CN113036740A - Converter brake control method and device of wind generating set - Google Patents
Converter brake control method and device of wind generating set Download PDFInfo
- Publication number
- CN113036740A CN113036740A CN201911347695.XA CN201911347695A CN113036740A CN 113036740 A CN113036740 A CN 113036740A CN 201911347695 A CN201911347695 A CN 201911347695A CN 113036740 A CN113036740 A CN 113036740A
- Authority
- CN
- China
- Prior art keywords
- voltage value
- converter
- voltage
- value
- brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 62
- 230000004048 modification Effects 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims 2
- 230000004913 activation Effects 0.000 claims 1
- 230000006870 function Effects 0.000 description 19
- 230000008569 process Effects 0.000 description 13
- 238000004590 computer program Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
Abstract
The invention discloses a converter brake control method and device of a wind generating set. The converter braking control method of the wind generating set comprises the following steps: acquiring the grid side voltage of a converter of the wind generating set; extracting a positive sequence component and a negative sequence component in the network side voltage; determining a braking starting voltage value of the converter according to the positive sequence component and the negative sequence component; and controlling the converter to perform braking operation according to the braking starting voltage value. According to the embodiment of the invention, the problem that the converter has higher impulse voltage at the moment of starting the braking function in the prior art can be solved.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a converter brake control method and device of a wind generating set.
Background
At present, when a grid-side converter in a converter of a wind generating set cannot normally output power, redundant power can be consumed through the braking function of the converter. For example, when the grid voltage is lower than 0.9pu, that is, when the grid has a short-circuit fault, the grid-side converter cannot normally output active power because the grid-side voltage of the wind generating set is low, so that the dc bus voltage of the converter is raised, and at this time, the braking function of the converter needs to be started to consume redundant active power through the braking resistor.
However, when the grid has high voltage ride through, that is, the grid voltage is 1.1 to 1.3 times of the rated voltage of the grid, in order to ensure that the grid-side converter can normally output active power to the grid, it is necessary to avoid starting the braking function of the converter when the grid has high voltage ride through, and therefore, the braking function of the converter needs to set a higher starting voltage. Because the starting voltage of the braking function is higher and the braking function has starting delay, when the power grid has low voltage ride through, the converter has higher impulse voltage at the moment of starting the braking function, and further the converter generates hardware overvoltage faults.
Disclosure of Invention
The embodiment of the invention provides a method and a device for controlling braking of a converter of a wind generating set, which can solve the problem of high impulse voltage of the converter at the moment of starting a braking function in the prior art.
In a first aspect, an embodiment of the present invention provides a converter braking control method for a wind turbine generator system, where the method includes:
acquiring the grid side voltage of a converter of the wind generating set;
extracting a positive sequence component and a negative sequence component in the network side voltage;
determining a braking starting voltage value of the converter according to the positive sequence component and the negative sequence component;
and controlling the converter to perform braking operation according to the braking starting voltage value.
In a second aspect, an embodiment of the present invention provides a converter brake control apparatus for a wind turbine generator system, where the apparatus includes:
the grid side voltage acquisition module is used for acquiring the grid side voltage of a converter of the wind generating set;
the component extraction module is used for extracting a positive sequence component and a negative sequence component in the network side voltage;
the voltage determining module is used for determining the braking starting voltage value of the converter according to the positive sequence component and the negative sequence component;
and the brake control module is used for controlling the converter to perform brake operation according to the brake starting voltage value.
In a third aspect, an embodiment of the present invention provides a converter brake control device for a wind turbine generator system, where the device includes: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements a converter braking control method of a wind park according to the first aspect.
In a fourth aspect, the embodiments of the present invention provide a computer-readable storage medium, on which computer program instructions are stored, and the computer program instructions, when executed by a processor, implement the converter braking control method of a wind turbine generator system according to the first aspect.
