CN111900737A - Key section channel overhaul evaluation method suitable for double-power high-voltage direct current feed-in net rack - Google Patents
Key section channel overhaul evaluation method suitable for double-power high-voltage direct current feed-in net rack Download PDFInfo
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- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a key section channel overhaul evaluation method suitable for a double-power high-voltage direct current feed-in net rack, belonging to the technical field of electric power operation and maintenance, and comprising the following steps of 1: calculating a multi-feed short-circuit ratio MSCR or a hierarchical direct-current short-circuit ratio HSCR in a receiving-end two-circuit direct-current maintenance mode; step 2: judging whether a certain direct current MSCR or HSCR after the maintenance of a certain line exists in the key section is lower than a limit value MSCRmin or HSCRmin, if so, turning to the step 3, otherwise, turning to the step 4, and turning to the step 3: adjusting the direct current power to meet the requirement of the multiple direct current effective feed-in short circuit ratio, and step 4: calculating the coupling index between the two loops of direct currents i and j after different channels are overhauled, and step 5: and when the corresponding channel with lower coupling index is overhauled, the area of simultaneous commutation failure of double-circuit direct current can be reduced. The method can quantitatively evaluate the influence of key section channel maintenance on the dual-high voltage feed-in net rack, reduce the fault area of simultaneous commutation failure of two loops of direct current, improve the maintenance efficiency and improve the stable operation level of a direct current transmission and receiving end power grid.
Description
Technical Field
The invention relates to the technical field of electric power operation and maintenance, in particular to a key section channel overhaul evaluation method suitable for a double-power high-voltage direct current feed-in net rack.
Background
China's resource endowment and load center is in reverse distribution, energy production and consumption structural imbalance, and large-scale long-distance transmission becomes the inevitable choice. With the rapid development of ultra/extra-high voltage direct current engineering in China, the receiving-end power grid mostly presents a multi-direct current centralized feed-in pattern, alternating current is influenced by mutual coupling between direct current and different direct current, and the operation characteristics of the power grid are increasingly complex.
Aiming at a multi-extra-high voltage direct current feed-in power grid, when the electrical distance between different direct current drop points is short, the mutual coupling influence between two direct currents is large, and after an alternating current grid frame at a receiving end fails, two loops of direct currents can simultaneously cause phase commutation failure, so that power disturbance is generated at a direct current transmission end. If the two direct currents belong to the same transmitting end and the same receiving end structure, when the simultaneous phase commutation fails, the two direct currents generate power disturbance on the same alternating current transmitting end, and power and frequency instability of a transmitting end power grid can be caused.
In order to support the stable operation of double direct currents, a receiving end alternating current power grid needs to keep certain grid frame strength. However, due to planned and unplanned maintenance, the grid strength of the receiving-end alternating-current power grid will be reduced, and when a line which is close to the direct-current receiving-end bus is subjected to planned and unplanned maintenance, the short-circuit ratio of the direct-current receiving-end bus is possibly reduced more, so that direct current cannot run at full power, and the direct-current transmission power needs to be reduced to improve the short-circuit ratio of the direct-current receiving-end bus to an acceptable level. On the other hand, the electric distance between the two direct currents can be weakened when part of lines are subjected to planned maintenance and unplanned maintenance, and the fault area of two direct currents with phase commutation failure caused by specific fortification faults can be reduced. Aiming at a double direct current feed-in power grid, the development of line maintenance evaluation research in a critical section is urgently needed, and the influence of line maintenance on a system is evaluated.
Patent document CN 103218530 a discloses a reliability evaluation method and system for shutdown maintenance of a dc power transmission system, the evaluation method includes: selecting a fault set comprising at least one fault; acquiring operation statistical parameters of the direct current transmission system when the faults in the fault set occur in normal operation; acquiring maintenance statistical parameters of the direct current transmission system when the concentrated faults occur in the outage maintenance mode; and evaluating the reliability of the shutdown maintenance mode according to the operation statistical parameters and the maintenance statistical parameters. The patent document compares different statistical parameters of the dc transmission system during normal operation and during one of the shutdown maintenance modes to obtain a specific reliability index, and performs reliability evaluation on the shutdown maintenance mode used by the dc transmission system according to the specific reliability index to determine whether the shutdown maintenance mode meets the requirement of reliability. However, the invention cannot perform maintenance and evaluation on key section channels of the dual-high-voltage direct-current feed-in net rack, and cannot solve the technical problem.
