Power generation system

Abstract

The utility model provides a power generation system. The power generation system comprises an AC generator, a rectifier and an inverter. The input end of the rectifier is connected with the output end of the alternator. The inverter includes a first DC terminal and an AC terminal. The first DC terminal is used for connecting the output end of the rectifier, and the AC terminal is used for connecting a power grid and / or an AC load. The power generation system provided by the utility model can improve the working stability and reliability of the inverter while solving the problem of energy infusion to the generator.

Description

Technical Field

[0001] The present application relates to the field of microgrid technology, and in particular to a power generation system. Background Art

[0002] In areas with energy shortages, the power grid is unstable and may experience frequent power outages. Related technologies use an inverter that pairs a generator with a photovoltaic module. During a power outage, the generator provides grid support for the inverter. At this point, the inverter operates in grid-connected mode, and the generator and photovoltaic module jointly power the load. However, this solution has several drawbacks: First, the generator cannot absorb energy. When the energy output by the photovoltaic module is transferred to the generator through the inverter, it may damage the generator. To prevent this energy from being transferred to the generator, an electric meter and related complex control algorithms are required to control the inverter. However, this approach cannot prevent some energy from being transferred to the generator when there are sudden changes in photovoltaic energy or load, resulting in poor results. Second, the generator's output voltage waveform is typically poor when lightly loaded, and the inverter must operate in grid-connected mode. Ensuring stable operation of the inverter under poor grid waveforms also affects the inverter's reliability and grid-connected current regulation capabilities. Utility Model Content

[0003] In view of this, the present application provides a power generation system that can solve the problem of energy transfer to the generator while improving the working stability and reliability of the inverter.

[0004] In a first aspect, the present application provides a power generation system comprising an AC generator, a rectifier, and an inverter. The rectifier's input terminal is connected to the AC generator's output terminal. The inverter includes a first DC terminal and an AC terminal. The first DC terminal is connected to the rectifier's output terminal, and the AC terminal is connected to a power grid and / or an AC load.

[0005] In one embodiment, the power generation system further comprises a control line, one end of which is connected to the inverter, and the other end of which is connected to the AC generator.

[0006] In one embodiment, the inverter further includes a first DC-DC conversion circuit and an inverter circuit, the input end of the first DC-DC conversion circuit is connected to the output end of the rectifier through a first DC terminal, the output end of the first DC-DC conversion circuit is connected to the DC end of the inverter circuit through a DC bus, and the AC end of the inverter circuit is connected to the AC terminal.

[0007] In one embodiment, the AC generator includes a fuel-fired generator and a gas-fired generator.

[0008] In one embodiment, the output end of the AC generator includes three phase line terminals, the input end of the rectifier includes three input terminals, the output end of the rectifier includes a positive output terminal and a negative output terminal, and the rectifier includes a three-phase rectifier circuit, wherein the three-phase rectifier circuit includes three rectifier bridge arms connected in parallel, and one end of the three rectifier bridge arms is connected to the positive output terminal, and the other end of the three rectifier bridge arms is connected to the negative output terminal, each rectifier bridge arm includes two diodes connected in series, and the midpoint between the two diodes serves as an input terminal, and the three phase line terminals are connected one-to-one with the input terminals on the three rectifier bridge arms.

[0009] In one embodiment, the power generation system further includes a first switching circuit, wherein a first end of the first switching circuit is connected to the output end of the AC generator, and a second end of the first switching circuit is connected to the input end of the rectifier.

[0010] In one embodiment, the power generation system further includes a second switching circuit and a third switching circuit, wherein a first end of the second switching circuit is connected to the AC terminal, a second end of the second switching circuit is connected to the power grid, the second switching circuit is disconnected when the power grid is in an abnormal state, and the second switching circuit is connected when the power grid is in a normal state; a first end of the third switching circuit is connected to the AC terminal, a second end of the third switching circuit is connected to the AC load, the third switching circuit is connected when the AC load is in an operating state, and the third switching circuit is disconnected when the AC load is in a shutdown state.

[0011] In one embodiment, when the second switch circuit is disconnected and the third switch circuit is turned on, the first switch circuit is turned on and the AC generator is in a started state; when the second switch circuit is turned on and the third switch circuit is turned on, the first switch circuit is disconnected and / or the AC generator is in a stopped state.