According to the converter braking control method and device of the wind generating set, the grid-side voltage of the converter of the wind generating set can be obtained, then the positive sequence component and the negative sequence component in the obtained grid-side voltage are extracted, the braking starting voltage value of the converter is determined according to the positive sequence component and the negative sequence component, and the converter is controlled to perform braking operation according to the braking starting voltage value. Therefore, the embodiment of the invention can calculate the brake starting voltage value in real time according to the positive and negative sequence components of the network side voltage, so that the brake starting voltage value can be dynamically adjusted along with the network voltage, and the instantaneous impact voltage of the converter in the starting brake function can be reduced when the network has low voltage ride through, so as to protect the hardware of the converter.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a power transmission line of a wind generating set in the prior art;
FIG. 2 is a schematic flow chart of a converter brake control method of a wind generating set according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a converter brake control device of a wind generating set according to an embodiment of the invention;
fig. 4 is a schematic hardware structure diagram of a converter brake control device of a wind generating set according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Fig. 1 shows a schematic circuit diagram of a power transmission line of a conventional wind turbine generator system. As shown in fig. 1, the power transmission terminal of the generator 110 of the wind turbine generator set is connected to the converter input terminal of the converter 120 through a transmission cable, and the converter output terminal of the converter 120 is connected to the box transformer input terminal of the box transformer 130 through a transmission cable.
The converter 120 comprises a machine side converter 121, a direct current bus 122, a brake module 123 and a grid side converter 124, the machine side converter 121 is connected with the grid side converter 124 through the direct current bus 122, the brake module 123 is connected between a high-voltage bus and a low-voltage bus of the direct current bus 122, and the brake module 123 comprises a brake resistor and a brake unit. The braking module 123 can play a role in consuming redundant power when the grid-side converter of the wind generating set cannot normally output power, the on and off of the braking unit is completely determined by the collected bus voltage value, when the collected bus voltage value is greater than the braking starting voltage value, the braking unit starts to work, and when the collected bus voltage value is lower than the braking off voltage value, the braking unit stops working. Wherein the brake-on voltage value is greater than the brake-off voltage value.
In the existing brake control process, both the brake-on voltage value and the brake-off voltage value are constant values. When the power grid has high voltage ride through, namely the power grid voltage is 1.1-1.3 times of the rated voltage of the power grid, in order to ensure that the grid-side converter can normally output active power to the power grid, the braking function of the converter needs to be prevented from being started when the power grid has high voltage ride through, so that the braking function of the converter needs to be set with a higher braking starting voltage value. Because the braking starting voltage value of the braking function is high and the braking function has starting delay, when the power grid has low voltage ride through, the converter has high impulse voltage at the moment of starting the braking function, the impulse voltage is increased along with the increase of active power consumed by braking, and when the active power is high, the impulse voltage can possibly cause hardware overvoltage faults triggering the converter. If the converter has hardware overvoltage faults, the wind generating set stops during the period of low voltage ride through of the power grid, so that fault ride through failure is caused, and the requirements of the power grid on the wind generating set are not met. In addition, too high a dc voltage may cause a reduction in the lifetime of the converter and even direct damage to the converter.
In order to solve the problems in the prior art, the embodiment of the invention provides a method, a device, equipment and a medium for controlling the braking of a converter of a wind generating set. First, a converter braking control method of a wind turbine generator system according to an embodiment of the present invention is described below.
Fig. 2 is a schematic flow chart illustrating a converter brake control method of a wind turbine generator system according to an embodiment of the present invention. The braking control method shown in fig. 2 may be performed by a converter controller (not shown) of the converter 120 in fig. 1.
As shown in fig. 2, the converter brake control method of the wind turbine generator system may include:
s210, obtaining the grid side voltage of a converter of the wind generating set;
s220, extracting a positive sequence component and a negative sequence component in the network side voltage;
s230, determining a braking starting voltage value of the converter according to the positive sequence component and the negative sequence component;
and S240, controlling the converter to perform braking operation according to the braking starting voltage value.
In the embodiment of the invention, the grid-side voltage of the converter of the wind generating set can be obtained, then the positive sequence component and the negative sequence component in the obtained grid-side voltage are extracted, and the braking starting voltage value of the converter is determined according to the positive sequence component and the negative sequence component, so that the converter is controlled to perform braking operation according to the braking starting voltage value. Therefore, the embodiment of the invention can calculate the brake starting voltage value in real time according to the positive and negative sequence components of the network side voltage, so that the brake starting voltage value can be dynamically adjusted along with the network voltage, and the instantaneous impact voltage of the converter in the starting brake function can be reduced when the network has low voltage ride through, so as to protect the hardware of the converter.
