CN209072336U - Brake circuit, the wind electric converter of wind electric converter - Google Patents
Brake circuit, the wind electric converter of wind electric converter Download PDFInfo
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- CN209072336U CN209072336U CN201822109786.7U CN201822109786U CN209072336U CN 209072336 U CN209072336 U CN 209072336U CN 201822109786 U CN201822109786 U CN 201822109786U CN 209072336 U CN209072336 U CN 209072336U
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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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The utility model discloses a kind of brake circuit of wind electric converter, wind electric converter, which includes: Support Capacitor, upper bridge arm unit, lower bridge arm unit, the first braking resistor module, the second braking resistor module and controller；The first end of Support Capacitor, the first end of upper bridge arm unit, the first end of the first braking resistor module are connect with the anode of the DC bus of current transformer；The second end of upper bridge arm unit, the second end of the first braking resistor module, the first end of lower bridge arm unit, the first end of the second braking resistor module are connect with the ac output end of current transformer；Second end, the second end of lower bridge arm unit, the second end of the second braking resistor module of Support Capacitor are connect with the negative terminal of DC bus；Controller is connect with the control terminal of the control terminal of upper bridge arm unit and lower bridge arm unit respectively.Upper bridge arm unit and lower bridge arm element resources in brake circuit can make full use of using the utility model embodiment, improve the stopping power of current transformer.
Description
Technical Field
The utility model relates to a wind power generation technical field especially relates to a braking circuit, wind-powered electricity generation converter of wind-powered electricity generation converter.
Background
The brake resistance in the brake loop of the wind power converter is the guarantee that the wind generating set has the power grid ride-through capability. When the voltage of the power grid fluctuates, such as high and low voltage ride through, the energy generated by the generator cannot be completely transmitted to the power grid, and the redundant energy needs to be converted into heat energy by a brake resistor in a direct current bus circuit to be consumed, so that the safe operation of the converter system is ensured.
At present, the structure of a brake circuit is as follows: the upper bridge arm unit or the lower bridge arm unit is used in series with the brake resistor, that is, one of the upper bridge arm unit and the lower bridge arm unit is in a shielding state by default, and only the other one of the upper bridge arm unit and the lower bridge arm unit is used in series with the brake resistor, so that resource waste of the brake unit is caused, the brake capacity of the converter is limited, and the power grid ride-through capacity of the wind generating set is also limited.
Disclosure of Invention
The embodiment of the utility model provides a braking return circuit, wind-powered electricity generation converter of wind-powered electricity generation converter, the last bridge arm unit in can make full use of braking return circuit and bridge arm unit resource down improve the braking capacity of converter.
In a first aspect, an embodiment of the present invention provides a braking circuit of a wind power converter, including: the device comprises a support capacitor, an upper bridge arm unit, a lower bridge arm unit, a first brake resistor module, a second brake resistor module and a controller;
the first end of the support capacitor, the first end of the upper bridge arm unit and the first end of the first brake resistor module are connected with the positive end of a direct-current bus of the converter;
the second end of the upper bridge arm unit, the second end of the first brake resistor module, the first end of the lower bridge arm unit and the first end of the second brake resistor module are connected with the alternating current output end of the converter;
the second end of the support capacitor, the second end of the lower bridge arm unit and the second end of the second brake resistor module are connected with the negative end of the direct-current bus;
the controller is respectively connected with the control end of the upper bridge arm unit and the control end of the lower bridge arm unit.
In a possible implementation manner of the first aspect, the first braking resistor module includes a plurality of sets of first resistor networks arranged in parallel, a first end of each first resistor network is connected to the positive end of the dc bus, and a second end of each first resistor network is connected to the ac output end; the first resistor network includes one or more resistors arranged in series.
In a possible implementation manner of the first aspect, the second braking resistance module includes a plurality of groups of second resistance networks arranged in parallel, a first end of each second resistance network is connected to the ac output terminal, and a second end of each second resistance network is connected to the negative terminal of the dc bus; the second resistor network includes one or more resistors arranged in series.