[0012] In one embodiment, the inverter further includes a second DC terminal and a second DC-DC conversion circuit, the second DC terminal is used to connect to the photovoltaic module, the input end of the second DC-DC conversion circuit is connected to the second DC terminal, and the output end of the second DC-DC conversion circuit is connected to the DC end of the inverter circuit through a DC bus.

[0013] In one embodiment, the inverter further includes a third DC terminal and a third DC-DC conversion circuit, the third DC terminal is used to connect to the energy storage device, the first end of the third DC-DC conversion circuit is used to connect to the third DC terminal, and the second end of the third DC-DC conversion circuit is connected to the DC end of the inverter circuit through a DC bus.

[0014] In the power generation system provided herein, an AC generator is connected to the DC terminals of an inverter via a rectifier, and the AC terminals of the inverter are used to connect to an AC load and / or a power grid. This isolates the AC generator through the rectifier, preventing energy from other power generation equipment or the power grid connected to the inverter from being transferred to the AC generator through the inverter, thereby reducing the probability of damage to the AC generator and increasing its service life. Furthermore, because the AC generator and the power grid are not both connected to the AC terminals of the inverter in the power generation system provided herein, this improves the inverter's operational stability while preventing the AC waveform output by the AC generator from affecting the inverter's grid-connected control. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of this application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of this application and should not be regarded as limiting the scope of protection of this application. In each of the drawings, similar components are numbered similarly.

[0016] Figure 1 This is a circuit connection diagram of an inverter involved in the related art.

[0017] Figure 2 A circuit block diagram of a power generation system provided in one embodiment of the present application.

[0018] Figure 3 This is a circuit block diagram of an inverter provided in one embodiment of the present application.

[0019] Figure 4 A circuit diagram of a rectifier provided in one embodiment of the present application.

[0020] Figure 5 A circuit connection diagram of a power generation system provided in another embodiment of the present application.

[0021] Figure 6 A circuit connection diagram of a power generation system provided in another embodiment of the present application.

[0022] Figure 7 This is a circuit block diagram of an inverter provided in another embodiment of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0024] It is understood that the connection relationships described in this application refer to direct or indirect connections. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B via one or more other electrical components. For example, A and C can be directly connected, and C can be directly connected to B, so that A and B are connected through C. It is also understood that the description of "A connecting to B" in this application can be a direct connection between A and B or an indirect connection between A and B via one or more other electrical components.

[0025] In the description of this application, unless otherwise specified, " / " means "or". For example, A / B can mean A or B. "And / or" in this document is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0026] In the description of this application, words such as "first" and "second" are used only to distinguish different objects and do not limit the quantity or execution order. In addition, words such as "first" and "second" do not necessarily mean different. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0028] The following will describe some embodiments with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0029] In energy-scarce areas, the power grid is unstable and power outages may occur frequently. Figure 1The illustrated inverter 110, coupled with an AC generator 130 and a photovoltaic module 160, utilizes the AC generator 130 to provide grid support for the inverter 110 during a power outage. In this case, the inverter 110 operates in grid-connected mode, and the AC generator 130 and the photovoltaic module 160 jointly power the AC load 140. However, this solution has several drawbacks: First, the AC generator 130 cannot absorb energy. Energy output from the photovoltaic module 160, when transferred through the inverter 110 to the AC generator 130, may damage the AC generator 130. To prevent energy from being transferred to the AC generator 130, an electric meter 150 and associated complex control algorithms are required to control the inverter 110. However, this approach cannot prevent some energy from being transferred to the AC generator 130 during sudden changes in photovoltaic power or load, resulting in poor performance. Second, the output voltage waveform of the AC generator 130 is usually very poor under light load, and the inverter 110 needs to operate in grid-connected mode. Ensuring the stable operation of the inverter 110 under a very poor grid waveform also affects the reliability of the inverter 110 and the grid-connected current control capability.

[0030] Based on this, the present application provides a power generation system that can solve the problem of energy input to the AC generator while improving the working stability and reliability of the inverter.

