CN105244915B - Crowbar circuit for low-voltage ride through of double-fed wind power converter - Google Patents
Crowbar circuit for low-voltage ride through of double-fed wind power converter Download PDFInfo
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- CN105244915B CN105244915B CN201510746024.6A CN201510746024A CN105244915B CN 105244915 B CN105244915 B CN 105244915B CN 201510746024 A CN201510746024 A CN 201510746024A CN 105244915 B CN105244915 B CN 105244915B
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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
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- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a Crowbar circuit for low voltage ride through of a double-fed wind power converter, which comprises a rectifying circuit, a direct current support capacitor, a switching circuit, an energy release circuit, a charging circuit and a converter direct current bus bar, wherein the input end of the rectifying circuit is connected with three phases of a rotor winding of a double-fed generator, the direct current support capacitor is connected with the output end of the rectifying circuit in parallel, one end of the charging circuit is connected with the direct current support capacitor in parallel, the other end of the charging circuit is connected with the converter direct current bus bar in parallel, and the switching circuit is connected with the energy release circuit in series and then connected with the direct current support capacitor in parallel. According to the Crowbar circuit for the low voltage ride through of the double-fed wind power converter, the charging loop is added through an innovative circuit, so that high-frequency current generated on a rectifier diode when the rotor side of the converter is started is within a safe allowable range, and the reliability of the whole Crowbar circuit is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a Crowbar circuit for low-voltage ride through of a double-fed wind power converter.
Background
Wind energy in renewable energy sources is new energy which is developed fastest and has the largest installed capacity in recent years, and the mutual influence between a power grid and a wind generating set is more obvious along with the increase of the grid-connected quantity of the wind generating set. When a power grid fails and grid voltage drops, the stator flux linkage of the doubly-fed wind driven generator cannot be suddenly changed, so that direct-current components and zero-sequence components can appear in the stator voltage, and large slip can be generated relative to a rotor, so that overvoltage and overcurrent phenomena can be generated on a rotor side winding of the doubly-fed wind driven generator.
Overvoltage and overcurrent on the rotor side of the doubly-fed wind generator can damage the rotor side of the converter and a motor rotor winding, so that a Crowbar device (Crowbar device) is required to be installed in order to protect the rotor side of the converter and the motor rotor winding during grid fault and enable the doubly-fed wind power converter to have low voltage ride through capability.
The current transformer used by the wind generating set newly installed and connected to the grid is provided with an active Crowbar device, basically can meet the requirement of low voltage crossing a new national standard, but has certain defects in the aspects of protection and reliability of the current transformer. The domestic active Crowbar mostly adopts a circuit structure shown in fig. 1 (patent application publication number CN 103986341A): the structure has the advantages that the main circuit is simple in topology, the turn-off overvoltage can be effectively inhibited through the direct-current supporting capacitor, and meanwhile, a conventional withstand voltage power switch device can be selected, so that the difficulty in model selection and the cost are reduced.
In the actual use process of the active Crowbar shown in fig. 1, the disadvantage is that the intermediate energy storage capacitor of the Crowbar is charged at the moment of starting the rotor side of the wind power converter, the high-frequency rectification process occurs on the rectifier diodes in the three-phase uncontrollable rectifier bridge UR, and the off recovery performance of the rectifier diodes is poor at high frequency, so that the rectifier diodes pass through large high-frequency current to quickly accumulate heat, the reliability and the service life of the rectifier diodes are quickly reduced, the rectifier diodes are directly burned out when the rectifier diodes are serious, and the high-frequency rectification can be normally completed by selecting the fast recovery diodes.
Disclosure of Invention
The invention aims to improve a circuit aiming at the defects of the existing active Crowbar circuit and provide a high-reliability Crowbar circuit.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the Crowbar circuit for low voltage ride through of the double-fed wind power converter comprises a rectifying circuit, a direct-current supporting capacitor, a switching circuit, an energy discharge circuit, a charging circuit and a converter direct-current busbar, wherein the input end of the rectifying circuit is connected with three phases of a rotor winding of a double-fed generator, the direct-current supporting capacitor is connected in parallel with the output end of the rectifying circuit, one end of the charging circuit is connected with the direct-current supporting capacitor in parallel, the other end of the charging circuit is connected with the converter direct-current busbar in parallel, and the switching circuit is connected with the energy discharge circuit in series and then connected with the direct-current supporting capacitor in parallel.
