CN107947140B - Control method and device for power fluctuation overvoltage of half-wavelength power transmission line - Google Patents

Control method and device for power fluctuation overvoltage of half-wavelength power transmission line Download PDF

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CN107947140B
CN107947140B CN201711043825.1A CN201711043825A CN107947140B CN 107947140 B CN107947140 B CN 107947140B CN 201711043825 A CN201711043825 A CN 201711043825A CN 107947140 B CN107947140 B CN 107947140B
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overvoltage
power fluctuation
wavelength
transmission line
configuration strategy
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CN107947140A (en
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张媛媛
王毅
李连海
班连庚
项祖涛
韩彬
宋瑞华
郑彬
杨大业
宋修友
崔林
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State Grid Corp of China SGCC
Beijing Jiaotong University
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
Beijing Jiaotong University
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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Abstract

The invention provides a method and a device for controlling power fluctuation overvoltage of a half-wavelength power transmission line, wherein a differential configuration strategy of an arrester along the half-wavelength power transmission line is obtained through the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in a uniform configuration strategy, and whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy meet the power fluctuation limiting requirement or not is judged, if yes, the differential configuration strategy is optimized, and otherwise, the differential configuration strategy is corrected. The invention defines the power fluctuation overvoltage and the characteristics of the half-wavelength power transmission line for the first time and provides a basis for the research of the half-wavelength power transmission line; the invention can effectively solve the problem of power fluctuation overvoltage of the half-wavelength power transmission system, and provides basis and foundation for inhibiting the power fluctuation overvoltage of the half-wavelength power transmission line.

Description

Control method and device for power fluctuation overvoltage of half-wavelength power transmission line
Technical Field
The invention relates to the technical field of power systems, in particular to a method and a device for controlling power fluctuation overvoltage of a half-wavelength power transmission line.
Background
The half-wavelength power transmission technology (HWACT) refers to a three-phase alternating current power transmission technology with the power frequency half-wavelength close to the power frequency half-wavelength, namely, the ultra-long distance of about 3000km (50Hz) or about 2600km (60Hz), and has the advantages of full-line reactive power self-balancing, no need of installing reactive power compensation equipment and no need of arranging an intermediate switch station. The system has strong power transmission capability and better economy and reliability, and can realize long-distance synchronous networking. With the push of the global energy internet, half-wave power transmission is widely concerned as a scheme suitable for large-scale power intercontinental transmission.
However, engineering application of half-wavelength power transmission is also urgently needed to solve some technical problems such as safety and stability control, overvoltage and secondary current suppression, relay protection configuration and the like, wherein the overvoltage suppression is one of the key problems restricting the half-wavelength power transmission application. Due to the special circuit structure of the half-wavelength power transmission line, the overvoltage characteristics of the half-wavelength power transmission line are greatly different from those of the conventional power transmission line. Under the fault conditions of single-phase grounding, two-phase-to-ground short circuit, three-phase grounding short circuit, interphase short circuit and the like, the half-wavelength characteristic of the half-wavelength power transmission line is damaged, the transient overvoltage problem excited by a fault phase and an adjacent sound phase is extremely prominent under the action of a capacitance-rise effect and parameter resonance, and a serious fault point can reach multiple times, so that the half-wavelength power transmission line is the key point for suppressing the overvoltage of the half-wavelength power transmission line.
The half-wavelength power transmission line is additionally provided with the lightning arrester, so that the overvoltage problem of the half-wavelength power transmission line can not be solved, and the half-wavelength power transmission line can not be safely operated.
Disclosure of Invention
In order to overcome the defect that a half-wavelength power transmission line cannot safely operate due to overvoltage caused by fault in the prior art, the invention provides a method and a device for controlling power fluctuation overvoltage of the half-wavelength power transmission line And if the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage meet the power fluctuation limiting requirement at the same time, optimizing the differential configuration strategy, and otherwise, correcting the differential configuration strategy to obtain the final differential configuration strategy.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a control method of half-wavelength power transmission line power fluctuation overvoltage, which comprises the following steps:
determining the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in a uniform configuration strategy and a uniform configuration strategy of the arrester along the half-wavelength power transmission line;
determining a differential configuration strategy of the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy;
and judging whether the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, if so, optimizing the differential configuration strategy, and otherwise, correcting the differential configuration strategy.
The power fluctuation overvoltage of the half-wavelength power transmission line comprises overvoltage which occurs on the half-wavelength power transmission line when power fluctuation generated under the condition that the half-wavelength power transmission line has a fault exceeds natural power;
the amplitude of the power fluctuation overvoltage is proportional to the ratio of the power fluctuation to the natural power of the half-wavelength power transmission line;
the duration of the power fluctuation overvoltage is consistent with the power fluctuation time of the half-wavelength power transmission line;
and if the fault is a single-phase instantaneous earth fault, the fault process of the single-phase instantaneous earth fault comprises a fault period process, a reclosing process and a swinging process.
The uniform configuration strategy of the arrester along the half-wavelength power transmission line is determined according to the following processes:
the half-wavelength transmission line is evenly divided into a plurality of line units in a fixed length, and the same groups of lightning arresters are arranged at the end points of each line unit.
The maximum absorption energy of the arrester under the action of power fluctuation overvoltage in the uniform configuration strategy is determined according to the following process:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, the maximum absorption energy of the lightning arrester under the action of power fluctuation overvoltage in the uniform configuration strategy is determined through an electromagnetic transient simulation model of the half-wavelength power transmission system.
The differential configuration strategy for determining the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in the uniform configuration strategy comprises the following steps:
the lightning arresters are arranged at the tail end points and the interior of each line unit on the principle that the maximum absorption energy of a single group of lightning arresters does not exceed 80% of the energy absorption capacity of the lightning arresters, at most two groups of lightning arresters are arranged at each lightning arrester installation position, and the lightning arresters are preferentially arranged at the tail ends of the line units.
The terminal end point and the internally installed arrester of the line unit include:
determining the number of terminal ends of the line units and the number of installations of the internal arresters, comprising:
the terminal end points and the interior of the line unit are provided with m groups of lightning arresters, and the maximum absorption energy of the lightning arresters under the action of power fluctuation overvoltage in the uniform configuration strategy is EUWhen E isU＜0.8EMWhen m is 1; when E isU≥0.8EMWhen m is ═ EU/0.8EM]，[]Denotes rounding off, where EMThe ability to withstand the energy absorbed by the arrester;
determining the installation positions of the terminal end points of the line units and the internal arresters, including:
when m is 1, a group of lightning arresters are installed at the tail end of the line unit;
when m is 2, two groups of lightning arresters are installed at the end points of the tail end of the line unit;
when m is more than or equal to 3, two groups of lightning arresters are installed at the end points of the tail end of the line unit, and the rest lightning arresters are arranged in the line unit according to the following modes:
the rest lightning arresters are arranged at positions which are at distances of d, 2d, … and kd from the tail end of the line unit, wherein k is a natural number, d represents the span of the half-wavelength transmission line, and when m is an even number,
Figure BDA0001451794890000031
when m is an odd number, the number of the carbon atoms,
Figure BDA0001451794890000032
the determining of the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategy comprises the following steps:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in a differential configuration strategy through an electromagnetic transient simulation model of the half-wavelength power transmission system.
The power fluctuation limit requirements include:
1) the power fluctuation overvoltage of the transformer substation line side is not more than 1.4p.u., and the duration time of the power fluctuation overvoltage of the transformer substation line side is not more than 0.5 s;
2) the power fluctuation overvoltage amplitude of the half-wavelength power transmission line and the duration of the power fluctuation overvoltage of the half-wavelength power transmission line meet the temporary overvoltage tolerance performance of the lightning arrester;
3) the maximum absorption energy of the arrester along the half-wavelength power transmission line under the action of power fluctuation overvoltage meets the tolerance capability of the arrester for absorbing energy.
