CN110995015B - Soaking control method, device, system, equipment and medium for wind power converter - Google Patents

Soaking control method, device, system, equipment and medium for wind power converter Download PDF

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CN110995015B
CN110995015B CN201911337924.XA CN201911337924A CN110995015B CN 110995015 B CN110995015 B CN 110995015B CN 201911337924 A CN201911337924 A CN 201911337924A CN 110995015 B CN110995015 B CN 110995015B
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converter
switch group
shell temperature
switchable
power
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CN110995015A (en
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卢钢
程攀
蒋侃
石顺风
江日臻
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ZHEJIANG HRV ELECTRIC CO Ltd
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ZHEJIANG HRV ELECTRIC CO Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • 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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  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The application discloses a wind power converter soaking control method, device, system and equipment and a computer readable storage medium, wherein the method comprises the following steps: obtaining a shell temperature difference by using a first shell temperature of a first IGBT module in a first switchable converter and a second shell temperature of a second IGBT module in a second switchable converter; obtaining a loss power difference by utilizing the machine side total loss power and the network side total loss power; calculating to obtain a rotation duty ratio which enables the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference; on-off control signals of the two switch groups are obtained by utilizing the alternate duty ratio; and controlling the corresponding switch group according to the on-off control signal so as to realize seamless alternation of the first switchable converter and the second switchable converter at the machine side and the network side. According to the technical scheme, heat distribution balance is achieved through the rotation of the first switchable converter and the second switchable converter on the machine side and the grid side, so that the maximum capacity and the power density of the wind power converter are improved.

Description

Soaking control method, device, system, equipment and medium for wind power converter
Technical Field
The application relates to the technical field of wind power, in particular to a soaking control method, device, system and equipment for a wind power converter and a computer readable storage medium.
Background
With the continuous development of wind power technology, the wind power industry is primarily expanding from land wind power to offshore wind power, and the single machine capacity of a wind turbine generator is continuously expanding, wherein a single machine 8-10MW wind power converter represents the highest level of the domestic wind power converter technology. The volume and the weight of the large-capacity wind power converter are strictly limited by the installation environment of the wind power cabin, the requirement of high power density needs to be met, and accordingly, severe requirements are provided for the thermal design and the thermal balance of the wind power converter.
Referring to fig. 1, a schematic structural diagram of an existing wind power converter is shown, which includes a motor-side converter connected to a wind power generator (i.e., located on a machine side of the wind power converter), a grid-side converter connected to a power grid (i.e., located on a grid side of the wind power converter), and an intermediate dc unit, where the motor-side converter and the grid-side converter generally adopt a completely consistent electrical structure, so as to shorten a development period, reduce an assembly difficulty, and improve convenience of future maintenance.
However, the operation conditions of the machine side and the grid side of the wind power converter are different (the machine side is a variable frequency rectification condition, and the grid side is a constant frequency inversion condition), so that the total heat productivity and the heat loss distribution of the power devices on the machine side and the grid side of the wind power converter are greatly different. Specifically, the heat productivity of the motor-side converter and the grid-side converter under the rated working condition tends to be consistent, but when the wind speed is low and the torque is high, the total heat productivity of the motor-side converter is obviously higher than that of the grid-side converter, and for the heat loss, the heat loss of the motor-side converter is mainly concentrated on the diodes, and the heat loss of the grid-side converter is mainly concentrated on the IGBTs, which can cause the heat weakness of the motor-side converter to be at the junction temperature of the IGBTs and the heat weakness of the grid-side converter to be at the junction temperature of the diodes, thus causing the motor-side converter and the grid-side converter to be unable to achieve the heat distribution balance, thereby causing the limitation on the maximum capacity of the wind power converter and being not beneficial to the improvement of the power density of the.
In summary, how to achieve the heat distribution balance of the motor-side converter and the grid-side converter so as to improve the maximum capacity and the power density of the wind power converter is a technical problem to be solved urgently by those skilled in the art at present.
Disclosure of Invention
In view of the above, an object of the present application is to provide a soaking control method, device, apparatus and computer readable storage medium for a wind power converter, which are used to achieve heat distribution balance between a motor-side converter and a grid-side converter, so as to improve the maximum capacity and power density of the wind power converter.
In order to achieve the above purpose, the present application provides the following technical solutions:
a soaking control method of a wind power converter comprises the following steps:
acquiring a first shell temperature of a first IGBT module in a first switchable converter and a second shell temperature of a second IGBT module in a second switchable converter, and acquiring a shell temperature difference by using the first shell temperature and the second shell temperature;
obtaining machine side total loss power and network side total loss power of a wind power converter, and obtaining a loss power difference by using the machine side total loss power and the network side total loss power;
calculating a rotation duty ratio for enabling the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference;
obtaining on-off control signals of two switch groups in the machine network switching assembly by utilizing the switching duty ratio; the on-off control signal of a first switch group is opposite to the on-off control signal of a second switch group, the first switch group comprises a first sub-switch group connected with the first switchable converter and the wind driven generator and a second sub-switch group connected with the second switchable converter and the power grid, and the second switch group comprises a third sub-switch group connected with the first switchable converter and the power grid and a fourth sub-switch group connected with the second switchable converter and the wind driven generator;
and when the paired phase pulses of the machine side and the network side are in the same phase, controlling the corresponding switch group according to the on-off control signal so as to realize seamless rotation of the first switchable converter and the second switchable converter at the machine side and the network side.