As a preferred embodiment of the present invention, the charging circuit includes a diode, a first resistor, and a second resistor, where after the diode and the first resistor are connected in series, one end of the diode is connected to the positive electrode of the dc support capacitor, the other end of the diode is connected to the positive electrode of the dc bus, one end of the second resistor is connected to the negative electrode of the dc support capacitor, and the other end of the second resistor is connected to the negative electrode of the dc bus.
In a preferred embodiment of the present invention, the positive electrode of the diode is connected to the first resistor, and the negative electrode of the diode is connected to the positive electrode of the dc support capacitor.
As a preferred embodiment of the present invention, the positive electrode of the diode is connected to the positive electrode of the dc bus bar of the converter, and the negative electrode of the diode is connected to the first resistor.
In a preferred embodiment of the present invention, the switching circuit employs an IGBT power transistor.
As a preferred embodiment of the present invention, the energy discharge circuit includes a freewheeling diode and an energy discharge resistor connected in parallel.
As a preferred embodiment of the present invention, the Crowbar circuit further includes a discharge resistor, and the discharge resistor is connected in parallel with the dc support capacitor.
In a preferred embodiment of the present invention, the rectifier circuit is a three-phase uncontrollable rectifier bridge.
Compared with the prior art, the invention has the following beneficial effects: according to the Crowbar circuit for the low voltage ride through of the double-fed wind power converter, the charging loop is added through an innovative circuit, so that high-frequency current generated on a rectifier diode when the rotor side of the converter is started is within a safe allowable range, and the reliability of the whole Crowbar circuit is improved.
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 description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art circuit;
FIG. 2 is a schematic circuit diagram of embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a doubly-fed wind turbine generator system;
fig. 4 is a schematic circuit diagram according to embodiment 2 of the present invention.
Reference numerals: 201. a rectifier circuit 202 and a switch circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 to 4, a Crowbar circuit for low voltage ride through of a doubly-fed wind power converter comprises a rectifying circuit (a three-phase uncontrollable rectifying bridge UR), a direct-current supporting capacitor C, a switching circuit, an energy discharge circuit, a charging circuit CC and a converter direct-current busbar, wherein an input end of the rectifying circuit is connected with three phases of a rotor winding of a doubly-fed generator, the direct-current supporting capacitor C is connected in parallel with an output end of the rectifying circuit, one end of the charging circuit CC is connected with the direct-current supporting capacitor C in parallel, the other end of the charging circuit CC is connected with the converter direct-current busbar in parallel, and the switching circuit is connected with the energy discharge circuit in series and then.
In this embodiment, the Crowbar circuit further includes a discharge resistor R1, and the discharge resistor R1 is connected in parallel with the dc support capacitor C.
In the present embodiment, the switching circuit employs an IGBT (insulated gate bipolar transistor) power transistor.
In the present embodiment, the energy discharge circuit includes a freewheeling diode D1 and an energy discharge resistor R2 connected in parallel.
In this embodiment, the rectifying circuit is a three-phase uncontrollable rectifying bridge UR (including 6 rectifying diodes).
In this embodiment, the charging circuit includes a diode D2, a first resistor R3, and a second resistor R4, after the diode D2 and the first resistor R3 are connected in series, one end of the diode D2 is connected to the positive electrode of the dc support capacitor C, the other end of the diode D2 is connected to the positive electrode of the dc bus bar of the converter, one end of the second resistor R4 is connected to the negative electrode of the dc support capacitor C, and the other end of the resistor R4 is connected to the negative electrode.
As shown in fig. 2, the anode of the diode D2 is connected to the first resistor R3, and the cathode of the diode D2 is connected to the anode of the dc support capacitor C.