The optimizing the differential configuration strategy comprises:
the installation position of the lightning arrester on the half-wavelength transmission line is set to be L1,…,Lh,…,LHThe maximum absorption energy of the single-group lightning arrester is EhH is 1,2, …, H, H represents the total number of installation positions of the lightning arrester on the half-wavelength transmission line;
if Eh＜0.5EMAnd the terminal of the line unit and the interior share at least two groups of lightning arresters, and the differentiated configuration strategy is updated according to the principle that one group of lightning arresters is reduced from the head end of the line unit to the tail end of the line unit each time, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the updated differential configuration strategy according to an electromagnetic transient simulation model of the half-wavelength power transmission system, judging whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the updated differential configuration strategy simultaneously meet the power fluctuation limiting requirement, if so, taking the updated differential configuration strategy as a final arrester configuration strategy, and otherwise, taking the differential configuration strategy before updating as a final arrester configuration strategy;
if 0.5EM≤Eh≤EMAnd the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and then the differential configuration strategy is used as a final arrester configuration strategy.
The correcting the differential configuration strategy comprises:
setting the terminal end point of the line unit and the installation position of the internal lightning arrester as L1,…,Li,…,LNI is 1,2, …, N represents the total number of lightning arrester installation positions in the line unit, LiIndicates the ith mounting position;
if L isiClose to L1Then at L1And near the head end of the line unit and with L1Correcting the differential configuration strategy at the position with the distance d according to the principle of adding a group of lightning arresters at each time until the power fluctuation overvoltage, the duration time of the power fluctuation overvoltage and the maximum absorption energy of the lightning arresters under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and correcting the corrected differenceThe configuration strategy is changed to be used as a final arrester configuration strategy;
if L isiClose to LNThen near the end of the half-wavelength transmission line and LNAnd (d) correcting the differential configuration strategy at the position with the distance d according to the principle of adding a group of lightning arresters at each time until the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arresters under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and taking the corrected differential configuration strategy as the final lightning arrester configuration strategy.
The invention also provides a control device for the power fluctuation overvoltage of the half-wavelength power transmission line, which comprises the following components:
the first determining module is used for determining the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in a uniform configuration strategy and a uniform configuration strategy of the arrester along the half-wavelength power transmission line;
the second determination module is used for determining a differential configuration strategy of the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy;
and the judging module is used for judging whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage meet the power fluctuation limiting requirement or not in the differential configuration strategy, optimizing the differential configuration strategy if the power fluctuation overvoltage and the duration of the power fluctuation overvoltage meet the power fluctuation limiting requirement, and correcting the differential configuration strategy if the power fluctuation overvoltage and the power fluctuation overvoltage meet the power fluctuation limiting requirement.
The power fluctuation overvoltage of the half-wavelength power transmission line comprises overvoltage which occurs on the half-wavelength power transmission line when power fluctuation generated under the condition that the half-wavelength power transmission line has a fault exceeds natural power;
the amplitude of the power fluctuation overvoltage is proportional to the ratio of power fluctuation to natural power of the half-wavelength power transmission line;
the duration of the power fluctuation overvoltage is consistent with the power fluctuation time of the half-wavelength power transmission line;
and if the fault is a single-phase instantaneous earth fault, the fault process of the single-phase instantaneous earth fault comprises a fault period process, a reclosing process and a swinging process.
The first determining module is specifically configured to:
the half-wavelength transmission line is evenly divided into a plurality of line units in a fixed length, and the same groups of lightning arresters are arranged at the end points of each line unit.
The first determining module is specifically configured to:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, the maximum absorption energy of the lightning arrester under the action of power fluctuation overvoltage in the uniform configuration strategy is determined through an electromagnetic transient simulation model of the half-wavelength power transmission system.
The second determining module is specifically configured to:
the lightning arresters are arranged at the tail end points and the interior of each line unit on the principle that the maximum absorption energy of a single group of lightning arresters does not exceed 80% of the energy absorption capacity of the lightning arresters, at most two groups of lightning arresters are arranged at each lightning arrester installation position, and the lightning arresters are preferentially arranged at the tail ends of the line units.
The second determining module is specifically configured to:
determining the number of terminal ends of the line units and the number of installations of the internal arresters, comprising:
the terminal end points and the interior of the line unit are provided with m groups of lightning arresters, and the maximum absorption energy of the lightning arresters under the action of power fluctuation overvoltage in the uniform configuration strategy is EUWhen E isU＜0.8EMWhen m is 1; when E isU≥0.8EMWhen m is ═ EU/0.8EM]，[]Denotes rounding off, where EMThe ability to withstand the energy absorbed by the arrester;
determining the installation positions of the terminal end points of the line units and the internal arresters, including:
when m is 1, a group of lightning arresters are installed at the tail end of the line unit;
when m is 2, two groups of lightning arresters are installed at the end points of the tail end of the line unit;
when m is more than or equal to 3, two groups of lightning arresters are installed at the end points of the tail end of the line unit, and the rest lightning arresters are arranged in the line unit according to the following modes:
the rest lightning arresters are arranged at positions which are at distances of d, 2d, … and kd from the tail end of the line unit, wherein k is a natural number, d represents the span of the half-wavelength transmission line, and when m is an even number,
Figure BDA0001451794890000061
when m is an odd number, the number of the carbon atoms,
Figure BDA0001451794890000062
the second determining module is specifically configured to:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in a differential configuration strategy through an electromagnetic transient simulation model of the half-wavelength power transmission system.
The determining module is specifically configured to determine the following power fluctuation limitation requirement:
1) the power fluctuation overvoltage of the transformer substation line side does not exceed 1.4p.u., and the duration of the power fluctuation overvoltage of the transformer substation line side is not more than 0.5 s;
2) the amplitude of the power fluctuation overvoltage of the half-wavelength power transmission line and the duration of the power fluctuation overvoltage of the half-wavelength power transmission line meet the temporary overvoltage tolerance of the lightning arrester;
3) the maximum absorption energy of the arrester along the half-wavelength power transmission line under the action of power fluctuation overvoltage meets the tolerance capability of the arrester for absorbing energy.
The judgment module optimizes the differentiated configuration strategy according to the following process:
the installation position of the lightning arrester on the half-wavelength transmission line is set asL1,…,Lh,…,LHThe maximum absorption energy of the single-group lightning arrester is EhH is 1,2, …, H, H represents the total number of installation positions of the lightning arrester on the half-wavelength transmission line;
if Eh＜0.5EMAnd the terminal of the line unit and the interior share at least two groups of lightning arresters, and the differentiated configuration strategy is updated according to the principle that one group of lightning arresters is reduced from the head end of the line unit to the tail end of the line unit each time, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the updated differential configuration strategy according to an electromagnetic transient simulation model of the half-wavelength power transmission system, judging whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the updated differential configuration strategy simultaneously meet the power fluctuation limiting requirement, if so, taking the updated differential configuration strategy as a final arrester configuration strategy, and otherwise, taking the differential configuration strategy before updating as a final arrester configuration strategy;
if 0.5EM≤Eh≤EMAnd the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and then the differential configuration strategy is used as a final arrester configuration strategy.