[0031] See also Figure 2 , Figure 2 This is a circuit block diagram of a power generation system 10 provided in one embodiment of the present application. The power generation system 10 includes at least an inverter 110, a rectifier 120, and an AC generator 130. The inverter 110 includes a first DC terminal and an AC terminal. The first DC terminal includes a first positive DC terminal D1+ and a first negative DC terminal D1-. The AC terminal includes a first AC terminal L1, a second AC terminal L2, and a third AC terminal L3. The input end of the rectifier 120 is used to connect to the output end of the AC generator 130. The first DC terminal is used to connect to the output end of the rectifier 120. The AC terminal is used to connect to the power grid 170 and / or the AC load 140.

[0032] In power generation system 10, AC generator 130, upon startup, can output AC power to rectifier 120. Rectifier 120 is configured to convert AC power received at its input terminal into DC power, which is then output to the first DC terminal of inverter 110 via its output terminal. Inverter 110 is configured to convert DC power received at its first DC terminal into AC power, which is then output to AC load 140 via the AC terminal, and / or to feed the AC power into power grid 170. This allows AC generator 130 to supply power to AC load 140 even when an abnormality occurs in power grid 170 (including a power outage), ensuring normal operation of AC load 140.

[0033] In the power generation system 10 provided herein, an AC generator 130 is connected to the DC terminals of an inverter 110 via a rectifier 120. The AC terminals of the inverter 110 are used to connect to an AC load 140 and / or a power grid 170. Thus, by isolating the AC generator 130 through the rectifier 120, energy from other power generation equipment connected to the inverter 110 or the power grid 170 can be prevented from being transferred to the AC generator 130 through the inverter 110, thereby reducing the probability of damage to the AC generator 130 and increasing the service life of the AC generator 130. Furthermore, because the AC generator 130 and the power grid 170 are not both connected to the AC terminals of the inverter 110 in the power generation system 10 provided herein, the operating stability of the inverter 110 can be improved while preventing the waveform of the AC power output by the AC generator 130 from affecting the grid-connected control of the inverter 110.

[0034] In some embodiments, the inverter 110 may serve as a main control module of the power generation system 10 , such that the inverter 110 may at least control the AC generator 130 to start and output AC power, or control the AC generator 130 to stop and output AC power.

[0035] For example, in some embodiments, the power generation system 10 further includes a control line 180. One end of the control line 180 is connected to the inverter 110, and the other end of the control line 180 is connected to the AC generator 130. The control line 130 is used to transmit electrical signals from the inverter 110 to the AC generator 130, thereby enabling the inverter 110 to control the start or stop of the AC generator 130. Specifically, the control line 180 may be a dry contact control line. The inverter 110 outputs a dry contact signal to the AC generator 130 via the control line 180, and the AC generator 130 starts or stops based on the dry contact signal. For example, when the voltage of the dry contact signal is greater than or equal to a first voltage threshold, the AC generator 130 can be controlled to start; when the voltage of the dry contact signal is less than the first voltage threshold, the AC generator 130 can be controlled to stop. Thus, by providing the control line 180 in the power generation system 10, coordinated control of the power generation system 10 can be achieved, thereby improving the automation level of the power generation system 10.

[0036] For another example, in some embodiments, the inverter 110 and the AC generator 130 are both provided with a communication module (not shown in the figure), such as a Bluetooth communication module, a WIFI module, etc. In this way, the inverter 110 can send a control signal to the AC generator 130 through the communication module. At the same time, the AC generator 130 can receive the control signal through the communication module to start or stop.

[0037] Please continue reading Figure 3In some embodiments, the inverter 110 includes a first DC-DC converter (hereinafter referred to as the first DC / DC circuit) 111 and an inverter circuit (hereinafter referred to as the DC / AC converter) 112. The input end of the first DC / DC circuit 111 is connected to the output end of the rectifier 120 through a first DC terminal (i.e., a first positive DC terminal D1+ and a first negative DC terminal D1-). The output end of the first DC / DC circuit 111 is connected to the DC end of the inverter circuit 112 through a DC bus (including a positive DC bus BUS+ and a negative DC bus BUS-). The AC end of the inverter circuit 112 is connected to the AC terminals (i.e., a first AC terminal L1, a second AC terminal L2, and a third AC terminal L3).

[0038] The first DC / DC circuit 111 is used to obtain the DC power output by the rectifier 120 and perform DC conversion processing to output DC power with a preset voltage value to the DC bus. In some embodiments, the first DC / DC circuit 111 can perform maximum power tracking on the DC power output by the rectifier 120, and can also perform constant voltage conversion on the DC power output by the rectifier 120. The first DC / DC circuit 111 can be a buck circuit, a boost circuit, a buck-boost circuit, or other circuit that can implement DC conversion processing. This application does not limit the specific circuit structure of the first DC / DC circuit 111.