Preferably, calculating a duty ratio for rotating the first shell temperature to be equal to the second shell temperature from the shell temperature difference and the power loss difference includes:
by using
Figure BDA0002331460090000021
Obtaining D';
according to
Figure BDA0002331460090000031
D is obtained;
wherein D' is the adjusted duty cycle and Δ P is the work lossDifference, K is power conversion coefficient, Δ TCFor the shell temperature difference, KP、KIAs a parameter of the PI regulator, DmaxIs the maximum amplitude of the duty cycle, DminAnd D is the minimum amplitude limit value of the duty ratio, and D is the alternating duty ratio.
Preferably, the obtaining of the on-off control signals of the two switch groups in the grid switching assembly by using the switching duty ratio includes:
and setting the rotation periods of the first switchable converter and the second switchable converter at the machine side and the network side as T, and comparing the rotation duty ratio D with the triangular carrier wave with the period of T to obtain on-off control signals of each switch group.
Preferably, the acquiring a first case temperature of a first IGBT module in the first switchable converter and a second case temperature of a second IGBT module in the second switchable converter includes:
obtaining the first shell temperature by using the resistance value of an NTC thermistor in the first IGBT module;
and obtaining the second shell temperature by using the resistance value of the NTC thermistor in the second IGBT module.
Preferably, obtaining the total machine side loss power and the total grid side loss power of the wind power converter includes:
obtaining the current effective value I of the machine side of the wind power converterMNet side effective value of current IG；
Using said current effective value IMPerforming table lookup to obtain the heat loss power P of the IGBT contained in the IGBT module in the switchable converter at the machine sideIGBT_MAnd the heat loss power P of the diodeD_MThrough PM＝PIGBT_M+PD_MGet total power loss P of machine sideM；
Using said current effective value IGPerforming table lookup to obtain the heat loss power P of the IGBT contained in the IGBT module in the switchable converter positioned on the network sideIGBT_GAnd the heat loss power P of the diodeD_GThrough PG＝PIGBT_G+PD_GObtaining the total loss power P of the network sideG。
Preferably, the switches in the first switch group and the switches in the second switch group are both reverse resistance GTO or reverse resistance IGCT connected in parallel in an opposite direction.
A soaking control device of a wind power converter comprises:
the first obtaining module is used for obtaining a first shell temperature of a first IGBT module in a first switchable converter and a second shell temperature of a second IGBT module in a second switchable converter, and obtaining a shell temperature difference by utilizing the first shell temperature and the second shell temperature;
the second obtaining module is used for obtaining the machine side total loss power of the first IGBT module and the network side total loss power of the second IGBT module, and obtaining a loss power difference by using the machine side total loss power and the network side total loss power;
the calculation module is used for calculating a rotation duty ratio which enables the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference;
the on-off control signal setting module is used for obtaining on-off control signals of two switch groups in the machine network switching assembly by utilizing the switching duty ratio; the on-off control signal of a first switch group is opposite to the on-off control signal of a second switch group, the first switch group comprises a first sub-switch group connected with the first switchable converter and the wind driven generator and a second sub-switch group connected with the second switchable converter and the power grid, and the second switch group comprises a third sub-switch group connected with the first switchable converter and the power grid and a fourth sub-switch group connected with the second switchable converter and the wind driven generator;
and the control module is used for controlling the corresponding switch group according to the on-off control signal when the paired phase pulses of the machine side and the network side are in the same phase so as to realize seamless rotation of the first switchable converter and the second switchable converter on the machine side and the network side.
A soaking control system of a wind power converter comprises the wind power converter and a controller connected with the wind power converter, wherein:
the wind power converter comprises a first switchable converter, a second switchable converter, a middle direct current unit connected with the first switchable converter and the second switchable converter, a machine network switching assembly, a first switch group and a second switch group, wherein the first switch group and the second switch group are arranged in the machine network switching assembly; the first switch group comprises a first sub switch group connected with the first switchable converter and the wind driven generator, and a second sub switch group connected with the second switchable converter and the power grid; the second switch group comprises a third sub switch group connected with the first switchable converter and the power grid and a fourth sub switch group connected with the second switchable converter and the wind driven generator;
the controller is used for executing the steps of the wind power converter soaking control method.
A wind power converter soaking control device comprises:
a memory for storing a computer program;
and the processor is used for realizing the steps of the wind power converter soaking control method when the computer program is stored.
A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a wind power converter soaking control method according to any one of the preceding claims.
The application provides a wind power converter soaking control method, device and equipment and a computer readable storage medium, wherein the method comprises the following steps: acquiring a first shell temperature of a first IGBT module in a first switchable converter and a second shell temperature of a second IGBT module in a second switchable converter, and acquiring a shell temperature difference by using the first shell temperature and the second shell temperature; acquiring machine side total loss power and network side total loss power of the wind power converter, and obtaining a loss power difference by utilizing the machine side total loss power and the network side total loss power; calculating to obtain a rotation duty ratio which enables the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference; obtaining on-off control signals of two switch groups in the machine network switching assembly by utilizing the switching duty ratio; the second switch group comprises a third sub switch group connected with the first switchable converter and the power grid and a fourth sub switch group connected with the second switchable converter and the wind driven generator; when the paired phase pulses of the machine side and the network side are in the same phase, the corresponding switch group is controlled according to the on-off control signal, so that seamless alternation of the first switchable converter and the second switchable converter on the machine side and the network side is realized.