The judgment module corrects the differentiated configuration strategy according to the following process:
the terminal end point of the line unit and the installation position of the internal lightning arrester are set to be L1,…,Li,…,LNI is 1,2, …, N represents the total number of lightning arrester installation positions in the line unit, LiIndicates the ith mounting position;
if L isiClose to L1Then at L1And near the head end of the line unit and with L1Correcting the difference at the position with the distance d according to the principle of adding one group of lightning arresters at each timeThe differential configuration strategy is adopted until the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage, the duration time of the power fluctuation overvoltage and the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategy simultaneously meets the power fluctuation limiting requirement, and the corrected differential configuration strategy is used as a final arrester configuration strategy;
if L isiClose to LNThen near the end of the half-wavelength transmission line and LNAnd (d) correcting the differential configuration strategy at the position with the distance d according to the principle of adding a group of lightning arresters at each time until the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arresters under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and taking the corrected differential configuration strategy as the final lightning arrester configuration strategy.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention provides a control method of half-wavelength transmission line power fluctuation overvoltage, which comprises the steps of firstly determining the maximum absorption energy of an arrester under the action of the power fluctuation overvoltage in a uniform configuration strategy and a uniform configuration strategy of the arrester along the half-wavelength transmission line, then determining a differential configuration strategy of the arrester along the half-wavelength transmission line according to the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy, determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy, then judging whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, if the power fluctuation overvoltage of the half-wavelength power transmission line is met, optimizing the differential configuration strategy, otherwise, correcting the differential configuration strategy to obtain a final differential configuration strategy, and realizing the control of the power fluctuation overvoltage of the half-wavelength power transmission line;
the invention provides a control device of half-wavelength transmission line power fluctuation overvoltage, which comprises a first determining module, a differential configuration strategy and a second determining module, wherein the first determining module is used for determining the uniform configuration strategy of an arrester along the half-wavelength transmission line and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy, the differential configuration strategy is used for determining the differential configuration strategy of the arrester along the half-wavelength transmission line according to the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy, and determining whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, if the power fluctuation overvoltage of the half-wavelength power transmission line is met, optimizing the differential configuration strategy, otherwise, correcting the differential configuration strategy by a judgment module to finally obtain the final differential configuration strategy, and realizing the control of the power fluctuation overvoltage of the half-wavelength power transmission line;
the control method of the half-wavelength power transmission line power fluctuation overvoltage provided by the invention defines the half-wavelength power transmission line power fluctuation overvoltage for the first time, determines the characteristics of the power fluctuation overvoltage including the amplitude of the power fluctuation overvoltage about the ratio of the power fluctuation to the natural power of the half-wavelength power transmission line and the consistency of the duration time of the power fluctuation overvoltage and the power fluctuation time of the half-wavelength power transmission line, and provides a foundation for the research of the half-wavelength power transmission line;
the power fluctuation limiting requirements in the control method of the half-wavelength power transmission line power fluctuation overvoltage provided by the invention comprise that the power fluctuation overvoltage at the side of the transformer substation line is not more than 1.4p.u., the duration of the power fluctuation overvoltage at the side of the transformer substation line is not more than 0.5s, the power fluctuation overvoltage amplitude of the half-wavelength power transmission line and the duration of the power fluctuation overvoltage of the half-wavelength power transmission line meet the temporary overvoltage tolerance performance of an arrester, and the maximum absorption energy of the arrester along the half-wavelength power transmission line under the action of the power fluctuation overvoltage meets the absorption energy tolerance capability of the arrester, so that a judgment basis is provided for the control of the power fluctuation overvoltage;
the control method of the half-wavelength power transmission line power fluctuation overvoltage can effectively solve the problem of the half-wavelength power transmission system power fluctuation overvoltage, can ensure the safe operation of the half-wavelength power transmission system, and provides a basis and foundation for the suppression of the half-wavelength power transmission line power fluctuation overvoltage;
the control method for the power fluctuation overvoltage of the half-wavelength power transmission line solves the technical problem of novel overvoltage (namely the power fluctuation overvoltage of the half-wavelength power transmission line) faced by the half-wavelength power transmission technology, and provides powerful technical support for the implementation of the half-wavelength alternating current power transmission technology test engineering.
Drawings
Fig. 1 is a flowchart of a method for controlling power fluctuation overvoltage of a half-wavelength power transmission line in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a timing sequence and a process of a single-phase ground transient fault occurring in a half-wavelength power transmission line in embodiment 1 of the present invention;
fig. 3 is a schematic wiring diagram of a half-wavelength power transmission system in embodiment 2 of the present invention;
FIG. 4 is a power waveform diagram of three phases at the beginning of a healthy phase in a single-phase instantaneous ground fault process of an extra-high voltage half-wavelength transmission line in embodiment 2 of the present invention;
fig. 5 is a schematic diagram of power fluctuation overvoltage distribution characteristics of an extra-high voltage half-wavelength power transmission line in a single-phase instantaneous ground fault process in embodiment 2 of the present invention;
fig. 6 is a waveform diagram of power fluctuation overvoltage in the middle of a sound phase line of an extra-high voltage half-wavelength transmission line in the single-phase instantaneous ground fault process in embodiment 2 of the present invention;
fig. 7 is a schematic diagram of the maximum absorption energy distribution characteristic of the arrester along the extra-high voltage half-wavelength power transmission line under the uniform configuration strategy in embodiment 2 of the present invention;
fig. 8 is a schematic diagram of the number of lightning arresters to be configured for line units of the extra-high voltage half-wavelength power transmission line under the differential configuration strategy in embodiment 2 of the present invention;
fig. 9 is a schematic diagram of a configuration strategy of 8 groups of lightning arresters of the 10 th line unit under the differential configuration strategy in embodiment 2 of the present invention;
fig. 10 is a schematic diagram of a configuration strategy of 7 groups of lightning arresters of the 12 th line unit under the differential configuration strategy in embodiment 2 of the present invention;
fig. 11 is a power fluctuation overvoltage waveform diagram of the extra-high voltage half-wavelength transmission line under the scheme of the differentiation strategy in embodiment 2 of the present invention;
fig. 12 is a diagram of a maximum absorbed energy distribution of an arrester along an extra-high voltage half-wavelength transmission line under a differentiated configuration strategy in embodiment 2 of the present invention;
fig. 13 is a power fluctuation overvoltage waveform diagram of the extra-high voltage half-wavelength transmission line under the optimized differentiated configuration strategy in embodiment 2 of the present invention;
fig. 14 is a maximum absorption energy distribution diagram of the lightning arresters along the extra-high voltage half-wavelength power transmission line under the optimized differentiated configuration strategy in embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Embodiment 1 of the present invention provides a method for controlling power fluctuation overvoltage of a half-wavelength power transmission line, a specific flowchart of the method is shown in fig. 1, and the specific process is as follows:
s101: determining the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in a uniform configuration strategy and a uniform configuration strategy of the arrester along the half-wavelength power transmission line;
s102: determining a differential configuration strategy of the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy obtained in the S101, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategy;
s103: and judging whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differentiated configuration strategy obtained in the step S102 simultaneously meet the power fluctuation limiting requirement, if so, optimizing the differentiated configuration strategy, and otherwise, correcting the differentiated configuration strategy.
The power fluctuation overvoltage of the half-wavelength power transmission line mentioned in embodiment 1 of the present invention refers to: overvoltage occurs on the half-wavelength transmission line when power fluctuation generated under the condition of a fault occurs on the half-wavelength transmission line exceeds natural power;
the amplitude of the power fluctuation overvoltage is in direct proportion to the ratio of the power fluctuation to the natural power of the half-wavelength power transmission line;
the duration of the power fluctuation overvoltage is consistent with the power fluctuation time of the half-wavelength power transmission line;
if the fault is a single-phase instantaneous earth fault, the fault process of the single-phase instantaneous earth fault comprises a fault period process, a reclosing process and a swinging process, a specific time sequence and a process of the single-phase instantaneous earth fault of the half-wavelength power transmission line are shown in fig. 2, and t in fig. 20Is the time when the half-wavelength power transmission line has single-phase earth fault, tB1The time of tripping of the fault phase breaker; t is tB2The reclosing time of the fault phase breaker.