[0039] The DC / AC circuit 112 is used to obtain DC power from the DC bus and perform inversion processing to output AC power to power the AC load 140 and / or feed power to the power grid 170. The DC / AC circuit 112 can be a single-phase inverter circuit, a three-phase inverter circuit, or a multi-phase inverter circuit. The present application does not limit the number of phases at the AC end of the DC / AC circuit 112. In some embodiments, the DC / AC circuit 112 can be a unidirectional inverter circuit or a bidirectional inverter circuit. The present application also does not limit the specific circuit of the DC / AC circuit 112. For example, the DC / AC circuit 112 can be a half-bridge inverter circuit, a full-bridge inverter circuit, a push-pull inverter circuit, an isolated inverter circuit, or other circuit that can achieve an inverter function.

[0040] Please continue reading Figure 4 In some embodiments, the rectifier 120 includes a three-phase rectifier circuit. The input end of the rectifier 120 includes three input terminals, such as Figure 4The first input terminal a, the second input terminal b and the third input terminal c are shown. The output end of the rectifier 120 includes a positive output terminal out+ and a negative output terminal out-. Among them, the three-phase rectifier circuit includes three rectifier bridge arms connected in parallel, and one end of the three rectifier bridge arms is connected to the positive output terminal out+, and the other end of the three rectifier bridge arms is connected to the negative output terminal out-. Each rectifier bridge arm includes two diodes connected in series, and the midpoint between the two diodes is used as an input terminal. For example, this application Figure 4 The three-phase rectifier circuit shown includes a first bridge arm 121, a second bridge arm 122, and a third bridge arm 123. First bridge arm 121 includes a diode D1 and a diode D2. The anode of diode D1 is connected to the positive output terminal out+, the cathode of diode D1 is connected to the anode of diode D2, and the cathode of diode D2 is connected to the negative output terminal out-. The midpoint between the cathode of diode D1 and the anode of diode D2 serves as the third input terminal c. The anode of diode D3 is connected to the positive output terminal out+, the cathode of diode D3 is connected to the anode of diode D4, and the cathode of diode D4 is connected to the negative output terminal out-. The midpoint between the cathode of diode D3 and the anode of diode D4 serves as the second input terminal b. The anode of diode D5 is connected to the positive output terminal out+, the cathode of diode D5 is connected to the anode of diode D6, and the cathode of diode D6 is connected to the negative output terminal out-. The midpoint between the cathode of diode D5 and the anode of diode D6 serves as the first input terminal a.

[0041] It is understandable that in other embodiments, the rectifier 120 may also adopt other rectifier circuits, and the present application does not limit the specific circuit structure of the rectifier circuit adopted by the rectifier 120.

[0042] In some embodiments, the output end of the AC generator 130 includes three phase terminals, which are connected to the input terminals of the three rectifier bridge arms of the rectifier 120 in a one-to-one correspondence.

[0043] In some embodiments, AC generator 130 may be a fuel generator, including oil-fired generators and gas-fired generators. For example, an oil-fired generator may be a diesel generator or a gasoline generator. In some embodiments, AC generator 130 may also be a new energy generator. This new energy generator may be a device that generates electricity using wind energy, tidal energy, geothermal energy, biomass energy, or hydrogen energy, such as a wind turbine or a hydrogen generator. It is understood that in other embodiments, AC generator 130 may be replaced with other devices for outputting alternating current.

[0044] The AC load 140 may be an AC power device. In some embodiments, the AC load 140 may include an electrically connected power adapter and a DC load ( Figure 2(not shown), and the power adapter converts the AC power obtained from the DC / AC circuit 112 into DC power, and outputs it to the DC load to power the DC load.

[0045] The electrical grid 170 may be a utility grid.

[0046] It is understandable that in the above embodiment, the AC generator 130 is a three-phase AC generator, the rectifier 120 includes a three-phase rectifier circuit, the output end of the inverter 110 includes three phase line terminals, and the power grid 170 is a three-phase AC power grid to illustrate the working principle of the power generation system 10. In other embodiments, the AC generator 130, the rectifier 120, the inverter 110 and the power grid 170 can also be AC devices with other numbers of phases. This application does not limit the number of phases of the AC ends of each AC device involved in the power generation system 10.

