CN108258716A - The parameter determination method and device of current transformer braking resistor - Google Patents

The parameter determination method and device of current transformer braking resistor Download PDF

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Publication number
CN108258716A
CN108258716A CN201611239446.5A CN201611239446A CN108258716A CN 108258716 A CN108258716 A CN 108258716A CN 201611239446 A CN201611239446 A CN 201611239446A CN 108258716 A CN108258716 A CN 108258716A
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China
Prior art keywords
value
current transformer
low voltage
braking resistor
generating set
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Chinese (zh)
Inventor
高瑞
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Priority to CN201611239446.5A priority Critical patent/CN108258716A/en
Publication of CN108258716A publication Critical patent/CN108258716A/en
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    • H02J3/386—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The present invention provides a kind of parameter determination method and device of current transformer braking resistor, wherein, this method includes：Obtain running parameter of the wind power generating set during low voltage crossing；According to running parameter of the wind power generating set during low voltage crossing, the low voltage crossing time is determined；According to the low voltage crossing time, the capacity of the current transformer braking resistor of wind power generating set is determined.The problem of selecting the braking resistor for the current transformer for being appropriate to current wind generating set, and then preventing from not conforming to the making resistance institute pervious converter overvoltage suitable for the current transformer of current wind generating set, prevents device failure caused by braking resistor excess temperature；Due to having selected the braking resistor for the current transformer for being suitable for current wind generating set, braking resistor is released energy in time, and then when ensureing voltage failure, wind power generating set stable operation, wind power generating set timely solves low voltage failure of electric network, and reduces the failure rate of wind power generating set.

Description

The parameter determination method and device of current transformer braking resistor
Technical field
The present invention relates to technical field of wind power generation more particularly to a kind of parameter determination methods of current transformer braking resistor And device.
Background technology
Wind power generating set is acquisition wind energy, converts wind energy into the important tool of electric energy.The unsteady flow of wind power generating set Braking resistor in device is an important component.
In the prior art, in low voltage failure of electric network, the energy of DC capacitor storage cannot be fed to grid side in time, It needs to open brake unit at this time, then consumes excess energy in braking resistor；If the Capacity Selection of braking resistor It is unreasonable, can lead to braking resistor excess temperature or braking resistor cannot release in time energy the problem of, and then wind-force is caused to be sent out Motor group can not timely solve low voltage failure of electric network.
However in the prior art, how the capacity of braking resistor is reasonably selected, and then selects and be appropriate to wind-force hair The braking resistor of motor group is a urgent problem to be solved.
Invention content
The present invention provides a kind of parameter determination method and device of current transformer braking resistor, to solve in the prior art The problem of how reasonably selecting the capacity of braking resistor, and then selecting the braking resistor for being appropriate to wind power generating set.
It is an aspect of the present invention to provide a kind of parameter determination method of current transformer braking resistor, including：
Obtain running parameter of the wind power generating set during low voltage crossing；
According to running parameter of the wind power generating set during low voltage crossing, the low voltage crossing time is determined；
According to the low voltage crossing time, the capacity of the current transformer braking resistor of wind power generating set is determined.
Another aspect of the present invention is to provide a kind of parameter determining device of current transformer braking resistor, including：
First acquisition module, for obtaining running parameter of the wind power generating set during low voltage crossing；
Time determining module for the running parameter according to wind power generating set during low voltage crossing, determines low The voltage ride-through time；
Capacity determining module, for according to the low voltage crossing time, determining the current transformer system of wind power generating set The capacity of dynamic resistance.
The solution have the advantages that：By obtaining running parameter of the wind power generating set during low voltage crossing； According to running parameter of the wind power generating set during low voltage crossing, the low voltage crossing time is determined；It is worn according to low-voltage The more time determines the capacity of the current transformer braking resistor of wind power generating set.So as to reasonably select braking resistor Capacity, select the braking resistor for the current transformer for being appropriate to current wind generating set, and then prevent from not conforming to suitable for current wind The problem of making resistance institute pervious converter overvoltage of the current transformer of power generator group, further, prevent braking resistor mistake Device failure caused by temperature；Due to having selected the braking resistor for the current transformer for being suitable for current wind generating set, so that Braking resistor can release energy in time, and then when ensureing voltage failure, wind power generating set stable operation, wind power generating set Low voltage failure of electric network is timely solved, and reduces the failure rate of wind power generating set.