S101 specifically comprises the following steps:
1. determining a uniform configuration strategy of the arrester along the half-wavelength power transmission line according to the following processes:
uniformly dividing the half-wavelength power transmission line into a plurality of line units in a fixed length, and installing the same group number of lightning arresters at the end point of each line unit;
2. determining the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in a uniform configuration strategy according to the following process:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, the maximum absorption energy of the lightning arrester under the action of power fluctuation overvoltage in the uniform configuration strategy is determined through an electromagnetic transient simulation model of the half-wavelength power transmission system.
S102 specifically comprises the following steps:
1. the differential configuration strategy of the arrester along the half-wavelength power transmission line is determined according to the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in the uniform configuration strategy, and the specific process is as follows:
the method comprises the following steps of installing the lightning arresters at the tail end point and inside each line unit on the basis that the maximum absorption energy of a single group of lightning arresters does not exceed 80% of the absorption energy tolerance capacity of the lightning arresters, the maximum two groups of lightning arresters are installed at the installation position of each lightning arrester, and the lightning arresters are preferentially installed at the tail ends of the line units; the specific process of installing the lightning arrester inside and at the end of the line unit is as follows:
1) the method for determining the installation number of the terminal end points of the line units and the internal arresters specifically comprises the following steps:
the terminal end points and the interior of the line unit are provided with m groups of lightning arresters, and the maximum absorption energy of the lightning arresters under the action of power fluctuation overvoltage in the uniform configuration strategy is EUWhen E isU＜0.8EMWhen m is 1; when E isU≥0.8EMWhen m is ═ EU/0.8EM]，[]Denotes rounding off, where EMThe ability to withstand the energy absorbed by the arrester;
2) the installation positions of the tail end terminal of the line unit and the internal lightning arrester are determined, and the following three conditions are specifically provided:
when m is 1, a group of lightning arresters are installed at the end points of the tail ends of the line units;
when m is 2, two groups of lightning arresters are arranged at the end points of the tail end of the circuit unit;
and when m is more than or equal to 3, two groups of lightning arresters are installed at the end points of the tail end of the line unit, and the rest lightning arresters are configured inside the line unit according to the following modes:
the rest lightning arresters are arranged at positions which are at distances of d, 2d, … and kd from the tail end of the line unit, wherein k is a natural number, d represents the span of the half-wavelength transmission line, and when m is an even number,
Figure BDA0001451794890000111
when m is an odd number, the number of the carbon atoms,
Figure BDA0001451794890000112
2. determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in a differentiated configuration strategy, wherein the specific process comprises the following steps:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in a differential configuration strategy through an electromagnetic transient simulation model of the half-wavelength power transmission system.
The power fluctuation limitation requirement described above specifically includes the following three aspects:
1) the power fluctuation overvoltage of the transformer substation line side is not more than 1.4p.u., and the duration time of the power fluctuation overvoltage of the transformer substation line side is not more than 0.5 s;
2) the amplitude of the power fluctuation overvoltage of the half-wavelength power transmission line and the duration of the power fluctuation overvoltage of the half-wavelength power transmission line meet the temporary overvoltage tolerance of the lightning arrester;
3) the maximum absorption energy of the arrester along the half-wavelength power transmission line under the action of power fluctuation overvoltage meets the tolerance capability of the arrester for absorbing energy.
In the above S103, when the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage, and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously satisfy the power fluctuation limitation requirement, the differential configuration strategy is optimized according to the following procedures:
firstly, the installation position of the lightning arrester on the half-wavelength transmission line is set to be L1,…,Lh,…,LHThe maximum absorption energy of the single-group lightning arrester is EhH is 1,2, …, H, H represents the total number of installation positions of the lightning arrester on the half-wavelength transmission line;
then, the following two cases are divided:
if Eh＜0.5EMAnd the end of the line unitThe end points and the interior share at least two groups of lightning arresters, the differentiated configuration strategy is updated according to the principle that one group of lightning arresters is reduced from the head end of the line unit to the tail end of the line unit each time, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the updated differential configuration strategy according to an electromagnetic transient simulation model of the half-wavelength power transmission system, judging whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the updated differential configuration strategy simultaneously meet the power fluctuation limiting requirement, if so, taking the updated differential configuration strategy as a final arrester configuration strategy, and otherwise, taking the differential configuration strategy before updating as a final arrester configuration strategy;
if 0.5EM≤Eh≤EMAnd the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and then the differential configuration strategy is used as a final arrester configuration strategy.
In the above S103, when the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage, and the maximum absorption energy of the arrester under the power fluctuation overvoltage in the differential configuration strategy cannot simultaneously satisfy the power fluctuation restriction requirement, the differential configuration strategy is modified according to the following procedures:
the terminal end point of the line unit and the installation position of the internal lightning arrester are set to be L1,…,Li,…,LNI is 1,2, …, N represents the total number of lightning arrester installation positions in the line unit, LiIndicates the ith mounting position;
then, the following two cases are divided:
if LiClose to L1Then at L1And near the head end of the line unit and with L1Adding a group of lightning arresters at the position with the distance d each timeCorrecting the differential configuration strategy until the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and taking the corrected differential configuration strategy as a final arrester configuration strategy;
if LiClose to LNThen near the end of the half-wavelength transmission line and LNAnd (d) correcting the differential configuration strategy at the position with the distance d according to the principle of adding a group of lightning arresters at each time until the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arresters under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and taking the corrected differential configuration strategy as the final lightning arrester configuration strategy.
Based on the same inventive concept, embodiment 1 of the present invention further provides a control device for power fluctuation overvoltage of a half-wavelength power transmission line, the principle of the devices for solving the problems is similar to the control method for power fluctuation overvoltage of a half-wavelength power transmission line, the control device for power fluctuation overvoltage of a half-wavelength power transmission line provided in embodiment 1 of the present invention includes a first determining module, a second determining module and a judging module, and the specific functions of the three modules are respectively described below:
the first determining module is used for determining the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in a uniform configuration strategy and a uniform configuration strategy of the arrester along the half-wavelength power transmission line;
the second determining module is used for determining a differential configuration strategy of the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy;
the judging module is used for judging whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage meet the power fluctuation limiting requirement or not in the differential configuration strategy, if so, the differential configuration strategy is optimized, and otherwise, the differential configuration strategy is corrected.
The power fluctuation overvoltage of the half-wavelength power transmission line refers to: overvoltage occurs on the half-wavelength power transmission line when power fluctuation generated under the condition of a fault on the half-wavelength power transmission line exceeds natural power;
the amplitude of the power fluctuation overvoltage is in direct proportion to the ratio of the power fluctuation to the natural power of the half-wavelength power transmission line;
the duration of the power fluctuation overvoltage is consistent with the power fluctuation time of the half-wavelength power transmission line;
if the fault is a single-phase instantaneous earth fault, the fault process of the single-phase instantaneous earth fault comprises a fault period process, a reclosing process and a swinging process.
The first determining module determines a uniform configuration strategy of the half-wavelength power transmission line lightning arrester according to the following processes:
the half-wavelength transmission line is evenly divided into a plurality of line units in a fixed length, and the same groups of lightning arresters are arranged at the end points of each line unit.
The first determining module determines the maximum absorption energy of the lightning arrester under the action of power fluctuation overvoltage in the uniform configuration strategy according to the following process:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, the maximum absorption energy of the lightning arrester under the action of power fluctuation overvoltage in the uniform configuration strategy is determined through an electromagnetic transient simulation model of the half-wavelength power transmission system.