According to the technical scheme disclosed by the application, the shell temperature difference between a first IGBT module in a first switchable converter and a second IGBT module in a second switchable converter is obtained, the loss power difference between the machine side and the network side is obtained, the alternation duty ratio which enables the first shell temperature to be equal to the second shell temperature is obtained through the shell temperature difference and the loss power difference, the on-off control signals of two switch groups connected with a wind driven generator, a power grid, the first switchable converter and the second switchable converter are obtained through the alternation duty ratio, when paired phase pulses of the machine side and the network side are in the same phase, the corresponding switch groups are controlled according to the on-off control signals, the seamless alternation of the first switchable converter and the second switchable converter on the machine side and the network side is realized, and therefore the shell temperature of the first IGBT module in the first switchable converter can be equal to the shell temperature of the second IGBT module in the second switchable converter, so that the machine side and the grid side of the wind power converter can be in heat distribution balance, and the maximum capacity and the power density of the wind power converter can be further improved conveniently.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a conventional wind power converter;
fig. 2 is a flowchart of a soaking control method of a wind power converter provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of a wind power converter provided in the embodiment of the present application;
fig. 4 is a flow chart of soaking control of the wind power converter provided in the embodiment of the present application;
FIG. 5 is a schematic diagram of a distribution of regions allowing rotation for one of the paired phases according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a soaking control device of a wind power converter provided in the embodiment of the present application;
fig. 7 is a schematic structural diagram of a soaking control device of a wind power converter according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 2 to 4, in which fig. 2 shows a flow chart of a wind power converter soaking control method provided by the embodiment of the present application, fig. 3 shows a structural schematic diagram of the wind power converter provided by the embodiment of the present application, and fig. 4 shows a flow chart of the wind power converter soaking control provided by the embodiment of the present application. The soaking control method for the wind power converter provided by the embodiment of the application can comprise the following steps:
s11: the method comprises the steps of obtaining a first shell temperature of a first IGBT module in a first switchable converter and a second shell temperature of a second IGBT module in a second switchable converter, and obtaining a shell temperature difference by utilizing the first shell temperature and the second shell temperature.
In the running process of the wind power converter, the first shell temperature T of the first IGBT module in the first switchable converter is obtained in real time1CAnd acquiring the second shell temperature T of the second IGBT module in the second switchable converter in real time2CThen, using the first shell temperature T1CAnd a second shell temperature T2CBy Δ TC＝T1C-T2CTo obtain a shell temperature difference Delta TC。
The first switchable converter and the second switchable converter have the same structure, and both the first switchable converter and the second switchable converter can be used as a machine-side converter connected with the wind driven generator and a grid-side converter connected with a power grid. In the process of obtaining the shell temperature, the first shell temperature corresponds to the shell temperature of the first switchable converter IGBT module, and the second shell temperature corresponds to the shell temperature of the second switchable converter IGBT module.
S12: acquiring machine side total loss power and network side total loss power of the wind power converter, and obtaining a loss power difference by utilizing the machine side total loss power and the network side total loss power;
the total machine side loss power P of the wind power converter can be obtained while the first shell temperature of the first IGBT module and the second shell temperature of the second IGBT module are obtainedMSum network side total power loss PGAnd by Δ P ═ PM-PGThe power loss difference ap is obtained.
S13: and calculating to obtain a rotation duty ratio which enables the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference.
With the aim of equalizing the first shell temperature and the second shell temperature (i.e. with the aim of equalizing the shell temperatures or with the aim of equalizing the shell temperature difference to 0), the shell temperature difference Δ T is obtained as described aboveCAnd the loss power difference delta P is obtained to obtain the rotation duty ratio of two switch groups in the machine net rotation component so as to obtain the current shell temperature difference delta TCAnd the specific situation that the first switchable converter and the second switchable converter are required to be switched on or off under the condition of power loss difference delta P, therebyThe shell temperatures of the first switchable converter and the second switchable converter can be consistent to eliminate the influence of the heat weak point, and further the maximum power capacity and the limit power density of the wind power converter are improved conveniently.
S14: and obtaining on-off control signals of two switch groups in the machine network switching assembly by utilizing the switching duty ratio.
The on-off control signal of the first switch group is opposite to the on-off control signal of the second switch group, the first switch group comprises a first sub-switch group connected with the first switchable converter and the wind driven generator and a second sub-switch group connected with the second switchable converter and the power grid, and the second switch group comprises a third sub-switch group connected with the first switchable converter and the power grid and a fourth sub-switch group connected with the second switchable converter and the wind driven generator.