[0047] Please continue reading Figure 5 In some embodiments, the power generation system 10 further includes a first switch circuit 190 , a second switch circuit 200 , and a third switch circuit 210 .

[0048] A first end of the first switch circuit 190 is connected to the output end of the AC generator 130, and a second end of the first switch circuit 190 is connected to the input end of the rectifier 120. In the power generation system 10, the first switch circuit 190 can be disconnected when the dry contact signal sent by the inverter 110 to the AC generator 130 for controlling the shutdown of the AC generator 130 fails, thereby preventing the electric energy of the AC generator 130 from damaging the inverter 110 through the rectifier 120.

[0049] A first end of the second switch circuit 200 is connected to the AC terminal, and a second end of the second switch circuit 200 is connected to the grid 170. In the power generation system 10, the second switch circuit 200 is disconnected when the grid 170 is in an abnormal state, and is connected when the grid 170 is in a normal state.

[0050] A first end of the third switch circuit 210 is connected to the AC terminal, and a second end of the third switch circuit 210 is connected to the AC load 140. In the power generation system 10, the third switch circuit 210 is turned on when the AC load 140 is in operation, and is turned off when the AC load 140 is in shutdown.

[0051] Thus, in this embodiment, by providing the first switch circuit 190, the second switch circuit 200 and the third switch circuit 210, the electrical connection between the inverter 110 and each device can be disconnected in time, the protection of the inverter 110 can be realized more flexibly, and the stability of the inverter 110 can be improved.

[0052] Furthermore, in some embodiments, when the second switching circuit 200 is disconnected and the third switching circuit 210 is connected, the first switching circuit 190 is connected and the AC generator 130 is in an activated state. Thus, in the power generation system 10, when an abnormality occurs in the power grid 170 but the AC load 140 is still operating, the AC generator 130 can provide the required operating power to the load 140 through the conductive first switching circuit 190 and the third switching circuit 210. At the same time, because the second switching circuit 200 is disconnected, the power grid 170 is prevented from affecting the normal operation of the AC terminal of the inverter 110, thereby improving the operating stability of the inverter 110.

[0053] In some embodiments, when the second switching circuit 200 is on and the third switching circuit 210 is on, the first switching circuit 190 is off and / or the AC generator 130 is in a shutdown state. In this manner, in the power generation system 10, when the power grid 170 is normal and the AC load 140 is operating, the power grid 170 can provide the AC load 140 with the power required for operation. Simultaneously, by controlling the AC generator 130 to be in a shutdown state through the inverter 110, fuel consumption and noise generated by the operation of the AC generator 130 can be reduced. Furthermore, when the first switching circuit 190 is off, the probability of damage to the first DC terminal of the inverter 110 caused by the inrush current generated while the AC generator 130 is still in the startup state can be reduced.

[0054] See also Figure 6 In some embodiments, the power generation system 10 further includes a first sensor 220, a second sensor 230, and a third sensor 240. In some embodiments, the first sensor 220, the second sensor 230, and the third sensor 240 can be any one of a voltage sensor, a current sensor, and a power sensor.

[0055] The first sensor 220 is connected to the power grid 170 and is used to detect the status of the power grid 170. The status of the power grid 170 includes a normal state and an abnormal state. In some embodiments, when the first sensor 220 detects an abnormality in the actual voltage of the power grid 170, such as when the actual peak-to-peak value of the voltage is outside a preset range and / or when the actual voltage waveform is distorted, the first sensor 220 detects that the power grid 170 is in an abnormal state. Conversely, when the first sensor 220 detects that the actual peak-to-peak value of the voltage of the power grid 170 is within a preset range or when the actual voltage waveform is not distorted, the first sensor 220 detects that the power grid 170 is in a normal state. It is understood that an abnormal state of the power grid 170 includes a power outage of the power grid 170.