The second determining module determines the differential configuration strategy of the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in the uniform configuration strategy according to the following processes:
the method is characterized in that the maximum absorption energy of a single group of lightning arresters does not exceed 80% of the absorption energy tolerance capacity of the lightning arresters, the maximum two groups of lightning arresters are installed at each lightning arrester installation position, and the lightning arresters are preferentially installed at the tail ends of line units, wherein the specific process of installing the lightning arresters at the tail ends and the interior of the line units is as follows:
1. determining the number of terminal ends of the line units and the number of installations of the internal arresters, comprising:
the terminal end points and the interior of the line unit are provided with m groups of lightning arresters, and the maximum absorption energy of the lightning arresters under the action of power fluctuation overvoltage in the uniform configuration strategy is EUWhen E isU＜0.8EMWhen m is 1; when E isU≥0.8EMWhen m is ═ EU/0.8EM]，[]Denotes rounding off, where EMAbsorbing energy tolerance for the lightning arrester;
2. the determination of the terminal end point of the line unit and the installation position of the internal arrester is specifically divided into the following three cases:
when m is 1, a group of lightning arresters are installed at the end points of the tail ends of the line units;
when m is 2, two groups of lightning arresters are arranged at the end points of the tail end of the circuit unit;
and when m is more than or equal to 3, two groups of lightning arresters are installed at the tail end of the line unit, and the rest lightning arresters are configured inside the line unit according to the following modes:
the rest lightning arresters are arranged at positions which are at distances of d, 2d, … and kd from the tail end point of the line unit, wherein k is a natural number, d represents the span of the half-wavelength transmission line, and when m is an even number,
Figure BDA0001451794890000141
when m is an odd number, the number of the carbon atoms,
Figure BDA0001451794890000142
the second determining module determines the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage in the differential configuration strategy through an electromagnetic transient simulation model of the half-wavelength power transmission system under the condition of the maximum power transmission capacity of the half-wavelength power transmission line.
The determining module is specifically configured to determine the following power fluctuation limiting requirement:
1) the power fluctuation overvoltage of the transformer substation line side is not more than 1.4p.u., and the duration time of the power fluctuation overvoltage of the transformer substation line side is not more than 0.5 s;
2) the amplitude of the power fluctuation overvoltage of the half-wavelength power transmission line and the duration of the power fluctuation overvoltage of the half-wavelength power transmission line meet the temporary overvoltage tolerance of the lightning arrester;
3) the maximum absorption energy of the arrester along the half-wavelength power transmission line under the action of power fluctuation overvoltage meets the tolerance capability of the arrester for absorbing energy.
When the judging module meets the power fluctuation limiting requirement simultaneously under the action of the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategy, the differential configuration strategy is optimized according to the following processes:
firstly, the installation position of the lightning arrester on the half-wavelength transmission line is set to be L1,…,Lh,…,LHThe maximum absorption energy of the single-group lightning arrester is EhH is 1,2, …, H, H represents the total number of installation positions of the lightning arrester on the half-wavelength transmission line;
then the following two cases are distinguished:
if Eh＜0.5EMAnd the end point and the interior of the line unit are provided with at least two groups of lightning arresters, the differential configuration strategy is updated according to the principle that one group of lightning arresters is reduced from the head end of the line unit to the tail end of the line unit each time, the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arresters under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the updated differential configuration strategy are determined according to an electromagnetic transient simulation model of the half-wavelength power transmission system, and the power fluctuation overvoltage of the half-wavelength power transmission line in the updated differential configuration strategy are judgedWhether the maximum absorption energy of the arrester under the action of the duration and the power fluctuation overvoltage meets the power fluctuation limiting requirement or not at the same time, if so, taking the updated differential configuration strategy as a final arrester configuration strategy, otherwise, taking the differential configuration strategy before updating as a final arrester configuration strategy;
if 0.5EM≤Eh≤EMAnd the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and then the differential configuration strategy is used as a final arrester configuration strategy.
When the judgment module can not simultaneously meet the power fluctuation limiting requirement under the action of the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategy, the judgment module corrects the differential configuration strategy:
the terminal end point of the line unit and the installation position of the internal lightning arrester are set to be L1,…,Li,…,LNI is 1,2, …, N represents the total number of lightning arrester installation positions in the line unit, LiIndicates the ith mounting position;
then the following two cases are distinguished:
if LiClose to L1Then at L1And near the head end of the line unit and with L1Correcting the differential configuration strategy at the position with the distance d according to the principle of adding a group of lightning arresters at each time until the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arresters under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and taking the corrected differential configuration strategy as a final lightning arrester configuration strategy;
if LiClose to LNThen near the end of the half-wavelength transmission line and LNCorrecting differentiation at the position with the distance d according to the principle of adding one group of lightning arresters at a timeAnd configuring strategies until the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategies simultaneously meets the power fluctuation limiting requirement, and taking the corrected differential configuration strategy as a final arrester configuration strategy.
Example 2
The following explains the application of the half-wavelength alternating current transmission system power fluctuation overvoltage control method provided by the invention by taking a single-loop extra-high voltage half-wavelength transmission system as an example:
the wiring schematic diagram of a certain point-to-grid ultra-high voltage half-wavelength power transmission system is shown in fig. 3, wherein a transmitting end of the system adopts 10 600MW units to boost the voltage to 1000kV, and the transmitting end is connected to a receiving end system through a 3000km line erected in a single loop, and the receiving end is directly connected to a 1000kV power grid. The receiving end adopts a single machine infinite system, and the short-circuit capacity of the half-wavelength transmission line is 40kA before the half-wavelength transmission line is connected. The maximum transmission power is designed according to 5000 MW.
The approximate sequence parameters of the 1000kV single-circuit line are shown in table 1:
TABLE 1
Figure BDA0001451794890000151
Neglecting the line loss, the wave impedance of the extra-high voltage line can be obtained according to the table 1
Figure BDA0001451794890000152
The natural power at 1050kV is 4485MW (1p.u.), the wavelength is 5898km, and the exact half wavelength is 2949 km. In the research, the length of a half-wavelength AC line is set to be 3000km, and the length of each half-wavelength AC line is 30 sections, and each half-wavelength AC line is 100 km.
Rated voltage of a lightning arrester along the ultrahigh voltage half-wavelength power transmission system is 876kV, the requirement of the lightning arrester on bearing temporary overvoltage is shown in Table 2, and the energy absorption tolerance E of the lightning arresterMIs 42 MJ.
The method for controlling the power fluctuation overvoltage of the half-wavelength power transmission system provided by the embodiment 2 of the invention comprises the following specific processes:
step 1: determining the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in a uniform configuration strategy and a uniform configuration strategy of the arrester along the half-wavelength power transmission line:
step 1-1: when the extra-high voltage half-wavelength transmission line has a single-phase transient fault, high-amplitude power fluctuation exists on the half-wavelength transmission line, as shown in fig. 4. When the power fluctuation exceeds the natural power, overvoltage occurs along the half-wavelength power transmission line, and the overvoltage extreme point along the line is located in the middle section of the line, as shown in fig. 5. The overvoltage at the extreme point position is shown in fig. 6, the amplitude (per unit value) of the overvoltage is about the ratio of the power fluctuation to the natural power, and the overvoltage duration is consistent with the time of the power fluctuation. The overvoltage is the power fluctuation overvoltage defined by the invention. The power fluctuation overvoltage is characterized by the category of temporary overvoltage, high amplitude, long duration and wide coverage area along the line.