The patent document with publication number CN 108258714 a discloses a power grid startup mode optimization method for improving the capacity of hierarchically accessing extra-high voltage direct current transmission, which is characterized in that on the premise of fixed grid structure and certain load, on the basis of obtaining the sensitivity of direct current power evacuation channel tide relative to the output of an intra-grid unit and direct current floor power, the output of a receiving-end power grid unit is adjusted, and under the condition of meeting the constraint condition of stable limit of a receiving-end power grid direct current evacuation section, the tide is optimized, the transmission capacity of hierarchical direct current is improved, so as to determine the maximum power transmission capacity of direct current limited by the receiving-end power grid current evacuation capacity. The invention ensures the full play of the capacity of the direct current system and improves the power transmission capacity of the extra-high voltage layered direct current by reasonably arranging the operation mode of the extra-high voltage layered direct current feed-in system. However, the invention cannot solve the problem of evaluating the commutation failure area during the key section channel maintenance of the dual-high-voltage direct-current feed-in net rack.
Disclosure of Invention
In view of the above, the present invention provides a method for evaluating the overhaul of a critical section channel of a bi-level high-voltage direct-current feed-in grid, which can evaluate the influence of the overhaul of the critical section channel on the bi-level high-voltage feed-in grid.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a key section channel overhaul evaluation method suitable for a double-head high-voltage direct-current feed-in net rack comprises the following steps:
step 1: calculating the multi-feed short-circuit ratio MSCR or the layered direct-current short-circuit ratio HSCR under the receiving-end two-circuit direct-current maintenance mode,
if the receiving end direct current is the extra-high voltage direct current, calculating the MSCR of the direct current; if the receiving end direct current is the layered direct current, respectively calculating HSCRs corresponding to the high end and the low end of the layered direct current;
step 2: judging whether a certain direct current MSCR or HSCR after the detection and the repair of a certain line exists in the key section is lower than a limit value MSCRmin or HSCRmin, if so, turning to the step 3, otherwise, turning to the step 4;
and step 3: the channel maintenance is a key line, if the channel maintenance is carried out, the direct current power needs to be adjusted to meet the requirement of the multi-direct current effective feed-in short circuit ratio, and the step 4 is carried out;
and 4, step 4: calculating the coupling index eta between two loops of direct current i, j after different channels are overhauledij，ηijCalculating the formula:
wherein, MIIFijFor the influence of DC j on DC i, MIIFjiIs the influence of direct current i on direct current j;
and 5: and when the corresponding channel with lower coupling index is overhauled, the area of simultaneous commutation failure of double-circuit direct current can be reduced.
Further, in step 2, the suggested value of MSCRmin and HSCRmin is 3.
Further, in step 3, the multi-dc effective feed-in short-circuit ratio is a layered dc short-circuit ratio.
Further, in step 4, for the hierarchical direct current, usually, when the alternating current system fails due to the fact that the electrical distance between the two ends is short, commutation failure may occur at the same time, a node with a higher hierarchical direct current short circuit ratio is selected to calculate the MIIF, and a node with a lower hierarchical direct current short circuit ratio is not considered any more.
Further, in step 5, in order to reduce the risk of phase commutation failure, a channel corresponding to a lower coupling index is preferentially scheduled for overhaul.
The increase of the construction of the extra-high voltage direct current transmission line makes the situation that a plurality of direct current lines feed one same receiving end system more and more common, the receiving end grid structure directly influences the strength and the safety stability of the multi-feeder direct current system, the feed of the extra-high voltage direct current transmission line influences the safe and economic operation of the receiving end power transmission network, therefore, the prior art people mostly think of improving the grid strength, and for the channel maintenance of the extra-high voltage direct current feed grid, in order to ensure the stable operation of the electric power, the prior art people usually adopt the comprehensive maintenance and investigation of fault areas, such as the Panyi, Zhengjiangyong, Hanjun, Zussu, Matian, the receiving end power transmission grid optimization method considering the extra-high voltage direct current feed-in [ J ]. electric power construction, 2019,40(4):1-8, and as the reliability evaluation method based on the deep two-way search method disclosed by the patent document with the publication number of CN, the method comprises the following steps: s1, collecting and summarizing data of each typical grid structure in the distribution network system to be researched; s2, building a model of each typical grid structure of the distribution network system based on the MATLAB platform; and S3, performing simulation calculation on the model of each typical grid structure by adopting a depth bidirectional search method, and obtaining a reliability calculation result in the distribution network system maintenance mode through simulation. Therefore, for the key section channel maintenance of the dual-high voltage dc feed-in net rack, it is not easy for those skilled in the art to estimate the influence of the key section channel maintenance on the dual-high voltage feed-in net rack and reduce the simultaneous commutation failure area.
