CN103560547A - Method for processing alternating current system failures in alternating current and direct current electric transmission line - Google Patents
Method for processing alternating current system failures in alternating current and direct current electric transmission line Download PDFInfo
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- CN103560547A CN103560547A CN201310524748.7A CN201310524748A CN103560547A CN 103560547 A CN103560547 A CN 103560547A CN 201310524748 A CN201310524748 A CN 201310524748A CN 103560547 A CN103560547 A CN 103560547A
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Abstract
The invention discloses a method for processing alternating current system failures in an alternating current and direct current electric transmission line. The method comprises the steps of obtaining actual operation data of a power grid; according to overload capacity designed for direct currents, confirming power value, capable of being instantly increased or reduced, of a direct current system, and designing the transmission function controlled by direct current emergency power; obtaining the generator tripping value needed when the direct current emergency power is adopted to control conditions under failures of an alternating current system through an offline computing mode, pushing out action effect of the direct current emergency power control on the alternating current system failures, and making an offline control strategy; when the alternating current system failures occur, judging whether to adopt the direct current emergency power control according to the strategy, and safely and stably controlling the device to adopt generator tripping or load tripping measures according to the strategy. According to the method, the direct current emergency power control and the safe and stable control strategy are combined, a direct current emergency power control method is adopted to reduce total generator tripping value after the alternating current system failures occur, and overall economic benefits of power grid operation is improved.
Description
Technical field
The invention belongs to power system operation control field, the safety and stability that specially refers to the transmission of electricity of alternating current-direct current combined hybrid system is controlled the matching problem of controlling with the urgent power of direct current.
Background technology
The HVDC Transmission Technology of voltage levels, long distance is the effective way that solves China's primary energy and load skewness weighing apparatus contradiction, the coming years, China was by a series of superhigh pressure of Large scale construction, extra-high voltage direct-current transmission engineering to alleviate imbalance between power supply and demand, in the electric network composition in a plurality of province and district of AC/DC Hybrid Transmission System Jiang China district, existed.
DC transmission system, under control system regulating action, has active power regulation ability fast, sufficiently and reasonably utilizes this function, can improve large disturbance Transient Stability Level, improves disturbed rear dynamic recovery characteristics.At many direct currents, concentrate and to send or the electrical network of feed-in, main grid structure planning is except considering the factors such as fail safe, reliability, also needs to further consider between many times direct currents and between alternating current-direct current the trend emergency DC power support ability of transhipment flexibly.
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, in AC system, suffer in 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, also can improve voltage fluctuation and the long phenomenon of low-voltage duration causing due to power imbalances accordingly.
" a kind of alternating current-direct current control method for coordinating based on direct current power emergency control " of China's patent application numbers 201210088791.9, the method is mainly concerned with the power optimization distribution of AC/DC transmission line and controls principle, does not propose not utilize the coordinated scheme that the urgent power of direct current is controlled and safety and stability is controlled.
" the rack optimization method that adapts to direct current emergency DC power support " of China's patent application numbers 201210444402.1, the method is mainly the problem from using the angle analysis grid structure of many direct currents emergency DC power support to optimize, and about the urgent power of direct current, controls the problem that affects aspect of fault in ac transmission system is not related to.
In view of above analysis, by the problem that electrical network alternating current-direct current is moved simultaneously, launch research, propose the fitting method of the urgent power control of a kind of direct current and safety and stability control strategy, thereby realize the effective processing to fault in ac transmission system.
Summary of the invention
Object of the present invention, be to provide the processing method of fault in ac transmission system in a kind of AC/DC transmission line, it is controlled the urgent power of direct current to combine with safety and stability control strategy, the method that adopts the urgent power of direct current to control after there is fault in ac transmission system reduces the machine of always the cutting amount of system, improves the whole economic efficiency of operation of power networks.
In order to reach above-mentioned purpose, solution of the present invention is:
In AC/DC transmission line, a processing method for fault in ac transmission system, comprises the steps:
(1) obtain electrical network actual operating data;
(2) obtain the performance number that DC line is carried in real time, and according to the capability of overload of direct current design, determine that direct current system can instantaneous lifting or the performance number of reduction, the transfer function that the urgent power of design direct current is controlled;
(3) mode by calculated off-line obtains taking the machine of cutting amount required in the urgent power control of direct current situation under fault in ac transmission system, releases the urgent power of direct current control the action effect to fault in ac transmission system by calculated off-line result, formulates Off-line control strategy;
(4) when there is fault in ac transmission system, according to Off-line control strategy, judge whether to take the urgent power of direct current to control, if do not need, do not signal to direct current power control device, if desired urgent power ascension, the magnitude of power according to the Off-line control strategy of formulating, needs being promoted is passed to DC power modulation controller, and safety and stability control device takes to cut machine or cutting load measure according to Off-line control strategy simultaneously.