The wind power converter provided by the application is provided with a grid conversion assembly connected with a first switchable converter, a second switchable converter, a wind driven generator and a power grid, wherein the grid conversion assembly internally comprises a first switch group and a second switch group, the first switch group comprises a first sub-switch group (specifically, U1, V1 and W1 in fig. 3) connected with the first switchable converter and the wind driven generator, a second sub-switch group (specifically, a2, B2 and C2 in fig. 3) connected with the second switchable converter and the power grid, and the second switch group comprises a third sub-switch group (specifically, a1, B1 and C1 in fig. 3) connected with the first switchable converter and the power grid, and a fourth sub-switch group (specifically, U2, V2 and W2 in fig. 3) connected with the second switchable converter and the wind driven generator. When the switches in the first switch group are closed and the switches in the second switch group are opened, the first switchable converter is connected with the wind driven generator, the second switchable converter is connected with the power grid, and at the moment, the first switchable converter is used as a machine side converter, and the second switchable converter is used as a grid side converter; when the switches in the first switch group are turned off and the switches in the second switch group are turned on, the first switchable converter is connected with the power grid, the second switchable converter is connected with the wind driven generator, and at the moment, the first switchable converter is used as a grid-side converter, and the second switchable converter is used as a machine-side converter.
After the alternating duty ratio is obtained, on-off control signals of a first switch group and a second switch group in the grid alternating assembly can be obtained according to the alternating duty ratio, wherein the on-off control signals of the first switch group and the second switch group are opposite, so that the first switchable converter is connected with the wind driven generator, the second switchable converter is connected with the grid, or the first switchable converter is connected with the grid, and the second switchable converter is connected with the wind driven generator, so that even if heat dissipation environments of cabinets where the first switchable converter and the second switchable converter are located are inconsistent and operating conditions are inconsistent, the temperature of an IGBT shell inside the first switchable converter and the temperature of a diode junction inside the second switchable converter are still adjustable and consistent, the influence of thermal thinness is eliminated, and the machine side and the grid side of the wind driven generator converter can reach thermal distribution weakness, and then the maximum power capacity of the wind power converter can be dynamically improved when the operation environment changes.
S15: when the paired phase pulses of the machine side and the network side are in the same phase, the corresponding switch group is controlled according to the on-off control signal, so that seamless alternation of the first switchable converter and the second switchable converter on the machine side and the network side is realized.
Referring to fig. 5, a schematic diagram of a distribution of regions that allow rotation to be performed for one of the paired phases according to the embodiment of the present application is shown.
After the on-off control signals of the two switch groups are obtained, considering that the operation conditions of the machine side and the network side are different, therefore, in order to ensure that the two switch groups do not generate current impact during switching, the switch groups need to be alternated when paired phase pulses of the machine side and the network side are in the same phase, namely, the on-off control signals do not immediately alternate when jumping occurs, only when the paired phases of the machine side and the network side have the same switching frequency and synchronous switching period and the paired phase pulses are in the same phase, the corresponding switch groups are allowed to be controlled according to the on-off control signals, namely, the switch of each switch group is allowed to be performed, so that the alternation of the first switchable converter and the second switchable converter on the machine side and the network side is realized, and the first switchable converter and the second switchable converter can realize thermal balanced distribution. As shown in fig. 5, in the period T, only the pulses in the three intervals 1, 2, and 3 remain in phase in the paired phase of the machine side U phase and the grid side a, and therefore, only the three intervals 1, 2, and 3 allow the first switchable converter and the second switchable converter a to be rotated. It should be noted that, in the wind power converter provided in fig. 3, the paired phases are: the machine side U phase is connected with the net side A phase, the machine side V phase is connected with the net side B phase, the machine side W phase is connected with the net side C phase.
According to the technical scheme disclosed by the application, the shell temperature difference between a first IGBT module in a first switchable converter and a second IGBT module in a second switchable converter is obtained, the loss power difference between the machine side and the network side is obtained, the alternation duty ratio which enables the first shell temperature to be equal to the second shell temperature is obtained through the shell temperature difference and the loss power difference, the on-off control signals of two switch groups connected with a wind driven generator, a power grid, the first switchable converter and the second switchable converter are obtained through the alternation duty ratio, when paired phase pulses of the machine side and the network side are in the same phase, the corresponding switch groups are controlled according to the on-off control signals, the alternation of the first switchable converter and the second switchable converter on the machine side and the network side is realized, and therefore the shell temperature of the first IGBT module in the first switchable converter can be equal to the shell temperature of the second IGBT module in the second switchable converter, so that the machine side and the grid side of the wind power converter can be in heat distribution balance, and the maximum capacity and the power density of the wind power converter can be further improved conveniently.
The soaking control method for the wind power converter provided by the embodiment of the application calculates the rotation duty ratio for enabling the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference, and can include the following steps:
by using
Figure BDA0002331460090000091
Obtaining D';
according to
Figure BDA0002331460090000092
D is obtained;
wherein D' is the adjusted duty ratio, Δ P is the power loss difference, K is the power conversion coefficient, and Δ TCIs the shell temperature difference, KP、KIAs a parameter of the PI regulator, DmaxIs the maximum amplitude of the duty cycle, DminAnd D is the minimum amplitude limit value of the duty ratio, and D is the alternating duty ratio.
