SVG voltage-sharing power taking device and power transmission system
By introducing a voltage equalization power supply module into the SVG device, the control module power loss caused by inconsistent DC voltage of the power module and the failure of a single module is solved, and the stable operation and safety guarantee of the SVG device are achieved.
Patent Information
- Application Number
- CN202422220042.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-10
AI Technical Summary
In the existing SVG devices, the control module only draws power from the DC end of one power module, resulting in inconsistent active losses of different power modules and inconsistent DC voltages. When the power module being withdrawn fails, the control module loses power, causing the SVG device to run paralyzed.
Using a voltage equalization power supply device, a voltage equalization power supply module is formed between each power module and the control module, including a first unidirectional piece and a second unidirectional piece, to form a power supply loop. The control module is powered by a power module with a high DC voltage, and the DC voltage of each power module is equalized through a one-way conduction characteristic.
The DC terminal voltage consistency of each power module is achieved, operating stability and safety are improved, and the control module power loss caused by a single module failure is prevented.
Smart Images
Figure CN223168224U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power equipment, in particular to an SVG voltage equalizing power taking device and a power transmission system. Background Art
[0002] SVG (Static Var Generator) is a commonly used device in new energy power stations such as wind power and photovoltaic power generation nowadays. In an SVG device, in order to improve the power density of power modules and further reduce the system cost, each power module may include a plurality of power units, the AC terminals of the plurality of power units are connected in series in sequence, and the control module may be respectively connected to the controlled terminals of the power units to control the operation of the power units, and the control module may take power from the DC terminal of any one of the power units to meet the power consumption requirements of the control module. However, the control module only takes power from the DC terminal of one power unit, resulting in inconsistent active power losses of different power units, directly leading to inconsistent DC voltages of the serially connected power units, and when the power unit from which power is taken fails, the control module loses power and the SVG device fails to operate. Content of the Utility Model
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides an SVG voltage equalizing power taking device and a power transmission system to ensure the consistency, operation stability and safety of the DC terminal voltage.
[0004] An SVG voltage equalizing power taking device according to an embodiment of the first aspect of the utility model includes: an SVG power module including a plurality of power units, the AC terminals of the plurality of power units are connected in series in sequence; a voltage equalizing power taking module including a plurality of voltage equalizing power taking units, each voltage equalizing power taking unit is provided corresponding to one of the power units, each voltage equalizing power taking unit includes a first one-way member and a second one-way member that are both unidirectionally conducting, the first one-way member and the second one-way member both conduct electricity from the conducting end to the cut-off end and cut off from the cut-off end to the conducting end, the conducting end of the first one-way member is connected to the positive pole of the DC terminal of the power unit, and the cut-off end of the second one-way member is connected to the negative pole of the DC terminal of the power unit; a control module, the control terminals of the control module are respectively connected to the controlled terminals of the respective power units, the cut-off ends of the respective first one-way members are connected and connected to the positive pole of the power supply terminal of the control module, and the conducting ends of the respective second one-way members are connected and connected to the negative pole of the power supply terminal of the control module.
[0005] An SVG voltage equalizing power taking device according to an embodiment of the utility model has at least the following beneficial effects:
[0006] The SVG voltage equalizing power extraction device of the present utility model, the control module can control the operation of each power module. The DC ends of each power module are connected to the control module through the first one-way component and the second one-way component in their respective voltage equalizing power extraction modules to form a power supply circuit. The control module is powered by the power module with a higher DC voltage. On the one hand, it powers the control module. On the other hand, during the power supply process, the DC voltage of the power module with a higher DC voltage decreases accordingly, balancing the DC voltages of each power module. And due to the one-way conduction characteristics of the first one-way component and the second one-way component, the voltages between the DC ends of each power module will not be affected. This design ensures the consistency, operation stability and safety of the DC end voltage.
[0007] According to some embodiments of the present utility model, the first one-way component and the second one-way component are diodes.
[0008] According to some embodiments of the present utility model, the power module includes a first switching tube of a semiconductor, a second switching tube of a semiconductor, a third switching tube of a semiconductor, and a fourth switching tube of a semiconductor. The input end of the first switching tube is respectively connected to the input end of the second switching tube and the conducting end of the first one-way component. The output end of the first switching tube is connected to the input end of the third switching tube and forms the first phase of the AC end of the power module. The output end of the second switching tube is connected to the input end of the fourth switching tube and forms the second phase of the AC end of the power module. The output end of the third switching tube is respectively connected to the output end of the fourth switching tube and the non-conducting end of the second one-way component.
