CN115954938B - Efficient off-grid split-phase inverter circuit - Google Patents
Efficient off-grid split-phase inverter circuit Download PDFInfo
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- CN115954938B CN115954938B CN202211683634.2A CN202211683634A CN115954938B CN 115954938 B CN115954938 B CN 115954938B CN 202211683634 A CN202211683634 A CN 202211683634A CN 115954938 B CN115954938 B CN 115954938B
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- 239000004065 semiconductor Substances 0.000 claims abstract description 143
- 239000003990 capacitor Substances 0.000 claims abstract description 48
- 238000010248 power generation Methods 0.000 abstract description 5
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- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention belongs to the field of parallel network split phase inverter circuits. The invention provides a high-efficiency grid-connected split-phase inverter circuit which comprises a first semiconductor switch, a second semiconductor switch, a third semiconductor switch, a fourth semiconductor switch, a fifth semiconductor switch, a sixth semiconductor switch, a seventh semiconductor switch, an eighth semiconductor switch, a first capacitor, a second capacitor, a first diode, a second diode, a third diode, a fourth diode, a first inductor, a second inductor, a fifth diode and a sixth diode. According to the efficient off-grid split-phase inverter circuit, the fifth diode and the sixth diode are added between the two inversion bridge arms, so that when the system is in grid-connected operation or off-grid operation and is connected with a balance load, the inversion topology freewheel loop only passes through the two semiconductor devices, the loss of the devices to electric energy is reduced, and the power generation efficiency of the system is greatly improved.
Description
Technical Field
The invention belongs to the technical field of parallel network split-phase inverter circuits, and particularly relates to a high-efficiency off-grid split-phase inverter circuit.
Background
In different countries and regions of the world, for example, a single-phase power grid in North America has a single-phase three-phase split-phase output power grid, L1/N/L2, L1 to N120V and L2 to N180 degrees out of phase, and L1_L2 240V, and the schematic diagram is shown in FIG. 1. For the photovoltaic inverter off-grid system, when the system is in grid-connected operation, 240V voltage is output, and a user load with 120V split phase is supplied by a power grid. While the system is running off-grid, because it is required to simultaneously carry 120V or 240V user load, it is required to output two independent 120V voltages. In an application scenario with higher DC1 voltage, such as an inverter system with 1100V voltage, the prior art scheme often adopts two 1-shaped three-level bridge arms to output two independent control 120V, modulation waves are staggered by 180 degrees to form 240V, so as to obtain a single-phase three-wire split-phase output voltage, and a common topology is shown in fig. 2.
The current common single-phase three-wire system has split phase output topology as shown in figure 2. Taking a half cycle as an example, fig. 3 and fig. 4 are circuits of the photovoltaic inverter during grid-connected excitation and freewheeling, respectively, of the grid-connected system. In the grid connection process, as the power grid exists, 240V voltage and 120V voltage exist, a load of 120V at a user side can be directly supplied by the power grid, an inverter only needs to combine energy of a photovoltaic panel to the power grid, so that the inverter only needs to output 240V, the inverter works in a current source mode, two 120V powers are equal, no current basically flows through the midpoint of a BUS (BUS), but in the follow current stage of the inverter, the topology follow current loop passes through four semiconductor devices (T2A T3B D2B D A in fig. 4), so that the efficiency is greatly reduced, and in the photovoltaic inverter system, the energy white loss is caused by the reduced efficiency, and the power generation of the user is reduced.
Disclosure of Invention
The invention aims to provide an efficient grid-connected split-phase inverter circuit so as to solve the problem of low power generation efficiency of the existing grid-connected split-phase inverter circuit.