When the alternation duty ratio is calculated, the shell temperature difference delta T can be specifically calculatedCAnd the loss power difference delta P is corrected for 0.5 through a PI regulator to obtain the adjusted duty ratio, and the alternation duty ratio is obtained according to the relationship between the adjusted duty ratio and the maximum amplitude limit value and the minimum amplitude limit value of the duty ratio. Where 0.5 represents that the first switchable converter and the second switchable converter are operated on the machine side (or on the grid side) in half in one cycle, i.e. that the first switchable converter is operated on the machine side for half the time and on the grid side for half the time in one cycle.
In particular, see FIG. 4, using
Figure BDA0002331460090000101
Obtaining the adjusted duty ratio D' according to
Figure BDA0002331460090000102
Resulting in a commutating duty cycle D. Wherein, KP、KIFor the parameters of the PI regulator, K is the power conversion factor, DmaxIs the maximum amplitude of the duty cycle, DminIs the duty cycle minimum amplitude limit, KP、KIThe parameters associated with K need to be determined for a particular application, and are not fixed, DmaxAnd DminGenerally set at 0.5 as the center point, specifically, DmaxCan be 0.7, DminMay be 0.3.
The soaking control method for the wind power converter provided by the embodiment of the application utilizes the rotation duty ratio to obtain the on-off control signals of the two switch groups in the grid rotation assembly, and can comprise the following steps:
and setting the rotation periods of the machine side and the network side of the first switchable converter and the second switchable converter as T, and comparing the rotation duty ratio D with the triangular carrier wave with the period of T to obtain the on-off control signal of each switch group.
When the on-off control signals of the first switch group and the second switch group are obtained by using the duty ratios, the rotation periods of the first switchable converter and the second switchable converter on the machine side and the network side may be set to be T, the rotation duty ratio D is compared with the triangular carrier with the period of T (see specifically fig. 4), when the rotation duty ratio is greater than or equal to the triangular carrier, U1, V1, W1, a2, B2, and C2 in fig. 4 are turned on, and when the rotation duty ratio is smaller than the triangular carrier, U1, V1, W1, a2, B2, and C2 are turned off, and the control signals corresponding to U2, V2, W2, a1, B1, and C1 are logically opposite to U1, V5739, W1, a2, B2, and C2.
In consideration of the temperature change of the IGBT, there is a slow process, and therefore, the rotation period T may be set in the ms level, the hundred ms level, or even the s level, which can be referred to specifically as the description of the transient thermal impedance in the IGBT parameter manual.
The soaking control method for the wind power converter provided by the embodiment of the application obtains the first shell temperature of the first IGBT module in the first switchable converter and the second shell temperature of the second IGBT module in the second switchable converter, and can include the following steps:
obtaining a first shell temperature by using the resistance value of an NTC thermistor in the first IGBT module;
and obtaining the second shell temperature by using the resistance value of the NTC thermistor in the second IGBT module.
When the first shell temperature and the second shell temperature are obtained, the resistance value of the NTC thermistor in the first IGBT module and the resistance value of the NTC thermistor in the second IGBT module can be obtained respectively, and then the first shell temperature and the second shell temperature are obtained through the correspondence between the resistance value change of the NTC thermistor and the shell temperature of the IGBT module.
The corresponding relation between the resistance value of the NTC thermistor and the temperature of the IGBT module shell can specifically refer to a parameter manual of the IGBT.
The soaking control method for the wind power converter, provided by the embodiment of the application, is used for obtaining the machine side total loss power and the grid side total loss power of the wind power converter, and comprises the following steps:
obtaining the current effective value I of the machine side of the wind power converterMNet side effective value of current IG；
Using said current effective value IMPerforming table lookup to obtain the heat loss power P of the IGBT contained in the IGBT module in the switchable converter at the machine sideIGBT_MAnd the heat loss power P of the diodeD_MThrough PM＝PIGBT_M+PD_MGet total power loss P of machine sideM；
Using said current effective value IGPerforming table lookup to obtain the heat loss power P of the IGBT contained in the IGBT module in the switchable converter positioned on the network sideIGBT_GAnd the heat loss power P of the diodeD_GThrough PG＝PIGBT_G+PD_GObtaining the total loss power P of the network sideG。
Specifically, the total machine side power loss P can be obtained as followsMNet side total power loss PG：
Obtaining current effective value I of machine side of wind power converterMNet side effective value of current IGThen, according to the effective value I of the current on the machine sideMA look-up table is made to obtain the heat loss power P of the IGBTs comprised by the IGBT module in the switchable converter currently located at the machine side (which may be the first switchable converter or the second switchable converter)IGBT_MAnd the heat loss power P of the diodeD_MThen, by PM＝PIGBT_M+PD_MGet total power loss P of machine sideM；
At the same time, according to the effective value I of the current on the network sideGA look-up table is made to obtain the heat loss power P of the IGBTs included in the IGBT module in the switchable converter currently on the grid side (corresponding to the switchable converter on the grid side, which may be the second switchable converter or the first switchable converter)IGBT_GAnd the heat loss power P of the diodeD_GThen, by PG＝PIGBT_G+PD_GTo obtain the total loss of the network sidePower consumption PG。
The relationship between the effective current value and the heat dissipation power of the IGBT and the diode can be obtained by thermal calculation software given by the IGBT manufacturer, for example: the IPOSIM thermal simulation software can be used by the IGBT module of the English flying, the result of simulation calculation is stored in the controller, and the thermal loss power can be obtained by looking up a table during operation.