Description of the drawings
Fig. 1 is the flow chart of the parameter determination method of current transformer braking resistor that the embodiment of the present invention one provides；
Fig. 2 is the flow chart of the parameter determination method of current transformer braking resistor provided by Embodiment 2 of the present invention；
Fig. 3 is the structure diagram of the parameter determining device of current transformer braking resistor that the embodiment of the present invention three provides；
Fig. 4 is the structure diagram of the parameter determining device of current transformer braking resistor that the embodiment of the present invention four provides.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art All other embodiments obtained without making creative work shall fall within the protection scope of the present invention.
The flow chart of the parameter determination method of current transformer braking resistor that Fig. 1 is provided for the embodiment of the present invention one, such as Fig. 1 It is shown, the method for the present embodiment, including：
Step 101 obtains running parameter of the wind power generating set during low voltage crossing.
In the present embodiment, specifically, the executive agent of the present embodiment can be wind power generating set main control unit or Person is controller being connect with wind power generating set etc., and but not limited thereto.
When low voltage crossing occurs for wind power generating set, go to obtain wind power generating set in low voltage crossing process In running parameter, wherein, the running parameter got can be wind power generating set falling during low voltage crossing The voltage value perunit value or other voltage values or current value at moment.
Step 102, the running parameter according to wind power generating set during low voltage crossing, when determining low voltage crossing Between.
In the present embodiment, specifically, can according to running parameter of the wind power generating set during low voltage crossing, According to low voltage crossing national standard curve, go to calculate the low voltage crossing time；Alternatively, it is worn according to wind power generating set in low-voltage Running parameter during more, using the correspondence of pre-set running parameter and low voltage crossing time, inquire with The low voltage crossing time corresponding to current running parameter；The calculation of the calculating low voltage crossing time of this implementation is unlimited Due to this.
Step 103, according to the low voltage crossing time, determine the capacity of the current transformer braking resistor of wind power generating set.
In the present embodiment, specifically, according to the low voltage crossing time determined, pre-set low electricity may be used The correspondence between crossing time and the capacity of current transformer braking resistor is pressed, inquires the appearance of current transformer braking resistor Amount, and then determine the braking resistor of the current transformer suitable for current wind power generating set.
The present embodiment is by obtaining running parameter of the wind power generating set during low voltage crossing；According to wind-power electricity generation Running parameter of the unit during low voltage crossing, determines the low voltage crossing time；According to the low voltage crossing time, wind is determined The capacity of the current transformer braking resistor of power generator group.So as to reasonably select the capacity of braking resistor, select It is appropriate to the braking resistor of the current transformer of current wind generating set, and then prevents from not conforming to the change suitable for current wind generating set The problem of flowing the making resistance institute pervious converter overvoltage of device, further, device caused by preventing braking resistor excess temperature damages It is bad；Due to having selected the braking resistor for the current transformer for being suitable for current wind generating set so that braking resistor can and When release energy, and then when ensureing voltage failure, wind power generating set stable operation, wind power generating set timely solves power grid Low voltage failure, and reduce the failure rate of wind power generating set.
Fig. 2 is the flow chart of the parameter determination method of current transformer braking resistor provided by Embodiment 2 of the present invention, in reality On the basis of applying example one, as shown in Fig. 2, in the method for the present embodiment, step 102, specifically include：
According to the voltage value perunit value that falls moment of the wind power generating set during low voltage crossing, low-voltage is determined Crossing time.
Wherein, according to voltage value perunit value, the low voltage crossing time is determined, including：
According to low voltage crossing reactive current response curve, determine between voltage value perunit value and low voltage crossing time Second function relationship is：T=1.96x+0.2328, wherein, x is voltage value perunit value, and T is the low voltage crossing time；
According to voltage value perunit value and second function relationship, the low voltage crossing time is determined.
