CN220382770U - Novel static reactive compensator based on single-phase cascading three-level bridgeless circuit - Google Patents
Novel static reactive compensator based on single-phase cascading three-level bridgeless circuit Download PDFInfo
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Abstract
The utility model discloses a novel static reactive compensator based on a single-phase cascade three-level bridgeless circuit, which comprises a single-phase main power circuit formed by cascading a plurality of module units and a plurality of branches connected with the main power circuit in parallel and formed by connecting an inductor and a capacitor in series. The advantages are that: the novel static var compensator has the advantages of high SVG dynamic response speed, low harmonic content, low device power consumption, small volume, light weight, simple SVC control and low price. The novel static reactive compensator is formed based on a three-level bridgeless circuit for unidirectional energy transmission, a plurality of branches which are formed by connecting inductors and capacitors in series are connected in parallel with the cascaded three-level bridgeless circuit, so that advanced fundamental reactive power can be provided, low-order harmonics can be filtered, continuous adjustable reactive power can be provided for a system by controlling input current of the single-phase cascaded three-level bridgeless circuit, and power grid current harmonics can be restrained or eliminated.
Description
Technical Field
The utility model relates to a novel construction method of a static reactive compensator of a power system, belonging to the technical field of dynamic reactive compensation control in the electric energy quality control technology.
Background
The research on harmonic suppression and reactive compensation devices has become one of the most important research fields in the current electrical engineering field, and the electric energy quality control devices have the recognized functions of improving the power factors of a power supply system and a load, reducing the capacity of equipment, reducing the power loss, stabilizing the voltage of a power receiving end and a power grid and improving the power supply quality.
According to different connection modes, the power system compensation can be divided into three types of parallel compensation, series compensation and series-parallel hybrid compensation, wherein the parallel compensation is most widely applied in a power system due to convenient access and excision. Typical devices that are currently most commonly used in parallel compensation applications to enable continuous dynamic compensation of reactive power in an electrical power system are static var compensators and static var generators. The static var compensator has the advantages that: continuous compensation can be realized, split-phase adjustment can be realized, the operation is reliable, the control is simple, and the price is low; the main disadvantages are: a large number of harmonics are generated, a filter device is necessary to be added in use, and the reactor is large and heavy. Compared with a static reactive compensator, the static reactive generator is composed of a fully-controlled power electronic device, adopts a modern power electronic technology, can effectively inhibit harmonic waves of a power grid while realizing continuous dynamic reactive compensation, and has the advantages of higher dynamic response speed, stronger voltage flicker inhibition capability, less harmonic content, low device power consumption, small volume, light weight and the like, and the main defects are that: expensive and complicated to control. From the above, two typical parallel compensation devices that are conventionally used and capable of continuously and dynamically compensating reactive power in an electric power system have disadvantages.
The utility model aims to provide a novel static var compensator circuit which has the advantages of the two parallel compensation devices. The novel static reactive compensator circuit is composed of a three-level bridgeless circuit with energy transmitted in one direction, and can adopt a proper control strategy for a single-phase parallel compensator circuit to control the input current of a controllable rectifier to run in advance or in delay of the phase of the input power supply voltage, and continuously adjustable reactive power is provided for the system through the cooperation of the controllable rectifier and a capacitor, and meanwhile, the harmonic wave of a power grid is restrained. In the novel static reactive compensator circuit, the three-level bridgeless circuit for unidirectional energy transmission is connected with a plurality of branches of which the capacitors are connected with the inductors in series, the branches of which the capacitors are connected with the inductors in series can not only provide advanced fundamental reactive power, but also filter low-order harmonic waves, and the purpose of providing continuously adjustable reactive power for the system can be achieved by controlling the phase of the input current of the three-level bridgeless circuit for unidirectional energy transmission relative to the voltage of a power grid. The purpose of restraining or eliminating the harmonic wave of the power grid current can be achieved by controlling the three-level bridgeless circuit for unidirectional energy transmission to generate harmonic compensation current which is equal to the harmonic current of the power grid and opposite in polarity.