The single-phase instantaneous grounding fault is used as the power fluctuation overvoltage research fault condition of the half-wavelength power transmission line, and the single-phase instantaneous grounding process is divided into three stages, namely a fault process, a reclosing period and a system swinging process after reclosing is successful. Moment t of single-phase earth fault of half-wavelength power transmission line04s, and the tripping time of the fault phase breaker is tB1Is 4.125 s; reclosing time t of fault phase circuit breakerB2It was 5.025 s.
Step 1-2: the extra-high voltage half-wavelength transmission line is evenly divided into 30 line units with the fixed length of 100km, and 2 groups of lightning arresters are arranged at the end point of each line unit.
Step 1-3: the maximum absorption energy of the arrester under the uniform configuration strategy is determined according to the following process: under the condition that the maximum power transmission capacity of the extra-high voltage half-wavelength power transmission line is 5000MW, the maximum absorption energy of the lightning arrester under the action of power fluctuation overvoltage in the single-phase instantaneous ground fault process is determined by an electromagnetic transient simulation model of the half-wavelength power transmission system under the uniform configuration strategy, as shown in fig. 7.
Step 2: determining a differential configuration strategy of the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy:
step 2-1: the differentiated configuration strategy for determining the lightning arresters along the extra-high voltage half-wavelength power transmission line according to the maximum absorption energy of the lightning arresters comprises the following steps: the lightning arresters are arranged at the end points of each line unit and in the line units on the basis that the maximum absorption energy of a single group of lightning arresters does not exceed 80 percent of the energy absorption capacity of the lightning arresters and the maximum two groups of lightning arresters are arranged at the installation position of each lightning arrester. The line unit determines the installation number of the lightning arresters according to the following process:
the terminal end points and the interior of the line unit are provided with m groups of lightning arresters, and the maximum absorption energy of the lightning arresters under the action of power fluctuation overvoltage in the uniform configuration strategy is EUWhen E isU＜0.8EMWhen m is 1; when E isU≥0.8EMWhen m is ═ EU/0.8EM]，[]Denotes rounding off, where EMAnd the energy absorption endurance capacity of the lightning arrester. Therefore, the number of the lightning arresters required to be configured in each line unit along the extra-high voltage half-wavelength transmission line is obtained, wherein the number of the lightning arresters comprises the tail end point and the interior of the line unit, and as shown in fig. 8, the number of the lightning arresters is totally 93.
The line unit determines the terminal end point of the line unit and the installation position of the internal arrestor according to the following procedures:
when m is 1, a group of lightning arresters are installed at the tail end of the line unit;
when m is 2, two groups of lightning arresters are installed at the end points of the tail end of the line unit;
when m is more than or equal to 3, two groups of lightning arresters are installed at the end points of the line unit, and the rest lightning arresters are arranged in the line unit according to the following modes:
the rest lightning arresters are arranged at positions which are at distances of 400m, 800m, … and k multiplied by 400m from the tail end of the line unit, wherein k is a natural number, the span of the extra-high voltage half-wavelength transmission line is 400m, and when m is an even number,
Figure BDA0001451794890000171
when m is an odd number, the number of the carbon atoms,
Figure BDA0001451794890000172
the arrangement positions of the plural sets of lightning arresters will be described by taking the 10 th line unit (line unit 900km to 1000km from the head end of the line) and the 12 th line unit (line unit 1100km to 1200km from the head end of the line) as examples:
according to fig. 8, 8 groups of lightning arresters are required to be configured for the 10 th line unit, 2 groups of lightning arresters are installed at the end points of the line unit, and 6 groups are required to be installed inside the line. The line interior 6 groups of arresters were arranged at positions at distances of 400m, 800m and 1200m from the end points of the line units, as shown in fig. 9.
As shown in fig. 9, 7 groups of lightning arresters are required to be configured for the 12 th line unit, 2 groups of lightning arresters are installed at the end points of the line unit, and 5 groups of lightning arresters are required to be installed inside the line. The line interior 5 groups of arresters are arranged at positions at distances of 400m, 800m and 1200m from the end points of the line units, as shown in fig. 10.
Step 2-2: under the condition that the maximum power transmission capacity of the extra-high voltage half-wavelength power transmission line is 5000MW, determining the power fluctuation overvoltage, the power fluctuation overvoltage duration and the maximum absorption energy of a lightning arrester of the half-wavelength power transmission line under a differential configuration strategy through an electromagnetic transient simulation model of the half-wavelength power transmission system: the maximum amplitude of the power fluctuation overvoltage along the line is 1.56pu, and the overvoltage duration time of 1.5-1.56 pu is 1.15s, as shown in fig. 11; the maximum absorption energy distribution of the extra-high voltage half-wavelength line arrester (single group) is shown in figure 12.
And 3, step 3: judging whether the power fluctuation overvoltage, the power fluctuation overvoltage duration and the maximum absorption energy of the lightning arrester of the half-wavelength power transmission line under the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, if so, optimizing the differential configuration strategy, otherwise, correcting the differential configuration strategy:
step 3-1: determining the following power fluctuation limiting requirements of the half-wavelength power transmission system:
1) the power fluctuation overvoltage of the ultra-high voltage transformer substation line side is not more than 1.4p.u., and the duration time of the power fluctuation overvoltage of the transformer substation line side is not more than 0.5 s;
2) the power fluctuation overvoltage amplitude of the half-wavelength power transmission line and the duration of the power fluctuation overvoltage of the half-wavelength power transmission line both meet the temporary overvoltage tolerance performance of the lightning arrester, and are specifically shown in table 2:
TABLE 2
Figure BDA0001451794890000181
3) The maximum absorption energy of the arrester along the half-wavelength power transmission line under the action of power fluctuation overvoltage meets the tolerance capability of the arrester for absorbing energy.
Step 3-2: and optimizing a differentiated configuration strategy:
the installation position of the lightning arrester on the extra-high voltage half-wavelength transmission line is set to be L1,…,Lh,…,LH，LhThe maximum absorption energy of the single group of lightning arresters is EhAnd H is 1,2, …, H and H represents the total number of the installation positions of the lightning arrester on the half-wavelength transmission line.
According to fig. 12, the arresters of line units 14, 15 and 16 have maximum absorbed energy less than 21MJ (0.5EM), and the ends and the interior share at least two groups of arresters; the maximum absorption energy of the lightning arresters of other line units meets 0.5EM≤Eh≤EMAnd the power fluctuation overvoltage duration meet the power fluctuation limiting requirement. Therefore, the configuration number of the lightning arresters of the 14 th, 15 th and 16 th line units in the differential configuration strategy is updated according to the principle that a group of lightning arresters is reduced from the head end of the line unit to the tail end of the line unit. And determining the power fluctuation overvoltage, the power fluctuation overvoltage duration and the maximum absorption energy of the lightning arrester of the half-wavelength power transmission line under the updated differential configuration strategy according to an electromagnetic transient simulation model of the half-wavelength power transmission system: the maximum amplitude of the power fluctuation overvoltage along the line is 1.56pu, and the overvoltage duration of 1.5-1.56 pu is 1.15s, as shown in fig. 13; extra-high voltage half-wavelength line arrester (Single)Group) maximum absorbed energy distribution is shown in fig. 14. The above results can meet the power fluctuation limitation requirements, so that the updated differentiated configuration strategy is used as the final arrester configuration strategy. And 90 groups of lightning arresters are required to be configured on the extra-high voltage half-wavelength transmission line.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.