In the present embodiment, specifically, in a step 101, the parameter value at this time of wind power generating set is obtained, according to ginseng Numerical value determines whether wind power generating set enters low voltage crossing, for example, obtain the current transformer grid side of wind power generating set Phase voltage virtual value or other parameter value, go to judge wind power generating set according to phase voltage virtual value or other parameter value Whether low voltage crossing is entered, after current parameter value is compared with predetermined threshold value, it is possible to judge wind-driven generator Whether group enters low voltage crossing.When determining that wind power generating set enters low voltage crossing, go to obtain wind-force hair The voltage value perunit value that falls moment of the motor group during low voltage crossing.
It can be determined according to the voltage value perunit value that falls moment of the wind power generating set during low voltage crossing Go out the low voltage crossing time.Specifically, first, it is rung according to low voltage crossing national standard curve or low voltage crossing reactive current Curve is answered, it is T=1.96x+ first to determine the second function relationship between voltage value perunit value x and low voltage crossing time T 0.2328, wherein, the value range of x is 0<x<0.9；Then, will be in wind power generating set during low voltage crossing, it ought Before the voltage value perunit value x for falling the moment of the wind power generating set that gets during low voltage crossing, be updated to second Functional relation is in T=1.96x+0.2328, it is possible to obtain current low voltage crossing time T.It is found that different voltage value Perunit value x is updated to second function relationship in T=1.96x+0.2328, to obtain different low voltage crossing time T.
Step 103, including：
Step 1031, according to voltage value perunit value, determine reactive current perunit value.
Wherein, the specific implementation of step 1031 is：
According to low voltage crossing reactive current response curve, determine between voltage value perunit value and reactive current perunit value One functional relation isWherein, x is voltage value perunit value, and Ir is reactive current perunit value；
According to voltage value perunit value and first function relationship, reactive current perunit value is determined.
In the present embodiment, specifically, running parameter is the voltage value perunit value for falling the moment, so as to get wind-force Generating set is after the voltage value perunit value at moment is fallen, it is possible to according to wind power generating set in the voltage value for falling the moment Perunit value determines reactive current perunit value.Specifically, first, it according to low voltage crossing reactive current response curve, draws Go out first function relationship of the wind power generating set between the voltage value perunit value x and reactive current perunit value Ir for falling the moment, The first function relationship isThen, the wind power generating set currently got is when falling The voltage value perunit value x at quarter, is updated to the first function relationshipIn, and then calculate and work as Preceding reactive current perunit value Ir, it is known that different voltage value perunit value x can obtain different reactive current perunit value Ir.
Step 1032, according to reactive current perunit value and low voltage crossing time, determine the current transformer of wind power generating set With the capacity of braking resistor.
Preferably, the specific implementation of step 1032 is：
According to reactive current perunit value and low voltage crossing time, range of capacity is determined；
Maximum value in range of capacity is multiplied by and obtains reference value with reference to coefficient, is more than or equal to 1 with reference to coefficient；
Determine that the minimum value of the capacity of current transformer braking resistor is more than or equal to reference value.
Wherein, range of capacity is Alternatively,
Wherein, PnFor current transformer rated active power, ImaxMaximum operating currenbt perunit value for net side inverter.
In the present embodiment, specifically, can be determined according to reactive current perunit value Ir and low voltage crossing time T Go out the capacity of current transformer braking resistor.
Specifically, can unsteady flow be calculated according to low voltage crossing time T and reactive current perunit value Ir first Device range of capacity based on braking resistor isWherein, PnHave for current transformer is specified Work(power, ImaxMaximum operating currenbt perunit value for net side inverter, it is preferred that ImaxCan at this time it hold using value as 1.4343 Amount may range fromAlso, at this timeGeneration The energy range of the absorption energy of table current transformer braking resistor.
Then, since the functional relation of low voltage crossing time T and voltage value perunit value x second is T=1.96x+ 0.2328 and, the first function relationship between voltage value perunit value x and reactive current perunit value Ir isAnd then by low voltage crossing time T=1.96x+0.2328 and reactive current perunit valueIt is brought intoIn, the capacity model can be derived by Enclose forWork as ImaxWhen value is 1.4343, Range of capacity, which can be derived by, is And at this timeThe current transformer system of representing The range of the temporary impact energy of the absorption of dynamic resistance.
Then, according to formula Remove to determine the maximum value EE in range of capacity；Then the maximum value EE in range of capacity is multiplied by one with reference to coefficient h, it can be with A reference value C=EE*h is obtained, wherein, it needs to be more than or equal to 1 with reference to the value of coefficient h；And then using obtained reference value C as The minimum value of the capacity of current transformer braking resistor determines the minimum value of the capacity of current transformer braking resistor, needs to be more than Equal to reference value C, the capacity of braking resistor can be then determined.At this point, the instantaneous punching that current transformer braking resistor absorbs The extreme value for hitting energy is multiplied by this with reference to coefficient h for the maximum capacity of current transformer braking resistor.
After step 103, further include：
Step 201 obtains the resistance upper limit value of current transformer braking resistor and lower resistance limit value.
Wherein, the specific implementation of step 201 is：
The rated power of capacitance maximum working voltage and current transformer in current transformer, determines current transformer braking resistor Resistance upper limit value；
The drain charge voltage of braking power module in current transformer and the peak inrush current of braking power module determine The resistance value lower limiting value of current transformer braking resistor.
In the present embodiment, specifically, needing to get the resistance upper limit value and current transformer of current transformer braking resistor With the lower resistance limit value of braking resistor.
Can current transformer system be determined according to capacitance maximum working voltage, the rated power of current transformer in current transformer First resistance value of dynamic resistance, first resistance value are the resistance upper limit value R of current transformer braking resistor1.Specifically, according to unsteady flow The capacitance maximum working voltage of capacitance in device, the rated power of current transformer, determine current transformer resistance upper limit valueWherein, U1For the capacitance maximum working voltage of capacitance, P is the rated power of current transformer.For example, with 1.5MW's For the braking resistor of Switch current transformers, during 1.5MW current transformer Operation at full power, if Voltage Drop occurs at this time, in whole The maximum power consumed in braking resistor is 1500KW；At this point, U1For 1100V, P 1500KW.In U1It is for 1100V, P When 1500KW, according to resistance upper limit valueThe resistance value that current transformer braking resistor after parallel connection can be calculated is R1= 0.807 Ω, when selecting braking resistor, the resistance value of braking resistor should be less than this resistance upper limit value.
Can according to the drain charge voltage of the braking power module in current transformer, the peak inrush current of braking power module, Determine the second resistance value of current transformer braking resistor, which is the resistance value lower limiting value R of current transformer braking resistor2。 Specifically, the second resistance value of current transformer braking resistorWherein, U2For the drain charge voltage of braking power module, I Peak inrush current for braking power module.
Step 202, the maximum temperature drift Coefficient m according to preset current transformer braking resistor respectively brake current transformer The resistance upper limit value R of resistance1, lower resistance limit value R2Correction of temperature drift is carried out, determines the first actual resistance of current transformer braking resistor R1'=R1/ m, the second actual resistance R2'=R2/m。
In the present embodiment, specifically, maximum temperature drift Coefficient m in view of current transformer braking resistor, needs to calculating The resistance upper limit value R of the current transformer braking resistor gone out1With lower resistance limit value R2Correction of temperature drift is carried out, it can be by resistance upper limit value R1Divided by maximum temperature drift Coefficient m obtains the first actual resistance R of current transformer braking resistor at normal temperatures1'=R1/ m can be incited somebody to action Lower resistance limit value R2Divided by maximum temperature drift Coefficient m obtains the second actual resistance R of current transformer braking resistor at normal temperatures2'= R2/m。
Step 203 determines that the resistance value of current transformer braking resistor is more than the second actual resistance and less than the first actual resistance.
In the present embodiment, specifically, the first actual resistance R according to braking resistor1' and the second actual resistance R2', really The resistance value R for making braking resistor is R2′<R<R1′。
The present embodiment is by obtaining running parameter of the wind power generating set during low voltage crossing；According to wind-power electricity generation Running parameter of the unit during low voltage crossing, determines the low voltage crossing time；According to the low voltage crossing time, determine to become Flow the capacity of device braking resistor；The resistance upper limit value of current transformer braking resistor and lower resistance limit value are obtained, according to preset The maximum temperature drift coefficient of current transformer braking resistor, respectively to the resistance upper limit value of current transformer braking resistor, lower resistance limit value Correction of temperature drift is carried out, determines the first actual resistance, the second actual resistance of current transformer braking resistor, determines that current transformer is braked The resistance value of resistance is more than the second actual resistance and less than the first actual resistance.So as to reasonably select the appearance of braking resistor Amount, selects the braking resistor for the current transformer for being appropriate to current wind generating set, and then prevents from not conforming to and be sent out suitable for current wind The problem of making resistance institute pervious converter overvoltage of the current transformer of motor group, further, prevent braking resistor excess temperature from leading The device failure of cause；Due to having selected the braking resistor for the current transformer for being suitable for current wind generating set, so that braking Resistance can release energy in time, and then when ensureing voltage failure, wind power generating set stable operation, and wind power generating set is timely Solution low voltage failure of electric network, and reduce wind power generating set failure rate.
Fig. 3 is the structure diagram of the parameter determining device of current transformer braking resistor that the embodiment of the present invention three provides, As shown in figure 3, device provided in this embodiment, including：
First acquisition module 31, for obtaining running parameter of the wind power generating set during low voltage crossing；
Time determining module 32 for the running parameter according to wind power generating set during low voltage crossing, determines The low voltage crossing time；
Capacity determining module 33, for according to the low voltage crossing time, determining the current transformer braking of wind power generating set The capacity of resistance.
The parameter determining device of the current transformer of the present embodiment braking resistor can perform the change of the offer of the embodiment of the present invention one The parameter determination method of device braking resistor is flowed, realization principle is similar, and details are not described herein again.
The present embodiment is by obtaining running parameter of the wind power generating set during low voltage crossing；According to wind-power electricity generation Running parameter of the unit during low voltage crossing, determines the low voltage crossing time；According to the low voltage crossing time, wind is determined The capacity of the current transformer braking resistor of power generator group.So as to reasonably select the capacity of braking resistor, select It is appropriate to the braking resistor of the current transformer of current wind generating set, and then prevents from not conforming to the change suitable for current wind generating set The problem of flowing the making resistance institute pervious converter overvoltage of device, further, device caused by preventing braking resistor excess temperature damages It is bad；Due to having selected the braking resistor for the current transformer for being suitable for current wind generating set so that braking resistor can and When release energy, and then when ensureing voltage failure, wind power generating set stable operation, wind power generating set timely solves power grid Low voltage failure, and reduce the failure rate of wind power generating set.
Fig. 4 is the structure diagram of the parameter determining device of current transformer braking resistor that the embodiment of the present invention four provides, On the basis of embodiment three, as shown in figure 4, device provided in this embodiment, time determining module 32, are specifically used for：
According to the voltage value perunit value that falls moment of the wind power generating set during low voltage crossing, low-voltage is determined Crossing time.
Wherein, time determining module 32, is specifically used for：According to low voltage crossing reactive current response curve, voltage is determined Second function relationship between value perunit value and low voltage crossing time is：T=1.96x+0.2328, wherein, x is voltage value mark One value, T are the low voltage crossing time；According to voltage value perunit value and second function relationship, the low voltage crossing time is determined.
Capacity determining module 33, including：
Electric current determination sub-module 331, for according to voltage value perunit value, determining reactive current perunit value；
Capacity determination sub-module 332, for according to reactive current perunit value and low voltage crossing time, determining braking resistor Capacity.
Wherein, electric current determination sub-module 331, is specifically used for：
According to low voltage crossing reactive current response curve, determine between voltage value perunit value and reactive current perunit value First isWherein, x is voltage value perunit value, and Ir is reactive current perunit value；
According to voltage value perunit value and first function relationship, reactive current perunit value is determined.
Capacity determination sub-module 332, is specifically used for：
According to reactive current perunit value and low voltage crossing time, range of capacity is determined；
Maximum value in range of capacity is multiplied by and obtains reference value with reference to coefficient, is more than or equal to 1 with reference to coefficient；
Determine that the minimum value of the capacity of current transformer braking resistor is more than or equal to reference value.
Wherein, range of capacity is Alternatively,
Wherein, PnFor current transformer rated active power, ImaxMaximum operating currenbt perunit value for net side inverter.
Device provided in this embodiment, further includes：
Second acquisition module 41, connect with capacity determining module 33, for obtaining the resistance of current transformer braking resistor Limit value, lower resistance limit value；
Correcting module 42, for the maximum temperature drift Coefficient m according to preset current transformer braking resistor, respectively to current transformer With the resistance upper limit value R of braking resistor1, lower resistance limit value R2Correction of temperature drift is carried out, determines that the first of current transformer braking resistor is real Border resistance value R1'=R1/ m, the second actual resistance R2'=R2/m；
Resistance value determining module 43, for being more than the second actual resistance and less than the according to the resistance value of current transformer braking resistor One actual resistance.
Second acquisition module 41, is specifically used for：
The rated power of capacitance maximum working voltage and current transformer in current transformer, determines current transformer braking resistor Resistance upper limit value；
The drain charge voltage of braking power module in current transformer and the peak inrush current of braking power module determine The resistance value lower limiting value of current transformer braking resistor.
The parameter determining device of the current transformer of the present embodiment braking resistor can perform the change of the offer of the embodiment of the present invention one The parameter determination method of device braking resistor is flowed, realization principle is similar, and details are not described herein again.
The present embodiment is by obtaining running parameter of the wind power generating set during low voltage crossing；According to wind-power electricity generation Running parameter of the unit during low voltage crossing, determines the low voltage crossing time；According to the low voltage crossing time, determine to become Flow the capacity of device braking resistor；The resistance upper limit value of current transformer braking resistor and lower resistance limit value are obtained, according to preset The maximum temperature drift coefficient of current transformer braking resistor, respectively to the resistance upper limit value of current transformer braking resistor, lower resistance limit value Correction of temperature drift is carried out, determines the first actual resistance, the second actual resistance of current transformer braking resistor, determines that current transformer is braked The resistance value of resistance is more than the second actual resistance and less than the first actual resistance.So as to reasonably select the appearance of braking resistor Amount, selects the braking resistor for the current transformer for being appropriate to current wind generating set, and then prevents from not conforming to and be sent out suitable for current wind The problem of making resistance institute pervious converter overvoltage of the current transformer of motor group, further, prevent braking resistor excess temperature from leading The device failure of cause；Due to having selected the braking resistor for the current transformer for being suitable for current wind generating set, so that braking Resistance can release energy in time, and then when ensureing voltage failure, wind power generating set stable operation, and wind power generating set is timely Solution low voltage failure of electric network, and reduce wind power generating set failure rate.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above-mentioned each method embodiment can lead to The relevant hardware of program instruction is crossed to complete.Aforementioned program can be stored in a computer read/write memory medium.The journey Sequence when being executed, performs the step of including above-mentioned each method embodiment；And aforementioned storage medium includes：ROM, RAM, magnetic disc or The various media that can store program code such as person's CD.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used To modify to the technical solution recorded in foregoing embodiments or carry out equivalent replacement to which part technical characteristic； And these modification or replace, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (13)

1. a kind of parameter determination method of current transformer braking resistor, which is characterized in that including：
Obtain running parameter of the wind power generating set during low voltage crossing；
According to running parameter of the wind power generating set during low voltage crossing, the low voltage crossing time is determined；
According to the low voltage crossing time, the capacity of the current transformer braking resistor of wind power generating set is determined.
2. according to the method described in claim 1, it is characterized in that, it is described according to wind power generating set in low voltage crossing process In running parameter, determine the low voltage crossing time, including：
According to the voltage value perunit value that falls moment of the wind power generating set during low voltage crossing, low voltage crossing is determined Time.
3. according to the method described in claim 2, it is characterized in that, described according to the low voltage crossing time, wind-force is determined The capacity of the current transformer braking resistor of generating set, including：
According to the voltage value perunit value, reactive current perunit value is determined；
According to the reactive current perunit value and the low voltage crossing time, the current transformer braking of wind power generating set is determined The capacity of resistance.
4. according to the method described in claim 3, it is characterized in that, described according to the voltage value perunit value, idle electricity is determined Perunit value is flowed, including：
According to low voltage crossing reactive current response curve, first between voltage value perunit value and reactive current perunit value is determined Functional relation isWherein, x is the voltage value perunit value, and Ir is the reactive current mark One value；
According to the voltage value perunit value and the first function relationship, the reactive current perunit value is determined；
Or/also,
According to the voltage value perunit value, the low voltage crossing time is determined, including：
According to low voltage crossing reactive current response curve, second between voltage value perunit value and low voltage crossing time is determined Functional relation is：T=1.96x+0.2328, wherein, x is the voltage value perunit value, and T is the low voltage crossing time；
According to the voltage value perunit value and second function relationship, the low voltage crossing time is determined.
It is 5. according to the method described in claim 4, it is characterized in that, described according to the reactive current perunit value and the low electricity Crossing time is pressed, determines the capacity of the current transformer braking resistor of wind power generating set, including：
According to the reactive current perunit value and the low voltage crossing time, range of capacity is determined；
Maximum value in the range of capacity is multiplied by and obtains reference value with reference to coefficient, it is described to be more than or equal to 1 with reference to coefficient；
Determine that the minimum value of the capacity of the current transformer braking resistor is more than or equal to the reference value.
6. according to the method described in claim 5, it is characterized in that, the range of capacity isAlternatively,
Wherein, PnFor current transformer rated active power, ImaxMaximum operating currenbt perunit value for net side inverter.
7. according to claim 1-6 any one of them methods, which is characterized in that it is described according to the low voltage crossing when Between, after the capacity of current transformer braking resistor for determining wind power generating set, further include：
Obtain the resistance upper limit value of current transformer braking resistor and lower resistance limit value；
According to the maximum temperature drift Coefficient m of preset current transformer braking resistor, respectively on the resistance of current transformer braking resistor Limit value R1, lower resistance limit value R2Correction of temperature drift is carried out, determines the first actual resistance R of current transformer braking resistor1'=R1/ m, Two actual resistance R2'=R2/m；
Determine that the resistance value of current transformer braking resistor is more than second actual resistance and less than first actual resistance.
8. the method according to the description of claim 7 is characterized in that resistance upper limit value for obtaining current transformer braking resistor And lower resistance limit value, including：
The rated power of capacitance maximum working voltage and current transformer in current transformer determines the electricity of current transformer braking resistor Hinder upper limit value；
The drain charge voltage of braking power module in current transformer and the peak inrush current of braking power module, determine unsteady flow The resistance value lower limiting value of device braking resistor.
9. a kind of parameter determining device of current transformer braking resistor, which is characterized in that including：
First acquisition module, for obtaining running parameter of the wind power generating set during low voltage crossing；
Time determining module for the running parameter according to wind power generating set during low voltage crossing, determines low-voltage Crossing time；
Capacity determining module, for according to the low voltage crossing time, determining the current transformer braking electricity of wind power generating set The capacity of resistance.
10. device according to claim 9, which is characterized in that the time determining module is specifically used for：
According to the voltage value perunit value that falls moment of the wind power generating set during low voltage crossing, low voltage crossing is determined Time.
11. device according to claim 10, which is characterized in that the capacity determining module, including：
Electric current determination sub-module, for according to the voltage value perunit value, determining reactive current perunit value；
Capacity determination sub-module, for according to the reactive current perunit value and the low voltage crossing time, determining that wind-force is sent out The capacity of the current transformer braking resistor of motor group.
12. according to the devices described in claim 11, which is characterized in that the capacity determination sub-module includes：
Capacitance range determination subelement, for according to the reactive current perunit value and the low voltage crossing time, determining to hold Measure range；
Reference value computation subunit obtains reference value for being multiplied by the maximum value in the range of capacity with reference to coefficient, described It is more than or equal to 1 with reference to coefficient；
Capacity determination subelement, for determining that the minimum value of the capacity of the current transformer braking resistor is more than or equal to the reference Value.
13. according to claim 9-12 any one of them devices, which is characterized in that further include：
Second acquisition module is connect with the capacity determining module, and second acquisition module is braked for obtaining current transformer The resistance upper limit value of resistance and lower resistance limit value；
Correcting module for the maximum temperature drift Coefficient m according to preset current transformer braking resistor, is respectively braked current transformer The resistance upper limit value R of resistance1, lower resistance limit value R2Correction of temperature drift is carried out, determines the first actual resistance of current transformer braking resistor R1'=R1/ m, the second actual resistance R2'=R2/m；
Resistance value determining module, for determining that the resistance value of current transformer braking resistor is more than second actual resistance and less than described First actual resistance.
CN201611239446.5A 2016-12-28 2016-12-28 The parameter determination method and device of current transformer braking resistor Pending CN108258716A (en)

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Application publication date: 20180706