 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.

[0010] Optionally, the single-phase inverter module also includes an inverter control circuit, which includes a second subtractor, a second proportional-integral controller, a second sinusoidal pulse width modulator and a second inverter connected in sequence, the 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, the output end of the second sinusoidal pulse width modulator is connected to the control end of the third switching device and the control end of the sixth switching device, and the 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.

[0011] In another possible implementation 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 pole of the DC bus, a second end of the eighth switching device is connected to the negative pole of the DC bus, and a second end of the seventh switching device is connected to the three-phase AC port via a coupled inductor.

[0012] Optionally, the inverter circuit also includes a seventh diode and an eighth diode, the anode of the seventh diode is connected to the second end of the seventh switching device, the cathode of the seventh diode is connected to the first end of the seventh switching device, the anode of the eighth diode is connected to the second end of the eighth switching device, and the cathode of the eighth diode is connected to the second end of the eighth switching device.

[0013] Optionally, the number of the single-phase inverter modules is three, and the three single-phase inverter modules are respectively connected to three ports of the three-phase AC port.

[0014] Furthermore, the harmonic current control circuit of the three single-phase inverter modules is the same.

[0015] Furthermore, the inverter circuit, the harmonic current suppression circuit and the harmonic current control circuit are integrated together in the same single-phase inverter module.

[0016] In a second aspect, an embodiment of the present disclosure provides an energy router, wherein the energy router includes an AC port as provided in the first aspect.

[0017] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects:

[0018] By inputting the input current of the harmonic current control circuit and the harmonic current in the input current into the subtractor for comparison, using the proportional integral controller to perform proportional integration on the comparison result, and inputting the proportional integration result into the first sinusoidal pulse width modulator, the corresponding control signal can be output. Based on the principle of sinusoidal pulse width modulation, the first switch device and the second switch device can obtain the desired harmonic current under the action of the control signal, which is equivalent to introducing the harmonic current in the input current into the branch where the first switch device and the second switch device are located, and then the inductor and capacitor in the harmonic current suppression circuit form a filter for processing, thereby effectively suppressing the current harmonics generated by the load and preventing the current harmonics from entering the DC bus and affecting other loads. Since the harmonic current suppression circuit composed of the first switch device, the second switch device, the inductor and the capacitor performs targeted processing on the harmonic current in the input current of the unidirectional inverter module, a good filtering effect can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a structural schematic diagram of an AC port of an energy router provided by an embodiment of the present disclosure;

[0021] Figure 2 is a schematic diagram of the structure of a harmonic current control circuit provided by an embodiment of the present disclosure;

[0022] Figure 3 is a structural schematic diagram of an inverter control circuit provided by an embodiment of the present disclosure;

[0023] Figure 4 It is a structural schematic diagram of the inverter circuit provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0025] An embodiment of the present disclosure provides an AC port of an energy router. Figure 1 A schematic diagram of the structure of an AC port of an energy router provided in an embodiment of the present disclosure. Figure 1The 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 switch device S1, a second switch device S2, an inductor L and a capacitor C. The first end of the first switch device S1 is connected to the positive electrode of the DC bus 20, the second end of the first switch device S1 is connected to the first end of the second switch device S2, the second end of the second switch device S2 is connected to the negative electrode of the DC bus 20, the first end of the inductor L is connected to the second end of the first switch device S1, the second end of the inductor L is connected to the first end of the capacitor C, and the second end of the capacitor C is connected to the second end of the second switch device S2.

[0026] Figure 2 This is a schematic diagram of the structure of the harmonic current control circuit provided by the embodiment of the present disclosure. Figure 2 The harmonic current control circuit 13 includes a first subtractor 131, a first proportional integral (PI) controller 132, a first sinusoidal pulse width modulator (SPWM) 133 and a first inverter 134 which are connected in sequence. The 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. The output end of the first sinusoidal pulse width modulator 133 is connected to the control end of the first switch device S1, and the output end of the first inverter 134 is connected to the control end of the second switch device S2.