In one possible implementation of the first aspect, the upper leg unit comprises a first semiconductor switching device and a first diode, and the lower leg unit comprises a second semiconductor switching device and a second diode; the first end of the first semiconductor switch device and the cathode of the first diode are connected with the positive end of the direct-current bus, the second end of the first semiconductor switch device, the anode of the first diode, the first end of the second semiconductor switch device and the cathode of the second diode are connected with the alternating-current output end, and the second end of the second semiconductor switch device and the anode of the second diode are connected with the negative end of the direct-current bus; the control end of the first semiconductor switching device and the control end of the second semiconductor switching device are both connected with the controller.
In one possible embodiment of the first aspect, the braking circuit further includes a pulse width modulation PWM pulse generator, an input terminal of the PWM pulse generator is connected to the controller, and an output terminal of the PWM pulse generator is connected to the control terminal of the first semiconductor switching device and the control terminal of the second semiconductor switching device, respectively.
In one possible implementation of the first aspect, the brake circuit further includes a timer, and the controller alternately sends the control signals to the control terminal of the first semiconductor switching device and the control terminal of the second semiconductor switching device in response to receiving a trigger signal of the timer.
In one possible implementation of the first aspect, the controller is further configured to send the control signal only to the control terminal of the normal semiconductor switching device when one of the first semiconductor switching device and the second semiconductor switching device is abnormal and the other is normal.
In one possible implementation of the first aspect, the upper leg unit comprises a third diode, and the lower leg unit comprises a third semiconductor switching device; the cathode of the third diode is connected with the positive end of the direct current bus, the anode of the third diode and the first end of the third semiconductor switching device are both connected with the alternating current output end, the second end of the third semiconductor switching device is connected with the negative end of the direct current bus, and the control end of the third semiconductor switching device is connected with the controller; or,
the upper bridge arm unit comprises a fourth semiconductor switching device, and the lower bridge arm unit comprises a fourth diode; the first end of the fourth semiconductor switching device is connected with the positive end of the direct-current bus, the second end of the fourth semiconductor switching device and the cathode of the fourth diode are both connected with the alternating-current output end, and the anode of the fourth diode is connected with the negative end of the direct-current bus.
In one possible implementation of the first aspect, the semiconductor switching device is an insulated gate bipolar transistor IGBT, the first terminal of the semiconductor switching device is a collector of the IGBT, the second terminal of the semiconductor switching device is an emitter of the IGBT, and the control terminal of the semiconductor switching device is a gate of the IGBT.
In a possible implementation manner of the first aspect, the brake circuit further includes a heat dissipation device for performing heat dissipation processing on the upper bridge arm unit, the lower bridge arm unit, the first brake resistor module, and the second brake resistor module; the heat sink comprises an air-cooled heat sink and/or a water-cooled heat sink.
In a second aspect, an embodiment of the present invention provides a wind power converter, including a braking circuit as described above.
In the brake circuit provided by the embodiment of the utility model, the upper bridge arm unit is provided with the second brake resistance module, and the energy release can be carried out by controlling the start of the second brake resistance module; meanwhile, a first brake resistor module is configured for the lower bridge arm unit, and energy release can be carried out by controlling the start of the first brake resistor module.
With one of them acquiescence of messenger's among the prior art upper bridge arm unit and lower bridge arm unit be in shielding state, only utilize another and brake resistance series connection to use and compare, the embodiment of the utility model provides an in the brake circuit for upper bridge arm unit and lower bridge arm unit all dispose the brake resistance module, utilize two brake resistance modules homoenergetic to release to can not cause the wasting of resources of brake circuit, can improve converter braking capacity.
Drawings
The invention will be better understood from the following description of particular embodiments thereof, taken in conjunction with the accompanying drawings, in which like reference characters designate like or similar features.
Fig. 1 is a schematic structural diagram of a braking circuit of a wind power converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a braking circuit of a wind power converter according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a braking circuit of a wind power converter according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a braking circuit of a wind power converter according to another embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.
The embodiment of the utility model provides a braking circuit, wind-powered electricity generation converter of wind-powered electricity generation converter. Adopt the embodiment of the utility model provides an in technical scheme can make full use of last bridge arm unit and lower bridge arm unit resource in the braking circuit, improve the braking capability of converter.
Fig. 1 is a schematic structural diagram of a braking circuit of a wind power converter provided in an embodiment of the present invention. As shown in fig. 1, the brake circuit includes: the brake system comprises a support capacitor C1, an upper bridge arm unit Q1, a lower bridge arm unit Q2, a first brake resistor module Z1, a second brake resistor module Z2 and a controller Y1.