According to the soaking control method for the wind power converter, the switches in the first switch group and the switches in the second switch group are reverse resistance GTO or reverse resistance IGCT which are reversely connected in parallel.
Considering that the switches in the first switch group and the second switch group need to conduct current for a long time and perform switching rapidly, and the switching period can be more than several hundreds of ms or even s level in combination with the above-mentioned knowledge, therefore, low-switching-frequency devices with fast switching speed, small on-resistance and reverse blocking characteristics can be used as the switches in the first switch group and the second switch group, and specifically, reverse-resistance GTO (gate turn-off thyristor) or reverse-resistance IGCT (integrated gate-commutated thyristor) in reverse parallel can be used as the switches in the first switch group and the second switch group. Of course, other switch tubes may be used as the switches in the first switch group and the second switch group, which is not limited in this application.
As shown in fig. 3, assuming that the switches in the first switch group and the second switch group are both formed by reverse resistance GTO in reverse parallel, the rated frequency of the wind turbine is 50Hz, the actual operating frequency is 45Hz, and the grid-side converter operates at 50Hz, because the operating conditions of the grid are different, if no rotation operation is performed, the current effective value of the machine-side converter is slightly higher than that of the grid-side converter, the heat generation is also more, and the shell temperature of the machine-side IGBT module is higher than that of the grid-side IGBT module, wherein the hottest point inside the machine-side IGBT module is a diode, the hottest point inside the grid-side IGBT module is an IGBT, the weak point of the whole system is the diode junction temperature of the machine-side IGBT module, which limits the increase of the overall capacity of the wind power converter, after the control is performed according to the above-mentioned procedures, the shell temperatures of the IGBT modules, the IGBT junction temperatures of the first switchable, the thermal weakness is eliminated, so that the maximum operable power and the limit power density of the wind power converter can be improved.
The embodiment of the present application further provides a wind power converter soaking control device, refer to fig. 6, which shows a schematic structural diagram of the wind power converter soaking control device provided by the embodiment of the present application, and the wind power converter soaking control device may include:
the first obtaining module 61 is configured to obtain a first shell temperature of a first IGBT module in the first switchable converter and a second shell temperature of a second IGBT module in the second switchable converter, and obtain a shell temperature difference by using the first shell temperature and the second shell temperature;
the second obtaining module 62 is configured to obtain machine side total loss power and grid side total loss power of the wind power converter, and obtain a loss power difference by using the machine side total loss power and the grid side total loss power;
a calculation module 63, configured to calculate, according to the shell temperature difference and the power loss difference, a rotation duty ratio at which the first shell temperature is equal to the second shell temperature;
an on-off control signal setting module 64, configured to obtain on-off control signals of two switch groups in the grid switching assembly by using the switching duty ratio; the second switch group comprises a third sub switch group connected with the first switchable converter and the power grid and a fourth sub switch group connected with the second switchable converter and the wind driven generator;
and the control module 65 is configured to control the corresponding switch group according to the on-off control signal when the paired phase pulses of the machine side and the grid side are in the same phase, so as to implement seamless rotation of the first switchable converter and the second switchable converter on the machine side and the grid side.
The embodiment of the application provides a wind power converter soaking control device, calculation module 63 can include:
a first computing unit for utilizing
Figure BDA0002331460090000131
Obtaining D';
a second calculation unit for calculating based on
Figure BDA0002331460090000132
D is obtained;
wherein D' is the adjusted duty ratio, Δ P is the power loss difference, K is the power conversion coefficient, and Δ TCIs the shell temperature difference, KP、KIAs a parameter of the PI regulator, DmaxIs the maximum amplitude of the duty cycle, DminAnd D is the minimum amplitude limit value of the duty ratio, and D is the alternating duty ratio.
The embodiment of the application provides a wind power converter soaking control device, it can include to obtain on-off control signal module 64:
and the comparison unit is used for setting the rotation periods of the machine side and the network side of the first switchable converter and the second switchable converter as T, and comparing the rotation duty ratio D with the triangular carrier wave with the period as T to obtain the on-off control signal of each switch group.
The embodiment of the application provides a wind power converter soaking control device, first module 61 of acquireing can include:
the first obtaining unit is used for obtaining a first shell temperature by using the resistance value of the NTC thermistor in the first IGBT module;
and a second obtaining unit for obtaining a second case temperature using a resistance value of the NTC thermistor in the second IGBT module.
The embodiment of the application provides a wind power converter soaking control device, the second acquisition module 62 can include:
a third obtaining unit for obtaining the current effective value I of the machine side of the wind power converterMNet side effective value of current IG；
A first look-up table unit for using the current effective value IMPerforming table lookup to obtain the heat loss power P of the IGBT contained in the IGBT module in the switchable converter at the machine sideIGBT_MAnd the heat loss power P of the diodeD_MThrough PM＝PIGBT_M+PD_MGet total power loss P of machine sideM；
A second look-up table unit for using the current effective value IGPerforming table lookup to obtain the heat loss power P of the IGBT contained in the IGBT module in the switchable converter positioned on the network sideIGBT_GAnd the heat loss power P of the diodeD_GThrough PG＝PIGBT_G+PD_GObtaining the total loss power P of the network sideG。
According to the soaking control device for the wind power converter, the switches in the first switch group and the switches in the second switch group are reverse resistance GTO or reverse resistance IGCT which are reversely connected in parallel.
