CN111416420A - Super capacitor pre-charging circuit, dynamic voltage restorer and power system - Google Patents
Super capacitor pre-charging circuit, dynamic voltage restorer and power system Download PDFInfo
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- CN111416420A CN111416420A CN202010402217.0A CN202010402217A CN111416420A CN 111416420 A CN111416420 A CN 111416420A CN 202010402217 A CN202010402217 A CN 202010402217A CN 111416420 A CN111416420 A CN 111416420A
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- capacitor
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- dynamic voltage
- super capacitor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a super capacitor pre-charging circuit, a dynamic voltage restorer and an electric power system. According to the invention, the charging circuit is formed by the charging capacitor and the rectifier bridge and is connected with the super capacitor in series, so that the super capacitor can be rapidly charged, and the super capacitor has the advantages of low loss, small volume and basically no heat generation.
Description
Technical Field
The invention relates to a dynamic voltage restorer technology, in particular to a super capacitor pre-charging circuit, a dynamic voltage restorer and a power system.
Background
The capacitance capacity of the super capacitor in a Dynamic Voltage Restorer (DVR) is large, for example, a DVR of the order of 300kw requires a minimum of 10 farad super capacitor, and therefore, it is slower to power up when precharging the super capacitor. The existing pre-charging technology for the super capacitor mainly comprises two technologies, namely, a charger using a switching power supply technology is used for carrying out constant-current charging on the super capacitor, and resistance current-limiting charging is used after power grid rectification.
The charger using the switching power supply technology has the following disadvantages: for a 400V power grid system, a super capacitor needs to be charged to about 640V to work, so that a high-voltage switching power supply with the voltage of more than 640V is needed, if the current reaches 30A, a charger with the voltage of about 20kw is needed, and the charger is large in size, too complex in power electronic circuit technology, low in reliability and not matched with the requirement of high reliability of the integral DVR device.
The current-limiting charging scheme of the rectifier resistor has the following defects: in order to achieve rapid charging, the method needs to use a resistor with a large volume, has high loss and serious heating, causes energy waste, and also needs to be provided with a special high-power fan for heat dissipation.
Therefore, how to provide a fast charging technique for a super capacitor becomes a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a super capacitor pre-charging circuit capable of quickly pre-charging a super capacitor.
Another objective of the present invention is to provide a dynamic voltage restorer and a power system including the precharge circuit.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
According to an aspect of the present invention, a super capacitor pre-charging circuit is provided, which includes a charging capacitor and a rectifier bridge connected in series, an input terminal of the charging capacitor is connected to a power supply, an output terminal of the charging capacitor is connected to an input terminal of the rectifier bridge, an output terminal of the rectifier bridge is connected to an input terminal of the super capacitor, and the charging capacitor is a non-polar capacitor.
In an embodiment, the super capacitor pre-charge circuit further includes a charge switch, and the charge switch is connected between the power supply and the input end of the non-polar capacitor.
In an embodiment, the charging switch of the super capacitor pre-charging circuit is a thyristor switch.
In an embodiment, the charging capacitor of the super capacitor pre-charging circuit is a thin film capacitor.
According to another aspect of the present invention, a dynamic voltage restorer is provided, which includes the super capacitor pre-charging circuit described in any of the above embodiments, and further includes a super capacitor, an inverter unit, and a switch, an input end of the switch is connected to a power supply, an output end of the switch is connected to a load, the super capacitor pre-charging circuit, the super capacitor, and the inverter unit are connected in series and then are integrally connected in parallel to the switch, and the switch is a thyristor switch.
In an embodiment, the dynamic voltage restorer further comprises a circuit breaker for controlling the whole dynamic voltage restorer to be switched on and off, and the circuit breaker is connected between the selector switch and the power supply.
According to a further aspect of the present invention, there is provided a power system comprising the dynamic voltage restorer according to any one of the above embodiments, further comprising a grid and a load, the dynamic voltage restorer being connected between the grid and the load.
In an embodiment, the grid of the power system comprises a neutral line, which is connected to a neutral point of the supercapacitor.
The embodiment of the pre-charging circuit has the advantages that: the charging circuit is formed by the charging capacitor and the rectifier bridge and is connected with the super capacitor in series, so that the super capacitor can be charged quickly, and the super capacitor is small in loss, small in size and basically free of heat.
The dynamic voltage restorer and the power system have the same technical effects due to the fact that the pre-charging circuit is included.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
FIG. 1 is a block circuit diagram of an embodiment of the power system of the present invention;
wherein: 1-a supercapacitor precharge circuit; 2-a super capacitor; 3-an inversion unit; 4-a diverter switch; 5-dynamic voltage restorer; 6-a circuit breaker; 7-load; 8-a power grid; 11-a charging capacitor; 12-a rectifier bridge; 13-charging switch.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a super capacitor pre-charging circuit 1, which includes a charging capacitor 11 and a rectifier bridge 12 connected in series, an input end of the charging capacitor 11 is connected to a power supply, an output end of the charging capacitor 11 is connected to an input end of the rectifier bridge 12, and an output end of the rectifier bridge 12 is connected to an input end of a super capacitor 2. The rectifier bridge 12 is used to convert alternating current to direct current. The charging capacitor 11 should be a non-polar capacitor.