[0027] like Figure 1 and Figure 2 As shown, the input current of the harmonic current suppression circuit 12 is I f , to I f Perform Fourier transform to obtain the harmonic current I f1 sin(w1t+θ f1 ), I f2 sin(w2t+θ f2 ),……,I fn sin(w n t+θ fn ). All harmonic currents and input currents are respectively input to the first subtractor 131 for subtraction, and the subtraction result is input to the first proportional integral controller 132 for proportional integration, and finally the proportional integration result is input to the first sinusoidal pulse width modulator 133 to obtain the control signal of the switch device. The first inverter 134 inverts the control signal so that the first switch device S1 and the second switch device S2 are alternately turned on.

[0028] In practical applications, the input current of the harmonic current suppression circuit 12 can be detected by a current sensor (such as a Hall current sensor). After the current sensor detects the input current of the harmonic current suppression circuit 12, it is input into the first subtractor 131 for comparison on the one hand, and is first input into a spectrum analyzer to determine the harmonic current of the input current on the other hand, and then based on the determined harmonic current, a signal generator is used to generate the corresponding harmonic current, and the harmonic current is input into the first subtractor 131 for comparison.

[0029] The disclosed embodiment of the present invention can output a corresponding control signal by respectively inputting the input current of the harmonic current suppression circuit and the harmonic current in the input current into a subtractor for comparison, using a proportional-integral controller to proportionally integrate the comparison result, and inputting the proportional-integral result into the first sinusoidal pulse width modulator. Based on the principle of sinusoidal pulse width modulation, the first switch device and the second switch device can obtain the desired harmonic current under the action of the control signal, which is equivalent to introducing the harmonic current in the input current into the branch where the first switch device and the second switch device are located, and then the inductor and capacitor in the harmonic current suppression circuit form a filter for processing, thereby effectively suppressing the current harmonics generated by the load and preventing the current harmonics from entering the DC bus and affecting other loads. Since the harmonic current suppression circuit composed of the first switch device, the second switch device, the inductor and the capacitor performs targeted processing on the harmonic current in the input current of the unidirectional inverter module, a good filtering effect can be achieved.

[0030] In a first implementation of the embodiment of the present disclosure, as Figure 1 As shown, 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, the first end of the third switching device S3 and the first end of the fifth switching device S5 are connected to the positive electrode of the DC bus 20, the second end of the fourth switching device S4 and the second end of the sixth switching device S6 are connected to the negative electrode of the DC bus 20, the second end of the third switching device S3 is connected to the first end of the fourth switching device S4, the second end of the fifth switching device S5 is connected to the first end of the sixth switching device S6, and the second end of the third switching device S3 and the second end of the fifth switching device S5 are connected to the three-phase AC port 30 through a coupling inductor.

[0031] Furthermore, if Figure 1As shown, the inverter circuit 11 may also include a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, wherein the anode of the first diode D1 is connected to the second end of the third switching device S3, the cathode of the first diode D1 is connected to the first end of the third switching device S3, the anode of the second diode D2 is connected to the second end of the fourth switching device S4, the cathode of the second diode D2 is connected to the second end of the fourth switching device S4, the anode of the third diode D3 is connected to the second end of the fifth switching device S5, the cathode of the third diode D3 is connected to the first end of the fifth switching device S5, the anode of the fourth diode D4 is connected to the second end of the sixth switching device S6, and the cathode of the fourth diode D4 is connected to the first end of the sixth switching device S6.

[0032] By connecting the diode in reverse parallel with the switching device, the high voltage that the switching device is subjected to when it is cut off can be released, playing a role of freewheeling and avoiding damage to the switching device.

[0033] Optionally, the harmonic current suppression circuit 12 may further include a fifth diode D5 and a sixth diode D6, wherein the anode of the fifth diode D5 is connected to the second end of the first switching device S1, the cathode of the fifth diode D5 is connected to the first end of the first switching device S1, the anode of the sixth diode D6 is connected to the second end of the second switching device S2, and the cathode of the sixth diode D6 is connected to the second end of the second switching device S2.

[0034] By connecting the diode in reverse parallel with the switching device, the high voltage that the switching device is subjected to when it is cut off can be released, playing a role of freewheeling and avoiding damage to the switching device.

[0035] Optionally, the single-phase inverter module 10 may further include an inverter control circuit. Figure 3 This is a schematic diagram of the structure of the inverter control circuit provided by the embodiment of the present disclosure. Figure 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. The two input ends 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. The output end of the second sinusoidal pulse width modulator 143 is connected to the control end of the third switch device S3 and the control end of the sixth switch device S6. The output end of the second inverter 144 is connected to the control end of the fourth switch device S4 and the control end of the fifth switch device S5.