[0009] According to some embodiments of the present utility model, the power module further includes a resistor R1. One end of the resistor R1 is connected to the conducting end of the first one-way component, and the other end of the resistor R1 is connected to the non-conducting end of the second one-way component.
[0010] According to some embodiments of the present utility model, the power module further includes a capacitor C1. One end of the capacitor C1 is connected to the conducting end of the first one-way component, and the other end of the capacitor C1 is connected to the non-conducting end of the second one-way component.
[0011] According to some embodiments of the present utility model, the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube are triodes, MOS tubes, IGBTs or thyristors.
[0012] According to some embodiments of the present utility model, there are two power modules, and the first phase of the AC end of one power module is connected to the second phase of the AC end of the other power module.
[0013] According to some embodiments of the present utility model, the power module further includes a bypass switch assembly. One end of the bypass switch assembly is connected to the first phase of the AC terminal of the power module, and the other end of the bypass switch assembly is connected to the second phase of the AC terminal of the power module.
[0014] According to some embodiments of the present utility model, the power module further includes a voltage detection unit. The voltage detection unit is connected to the DC terminal of the power module to detect the DC voltage. The control module is respectively connected to each of the voltage detection units and the bypass switch assembly to control the on / off of the bypass switch assembly according to the magnitude of the DC voltage.
[0015] According to the power transmission system of the second aspect embodiment of the present utility model, it includes an SVG voltage equalization power extraction device disclosed in any of the above embodiments.
[0016] According to the power transmission system of the embodiments of the present utility model, it has at least the following beneficial effects:
[0017] The power transmission system of the present utility model applies an SVG voltage equalization power extraction device to ensure the consistency, operation stability and safety of the DC terminal voltage.
[0018] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:
[0020] Figure 1 is the principle structure block diagram of one embodiment of the SVG voltage equalization power extraction device of the present utility model;
[0021] Figure 2 is the circuit schematic diagram of one embodiment of the SVG voltage equalization power extraction device of the present utility model;
[0022] Figure 3 is the circuit schematic diagram of one embodiment of the power module.
[0023] Reference numerals:
[0024] SVG power module 100; power module 110; first switching tube 111; second switching tube 112; third switching tube 113; fourth switching tube 114; voltage equalization power extraction module 200; first one-way member 210; second one-way member 220; control module 300; bypass switch assembly 400; voltage detection unit 500. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.
[0026] In the description of the present utility model, it should be understood that with regard to the orientation description, for example, terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the present utility model.
[0027] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the present number, and "above", "below", "within", etc. are understood as including the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.
[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0029] Such as Figures 1 - 3As shown in the figure, an SVG voltage equalizing and power taking device according to an embodiment of the first aspect of the present invention includes an SVG power module 100, a voltage equalizing and power taking module 200, and a control module 300. The SVG power module 100 includes a plurality of power modules 110. The AC ends of the plurality of power modules 110 are connected in series in sequence. The voltage equalizing and power taking module 200 includes a plurality of voltage equalizing and power taking modules. Each voltage equalizing and power taking module is arranged corresponding to one of the power modules 110. Each voltage equalizing and power taking module includes a first one-way component 210 and a second one-way component 220 that are both unidirectionally conductive. The first one-way component 210 and the second one-way component 220 both conduct electricity from the conduction end to the cut-off end and are cut off from the cut-off end to the conduction end. The conduction end of the first one-way component 210 is connected to the positive pole of the DC end of the power module 110, and the cut-off end of the second one-way component 220 is connected to the negative pole of the DC end of the power module 110. The control ends of the control module 300 are respectively connected to the controlled ends of each power module 110. The cut-off ends of each first one-way component 210 are connected and connected to the positive pole of the power supply end of the control module 300, and the conduction ends of each second one-way component 220 are connected and connected to the negative pole of the power supply end of the control module 300.
[0030] Among them, the control module 300 can be selected from a processor with a processing function such as an MCU or a CPU and its affiliated circuits. In some embodiments of the present invention, the first one-way component 210 and the second one-way component 220 are diodes. Generally speaking, when the first one-way component 210 and the second one-way component 220 are selected as diodes, the conduction ends of the first one-way component 210 and the second one-way component 220 are the positive poles of the diodes, and the cut-off ends of the first one-way component 210 and the second one-way component 220 are the negative poles of the diodes.
[0031] In some embodiments of the present invention, there are two power modules 110. The first phase of the AC end of one power module 110 is connected to the second phase of the AC end of the other power module 110, so as to improve the power density of the SVG power module 100 and reduce the cost of the SVG device.
