CN103490408A - Collaborative modulation method based on power grid multi-circuit direct current - Google Patents

Collaborative modulation method based on power grid multi-circuit direct current Download PDF

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Publication number
CN103490408A
CN103490408A CN201310444497.1A CN201310444497A CN103490408A CN 103490408 A CN103490408 A CN 103490408A CN 201310444497 A CN201310444497 A CN 201310444497A CN 103490408 A CN103490408 A CN 103490408A
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CN
China
Prior art keywords
direct current
modulation
line
fault
locking
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Pending
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CN201310444497.1A
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Chinese (zh)
Inventor
吴琛
王新宝
李玲芳
张玉琼
张丹
付俊波
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YUNNAN ELECTRIC POWER DISPATCH CONTROL CENTER
NR Electric Co Ltd
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YUNNAN ELECTRIC POWER DISPATCH CONTROL CENTER
NR Electric Co Ltd
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Priority to CN201310444497.1A priority Critical patent/CN103490408A/en
Publication of CN103490408A publication Critical patent/CN103490408A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a collaborative modulation method based on power grid multi-circuit direct current. The collaborative modulation method based on the power grid multi-circuit direct current comprises the steps of (1) a power value of real-time transmission of a direct current line of each circuit is obtained to obtain the power, capable of being modulated in a real-time mode, of the direct current, (2) the modulation mode adopted by additional control of the direct current is learned about, (3) whether a fault is a monopole locking fault or a multipole locking fault is judged when the fault occurs in the direct current line of some circuit, (4) direct current modulation is not started to be used by the direct current of any one of multiple circuits when the fault is determined to be the monopole locking fault, (5) the obtained modulation mode is started to be used by other poles, in normal operation, of the direct current when a double-pole locking fault occurs on a four-pole operation direct current line, and (6) active power modulation of the direct current is rapidly started to be used by other two paths of direct current when the situation that the double-pole locking fault occurs on some double-pole operation direct current line, or a three-pole or four-pole direct current locking fault occurs on the four-pole operation direct current line is determined, and the total direct current delivery power of the multi-circuit direct current is increased to the maximum extent. The collaborative modulation method based on the power grid multi-circuit direct current needs to be developed in advance through an off-line simulation strategy, the frequency of generator tripping of a safety stability device can be reduced, and the overall economic benefit of operation of a power grid can be improved.