[0056] The second sensor 230 is connected to the AC load 140 and is used to detect the operating status of the AC load 140. The second sensor 230 can be used to detect the electrical signal output by the AC load 140. For example, when the second sensor 230 detects that the AC load 140 outputs a periodic electrical signal, such as a high-level signal, the second sensor 230 can determine that the AC load 140 is connected to the inverter 110 and is in an operating state. Conversely, when the second sensor 230 does not receive the electrical signal output by the AC load 140 within a preset time period, the second sensor 230 can determine that the AC load 140 is not connected to the inverter 110 or that the AC load 140 is in an off state. The operating state can be a state in which the AC load 140 obtains electrical energy provided by an external device to maintain certain functions, such as a normal operating state and a standby state. The off state can be a state in which the power supply to all functional modules within the AC load 140 is disconnected, causing the AC load 140 to be completely shut down.

[0057] Third sensor 240 is connected to the output terminal of AC generator 130 and is used to detect whether AC generator 130 is outputting AC power. For example, when third sensor 240 detects that the absolute value of the voltage at the output terminal of AC generator 130 is greater than or equal to a preset voltage value, third sensor 240 may determine that AC generator 130 is started. When third sensor 240 detects that the absolute value of the voltage at the output terminal of AC generator 130 is less than the preset voltage value, third sensor 240 may determine that AC generator 130 is stopped.

[0058] The inverter 110 also includes a controller 113. The controller 113 may be a microcontroller unit (MCU), a field programmable gate array (FPGA), etc. The controller 113 is connected to the AC generator 130, the first switch circuit 190, the third sensor 240, the third switch circuit 210, the second sensor 230, the first switch circuit 190, and the first sensor 220, for example, by electrical connection or communication connection. In this way, the controller 113 can obtain the detection results of the first sensor 220, the second sensor 230, and the third sensor 240, and output corresponding control instructions to the AC generator 130, the first switch circuit 190, the second switch circuit 200, and the third switch circuit 210 according to the detection results. It can be understood that in Figure 6 In the figure, the solid line represents the wire for transmitting electric energy, and the dotted line connected to the controller 113 represents the communication line or the dry contact control line.

[0059] Specifically, when the detection result of first sensor 220 indicates that grid 170 is abnormal and the detection result of second sensor 230 indicates that AC load 140 is operating, controller 113 outputs a dry contact signal to AC generator 130 via control line 180 to start AC generator 130. It also controls first switch circuit 190 to remain on, second switch circuit 200 to remain off, and third switch circuit 210 to remain on. At this point, because inverter 110 is in off-grid mode (i.e., disconnected from grid 170), inverter 110 can provide a low-THD voltage to AC load 140, improving the voltage quality of AC load 140.

[0060] When the detection result of the first sensor 220 is that the power grid 170 is in an abnormal state and the detection result of the second sensor 230 is that the AC load 140 is in an operating state, the controller 113 outputs a dry contact signal to the AC generator 130 through the control line 180 to control the AC generator 130 to shut down, and at the same time controls the first switch circuit 190 to disconnect, the second switch circuit 200 to remain on, and the third switch circuit 210 to remain on.

[0061] In some embodiments, the first switch circuit 190, the second switch circuit 200, and the third switch circuit 210 may each include electronic devices or circuits such as relays and switches that can implement switching functions. For example, the first switch circuit 190 may include relay switches K1, K2, and K3; the second switch circuit 200 may include relay switches K4, K5, and K6; and the third switch circuit 210 may include relay switches K7, K8, and K9.

[0062] Please continue reading Figure 7 In some embodiments, the inverter 110 further includes a second DC terminal and a second DC to DC converter circuit (hereinafter referred to as the second DC / DC circuit) 114. The second DC terminal includes, for example, a second positive DC terminal D2+ and a second negative DC terminal D2-. The second DC terminal is used to connect to the photovoltaic module ( Figure 7 (not shown), the input end of the second DC / DC circuit 114 is connected to the second DC terminal, and the output end of the second DC / DC circuit 114 is connected to the DC end of the DC / AC circuit 112 through the DC bus. The second DC / DC circuit 114 is used to implement maximum power point tracking of the photovoltaic module and output DC power to the DC bus.