The first end of the support capacitor C1, the first end of the upper bridge arm unit Q1 and the first end of the first brake resistor module Z1 are all connected with the positive end DC + of the direct current bus of the converter.
The second end of the upper bridge arm unit Q1, the second end of the first brake resistor module Z1, the first end of the lower bridge arm unit Q2 and the first end of the second brake resistor module Z2 are all connected with the alternating current output end AC of the converter.
The second end of the support capacitor C1, the second end of the lower bridge arm unit Q2 and the second end of the second brake resistor module Z2 are all connected with the negative end DC-of the direct-current bus; controller Y1 is connected to the control terminals of upper arm unit Q1 and lower arm unit Q2, respectively.
In the brake circuit of the embodiment of the present invention, the upper arm unit Q1 is provided with the second brake resistance module Z2, and the second brake resistance module Z2 can release energy by controlling the start of the upper arm unit Q1; meanwhile, a first brake resistor module Z1 is configured for the lower arm unit Q2, and the first brake resistor module Z1 can perform energy discharge by controlling the lower arm unit Q2 to start.
With one of them acquiescence of messenger's upper bridge arm unit Q1 among the prior art and lower bridge arm unit Q2 be in shielding state, only utilize another and brake resistance series connection to use and compare, the embodiment of the utility model provides a brake circuit all disposes the brake resistance module for upper bridge arm unit Q1 and lower bridge arm unit Q2, utilizes two brake resistance modules all to carry out the energy and releases to can not cause the wasting of resources of brake unit, can improve converter braking capacity.
In addition, the embodiment of the utility model discloses still carry out the modularized design to brake resistance, because brake resistance for the present wind generating set converter is the customization device, the wind generating set of different power, converter brake resistance configuration also is different, these brake resistances can't be compatible each other, cause the brake resistance version numerous, the converter configuration is complicated, material management cost increases; moreover, the following problems exist for a customized brake resistor:
(1) each developed converter needs to go through engineering links such as drawing design, structure confirmation, sample trial installation, small batch verification and the like, so that the material development period is long;
(2) when one resistor disc in the brake circuit module has a problem, the whole brake circuit module is possibly required to be replaced and is not easy to maintain, and a converter cannot run before a new piece is replaced, so that the wind generating set is stopped due to failure, and the generated energy loss is caused;
(3) the braking resistor needs to operate in a 1200V direct current bus circuit, and if the braking resistor is designed to be a single customized resistor, the requirements on insulation and voltage resistance are high, so that the cost of the device is increased.
Through the embodiment of the utility model provides an in brake resistance modular design, usable series-parallel connection small resistor's mode replaces above-mentioned single customization resistance to avoid above-mentioned problem, and compare with single resistance of customization, the mode of series-parallel connection small resistor can also release bigger energy, makes the converter electric wire netting pass through the ability stronger.
In addition, because a single resistance card is easy to maintain, when one resistance card has a problem, the resistance card can be directly replaced and maintained, the integral replacement cost of spare parts is reduced, and the modularized design of the braking resistor can be dispersedly arranged in a limited space, so that the space layout requirement is reduced.
Fig. 2 is a schematic structural diagram of a braking circuit of a wind power converter according to another embodiment of the present invention. As shown in fig. 2, the first and second braking resistor modules Z1 and Z2 may be composed of components, and the detailed structure of the first and second braking resistor modules Z1 and Z2 will be described in detail below.
In one example, the first braking resistor module Z1 may include multiple sets of first resistor networks arranged in parallel, with first ends of the first resistor networks connected to the positive terminal DC + of the DC bus and second ends connected to the AC output terminals AC.
Similarly, the second braking resistance module Z2 may also include multiple sets of second resistance networks arranged in parallel, with a first end of the second resistance network connected to the AC output terminal AC and a second end connected to the DC-negative terminal of the DC bus.