[0036] like Figure 1 and Figure 3As shown, 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+θ) and the output voltage u of the single-phase inverter module 10 are respectively input into the second subtractor 141, and then the subtraction result is input into the second proportional integral controller 142 for proportional integration, and finally the proportional integration result is input into the second sinusoidal pulse width modulator 143, so as to obtain the control signal of the switch device. The second inverter 144 inverts the control signal, so that the third switch device S3 and the fourth switch device S4 are alternately turned on, and the fifth switch device S5 and the sixth switch device S6 are alternately turned on.

[0037] In practical applications, the output voltage of the single-phase inverter module 10 can be detected by a voltage sensor (such as a Hall voltage sensor), and the set voltage of the single-phase inverter module 10 can be directly generated by a signal generator.

[0038] Figure 4 This is a schematic diagram of the structure of the inverter circuit provided by the embodiment of the present disclosure. Figure 4 In a second implementation of the embodiment of the present disclosure, the inverter circuit 11 may include a seventh switching device S7 and an eighth switching device S8, wherein 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 via a coupling inductor.

[0039] Optionally, the inverter circuit 11 may also include a seventh diode D7 and an eighth diode D8, the anode of the seventh diode D7 is connected to the second end of the seventh switching device S7, the cathode of the seventh diode D7 is connected to the first end of the seventh switching device S7, the anode of the eighth diode D8 is connected to the second end of the eighth switching device S8, and the cathode of the eighth diode D8 is connected to the second end of the eighth switching device S8.

[0040] By connecting the diode in reverse parallel with the switching device, the high voltage that the switching device is subjected to when it is cut off can be released, playing a role of freewheeling and avoiding damage to the switching device.

[0041] Optionally, the single-phase inverter module 10 in the second implementation may also include the inverter control circuit in the first implementation. Compared with the inverter control circuit in the first implementation, the inverter control circuit in the second implementation has the same internal structure, and the only difference is that the output end of the second sinusoidal pulse width modulator 143 is connected to the control end of the seventh switch device S7, and the output end of the second inverter 144 is connected to the control end of the eighth switch device S8, so that the seventh switch device S7 and the eighth switch device S8 are alternately turned on.

[0042] Alternatively, if Figure 1 As shown, the number of the single-phase inverter modules 10 can be three, and the three single-phase inverter modules 10 are respectively connected to the three ports of the three-phase AC port 30. The three single-phase inverter modules can be combined to generate three-phase AC power.

[0043] 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 differ by 120°. That is, the output voltages of the three single-phase inverter modules 10 are respectively:

[0044]

[0045] Among them, u a 、u b 、u c are the output voltage of the single-phase inverter module, ω is the grid voltage frequency, U a , U b , U c are the output voltage amplitudes of the single-phase inverter modules and U a =U b =U c ,θ a ,θ b ,θ c They are the phases of the output voltages of the single-phase inverter modules, and the difference between them is 120°. dc is the voltage value of the DC bus.

[0046] The relationship between the fundamental amplitude of the output voltage of the single-phase inverter module of the first implementation and the voltage of the DC bus is:

[0047] U m =mU dc ; (2)

[0048] Among them, U m is the fundamental amplitude of the output voltage of the single-phase inverter module, U m =U a =U b =U c , m is the modulation depth, and satisfies m≤1, U dc is the voltage of the DC bus.

[0049] The relationship between the output voltage fundamental amplitude of the single-phase inverter module and the DC bus voltage in the second implementation is:

[0050]

[0051] Among them, U m is the fundamental amplitude of the output voltage of the single-phase inverter module, U m =U a=U b =U c , m is the modulation depth, and satisfies m≤1, U dc is the voltage of the DC bus.

[0052] Therefore, under the conditions of 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 a higher power capacity.

[0053] In an implementation of the embodiment of the present disclosure, the harmonic current control circuit 13 of the three single-phase inverter modules 10 may be the same. Implementing with the same circuit can reduce the implementation cost.

[0054] In another implementation of the embodiment of the present disclosure, 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 can be integrated together. Through integration, modular design is achieved.