For the three-level bridgeless circuit, the three-level bridgeless circuit is mainly used as a unit power factor rectifier in industry so far, when an input current runs in a phase leading or lagging an input power supply voltage, the input current inevitably generates zero crossing distortion so as to lead the current THD to be increased. The novel static var compensator provided by the utility model has the advantages of high dynamic response speed, low harmonic content, low device power consumption, small volume, light weight and the like of the static var generator, and also has the advantages of simple control and low price of the traditional static var compensator.
Disclosure of Invention
In order to achieve the above object, the utility model provides a novel static var compensator based on a single-phase cascading three-level bridgeless circuit, which comprises a main power circuit, wherein the main power circuit comprises an input inductor (L) and N three-level bridgeless circuits, N is a positive integer, the three-level bridgeless circuits adopt a combined bridge (A), and the combined bridge (A) comprises a plurality of common diodes (D 1 、D 2 ) Two clamp diodes (D) p 、D n ) And four switching devices (S 1 、S 2 、S 3 、S 4 ) Bridge circuit, two output DC capacitors (C 0 、C 1 ) And a load (R), said common diode (D 1 ) Is connected with the common diode (D 2 ) Is positioned on the same bridge arm, the common diode (D 1 ) Is connected to the anode of the normal diode (D 2 ) Is connected to the cathode of the common diode (D 1 ) And the cathode of the switching device (S 1 ) A first terminal (p) of (C), an output dc capacitance (C) 0 ) Is connected to the first terminal (p) of the load (R), said common diode (D 2 ) Is connected to the anode of the switching device (S 4 ) A second terminal (n) of (C), an output dc capacitance (C) 1 ) Is connected to the second terminal (n) of the load (R), said common diode (D 2 ) Is connected to a second input (b) of the combination bridge (A), the switching device (S 1 ) And the second terminal (n) of said (C)Switching device (S) 2 ) Is connected to the first terminal (p) of the clamp diode (D) p ) Is connected to the cathode of the switching device (S 2 ) Is connected to the first input (a) of the combination bridge (A) and to the switching device (S) 3 ) Is connected to the first terminal (p), the switching device (S 3 ) And the second terminal (n) of the switching device (S) 4 ) Is connected to the first terminal (p) of the clamp diode (D) n ) Is connected to the anode of the clamping diode (D p ) Is connected with the clamping diode (D n ) Cathode of (C) and output DC capacitor (C) 0 ) A second terminal (n) of (C) and an output DC capacitor (C) 1 ) Is connected to the first terminal (p); the main power circuit comprises N cascaded combined bridges (A), wherein a second input end (b) of each combined bridge (A) is sequentially connected with a first input end (a) of the next combined bridge (A), and the remaining two free ends of the cascaded combined bridges (A), namely the first input end (a) of the first combined bridge (A) and the second input end (b) of the Nth combined bridge (A), are connected in series through the input inductor (L) to be connected into an alternating current power grid; the main power circuit further comprises a power supply consisting of an inductor (L fk ) Capacitor (C) fk ) K filter branches are formed in series, wherein k is a positive integer, and the k filter branches are connected in parallel to an alternating current power grid.
The novel static reactive compensator based on the single-phase cascade three-level bridgeless circuit has the advantages and positive effects that: a novel static var compensator circuit is provided. In the novel static var compensator circuit, the three-level bridgeless rectifier for unidirectional energy transmission is connected with a plurality of branches of which the capacitors are connected with the inductors in series, the branches of which the capacitors are connected with the inductors in series can not only provide advanced fundamental reactive power, but also filter low-order harmonic waves, and the purpose of providing continuously adjustable reactive power for the system can be achieved by controlling the phase of input current of the single-phase cascaded three-level bridgeless rectifier for unidirectional energy transmission. The purpose of restraining or eliminating the harmonic wave of the power grid current can be achieved by controlling the single-phase cascade three-level bridgeless rectifier to generate harmonic compensation current which is equal to the harmonic current of the power grid and opposite in polarity. The novel static var compensator based on the single-phase cascade three-level bridgeless circuit has the advantages of high dynamic response speed, low harmonic content, low device power consumption, small volume, light weight and the like of the static var generator, and also has the advantages of simple control and low price of the traditional static var compensator.