In practical application, due to wide coverage and high maintenance difficulty, a fault area needs to be accurately calculated and further contracted, however, fault areas of two direct current phase commutation failures of the double-station high-voltage direct current feed-in net rack are affected by various factors and have more variation factors, for example, an extra-high voltage direct current transmission bipolar line fault restart coordination function improvement method and system disclosed in patent document with publication number CN 105425103B, by judging faults of a local pole and an opposite pole direct current line and widening free time, whether the opposite pole valve group is in an unlocked state or not is considered, and one of the following conditions is satisfied: starting the function of 'forbidding the restarting function of the other direct current line in the restarting process of the direct current line at one pole'; or the direct current circuit is in an island operation mode, the local pole locking is realized. By the method and the system, the risk that bipolar locking is caused when the other polar line fails after the one polar line fails and restarts successfully is avoided; meanwhile, in the fault restarting process of one polar line, if the other polar line has a fault, bipolar locking is executed, and the requirement of the fault restarting coordination function of the bipolar line is met; also, for example, patent document No. CN106972517B discloses a method for calculating reliability of an extra-high voltage dc power transmission system based on bipolar symmetry characteristics. According to the topological structure of the ultra-high voltage direct current transmission system and element reliability parameters thereof, serial simplification is carried out to obtain a unipolar equivalent model and component reliability parameters of the ultra-high voltage direct current transmission system, according to all possible fault states and conversion relations among the fault states, a unipolar state space model is established, a differential equation containing a capacity state transfer matrix X is constructed, steady-state probabilities corresponding to the fault states are calculated and obtained, the same capacity states are combined to obtain accumulated probabilities corresponding to the number NT of converter bridges normally operating in a unipolar, and then the steady-state probabilities corresponding to the number NT of converter bridges normally operating in a bipolar are obtained according to the accumulated probabilities. Therefore, by adopting the evaluation method, the influence of key section channel maintenance on the double-high voltage feed-in net rack is evaluated, and the fault areas of two direct current simultaneous commutation failures are reduced, which is difficult to realize by the personnel in the prior art.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a key section channel maintenance evaluation method suitable for a dual-band high-voltage direct-current feed-in net rack, which judges whether a certain direct-current MSCR or HSCR is lower than a limit value MSCRmin or HSCRmin after a certain line is detected and repaired in a key section by calculating a multi-feed short-circuit ratio MSCR or a layered direct-current short-circuit ratio HSCR under a receiving-end two-circuit direct-current maintenance mode, if the certain direct-current MSCR or HSCR is lower than the limit value MSCRmin or HSCRmin, the direct-current power needs to be adjusted to meet the requirement of a multi-direct-current effective feed-in short-circuit ratio, andijthe influence of the key section channel maintenance on the double-high voltage feed-in net rack can be evaluated, when the section maintenance causes the ratio of the extra-high voltage direct current multi-feed-in short circuit at the receiving end to be too small, the power of the corresponding direct current needs to be reduced, and the maintenance is not recommended; when the section maintenance causes the provided direct current coupling index to be reduced, the line maintenance is recommended, and the simultaneous commutation failure area corresponding to two loops of extra-high voltage direct current at the receiving end can be reduced.