[0032] The SVG voltage equalizing power extraction device of the present utility model, the control module 300 can control the operation of each power module 110. The DC ends of each power module 110 are connected to the control module 300 through the first one-way component 210 and the second one-way component 220 in their respective voltage equalizing power extraction modules to form a power supply loop. The control module 300 is powered by the power module 110 with a higher DC voltage. On the one hand, it powers the control module 300. On the other hand, during the power supply process, the DC voltage of the power module 110 with a higher DC voltage decreases accordingly, equalizing the DC voltages of each power module 110. Due to the one-way conduction characteristics of the first one-way component 210 and the second one-way component 220, the voltages between the DC ends of each power module 110 will not be affected. This design ensures the consistency, operation stability, and safety of the DC end voltage.
[0033] In some embodiments of the present utility model, the power module 110 includes a first switching tube 111 of a semiconductor, a second switching tube 112 of a semiconductor, a third switching tube 113 of a semiconductor, and a fourth switching tube 114 of a semiconductor. The input end of the first switching tube 111 is respectively connected to the input end of the second switching tube 112 and the conducting end of the first one-way component 210. The output end of the first switching tube 111 is connected to the input end of the third switching tube 113 and forms the first phase of the AC end of the power module 110. The output end of the second switching tube 112 is connected to the input end of the fourth switching tube 114 and forms the second phase of the AC end of the power module 110. The output end of the third switching tube 113 is respectively connected to the output end of the fourth switching tube 114 and the non-conducting end of the second one-way component 220.
[0034] The first switching tube 111 of a semiconductor, the second switching tube 112 of a semiconductor, the third switching tube 113 of a semiconductor, and the fourth switching tube 114 of a semiconductor form an H-bridge power module 110. The control module 300 controls the first switching tube 111, the second switching tube 112, the third switching tube 113, and the fourth switching tube 114 respectively to switch at least between a first working state and a second working state. In the first working state, the first switching tube 111 and the fourth switching tube 114 are conducting, and the second switching tube 112 and the third switching tube 113 are disconnected. In the second working state, the second switching tube 112 and the third switching tube 113 are conducting, and the first switching tube 111 and the fourth switching tube 114 are disconnected.
[0035] In some embodiments of the present utility model, the power module 110 further includes a capacitor C1. One end of the capacitor C1 is connected to the conducting end of the first one-way component 210, and the other end of the capacitor C1 is connected to the non-conducting end of the second one-way component 220.
[0036] The capacitor C1 serves as a charging capacitor, and the voltage at the DC end of the power module 110 is stored in the capacitor C1. During the power supply process, the electrical energy stored in the capacitor C1 can supply power to the load.
[0037] In some embodiments of the present invention, as Figure 2 、 3 shown, the power module 110 further includes a resistor R1. One end of the resistor R1 is connected to the conducting end of the first one-way component 210, and the other end of the resistor R1 is connected to the non-conducting end of the second one-way component 220. The resistor R1 serves as a discharge resistor and can discharge the electrical energy accumulated on the capacitor C1 in a timely manner when there is too much electrical energy, preventing the capacitor C1 from being damaged.
[0038] In some embodiments of the present invention, the first switching transistor 111, the second switching transistor 112, the third switching transistor 113, and the fourth switching transistor 114 are triodes, MOS transistors, IGBTs, or thyristors. Specifically, as Figure 2 、 3 shown, the first switching transistor 111, the second switching transistor 112, the third switching transistor 113, and the fourth switching transistor 114 can adopt IGBTs.
[0039] In some embodiments of the present invention, as Figure 2 、 3 shown, the power module 110 further includes a bypass switch assembly 400. One end of the bypass switch assembly 400 is connected to the first phase of the AC end of the power module 110, and the other end of the bypass switch assembly 400 is connected to the second phase of the AC end of the power module 110.
[0040] In the SVG power module 100, the AC ends of multiple power modules 110 are connected in series, and the DC ends of multiple power modules 110 are powered by a voltage equalizing power extraction module. When any one of the power modules 110 fails, the control module 300 can control the bypass switch assembly 400 to conduct, thereby short-circuiting the power module 110 and reducing the impact of the power module 110 on the SVG power module 100 and the power supply to the control module 300.
[0041] Specifically, the bypass switch assembly 400 can be a relay switch or a semiconductor switching transistor, etc.