The following will explain in detail embodiments with reference to the figures.
Drawings
FIG. 1 is a circuit diagram of a composite bridge (A) in the novel static var compensator based on a single-phase cascaded three-level bridgeless circuit of the present utility model;
fig. 2 is a circuit topology diagram of an embodiment of the novel static var compensator based on a single-phase cascade three-level bridgeless circuit of the present utility model.
Detailed Description
In the embodiment of the utility model based on the novel static var compensator of the single-phase cascade three-level bridgeless circuit, the novel static var compensator of the single-phase cascade three-level bridgeless circuit is formed by cascading a plurality of module units to form an integral circuit topology.
Referring to fig. 1 and 2, in an embodiment of the novel static var compensator based on a single-phase cascaded three-level bridgeless circuit of the present utility model, the main power circuit comprises k filter branches, an input inductance (L) and N combined bridges (a), where k, N are positive integers.
The combination bridge (A) comprises a bridge formed by two common diodes (D 1 、D 2 ) Two clamp diodes (D) p 、D n ) And four switching devices (S 1 、S 2 、S 3 、S 4 ) Bridge circuit, two output DC capacitors (C 0 、C 1 ) And a load (R), a common diode (D 1 ) With ordinary diode (D) 2 ) Is positioned on the same bridge arm, a common diode (D 1 ) Anode of (D) and general diode (D) 2 ) Is connected to the cathode of a common diode (D 1 ) Cathode and switching device (S) 1 ) A first terminal (p),Output DC capacitor (C) 0 ) Is connected to the first terminal (p) of the load (R), a common diode (D) 2 ) Anode and switching device (S) 4 ) A second terminal (n) of (C), an output dc capacitance (C) 1 ) Is connected to the second terminal (n) of the load (R), a common diode (D) 2 ) Is connected to the second input (b) of the combination bridge (A), and the switching device (S 1 ) And a switching device (S) 2 ) Is connected to the first terminal (p) of the clamp diode (D) p ) Is connected to the cathode of the switching device (S 2 ) A second terminal (n) of the combination bridge (A), a first input terminal (a) of the combination bridge (A) and a switching device (S) 3 ) Is connected to the first terminal (p), and the switching device (S 3 ) And a switching device (S) 4 ) Is connected to the first terminal (p) of the clamp diode (D) n ) Is connected to the anode of the clamp diode (D p ) Anode and clamping diode (D) n ) Cathode of (C) and output DC capacitor (C) 0 ) A second terminal (n) of (C) and an output DC capacitor (C) 1 ) Is connected to the first terminal (p); the main power circuit comprises N cascaded combination bridges (A), wherein the second input end (b) of each combination bridge (A) is sequentially connected with the first input end (a) of the next combination bridge (A), and the remaining two free ends of the cascaded combination bridges (A), namely the first input end (a) of the first combination bridge (A) and the second input end (b) of the Nth combination bridge (A), are connected in series through an input inductor (L) to an alternating current power grid.
Each of the k filter branches is formed by an inductance (L fk ) And a capacitor (C fk ) The k filter branches are connected in parallel to an alternating current power grid.