The embodiment of the application also provides a wind power converter soaking control system, including wind power converter, the controller that links to each other with wind power converter, wherein:
the wind power converter comprises a first switchable converter, a second switchable converter, a middle direct current unit connected with the first switchable converter and the second switchable converter, a machine network switching assembly, a first switch group and a second switch group, wherein the first switch group and the second switch group are arranged in the machine network switching assembly; the first switch group comprises a first sub switch group connected with the first switchable converter and the wind driven generator, and a second sub switch group connected with the second switchable converter and the power grid; the second switch group comprises a third sub switch group connected with the first switchable converter and the power grid and a fourth sub switch group connected with the second switchable converter and the wind driven generator;
and the controller is used for executing the steps of any one of the wind power converter soaking control methods.
The structure of the wind power converter is specifically shown in fig. 3.
The embodiment of the present application further provides a wind power converter soaking control device, refer to fig. 7, which shows a schematic structural diagram of the wind power converter soaking control device provided by the embodiment of the present application, and the wind power converter soaking control device may include:
a memory 71 for storing a computer program;
the processor 72, when executing the computer program stored in the memory 71, may implement the following steps:
acquiring a first shell temperature of a first IGBT module in a first switchable converter and a second shell temperature of a second IGBT module in a second switchable converter, and acquiring a shell temperature difference by using the first shell temperature and the second shell temperature; acquiring machine side total loss power and network side total loss power of the wind power converter, and obtaining a loss power difference by utilizing the machine side total loss power and the network side total loss power; calculating to obtain a rotation duty ratio which enables the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference; obtaining on-off control signals of two switch groups in the machine network switching assembly by utilizing the switching duty ratio; the second switch group comprises a third sub switch group connected with the first switchable converter and the power grid and a fourth sub switch group connected with the second switchable converter and the wind driven generator; when the paired phase pulses of the machine side and the network side are in the same phase, the corresponding switch group is controlled according to the on-off control signal, so that the first switchable converter and the second switchable converter are alternated at the machine side and the network side.
The embodiment of the application also provides a computer readable storage medium, a computer program is stored on the computer readable storage medium, and the following steps can be realized when the computer program is executed by a processor;
acquiring a first shell temperature of a first IGBT module in a first switchable converter and a second shell temperature of a second IGBT module in a second switchable converter, and acquiring a shell temperature difference by using the first shell temperature and the second shell temperature; acquiring machine side total loss power and network side total loss power of the wind power converter, and obtaining a loss power difference by utilizing the machine side total loss power and the network side total loss power; calculating to obtain a rotation duty ratio which enables the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference; obtaining on-off control signals of two switch groups in the machine network switching assembly by utilizing the switching duty ratio; the second switch group comprises a third sub switch group connected with the first switchable converter and the power grid and a fourth sub switch group connected with the second switchable converter and the wind driven generator; when the paired phase pulses of the machine side and the network side are in the same phase, the corresponding switch group is controlled according to the on-off control signal, so that the first switchable converter and the second switchable converter are alternated at the machine side and the network side.
The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
For the descriptions of the related parts in the wind power converter soaking control device, the system, the equipment and the computer readable storage medium provided by the embodiment of the application, reference may be made to the detailed descriptions of the corresponding parts in the wind power converter soaking control method provided by the embodiment of the application, and the descriptions are not repeated here.
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. Furthermore, 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 elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A soaking control method of a wind power converter is characterized by comprising the following steps:
acquiring a first shell temperature of a first IGBT module in a first switchable converter and a second shell temperature of a second IGBT module in a second switchable converter, and acquiring a shell temperature difference by using the first shell temperature and the second shell temperature;
obtaining machine side total loss power and network side total loss power of a wind power converter, and obtaining a loss power difference by using the machine side total loss power and the network side total loss power;
calculating a rotation duty ratio for enabling the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference;
obtaining on-off control signals of two switch groups in the machine network switching assembly by utilizing the switching duty ratio; the on-off control signal of a first switch group is opposite to the on-off control signal of a second switch group, the first switch group comprises a first sub-switch group connected with the first switchable converter and the wind driven generator and a second sub-switch group connected with the second switchable converter and the power grid, and the second switch group comprises a third sub-switch group connected with the first switchable converter and the power grid and a fourth sub-switch group connected with the second switchable converter and the wind driven generator;
when paired phase pulses of the machine side and the network side are in the same phase, controlling the corresponding switch group according to the on-off control signal so as to realize seamless rotation of the first switchable converter and the second switchable converter at the machine side and the network side;
calculating a rotation duty ratio for equalizing the first shell temperature and the second shell temperature according to the shell temperature difference and the loss power difference, including:
by using
Figure FDA0002798490120000011
Obtaining D';
according to
Figure FDA0002798490120000012
D is obtained;
wherein D' is the adjusted duty ratio, Δ P is the power loss difference, K is the power conversion coefficient, and Δ TCFor the shell temperature difference, KP、KIAs a parameter of the PI regulator, DmaxIs the maximum amplitude of the duty cycle, DminAnd D is the minimum amplitude limit value of the duty ratio, and D is the alternating duty ratio.
