CN109449852B - Distribution line ice melting method in non-power-loss mode - Google Patents

Distribution line ice melting method in non-power-loss mode Download PDF

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Publication number
CN109449852B
CN109449852B CN201810249449.XA CN201810249449A CN109449852B CN 109449852 B CN109449852 B CN 109449852B CN 201810249449 A CN201810249449 A CN 201810249449A CN 109449852 B CN109449852 B CN 109449852B
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ice
ice melting
melting
feeder line
line
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CN109449852A (en
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杨成钢
傅颖
王笑棠
金华芳
赵建文
屈天天
赵汉鹰
王曜飞
林峰
胡志宏
宋艳
刘杨
罗旻
陈扬哲
叶吉超
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State Grid Corp of China SGCC
Lishui Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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State Grid Corp of China SGCC
Lishui Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00Overhead installations of electric lines or cables
    • H02G7/16Devices for removing snow or ice from lines or cables
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06QDATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00Administration; Management
    • G06Q10/04Forecasting or optimisation, e.g. linear programming, "travelling salesman problem" or "cutting stock problem"
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06QDATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00Administration; Management
    • G06Q10/06Resources, workflows, human or project management, e.g. organising, planning, scheduling or allocating time, human or machine resources; Enterprise planning; Organisational models
    • G06Q10/063Operations research or analysis
    • G06Q10/0631Resource planning, allocation or scheduling for a business operation
    • G06Q10/06313Resource planning in a project environment

Abstract

The invention discloses a distribution line ice melting method in a non-power-loss mode. The method comprises the following steps: firstly, a feeder line ice melting terminal is started to monitor environmental data and a line ice coating condition in real time, and when the ice coating thickness of a distribution network line reaches an early warning value, measured meteorological data and ice coating thickness data are transmitted to a main station through a distribution network wireless communication network; then the main station calculates an ice melting current-time relation curve according to the ice melting thickness and meteorological data, transmits the curve to the feeder line ice melting terminal through the distribution network communication network, and switches the feeder line ice melting terminal from a reactive power optimization mode to an ice melting mode; and finally, when the feedback response time of the main station ice melting curve exceeds an allowable value, the feeder line ice melting terminal automatically performs ice melting treatment according to an experience curve issued by the main station in advance. The invention can realize pre-melting ice of the distribution line under the condition of uninterrupted load, avoid the risk of icing, and still ensure the safe and reliable operation of the system under the condition of communication interruption.

Description

Distribution line ice melting method in non-power-loss mode
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a non-power-loss-mode distribution line ice melting method.
Background
In the mountainous area of Lishui city, the damage is serious in the ice disaster of 08 years. From 13 days 1 and 2008, a rare ice disaster suddenly attacks the south of China. According to statistics, the ice disaster causes that 1 seat of a 35 kilovolt substation in a power grid in a Lian city area in the urban area loses electricity, a 35 kilovolt line tower (broken) falls 17 bases, a 10 kilovolt line tower (broken) falls 283 bases, a low-voltage line tower (broken) falls 256 bases, and the total 200 kilometers of power supply line breakage. At one time, 205 natural villages, 23027 households and 7 ten thousand and 8 thousands of people in the lotus region are subjected to outage, and the distribution network lines of part of Jinyun county in Lishui city are located in mountainous regions with higher altitude, so that the disaster is more serious.
Although beneficial experiences are obtained at the design and operation stages of the line at home and abroad at present, the line comprises a load ice melting technology and a short circuit ice melting technology which are emphasized to operate, and also comprises a novel line for preventing ice coating and a technology for strengthening a design type line, the technologies have certain difficulties in popularization, and the ice melting of a power grid is mainly performed by high-voltage direct-current ice melting at present, and is mainly suitable for high-voltage lines. When the distribution network line is iced, a common road, particularly a mountain-entering road cannot pass through, and due to the characteristic of the open-loop structure operation of the distribution network line, a plurality of distribution transformers are generally hung on the feeder line. Requiring a person to drive in and close directly, which is not feasible in itself. Therefore, the ice melting technology of the power distribution network is different from the direct current ice melting technology of the high-voltage network, the ice melting technology under a non-power-loss mode needs to be considered, and the operation reliability of the power grid is improved.
Disclosure of Invention
In order to solve the problems, the invention provides a distribution line ice melting method in a non-power-loss mode, which can realize pre-ice melting of a distribution line under the condition that the load is not interrupted, avoid the risk of ice coating, and still ensure the safe and reliable operation of a system under the condition that the communication is interrupted.