When the super capacitor 2 is precharged, the initial voltage of the super capacitor 2 is 0V, which is regarded as a short circuit, so the initial current during charging is i 2 × pi × f × C1 × u, where f and u are constants related to a power supply, generally f is 50Hz, u is 220V, and C1 is the capacity of the charging capacitor 11.
This precharge circuit can realize the quick charge to super capacitor 2, compares in the resistor or the switching power supply charging scheme among the prior art, and this precharge circuit of super capacitor 1 charge speed is fast, and the loss is little, small and basically not generate heat.
In a possible embodiment, the super capacitor pre-charging circuit 1 further comprises a charging switch 13 for controlling the circuit to be switched on and off, and the charging switch 13 is connected between the power supply and the input end of the charging capacitor 11. The charging switch 13 is preferably a Silicon Controlled Rectifier (SCR) switch, which can prevent current surge when the line is closed, and realize controllable rectification.
It should be noted that the charging capacitor 11 in the embodiment shown in fig. 1 is a film capacitor, and a common non-polar capacitor such as a dacron capacitor may be used as long as a sufficient withstand voltage is ensured. However, a polar capacitor such as an electrolytic capacitor cannot be used.
Further, the invention also discloses a dynamic voltage restorer 5, which comprises the super capacitor pre-charging circuit 1 in any embodiment, the super capacitor 2, the inversion unit 3 and the change-over switch 4, wherein the input end of the change-over switch 4 is connected with a power supply (namely a three-phase power grid 8 in the embodiment), the output end of the change-over switch 4 is connected with a load 7, and the whole super capacitor pre-charging circuit 1, the super capacitor 2 and the inversion unit 3 are connected in parallel with the change-over switch 4 after being connected in series. The inverter unit 3 may include a plurality of inverters of a three-phase three-wire system half-bridge structure, a three-phase four-leg structure, or an H-bridge structure independent of each phase, which is the prior art and thus will not be described again. The change-over switch 4 is a thyristor switch to ensure that the voltage sag/rise is detected in time and compensated in place. The compensation process of the dynamic voltage restorer 5 is as follows: when a voltage dip/rise is detected, the change-over switch 4 is turned off, and the load 7 is supplied with power from the super capacitor 2 through the inverter unit 3.
In a possible embodiment, the dynamic voltage restorer 5 further comprises a circuit breaker 6 for controlling the switching of the entire dynamic voltage restorer 5, the circuit breaker 6 being connected between the diverter switch 4 and the power grid 8.
It is easy to understand that the embodiment of the present invention also discloses an electric power system, which includes the dynamic voltage restorer 5 in any of the above embodiments, and further includes a power grid 8 and a load 7, and the dynamic voltage restorer 5 is connected between the power grid 8 and the load 7.
Depending on the form of the grid 8, when the grid 8 comprises a neutral line (i.e. N-line), the N-line should be connected to the neutral point (i.e. at half the voltage) of the supercapacitor 2.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only a preferred example of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (8)
1. A super capacitor pre-charging circuit is characterized in that: the charging capacitor and the rectifier bridge are connected in series, the input end of the charging capacitor is connected with a power supply, the output end of the charging capacitor is connected with the input end of the rectifier bridge, the output end of the rectifier bridge is connected with the input end of the super capacitor, and the charging capacitor is a non-polar capacitor.
2. The supercapacitor precharge circuit according to claim 1, wherein: the charging switch is connected between the power supply and the input end of the charging capacitor.
3. The supercapacitor precharge circuit according to claim 2, wherein: the charging switch is a silicon controlled switch.
4. The supercapacitor precharge circuit according to claim 1, wherein: the charging capacitor is a thin film capacitor.
5. A dynamic voltage restorer, characterized by: the super-capacitor pre-charging circuit comprises the super-capacitor pre-charging circuit as claimed in any one of claims 1 to 4, and further comprises a super-capacitor, an inversion unit and a change-over switch, wherein an input end of the change-over switch is connected with a power supply, an output end of the change-over switch is connected with a load, the super-capacitor pre-charging circuit, the super-capacitor and the inversion unit are connected in series and then are integrally connected with the change-over switch in parallel, and the change-over switch is a silicon.
6. Dynamic voltage restorer according to claim 5, characterized in that: the dynamic voltage restorer is characterized by further comprising a circuit breaker used for controlling the whole dynamic voltage restorer to be switched on and off, and the circuit breaker is connected between the selector switch and the power supply.
7. An electrical power system, characterized by: comprising a dynamic voltage restorer according to any of claims 5-6, further comprising a grid and a load, the dynamic voltage restorer being connected between the grid and the load.
8. The power system of claim 7, wherein: the power grid comprises a neutral line, and the neutral line is connected to a neutral point of the super capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010402217.0A CN111416420A (en) | 2020-05-13 | 2020-05-13 | Super capacitor pre-charging circuit, dynamic voltage restorer and power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010402217.0A CN111416420A (en) | 2020-05-13 | 2020-05-13 | Super capacitor pre-charging circuit, dynamic voltage restorer and power system |
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| Publication Number | Publication Date |
|---|---|
| CN111416420A true CN111416420A (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010402217.0A Pending CN111416420A (en) | 2020-05-13 | 2020-05-13 | Super capacitor pre-charging circuit, dynamic voltage restorer and power system |
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| Country | Link |
|---|---|
| CN (1) | CN111416420A (en) |
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2020
- 2020-05-13 CN CN202010402217.0A patent/CN111416420A/en active Pending
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