In S210 according to some embodiments of the present invention, the converter controller may obtain an output terminal voltage of the grid-side converter of the converter as a grid-side voltage of the converter.
Specifically, the output end voltage of the grid-side converter can be directly obtained from the operation data of the wind generating set, and the output end voltage of the grid-side converter can also be directly collected through a voltage collecting device, which is not limited herein.
In S220 according to some embodiments of the present invention, the grid-side voltage may be a three-phase instantaneous voltage, and the positive-sequence and negative-sequence separation processing is performed on the grid-side voltage, that is, the positive-sequence component and the negative-sequence component in the grid-side voltage may be extracted.
There are various methods for performing positive-negative sequence separation processing on the grid-side voltage, and in some embodiments, the specific method for performing positive-negative sequence separation processing on the grid-side voltage may include:
collecting three-phase network side voltage ea、eb、ecDiscretizing the voltage of the three-phase network side, and recording the value of 90 degrees of time delay, which is respectively ea_s90、eb_s90、ec_s90And extracting a positive sequence voltage real-time value of the three-phase network side voltage by using the following formula:
obtaining real-time value e of the positive sequence componenta_p、eb_p、ec_pAnd then, calculating to obtain a real-time value of the negative sequence voltage of the three-phase network side voltage by using the following formula:
ea_n＝ea-ea_p
eb_n＝eb-eb_p
ec_n＝ec-ec_p
wherein e isa_n、eb_n、ec_nIs the real-time value of the negative sequence component of the three-phase network side voltage.
Converting the real-time values of the positive and negative sequence components of the three-phase network side voltage into the positive and negative sequence components under a two-phase rotating coordinate system by using the following conversion matrix:
wherein, the two phases rotatePositive and negative sequence components under the mark system, which are respectively d-axis positive sequence components
Positive sequence component of q axis
Negative sequence component of d axis
And q-axis negative sequence component
Using positive sequence component of q-axis
And obtaining the voltage angle theta of the network side through a proportional-integral link.
Finally, the positive and negative sequence component peak values of the network side voltage can be calculated by using the following formula:
the method for performing positive/negative sequence separation processing on the grid-side voltage may be other existing methods, and is not limited herein.
In some embodiments of the present invention, the specific method of S230 may include:
obtaining rated reactive current of a converter, inductance value of a network side filter reactor of the converter, angular frequency of network side voltage and preset compensation quantity;
and determining a brake starting voltage value according to the positive sequence component, the negative sequence component, the rated reactive current, the inductance value, the angular frequency and the preset compensation quantity.
In particular, converter controlThe device can directly acquire the rated reactive current i of the converter from the operation data of the wind generating setqInductance value L of grid-side filter reactor of converter, angular frequency omega of grid-side voltage and preset compensation quantity Udc_chopper_offset. Then, e is addedp、en、iqL, omega and Udc_chopper_offsetInputting a brake starting voltage value Udc_chopper_refThe calculation formula of (2):
obtaining a braking starting voltage value Udc_chopper_ref。
Where ω may be 2 × π × 50, Udc_chopper_offsetIs determined according to the voltage utilization rate, the voltage drop of the IGBT in the brake unit, etc., and may be set to 80.
In the embodiment of the invention, the advantage of calculating the brake starting voltage value by using the positive sequence component and the negative sequence component is that when the voltage of the network side rises and even high voltage ride through occurs, the brake starting voltage value can rise smoothly, so that the condition that a wind generating set is triggered to brake in the high voltage ride through process is avoided; when the voltage of the grid side is reduced and even low voltage ride through occurs, the high voltage ride through is reduced along with the reduction of the high voltage ride through, so that even if the wind generating set is triggered to brake in the low voltage ride through process, the instantaneous impact voltage of the brake opening is limited to a lower level, the wind generating set can be ensured to smoothly pass through the high and low voltage ride through, and the device damage of the converter caused by overhigh voltage of a direct current bus can be avoided.
In S240 according to some embodiments of the present invention, the converter may be controlled to perform a braking operation directly based on the calculated braking start voltage value, that is, if the collected bus voltage value of the dc bus is greater than the braking start voltage value, the converter controller controls the braking unit to start operating so as to consume the excess power through the braking resistor.