[0063] In some embodiments, the inverter 110 further includes a third DC terminal and a third DC-DC converter circuit (hereinafter referred to as the third DC / DC circuit) 115. The second DC terminal includes, for example, a third positive DC terminal D3+ and a third negative DC terminal D3-. The third DC terminal is used to connect to the energy storage device ( Figure 7 (not shown), a first end of the third DC / DC circuit 115 is connected to a third DC terminal, and a second end of the third DC / DC circuit 115 is connected to the DC terminal of the DC / AC circuit 112 via a DC bus. The third DC / DC circuit 115 may be a bidirectional DC conversion circuit. Thus, the third DC / DC circuit 115 can obtain power from the DC bus to charge the energy storage device; the third DC / DC circuit 115 can also obtain power output from the energy storage device and output it to the DC bus to discharge the energy storage device.

[0064] In some embodiments, the AC end of the DC / AC circuit 112 is further connected to the AC terminal through an LCL filter circuit, an EMC circuit, etc.

[0065] This application is not limited to the specific embodiments described above. A person skilled in the art will readily appreciate that there are many alternatives to the test fixture of this application without departing from the principles and scope of this application. The scope of protection of this application shall be subject to the contents of the claims.

Claims

1. A power generation system, characterized in that: include: AC generator; a rectifier, wherein an input end of the rectifier is used to connect to an output end of the AC generator; The inverter includes a first DC terminal and an AC terminal, wherein the first DC terminal is used to connect to the output end of the rectifier, and the AC terminal is used to connect to the power grid and / or AC load.

2. The power generation system according to claim 1, characterized in that: The power generation system further includes a control line, one end of which is connected to the inverter, and the other end of which is connected to the AC generator.

3. The power generation system according to claim 1, characterized in that The inverter also includes a first DC-DC conversion circuit and an inverter circuit. The input end of the first DC-DC conversion circuit is connected to the output end of the rectifier through the first DC terminal. The output end of the first DC-DC conversion circuit is connected to the DC end of the inverter circuit through a DC bus. The AC end of the inverter circuit is connected to the AC terminal.

4. The power generation system according to claim 1, characterized in that: The AC generator includes a fuel generator and a gas generator.

5. The power generation system according to claim 1, characterized in that: The output end of the AC generator includes three phase line terminals, the input end of the rectifier includes three input terminals, the output end of the rectifier includes a positive output terminal and a negative output terminal, and the rectifier includes a three-phase rectifier circuit, wherein: The three-phase rectifier circuit includes three rectifier bridge arms connected in parallel, and one end of the three rectifier bridge arms is connected to the positive output terminal, and the other end of the three rectifier bridge arms is connected to the negative output terminal. Each of the rectifier bridge arms includes two diodes connected in series, and the midpoint between the two diodes serves as the input terminal. The three phase line terminals are connected one-to-one to the input terminals on the three rectifier bridge arms.

6. The power generation system according to claim 1, characterized in that: The power generation system further includes a first switching circuit, wherein a first end of the first switching circuit is connected to an output end of the AC generator, and a second end of the first switching circuit is connected to an input end of the rectifier.

7. The power generation system according to claim 6, characterized in that: The power generation system further includes a second switch circuit and a third switch circuit, wherein a first end of the second switch circuit is connected to the AC terminal, a second end of the second switch circuit is connected to the power grid, the second switch circuit is disconnected when the power grid is in an abnormal state, and the second switch circuit is connected when the power grid is in a normal state; The first end of the third switch circuit is connected to the AC terminal, the second end of the third switch circuit is connected to the AC load, the third switch circuit is turned on when the AC load is in the running state, and the third switch circuit is turned off when the AC load is in the shutdown state.

8. The power generation system according to claim 7, characterized in that: When the second switch circuit is disconnected and the third switch circuit is turned on, the first switch circuit is turned on and the AC generator is in the started state; when the second switch circuit is turned on and the third switch circuit is turned on, the first switch circuit is disconnected and / or the AC generator is in the stopped state.

9. The power generation system according to claim 3, characterized in that: The inverter also includes a second DC terminal and a second DC-DC conversion circuit. The second DC terminal is used to connect to the photovoltaic module. The input end of the second DC-DC conversion circuit is connected to the second DC terminal. The output end of the second DC-DC conversion circuit is connected to the DC end of the inverter circuit through the DC bus.

10. The power generation system according to claim 3, characterized in that: The inverter also includes a third DC terminal and a third DC-DC conversion circuit, the third DC terminal is used to connect to an energy storage device, the first end of the third DC-DC conversion circuit is used to connect to the third DC terminal, and the second end of the third DC-DC conversion circuit is connected to the DC end of the inverter circuit through the DC bus.

Images