Fig. 2 schematically shows a total of 3 first resistor networks and 3 second resistor networks, wherein the first resistor network Z11 comprises a resistor R1 and a resistor R2 arranged in series, the first resistor network Z12 comprises a resistor R3 and a resistor R4 arranged in series, and the first resistor network Z13 comprises a resistor R5 and a resistor R6 arranged in series. The second resistor network Z21 includes a resistor R7 and a resistor R8 arranged in series, the second resistor network Z22 includes a resistor R9 and a resistor R10 arranged in series, and the second resistor network Z13 includes a resistor R11 and a resistor R12 arranged in series.
It should be noted that the resistances of the resistors in the first resistor network or the second resistor network may be the same or different. In one example, for convenience of calculation, the brake resistors of the single standard parts with large resistance and small energy can be uniformly selected, and the design with small resistance, large power and large energy can be realized through two modes of series connection and parallel connection.
In addition, consider that carbon ceramic resistance card has noninductive characteristic, operating frequency can reach the megahertz scope, can absorb high pulse energy, is applicable to harsh work occasion such as strong pulse overload to and be applicable to application occasions such as power transmission and electric traction, pulse power supply, the embodiment of the utility model provides a preferred carbon ceramic resistance card carries out braking resistance modular design. Of course, those skilled in the art can adopt resistor sheets with other material structures according to actual needs, and the resistor sheets are not limited herein.
Fig. 2 also shows specific structural compositions of the upper arm unit Q1 and the lower arm unit Q2.
As shown in fig. 2, the upper arm unit Q1 includes a first semiconductor switching device K1 and a first diode D1, and the lower arm unit Q2 includes a second semiconductor switching device K2 and a second diode D2.
The first end of the first semiconductor switching device K1 and the cathode of the first diode D1 are both connected with the positive end DC + of the direct current bus, the second end of the first semiconductor switching device K1, the anode of the first diode D1, the first end of the second semiconductor switching device K2 and the cathode of the second diode D2 are all connected with the alternating current output end AC, and the second end of the second semiconductor switching device K2 and the anode of the second diode D2 are both connected with the negative end DC-of the direct current bus; the control terminal of the first semiconductor switching device K1 and the control terminal of the second semiconductor switching device K2 are both connected to the controller Y1.
In an example, the semiconductor switching device may be an IGBT, the first terminal of the semiconductor switching device is a collector C of the IGBT, the second terminal is an emitter E of the IGBT, the control terminal is a gate G of the IGBT, and the gate G controls the collector C and the emitter E to be turned on or off according to the switching control signal.
In one example, the switching control signal may be a PWM pulse signal, and the PWM pulse generator S1 receives parameters such as a duty ratio from the controller Y1 and then outputs a corresponding PWM pulse.
For example, if the resistance value of a standard component resistor disc is 1.5 Ω and the rated energy is 110kJ, the design according to the topological diagram of fig. 2 is adopted, R1 is connected in series with R2, so that the resistance value of Z11 is 3 Ω, R3 is connected in series with R4, so that the resistance value of Z12 is 3 Ω, R5 is connected in series with R6, so that the resistance value of Z13 is 3 Ω, and then three resistor network branches of Z11, Z12 and Z13 are connected in parallel, so that the total resistance value of Z1 is 1 Ω. Due to the rated energy of 110kJ when the resistance value is 1.5 omega, the braking capacity of 1 omega and 165kJ can be realized after the IGBT in the lower bridge arm unit Q2 of the braking circuit is turned on.
Similarly, R7 is connected with R8 in series, the resistance value of Z21 can be 3 Ω, R9 is connected with R10 in series, the resistance value of Z22 can be 3 Ω, R11 is connected with R12 in series, the resistance value of Z23 can be 3 Ω, then three resistor network branches of Z21, Z22 and Z23 are connected in parallel, the total resistance value of Z2 can be 1 Ω, and after an IGBT in a bridge arm unit Q1 on a brake loop is turned on, the braking capacity of 1 Ω and energy 165kJ can be realized.
The embodiment of the utility model provides an in, lower bridge arm unit Q2 and upper bridge arm unit Q1 alternate operation, whole braking circuit can realize 0.5 omega, and the energy is 330kJ brake capacity, continues the series-parallel connection according to this design, can realize the megacoke energy demand.
Further, the embodiment of the utility model provides a still carry out fault-tolerant design to brake circuit, IGBT in the upper bridge arm or IGBT in the lower bridge arm wherein one of them is unusual, when another is normal, only sends control signal to normal IGBT's grid G, carries out the energy by the brake resistance that normal IGBT corresponds and releases the function.