2. The soaking control method of the wind power converter according to claim 1, wherein the obtaining of the on-off control signals of the two switch groups in the grid conversion assembly by using the conversion duty ratio comprises:
and setting the rotation periods of the first switchable converter and the second switchable converter at the machine side and the network side as T, and comparing the rotation duty ratio D with the triangular carrier wave with the period of T to obtain on-off control signals of each switch group.
3. The wind power converter soaking control method according to claim 1, wherein the obtaining of the first shell temperature of the first IGBT module in the first switchable converter and the second shell temperature of the second IGBT module in the second switchable converter comprises:
obtaining the first shell temperature by using the resistance value of an NTC thermistor in the first IGBT module;
and obtaining the second shell temperature by using the resistance value of the NTC thermistor in the second IGBT module.
4. The soaking control method of the wind power converter according to claim 1, wherein the obtaining of the machine side total loss power and the grid side total loss power of the wind power converter comprises:
obtaining the current effective value I of the machine side of the wind power converterMNet side effective value of current IG；
Using said current effective value IMPerforming table lookup to obtain the heat loss power P of the IGBT contained in the IGBT module in the switchable converter at the machine sideIGBT_MAnd the heat loss power P of the diodeD_MThrough PM＝PIGBT_M+PD_MGet total power loss P of machine sideM；
Using said current effective value IGPerforming table lookup to obtain the heat loss power P of the IGBT contained in the IGBT module in the switchable converter positioned on the network sideIGBT_GAnd the heat loss power P of the diodeD_GThrough PG＝PIGBT_G+PD_GObtaining the total loss power P of the network sideG。
5. The soaking control method of the wind power converter according to claim 1, wherein the switches in the first switch group and the switches in the second switch group are reverse resistance GTO or IGCT which are reversely connected in parallel.
6. A soaking control device of a wind power converter is characterized by comprising:
the first obtaining module is used for obtaining a first shell temperature of a first IGBT module in a first switchable converter and a second shell temperature of a second IGBT module in a second switchable converter, and obtaining a shell temperature difference by utilizing the first shell temperature and the second shell temperature;
the second obtaining module is used for obtaining the machine side total loss power of the first IGBT module and the network side total loss power of the second IGBT module, and obtaining a loss power difference by using the machine side total loss power and the network side total loss power;
the calculation module is used for calculating a rotation duty ratio which enables the first shell temperature to be equal to the second shell temperature according to the shell temperature difference and the loss power difference;
the on-off control signal setting module is used for obtaining on-off control signals of two switch groups in the machine network switching assembly by utilizing the switching duty ratio; the on-off control signal of a first switch group is opposite to the on-off control signal of a second switch group, the first switch group comprises a first sub-switch group connected with the first switchable converter and the wind driven generator and a second sub-switch group connected with the second switchable converter and the power grid, and the second switch group comprises a third sub-switch group connected with the first switchable converter and the power grid and a fourth sub-switch group connected with the second switchable converter and the wind driven generator;
the control module is used for controlling the corresponding switch group according to the on-off control signal when the paired phase pulses of the machine side and the network side are in the same phase so as to realize seamless rotation of the first switchable converter and the second switchable converter on the machine side and the network side;
the calculation module comprises:
a first computing unit for utilizing
Figure FDA0002798490120000031
Obtaining D';
a second calculation unit for calculating based on
Figure FDA0002798490120000032
D is obtained;
wherein D' is the adjusted duty ratio, Δ P is the power loss difference, K is the power conversion coefficient, and Δ TCFor the shell temperature difference, KP、KIAs a parameter of the PI regulator, DmaxIs the maximum amplitude of the duty cycle, DminAnd D is the minimum amplitude limit value of the duty ratio, and D is the alternating duty ratio.
7. The soaking control system of the wind power converter is characterized by comprising the wind power converter and a controller connected with the wind power converter, wherein:
the wind power converter comprises a first switchable converter, a second switchable converter, a middle direct current unit connected with the first switchable converter and the second switchable converter, a machine network switching assembly, a first switch group and a second switch group, wherein the first switch group and the second switch group are arranged in the machine network switching assembly; the first switch group comprises a first sub switch group connected with the first switchable converter and the wind driven generator, and a second sub switch group connected with the second switchable converter and the power grid; the second switch group comprises a third sub switch group connected with the first switchable converter and the power grid and a fourth sub switch group connected with the second switchable converter and the wind driven generator;
the controller is used for executing the steps of the wind power converter soaking control method according to any one of claims 1 to 5.
8. A soaking control device of a wind power converter is characterized by comprising:
a memory for storing a computer program;
a processor for implementing the steps of the wind power converter soaking control method according to any one of claims 1 to 5 when storing said computer program.
9. A computer-readable storage medium, characterized in that a computer program is stored thereon, which, when being executed by a processor, carries out the steps of the wind power converter soaking control method according to any one of claims 1 to 5.
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