Description

A kind of method based on the collaborative modulation of many times direct currents of electrical network
Technical field
The invention belongs to the power system operation control field, particularly after a kind of DC system fault, between many times direct current systems, work in coordination with the problem of modulating.
Background technology
According to State Grid's industry " 12 ", plan, during this period, to there be a large amount of superhigh pressure, UHVDC Transmission Lines to carry out construction, State Grid Corporation of China's 15 (containing 13 times ± 800 kilovolts and 1 time ± 1100 kilovolts) DC engineering that are about to go into operation only, 2.3 hundred million kilowatts of total change of current capacity, 2.5 ten thousand kilometers of total track lengths.Electric power is sent to the rare area of electric power endlessly from the area of energy abundance.From the National energy distribution structure, the water power of high-quality, thermoelectricity resource mainly are distributed in the areas such as Yunnan, Sichuan, Xinjiang.And energy wilderness demand district mainly concentrates on the Yangtze River Delta, area, Pearl River Delta.This just makes and may occur that many times direct currents are sent to the situation in another electricity needs district from an area simultaneously, and as by 2015, Guangdong will be sent to by three times direct current conveying circuits (Chu Sui direct current, glutinous bundle cross direct current, direct current is crossed in the small stream Lip river) in Yunnan simultaneously.Will there be many times DC power transmission line, multiple dragon-Fengxian direct current, silk screen-southern Jiangsu direct current in Sichuan) situation of operation.
Although DC transmission system has plurality of advantages, also there are some problems in AC system relatively, as direct current system does not have the participation of electric rotating machine, so has also lost the characteristics of Modulating Power voluntarily.From AC system, DC converter station is one can produce adverse influence to the insensitive load of frequency to the stable of system, even causes the negative damping of system, and this shows more obvious in the AC/DC parallel system.For purer AC system passage, because direct current power is insensitive to frequency response, the power rush caused after transient fault is not had to cushioning effect, no matter be the short trouble of AC system side, or the locking fault of DC line, all can bring larger fault to impact to AC system.In the transmission system of weak interchange strong dc, the consequence that this impact causes is more serious, often after the multipole locking fault of direct current system occurring, system needs a large amount of machines of cutting, and excises its supporting power supply, because the capacity of the supporting power supply of direct current system is all larger, the rated capacity of single unit is all more than 600MW, if therefore after fault, can take some measure, cut less machine on the basis that guarantees system safety stable operation, will bring great economic benefit to electrical network.
Conventional HVDC (High Voltage Direct Current) transmission system has the long-term overload capacity of 1.1 times and 1.5 times of short-time overload capacities of 3s, can be larger for supporting D.C. capacity, at AC and DC, suffer in the catastrophe failure situation, utilize the short-time overload capacity of high voltage direct current, can make up the unbalanced power amount of sending end and receiving end in transient process, the Transient angle stability of raising system, correspondingly also can improve the voltage fluctuation and the long phenomenon of low-voltage duration that cause due to power imbalances.
The research major control mode of the current overload capacity to direct current adopts additional control mode, relatively common are: the bilateral frequency difference is controlled and the modulation of direct current active power, no matter be which kind of control mode, the main difference existed is in the selection of input variable, final purpose is all the transmission quantity size that changes direct current power, at present the HVDC supplementary control mode mainly is confined to the impact on AC system of single time DC line, the perhaps comparison of different direct current additional modulation modes, and the research aspect the many times collaborative modulation of DC line is very few.
Study the many times collaborative modulation between direct current, after certain time serious multipole locking fault occurs in direct current, other two direct currents are enabled additional control (modulation of bilateral frequency difference or the modulation of direct current active power) Emergency Assistance are provided, reaching the machine of the cutting amount that maintains system stability, reduces stability control equipment, the purpose that improves whole economic efficiency is necessary especially.
In view of above analysis, the present invention launches research by the problem that many times direct currents of electrical network are moved simultaneously, proposes a kind of method based on the collaborative modulation of many times direct currents of electrical network.
Summary of the invention
Purpose of the present invention, be to provide a kind of method based on the collaborative modulation of many times direct currents of electrical network, and it can reduce the machine of the cutting amount of stability control equipment, improves the whole economic efficiency of operation of power networks.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of method based on the collaborative modulation of many times direct currents of electrical network, comprise the steps:
(1) obtain the real-time performance number of carrying of DC line every time, the requirement according to direct current design overload capacity, draw the watt level that direct current can be modulated in real time;
(2) requirement of building according to DC engineering, show which kind of modulation system the additional control of direct current adopts;
(3) between many times direct currents, establish a communications link, when certain time DC line breaks down, at first judgement is one pole locking fault or multipole locking fault, goes to step respectively (4) and step (5);
(4) if be judged as one pole locking fault, many times direct currents are not all enabled HVDC Modulation; If four utmost point operation DC line generation bipolar locking faults, enable by other normal operation utmost point of this direct current the modulation system that abovementioned steps (2) obtains, the HVDC Modulation amount is not more than the machine of the cutting amount of stability control equipment while not enabling additional modulation;