In other embodiments of the present invention, the specific method of S240 may further include:
acquiring a voltage set value of a direct current bus of the converter;
correcting the brake starting voltage value according to the voltage set value to obtain a corrected first target starting voltage value;
and controlling the converter to perform braking operation according to the first target starting voltage value.
Specifically, considering that the direct-current bus voltage fluctuates in the actual operation process of the wind generating set, in order to avoid triggering the wind generating set to brake due to the fluctuation of the direct-current bus voltage, the braking starting voltage value needs to be corrected based on the voltage set value of the direct-current bus, and the converter is controlled to perform braking operation by using the corrected first target starting voltage value.
It should be noted that the principle of the method for controlling the converter to perform the braking operation based on the first target starting voltage value is similar to that of the method for controlling the converter to perform the braking operation based on the braking starting voltage value, and details are not repeated herein.
In these embodiments, optionally, a specific method for correcting the brake-on voltage value according to the voltage set value to obtain the corrected first target-on voltage value may include:
calculating a voltage difference value between the brake starting voltage value and a voltage set value;
comparing the voltage difference value with a preset difference value;
if the voltage difference value is larger than the preset difference value, taking the brake starting voltage value as a first target starting voltage value;
and if the voltage difference value is smaller than or equal to the preset difference value, taking the sum of the voltage set value and the preset difference value as a first target starting voltage value.
In the actual operation process of the wind generating set, the braking starting voltage value needs to be 50V larger than the voltage set value of the direct current bus under the general condition, and the wind generating set can be prevented from being triggered to brake due to the fluctuation of the voltage of the direct current bus. In some embodiments, the preset difference may be set to 50V. If the voltage difference between the brake starting voltage value and the voltage set value is larger than 50V, directly taking the brake starting voltage value as a first target starting voltage value; if the voltage difference between the brake starting voltage value and the voltage set value is less than or equal to 50V, the sum of the voltage set value of the direct current bus and 50V is required to be used as the first target starting voltage value.
In still other embodiments of the present invention, the specific method of S240 may further include:
obtaining a maximum brake starting voltage value of the converter;
correcting the first target starting voltage value according to the maximum braking starting voltage value to obtain a corrected second target starting voltage value;
and controlling the converter to perform braking operation according to the second target starting voltage value.
Specifically, a maximum brake starting voltage value needs to be set as an upper limit of a brake starting voltage value to protect hardware facilities of the wind generating set, the maximum brake starting voltage value is used for correcting a first target starting voltage value, and a second target starting voltage value obtained after correction is used for controlling the converter to perform brake operation.
It should be noted that the principle of the method for controlling the converter to perform the braking operation based on the second target starting voltage value is similar to that of the method for controlling the converter to perform the braking operation based on the braking starting voltage value, and details are not repeated herein.
In these embodiments, optionally, a specific method for correcting the first target starting voltage value according to the maximum brake starting voltage value to obtain the corrected second target starting voltage value may include:
if the first target starting voltage value is larger than the brake starting maximum voltage value, taking the brake starting maximum voltage value as a second target starting voltage value;
and if the first target starting voltage value is less than or equal to the maximum braking starting voltage value, taking the first target starting voltage value as a second target starting voltage value.
When the first target starting voltage value is larger than the brake starting maximum voltage value, in order to enable the brake starting voltage value not to exceed the brake starting voltage value upper limit, the brake starting maximum voltage value is used as a second target starting voltage value; when the first target starting voltage value is less than or equal to the maximum brake starting voltage value, the first target starting voltage value does not exceed the upper limit of the brake starting voltage value, and therefore the first target starting voltage value can not be adjusted.
In summary, the embodiment of the invention can ensure that the braking function of the wind generating set is not started during the high voltage ride through period, can also ensure that the braking function of the wind generating set is started at a lower braking starting voltage during the low voltage ride through period, and can effectively reduce the instantaneous impact of the direct current bus voltage caused by braking delay on the premise of not increasing the hardware cost.
Fig. 3 shows a schematic structural diagram of a converter brake control device of a wind generating set according to an embodiment of the invention. The brake control means shown in fig. 3 may be provided in the converter controller (not shown) of the converter 120 in fig. 1.