Claims (16)

1. A control method for half-wavelength transmission line power fluctuation overvoltage is characterized by comprising the following steps:
determining the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in a uniform configuration strategy and a uniform configuration strategy of the arrester along the half-wavelength power transmission line;
determining a differential configuration strategy of the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy;
judging whether the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, if so, optimizing the differential configuration strategy, and otherwise, correcting the differential configuration strategy;
the power fluctuation overvoltage of the half-wavelength power transmission line comprises overvoltage which occurs on the half-wavelength power transmission line when power fluctuation generated under the condition that the half-wavelength power transmission line has a fault exceeds natural power;
the amplitude of the power fluctuation overvoltage is proportional to the ratio of the power fluctuation to the natural power of the half-wavelength power transmission line;
the duration of the power fluctuation overvoltage is consistent with the power fluctuation time of the half-wavelength power transmission line;
if the fault is a single-phase instantaneous earth fault, the fault process of the single-phase instantaneous earth fault comprises a fault period process, a reclosing process and a swinging process;
the uniform configuration strategy of the arrester along the half-wavelength power transmission line is determined according to the following processes:
uniformly dividing the half-wavelength power transmission line into a plurality of line units in a fixed length, and installing the same group number of lightning arresters at the end point of each line unit;
the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in the uniform configuration strategy is determined according to the following process:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, determining the maximum absorption energy of the lightning arrester under the action of power fluctuation overvoltage in a uniform configuration strategy through an electromagnetic transient simulation model of the half-wavelength power transmission system;
the differential configuration strategy for determining the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in the uniform configuration strategy comprises the following steps:
the lightning arresters are arranged at the tail end points and the interior of each line unit on the principle that the maximum absorption energy of a single group of lightning arresters does not exceed 80% of the energy absorption capacity of the lightning arresters, at most two groups of lightning arresters are arranged at each lightning arrester installation position, and the lightning arresters are preferentially arranged at the tail ends of the line units.
2. The method of controlling power fluctuation overvoltage of a half-wavelength power transmission line according to claim 1, wherein the terminal end point of the line unit and the internally installed lightning arrester include:
determining the number of terminal ends of the line units and the number of installations of the internal arresters, comprising:
the terminal end points and the interior of the line unit are provided with m groups of lightning arresters, and the maximum absorption energy of the lightning arresters under the action of power fluctuation overvoltage in a uniform configuration strategy is EUWhen E isU＜0.8EMWhen m is 1; when E isU≥0.8EMWhen m is ═ EU/0.8EM]，[]Denotes rounding off, where EMThe ability to withstand the energy absorbed by the arrester;
determining the terminal end point of the line unit and the installation position of the internal arrester, including:
when m is 1, a group of lightning arresters are installed at the tail end of the line unit;
when m is 2, two groups of lightning arresters are installed at the end points of the tail end of the line unit;
when m is more than or equal to 3, two groups of lightning arresters are installed at the end points of the line unit, and the rest lightning arresters are arranged in the line unit according to the following modes:
the rest lightning arresters are arranged at positions which are at distances of d, 2d, … and kd from the tail end of the line unit, wherein k is a natural number, d represents the span of the half-wavelength transmission line, and when m is an even number,
Figure FDA0003564584100000021
when m is an odd number, the number of the carbon atoms,
Figure FDA0003564584100000022
3. the method for controlling the power fluctuation overvoltage of the half-wavelength power transmission line according to claim 2, wherein the determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategy comprises:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage in a differential configuration strategy through an electromagnetic transient simulation model of the half-wavelength power transmission system.
4. The method for controlling the power fluctuation overvoltage of the half-wavelength power transmission line according to claim 3, wherein the power fluctuation limitation requirement includes:
1) the power fluctuation overvoltage of the transformer substation line side is not more than 1.4p.u., and the duration time of the power fluctuation overvoltage of the transformer substation line side is not more than 0.5 s;
2) the amplitude of the power fluctuation overvoltage of the half-wavelength power transmission line and the duration of the power fluctuation overvoltage of the half-wavelength power transmission line meet the temporary overvoltage tolerance of the lightning arrester;
3) the maximum absorption energy of the arrester along the half-wavelength power transmission line under the action of power fluctuation overvoltage meets the tolerance capability of the arrester for absorbing energy.
5. The method of claim 4, wherein the optimizing the differential configuration strategy comprises:
the installation position of the lightning arrester on the half-wavelength transmission line is set to be L1,…,Lh,…,LHThe maximum absorption energy of the single-group lightning arrester is EhH is 1,2, …, H, H represents the total number of installation positions of the lightning arrester on the half-wavelength transmission line;
if Eh＜0.5EMAnd the end point and the interior of the line unit are provided with at least two groups of lightning arresters, the differential configuration strategy is updated according to the principle that one group of lightning arresters is reduced from the head end of the line unit to the tail end of the line unit each time, the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arresters under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the updated differential configuration strategy are determined according to an electromagnetic transient simulation model of the half-wavelength power transmission system, and the updated maximum absorption energy of the lightning arresters under the action of the half-wavelength power fluctuation overvoltage in the differential configuration strategy is judgedWhether the power fluctuation overvoltage, the duration time of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage of the long power transmission line meet the power fluctuation limiting requirement or not simultaneously, if so, taking the updated differential configuration strategy as a final lightning arrester configuration strategy, and otherwise, taking the differential configuration strategy before updating as a final lightning arrester configuration strategy;
if 0.5EM≤Eh≤EMAnd the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and then the differential configuration strategy is used as a final arrester configuration strategy.
6. The method for controlling the power fluctuation overvoltage of the half-wavelength power transmission line according to claim 4, wherein the correcting the differential configuration strategy comprises:
setting the terminal end point of the line unit and the installation position of the internal lightning arrester as L1,…,Li,…,LNI is 1,2, …, N represents the total number of lightning arrester installation positions in the line unit, LiIndicates the ith mounting position;
if L isiClose to L1Then at L1And near the head end of the line unit and with L1Correcting the differentiated configuration strategy at the position with the distance d according to the principle of adding a group of lightning arresters at each time until the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arresters under the action of the power fluctuation overvoltage in the differentiated configuration strategy simultaneously meet the power fluctuation limiting requirement, and taking the corrected differentiated configuration strategy as a final lightning arrester configuration strategy;
if L isiClose to LNThen near the end of the half-wavelength transmission line and LNAnd correcting the differential configuration strategy at the position with the distance d according to the principle of adding a group of lightning arresters at each time until the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategyThe duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage meet the power fluctuation limiting requirement at the same time, and the corrected differential configuration strategy is used as a final arrester configuration strategy.
7. A control device for power fluctuation overvoltage of a half-wavelength power transmission line is characterized by comprising:
the first determining module is used for determining the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in a uniform configuration strategy and a uniform configuration strategy of the arrester along the half-wavelength power transmission line;
the second determination module is used for determining a differential configuration strategy of the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the uniform configuration strategy, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differential configuration strategy;
the judging module is used for judging whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage meet the power fluctuation limiting requirement or not in the differential configuration strategy, if so, the differential configuration strategy is optimized, and otherwise, the differential configuration strategy is corrected;
the uniform configuration strategy of the arrester along the half-wavelength power transmission line is determined according to the following processes:
uniformly dividing the half-wavelength power transmission line into a plurality of line units in a fixed length, and installing the same group number of lightning arresters at the end point of each line unit;
the differential configuration strategy for determining the arrester along the half-wavelength power transmission line according to the maximum absorption energy of the arrester under the action of power fluctuation overvoltage in the uniform configuration strategy comprises the following steps:
the lightning arresters are arranged at the tail end points and the interior of each line unit on the principle that the maximum absorption energy of a single group of lightning arresters does not exceed 80% of the energy absorption capacity of the lightning arresters, at most two groups of lightning arresters are arranged at each lightning arrester installation position, and the lightning arresters are preferentially arranged at the tail ends of the line units.