In above-mentioned steps (2), while designing the transfer function of the urgent power control of direct current, circuit input power selects the circuit of transmission cross-section as input, passes through successively inertial element, filtering link, every straight link, lead-lag link and amplitude limit link, then the active power of output modulation.
Above-mentioned steps (3) specifically comprises following content:
(31) scan N-2 fault or the combined fault of important ac transmission section, important alternating current circuit, determine the urgent power control of direct current to which fault in ac transmission system plays a role clearly;
(32) determine that under fault in ac transmission system, the urgent power of direct current is controlled the impact of safety and stability control after fault being cut to machine amount, whether can reduce the machine of the cutting amount after the system failure;
(33) by off-line simulation, calculate which fault in ac transmission system and can adopt the urgent power of direct current to control, write Off-line control strategy.
Adopt after such scheme, the present invention is by controlling the urgent power of direct current to match with safety and stability control strategy, when ac and dc systems moves simultaneously, after AC system generation catastrophe failure, by direct current, enable urgent power and control, thus the machine of the cutting amount of safety and stability control device after minimizing fault, instantaneous lifting or reduction transmission power, maintain system stability, improve the whole economic efficiency of operation of power networks.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is that in the present invention, the urgent power of direct current is controlled the flow chart coordinating with safety and stability control;
Fig. 3 is the transfer function schematic diagram that in the present invention, the urgent power of direct current is controlled;
Wherein:
S: complex frequency;
P
lINE: meritorious input variable, can get the power of certain circuit, the total transmit power power sum that also can get certain section;
T
mesR: frequency measurement time constant (second);
T
w: every straight link time constant (second);
K
p: power modulation gain;
T
0: filter parameter (second);
T
1: first leading time function (second);
T
2: first function lag time (second);
T
3: second leading time function (second);
T
4: second function lag time (second);
P
max: DC power modulation amount higher limit (pu be take direct current rated power as benchmark);
P
min: DC power modulation amount lower limit (pu be take direct current rated power as benchmark);
Δ P
mod: the change amount of DC line power output (pu be take direct current rated power as benchmark);
Fig. 4 is the formulation schematic diagram of Off-line control strategy 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 the processing method of fault in ac transmission system in a kind of AC/DC transmission line, comprise the steps:
(1) obtain electrical network actual operating data, comprise stable control station, cutting load actuating station, cut the data such as machine actuating station;
(2) obtain the performance number that DC line is carried in real time, and according to the capability of overload of direct current design, determine that direct current system can instantaneous lifting or the performance number of reduction, the transfer function that the urgent power of design direct current is controlled; As shown in Figure 3, circuit input power can select the circuit of transmission cross-section as input, successively through inertial element, filtering link, after straight link, lead-lag link, amplitude limit link the active power of output modulation again, as shown in Figure 3.
As according to 1.1 times of overload capacity of direct current system, the meritorious speed that promotes is controlled at 500MW/s, the meritorious transfer function amplitude limit link of direct current must be limited in the meritorious scope of 1.1 times, and last amplitude limit link is limited, and power ascension speed is controlled at below 500MW/s.
(3) mode by calculated off-line obtains taking the machine of cutting amount required in the urgent power control of direct current situation under more serious fault in ac transmission system, as the fault that trips at certain transmission cross-section double back 500kV circuit generation two-wire.Action when calculating the urgent power control of direct current system and stability control equipment, the unit shut algorithm amount of stability control equipment.By calculated off-line result, release the urgent power of direct current and control the action effect to fault in ac transmission system, formulate Off-line control strategy, can coordinate shown in Fig. 4; By calculated off-line result, release the urgent power of direct current and control the action effect to fault in ac transmission system, formulate Off-line control strategy; Specifically comprise following content:
(31) scan N-2 fault or the combined fault of important ac transmission section, important alternating current circuit, determine the urgent power control of direct current to which fault in ac transmission system plays a role clearly;
(32) determine that under fault in ac transmission system, the urgent power of direct current is controlled the impact of safety and stability control after fault being cut to machine amount, whether can reduce the machine of the cutting amount after the system failure;
(33) by off-line simulation, calculate which fault in ac transmission system and can adopt the urgent power of direct current to control, write Off-line control strategy;
(4) between DC power modulation controller and safety and stability control device, set up and communicate by letter, by the Off-line control strategy writing station program of formulating in step (3); When there is fault in ac transmission system, according to Off-line control strategy, judge whether to take the urgent power of direct current to control, if do not need, do not signal to direct current power control device, if desired urgent power ascension, the magnitude of power according to the Off-line control strategy of formulating, needs being promoted is passed to DC power modulation controller, and safety and stability control device takes to cut machine or cutting load measure according to Off-line control strategy simultaneously.
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 proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection range of the present invention.