[0042] In some embodiments of the present invention, as Figure 1 、 3As shown, the power module 110 further includes a voltage detection unit 500. The voltage detection unit 500 is connected to the DC terminal of the power module 110 to detect the DC voltage. The control module 300 is respectively connected to each of the voltage detection units 500 and the bypass switch assembly 400 to control the on / off of the bypass switch assembly 400 according to the magnitude of the DC voltage.
[0043] The voltage detection unit 500 can be selected from conventional voltage sampling circuits such as a resistive voltage division sampling circuit. The voltage detection unit 500 detects the magnitude of the DC voltage. When a fault occurs in the power module 110 and the DC voltage is abnormal, the control module 300 controls the bypass switch assembly 400 of the corresponding power module 110 to conduct, thereby removing the power module 110.
[0044] The power transmission system according to the second aspect embodiment of the present invention includes an SVG voltage equalization power extraction device disclosed in any of the above embodiments.
[0045] The power transmission system according to the embodiment of the present invention has at least the following beneficial effects:
[0046] The power transmission system of the present invention applies an SVG voltage equalization power extraction device to ensure the consistency, operation stability and safety of the DC terminal voltage.
[0047] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.
[0048] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the claims and their equivalents.
Claims
1. An SVG voltage equalizing power extraction device, characterized in that, Including: An SVG power module, including a plurality of power modules, and the AC terminals of the plurality of power modules are connected in series in sequence; A voltage equalizing power extraction module, including a plurality of voltage equalizing power extraction modules, each of the voltage equalizing power extraction modules is arranged corresponding to one of the power modules, and each of the voltage equalizing power extraction modules includes a first one-way component and a second one-way component that are both unidirectionally conducting. Both the first one-way component and the second one-way component conduct electricity from the conducting end to the cutoff end and cut off from the cutoff end to the conducting end. The conducting end of the first one-way component is connected to the positive pole of the DC terminal of the power module, and the cutoff end of the second one-way component is connected to the negative pole of the DC terminal of the power module; A control module, the control ends of the control module are respectively connected to the controlled ends of each power module, the cutoff ends of each of the first one-way components are connected and connected to the positive pole of the power supply end of the control module, and the conducting ends of each of the second one-way components are connected and connected to the negative pole of the power supply end of the control module.
2. The SVG voltage equalizing power extraction device according to claim 1, wherein: The first one-way component and the second one-way component are diodes.
3. The SVG voltage equalizing power taking device according to claim 1, characterized in that: The power module includes a first switching tube of a semiconductor, a second switching tube of a semiconductor, a third switching tube of a semiconductor, and a fourth switching tube of a semiconductor. The input end of the first switching tube is respectively connected to the input end of the second switching tube and the conducting end of the first one-way component. The output end of the first switching tube is connected to the input end of the third switching tube and forms the first phase of the AC terminal of the power module. The output end of the second switching tube is connected to the input end of the fourth switching tube and forms the second phase of the AC terminal of the power module. The output end of the third switching tube is respectively connected to the output end of the fourth switching tube and the cutoff end of the second one-way component.
4. The SVG voltage equalizing power taking device according to claim 3, characterized in that: The power module further includes a resistor R1, one end of the resistor R1 is connected to the conducting end of the first one-way component, and the other end of the resistor R1 is connected to the cutoff end of the second one-way component.
5. The SVG voltage equalizing power taking device according to claim 3, wherein: The power module further includes a capacitor C1, one end of the capacitor C1 is connected to the conducting end of the first one-way component, and the other end of the capacitor C1 is connected to the cutoff end of the second one-way component.
6. The SVG voltage equalizing power extraction device according to claim 3, characterized in that: The first switching tube, the second switching tube, the third switching tube, and the fourth switching tube are triodes, MOS tubes, IGBTs, or thyristors.
7. The SVG voltage equalizing power extraction device according to claim 3, characterized in that: There are two power modules, and the first phase of the AC terminal of one power module is connected to the second phase of the AC terminal of the other power module.
8. The SVG voltage equalizing power taking device according to claim 1, characterized in that: The power module further includes a bypass switch assembly, one end of the bypass switch assembly is connected to the first phase of the AC terminal of the power module, and the other end of the bypass switch assembly is connected to the second phase of the AC terminal of the power module.
9. The SVG voltage equalizing power extraction device according to claim 8, characterized in that: The power module further includes a voltage detection unit, the voltage detection unit is connected to the DC terminal of the power module to detect the DC voltage, and the control module is respectively connected to each of the voltage detection units and the bypass switch assembly to control the on / off of the bypass switch assembly according to the magnitude of the DC voltage.
10. A power transmission system, characterized in that, Including an SVG voltage equalizing power extraction device according to any one of claims 1 to 9.