CN113161965B - Efficient direct-current ice melting device special for wind power circuit and parameter adaptation method thereof - Google Patents
Efficient direct-current ice melting device special for wind power circuit and parameter adaptation method thereof Download PDFInfo
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- CN113161965B CN113161965B CN202110257119.7A CN202110257119A CN113161965B CN 113161965 B CN113161965 B CN 113161965B CN 202110257119 A CN202110257119 A CN 202110257119A CN 113161965 B CN113161965 B CN 113161965B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
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- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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Abstract
The utility model relates to a special high-efficient direct current ice-melt device of wind power generation line and parameter adaptation method thereof, the device includes: the device comprises a non-gear shifting transformer, a diode 6 pulse wave ice melting rectifier, an ice melting switching knife switch and an ice melting measurement and control system; the alternating current input side of the non-shift transformer is connected to an alternating current power grid, the output side of the non-shift transformer is connected to the alternating current input side of the diode 6 pulse wave ice melting rectifier, the direct current output side of the diode 6 pulse wave ice melting rectifier is connected with one side of the ice melting switching disconnecting link, and the other side of the ice melting switching disconnecting link is connected to a wind power circuit to be melted; the ice melting measurement and control system detects the key state quantities of all components in the ice melting device, including voltage, current and temperature, and sends out protection alarm information when the key state quantities are abnormal. According to the technical scheme provided by the embodiment of the disclosure, the special efficient direct-current ice melting device for the wind power circuit can be realized, and efficient and economic ice melting and removing of the wind power circuit can be realized by combining a parameter adaptation (namely configuration) method of the device.
Description
Technical Field
The disclosure relates to the technical field of electricity, in particular to a special efficient direct-current deicing device for a wind power circuit and a parameter adaptation method thereof.
Background
Wind power plants are usually located in areas with rich wind power resources such as mountaintops, plateaus and valley mouths, output lines of the wind power plants often penetrate through a repeated icing area and are more prone to suffering from rain and snow freezing disasters than ordinary power transmission lines, and the lines are prone to falling down and breaking after being iced, so that normal output of wind power is affected. The severe icing of wind power lines almost occurs every year in winter, and the lines need to be de-iced on site. In view of the above situation, currently, ice-resisting verification of the outgoing lines is required before each wind farm is put into operation, and an ice melting device is required to be configured for the wind power outgoing lines passing through the severely icing area.
At present, wind power circuit melting and deicing generally utilize a general main network direct current melting and deicing device. The general direct current ice melting device is mainly designed aiming at the characteristics of a main network transmission line, the device capacity is large, and the voltage and the current need to be adjustable in a large range so as to adapt to the ice melting requirements of different line lengths and line types. The devices mainly include two types, one is a thyristor-based phase-controlled rectification type device, and the other is a non-controlled rectification type device based on a multi-gear transformer and a diode rectifier. Although the two types of ice melting devices can also melt and remove ice on the wind power circuit, the ice melting devices have obvious defects in technical indexes and economy when being used for the wind power circuit.
Because the wind power transmission line is a 110kV line with a small line diameter and a short distance, the ice melting current corresponding to the ice melting and removing of the ice-easily-covered section is generally not more than 1kA, the ice melting voltage is not more than 3kV, the ice melting output power is not more than 3MW, and the required ice melting device is generally connected to a 10kV or 35kV power grid. When the thyristor-type phase-controlled rectification type direct-current ice melting device is adopted, the ice melting system has poor economical efficiency and outstanding reactive harmonic problems due to the fact that the required output ice melting direct-current voltage is far lower than the alternating-current side voltage, the power factor is extremely low, the reactive power consumption is large, the harmonic pollution is serious, and the capacity of the whole set of ice melting device is far larger than the wind power ice melting power. When a multi-gear voltage-regulating type uncontrolled rectifier type ice melting device is adopted, in order to adapt to ice melting requirements under different conditions, a large regulating margin is reserved generally, so that the number of gears of a transformer is large, the capacity of the device is still large, the operation is complex due to the large number of gears, particularly, direct resistance needs to be measured again on site after gear regulation, and the field implementation is not facilitated.
The prior art provides an intensive direct-current deicing device for a wind power plant, which comprises a three-winding deicing transformer, series-parallel disconnecting links, two groups of dynamic reactive power compensation units and the like. The device has ice melting and SVG reactive power compensation functions. The device has a complex structure, and the required fully-controlled power component has large capacity (far larger than ice melting output power) and needs a multi-gear transformer for deep voltage regulation, so the device has high manufacturing cost and poor economy.
The method is only suitable for a silicon controlled rectifier system, and the controllable rectifier system can output any voltage and current which do not exceed the rated output voltage and current of the direct current ice melting device by regulating and controlling the conduction angle of the rectifier. However, this method cannot be applied to a commonly used diode uncontrolled rectifying system, because the diode rectifying system is not controllable, and the output ice melting parameter of the diode uncontrolled rectifying system depends only on external conditions.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the present disclosure provides a special efficient dc deicing device for a wind power line and a parameter adaptation method thereof.
The utility model provides a special direct current ice-melt device of wind-powered electricity generation circuit, the device includes: the device comprises a non-gear shifting transformer, a diode 6 pulse wave ice melting rectifier, an ice melting switching knife switch and an ice melting measurement and control system;
the alternating current input side of the no-gear-shifting transformer is connected to an alternating current power grid, the output side of the no-gear-shifting transformer is connected to the alternating current input side of the diode 6 pulse wave ice-melting rectifier, the direct current output side of the diode 6 pulse wave ice-melting rectifier is connected with one side of the ice-melting switching knife switch, and the other side of the ice-melting switching knife switch is connected to a wind power circuit to be melted with ice; the ice melting measurement and control system detects key state quantities of all components in the gear-shifting-free transformer, the diode rectifier and the ice melting switching knife switch and sends out protection alarm information when the key state quantities are abnormal; the key state quantities include voltage, current, and temperature.
Preferably, the rated output direct current of the direct current ice melting device is configured according to 85-95% of the maximum ice melting current corresponding to the type of the wire of the wind power circuit, and the rated output direct current voltage is configured according to the rated current output when two parallel strings of direct current of the wind power circuit melt ice.
Preferably, the ice melting switching knife switch is formed by combining 6 pairs of single-phase knife switches, wherein one end of each of the three pairs of single-phase knife switches is connected in parallel to the positive electrode of the direct current side of the 6-pulse rectifier, and the other end of each of the three pairs of single-phase knife switches is connected with the phase a line, the phase B line and the phase C line of the ice coating line (i.e., the line to be melted); and one ends of the three single-phase disconnecting links are connected to the negative pole of the direct-current side of the diode 6 pulse wave ice melting rectifier in parallel, and the other ends of the three single-phase disconnecting links are connected with the A-phase line, the B-phase line and the C-phase line of the ice coating line respectively. Under the structure, any one of the A-phase line, the B-phase line and the C-phase line supports two parallel-serial (or called two-loop-to-two-loop) and two-phase serial (or called one-loop-to-one-loop) direct-current ice melting modes, and flexible selection of the two ice melting modes can be realized.
Preferably, the direct-current side rated current I of the diode 6 pulse wave ice-melting rectifierNAnd DC side rated voltage UNRespectively connected with rated output direct current I of the ice melting deviceDCNAnd rated output DC voltage UDCNAre identical, i.e. IN＝IDCNRated output voltage UN＝UDCN；
Alternating-current side input current I of diode 6 pulse wave ice-melting rectifierACNAnd an AC side input voltage UACNBased on the rated current I of the DC side of the 6-pulse rectifierNDC side rated voltage UNAnd determination of AC/DC conversion coefficients, i.e.
IACN＝0.816IN，UACN＝UN/1.25；
The output current of the ice-melting switching switch is determined based on the change of the connection mode of the ice-melting switch;
under the condition that the ice melting switching knife switch adopts a two-in-one-serial connection mode, the output current is equal to the rated output current IDCN；
Under the condition that the ice melting switching knife switch adopts a two-phase series connection mode, the output current is equal to 0.75IDCN。
The present disclosure also provides a parameter adaptation method for a special efficient dc ice melting device for a wind power line, where the parameter adaptation method includes:
1) the method comprises the steps of obtaining line parameters of a wind power line to be subjected to ice melting and typical meteorological parameters (namely field meteorological parameters) during ice coating, wherein the line parameters comprise wire linear specifications, lengths and direct current resistances, and the field meteorological parameters mainly comprise typical environmental temperature and wind speed during ice coating.
2) Determining a maximum ice-melting current based on the line parameters and the on-site meteorological parameters; examples include: looking up the ice-melting related guide file (such as the ice-melting technical guide rule of the transmission line) to calculate the corresponding ice-melting current range, and determining the maximum ice-melting current I which can be borne by the ice-melting related guide filemaxNormal maximum ice-melting current ImaxThe maximum ice melting current under the general meteorological conditions (which can be the conditions of the ambient temperature of minus 5 ℃ and the wind speed of 5 m/s) is selected.
3) Determining the rated output direct current and rated output direct voltage of the whole ice melting device based on the maximum ice melting current and the line parameters; wherein
Rated output current I of ice melting deviceNSatisfies the following conditions: i isN＝kr×Imax；krRepresenting the ice melting current coefficient, and satisfying k being more than or equal to 0.85rLess than or equal to 0.95; wherein when k isrWhen k is 0.85, the ice melting speed is slow, and when k isrWhen the melting ice rate is 0.95, the melting ice speed is higher; between 0.85 and 0.95, with krThe value of (A) is gradually increased, and the ice melting speed is gradually accelerated;
rated output voltage U of direct-current ice melting deviceNSatisfies the following conditions: u shapeN＝1.5×Rp×IN；RpAnd representing the single-phase resistance of the wind power circuit to be melted.
4) And configuring rated parameters of the diode 6 pulse wave ice-melting rectifier based on the rated output direct current and rated output direct current voltage of the whole ice-melting device. The method comprises the following steps:
the DC side rated parameter of the diode 6 pulse wave ice-melting rectifier is the same as that of the complete ice-melting device, namely the rated output current I of the diode 6 pulse wave ice-melting rectifierDCN＝INRated output voltage UDCN＝UN；
The AC side input parameters of the diode 6-pulse-wave ice-melting rectifier are selected according to the AC-DC conversion coefficient of the 6-pulse-wave rectifier, namely the rated AC current IACN＝0.816INRated input voltage UACN＝UN/1.25。
5) And configuring rated parameters of the ice melting transformer (namely, the un-regulated transformer) based on the integral rated output direct current and rated output direct current voltage of the ice melting device, wherein the rated parameters comprise rated output voltage, current and rated capacity of the primary side and the secondary side. Can include the following steps:
the ice melting transformer is only provided with one gear, the secondary rated output voltage of the ice melting transformer is configured according to the DC rated voltage of the ice melting device which is 0.8 times of the DC rated voltage of the ice melting device, and the secondary rated current of the ice melting transformer is configured according to the DC rated current of the ice melting device which is 0.816 times of the DC rated voltage of the ice melting device, namely the secondary rated output voltage U of the ice melting transformer2N＝0.8×UDCNSecondary side rated output current I2N＝0.816×IDCNRated capacity PDCN＝1.13UDCN×IDCN；
Primary side rated voltage U of ice melting transformer1NAccording to the configuration of the rated power grid voltage of an access point of the ice melting device (generally 10kV or 35kV), the configuration of the rated capacity of a primary side which is equal to the ice coating capacity, and the rated input current of the primary side which is I1N＝I2N×U2N/U1N。
6) And configuring rated parameters of the ice melting switching disconnecting link based on the integral rated output direct current and rated output direct current voltage of the ice melting device. Can include the following steps:
and the rated voltage of the ice melting switching knife switch is configured according to the rated output direct current voltage of the ice melting device, and the rated current of the ice melting switching knife switch is configured according to the rated output direct current of the ice melting device.
When the ice melting device carries out on-site ice melting, one of two operation modes of one or two times of ice melting can be selected through the ice melting switch according to on-site meteorological conditions (determined based on-site meteorological parameters) to melt ice.
Optionally, when the ambient temperature is low or the wind speed is high, two phases of the three-phase conductor are connected in parallel and then connected in series with one phase through the ice-melting disconnecting switch to form a two-in-one series or a one-out-two-loop mode, so as to obtain a large ice-melting current, wherein the ice-melting current is equal to the rated output current I of the ice-melting deviceDCN(ii) a When the environmental temperature is low and the wind speed is low, a de-icing and de-icing mode with low de-icing current is selected, and the theoretical calculated value of the de-icing current is 0.75IDCN. Because the two ice melting currents do not exceed the ice melting current range of the wind power circuit, ice melting can be realized without damaging the circuit, and only the ice melting time length is different.
Compared with other direct-current ice melting devices, the special efficient direct-current ice melting device for the wind power circuit and the parameter adaptation method thereof provided by the embodiment of the disclosure have the following advantages:
1) simple structure, small capacity of the converter and low cost. The ice melting device only comprises four parts, namely a transformer (namely an ice melting transformer), a rectifier (namely a diode 6 pulse wave ice melting rectifier), a disconnecting link (namely an ice melting switching disconnecting link) and an ice melting measurement and control system, and is simple in structure. And the capacities of a transformer and a rectifier in the main components are equivalent to the direct-current ice melting power required by a wind power circuit, and the capacities of the transformers and the rectifiers are far smaller than those of a conventional universal movable ice melting device, so that the manufacturing cost of the complete set of ice melting device can be greatly reduced.
2) The ice melting device has simple regulation mode of rated output direct current (namely output current) and can adapt to different meteorological conditions. Although the ice melting device only has one transformer gear, two ice melting currents with different sizes and capable of realizing ice melting can be output through the ice melting switching knife switch, and the one current and the other current can respectively correspond to different meteorological conditions.
3) And the portability is strong. In the parameter adaptation method, each step has strict objective constraint conditions, and a designer is basically not required to select data artificially, so that the design result of the method does not have obvious difference due to different experiences or preferences of the designer.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an ice melting apparatus provided in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another ice melting device provided in the embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a parameter adaptation method according to an embodiment of the present disclosure.
The system comprises a 110-non-shifting transformer, a 120-diode 6-pulse wave ice melting rectifier, a 130-ice melting switching knife switch, a 140-ice melting measurement and control system, a 010-alternating current power grid and a 020-wind power circuit to be melted.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
The efficient dc de-icing apparatus dedicated to the wind power circuit and the parameter adaptation method thereof provided by the embodiment of the present disclosure are exemplarily described below with reference to fig. 1 and fig. 2.
Fig. 1 is a schematic structural diagram of an ice melting device according to an embodiment of the present disclosure. Referring to fig. 1, the efficient dc ice melting apparatus dedicated for wind power lines includes: a non-shifting transformer 110 (may be referred to as a transformer 110 for short), a diode 6 pulse wave ice melting rectifier 120 (may be referred to as a rectifier 120 or a diode rectifier 120 for short), an ice melting switching switch 130 (may be referred to as a switch 130 for short), and an ice melting measurement and control system 140; the alternating current input side of the non-shifting transformer 110 is connected to an alternating current power grid 010, the output side of the non-shifting transformer 110 is connected to the alternating current input side of the diode 6 pulse wave ice-melting rectifier 120, the direct current output side of the diode 6 pulse wave ice-melting rectifier 120 is connected with one side of the ice-melting switching knife switch 130, and the other side of the ice-melting switching knife switch 130 is connected to a wind power circuit 020 to be melted; the ice melting measurement and control system 140 detects the key state quantities of the main components in the transformer 110, the rectifier 120 and the disconnecting link 130 inside the ice melting device, and sends out protection alarm information when the key state quantities are abnormal.
The key state quantity may include, among other things, a temperature, such as an oil temperature of the transformer 110; may include voltage and current, such as input-output voltage current in each component; the on-off state of the knife switch (determining the connection mode) can also be included.
Rated output direct current voltage U of ice melting deviceDCNSecondary rated output voltage U of transformer without gear shifting2NRated output direct current I of ice melting deviceDCNRated output current I of secondary side of non-shifting transformer2NSatisfy U2N＝0.8×UDCN，I2N＝0.816×IDCN(ii) a And the rated output direct current of the ice melting device is configured according to 85-95% of the maximum ice melting current corresponding to the type of the wind power circuit conductor, namely IDCN＝kr×Imax；krRepresents a constant, and satisfies k of 0.85 ≦ kr≤0.95，ImaxRepresenting the maximum ice melting current of the wind power circuit to be melted; the rated output direct current voltage of the ice melting device is configured according to the output rated output direct current when two parallel-series direct currents of the wind power circuit melt ice, namely UDCN＝1.5×Rp×IDCN；RpRepresenting the single-phase resistance of the wind power line to be de-iced.
The ice melting device provided by the embodiment of the disclosure is a special efficient direct current ice melting device for a wind power circuit, and comprises a no-gear shifting transformer 110, a diode 6 pulse wave ice melting rectifier 120, an ice melting switching knife switch 130 and an ice melting measurement and control system 140. The alternating current input side of the non-shifting transformer 110 is connected to a 10kV or 35kV bus of the transformer substation, and the output side of the non-shifting transformer is connected to the alternating current input side of the diode 6 pulse wave ice melting rectifier 120; the direct current side of the diode 6 pulse wave ice-melting rectifier 120 is connected with the ice-melting switching switch 130, and is connected to a wind power circuit 020 to be melted by the ice-melting switching switch 130, also referred to as a circuit 020 to be melted for short, or the wind power circuit 020, or an ice-covered circuit 020; the ice melting measurement and control system 140 detects the state quantity of the main components in the ice melting device and sends out protection alarm information when the state quantity is abnormal. Therefore, the device is simple in structure, the capacity of the transformer and the rectifier can be matched with the capacity of the wind power circuit, and the cost is low. Meanwhile, the ice melting requirement is met, and meanwhile, the wind power circuit cannot be damaged.
In some embodiments, the ice melting switching switch 130 is formed by combining 6 pairs of single-phase switches, where one end of each of the three pairs of switches is connected in parallel to the dc side positive electrode of the 6-pulse rectifier, and the other end is connected to the a-phase line, the B-phase line, and the C-phase line of the ice-covered line (i.e., the line to be melted ice) respectively; and in addition, one ends of the three single-phase disconnecting switches are connected to the negative electrode of the direct-current side of the diode 6 pulse wave ice-melting rectifier in parallel, and the other ends of the three single-phase disconnecting switches are respectively connected with the A-phase line, the B-phase line and the C-phase line of the ice-coating line.
Therefore, the ice melting switching switch 130 is formed by combining 6 pairs of single-phase switches, one pair of switches are respectively arranged between the ac-side ABC three-phase and dc-side anodes and between the ac-side ACB three-phase and dc-side cathodes, so that any one phase of wire (i.e. line) among the a-phase, B-phase and C-phase supports a connection mode of two-in-one-string (or called one-to-two-loop) and two-phase series (or called one-to-one-loop), thereby realizing a corresponding dc ice melting mode and realizing flexible selection of two ice melting modes.
In some embodiments, other critical state quantities in the ice melting device may satisfy: direct-current side rated current I of diode 6-pulse-wave ice-melting rectifierNAnd DC side rated voltage UNRespectively connected with rated output direct current I of ice melting deviceDCNAnd rated output DC voltage UDCNSame, i.e. IN＝IDCNRated output voltage UN＝UDCN(ii) a Alternating-current side input current I of diode 6-pulse-wave ice-melting rectifierACNAnd an AC side input voltage UACNDC side rated current I based on 6 pulse wave rectifierNRated voltage U on DC sideNAnd determination of AC-DC conversion coefficients, i.e. IACN＝0.816IN，UACN＝UN1.25; the output current of the ice melting switching knife switch is determined based on the change of the connection mode of the ice melting knife switch; under the condition that the ice melting switching knife switch adopts a two-in-one-series connection mode, the output current is equal to the rated output current IDCN(ii) a Under the condition that the ice melting switching knife switch adopts a two-phase series connection mode, the output current is equal to 0.75IDCN。
In the ice melting device, the non-regulating transformer 110 is connected to the diode 6 pulse ice melting rectifier 120, and then connected to the line 020 to be melted with ice through the ice melting switching knife switch 130. The non-shifting transformer 110 is only provided with one shift, and the secondary rated output voltage of the non-shifting transformer is configured according to 0.8 time of the direct-current rated voltage (namely, the rated output voltage) of the ice melting device. Therefore, the ice melting device is simple in structure and small in transformer capacity, and can provide an ice melting scheme which is simple and reliable in structure, economical and excellent in performance for direct-current ice melting of the wind power circuit.
The combined mode of the ice melting output disconnecting link is adjusted according to on-site meteorological conditions during on-site ice melting, and ice is melted once by the ice melting switching disconnecting link when the wind speed is low and the environmental temperature is not very low; when the wind speed is higher, the ice is melted by adopting a one-time-in-one-time mode.
Therefore, two ice melting currents with different sizes and capable of realizing ice melting can be provided, and an ice melting scheme with simple and reliable structure, economy and excellent performance is realized.
On the basis of the above embodiment, the present disclosure further provides a parameter adaptation method for a special high-efficiency direct-current ice melting device for a wind power circuit, and the method is suitable for configuring the current and the voltage of any one of the ice melting devices.
Exemplarily, fig. 3 is a flowchart of a parameter adapting method provided in an embodiment of the present disclosure. Referring to fig. 3, the parameter adaptation method may include:
s210, obtaining line parameters of the wind power line to be de-iced and on-site meteorological data during the ice coating period.
The line parameters can include line type specification of the line, line length, resistance parameters and other parameters which influence the ice melting effect; the on-site meteorological data can comprise data which influence the ice melting effect, such as weather conditions, air temperature, wind speed and the like.
In the step, line parameters and field meteorological data are obtained, and basic data support is provided for subsequently determining the maximum ice melting current.
And S220, determining the maximum ice melting current based on the line parameters and the field meteorological data.
In the step, a corresponding ice melting current range is calculated by referring to ice melting related guide files (such as ice melting technical guide rules of the power transmission line), and the maximum ice melting current I which can be borne by the ice melting related guide files is determinedmaxUsually the maximum ice melting current ImaxThe maximum ice melting current under the general meteorological conditions (which can be the conditions of the ambient temperature of minus 5 ℃ and the wind speed of 5 m/s) is selected.
And S230, determining the rated output direct current and rated output direct current voltage of the whole ice melting device based on the maximum ice melting current and the line parameters.
Wherein, the rated output direct current of the ice melting device can be obtained by multiplying the maximum ice melting current by a coefficient; on the basis, the rated output direct current voltage of the wind power generation system can be determined by combining with the impedance parameter of the wind power generation system.
In some embodiments, this step may include:
by the use of IDCN＝kr×ImaxDetermination of the rated output current IDCN(ii) a Wherein k isrRepresents a constant, and satisfies k of 0.85 ≦ kr≤0.95，ImaxRepresenting the maximum ice-melting current of the wind power circuit to be ice-melted;
by UDCN＝1.5×Rp×IDCNDetermining the output voltage UDCN(ii) a Wherein R ispRepresenting the single-phase resistance of the wind power line to be de-iced.
Further, the method may further comprise:
and determining the primary side rated voltage, the primary side rated current, the primary side rated capacity, the secondary side rated output voltage, the secondary side rated output current and the secondary side rated capacity of the ice melting transformer, the rated parameters of the diode 6 pulse wave ice melting rectifier and the output current of the ice melting switching knife switch based on the rated output current and the rated output voltage. The method specifically comprises the following steps:
the ice melting transformer is only provided with one gear, the secondary rated output voltage is configured according to the DC rated voltage of the ice melting device which is 0.8 times of the DC rated voltage of the ice melting device, and the secondary rated current is configured according to the DC rated current of the ice melting device which is 0.816 times of the DC rated voltage of the ice melting device, namely the secondary rated output voltage U of the ice melting transformer2N＝0.8×UDCNSecondary side rated output current I2N＝0.816×IDCNSecondary rated capacity PDCN＝1.13UDCN×IDCN；
Primary side rated voltage U of ice-melting transformer1NAccording to the configuration of the rated power grid voltage of an access point of the ice melting device (generally 10kV or 35kV), the configuration of the rated capacity of a primary side which is equal to the ice coating capacity, and the rated input current of the primary side which is I1N＝I2N×U2N/U1N；
Based on that the rated parameter of the alternating current side is equal to the rated output voltage U of the secondary side of the non-gear shifting transformer2NRated output current I of secondary side2NThe rated parameter of the direct current side is equal to the rated output voltage U of the ice melting deviceDCNAnd rated output current IDCNDetermining rated parameters of a diode 6 pulse wave ice-melting rectifier;
when the ice melting switching knife switch adopts a two-in-one-series connection mode, the output current is equal to the rated output current IDCN(ii) a When the ice melting switching knife switch adopts a two-phase series connection mode, the output current is equal to 0.75IDCN。
Further, the method may further comprise:
determining the connection mode of the ice melting switching switch based on the on-site meteorological parameters, and determining the output current of the ice melting switching switch; wherein
At ambient temperature below a first preset temperature and/or at wind speed above a first windAt high speed, the ice melting switching knife switch adopts a two-in-one connection mode, and the output current is equal to the rated output current IDCN；
When the ambient temperature is higher than a second preset temperature and/or the wind speed is lower than a second wind speed, the ice melting switching disconnecting link adopts a two-phase series connection mode, and the output current is equal to 0.75IDCN；
The first preset temperature is equal to or lower than the second preset temperature, and the first wind speed is equal to or higher than the second wind speed.
Therefore, when the ice melting device carries out the on-site ice melting, one of two operation modes of one-time operation or two-time operation can be selected through the ice melting switching knife switch according to on-site meteorological conditions (determined based on-site meteorological parameters) to carry out the ice melting. When the environmental temperature is low or the wind speed is high, two phases in the three-phase lead are connected in parallel and then connected in series with the other phase through the ice melting disconnecting link to form a two-in-one or one-out-two-loop mode to obtain a large ice melting current, and the ice melting current is equal to the rated output current I of the ice melting deviceDCN(ii) a When the environmental temperature is lower and the wind speed is lower, a de-ice and de-ice mode with smaller de-ice current is selected, and the theoretical calculated value of the de-ice current is 0.75IDCN. Because the two ice melting currents do not exceed the ice melting current range of the wind power circuit, ice melting can be realized without damaging the circuit, and only the ice melting time length is different.
On the basis of the above embodiment, the parameter adaptation method of the ice melting device may include the following steps.
The method comprises the following steps: collecting line parameters of the wind power line to be melted and determining thread meteorological data.
Step two: according to the line type of the wind power circuit, looking up an ice-melting related guide file, such as the ice-melting technical guide rule of the power transmission line, so as to calculate the corresponding ice-melting current range; meanwhile, the application range [ I ] of the ice coating is determined after the typical meteorological conditions under the working condition of the local ice coating are consideredmin，Imax]。
And step three, determining the rated output current and the rated output voltage of the ice melting device.
Specifically, the rated output current of the ice melting device is according to IDCN＝kr×ImaxConfiguration of where krCan be selected from 0.85-0.95; the rated output voltage is configured according to the output of the rated current of the wind power circuit in a two-in-one-string ice melting mode, namely UDCN＝1.5×Rp×IDCN(ii) a Rated output power of ice melting according to PDCN＝IDCN×UDCNAnd (5) designing.
Step four: and configuring parameters of the transformer.
Specifically, the ice melting transformer is only provided with one gear, and the secondary rated output voltage of the ice melting transformer is configured according to 0.8 time of the DC rated voltage of the ice melting device, namely U2N＝0.8×UDCN(ii) a The rated output current of the secondary side is configured according to 0.816 times of the rated output current of the device, i.e. I2N＝0.816×IDCN(ii) a The primary side of the transformer is configured according to the rated voltage of a grid connection point; the primary side and the secondary side of the transformer have the capacity of 1.13UDCN×IDCNAnd (4) configuring.
Step five: parameters of the rectifier are configured.
Specifically, the ice melting rectifier (i.e. rectifier) adopts a 6-pulse rectification mode, and the rated parameter of the alternating current side of the ice melting rectifier is U2N、I2NThe output rated parameter of the direct current side is UDCN、IDCN。
Step six: and configuring parameters of the knife switch.
Specifically, the voltage and the current of the ice melting knife switch are according to the rated voltage and the current UDCN、IDCNAnd (4) configuring.
When the ice melting device melts ice on site, the ice melting switching switch is used for switching between a one-circuit ice melting mode and a two-circuit ice melting mode so as to meet the ice melting requirements under different meteorological conditions. Specifically, when the environmental temperature is low or the wind speed is high, a one-to-two-circuit connection mode with high ice-melting current is selected, and the theoretical calculated value of the ice-melting current is IDCN(ii) a When the environmental temperature is lower and the wind speed is lower, a one-to-one connection-back mode with smaller ice-melting current is selected, and the theoretical calculated value of the ice-melting current is 0.75IDCN. Under the two ice melting modes, the ice melting current (namely the rated output current of the ice melting device) can not exceed the windThe ice melting current range of the electric line can realize ice melting without damaging the line, and only the ice melting duration is different.
The following describes an exemplary parameter adaptation method provided by the embodiments of the present disclosure with reference to a specific wind power circuit example, which may include the following steps.
The method comprises the following steps: and collecting line parameters of a sending line of the wind power plant according to the field condition of the wind power plant. For example, LGJ-300/30 conductor is used, the total length of the line is 4.5km, and the single-phase resistance of the line is 0.423 omega.
Step two: the ice melting current range of the power transmission line under typical meteorological conditions can be determined by referring to GDW-2013 'technical guide for ice melting current of power transmission lines'; on the basis, the range of the ice melting current suitable for the ice melting can be determined to be [680A, 1100A ] by combining field meteorological data, for example, the lowest air temperature can reach-5 ℃ when ice is coated in winter, and the maximum wind speed along the line can reach 15m/s]. I.e. Imax＝1100A
Step three: and configuring rated output parameters of the ice melting device.
In combination with the above, rated output current IDCN＝kr×Imax＝0.9×1100A＝990A；
Rated output voltage UDCN＝1.5×Rp×IDCN＝1.5×0.423×990A＝628V；
Rated output power PDCN＝UDCN×IDCN＝628V×990A＝621kW。
Step four: and configuring rated parameters of the ice melting transformer.
In combination with the above, the secondary side thereof has a rated output voltage U2N＝0.8×UDCN＝0.8×628V＝502V；
Secondary side rated output current I2N＝0.816×IDCN＝0.816×990A＝808A；
The primary side of the transformer is configured according to the rated voltage of 10kV of a grid-connected point of the ice melting device; the primary and secondary capacities of the transformer are both 1.13U in KVADCN×IDCNThe configuration is 702kW for 1.13 multiplied by 621 kW.
Step five: and designing rated parameters of the ice melting rectifier.
The ice melting rectifier adopts a 6-pulse rectification mode, the rated voltage and current parameters of an alternating current side of the ice melting rectifier are 502V/808A, and the rated output parameters of a direct current side of the ice melting rectifier are 628V/990A/621 kW.
Step six: and configuring and outputting main parameters of the ice melting knife switch.
Wherein, the rated parameter 628V/990A of the ice melting knife switch.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. 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 disclosure. Thus, the present disclosure 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 (4)
1. A special efficient direct-current ice melting device for a wind power circuit is characterized by comprising a non-gear shifting transformer, a diode 6-pulse-wave ice melting rectifier, an ice melting switching knife switch and an ice melting measurement and control system;
the alternating current input side of the no-gear-shifting transformer is connected to an alternating current power grid, the output side of the no-gear-shifting transformer is connected to the alternating current input side of the diode 6 pulse wave ice-melting rectifier, the direct current output side of the diode 6 pulse wave ice-melting rectifier is connected with one side of the ice-melting switching knife switch, and the other side of the ice-melting switching knife switch is connected to a wind power circuit to be melted with ice;
the ice melting measurement and control system detects key state quantities in each component in the gear-shifting-free transformer, the diode rectifier and the ice melting switching knife switch and sends out protection alarm information when the key state quantities are abnormal;
the key state quantities include voltage, current and temperature;
wherein the voltage comprises a rated output direct current voltage U of the ice melting deviceDCNAnd the secondary rated output voltage U of the non-gear shifting transformer2NSaid current comprisingRated output direct current I of ice melting deviceDCNAnd the secondary rated output current I of the non-gear shifting transformer2NSatisfy U2N＝0.8×UDCN，I2N＝0.816×IDCN(ii) a And is provided with
The rated output direct current of the ice melting device is configured according to 85-95% of the maximum ice melting current corresponding to the type of the wire of the wind power circuit, namely IDCN＝kr×Imax；krRepresents a constant, and satisfies k of 0.85 ≦ kr≤0.95，ImaxRepresenting the maximum ice-melting current of the wind power circuit to be ice-melted;
the rated output direct current voltage of the ice melting device is configured according to the output rated output direct current when two direct currents in a wind power circuit are connected in series and in parallel during ice melting, namely UDCN＝1.5×Rp×IDCN；RpRepresenting the single-phase resistance of the wind power line to be melted;
the direct-current side rated current I of the diode 6 pulse wave ice-melting rectifierNAnd DC side rated voltage UNRespectively connected with rated output direct current I of the ice melting deviceDCNAnd rated output DC voltage UDCNSame, i.e. IN＝IDCNRated output voltage UN＝UDCN；
Alternating-current side input current I of diode 6 pulse wave ice-melting rectifierACNAnd an AC side input voltage UACNDirect-current side rated current I based on diode 6 pulse wave ice melting rectifier respectivelyNRated voltage U on DC sideNAnd determination of AC-DC conversion coefficients, i.e.
IACN＝0.816IN，UACN＝UN/1.25；
The output current of the ice melting switching switch is determined based on the change of the connection mode of the ice melting switching switch;
under the condition that the ice melting switching knife switch adopts a two-in-one-serial connection mode, the output current is equal to the rated output current IDCN；
Two-phase series connection is selected as the ice melting switching knife switchIn the case of the ground mode, the output current is equal to 0.75IDCN。
2. A parameter adaptation method of a special efficient direct current ice melting device for a wind power circuit is characterized by being suitable for configuring the current and the voltage of the ice melting device as claimed in claim 1; the parameter adaptation method comprises the following steps:
acquiring line parameters of a wind power line to be deiced and on-site meteorological parameters during icing;
determining a maximum ice-melting current I based on the line parameters and the on-site meteorological parametersmax；
Determining a rated output direct current I of the ice melting device based on the maximum ice melting current and the line parametersDCNAnd rated output DC voltage UDCNAnd determining the rated secondary output voltage U of the non-shifting transformer2NRated output current I of secondary side2NWherein
IDCN＝kr×Imax；
Wherein k isrRepresents a constant, and satisfies k of 0.85 ≦ kr≤0.95，ImaxRepresenting the maximum ice-melting current of the wind power circuit to be ice-melted;
UDCN＝1.5×Rp×IDCN；
wherein R ispRepresenting the single-phase resistance of the wind power circuit to be de-iced;
U2N＝0.8×UDCN，I2N＝0.816×IDCN。
3. the parameter adaptation method according to claim 2, further comprising:
rated output direct current I based on ice melting deviceDCNAnd rated output DC voltage UDCNDetermining the rated current I of the DC side of the diode 6 pulse wave ice-melting rectifierNDC side rated voltage UNAC side input current IACNAnd an AC side input voltage UACN(ii) a Wherein
IN＝IDCN，UN＝UDCN；
IACN＝0.816IN，UACN＝UN/1.25；
Further comprising:
the primary side rated capacity and the primary side rated voltage U of the non-gear shifting transformer are configured1NAnd primary side rated current I1N(ii) a Wherein
I1N＝I2N×U2N/U1N；
The rated capacity of the primary side is equal to the icing capacity;
the rated voltage U of the primary side1NEqual to the grid voltage of the AC power grid at the access point of the ice melting device.
4. The parameter adaptation method according to claim 2, further comprising:
determining the connection mode of the ice melting switching switch based on the on-site meteorological parameters, and determining the output current of the ice melting switching switch; wherein
When the ambient temperature is lower than a first preset temperature and/or the wind speed is higher than a first wind speed, the ice melting switching knife switch adopts a connection mode of connecting two switches in parallel and connecting one switch in series, and the output current is equal to the rated output current IDCN；
When the ambient temperature is higher than a second preset temperature and/or the wind speed is lower than a second wind speed, the ice melting switching knife switch adopts a two-phase series connection mode, and the output current is equal to 0.75IDCN；
The first preset temperature is equal to or lower than the second preset temperature, and the first wind speed is equal to or higher than the second wind speed.
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