In order to solve the problems, the invention adopts the following technical scheme:
the invention discloses a non-power-loss-mode distribution line ice melting method, which comprises the following steps of:
s1: the feeder line ice melting terminal is started to monitor environmental data, line data and an ice coating situation in real time, and when the ice coating thickness of the distribution network line reaches an early warning value, the feeder line ice melting terminal transmits the measured environmental data and the measured ice coating thickness data to the main station through the distribution network wireless communication network;
s2: the main station calculates an ice melting current-time relation curve according to the environmental data and the ice coating thickness, sends the calculated ice melting current-time relation curve to the feeder line ice melting terminal through the distribution network wireless communication network, and switches the feeder line ice melting terminal from a reactive power optimization mode to an ice melting mode;
s3: and when the feedback response time of the ice melting current-time relation curve of the main station exceeds an allowable value, the feeder line ice melting terminal automatically performs ice melting treatment according to an ice melting current-time empirical curve issued by the main station in advance.
Preferably, the feeder line ice melting terminal comprises a high-voltage parallel capacitor bank, an outdoor/internal alternating-current high-voltage vacuum switch and a special voltage transformer, has the functions of data acquisition, real-time communication and feeder line ice melting, is provided with two working modes of reactive power optimization and feeder line ice melting, and is installed at the tail end of a feeder line easy to cover ice.
Preferably, the environmental data includes an outside air temperature, a wind speed, a rime/rime condition, and the line data includes a wire temperature, a diameter, a line current, a voltage, an active power, a reactive power, and a power factor.
Preferably, the distribution network wireless communication network adopts a network structure combining a main station-transformer station backbone network and a transformer station-feeder line ice melting terminal branch network, a three-layer switch is adopted to realize the connection between the backbone network and the branch network, the transformer station collects and integrates the operation data collected by the feeder line ice melting terminal through the branch network, the operation data are uploaded to the main station through the backbone network, the main station analyzes and calculates the data, and the decision instruction is issued to the feeder line ice melting terminal step by step.
Preferably, the characteristic expression of the ice-melting current-time relation curve is as follows:
whereinIrFor melting the ice current, R0Is the resistance of the wire at 0 ℃ TrFor the time of ice melting,. DELTA.t is the difference between the conductor temperature and the outside air temperature, g0Is the specific gravity of ice, b is the thickness of ice layer, D is the outer diameter of conductor after ice coating, RT0D is the diameter of the wire, Lnλ is the thermal conductivity coefficient for wire length, 2.27 × 10 for rime-2For rime lambda is 0.12X 10-2,RTFreezing fog for convection and radiation equivalent thermal resistanceFor rimeWherein V is the wind speed.
Preferably, in step S2, the reactive power optimization mode of the feeder line ice melting terminal adopts a power distribution network reactive voltage optimization control strategy based on three-level coordination, and coordinates and optimizes the distribution network reactive power from three dimensions, namely, a target dimension, a time dimension and a space dimension. The method mainly relates to the voltage regulation control of an on-load voltage regulation main transformer, the control of reactive compensation equipment in a station, the control of a 10kV line voltage regulator, the control of 10kV reactive compensation equipment, the voltage regulation control of an on-load voltage regulation distribution transformer, the control of distribution transformer low-voltage reactive compensation and the voltage monitoring of low-voltage users in a distribution transformer area.
The three dimensions are embodied as: in the aspect of target dimension, multi-target decomposition coordination control is carried out aiming at the targets of safe and stable operation of a power system, reduction of network loss, improvement of voltage quality, reduction of reactive power equipment regulation times and the like; in the space dimension, aiming at high voltage, medium voltage and low voltage, decomposition and coordination among three voltage levels are carried out; in the time dimension, the coordination control of different time scales is carried out aiming at the problems of economy and voltage safety.
Preferably, in step S2, the ice melting mode of the feeder line ice melting terminal adopts a terminal reactive power transfer mode, and the ice melting process needs to perform power distribution network voltage budget at the same time to meet the feeder line voltage constraint; the method for estimating the voltage of the power distribution network comprises the steps of judging from bottom to top, correcting from top to bottom, starting a voltage correction function when the voltage exceeds the limit, taking the condition of fluctuation change of the load into consideration, and generating a remote regulation or remote control command for control by taking the condition of qualified recovered voltage as a target.