[0055] The present disclosure provides an energy router, which includes Figure 1 AC port shown.

[0056] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. An AC port of an energy router, characterized in that: The AC 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 to a DC bus (20), and the output end of the inverter circuit (11) is connected to a three-phase AC port (30); the harmonic current suppression circuit (12) comprises a first switch device S1, a second switch device S2, an inductor L and a capacitor C, the first end of the first switch device S1 is connected to the positive electrode of the DC bus (20), the second end of the first switch device S1 is connected to the first end of the second switch device S2, the second end of the second switch device S2 is connected to the negative electrode of the DC bus (20), the first end of the inductor L is connected to the positive electrode of the first switch device S1, and the second end of the second switch device S2 is connected to the negative electrode of the DC bus (20). The second end of the inductor L is connected to the first end of the capacitor C, and the second end of the capacitor C is connected to the second end of the second switch device S2; the harmonic current control circuit (13) comprises a first subtractor (131), a first proportional integral controller (132), a first sinusoidal pulse width modulator (133) and a first inverter (134) connected in sequence, the 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), the output end of the first sinusoidal pulse width modulator (133) is connected to the control end of the first switch device S1, and the output end of the first inverter (134) is connected to the control end of the second switch device S2; The input current of the harmonic current suppression circuit (12) is detected by a current sensor; after the current sensor detects the input current of the harmonic current suppression circuit (12), the current is input into the first subtractor (131) for comparison, and the current is first input into a spectrum analyzer to determine the harmonic current of the input current, and then based on the determined harmonic current, a signal generator is used to generate a corresponding harmonic current, and the harmonic current is input into the first subtractor (131) for comparison; The inverter circuit (11) comprises a third switch device S3, a fourth switch device S4, a fifth switch device S5 and a sixth switch device S6, wherein a first end of the third switch device S3 and a first end of the fifth switch device S5 are connected to a positive electrode of the DC bus (20), a second end of the fourth switch device S4 and a second end of the sixth switch device S6 are connected to a negative electrode of the DC bus (20), a second end of the third switch device S3 is connected to a first end of the fourth switch device S4, a second end of the fifth switch device S5 is connected to a first end of the sixth switch device S6, and a second end of the third switch device S3 and a second end of the fifth switch device S5 are connected to the three-phase AC port (30) via a coupling inductor; The single-phase inverter module (10) further comprises an inverter control circuit (14), the inverter control circuit (14) comprising a second subtractor (141), a second proportional integral controller (142), a second sinusoidal pulse width modulator (143) and a second inverter (144) connected in sequence, the two input ends of the second subtractor (141) being respectively connected to the output voltage of the single-phase inverter module (10) and the set voltage of the single-phase inverter module (10), the output end of the second sinusoidal pulse width modulator (143) being connected to the control end of the third switch device S3 and the control end of the sixth switch device S6, and the output end of the second inverter (144) being connected to the control end of the fourth switch device S4 and the control end of the fifth switch device S5.

2. The AC port according to claim 1, characterized in that: 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 end of the third switch device S3, a cathode of the first diode D1 is connected to the first end of the third switch device S3, an anode of the second diode D2 is connected to the second end of the fourth switch device S4, a cathode of the second diode D2 is connected to the first end of the fourth switch device S4, an anode of the third diode D3 is connected to the second end of the fifth switch device S5, a cathode of the third diode D3 is connected to the first end of the fifth switch device S5, an anode of the fourth diode D4 is connected to the second end of the sixth switch device S6, and a cathode of the fourth diode D4 is connected to the first end of the sixth switch device S6.

3. The AC port according to claim 1 or 2, characterized in that: The number of the single-phase inverter modules (10) is three, and the three single-phase inverter modules (10) are respectively connected to the three ports of the three-phase AC port (30).

4. The AC port according to claim 3, characterized in that: The harmonic current control circuit (13) of the three single-phase inverter modules (10) is the same.

5. The AC port according to claim 3, characterized in that: The inverter circuit (11), the harmonic current suppression circuit (12) and the harmonic current control circuit (13) are integrated together in the same single-phase inverter module (10).

6. An energy router, characterized in that: The energy router comprises an AC port as described in any one of claims 1 to 5.

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