The invention provides a high-efficiency grid-connected split-phase inverter circuit, which comprises a first semiconductor switch, a second semiconductor switch, a third semiconductor switch, a fourth semiconductor switch, a fifth semiconductor switch, a sixth semiconductor switch, a seventh semiconductor switch, an eighth semiconductor switch, a first capacitor, a second capacitor, a first diode, a second diode, a third diode, a fourth diode, a first inductor and a second inductor, wherein the first capacitor and the second capacitor are connected in series and then are connected in parallel with a power supply, the first semiconductor switch, the second semiconductor switch, the third semiconductor switch and the fourth semiconductor switch are connected in series and then are connected in parallel with the power supply, the fifth semiconductor switch, the sixth semiconductor switch, the seventh semiconductor switch and the eighth semiconductor switch are connected in series and then are connected in parallel with the power supply, the cathode of the first diode is connected between the first semiconductor switch and the second semiconductor switch, the anode of the first diode is connected with the cathode of the second diode, the anode of the second diode is connected between the third semiconductor switch and the fourth semiconductor switch, one end of the first inductor is connected between the sixth semiconductor switch and the seventh semiconductor switch, the other end of the first inductor is connected with one end of the second inductor, the other end of the second inductor is connected between the second semiconductor switch and the third semiconductor switch, the anode of the first diode and the cathode of the second diode are also connected between the first capacitor and the second capacitor, the anode of the third diode is connected with the cathode of the fourth diode, the cathode of the third diode is connected between the fifth semiconductor switch and the sixth semiconductor switch, the fourth diode is connected between the seventh semiconductor switch and the eighth semiconductor switch, the anode of the first diode and the cathode of the second diode are also connected between the third diode and the fourth diode, and the third diode and the sixth diode are also included, wherein the third diode is connected between the third diode and the fourth diode;
the anode of the fifth diode is connected between the sixth semiconductor switch and the seventh semiconductor switch, and the cathode of the fifth diode is connected between the first semiconductor switch and the second semiconductor switch;
the positive electrode of the sixth diode is connected between the second semiconductor switch and the third semiconductor switch, and the negative electrode of the sixth diode is connected between the fifth semiconductor switch and the sixth semiconductor switch.
According to the efficient off-grid split-phase inverter circuit, the fifth diode and the sixth diode are added between the two inversion bridge arms, so that when the system is in grid-connected operation or off-grid operation and is connected with a balance load, the inversion topology freewheel loop only passes through the two semiconductor devices, the loss of the devices to electric energy is reduced, and the power generation efficiency of the system is greatly improved.
Further, the capacitor further comprises a third capacitor and a fourth capacitor, wherein:
one end of the third capacitor is connected with the first inductor, the other end of the third capacitor is connected with the fourth capacitor, and the other end of the fourth capacitor is connected with the second inductor.
Further, the device also comprises a first load and a second load, wherein the first load and the second load are connected in series and then connected with the third capacitor and the fourth capacitor in parallel.
Further, the first semiconductor switch, the second semiconductor switch, the third semiconductor switch, the fourth semiconductor switch, the fifth semiconductor switch, the sixth semiconductor switch, the seventh semiconductor switch, and the eighth semiconductor switch may be any one of an IGBT or a MOS.
Further, the off-grid split phase inverter circuit is connected with a single-phase three-wire split phase power grid, and the split phase voltage is any one of 100V, 110V and 120V
Drawings
Fig. 1 is a schematic diagram of a split-phase power grid in an application system scenario of a high-efficiency off-grid split-phase inverter circuit of the present invention;
fig. 2 is a circuit diagram of a 1-type three-level single-phase inverter circuit in the prior art;
fig. 3 is a positive half-cycle excitation loop of the 1-type three-level single-phase inverter circuit in fig. 2;
FIG. 4 is a positive half cycle freewheel loop of the three-level single-phase inverter circuit of FIG. 2;
FIG. 5 is a topology of an efficient off-grid split phase inverter circuit in an embodiment of the invention;
FIG. 6 is a grid-tie excitation loop of the efficient off-grid split phase inverter circuit of FIG. 5;
FIG. 7 is a freewheeling circuit during grid connection of the efficient off-grid split phase inverter circuit of FIG. 5;
FIG. 8 is an off-grid excitation loop of the high efficiency off-grid split phase inverter circuit of FIG. 5;
fig. 9 is an off-grid freewheeling circuit of the efficient off-grid split-phase inverter circuit of fig. 5.