The novel static reactive compensator based on the single-phase cascade three-level bridgeless circuit has the advantages and positive effects that: a novel static var compensator circuit is provided. In the novel static var compensator circuit, the three-level bridgeless rectifier for unidirectional energy transmission is connected with a plurality of branches of which the capacitors are connected with the inductors in series, the branches of which the capacitors are connected with the inductors in series can not only provide advanced fundamental reactive power, but also filter low-order harmonic waves, and the purpose of providing continuously adjustable reactive power for the system can be achieved by controlling the phase of input current of the single-phase cascaded three-level bridgeless rectifier for unidirectional energy transmission. The purpose of restraining or eliminating the harmonic wave of the power grid current can be achieved by controlling the single-phase cascade three-level bridgeless rectifier to generate harmonic compensation current which is equal to the harmonic current of the power grid and opposite in polarity. The novel static var compensator based on the single-phase cascade three-level bridgeless circuit has the advantages of high dynamic response speed, low harmonic content, low device power consumption, small volume, light weight and the like of the static var generator, and also has the advantages of simple control and low price of the traditional static var compensator.
The above embodiments are merely illustrative of the preferred embodiments of the present utility model, and not intended to limit the spirit and scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope of the present utility model, and the technical content claimed by the present utility model is fully described in the claims.
Claims (1)
1. A novel static reactive compensator based on a single-phase cascading three-level bridgeless circuit comprises a main power circuit, wherein the main power circuit comprises an input inductor (L) and N three-level bridgeless circuits, N is a positive integer, the three-level bridgeless circuits adopt a combined bridge (A), and the combined bridge (A) comprises a plurality of common diodes (D 1 、D 2 ) Two clamp diodes (D) p 、D n ) And four switching devices (S 1 、S 2 、S 3 、S 4 ) Bridge circuit, two output DC capacitors (C 0 、C 1 ) And a load (R), said common diode (D 1 ) Is connected with the common diode (D 2 ) Is positioned on the same bridge arm, the common diode (D 1 ) Is connected to the anode of the normal diode (D 2 ) Is connected with the cathode of (a)Said common diode (D) 1 ) And the cathode of the switching device (S 1 ) A first terminal (p) of (C), an output dc capacitance (C) 0 ) Is connected to the first terminal (p) of the load (R), said common diode (D 2 ) Is connected to the anode of the switching device (S 4 ) A second terminal (n) of (C), an output dc capacitance (C) 1 ) Is connected to the second terminal (n) of the load (R), said common diode (D 2 ) Is connected to a second input (b) of the combination bridge (A), the switching device (S 1 ) And the second terminal (n) of the switching device (S) 2 ) Is connected to the first terminal (p) of the clamp diode (D) p ) Is connected to the cathode of the switching device (S 2 ) Is connected to the first input (a) of the combination bridge (A) and to the switching device (S) 3 ) Is connected to the first terminal (p), the switching device (S 3 ) And the second terminal (n) of the switching device (S) 4 ) Is connected to the first terminal (p) of the clamp diode (D) n ) Is connected to the anode of the clamping diode (D p ) Is connected with the clamping diode (D n ) Cathode of (C) and output DC capacitor (C) 0 ) A second terminal (n) of (C) and an output DC capacitor (C) 1 ) Is connected to the first terminal (p); the main power circuit comprises N cascaded combination bridges (A), wherein a second input end (b) of each combination bridge (A) is sequentially connected with a first input end (a) of the next combination bridge (A), and the remaining two free ends of the cascaded combination bridges (A), namely the first input end (a) of the first combination bridge (A) and the second input end (b) of the Nth combination bridge (A), are connected in series through the input inductor (L) to an alternating current power grid, and the main power circuit is characterized in that: the main power circuit further comprises a power supply consisting of an inductor (L fk ) Capacitor (C) fk ) K filter branches are formed in series, wherein k is a positive integer, and the k filter branches are connected in parallel to an alternating current power grid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321835659.XU CN220382770U (en) | 2023-07-13 | 2023-07-13 | Novel static reactive compensator based on single-phase cascading three-level bridgeless circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321835659.XU CN220382770U (en) | 2023-07-13 | 2023-07-13 | Novel static reactive compensator based on single-phase cascading three-level bridgeless circuit |
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