The invention has the beneficial effects that:
(1) the invention provides a pre-ice-melting idea, changes post-treatment into pre-active treatment, and actively starts a pre-ice-melting mode to avoid the risk of ice coating under the condition that the risk of ice coating is about to occur, and meanwhile, a distribution network does not need to be powered off during ice-melting treatment.
(2) The ice melting method provided by the invention meets the requirement of feeder line ice melting, and simultaneously, realizes the coordinated optimization control of the reactive voltage of the distribution network by collecting the real-time data such as remote measurement remote traffic of each point of the distribution network and the like to perform reactive power optimization analysis, and meets the requirements of the current distribution network on various aspects of production management, loss reduction, energy saving and the like.
(3) The ice melting method for the distribution line establishes a control response mechanism of the distribution network under the condition of communication interruption, and due to the fact that outdoor operation equipment of the distribution network is dispersed in most regions and communication means is lack, a wireless communication-based mode is considered, and for the distribution network with huge network conditions, when the communication interruption occurs, the ice melting terminal automatically performs ice melting treatment according to an ice melting current-time experience curve issued by a master station in advance, and the distribution line can still run safely and reliably.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of a line of a chestnut tree in the embodiment;
FIG. 3 shows the current (unit: A) of each feeder section of the wooden chestnut line main trunk line in the embodiment.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the ice melting method for the distribution line in the non-power-loss mode in the embodiment is shown in fig. 1, and comprises the following steps:
s1: starting a feeder line ice melting terminal to monitor environmental data, line data and an ice coating condition in real time, wherein the environmental data comprise an outside air temperature, an air speed and a rime/rime condition, and the line data comprise a wire temperature, a diameter, a line current, a voltage, active power, reactive power and a power factor;
when the icing thickness of the distribution network line reaches an early warning value, the feeder line deicing terminal transmits the measured environmental data and the icing thickness data to the main station through the distribution network wireless communication network;
s2: the main station calculates an ice melting current-time relation curve according to the environmental data and the ice coating thickness, and the characteristic expression of the ice melting current-time relation curve is as follows:
wherein the content of the first and second substances,
Ir-an ice-melting current;
R0-wire resistance at 0 ℃;
Tr-ice melting time;
Δ t-the difference between the conductor temperature and the outside air temperature;
g0specific gravity of ice (typically 0.9 as rimed);
b-ice layer thickness;
d is the outer diameter of the conductor after ice coating;
RT0-equivalent ice layer conductive resistance;
d is the wire diameter;
Ln-the length of the wire;
λ -coefficient of thermal conductivity, 2.27X 10 for freezing rain-2For rime lambda is 0.12X 10-2
RTConvection and radiation equivalent thermal resistance to rimeFor rimeWherein V is the wind speed;
according to the formula, under the condition that the external meteorological conditions (wind speed and air temperature) and the ice coating thickness are known, a relation curve of the size of the ice melting current and the time required by ice melting can be obtained, and when ice melting operation is carried out, the basic ice melting time can be calculated by utilizing the formula through the initial ice melting current;
the calculated ice melting current-time relation curve is sent to the feeder line ice melting terminal through a distribution network wireless communication network, the feeder line ice melting terminal is switched from a reactive power optimization mode to an ice melting mode, and reactive power is injected into the feeder line from the tail end according to requirements;
s3: when the feedback response time of the ice melting current-time relation curve of the main station exceeds an allowable value (namely the feeder line ice melting terminal does not receive the ice melting current-time relation curve issued by the main station within a set time), the feeder line ice melting terminal automatically performs ice melting treatment according to the ice melting current-time experience curve issued by the main station in advance.
Due to outdoor operation equipment of the power distribution network, most areas are scattered, and communication means are lacked. In consideration of a mode mainly based on wireless communication, for a power distribution network with a huge network condition, the system can still run safely and reliably under the condition that communication interruption needs to be fully considered.
The method comprises the following steps that a feeder line ice melting terminal with adjustable capacity is used as a control node, a main station issues an ice melting current-time relation curve or a target to the feeder line ice melting terminal, and the feeder line ice melting terminal controls local equipment to operate; when the feedback response time of the ice melting curve of the main station exceeds an allowable value, namely communication is interrupted, the feeder line ice melting terminal automatically carries out ice melting treatment according to an ice melting current-time experience curve issued by the main station in advance, and the real-time communication of the main station is not required.