8. The apparatus of claim 7, wherein the power fluctuation overvoltage of the half-wavelength power transmission line comprises an overvoltage occurring on the half-wavelength power transmission line when a power fluctuation generated in the event of a fault on the half-wavelength power transmission line exceeds a natural power;
the amplitude of the power fluctuation overvoltage is proportional to the ratio of the power fluctuation to the natural power of the half-wavelength power transmission line;
the duration of the power fluctuation overvoltage is consistent with the power fluctuation time of the half-wavelength power transmission line;
if the fault is a single-phase instantaneous earth fault, the fault process of the single-phase instantaneous earth fault comprises a fault period process, a reclosing process and a swinging process.
9. The apparatus for controlling the power fluctuation overvoltage of the half-wavelength power transmission line according to claim 8, wherein the first determining module is specifically configured to:
the half-wavelength transmission line is evenly divided into a plurality of line units in a fixed length, and the same groups of lightning arresters are arranged at the end points of each line unit.
10. The apparatus for controlling the power fluctuation overvoltage of the half-wavelength power transmission line according to claim 9, wherein the first determining module is specifically configured to:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, the maximum absorption energy of the lightning arrester under the action of power fluctuation overvoltage in the uniform configuration strategy is determined through an electromagnetic transient simulation model of the half-wavelength power transmission system.
11. The apparatus for controlling the power fluctuation overvoltage of the half-wavelength power transmission line according to claim 10, wherein the second determining module is specifically configured to:
the lightning arresters are arranged at the tail end points and the interior of each line unit on the principle that the maximum absorption energy of a single group of lightning arresters does not exceed 80% of the energy absorption capacity of the lightning arresters, at most two groups of lightning arresters are arranged at each lightning arrester installation position, and the lightning arresters are preferentially arranged at the tail ends of the line units.
12. The apparatus for controlling the power fluctuation overvoltage of the half-wavelength power transmission line according to claim 11, wherein the second determining module is specifically configured to:
determining the number of terminal ends of the line units and the number of installations of the internal arresters, comprising:
the terminal end points and the interior of the line unit are provided with m groups of lightning arresters, and the maximum absorption energy of the lightning arresters under the action of power fluctuation overvoltage in a uniform configuration strategy is EUWhen E isU＜0.8EMWhen m is 1; when E isU≥0.8EMWhen m is ═ EU/0.8EM]，[]Denotes rounding off, where EMThe ability to withstand the energy absorbed by the arrester;
determining the terminal end point of the line unit and the installation position of the internal arrester, including:
when m is equal to 1, a group of lightning arresters are installed at the tail end of the line unit;
when m is 2, two groups of lightning arresters are installed at the end points of the tail end of the line unit;
when m is more than or equal to 3, two groups of lightning arresters are installed at the end points of the line unit, and the rest lightning arresters are arranged in the line unit according to the following modes:
the rest lightning arresters are arranged at positions which are at distances of d, 2d, … and kd from the tail end of the line unit, wherein k is a natural number, d represents the span of the half-wavelength transmission line, and when m is an even number,
Figure FDA0003564584100000061
when m is an odd number, the number of the carbon atoms,
Figure FDA0003564584100000062
13. the apparatus for controlling the power fluctuation overvoltage of the half-wavelength power transmission line according to claim 12, wherein the second determining module is specifically configured to:
under the condition of the maximum power transmission capacity of the half-wavelength power transmission line, determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in a differential configuration strategy through an electromagnetic transient simulation model of the half-wavelength power transmission system.
14. The apparatus for controlling power fluctuation overvoltage of a half-wavelength power transmission line according to claim 13, wherein the determining module is specifically configured to determine the following power fluctuation limiting requirements:
1) the power fluctuation overvoltage of the transformer substation line side is not more than 1.4p.u., and the duration time of the power fluctuation overvoltage of the transformer substation line side is not more than 0.5 s;
2) the amplitude of the power fluctuation overvoltage of the half-wavelength power transmission line and the duration of the power fluctuation overvoltage of the half-wavelength power transmission line meet the temporary overvoltage tolerance of the lightning arrester;
3) the maximum absorption energy of the arrester along the half-wavelength power transmission line under the action of power fluctuation overvoltage meets the tolerance capability of the arrester for absorbing energy.
15. The apparatus for controlling power fluctuation overvoltage of a half-wavelength power transmission line according to claim 14, wherein the determining module optimizes the differentiated configuration strategy according to the following procedures:
the installation position of the lightning arrester on the half-wavelength transmission line is set to be L1,…,Lh,…,LHThe maximum absorption energy of the single-group lightning arrester is EhH is 1,2, …, H, H represents the total number of installation positions of the lightning arrester on the half-wavelength transmission line;
if Eh＜0.5EMAnd the terminal and the interior of the circuit unitAt least two groups of lightning arresters are shared, the differential configuration strategy is updated according to the principle that one group of lightning arresters is reduced from the head end of the line unit to the tail end of the line unit each time, and determining the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage of the half-wavelength power transmission line in the updated differential configuration strategy according to an electromagnetic transient simulation model of the half-wavelength power transmission system, judging whether the power fluctuation overvoltage, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the updated differential configuration strategy simultaneously meet the power fluctuation limiting requirement, if so, taking the updated differential configuration strategy as a final arrester configuration strategy, and otherwise, taking the differential configuration strategy before updating as a final arrester configuration strategy;
if 0.5EM≤Eh≤EMAnd the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the arrester under the action of the power fluctuation overvoltage in the differentiated configuration strategy simultaneously meet the power fluctuation limitation requirement, and then the differentiated configuration strategy is used as a final arrester configuration strategy.
16. The device for controlling the power fluctuation overvoltage of the half-wavelength power transmission line according to claim 14, wherein the judging module corrects the differentiated configuration strategy according to the following process:
the terminal end point of the line unit and the installation position of the internal lightning arrester are set to be L1,…,Li,…,LNI is 1,2, …, N represents the total number of lightning arrester installation positions in the line unit, LiIndicates the ith mounting position;
if L isiClose to L1Then at L1And near the head end of the line unit and with L1And correcting the differential configuration strategy at the position with the distance d according to the principle of adding a group of lightning arresters at each time until the power fluctuation overvoltage of the half-wavelength power transmission line in the differential configuration strategy, the duration time of the power fluctuation overvoltage and the sum of the power fluctuation overvoltageThe maximum absorption energy of the arrester under the action of power fluctuation overvoltage meets the power fluctuation limiting requirement at the same time, and the corrected differential configuration strategy is used as a final arrester configuration strategy;
if L isiClose to LNThen near the end of the half-wavelength transmission line and with LNAnd (d) correcting the differential configuration strategy at the position with the distance d according to the principle of adding a group of lightning arresters at each time until the power fluctuation overvoltage of the half-wavelength power transmission line, the duration of the power fluctuation overvoltage and the maximum absorption energy of the lightning arresters under the action of the power fluctuation overvoltage in the differential configuration strategy simultaneously meet the power fluctuation limiting requirement, and taking the corrected differential configuration strategy as the final lightning arrester configuration strategy.
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CN107132409A (en) * 2017-02-23 2017-09-05 中国电力科学研究院 A kind of determination method and apparatus of half-wave power transmission line steady-state voltage limits

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CN106130021A (en) * 2016-06-23 2016-11-16 全球能源互联网研究院 A kind of flexible tuner of T-shaped mixing
CN106597148A (en) * 2016-11-24 2017-04-26 云南电网有限责任公司电力科学研究院 Residual voltage monitoring based state monitoring system and method for lightning arrester without serial gap
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