For example, when the upper arm unit Q1 or the lower arm unit Q2 fails to achieve the braking function, the upper arm unit Q1 or the lower arm unit Q2 can be shielded to continue to operate, the control strategy is adjusted, the failed side IGBT does not send a PWM pulse signal, that is, half of the whole braking circuit works to achieve normal braking, and when the high voltage and the low voltage of the power grid pass through, the wind generating set does not break away from the power grid and continues to operate.
Further, the embodiment of the present invention also provides an alternate operation design for the brake circuit based on a timer (not shown in the figure), and the controller Y1 sends control signals to the control terminal of the first semiconductor switching device K1 and the control terminal of the second semiconductor switching device K2 alternately in response to receiving a trigger signal of the timer.
For example, when the upper bridge arm unit IGBT and the corresponding brake resistor are over-temperature, the lower bridge arm unit IGBT and the corresponding brake resistor can be switched to operate, and when the upper bridge arm unit IGBT and the corresponding brake resistor are cooled completely and the lower bridge arm unit IGBT and the corresponding brake resistor are over-temperature, the upper bridge arm unit IGBT and the corresponding brake resistor are switched to operate, so that the brake circuit can be operated alternately and circularly, and the capacity maximization of the brake circuit can be realized.
The timer is internally provided with a time length which is obtained based on the temperature rise coefficient of the brake resistor and corresponds to the rated power or the rated temperature. If the temperature rise time of the upper bridge arm unit IGBT and the corresponding brake resistor is close to the hardware performance boundary, the timer is triggered, the controller Y1 is switched to the lower bridge arm unit IGBT and the corresponding brake resistor to work, at the moment, the upper bridge arm unit IGBT and the corresponding brake resistor start to cool, and the converter can also carry out grid crossing to the maximum extent without grid disconnection operation through repeated alternate work.
Illustratively, 10MJ energy is set to be released by a brake circuit, the maximum energy released by R1-R6 and R7-R12 in a single time is 2.5MJ respectively, at the moment, a PWM pulse signal is sent through a control strategy, the upper bridge arm unit Q1 is started, and the energy of 2.5MJ is released through R7-R12 brake resistors; at the moment, the upper bridge arm unit Q1 is closed, the lower bridge arm unit Q2 is opened, and 2.5MJ energy is discharged through the R1-R6 brake resistor; at the moment, the R7-R12 brake resistor is cooled completely, then the lower bridge arm unit Q2 is closed, then the upper bridge arm unit Q1 is opened, and 2.5MJ energy is released continuously; at the moment, the R1-R6 brake resistor is also cooled, the upper bridge arm unit Q1 is closed, the lower bridge arm unit Q2 is opened, and the last 2.5MJ energy is released continuously, so that the brake loop circularly and alternately operates, exponential energy release can be realized, and the brake loop and the brake resistor device are prevented from failing in the low-penetration period or the high-penetration period.
In addition, based on cost consideration, diodes can be adopted to replace IGBTs in the upper bridge arm unit Q1 of the brake circuit, namely, a switching device in the upper bridge arm unit Q1 is eliminated, and meanwhile, R7-R12 brake resistors are eliminated, and according to the scheme, more resistor networks can be connected in parallel at the R1-R6 brake resistors to achieve the function of discharging energy which is the same as that of two bridge arm units.
Fig. 3 is a schematic structural diagram of a braking circuit of a wind power converter according to another embodiment of the present invention. The upper bridge arm unit Q1 comprises a third diode D3, and the lower bridge arm unit Q2 comprises a third semiconductor switching device K3; the cathode of the third diode D3 is connected with the positive end DC + of the direct current bus, the anode of the third diode D3 and the first end of the third semiconductor switching device K3 are both connected with the alternating current output end AC, the second end of the third semiconductor switching device K3 is connected with the negative end DC-of the direct current bus, the control end of the third semiconductor switching device K3 is connected with the controller Y1, and meanwhile, more resistor networks are connected in parallel at the R1-R6 braking resistors to achieve the same energy discharge.