The feeder line ice melting terminal comprises a high-voltage parallel capacitor bank, an outdoor/internal alternating-current high-voltage vacuum switch and a special voltage transformer, has the functions of data acquisition, real-time communication and feeder line ice melting, is provided with two working modes of reactive power optimization and feeder line ice melting, and is installed at the tail end of a feeder line easy to cover ice.
The distribution network wireless communication network adopts a network structure combining a main station-transformer substation trunk network and a transformer substation-feeder line ice melting terminal branch network, a three-layer switch is adopted to realize the connection of the main network and the branch network, the transformer substation collects and integrates the operation data collected by the feeder line ice melting terminal through the branch network, the operation data is uploaded to the main station through the main network, the main station analyzes and calculates the data, and a decision instruction is issued to the feeder line ice melting terminal step by step.
In the step S2, the reactive power optimization mode of the feeder line ice melting terminal adopts a three-level coordination-based distribution network reactive voltage optimization control strategy, and the distribution network reactive power is coordinated and optimized from three dimensions of a target, time and space. The method mainly relates to the voltage regulation control of an on-load voltage regulation main transformer, the control of reactive compensation equipment in a station, the control of a 10kV line voltage regulator, the control of 10kV reactive compensation equipment, the voltage regulation control of an on-load voltage regulation distribution transformer, the control of distribution transformer low-voltage reactive compensation and the voltage monitoring of low-voltage users in a distribution transformer area.
The three dimensions are embodied as: in the aspect of target dimension, multi-target decomposition coordination control is carried out aiming at the targets of safe and stable operation of a power system, reduction of network loss, improvement of voltage quality, reduction of reactive power equipment regulation times and the like; in the space dimension, aiming at high voltage, medium voltage and low voltage, decomposition and coordination among three voltage levels are carried out; in the time dimension, the coordination control of different time scales is carried out aiming at the problems of economy and voltage safety.
In the step S2, the ice melting mode of the feeder line ice melting terminal adopts a terminal reactive power transfer mode, and the ice melting process needs to simultaneously perform power distribution network voltage budget to meet feeder line voltage constraint; the method for estimating the voltage of the power distribution network comprises the steps of judging from bottom to top, correcting from top to bottom, starting a voltage correction function when the voltage exceeds the limit, taking the condition of fluctuation change of the load into consideration, and generating a remote regulation or remote control command for control by taking the condition of qualified recovered voltage as a target.
Taking ice melting of a wood chestnut line as an example, a main trunk line is an overhead LGJ-95, a line structure is shown in fig. 2, line holding current and ice melting current within 1 hour are shown in table 1 at different environmental temperatures, and table 1 is ice melting current of the wood chestnut line LGJ-95 overhead line (ice melting within 1 hour).
TABLE 1
Carrying out simplified equivalent processing on the wood chestnut line, and setting the load power as follows: 1915kW, 373 kVar. Reactive power is injected at the trunk line intersection point at the branch line of the subbird village, simulation results are shown in tables 2 and 3, wherein the table 2 shows the current (A) of each section of the trunk line and the branch line of the wooden chestnut line, and the table 3 shows the voltage (kV) of each section of the trunk line and the branch line of the wooden chestnut line.
Line section Non-ice melting device 1MVar 2MVar 3MVar 4MVar 5MVar
Feed line segment 1 123.47 119.83 144.71 187.95 240.52 298.09
Feed line segment 2 122.58 121.44 120.32 119.21 118.11 117.04
Feed line segment 3 122.14 121.00 119.88 118.77 117.68 116.61
Feed line segment 4 117.56 116.46 115.37 114.30 113.25 112.21
Feed line segment 5 115.76 114.67 113.60 112.54 111.50 110.48
Branch line for bird village 0.88 0.87 0.86 0.86 0.85 0.85
Nanxi village branch line 5.31 5.27 5.23 5.19 5.15 5.12
Nanxi station 1.80 1.78 1.77 1.76 1.74 1.73
Nanxi stone grinding field 0.44 0.44 0.44 0.44 0.43 0.43
TABLE 2
TABLE 3
And assuming that the ambient temperature is-3 ℃, the wind speed is 3 m/s and the ice coating is 10mm, the wire-protecting current is 204.1A and the ice melting current is 269.9A.