As shown in fig. 3, the converter brake control apparatus of the wind turbine generator system may include:
a grid-side voltage obtaining module 310, configured to obtain a grid-side voltage of a converter of the wind turbine generator system;
a component extraction module 320 for extracting a positive sequence component and a negative sequence component in the grid-side voltage;
the voltage determining module 330 is configured to determine a braking start voltage value of the converter according to the positive sequence component and the negative sequence component;
and the brake control module 340 is used for controlling the converter to perform brake operation according to the brake starting voltage value.
In the embodiment of the invention, the grid-side voltage of the converter of the wind generating set can be obtained, then the positive sequence component and the negative sequence component in the obtained grid-side voltage are extracted, and the braking starting voltage value of the converter is determined according to the positive sequence component and the negative sequence component, so that the converter is controlled to perform braking operation according to the braking starting voltage value. Therefore, the embodiment of the invention can calculate the brake starting voltage value in real time according to the positive and negative sequence components of the network side voltage, so that the brake starting voltage value can be dynamically adjusted along with the network voltage, and the instantaneous impact voltage of the converter in the starting brake function can be reduced when the network has low voltage ride through, so as to protect the hardware of the converter.
In some embodiments of the present invention, the grid-side voltage obtaining module 310 may obtain an output terminal voltage of a grid-side converter of the converter as a grid-side voltage of the converter.
In some embodiments of the present invention, the grid-side voltage may be a three-phase transient voltage, and the component extraction module 320 may perform positive-negative sequence separation processing on the grid-side voltage to extract positive-sequence components and negative-sequence components in the grid-side voltage.
In some embodiments of the present invention, the voltage determination module 330 may include:
the parameter acquisition unit is used for acquiring rated reactive current of the converter, inductance value of a network side filter reactor of the converter, angular frequency of network side voltage and preset compensation quantity;
and the parameter calculation unit is used for determining a brake starting voltage value according to the positive sequence component, the negative sequence component, the rated reactive current, the inductance value, the angular frequency and the preset compensation amount.
In some embodiments of the present invention, the brake control module 340 may include:
the bus voltage acquisition unit is used for acquiring a voltage set value of a direct current bus of the converter;
the first voltage correction unit is used for correcting the brake starting voltage value according to the voltage set value to obtain a corrected first target starting voltage value;
and the first brake control unit is used for controlling the converter to perform brake operation according to the first target starting voltage value.
In these embodiments, optionally, the first voltage modification unit may include:
a difference value calculating unit for calculating a voltage difference value between the brake start voltage value and the voltage set value;
a difference comparison unit for comparing the voltage difference with a preset difference;
the first voltage determining unit is used for taking the brake starting voltage value as a first target starting voltage value if the voltage difference value is larger than a preset difference value; and if the voltage difference value is smaller than or equal to the preset difference value, taking the sum of the voltage set value and the preset difference value as a first target starting voltage value.
In other embodiments of the present invention, the brake control module 340 may further include:
the starting voltage obtaining unit is used for obtaining the maximum braking starting voltage value of the converter;
the second voltage correction unit is used for correcting the first target starting voltage value according to the maximum braking starting voltage value to obtain a corrected second target starting voltage value;
and the second brake control unit is used for controlling the converter to perform brake operation according to the second target starting voltage value.
In these embodiments, optionally, the second voltage modification unit may include:
the second voltage determining unit is used for taking the brake starting maximum voltage value as a second target starting voltage value if the first target starting voltage value is larger than the brake starting maximum voltage value; and if the first target starting voltage value is less than or equal to the maximum braking starting voltage value, taking the first target starting voltage value as a second target starting voltage value.
It should be noted that the converter brake control device of the wind turbine generator system provided in the embodiment of the present invention can implement each process and effect in the method embodiment shown in fig. 2, and the implementation principle of each process is the same, and is not described herein again to avoid repetition.
Fig. 4 shows a hardware structure diagram of a converter brake control device of a wind generating set according to an embodiment of the invention. As shown in fig. 4, the converter brake control device of the wind park may comprise a processor 401 and a memory 402 storing computer program instructions.
Specifically, the processor 401 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing embodiments of the present invention.