(5) if be judged as certain bipolar operation DC line generation bipolar locking fault or four utmost points operation DC line, three utmost points or four utmost point direct current locking faults occur, the information that other two direct currents pass over according to communication main station and the strategy that off-line is formulated in advance, enable rapidly the modulation of direct current active power, increase the many times total direct currents of direct current as far as possible and send power outside.
In above-mentioned steps (2), the additional control of direct current selects to adopt the modulation of bilateral frequency difference or the modulation of direct current active power.
In above-mentioned steps (3), when certain time DC line breaks down, signal being passed to other DC control point, is one pole locking fault or multipole locking fault by other DC control point judgement, thereby determines whether to take the HVDC Modulation action.
The detailed content of above-mentioned steps (5) is:
(51) after multipole locking fault occurs certain time DC line, other DC line starts modulation, promotes transmission power; Whether the modulation that judges other DC line cuts the machine amount to minimizing produces effect, if to no effect, and this DC line modulation function of locking; If the HVDC Modulation of other DC line produces effect, enable at once, increase transmission power to maximum;
(52) simultaneously, fault DC line stability control equipment is cut motor-driven work, and off-line simulation draws cuts the machine amount, writes the Off-line control Policy Table.
After adopting such scheme, when the present invention moves at many times direct currents of research simultaneously, after certain time multipole locking fault occurs in direct current, to other each back production cut-off stream modulation means, thereby reduce the machine of the cutting amount of stability control equipment, maintain system safety stable operation after fault, be applicable to the extensive Energy Base of Future in China and adopt the planning that many times DC line are carried the energy.
The accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is the flow chart of the many times collaborative modulator control signal transmission of direct current in the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is elaborated.
As shown in Figure 1, the invention provides a kind of method based on the collaborative modulation of many times direct currents of electrical network, comprise the steps:
(1) obtain the real-time performance number of carrying of DC line every time, the requirement according to direct current design overload capacity, draw the watt level that direct current can be modulated in real time;
In general, direct current has 1.5 times of short-time overload capacities and the 1.1 times of long-term overload capacity of 3s, once so direct current put into operation, its overload capacity is just fixing, but the power Real-time Collection of DC operation, thereby but can calculate the power of every DC line fast modulation.
(2) requirement of building according to DC engineering, show which kind of modulation system the additional control of direct current adopts;
When DC engineering is built, controlling and auxiliary control on design function has multiple additional modulation to select, usually selecting more is the modulation of bilateral frequency difference and the modulation of direct current active power, and two kinds of modulation means are all to control final direct current power to transmit numerical value.
(3) between many times direct currents, establish a communications link, when certain time DC line breaks down, at first judgement is one pole locking fault or multipole locking fault;
The prerequisite of the many times collaborative modulation of direct current is to set up each other communication, when a certain time direct current generation locking fault wherein, signal need to be passed to other DC control point, other direct current judgement is one pole locking fault or multipole locking fault, to determine whether the taking HVDC Modulation action.
(4) if be judged as one pole locking fault, many times direct currents are not all enabled HVDC Modulation; If four utmost point operation DC line generation bipolar locking faults, by other normal operation utmost point of this direct current, enable the modulation system that abovementioned steps (2) draws, as the modulation of bilateral frequency difference or the modulation of direct current active power, the HVDC Modulation amount is not more than the machine of the cutting amount of stability control equipment while not enabling additional modulation;
For direct current one pole locking fault, the system of it is generally acknowledged does not need to take measures, if four utmost point operation DC line generation bipolar locking faults need to be carried out simulation analysis to fault, in advance to determine the modulation power size on normal operation polar curve road in simulation model.
(5) if be judged as certain bipolar operation DC line generation bipolar locking fault or four utmost points operation DC line, three utmost points or four utmost point direct current locking faults occur, the information that other two direct currents pass over according to communication main station and the strategy that off-line is formulated in advance, enable rapidly the modulation of direct current active power, increase the many times total direct currents of direct current as far as possible and send power outside.The detailed content of this step is:
(51) after multipole locking fault occurs certain time DC line, other DC line starts modulation, promotes transmission power.Because of grid structure difference of living in, need judge whether the modulation of other DC line is cut the machine amount to minimizing and produced effect, if to no effect, and this DC line modulation function of locking; If the HVDC Modulation of other DC line produces effect, enable at once, increase transmission power to maximum;
(52) simultaneous faults DC line stability control equipment is cut motor-driven work, and off-line simulation draws cuts the machine amount, writes the Off-line control Policy Table.Participation because of other DC line modulation, can reach the effect of cutting less machine.
After three utmost points, four utmost point direct current locking faults occur in bipolar operation DC line generation bipolar locking fault or four utmost points operation DC line, a large amount of power transfer is arranged, and now the DC line of other normal operation receives the strategy startup HVDC Modulation of formulating according to off-line after this signal.The strategy that off-line is worked out is mainly according to obtaining by the off-line simulation means, and the power of HVDC Modulation can make by simulation means in advance for the moment how many and that enable HVDC Modulation.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposed according to the present invention, and any change of doing on the technical scheme basis, within all falling into protection range of the present invention.