Claims (3)
1. a processing method for fault in ac transmission system in AC/DC transmission line, is characterized in that comprising the steps:
(1) obtain electrical network actual operating data;
(2) obtain the performance number that DC line is carried in real time, and according to the capability of overload of direct current design, determine that direct current system can instantaneous lifting or the performance number of reduction, the transfer function that the urgent power of design direct current is controlled;
(3) mode by calculated off-line obtains taking the machine of cutting amount required in the urgent power control of direct current situation under fault in ac transmission system, releases the urgent power of direct current control the action effect to fault in ac transmission system by calculated off-line result, formulates Off-line control strategy;
(4) when there is fault in ac transmission system, according to Off-line control strategy, judge whether to take the urgent power of direct current to control, if do not need, do not signal to direct current power control device, if desired urgent power ascension, the magnitude of power according to the Off-line control strategy of formulating, needs being promoted is passed to DC power modulation controller, and safety and stability control device takes to cut machine or cutting load measure according to Off-line control strategy simultaneously.
2. the processing method of fault in ac transmission system in a kind of AC/DC transmission line as claimed in claim 1, it is characterized in that in described step (2), while designing the transfer function of the urgent power control of direct current, circuit input power selects the circuit of transmission cross-section as input, pass through successively inertial element, filtering link, every straight link, lead-lag link and amplitude limit link, then the active power of output modulation.
3. the processing method of fault in ac transmission system in a kind of AC/DC transmission line as claimed in claim 1 or 2, is characterized in that: described step (3) specifically comprises following content:
(31) scan N-2 fault or the combined fault of important ac transmission section, important alternating current circuit, determine the urgent power control of direct current to which fault in ac transmission system plays a role clearly;
(32) determine that under fault in ac transmission system, the urgent power of direct current is controlled the impact of safety and stability control after fault being cut to machine amount, whether can reduce the machine of the cutting amount after the system failure;
(33) by off-line simulation, calculate which fault in ac transmission system and can adopt the urgent power of direct current to control, write Off-line control strategy.
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| CN106021673A (en) * | 2016-05-13 | 2016-10-12 | 国网江苏省电力公司电力科学研究院 | Power grid online simulation-based direct-current power support pre-decision method |
| CN106356856A (en) * | 2016-09-18 | 2017-01-25 | 国电南瑞科技股份有限公司 | Safety correction calculating method based on regional load control |
| CN104882901B (en) * | 2015-06-19 | 2017-04-12 | 中国电力科学研究院 | Direct-current power energy area compensation method based on converter station local information |
| CN107492914A (en) * | 2017-09-05 | 2017-12-19 | 中国电力科学研究院 | Extra-high voltage direct-current participates in the control method and device of tetanic weak alternating current net security perimeter |
| CN107546756A (en) * | 2017-08-22 | 2018-01-05 | 中国电力科学研究院 | A kind of method for controlling power balance and system for tackling voltage to frequency coupling |
| CN108767856A (en) * | 2018-06-27 | 2018-11-06 | 广东电网有限责任公司 | A kind of general stabilized control system and its control method |
| CN109301833A (en) * | 2018-10-09 | 2019-02-01 | 国家电网有限公司 | AC-DC hybrid power grid transmission cross-section overload controlling method based on path removing |
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| CN106021673A (en) * | 2016-05-13 | 2016-10-12 | 国网江苏省电力公司电力科学研究院 | Power grid online simulation-based direct-current power support pre-decision method |
| CN106356856A (en) * | 2016-09-18 | 2017-01-25 | 国电南瑞科技股份有限公司 | Safety correction calculating method based on regional load control |
| CN106356856B (en) * | 2016-09-18 | 2018-10-09 | 国电南瑞科技股份有限公司 | A kind of Security corrective computational methods based on partition load control |
| CN107546756A (en) * | 2017-08-22 | 2018-01-05 | 中国电力科学研究院 | A kind of method for controlling power balance and system for tackling voltage to frequency coupling |
| CN107546756B (en) * | 2017-08-22 | 2022-04-29 | 中国电力科学研究院 | Power balance control method and system for coping with frequency-voltage coupling effect |
| CN107492914A (en) * | 2017-09-05 | 2017-12-19 | 中国电力科学研究院 | Extra-high voltage direct-current participates in the control method and device of tetanic weak alternating current net security perimeter |
| CN107492914B (en) * | 2017-09-05 | 2019-08-16 | 中国电力科学研究院 | Extra-high voltage direct-current participates in the control method and device of tetanic weak alternating current net security perimeter |
| CN108767856A (en) * | 2018-06-27 | 2018-11-06 | 广东电网有限责任公司 | A kind of general stabilized control system and its control method |
| CN109301833A (en) * | 2018-10-09 | 2019-02-01 | 国家电网有限公司 | AC-DC hybrid power grid transmission cross-section overload controlling method based on path removing |
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