In this embodiment, the dc support capacitor C, the discharge resistor R1, the charging circuit CC (including resistors R3, R4 and diode D2), the insulated gate bipolar transistor IGBT, the energy release resistor R2, and the freewheeling diode D1, where: the input end of the three-phase uncontrollable rectifier bridge UR is connected with the three phases of the rotor winding of the doubly-fed generator and is used for converting alternating current electric energy output by the rotor winding into direct current electric energy; the direct current support capacitor C is connected in parallel between the output ends of the three-phase uncontrollable bridge rectifier bridge UR and used for reducing the turn-off overvoltage of the switching circuit; the discharge resistor R1 is connected in parallel at two ends of the direct current support capacitor C and is used for discharging energy on the direct current support capacitor C; one line of the charging circuit CC starts from Ud +, is connected with one end of a resistor R3, is connected to the anode of a diode D2 through the other end of a resistor R3, is connected to DC + from the cathode of the diode D2, and starts from Ud-, is connected with one end of a resistor R4 and is connected to DC-through the other end of a resistor R4, and the charging circuit is used for charging a direct current supporting capacitor C and reducing high-frequency current flowing through rectifier diodes on a three-phase uncontrollable rectifier bridge UR when the rotor side of the wind power converter is started; the collector of the insulated gate bipolar transistor IGBT is connected with DC +, the emitter is connected with EK, and the insulated gate bipolar transistor IGBT receives an instruction according to the overvoltage and overcurrent states of the rotor side to switch the on-off state; the energy release resistor R2 is connected with the freewheeling diode D1 in parallel and used for converting the energy on the rotor side into heat energy and releasing the heat energy; the anode of the freewheeling diode D1 is connected to DC-and the cathode is connected to EK for freewheeling after the IGBT is switched off.
In this embodiment, the resistors R3 and R4 in the charging circuit CC may be one, or may be formed by connecting two or more resistors arbitrarily; the positions of the resistor R3 and the diode D2 can be interchanged; the position of the insulated gate bipolar transistor IGBT and the position of the whole formed by the energy release resistor R2 and the freewheeling diode D1 can be interchanged; the insulated gate bipolar transistor IGBT and the freewheeling diode D1 can be formed by one or more parallel connection modes, wherein the insulated gate bipolar transistor IGBT can be replaced by other power switch devices capable of achieving the same function; the discharge resistor R1 and the energy discharge resistor R2 can be one, or can be formed by connecting two or more resistors randomly; the capacitance C may be formed by one or more arbitrary connections.
In the embodiment, before the rotor side of the wind power converter is started, the direct current support capacitor C is charged and stored with energy through the charging circuit CC, and the charging is stopped when the voltage of the direct current support capacitor C reaches a set value; when the voltage on the direct-current busbar of the converter is higher than the voltage on the direct-current support capacitor C, the converter can automatically charge the direct-current support capacitor C until the direct-current support capacitor C cannot be recharged.
In the embodiment, in the operation process of the double-fed wind generating set, when the grid voltage has a drop fault, a control system in the double-fed wind generating set can send a signal after determining that a low-voltage fault state occurs, so that Crowbar is quickly switched into a rotor winding loop of the double-fed wind generating set, an Insulated Gate Bipolar Transistor (IGBT) is quickly switched on, and the energy on the rotor side is directly and quickly released through an energy release resistor R2; when the rotor current or the Crowbar direct current voltage reaches a set safety range, the control system sends a Crowbar cut-out signal, and the Crowbar is quickly cut out. And meanwhile, if the direct current voltage of the converter is higher than the voltage at the two ends of the support capacitor C, the converter can be automatically charged, so that the voltage on the direct current support capacitor C keeps a certain value.
The invention adopts the direct current support capacitor to absorb the overvoltage generated when the power switch device is turned off, and has simple absorption circuit and few devices.