Similarly, the diode of the lower bridge arm unit Q2 of the brake circuit can replace the IGBT, that is, the switch device in the upper bridge arm unit Q2 is eliminated, and the R1-R6 brake resistor is eliminated at the same time, and for this scheme, more resistor networks can be connected in parallel at the R7-R12 brake resistor to realize the function of discharging the energy same as that of the two bridge arm units.
Fig. 4 is a schematic structural diagram of a braking circuit of a wind power converter according to another embodiment of the present invention. The upper bridge arm unit Q1 comprises a fourth semiconductor switching device K4, and the lower bridge arm unit Q2 comprises a fourth diode D4; the first end of the fourth semiconductor switching device K4 is connected with the positive end DC + of the direct current bus, the second end of the fourth semiconductor switching device K4 and the cathode of the fourth diode D4 are both connected with the alternating current output end AC, the anode of the fourth diode D4 is connected with the negative end DC-of the direct current bus, the control end of the fourth semiconductor switching device K4 is connected with the controller Y1, and meanwhile, more resistor networks are connected in parallel at the R7-R12 braking resistors to achieve the same energy discharge.
The embodiment of the utility model provides a brake resistance modular design, fault-tolerant design and alternate operation design have been carried out brake circuit, have improved converter operational reliability, have promoted wind generating set's the friendship of being incorporated into the power networks.
In an optional embodiment, the brake circuit in the embodiment of the present invention further includes a heat dissipation device for performing heat dissipation processing on the upper arm unit Q1, the lower arm unit Q2, the first brake resistor module Z1, and the second brake resistor module Z2. The heat dissipation device includes, but is not limited to, an air cooling heat dissipation device and/or a water cooling heat dissipation device, wherein the air cooling heat dissipation principle includes forced air cooling and natural air cooling.
Furthermore, the embodiment of the utility model provides a still provide a wind power converter, include as above braking circuit.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the device embodiments, reference may be made to the description of the method embodiments in the relevant part. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications, and additions or change the order between the steps after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of embodiments of the invention are programs or code segments that are used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
The embodiments of the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the embodiments of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (11)
1. A braking circuit of a wind power converter is characterized by comprising: the device comprises a support capacitor, an upper bridge arm unit, a lower bridge arm unit, a first brake resistor module, a second brake resistor module and a controller; wherein,
the first end of the support capacitor, the first end of the upper bridge arm unit and the first end of the first brake resistor module are all connected with the positive end of a direct-current bus of the converter;
the second end of the upper bridge arm unit, the second end of the first brake resistance module, the first end of the lower bridge arm unit and the first end of the second brake resistance module are all connected with the alternating current output end of the converter;
the second end of the support capacitor, the second end of the lower bridge arm unit and the second end of the second brake resistor module are connected with the negative end of the direct current bus;
and the controller is respectively connected with the control end of the upper bridge arm unit and the control end of the lower bridge arm unit.
2. The brake circuit of claim 1, wherein the first brake resistor module comprises a plurality of sets of first resistor networks arranged in parallel, a first end of the first resistor network being connected to the positive end of the dc bus and a second end of the first resistor network being connected to the ac output;
the first resistor network includes one or more resistors arranged in series.
3. The brake circuit of claim 1, wherein the second brake resistor module comprises a plurality of sets of second resistor networks arranged in parallel, a first end of each second resistor network being connected to the ac output terminal and a second end thereof being connected to the negative terminal of the dc bus;
the second resistor network includes one or more resistors arranged in series.
4. The brake circuit of claim 1,
the upper bridge arm unit comprises a first semiconductor switch device and a first diode, and the lower bridge arm unit comprises a second semiconductor switch device and a second diode; wherein,
the first end of the first semiconductor switching device and the cathode of the first diode are connected with the positive end of the direct current bus, the second end of the first semiconductor switching device, the anode of the first diode, the first end of the second semiconductor switching device and the cathode of the second diode are connected with the alternating current output end, and the second end of the second semiconductor switching device and the anode of the second diode are connected with the negative end of the direct current bus;
the control terminal of the first semiconductor switching device and the control terminal of the second semiconductor switching device are both connected with the controller.
5. The brake circuit of claim 4, further comprising a Pulse Width Modulation (PWM) pulse generator, wherein an input terminal of the PWM pulse generator is connected to the controller, and an output terminal of the PWM pulse generator is connected to the control terminal of the first semiconductor switching device and the control terminal of the second semiconductor switching device, respectively.
6. The brake circuit of claim 4, further comprising a timer, wherein the controller alternately sends control signals to the control terminal of the first semiconductor switching device and the control terminal of the second semiconductor switching device in response to receiving a trigger signal of the timer.
7. The brake circuit of claim 4, wherein the controller is further configured to send a control signal only to a control terminal of a normal semiconductor switching device when one of the first semiconductor switching device and the second semiconductor switching device is abnormal and the other one is normal.
8. The brake circuit of claim 1,
the upper bridge arm unit comprises a third diode, and the lower bridge arm unit comprises a third semiconductor switch device; the cathode of the third diode is connected with the positive end of the direct current bus, the anode of the third diode and the first end of the third semiconductor switching device are both connected with the alternating current output end, the second end of the third semiconductor switching device is connected with the negative end of the direct current bus, and the control end of the third semiconductor switching device is connected with the controller;
or,
the upper bridge arm unit comprises a fourth semiconductor switching device, and the lower bridge arm unit comprises a fourth diode; the first end of the fourth semiconductor switching device is connected with the positive end of the direct current bus, the second end of the fourth semiconductor switching device and the cathode of the fourth diode are both connected with the alternating current output end, and the anode of the fourth diode is connected with the negative end of the direct current bus.
9. The brake circuit according to any one of claims 4-8, wherein said semiconductor switching device is an Insulated Gate Bipolar Transistor (IGBT), said first terminal of said semiconductor switching device is a collector of said IGBT, said second terminal of said semiconductor switching device is an emitter of said IGBT, and said control terminal of said semiconductor switching device is a gate of said IGBT.
10. The brake circuit according to claim 1, further comprising a heat dissipation device for performing heat dissipation processing on the upper bridge arm unit, the lower bridge arm unit, the first brake resistance module, and the second brake resistance module;
the heat dissipation device comprises an air cooling heat dissipation device and/or a water cooling heat dissipation device.
11. Wind power converter, characterized in that it comprises a braking circuit according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822109786.7U CN209072336U (en) | 2018-12-14 | 2018-12-14 | Brake circuit, the wind electric converter of wind electric converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822109786.7U CN209072336U (en) | 2018-12-14 | 2018-12-14 | Brake circuit, the wind electric converter of wind electric converter |
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| Publication Number | Publication Date |
|---|---|
| CN209072336U true CN209072336U (en) | 2019-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822109786.7U Active CN209072336U (en) | 2018-12-14 | 2018-12-14 | Brake circuit, the wind electric converter of wind electric converter |
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| Country | Link |
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| CN (1) | CN209072336U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478627A (en) * | 2020-04-13 | 2020-07-31 | 珠海格力电器股份有限公司 | Servo motor dynamic braking circuit and control method thereof |
| CN113131510A (en) * | 2020-01-16 | 2021-07-16 | 新疆金风科技股份有限公司 | High voltage ride through control method and system for wind power plant, MMC and machine side converter |
| US12100955B2 (en) | 2020-01-16 | 2024-09-24 | Xinjiang Goldwind Science & Technology Co., Ltd. | Wind farm, high voltage ride through control method therefor, system, MMC and machine-side inverter |
-
2018
- 2018-12-14 CN CN201822109786.7U patent/CN209072336U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131510A (en) * | 2020-01-16 | 2021-07-16 | 新疆金风科技股份有限公司 | High voltage ride through control method and system for wind power plant, MMC and machine side converter |
| CN113131510B (en) * | 2020-01-16 | 2022-09-27 | 新疆金风科技股份有限公司 | High voltage ride through control method and system for wind power plant, MMC and machine side converter |
| US12100955B2 (en) | 2020-01-16 | 2024-09-24 | Xinjiang Goldwind Science & Technology Co., Ltd. | Wind farm, high voltage ride through control method therefor, system, MMC and machine-side inverter |
| CN111478627A (en) * | 2020-04-13 | 2020-07-31 | 珠海格力电器股份有限公司 | Servo motor dynamic braking circuit and control method thereof |
| CN111478627B (en) * | 2020-04-13 | 2021-11-05 | 珠海格力电器股份有限公司 | Servo motor dynamic braking circuit and control method thereof |
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