Description of main reference numerals:
the invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 5 to 9, the high-efficiency off-grid split-phase inverter circuit provided by the embodiment of the invention comprises a first semiconductor switch T1A, a second semiconductor switch T2A, a third semiconductor switch T3A, a fourth semiconductor switch T4A, a fifth semiconductor switch T1B, a sixth semiconductor switch T2B, a seventh semiconductor switch T3B, an eighth semiconductor switch T4B, a first capacitor C1, a second capacitor C2, a first diode D1A, a second diode D2A, a third diode D1B, a fourth diode D2B, a first inductor L1 and a second inductor L2, wherein the first and second capacitors C1 and C2 are connected in series and then are connected in parallel with a power supply DC1, the first and second semiconductor switches T1A, the third and fourth semiconductor switches T3A and T4A are connected in series and then are connected in parallel with the power supply DC1, the fifth and sixth and seventh semiconductor switches T1B and seventh semiconductor switches T2B are connected in series and then are connected in parallel with the power supply DC1, the cathode of the first diode D1A is connected between the first semiconductor switch T1A and the second semiconductor switch T2A, the anode of the first diode D1A is connected with the cathode of the second diode D2A, the anode of the second diode D2A is connected between the third semiconductor switch T3A and the fourth semiconductor switch T4A, one end of the first inductor L1 is connected between the sixth semiconductor switch T2B and the seventh semiconductor switch T3B, the other end of the first inductor L1 is connected with one end of the second inductor L2, the other end of the second inductor L2 is connected between the second semiconductor switch T2A and the third semiconductor switch T3A, the anode of the first diode D1A and the cathode of the second diode D2A are also connected between the first capacitor C1 and the second capacitor C2, the positive electrode of the third diode D1B is connected to the negative electrode of the fourth diode D2B, the negative electrode of the third diode D1B is connected between the fifth semiconductor switch T1B and the sixth semiconductor switch T2B, the fourth diode D2B is connected between the seventh semiconductor switch T3B and the eighth semiconductor switch T4B, the positive electrode of the first diode D1A and the negative electrode of the second diode D2A are also connected between the third diode D1B and the fourth diode D2B, and further include a fifth diode D3 and a sixth diode D4, wherein;
the positive electrode of the fifth diode D3 is connected between the sixth semiconductor switch T2B and the seventh semiconductor switch T3B, and the negative electrode of the fifth diode D3 is connected between the first semiconductor switch T1A and the second semiconductor switch T2A;
the positive electrode of the sixth diode D4 is connected between the second semiconductor switch T2A and the third semiconductor switch T3A, and the negative electrode of the sixth diode D4 is connected between the fifth semiconductor switch T1B and the sixth semiconductor switch T2B.
According to the efficient off-grid split-phase inverter circuit, the fifth diode D3 and the sixth diode D4 are added between the two inversion bridge arms, so that when the system is in grid-connected operation or off-grid operation and is connected with a balance load, the inversion topology freewheel loop only passes through two semiconductor devices, the loss of the devices to electric energy is reduced, and the power generation efficiency of the system is greatly improved.
Specifically, in the embodiment of the present invention, the capacitor further includes a third capacitor C3 and a fourth capacitor C4, where:
one end of the third capacitor C3 is connected to the first inductor L1, the other end of the third capacitor C is connected to the fourth capacitor C4, and the other end of the fourth capacitor C4 is connected to the second inductor L2.
Specifically, in the embodiment of the present invention, the load control circuit further includes a first load1 and a second load2, where the first load1 and the second load2 are connected in series and then connected in parallel with a third capacitor C3 and a fourth capacitor C4.
Specifically, in the embodiment of the present invention, the first semiconductor switch T1A, the second semiconductor switch T2A, the third semiconductor switch T3A, the fourth semiconductor switch T4A, the fifth semiconductor switch T1B, the sixth semiconductor switch T2B, the seventh semiconductor switch T3B, and the eighth semiconductor switch T4B may be any one of an IGBT or a MOS.