The Crowbar direct current supporting capacitor is charged, and then the rotor side of the converter is started, so that the high-frequency current value flowing through the rectifier diode is reduced, the requirement on the rectifier diode is lowered, and the reliability of the whole Crowbar circuit is improved.
According to the invention, energy can only flow from the direct current side of the converter to the direct current side of the Crowbar circuit through the diode, and the energy is not allowed to flow back to the direct current side of the converter, so that the high-frequency current value generated on the rectifier diode is reduced, and the rectifier diode in the three-phase uncontrollable rectifier bridge UR is protected.
Example 2
Other conditions of example 2 were the same as those of example 1, except that:
as shown in fig. 4, the anode of the diode D2 is connected to the anode of the dc bus bar of the converter, and the cathode of the diode D2 is connected to the first resistor R3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (2)
1. A Crowbar circuit for low voltage ride through of a double-fed wind power converter is characterized by comprising a rectifying circuit, a direct current support capacitor, a switching circuit, an energy release circuit, a charging circuit and a converter direct current busbar, wherein the input end of the rectifying circuit is connected with three phases of a rotor winding of a double-fed generator, the direct current support capacitor is connected with the output end of the rectifying circuit in parallel, one end of the charging circuit is connected with the direct current support capacitor in parallel, the other end of the charging circuit is connected with the converter direct current busbar in parallel, and the switching circuit is connected with the energy release circuit in series and then connected with the direct current support capacitor in parallel;
the charging circuit comprises a diode, a first resistor and a second resistor, wherein after the diode is connected with the first resistor in series, one end of the diode is connected with the positive electrode of the direct-current support capacitor, the other end of the diode is connected with the positive electrode of the direct-current support capacitor, one end of the second resistor is connected with the negative electrode of the direct-current support capacitor, and the other end of the second resistor is connected with the negative electrode of the direct-current support capacitor; the anode of the diode is connected with the first resistor, and the cathode of the diode is connected with the anode of the direct current support capacitor; the anode of the diode is connected with the anode of the direct-current busbar of the converter, and the cathode of the diode is connected with the first resistor;
the switching circuit adopts an IGBT power tube; the energy release circuit comprises a freewheeling diode and an energy release resistor which are connected in parallel; the Crowbar circuit further comprises a discharge resistor, and the discharge resistor is connected with the direct current support capacitor in parallel.
2. The Crowbar circuit for the low voltage ride through of the doubly-fed wind power converter as claimed in claim 1, wherein said rectifier circuit is a three-phase uncontrollable rectifier bridge.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510746024.6A CN105244915B (en) | 2015-11-06 | 2015-11-06 | Crowbar circuit for low-voltage ride through of double-fed wind power converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510746024.6A CN105244915B (en) | 2015-11-06 | 2015-11-06 | Crowbar circuit for low-voltage ride through of double-fed wind power converter |
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| CN105244915A CN105244915A (en) | 2016-01-13 |
| CN105244915B true CN105244915B (en) | 2020-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510746024.6A Active CN105244915B (en) | 2015-11-06 | 2015-11-06 | Crowbar circuit for low-voltage ride through of double-fed wind power converter |
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| CN113285519A (en) * | 2021-04-27 | 2021-08-20 | 北京城建智控科技有限公司 | High-reliability power supply circuit topology with redundancy design |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790404A (en) * | 2012-07-31 | 2012-11-21 | 许继集团有限公司 | Doubly-fed wind generation set with low-voltage ride-through function |
| CN103441504A (en) * | 2013-08-15 | 2013-12-11 | 东南大学 | Series compensation low-voltage ride-through device with self-charging function and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008154334A (en) * | 2006-12-15 | 2008-07-03 | Matsushita Electric Ind Co Ltd | Power conditioner |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790404A (en) * | 2012-07-31 | 2012-11-21 | 许继集团有限公司 | Doubly-fed wind generation set with low-voltage ride-through function |
| CN103441504A (en) * | 2013-08-15 | 2013-12-11 | 东南大学 | Series compensation low-voltage ride-through device with self-charging function and control method thereof |
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| CN105244915A (en) | 2016-01-13 |
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