In addition, the coupling index between the two loops of direct current can quantitatively evaluate the interaction effect between the two loops of direct current. The key section channel maintenance evaluation method suitable for the double-power-factor high-voltage direct-current feed-in net rack can quantitatively evaluate the influence of key section channel maintenance on the double-power-factor high-voltage feed-in net rack, reduce the fault area of simultaneous commutation failure of two loops of direct current, improve the maintenance efficiency and improve the stable operation level of a direct current transmission and receiving end power grid.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a diagram of a region where phase commutation fails simultaneously by DC and relaxed DC in the second embodiment of the present invention;
FIG. 3 is a diagram of a region where phase commutation fails simultaneously by DC in the sky and by DC in the Qingyu-Huadu mode in the second embodiment of the present invention.
Detailed Description
In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
Example one
As shown in fig. 1, a method for evaluating the overhaul of critical section channels of a dual-band high-voltage direct-current feeder network frame includes the following steps:
step 1: calculating the multi-feed short-circuit ratio MSCR or the layered direct-current short-circuit ratio HSCR under the receiving-end two-circuit direct-current maintenance mode,
if the receiving end direct current is the extra-high voltage direct current, calculating the MSCR of the direct current; if the receiving end direct current is the layered direct current, respectively calculating HSCRs corresponding to the high end and the low end of the layered direct current;
step 2: judging whether a certain direct current MSCR or HSCR after the detection and the repair of a certain line exists in the key section is lower than a limit value MSCRmin or HSCRmin, if so, turning to the step 3, otherwise, turning to the step 4, wherein the recommended value of MSCRmin and HSCRmin is 3;
and step 3: the channel maintenance is a key line, if the channel maintenance is carried out, the direct current power needs to be adjusted to meet the requirement of the multi-direct-current effective feed-in short circuit ratio, and the step 4 is carried out, wherein the multi-direct-current effective feed-in short circuit ratio is the layered direct current short circuit ratio;
and 4, step 4: calculating the coupling index eta between two loops of direct current i, j after different channels are overhauledij，ηijCalculating the formula:
wherein, MIIFijFor the influence of DC j on DC i, MIIFjiTo account for the effect of dc i on dc j,
aiming at the layered direct current, usually, due to the fact that the electrical distance between two ends is short, when an alternating current system fails, commutation failure can happen at the same time, a node with a higher layered direct current short circuit ratio is selected to calculate MIIF, and a node with a lower layered direct current short circuit ratio is not considered;
and 5: and when the corresponding channel with the lower coupling index is overhauled, the area of the double-circuit direct current simultaneous commutation failure can be reduced, and in order to reduce the risk of the simultaneous commutation failure, the corresponding channel with the lower coupling index is preferentially overhauled.
The key section channel overhaul evaluation method applicable to the double-station high-voltage direct-current feed-in net rack can evaluate the influence of key section channel overhaul on the double-station high-voltage feed-in net rack, when the section overhaul causes the ultra-high voltage direct-current multi-feed-in short circuit ratio of a receiving end to be too small, the power of corresponding direct current needs to be reduced, and overhaul is not recommended; when the section maintenance causes the provided direct current coupling index to be reduced, the line maintenance is recommended, and the simultaneous commutation failure area corresponding to two loops of extra-high voltage direct current at the receiving end can be reduced.
The coupling index between the two loops of direct current can quantitatively evaluate the interaction influence between the two loops of direct current, and the influence of key section channel maintenance on the double-voltage feed-in net rack can be quantitatively evaluated, so that the fault area of simultaneous commutation failure of the two loops of direct current is reduced, the maintenance efficiency is improved, and the stable operation level of a direct current transmission receiving end power grid is improved.
Example two
The embodiment of the invention is suitable for the key section channel maintenance and evaluation method of the double-station high-voltage direct-current feed-in net rack, and is different from the first embodiment in that:
taking the Henan power grid in the planning as an example, the Henan power grid forms a direct current and green and Yu direct current double-feed-in pattern in the day. The Tianzhong DC Daozhou region, Hengzhong region, the southeast Henan shop region, the Qingyu DC Daozhou region. The key section between the two loops of direct current is Yuzhong-Henan section, which is composed of four channels, namely Jiahe-Guangcheng, Wuzhou-Tu, Wuzhou-Xiangshan and Xiang Fu-Huadu channels.
(1) After different channels in key sections of yunan and yunan are overhauled, the direct current multi-feed short circuit ratio in the sky is shown in table 1.