Specifically, in the embodiment of the present invention, the off-grid split-phase inverter circuit is connected to a single-phase three-wire split-phase power grid (a first power grid AC1 and a second power grid AC 2), and the split-phase voltage is any one of 100V, 110V, and 120V.
Referring to fig. 5 again, in the circuit topology of fig. 5, during the grid-connected operation, the photovoltaic inverter directly outputs an ac voltage 240V from the grid-connected system without considering the split phase output function, that is, the loads of the third capacitor C3 and the fourth capacitor C4 are completely equal, that is, the currents of the first inductor L1 and the second inductor L2 are equal, only one loop is provided during the positive half-cycle, and the current only flows through the semiconductor device (the fifth diode D3, the second semiconductor switch T2A), so that the efficiency is very high.
Referring to fig. 8 again, when the photovoltaic inverter is off-grid in operation of the grid-connected system, two three-level bridge arms (the first is a first semiconductor switch T1A, a second semiconductor switch T2A, a third semiconductor switch T3A, a fourth semiconductor switch T4A, the second is a fifth semiconductor switch T1B, a sixth semiconductor switch T2B, a seventh semiconductor switch T3B, an eighth semiconductor switch T4B) and a fifth diode D3, a sixth diode D4 all participate in the operation, the inverter can output two independent 120V alternating voltages, supports to carry loads (a first load1 and a second load 2) respectively, and has higher efficiency when off-grid loads are completely balanced (the first load1 and the second load2 are equal), namely, when loads of the third capacitor C3 and the fourth capacitor C4 are balanced, current flows away from a path of the fifth diode D3 and the sixth diode D4 during freewheeling and a loop during grid-connected operation are the same. However, when the loads of the third capacitor C3 and the fourth capacitor C4 are unbalanced, there is a freewheel loop, so as to meet the application requirements.
The current path is shown in figure 8 when the photovoltaic inverter is in off-grid operation of the off-grid system and the off-grid split phase load is unbalanced; that is, when the first load1 and the second load2 are not equal, there is an unbalanced current flow between the N point and the O point. In the freewheeling, if the first load1> the second load2 and neither is 0, the freewheeling circuit is divided into two circuits, the first circuit is a first inductor L1, a fifth diode D3, a second semiconductor switch T2A, a second inductor L2, the first load2, the second load1 and the first inductor L1, and the second freewheeling circuit is a first inductor L1, a seventh semiconductor switch T3B, a fourth diode D2B, load1 and the first inductor L1; if the second load2> the first load1 and neither is 0, the freewheeling loop is also two loops, the first freewheeling loop is the second inductor L2, the second load2, the first load1, the first inductor L1, the fifth diode D3, the second semiconductor switch T2A, the second inductor L2. The second freewheeling circuit is a second inductor L2, a second load2, a first diode D1A, a second semiconductor switch T2A, and a second inductor L2.
The high-efficiency off-grid split-phase inverter circuit meets the requirement of the photovoltaic inverter on unbalanced load of split phases during off-grid operation of an off-grid system, and improves the efficiency of the system during grid connection and off-grid operation and balanced load of split phases
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (5)
1. An efficient grid-connected split-phase inverter circuit comprises a first semiconductor switch, a second semiconductor switch, a third semiconductor switch, a fourth semiconductor switch, a fifth semiconductor switch, a sixth semiconductor switch, a seventh semiconductor switch, an eighth semiconductor switch, a first capacitor, a second capacitor, a first diode, a second diode, a third diode and a fourth diode, a first inductor and a second inductor, wherein the first capacitor and the second capacitor are connected in series and then connected with a power supply in parallel, the first semiconductor switch, the second semiconductor switch, the third semiconductor switch and the fourth semiconductor switch are connected in series and then connected with the power supply in parallel, the fifth semiconductor switch, the sixth semiconductor switch, the seventh semiconductor switch and the eighth semiconductor switch are connected in parallel with the power supply, the cathode of the first diode is connected between the first semiconductor switch and the second semiconductor switch, the anode of the first diode is connected with the cathode of the second diode, the anode of the second diode is connected between the second diode and the anode of the third semiconductor switch and the second diode, the anode of the second diode is connected between the anode of the first diode and the second diode is connected with the cathode of the third semiconductor switch, the anode of the second diode is connected between the anode of the first diode and the second diode is connected with the anode of the third semiconductor switch, the fourth diode is connected between the seventh semiconductor switch and the eighth semiconductor switch, and the anode of the first diode and the cathode of the second diode are also connected between the third diode and the fourth diode, and the semiconductor switch is characterized by also comprising a fifth diode and a sixth diode, wherein;
the anode of the fifth diode is connected between the sixth semiconductor switch and the seventh semiconductor switch, and the cathode of the fifth diode is connected between the first semiconductor switch and the second semiconductor switch;
the positive electrode of the sixth diode is connected between the second semiconductor switch and the third semiconductor switch, and the negative electrode of the sixth diode is connected between the fifth semiconductor switch and the sixth semiconductor switch.
2. An efficient off-grid split phase inverter circuit as defined in claim 1, further comprising a third capacitor and a fourth capacitor, wherein:
one end of the third capacitor is connected with the first inductor, the other end of the third capacitor is connected with the fourth capacitor, and the other end of the fourth capacitor is connected with the second inductor.
3. An efficient off-grid split phase inverter circuit according to claim 2 further comprising a first load and a second load connected in series with the third and fourth capacitors.
4. An efficient off-grid split phase inverter circuit according to claim 1, wherein the first, second, third, fourth, fifth, sixth, seventh and eighth semiconductor switches are any one of IGBTs or MOS.
5. The efficient off-grid split phase inverter circuit of claim 1 wherein the off-grid split phase inverter circuit is connected to a single-phase three-wire split phase grid with a split phase voltage of any one of 100V, 110V, 120V.
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| CN202211683634.2A CN115954938B (en) | 2022-12-27 | 2022-12-27 | Efficient off-grid split-phase inverter circuit |
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| CN202211683634.2A CN115954938B (en) | 2022-12-27 | 2022-12-27 | Efficient off-grid split-phase inverter circuit |
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| CN103312205A (en) * | 2013-06-28 | 2013-09-18 | 石家庄通合电子科技股份有限公司 | Non-transformer single-phase grid-connected inverter control method |
| CN203301393U (en) * | 2013-06-28 | 2013-11-20 | 石家庄通合电子科技股份有限公司 | Non transformer single-phase grid connected inverter |
| CN111030499A (en) * | 2019-12-28 | 2020-04-17 | 深圳鹏城新能科技有限公司 | Split-phase inverter circuit |
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| CN115133803A (en) * | 2022-06-22 | 2022-09-30 | 许昌开普检测研究院股份有限公司 | Pulse width modulation method and device suitable for fault ride-through of new energy grid-connected inverter |
| CN115224740A (en) * | 2022-09-19 | 2022-10-21 | 深圳鹏城新能科技有限公司 | Inverter with split-phase and multi-mode single-phase output switching and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8937822B2 (en) * | 2011-05-08 | 2015-01-20 | Paul Wilkinson Dent | Solar energy conversion and utilization system |
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- 2022-12-27 CN CN202211683634.2A patent/CN115954938B/en active Active
Patent Citations (6)
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| CN103312205A (en) * | 2013-06-28 | 2013-09-18 | 石家庄通合电子科技股份有限公司 | Non-transformer single-phase grid-connected inverter control method |
| CN203301393U (en) * | 2013-06-28 | 2013-11-20 | 石家庄通合电子科技股份有限公司 | Non transformer single-phase grid connected inverter |
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| CN114744901A (en) * | 2022-04-15 | 2022-07-12 | 万帮数字能源股份有限公司 | High-efficiency non-isolated split-phase inverter and control method thereof |
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