Claims (4)

1. the method based on the collaborative modulation of many times direct currents of electrical network, is characterized in that comprising the steps:
(1) obtain the real-time performance number of carrying of DC line every time, the requirement according to direct current design overload capacity, draw the watt level that direct current can be modulated in real time;
(2) requirement of building according to DC engineering, show which kind of modulation system the additional control of direct current adopts;
(3) between many times direct currents, establish a communications link, when certain time DC line breaks down, at first judgement is one pole locking fault or multipole locking fault, goes to step respectively (4) and step (5);
(4) if be judged as one pole locking fault, many times direct currents are not all enabled HVDC Modulation; If four utmost point operation DC line generation bipolar locking faults, enable by other normal operation utmost point of this direct current the modulation system that abovementioned steps (2) obtains, the HVDC Modulation amount is not more than the machine of the cutting amount of stability control equipment while not enabling additional modulation;
(5) if be judged as certain bipolar operation DC line generation bipolar locking fault or four utmost points operation DC line, three utmost points or four utmost point direct current locking faults occur, the information that other two direct currents pass over according to communication main station and the strategy that off-line is formulated in advance, enable rapidly the modulation of direct current active power, increase the many times total direct currents of direct current as far as possible and send power outside.
2. as claimed in claim 1 a kind of based on the collaborative method of modulating of many times direct currents of electrical network, it is characterized in that: in described step (2), the additional control of direct current selects to adopt the modulation of bilateral frequency difference or the modulation of direct current active power.
3. as claimed in claim 1 a kind of based on the collaborative method of modulating of many times direct currents of electrical network, it is characterized in that: in described step (3), when certain time DC line breaks down, signal is passed to other DC control point, be one pole locking fault or multipole locking fault by other DC control point judgement, thereby determine whether to take the HVDC Modulation action.
4. as claimed in claim 1 a kind of based on the collaborative method of modulating of many times direct currents of electrical network, it is characterized in that the detailed content of described step (5) is:
(51) after multipole locking fault occurs certain time DC line, other DC line starts modulation, promotes transmission power; Whether the modulation that judges other DC line cuts the machine amount to minimizing produces effect, if to no effect, and this DC line modulation function of locking; If the HVDC Modulation of other DC line produces effect, enable at once, increase transmission power to maximum;
(52) simultaneously, fault DC line stability control equipment is cut motor-driven work, and off-line simulation draws cuts the machine amount, writes the Off-line control Policy Table.
CN201310444497.1A 2013-09-26 2013-09-26 Collaborative modulation method based on power grid multi-circuit direct current Pending CN103490408A (en)

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CN103956727A (en) * 2014-06-03 2014-07-30 南京南瑞继保电气有限公司 Modulated power distribution method with auxiliary direct current control function
CN111654040A (en) * 2020-06-17 2020-09-11 浙江大学 Frequency supporting method of interconnected power system containing HVDC (high voltage direct current) with consideration of support of transmitting end and receiving end

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Cited By (3)

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CN103956727A (en) * 2014-06-03 2014-07-30 南京南瑞继保电气有限公司 Modulated power distribution method with auxiliary direct current control function
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CN111654040A (en) * 2020-06-17 2020-09-11 浙江大学 Frequency supporting method of interconnected power system containing HVDC (high voltage direct current) with consideration of support of transmitting end and receiving end

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Application publication date: 20140101