The processor 401 reads and executes computer program instructions stored in the memory 402 to implement the converter brake control method of the wind turbine generator system in any one of the above embodiments.
In one example, the converter brake control device of the wind park may further comprise a communication interface 403 and a bus 410. As shown in fig. 4, the processor 401, the memory 402, and the communication interface 403 are connected via a bus 410 to complete communication therebetween.
The communication interface 403 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiments of the present invention.
The bus 410 includes hardware, software, or both that couple the components of the wind turbine generator system's converter brake control device to each other. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-E4press (PCI-4) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus, or a combination of two or more of these. Bus 410 may include one or more buses, where appropriate. Although specific buses have been described and shown in the embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.
The converter brake control device of the wind generating set can execute the converter brake control method of the wind generating set in the embodiment of the invention, thereby realizing the converter brake control method and the converter brake control device of the wind generating set described in combination with fig. 2 and 3.
In addition, in combination with the converter braking control method of the wind turbine generator system in the above embodiment, the embodiment of the present invention may be implemented by providing a computer readable storage medium. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by the processor, implement a converter braking control method of a wind turbine generator system according to any of the above embodiments.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
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 the invention are the programs or code segments 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.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (13)
1. A converter brake control method of a wind generating set is characterized by comprising the following steps:
acquiring the grid side voltage of a converter of the wind generating set;
extracting a positive sequence component and a negative sequence component in the network side voltage;
determining a braking starting voltage value of the converter according to the positive sequence component and the negative sequence component;
and controlling the converter to perform braking operation according to the braking starting voltage value.
2. The method of claim 1, wherein said determining a brake activation voltage value of said converter based on said positive sequence component and said negative sequence component comprises:
obtaining rated reactive current of the converter, inductance value of a network side filter reactor of the converter, angular frequency of network side voltage and preset compensation quantity;
and determining the brake starting voltage value according to the positive sequence component, the negative sequence component, the rated reactive current, the inductance value, the angular frequency and the preset compensation quantity.
3. The method of claim 1, wherein said controlling said converter to perform a braking operation based on said brake initiation voltage value comprises:
acquiring a voltage set value of a direct current bus of the converter;
correcting the brake starting voltage value according to the voltage set value to obtain a corrected first target starting voltage value;
and controlling the converter to perform braking operation according to the first target starting voltage value.
4. The method of claim 3, wherein the modifying the brake actuation voltage value according to the voltage set value to obtain a modified first target actuation voltage value comprises:
calculating a voltage difference between the brake initiation voltage value and the voltage set value;
comparing the voltage difference value with a preset difference value;
if the voltage difference value is larger than the preset difference value, taking the brake starting voltage value as the first target starting voltage value;
and if the voltage difference value is smaller than or equal to the preset difference value, taking the sum of the voltage set value and the preset difference value as the first target starting voltage value.
5. The method of claim 3, wherein said controlling said converter to perform a braking operation based on said first target starting voltage value comprises:
obtaining a maximum brake starting voltage value of the converter;
correcting the first target starting voltage value according to the brake starting maximum voltage value to obtain a corrected second target starting voltage value;
and controlling the converter to perform braking operation according to the second target starting voltage value.
6. The method of claim 5, wherein the modifying the first target starting voltage value according to the brake-starting maximum voltage value to obtain a modified second target starting voltage value comprises:
if the first target starting voltage value is larger than the brake starting maximum voltage value, taking the brake starting maximum voltage value as the second target starting voltage value;
and if the first target starting voltage value is smaller than or equal to the maximum braking starting voltage value, taking the first target starting voltage value as the second target starting voltage value.
7. A converter brake control device of a wind generating set is characterized by comprising:
the grid side voltage acquisition module is used for acquiring the grid side voltage of a converter of the wind generating set;
the component extraction module is used for extracting a positive sequence component and a negative sequence component in the network side voltage;
the voltage determining module is used for determining a braking starting voltage value of the converter according to the positive sequence component and the negative sequence component;
and the brake control module is used for controlling the converter to perform brake operation according to the brake starting voltage value.
8. The apparatus of claim 7, wherein the voltage determination module comprises:
the parameter acquisition unit is used for acquiring rated reactive current of the converter, inductance value of a network side filter reactor of the converter, angular frequency of network side voltage and preset compensation quantity;
and the parameter calculation unit is used for determining the brake starting voltage value according to the positive sequence component, the negative sequence component, the rated reactive current, the inductance value, the angular frequency and the preset compensation quantity.