TABLE 1 relevant DC-to-DC short-circuit ratio indicators after different channel overhauls in Yunan critical section
(2) After different lines in the key Henan key section in Henan are judged to be overhauled, the multi-feed short-circuit ratio and the layered direct-current short-circuit ratio corresponding to the direct current in the heaven and the direct current in the Henan are both not lower than 3(MSCRmin or HSCRmin). Therefore, after any channel in the key section of Yunan in Henan is overhauled, the direct current power does not need to be adjusted so as to meet the requirement of the receiving end short circuit ratio.
(3) After different lines in the key section of yunan-yunan are overhauled, the direct current coupling indexes of the corresponding d.c. in the heaven and yunan are shown in table 2.
TABLE 2 D.C. and D.C. interactive factors after different channels in key section of Yunan-Yunan examination
Note: the subscript 1 indicates day dc and the subscript 2 indicates relaxation dc.
(4) As can be seen from table 2, after the mascot-huadu channel is repaired, the dc coupling index corresponding to the dc and the yun dc in the day is the lowest, and the area where the simultaneous commutation of the dc and the yun dc in the day fails due to the specified fault type in the corresponding ac system is reduced.
The area of the 500kV line N-1 fault which is used for checking the fault and simultaneously causes the phase commutation failure of the Hazheng and the Qingyu direct currents is shown in figure 2, when the Luck-Huadu channel is overhauled, the area of the 500kV line N-1 fault which simultaneously causes the phase commutation failure of the Hazheng and the Qingyu direct currents is shown in figure 3, and as can be seen from figures 2 and 3, after the Luck-Huadu channel is overhauled, the area of the 500kV line N-1 which causes the phase commutation failure of the Hazheng and the Qingyu direct currents is reduced. When the power grid line in Henan is overhauled, a detailed symbol-Huadu channel can be preferentially arranged for overhauling in order to reduce the risk of simultaneous commutation failure of direct current and green and Yu direct current in the sky.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A key section channel overhaul evaluation method suitable for a double-head high-voltage direct-current feed-in net rack is characterized by comprising the following steps:
step 1: calculating the multi-feed short-circuit ratio MSCR or the layered direct-current short-circuit ratio HSCR under the receiving-end two-circuit direct-current maintenance mode,
if the receiving end direct current is the extra-high voltage direct current, calculating the MSCR of the direct current; if the receiving end direct current is the layered direct current, respectively calculating HSCRs corresponding to the high end and the low end of the layered direct current;
step 2: judging whether a certain direct current MSCR or HSCR after the detection and the repair of a certain line exists in the key section is lower than a limit value MSCRmin or HSCRmin, if so, turning to the step 3, otherwise, turning to the step 4;
and step 3: the channel maintenance is a key line, if the channel maintenance is carried out, the direct current power needs to be adjusted to meet the requirement of the multi-direct current effective feed-in short circuit ratio, and the step 4 is carried out;
and 4, step 4: calculating the coupling index eta between two loops of direct current i, j after different channels are overhauledij，ηijCalculating the formula:
wherein, MIIFijFor the influence of DC j on DC i, MIIFjiIs the influence of direct current i on direct current j;
and 5: and when the corresponding channel with lower coupling index is overhauled, the area of simultaneous commutation failure of double-circuit direct current can be reduced.
2. The method of claim 1, wherein the method comprises the following steps: in step 2, the recommended value of MSCRmin and HSCRmin is 3.
3. The method of claim 2, wherein the method comprises the following steps: in step 3, the multi-direct-current effective feed-in short-circuit ratio is the layered direct-current short-circuit ratio.
4. The method of claim 3, wherein the method comprises the following steps: in step 4, for the hierarchical direct current, usually, when the alternating current system fails due to the fact that the electrical distance between the two ends is short, commutation failure occurs at the same time, a node with a high hierarchical direct current short circuit ratio is selected to calculate the MIIF, and a node with a low hierarchical direct current short circuit ratio is not considered any more.
5. The method of claim 4, wherein the evaluation method is applied to the maintenance of critical section channels of the bi-directional high-voltage direct current feeder network frame, and comprises the following steps: in step 5, in order to reduce the risk of phase commutation failure, the corresponding channel with a lower coupling index is preferentially arranged for maintenance.
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