As can be seen from tables 1 and 2, when the feeder line ice melting terminal is configured with 1MVar, the current of the ice melting section decreases, and the voltage at the end of the line rises to 10.39kV, which belongs to the normal compensation range; when the feeder line ice melting terminal is configured with 2Mvar and 3MVar, the feeder line ice melting terminal enters an overcomplete state, the current of an ice melting section becomes 144.71A and 187.95A, but the current does not reach the line protection current and the ice melting current, the voltage at the tail end of a line rises to 10.47kV and 10.55kV, and the voltage belongs to the voltage qualified range; when the feeder line ice melting terminal is configured with 4Mvar, the current of an ice melting section is increased to 240.52A, the ice melting section reaches the line protection current, the ice melting current is not reached, the voltage at the tail end of the line is raised to 10.63kV, and the voltage is in a qualified voltage range; when the feeder line ice melting terminal is configured with 5MVar, the current of the ice melting section is increased to 289.09A, the ice melting current is reached, the voltage at the tail end of the line is raised to 10.71kV, and the upper limit of the voltage qualification rate is reached, as shown in FIG. 3.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit thereof, and it is intended to cover in the scope of the claims appended hereto.

Claims (5)

1. A non-power-loss-mode distribution line ice melting method is characterized by comprising the following steps:
s1: the feeder line ice melting terminal is started to monitor environmental data, line data and an ice coating situation in real time, and when the ice coating thickness of the distribution network line reaches an early warning value, the feeder line ice melting terminal transmits the measured environmental data and the measured ice coating thickness data to the main station through the distribution network wireless communication network;
s2: the main station calculates an ice melting current-time relation curve according to the environmental data and the ice coating thickness, sends the calculated ice melting current-time relation curve to the feeder line ice melting terminal through the distribution network wireless communication network, and switches the feeder line ice melting terminal from a reactive power optimization mode to an ice melting mode; the characteristic expression of the ice melting current-time relation curve is as follows:
whereinI r In order to melt the ice current,R 0 is the resistance of the wire at 0 ℃,T r to ice melting time, ΔtIs the difference between the conductor temperature and the outside air temperature,g 0is the specific gravity of the ice and is,bthe thickness of the ice layer is the thickness of the ice layer,Dto be guideThe outer diameter of the ice-coated body,R T0in order to be equivalent to the thermal conduction resistance of the ice layer,din order to be the diameter of the wire,L nas the length of the wire,λin order to be a thermal conductivity coefficient, R T equivalent thermal resistance for convection and radiation;
s3: when the ice-melting current-time relation curve feedback response time of the main station exceeds an allowable value, the feeder line ice-melting terminal automatically performs ice-melting treatment according to an ice-melting current-time empirical curve issued by the main station in advance;
the feeder line ice melting terminal comprises a high-voltage parallel capacitor bank, an outdoor/internal alternating-current high-voltage vacuum switch and a special voltage transformer, has the functions of data acquisition, real-time communication and feeder line ice melting, is provided with two working modes of reactive power optimization and feeder line ice melting, and is installed at the tail end of a feeder line easy to cover ice.
2. The method of claim 1, wherein the environmental data comprises ambient temperature, wind speed, rime/rime conditions, and the line data comprises wire temperature, diameter, line current, voltage, active power, reactive power, and power factor.
3. The distribution line ice melting method in the non-power-loss mode as claimed in claim 1 or 2, wherein the distribution network wireless communication network adopts a network structure combining a main station-substation network and a branch network of a substation-feeder line ice melting terminal, a three-layer switch is adopted to realize connection between the main network and the branch network, the substation collects and integrates operation data collected by the feeder line ice melting terminal through the branch network, the operation data is uploaded to the main station through the main network, the main station analyzes and calculates the data, and a decision instruction is issued to the feeder line ice melting terminal step by step.
4. The method for melting ice on distribution lines in a non-power-loss mode according to claim 1 or 2, wherein in the step S2, the reactive power optimization mode of the feeder line ice melting terminal adopts a three-level coordination-based distribution network reactive voltage optimization control strategy, and the distribution network reactive power is coordinately optimized from three dimensions of a target, time and space.
5. The ice melting method for the distribution line in the non-power-loss mode according to claim 1 or 2, wherein in the step S2, the ice melting mode of the feeder line ice melting terminal adopts a terminal reactive power transfer mode, and the ice melting process needs to perform distribution network voltage budget at the same time to meet feeder line voltage constraints; the method for estimating the voltage of the power distribution network comprises the steps of judging from bottom to top, correcting from top to bottom, starting a voltage correction function when the voltage exceeds the limit, taking the condition of fluctuation change of the load into consideration, and generating a remote regulation or remote control command for control by taking the condition of qualified recovered voltage as a target.
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