9. The apparatus of claim 7, wherein the brake control module comprises:
the bus voltage acquisition unit is used for acquiring a voltage set value of a direct current bus of the converter;
the first voltage correction unit is used for correcting the brake starting voltage value according to the voltage set value to obtain a corrected first target starting voltage value;
and the first brake control unit is used for controlling the converter to perform brake operation according to the first target starting voltage value.
10. The apparatus of claim 9, wherein the first voltage modification unit comprises:
a difference value calculating unit for calculating a voltage difference value between the brake-on voltage value and the voltage set value;
the difference comparison unit is used for comparing the voltage difference with a preset difference;
a first voltage determining unit, configured to take the brake starting voltage value as the first target starting voltage value if the voltage difference value is greater than the preset difference value; and if the voltage difference value is smaller than or equal to the preset difference value, taking the sum of the voltage set value and the preset difference value as the first target starting voltage value.
11. The apparatus of claim 9, wherein the brake control module comprises:
the starting voltage obtaining unit is used for obtaining the maximum braking starting voltage value of the converter;
the second voltage correction unit is used for correcting the first target starting voltage value according to the brake starting maximum voltage value to obtain a corrected second target starting voltage value;
and the second brake control unit is used for controlling the converter to perform brake operation according to the second target starting voltage value.
12. The apparatus of claim 11, wherein the second voltage modification unit comprises:
a second voltage determining unit, configured to, if the first target starting voltage value is greater than the brake starting maximum voltage value, use the brake starting maximum voltage value as the second target starting voltage value; and if the first target starting voltage value is smaller than or equal to the maximum braking starting voltage value, taking the first target starting voltage value as the second target starting voltage value.
13. The apparatus of claim 7, wherein the apparatus is disposed within a converter controller of the converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911347695.XA CN113036740A (en) | 2019-12-24 | 2019-12-24 | Converter brake control method and device of wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911347695.XA CN113036740A (en) | 2019-12-24 | 2019-12-24 | Converter brake control method and device of wind generating set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113036740A true CN113036740A (en) | 2021-06-25 |
Family
ID=76451692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911347695.XA Pending CN113036740A (en) | 2019-12-24 | 2019-12-24 | Converter brake control method and device of wind generating set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113036740A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441686A (en) * | 2013-09-04 | 2013-12-11 | 北京天诚同创电气有限公司 | Control system and method for braking module of DC busbars of wind-power current transformer |
| CN106611960A (en) * | 2015-10-27 | 2017-05-03 | 中国电力科学研究院 | High-voltage ride-through method for double-fed wind turbine generator set |
| US20170133971A1 (en) * | 2014-07-02 | 2017-05-11 | Ge Energy Power Conversion Technology Ltd | Overvoltage protection self-trigger circuit for double fed induction generator (dfig) wind power system |
| CN106786611A (en) * | 2016-12-12 | 2017-05-31 | 国网山东省电力公司青岛供电公司 | A kind of line voltage control method and device |
| CN108123486A (en) * | 2016-11-30 | 2018-06-05 | 北京金风科创风电设备有限公司 | The control method and device of wind electric converter low voltage crossing |
| WO2018107775A1 (en) * | 2016-12-12 | 2018-06-21 | 北京金风科创风电设备有限公司 | Control method and device for wind farm, and wind power generation system |
| CN108258716A (en) * | 2016-12-28 | 2018-07-06 | 北京金风科创风电设备有限公司 | The parameter determination method and device of current transformer braking resistor |
| CN108322128A (en) * | 2018-03-09 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of motor driving protective device, over-voltage protection method, device and air conditioner |
| CN108540039A (en) * | 2017-03-06 | 2018-09-14 | Ls产电株式会社 | Inverter control device |
| CN109995068A (en) * | 2017-12-29 | 2019-07-09 | 北京金风科创风电设备有限公司 | Fault ride-through control apparatus and method |
| CN110299721A (en) * | 2018-03-23 | 2019-10-01 | 北京金风科创风电设备有限公司 | Braking power control method and device and wind generating set |
-
2019
- 2019-12-24 CN CN201911347695.XA patent/CN113036740A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441686A (en) * | 2013-09-04 | 2013-12-11 | 北京天诚同创电气有限公司 | Control system and method for braking module of DC busbars of wind-power current transformer |
| US20170133971A1 (en) * | 2014-07-02 | 2017-05-11 | Ge Energy Power Conversion Technology Ltd | Overvoltage protection self-trigger circuit for double fed induction generator (dfig) wind power system |
| CN106611960A (en) * | 2015-10-27 | 2017-05-03 | 中国电力科学研究院 | High-voltage ride-through method for double-fed wind turbine generator set |
| CN108123486A (en) * | 2016-11-30 | 2018-06-05 | 北京金风科创风电设备有限公司 | The control method and device of wind electric converter low voltage crossing |
| CN106786611A (en) * | 2016-12-12 | 2017-05-31 | 国网山东省电力公司青岛供电公司 | A kind of line voltage control method and device |
| WO2018107775A1 (en) * | 2016-12-12 | 2018-06-21 | 北京金风科创风电设备有限公司 | Control method and device for wind farm, and wind power generation system |
| CN108258716A (en) * | 2016-12-28 | 2018-07-06 | 北京金风科创风电设备有限公司 | The parameter determination method and device of current transformer braking resistor |
| CN108540039A (en) * | 2017-03-06 | 2018-09-14 | Ls产电株式会社 | Inverter control device |
| CN109995068A (en) * | 2017-12-29 | 2019-07-09 | 北京金风科创风电设备有限公司 | Fault ride-through control apparatus and method |
| CN108322128A (en) * | 2018-03-09 | 2018-07-24 | 奥克斯空调股份有限公司 | A kind of motor driving protective device, over-voltage protection method, device and air conditioner |
| CN110299721A (en) * | 2018-03-23 | 2019-10-01 | 北京金风科创风电设备有限公司 | Braking power control method and device and wind generating set |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9353732B2 (en) | Method of operating a wind turbine as well as a system suitable therefor | |
| CN109672210B (en) | Converter, and high voltage ride through control method and device of converter | |
| CN108983096B (en) | Method for determining power of high-voltage motor and measuring device | |
| JP6559501B2 (en) | Control device for power converter | |
| CN108933540B (en) | Fault quick recovery control method and device for flexible direct current transmission system | |
| CN110907859A (en) | Open-circuit fault diagnosis method for voltage source type inverter in UPS system | |
| CN110556783B (en) | Zero sequence overcurrent protection method and device for transformer | |
| CN110601245A (en) | Method and system for checking transient overvoltage after extra-high voltage direct current fault | |
| CN109088425A (en) | A kind of commutation failure prevention method based on ac bus voltage disturbance amount | |
| CN112557961B (en) | Method for judging fault of double-fed wind power plant outgoing line | |
| US11817712B2 (en) | High-low voltage continuous ride-through control method and system for permanent magnet direct-drive wind power generating set | |
| CN104242346B (en) | A kind of LVRT Capability of Wind Turbine Generator control method | |
| JP2020150768A (en) | Power control device | |
| CN113036740A (en) | Converter brake control method and device of wind generating set | |
| US11677345B2 (en) | Control method and system for continuous high and low voltage ride through of permanent-magnet direct-drive wind-driven generator set | |
| CN110323776B (en) | SC-based L CC-HVDC receiving end direct current system feedforward control method, system and medium | |
| CN110939542B (en) | Mechanical brake input method and device for pumped storage unit | |
| CN111030438B (en) | Method and device for resisting network disturbance of four-quadrant frequency converter | |
| CN108471140B (en) | Double-fed fan low-voltage ride-through control method and device | |
| CN113746139B (en) | Control method and device of off-grid power supply system | |
| CN111952989A (en) | Control method and system of four-quadrant converter | |
| CN111181150B (en) | Method and device for determining power grid voltage drop reason and wind power generation system | |
| CN112701732B (en) | Control method and device for virtual synchronous generator and storage medium | |
| CN103901285A (en) | Method for detecting cascading type high-voltage inverter power unit input default phase | |
| CN111509669B (en) | Rotor current protection method and system for synchronous phase modulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |