CN110581564A - Method and system for determining extra-high voltage direct current commutation failure accelerated protection strategy - Google Patents
Method and system for determining extra-high voltage direct current commutation failure accelerated protection strategy Download PDFInfo
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Abstract
The invention discloses a method and a system for determining an extra-high voltage direct current commutation failure accelerated protection strategy, wherein the method comprises the following steps: determining the operation mode of an alternating current-direct current hybrid power grid, and setting the current direct current commutation frequency as a first preset frequency threshold; when the number of continuous phase change failure times of the alternating-current and direct-current hybrid power grid is the current direct-current phase change times and no locking occurs after the last phase change failure, checking the stability of the alternating-current and direct-current hybrid power grid to obtain a first checking result; when the first check result indicates that the power grid is unstable, when the number of times of phase change failure of the alternating-current and direct-current hybrid power grid is continuously equal to the current number of times of direct-current phase change and locking occurs after the last phase change failure, checking a second check result; and when the current second check result indicates that the power grid is stable, determining a protection strategy corresponding to the current direct current power. The method is simple and easy to implement, and can obviously improve the calculation efficiency and save the cost of manpower, material resources and the like in the direct-current commutation failure calculation.
Description
Technical Field
The invention relates to the field of safe and stable operation of a large alternating current-direct current hybrid power grid, in particular to a method and a system for determining an extra-high voltage direct current commutation failure acceleration protection strategy.
background
Compared with the traditional alternating Current transmission, the High Voltage Direct Current transmission (HVDC) has the advantages of less occupied line corridor, no static stability constraint on transmission distance and the like. In order to optimize the energy resource allocation of China and meet the economic growth demand of the east region, the high-capacity extra-high voltage direct current transmission project is put into operation successively. By 12 months end in 2018, 9 ultrahigh voltage (+/-800 kV and above) direct current transmission projects and 9 ultrahigh voltage (+/-800 kV and below) long-distance direct current transmission projects are already in use in China. In addition, system debugging of +/-1100 kV Changji-Guquan and +/-800 kV Shanghai Temple-Shandong extra-high voltage direct current transmission projects is completed in the early 2019, 11 extra-high voltage direct current transmission projects which are accumulated to be put into operation at that time are achieved, and the interconnection of the extra-high voltage direct current projects and a traditional alternating current power grid forms a large-scale alternating current and direct current series-parallel transmission pattern in China.
the existing high-voltage direct-current transmission technology is based on a thyristor-based line voltage phase-change converter, and has a natural phase-change failure problem on a receiving-end inversion side. For large-scale DC asynchronous interconnection systems, the interaction effect of the transmitting and receiving end systems is more obvious due to the 'conduction' effect of large-scale DC dynamic response characteristics. The problems of overvoltage, transient power angle instability and the like of a power grid at a transmitting end and a receiving end can be caused by large-scale instantaneous power impact generated in the process of direct-current multiple continuous commutation failure, and the safe and stable operation of a large alternating-current and direct-current series-parallel power grid is seriously influenced. Especially during the period of simultaneous commutation failure of multiple direct currents at the same transmitting end and receiving end, surplus power generated by high-power transmission instantaneous interruption can be transferred to an alternating current system, great energy impact is likely to be caused on the weak section of the alternating current system, a series of safety and stability problems are induced, and even a large power failure accident is caused. The problem that the large alternating current and direct current series-parallel transmission pattern cannot be avoided and needs attention urgently is solved.
with the increase of the frequency of the continuous direct current commutation failure, the power impact of the commutation failure of the direct current system on the alternating current power grid at the transmitting end and the receiving end is larger and larger, so that the arrangement of the power grid operation mode is more and more difficult. Under the current grid 'strong direct current weak alternating current' pattern, in order to ensure the safe and stable operation of a large alternating current-direct current hybrid grid in China, the checking calculation of commutation failure accelerated protection must be carried out on each direct current, the maximum tolerable commutation failure frequency of each direct current is determined, and a corresponding protection strategy is configured.
in the simulation calculation process of safe and stable operation of a large-scale alternating current-direct current hybrid power grid, the commutation failure acceleration protection strategy mainly refers to that direct current is at a certain power level P0And after i +1 th time of direct current blocking, the transmitting and receiving end alternating current and direct current parallel-serial power grid can keep safe and stable operation. Fig. 1 shows a process of checking a protection strategy for ensuring a dc commutation failure in the safe and stable operation of a large-scale ac/dc hybrid power grid.
the bipolar power change after 2 consecutive commutation failures of direct current is shown in fig. 2 (a); fig. 2(b) shows the bipolar power change when 3 rd commutation fails after 2 consecutive commutation failures of dc. Taking the following processes as an example that the direct current has 2 consecutive commutation failures (hereinafter referred to as "commutation failure 2 times") and the 3 rd latching direct current (hereinafter referred to as "commutation failure 2+ 1") with 2 consecutive commutation failures: a fault I (2 continuous commutation failures), wherein the first commutation failure occurs within 1s of fault time, and the second commutation failure occurs within 1.2 s; and (3 rd latching Direct Current (DC)) when 2 phase commutation failures are continuously performed, the first phase commutation failure starts to occur within 1s of the failure time, the second phase commutation failure occurs within 1.2s, the third phase commutation failure occurs within 1.4s, 1.43s of DC latching occurs, all filters are cut off within 1.63s, and all matched power supplies are cut off within 1.73 s.
In order to compare the influence of different direct current commutation failure times on system stability under the same direct current power level, fig. 3(a) and fig. 3(b) respectively show direct current unipolar power change curves after 2 and 3 continuous commutation failures of direct current occur. The area enclosed by the dotted line can represent the active power impact on the alternating current system during the phase commutation failure of the direct current system. Obviously, at the same power level, the active power impact on the system caused by i +1 times of continuous commutation failure of direct current is larger than that caused by i times of continuous commutation failure.
however, the existing standard does not have a unified specification for the calculation method of the accelerated protection of the direct current commutation failure, and the calculation method is summarized by traversing and calculating various possible modes, so that the calculation amount is large and the calculation efficiency is low.
therefore, a method for ensuring safe and stable operation of a large-scale alternating current-direct current hybrid power grid by determining a reasonable commutation failure accelerated protection strategy based on simple calculation is needed.
disclosure of Invention
The invention provides a method and a system for determining an extra-high voltage direct current commutation failure accelerated protection strategy, which are used for solving the problem of how to determine the extra-high voltage direct current commutation failure accelerated protection strategy in an alternating current-direct current hybrid power grid.
in order to solve the above problem, according to an aspect of the present invention, there is provided a method for determining an extra-high voltage direct current commutation failure accelerated protection strategy, where the method includes:
step 1, determining the operation mode of an alternating current-direct current series-parallel power grid, and setting the current direct current commutation times;
step 2, when the number of times of phase change failure of the alternating-current and direct-current hybrid power grid is continuously equal to the current number of times of direct-current phase change and no locking occurs after the last phase change failure, checking the stability of the alternating-current and direct-current hybrid power grid to obtain a first checking result;
Step 3, when the first check result indicates that the power grid is unstable, when the continuous phase commutation failure times of the alternating current and direct current hybrid power grid are the current direct current phase commutation times and locking occurs after the last phase commutation failure, checking the stability of the alternating current and direct current hybrid power grid to obtain a second check result;
Step 4, when the current second check result indicates that the power grid is stable, determining a protection strategy corresponding to the current direct current power; the protection strategy corresponding to the current direct current power is as follows: the maximum value of the continuous commutation failure times which can be borne by the current direct-current power is the difference value between the current direct-current commutation failure times and a first preset threshold value, locking occurs when the continuous commutation failure times are the current direct-current commutation times, and the alternating-current and direct-current series-parallel power grid can keep safe and stable operation after locking occurs.
Preferably, wherein the method further comprises:
And when the first check result indicates that the power grid is stable, if the current continuous phase commutation failure times are smaller than a second preset threshold, updating the continuous phase commutation failure times, taking the sum of the current continuous phase commutation failure times and a third preset threshold as the updated direct current phase commutation times, and returning to the step 2.
Preferably, wherein the method further comprises:
And when the first check result indicates that the power grid is stable, if the current number of the phase change failure continuously occurs is equal to a second preset threshold value, directly determining a protection strategy corresponding to the current direct current power.
Preferably, wherein the method further comprises:
And when the current second check result indicates that the power grid is unstable, and the difference value between the current continuous phase commutation failure times and the fourth preset threshold value is larger than the fifth preset threshold value, taking the difference value between the current continuous phase commutation failure times and the fourth preset threshold value as the updated direct current phase commutation times, and checking the power grid stability when the alternating current-direct current hybrid power grid is locked after the last phase commutation failure, so as to obtain the second check result again.
Preferably, wherein the method further comprises:
And when the second check result indicates that the power grid is unstable and the difference value between the current direct current commutation frequency and the fourth preset threshold is smaller than or equal to the fifth preset threshold, directly reducing the current direct current power according to a preset power regulation strategy, and returning to the step 1.
preferably, wherein the method further comprises:
And when the first check result indicates that the power grid is unstable and the set current direct current phase change frequency is a fifth preset threshold value, adjusting the operation mode of the alternating current-direct current hybrid power grid, and returning to the step 1.
preferably, the determining the operation mode of the ac/dc/ac hybrid power grid includes:
And determining the direct current power level of the alternating current-direct current hybrid power grid, the alternating current section power of the transmitting end power grid, the alternating current section power of the receiving end power grid and the power generation load.
according to another aspect of the invention, a system for determining an extra-high voltage direct current commutation failure accelerated protection strategy is provided, and the system comprises:
The setting unit is used for determining the operation mode of the alternating current-direct current hybrid power grid and setting the current direct current commutation times;
the first checking result obtaining unit is used for checking the stability of the alternating current-direct current hybrid power grid to obtain a first checking result when the number of times of phase change failure of the alternating current-direct current hybrid power grid continuously occurs is the current number of times of direct current phase change and no locking occurs after the last phase change failure;
a second calibration result obtaining unit, configured to, when the first calibration result indicates that the power grid is unstable, when the number of times of phase change failure of the ac/dc hybrid power grid continuously occurs is a current number of times of dc phase change and locking occurs after a last phase change failure, calibrate stability of the ac/dc hybrid power grid to obtain a second calibration result;
the protection strategy determining unit is used for determining a protection strategy corresponding to the current direct current power when the current second check result indicates that the power grid is stable; the protection strategy corresponding to the current direct current power is as follows: the maximum value of the continuous commutation failure times which can be borne by the current direct-current power is the difference value between the current direct-current commutation failure times and a first preset threshold, and locking occurs when the continuous commutation failure times are the current direct-current commutation times, and the alternating-current and direct-current series-parallel power grid can be kept to operate safely and stably after locking occurs.
Preferably, wherein the system further comprises:
And the direct current commutation frequency updating unit is used for updating the continuous commutation failure frequency if the current continuous commutation failure frequency is smaller than a second preset threshold when the first check result indicates that the power grid is stable, taking the sum of the current continuous commutation failure frequency and a third preset threshold as the updated direct current commutation frequency, and entering the first check result obtaining unit.
preferably, the protection policy determining unit is further configured to:
And when the first check result indicates that the power grid is stable, if the current number of the phase change failure continuously occurs is equal to a second preset threshold value, directly determining a protection strategy corresponding to the current direct current power.
Preferably, the second check result obtaining unit further includes:
And when the current second check result indicates that the power grid is unstable, and the difference value between the current continuous phase commutation failure times and the fourth preset threshold value is larger than the fifth preset threshold value, taking the difference value between the current continuous phase commutation failure times and the fourth preset threshold value as the updated direct current phase commutation times, and checking the power grid stability when the alternating current-direct current hybrid power grid is locked after the last phase commutation failure, so as to obtain the second check result again.
preferably, wherein the system further comprises:
and the direct current power adjusting unit is used for adjusting the operation mode of the alternating current-direct current hybrid power grid and entering the setting unit when the second check result indicates that the power grid is unstable and the difference value between the current direct current commutation frequency and a fourth preset threshold is less than or equal to a fifth preset threshold.
Preferably, wherein the system further comprises:
And the direct current power adjusting unit is used for directly reducing the current direct current power according to a preset power adjusting strategy when the first check result indicates that the power grid is unstable and the set current direct current commutation frequency is a fifth preset threshold value, and entering the setting unit.
preferably, the setting unit determines an operation mode of the ac/dc/ac hybrid power grid, and includes:
and determining the direct current power level of the alternating current-direct current hybrid power grid, the alternating current section power of the transmitting end power grid, the alternating current section power of the receiving end power grid and the power generation load.
the invention provides a method and a system for determining an extra-high voltage direct current commutation failure accelerated protection strategy, wherein the method comprises the following steps: determining the operation mode of an alternating current-direct current hybrid power grid, and setting the current direct current phase change frequency as a first preset frequency threshold; when the number of continuous phase change failure times of the alternating-current and direct-current hybrid power grid is the current direct-current phase change times and no locking occurs after the last phase change failure, checking the stability of the alternating-current and direct-current hybrid power grid to obtain a first checking result; when the first check result indicates that the power grid is unstable, when the number of times of phase change failure of the alternating-current and direct-current hybrid power grid is continuously equal to the current number of times of direct-current phase change and locking occurs after the last phase change failure, checking the stability of the alternating-current and direct-current hybrid power grid to obtain a second check result; when the current second check result indicates that the power grid is stable, determining that the maximum value of the continuous commutation failure times which can be borne by the current direct-current power is the difference value between the current direct-current commutation failure times and a first preset threshold value according to a protection strategy corresponding to the current direct-current power, and locking when the continuous commutation failure times are the current direct-current commutation times, wherein the alternating-current and direct-current hybrid power grid can keep safe and stable operation after locking. The method for determining the direct-current commutation failure protection strategy of the large alternating-current and direct-current series-parallel power grid is simple and easy to implement, and can obviously improve the calculation efficiency and save the cost of manpower, material resources and the like in the direct-current commutation failure calculation.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
Fig. 1 is a schematic diagram of a checking process of a protection strategy for guaranteeing the direct current commutation failure of the safe and stable operation of a large-scale alternating current-direct current hybrid power grid;
FIG. 2(a) is a diagram showing the bipolar power change after 2 consecutive phase commutation failures;
FIG. 2(b) is a diagram showing the bipolar power change at the 3 rd time of latch-up after 2 consecutive commutation failures in DC;
FIG. 3(a) is a graph of the change of DC unipolar power after 2 consecutive commutation failures;
FIG. 3(b) is a DC unipolar power variation graph after 3 consecutive commutation failures;
FIG. 4 is a flowchart of a method 400 for determining an extra-high voltage DC commutation failure accelerated protection strategy according to an embodiment of the present invention;
Fig. 5 is a diagram illustrating an example of a method for determining an ac/dc hybrid power grid dc commutation failure accelerated protection strategy according to an embodiment of the present invention; and
Fig. 6 is a schematic structural diagram of a system 600 for determining an extra-high voltage direct current commutation failure accelerated protection strategy according to an embodiment of the present invention.
Detailed Description
the exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 4 is a flowchart of a method 400 for determining an extra-high voltage dc commutation failure accelerated protection strategy according to an embodiment of the present invention. As shown in fig. 4, the method for determining the large-scale ac/dc hybrid power grid dc commutation failure protection strategy provided by the embodiment of the present invention is simple and easy to implement, and can significantly improve the calculation efficiency in the dc commutation failure calculation, and save the costs of manpower and material resources, etc. The method 400 for determining the extra-high voltage direct current commutation failure accelerated protection strategy provided by the embodiment of the invention starts from step 401, determines the operation mode of the alternating current and direct current series-parallel power grid in step 401, and sets the current direct current commutation times.
preferably, the determining the operation mode of the ac/dc/ac hybrid power grid includes:
And determining the direct current power level of the alternating current-direct current hybrid power grid, the alternating current section power of the transmitting end power grid, the alternating current section power of the receiving end power grid and the power generation load.
in the embodiment of the present invention, when performing the dc commutation failure calculation, it is necessary to determine the dc power level P0, the transmitting-end grid ac section power, the receiving-end grid ac section power, the power generation load, and the like so that the ac/dc hybrid grid is in an operating state.
for setting the number of dc commutation times, since 2 commutation failures are checked at least, the minimum value of the current set number of dc commutation times may be 2, and is generally 3.
In step 402, when the number of times of phase change failure of the ac/dc hybrid grid continuously occurs is the current number of times of dc phase change and no locking occurs after the last phase change failure, the stability of the ac/dc hybrid grid is checked to obtain a first check result.
In step 403, when the first check result indicates that the power grid is unstable, when the number of times of phase change failure of the ac/dc hybrid power grid continuously occurs is the current number of times of dc phase change and locking occurs after the last phase change failure, checking the stability of the ac/dc hybrid power grid to obtain a second check result.
Preferably, wherein the method further comprises:
when the first check result indicates that the power grid is stable, if the current number of consecutive phase commutation failures is smaller than a second preset threshold, updating the number of consecutive phase commutation failures, taking the sum of the current number of consecutive phase commutation failures and a third preset threshold as the updated number of direct current phase commutation failures, and returning to step 402.
preferably, wherein the method further comprises:
And when the first check result indicates that the power grid is stable, if the current number of the phase change failure continuously occurs is equal to a second preset threshold value, directly determining a protection strategy corresponding to the current direct current power.
for the existing alternating current and direct current power grid, 12 commutation failures are checked at most, 2 commutation failures are checked at least, and checking is performed in sequence according to the number of the commutation failures during each checking. Therefore, in the embodiment of the present invention, the first preset threshold is set to be 1, the second preset threshold is set to be 12, the third preset number threshold is set to be 1, the fourth preset threshold is set to be 1, and the fifth preset threshold is set to be 2.
In the embodiment of the invention, the phase commutation failure N +1 is used to indicate that the locking occurs after N +1 phase commutation failures.
For example, if the current number of times of dc commutation is set to 3, a first check result when commutation failure occurs 3 times and no latch-up occurs after the last commutation failure is obtained first, and then the first check result is determined. And if the first check result indicates that the alternating current-direct current hybrid power grid is unstable, checking the stability of the power grid when the alternating current-direct current hybrid power grid is locked after the 3 rd commutation failure for 3 times of continuous commutation failures, namely 'commutation failure 2+ 1', and acquiring a second check result.
And if the first check result indicates that the alternating-current/direct-current hybrid power grid is stable, and the current continuous commutation failure times 3 are smaller than a second preset threshold value 12, updating the continuously occurring commutation failure times, adding 1 to the current continuous commutation failure times 3 to obtain 4 serving as the updated direct-current commutation times, and returning to the step 402.
For example, if the current number of dc commutations is set to 12. First checking results when 12 commutation failures occur and no locking occurs after the last commutation failure are obtained, and then the first checking results are judged.
And if the first check result indicates that the alternating current-direct current hybrid power grid is unstable, checking phase commutation failure 11+1, namely locking direct current when 12 th phase commutation failure occurs after 11 continuous phase commutation failures occur, and acquiring a second check result.
If the first check result indicates that the alternating-current/direct-current hybrid power grid is stable, and the current continuous phase change failure times 12 are equal to the second preset threshold 12, it indicates that the current phase change failure times reach the maximum value, and therefore the protection strategy corresponding to the current direct-current power is directly determined.
preferably, wherein the method further comprises:
and when the first check result indicates that the power grid is unstable and the set current direct-current commutation frequency is a fifth preset threshold, directly reducing the current direct-current power according to a preset power regulation strategy, and returning to the step 401.
For example, if the current dc commutation frequency is set to 2, and the first check result at this time indicates that the power grid is unstable, the current dc power is directly reduced according to the preset power adjustment strategy, and step 401 is returned to perform commutation failure check according to the reduced dc power, so as to determine the protection strategy corresponding to the reduced dc power.
in step 404, when the current second check result indicates that the power grid is stable, determining a protection strategy corresponding to the current direct current power; the protection strategy corresponding to the current direct current power is as follows: the maximum value of the continuous commutation failure times which can be borne by the current direct-current power is the difference value between the current direct-current commutation failure times and a first preset threshold, and locking occurs when the continuous commutation failure times are the current direct-current commutation times, and the alternating-current and direct-current series-parallel power grid can keep safe and stable operation after locking.
For example, when the first preset threshold is 1, if the current number of direct-current commutation times is 11, after "commutation failure 10+ 1" is performed on the alternating-current/direct-current hybrid power grid, it is determined that the second check result indicates that the power grid is stable, and then it is determined that the protection strategy corresponding to the current direct-current power is: the maximum value of the continuous commutation failure times which can be borne by the current direct-current power is 10, the locking is generated when the continuous commutation failure times are the 11 th time, and the AC-DC hybrid power grid can keep safe and stable operation after the locking is generated.
preferably, wherein the method further comprises:
And when the current second check result indicates that the power grid is unstable, and the difference value between the current continuous phase commutation failure times and the fourth preset threshold value is larger than the fifth preset threshold value, taking the difference value between the current continuous phase commutation failure times and the fourth preset threshold value as the updated direct current phase commutation times, and checking the power grid stability when the alternating current-direct current hybrid power grid is locked after the last phase commutation failure, so as to obtain the second check result again.
Preferably, wherein the method further comprises:
And when the second check result indicates that the power grid is unstable and the difference value between the current direct current commutation frequency and the fourth preset threshold is smaller than or equal to a fifth preset threshold, adjusting the operation mode of the alternating current-direct current hybrid power grid, and returning to the step 401.
for example, if the current number of direct-current commutation times is 11, after "commutation failure 10+ 1" is performed on the alternating-current/direct-current hybrid power grid, it is determined that the second check result indicates that the power grid is unstable, and the value 10 obtained by subtracting 1 from the current number of direct-current commutation times is greater than 2, 10 obtained by subtracting 1 from the current number of continuously-occurring commutation failures is used as the updated number of direct-current commutation times, and the number of continuously-occurring commutation failure times of the alternating-current/direct-current hybrid power grid is 9, and the power grid stability when locking occurs after the 10 th commutation failure is checked, so as to obtain the second check result again; and determining whether to continue checking or directly determine a protection strategy or reduce the current direct current power according to the power grid stability indicated by the second checking result.
And when the second check result indicates that the stability of the power grid is stable, directly determining a protection strategy.
when the second check result indicates that the power grid stability is unstable, and the difference value between the current continuous phase commutation failure times and the fourth preset threshold is larger than the fifth preset threshold, taking the difference value between the current continuous phase commutation failure times and the fourth preset threshold as the updated direct current phase commutation times, subtracting 1 from the current direct current phase commutation failure times of the alternating current-direct current hybrid power grid, and checking the power grid stability when locking occurs after the phase commutation failure again, so as to obtain the second check result again and continue checking.
when the second check result indicates that the power grid stability is unstable, and the value obtained by subtracting 1 from the current direct-current commutation frequency is less than or equal to 2, that is, the current direct-current commutation frequency is 3, it indicates that the second check result is 2 nd commutation failure, and the power grid stability is unstable when locking occurs after the third commutation failure, and then the current direct-current power is reduced.
fig. 5 is a diagram illustrating an example of a method for determining an ac/dc hybrid grid dc commutation failure accelerated protection strategy according to an embodiment of the present invention. As shown in fig. 5, in the real-time method of the present invention, the first preset time threshold is set to be 2, and the second preset time threshold is set to be 12, which is an optimal implementation manner, at this time, the step of determining the ac/dc hybrid grid dc commutation failure accelerated protection strategy includes the following steps:
step 1, selecting a basic operation mode of a power grid, determining a direct current power level P0, a transmitting end power grid alternating current section power, a receiving end power grid alternating current section power and a power generation load, and performing initialization setting on direct current phase change times according to a first preset time threshold 3.
And 2, checking the direct current commutation failure.
specifically, the step includes 10 small steps, where the grid stability check flow in each step includes stability check of the transmitting-end grid and the receiving-end grid shown in fig. 1. The method comprises the following specific steps:
(1) and checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after the direct current 2-time phase commutation failure.
if the power grid is unstable after the direct current 2-time commutation failure, the direct current power is directly reduced according to a preset power regulation strategy, and then the check is continued;
if the power grid is stable after 2 times of direct current commutation failures, 3 times of commutation failure checks are carried out;
if the power grid is unstable after 3 times of direct current commutation failure, checking 'commutation failure 2+ 1', namely locking direct current when 3 rd commutation failure occurs after 2 times of continuous commutation failure, if the power grid is stable after 2+1 'commutation failure, entering step 3, and if the power grid is unstable after 2+ 1' commutation failure, continuing checking after reducing direct current power according to a preset power regulation strategy;
and if the power grid is stable after 3 times of direct current commutation failures, checking the stability of the large alternating current and direct current series-parallel power grid after 4 times of direct current commutation failures.
(2) And checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after the direct current commutation fails for 4 times.
If the power grid is stable after 4 times of direct current commutation failures, entering the step (3);
if the power grid is unstable after 4 times of direct current commutation failures, checking the commutation failure 3+1, and if the power grid is stable after the commutation failure 3+1, entering the step 3; and if the power grid is unstable after the phase change failure is 3+1, continuing checking the phase change failure 2+1, and checking the flow after the phase change failure 2+1 in the step (1).
(3) And checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after the direct current phase commutation fails for 5 times.
If the power grid is stable after the direct current phase change fails for 5 times, entering the step (4);
if the power grid is unstable after the direct current phase change fails for 5 times, checking that the phase change fails for 4+1, and if the power grid is stable after the phase change fails for 4+1, entering the step 3; and if the power grid is unstable after the phase change failure is 4+1, continuing checking the phase change failure 3+1, and checking the flow after the phase change failure 3+1 in the step (2).
(4) and checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after the direct current phase commutation fails for 6 times.
if the power grid is stable after the direct current phase change fails for 6 times, entering the step (5);
If the power grid is unstable after the direct current phase change fails for 6 times, checking that the phase change fails for 5+1, and if the power grid is stable after the phase change fails for 5+1, entering the step 3; and if the power grid is unstable after the phase change failure is 5+1, continuing checking the phase change failure 4+1, and checking the flow after the phase change failure 4+1 in the step (3).
(5) And checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after 7 times of direct current commutation failure.
If the power grid is stable after 7 times of direct current commutation failures, entering the step (6);
If the power grid is unstable after 7 times of direct current commutation failures, checking that the commutation failures are 6+1, and if the power grid is stable after 6+1 commutation failures, entering step 3; and if the power grid is unstable after the phase change failure is 6+1, continuing checking the phase change failure 5+1, and checking the flow after the phase change failure 5+1 in the step (4).
(6) and checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after the direct current phase commutation fails for 8 times.
if the power grid is stable after the direct current phase commutation fails for 8 times, entering the step (7);
if the power grid is unstable after the direct current phase commutation fails for 8 times, checking that the phase commutation fails for 7+1, and if the power grid is stable after the phase commutation fails for 7+1, entering the step 3; and if the power grid is unstable after the phase change failure is 7+1, continuing checking the phase change failure 6+1, and checking the flow after the phase change failure 6+1 in the step (5).
(7) And checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after the direct current 9-time phase commutation failure.
If the power grid is stable after the direct current phase commutation fails for 9 times, entering the step (8);
If the power grid is unstable after the direct current phase commutation fails for 9 times, checking that the phase commutation fails to 8+1, and if the power grid is stable after the phase commutation fails to 8+1, entering the step 3; and if the power grid is unstable after the phase change failure is 8+1, continuing checking the phase change failure 7+1, and checking the flow after the phase change failure 7+1 in step (6).
(8) and checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after the direct current commutation fails for 10 times.
if the power grid is stable after 10 direct current commutation failures, entering the step (9);
If the power grid is unstable after 10 times of direct current commutation failures, checking that the commutation failures are 9+1, and if the power grid is stable after 9+1, entering step 3; and if the power grid is unstable after the phase change failure is 9+1, continuing checking the phase change failure 8+1, and checking the flow after the phase change failure 8+1 in the step (7).
(9) and checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after 11 times of direct current commutation failures.
If the power grid is stable after 11 times of direct current commutation failures, entering the step (10);
if the power grid is unstable after 11 times of direct current commutation failures, checking the commutation failures 10+1, and if the power grid is stable after 10+1 commutation failures, entering the step 3; and if the power grid is unstable after the phase change failure is 10+1, continuing checking the phase change failure 9+1, and checking the flow after the phase change failure 9+1 in the step (8).
(10) And checking the stability of the large-scale alternating current and direct current series-parallel connection power grid after 12 direct current commutation failures.
if the power grid is stable after 12 direct current commutation failures, entering step 3; if the power grid is unstable after 12 times of direct current commutation failures, checking the commutation failure 11+1, and if the power grid is stable after 11+1 commutation failures, entering the step 3; if the power grid is unstable after the phase change failure is 11+1, continuing to check the phase change failure 10+1, and the check process after the phase change failure 10+1 is shown in the step (9);
And 3, determining a commutation failure protection strategy corresponding to the current direct-current power.
in the embodiment of the present invention, if the power grid is stable after the direct current phase commutation failure i +1, the direct current limit is given direct current power, and within the range of the direct current limit, the direct current can bear i times of commutation failures at maximum, and the direct current protection strategy is defined as: the direct current bears i continuous commutation failures at maximum, and the (i + 1) th locking is carried out; if the power grid is stable after the number of commutation failure times i of the direct current is 12, the direct current limit is given direct current power, the direct current can bear 12 commutation failures at maximum in the range of the direct current limit, and the direct current protection strategy is as follows: the maximum DC withstand is 11 consecutive commutation failures, 12 th latch-up.
fig. 6 is a schematic structural diagram of a system 600 for determining an extra-high voltage direct current commutation failure accelerated protection strategy according to an embodiment of the present invention. As shown in fig. 6, a system 600 for determining an ac-dc hybrid grid dc commutation failure accelerated protection strategy according to an embodiment of the present invention includes: a setting unit 601, a first check result acquisition unit 602, a second check result acquisition unit 603, and a protection policy determination unit 604.
Preferably, the setting unit 601 is configured to determine an operation mode of the ac-dc hybrid power grid, and set the current number of dc phase changes to be a first preset number threshold.
Preferably, the determining, by the setting unit 601, an operation mode of the ac/dc/ac hybrid grid includes:
And determining the direct current power level of the alternating current-direct current hybrid power grid, the alternating current section power of the transmitting end power grid, the alternating current section power of the receiving end power grid and the power generation load.
preferably, the first check result obtaining unit 602 is configured to check the stability of the ac/dc hybrid power grid to obtain a first check result when the number of consecutive phase change failures of the ac/dc hybrid power grid is the current number of dc phase change and no blocking occurs after the last phase change failure.
Preferably, the second calibration result obtaining unit 603 is configured to, when the first calibration result indicates that the power grid is unstable, check the stability of the ac/dc hybrid power grid when the number of times of phase change failure of the ac/dc hybrid power grid continuously occurs is the current number of times of dc phase change and locking occurs after the last phase change failure, so as to obtain a second calibration result.
Preferably, the second check result obtaining unit further includes: and when the current second check result indicates that the power grid is unstable, and the difference value between the current continuous phase commutation failure times and the fourth preset threshold value is larger than the fifth preset threshold value, taking the difference value between the current continuous phase commutation failure times and the fourth preset threshold value as the updated direct current phase commutation times, subtracting 1 from the current direct current phase commutation failure times of the alternating current-direct current hybrid power grid, and checking the power grid stability when locking occurs after the phase commutation failure again so as to obtain the second check result again.
Preferably, the protection policy determining unit 604 is configured to determine a protection policy corresponding to the current dc power when the current second calibration result indicates that the power grid is stable; the protection strategy corresponding to the current direct current power is as follows: the maximum value of the continuous commutation failure times which can be borne by the current direct-current power is the difference value between the current direct-current commutation failure times and a first preset threshold, locking occurs when the continuous commutation failure times are the current direct-current commutation failure times, and the alternating-current and direct-current series-parallel power grid can keep safe and stable operation after the locking occurs.
Preferably, the protection policy determining unit 604 is further configured to: and when the first check result indicates that the power grid is stable, if the current continuous phase commutation failure occurrence frequency is equal to a second preset threshold value, directly determining a protection strategy corresponding to the current direct current power.
Preferably, wherein the system further comprises: and a dc commutation frequency updating unit, configured to update the number of consecutive commutation failures if the current number of consecutive commutation failures is smaller than a second preset threshold when the first check result indicates that the power grid is stable, use the sum of the current number of consecutive commutation failures and a third preset threshold as the updated dc commutation frequency, and enter the first check result obtaining unit 602.
Preferably, wherein the system further comprises: and the direct current power adjusting unit is used for directly reducing the current direct current power according to a preset power adjusting strategy when the second check result indicates that the power grid is unstable and the difference value between the current direct current commutation frequency and the fourth preset threshold is less than or equal to the fifth preset threshold, and entering the setting unit.
Preferably, wherein the system further comprises: and the direct current power adjusting unit is used for adjusting the operation mode of the alternating current-direct current hybrid power grid and entering the setting unit when the first check result indicates that the power grid is unstable and the set current direct current commutation frequency is a fifth preset threshold value.
The system 600 for determining the extra-high voltage dc commutation failure accelerated protection strategy according to the embodiment of the present invention corresponds to the method 400 for determining the extra-high voltage dc commutation failure accelerated protection strategy according to another embodiment of the present invention, and is not described herein again.
the invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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 has been 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 examples are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above examples, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (14)
1. A method for determining an extra-high voltage direct current commutation failure accelerated protection strategy is characterized by comprising the following steps:
Step 1, determining an operation mode of an alternating current-direct current hybrid power grid, and setting the current direct current commutation times;
Step 2, when the number of times of phase change failure of the alternating-current and direct-current hybrid power grid is continuously equal to the current number of times of direct-current phase change and no locking occurs after the last phase change failure, checking the stability of the alternating-current and direct-current hybrid power grid to obtain a first checking result;
Step 3, when the first check result indicates that the power grid is unstable, when the number of times of phase change failure of the alternating-current and direct-current hybrid power grid is continuously equal to the current number of times of direct-current phase change and locking occurs after the last phase change failure, checking the stability of the alternating-current and direct-current hybrid power grid to obtain a second check result;
Step 4, when the current second check result indicates that the power grid is stable, determining a protection strategy corresponding to the current direct current power; the protection strategy corresponding to the current direct current power is as follows: the maximum value of the continuous commutation failure times which can be borne by the current direct-current power is the difference value between the current direct-current commutation failure times and a first preset threshold, and locking occurs when the continuous commutation failure times are the current direct-current commutation times, and the alternating-current and direct-current series-parallel power grid can keep safe and stable operation after locking.
2. The method of claim 1, further comprising:
And when the first check result indicates that the power grid is stable, if the current continuous phase commutation failure times are smaller than a second preset threshold, updating the continuous phase commutation failure times, taking the sum of the current continuous phase commutation failure times and a third preset threshold as the updated direct-current phase commutation times, and returning to the step 2.
3. The method of claim 1, further comprising:
and when the first check result indicates that the power grid is stable, if the current continuous phase commutation failure occurrence frequency is equal to a second preset threshold value, directly determining a protection strategy corresponding to the current direct current power.
4. The method of claim 1, further comprising:
And when the current second check result indicates that the power grid is unstable, and the difference value between the current continuous phase commutation failure times and the fourth preset threshold value is larger than the fifth preset threshold value, taking the difference value between the current continuous phase commutation failure times and the fourth preset threshold value as the updated direct current phase commutation times, and checking the power grid stability when the alternating current-direct current hybrid power grid is locked after the last phase commutation failure, so as to obtain the second check result again.
5. The method of claim 1, further comprising:
And when the second check result indicates that the power grid is unstable and the difference value between the current direct current commutation frequency and the fourth preset threshold is smaller than or equal to the fifth preset threshold, directly reducing the current direct current power according to a preset power regulation strategy, and returning to the step 1.
6. The method of claim 1, further comprising:
and when the first check result indicates that the power grid is unstable and the set current direct current commutation frequency is a fifth preset threshold value, adjusting the operation mode of the alternating current-direct current hybrid power grid, and returning to the step 1.
7. the method according to claim 1, wherein the determining the operation mode of the AC/DC hybrid power grid comprises:
And determining the direct current power level of the alternating current-direct current hybrid power grid, the alternating current section power of the transmitting-end power grid, the alternating current section power of the receiving-end power grid and the power generation load.
8. A system for determining an extra-high voltage direct current commutation failure accelerated protection strategy is characterized by comprising:
The setting unit is used for determining the operation mode of the alternating current-direct current hybrid power grid and setting the current direct current commutation times;
The first checking result obtaining unit is used for checking the stability of the alternating current-direct current hybrid power grid to obtain a first checking result when the number of times of phase change failure of the alternating current-direct current hybrid power grid continuously occurs is the current number of times of direct current phase change and no locking occurs after the last phase change failure;
A second calibration result obtaining unit, configured to, when the first calibration result indicates that the power grid is unstable, when the number of times of phase change failure of the ac/dc hybrid power grid continuously occurs is a current number of times of dc phase change and locking occurs after a last phase change failure, calibrate stability of the ac/dc hybrid power grid to obtain a second calibration result;
The protection strategy determining unit is used for determining a protection strategy corresponding to the current direct current power when the current second check result indicates that the power grid is stable; the protection strategy corresponding to the current direct current power is as follows: the maximum value of the continuous commutation failure times which can be borne by the current direct-current power is the difference value between the current direct-current commutation failure times and a first preset threshold, and locking occurs when the continuous commutation failure times are the current direct-current commutation times, and the alternating-current and direct-current series-parallel power grid can keep safe and stable operation after locking.
9. The system of claim 8, further comprising:
And the direct current commutation frequency updating unit is used for updating the continuous commutation failure frequency if the current continuous commutation failure frequency is smaller than a second preset threshold when the first check result indicates that the power grid is stable, taking the sum of the current continuous commutation failure frequency and a third preset threshold as the updated direct current commutation frequency, and entering the first check result obtaining unit.
10. The system of claim 8, wherein the protection policy determination unit is further configured to:
And when the first check result indicates that the power grid is stable, if the current continuous phase commutation failure occurrence frequency is equal to a second preset threshold value, directly determining a protection strategy corresponding to the current direct current power.
11. The system of claim 8, wherein the second parity result obtaining unit further comprises:
And when the current second check result indicates that the power grid is unstable, and the difference value between the current continuous phase commutation failure times and the fourth preset threshold value is larger than the fifth preset threshold value, taking the difference value between the current continuous phase commutation failure times and the fourth preset threshold value as the updated direct current phase commutation times, and checking the power grid stability when the alternating current-direct current hybrid power grid is locked after the last phase commutation failure, so as to obtain the second check result again.
12. The system of claim 8, further comprising:
And the direct current power regulating unit is used for directly reducing the current direct current power according to a preset power regulating strategy and entering the setting unit when the second check result indicates that the power grid is unstable and the difference value between the current direct current commutation frequency and the fourth preset threshold is less than or equal to the fifth preset threshold.
13. The system of claim 8, further comprising:
and the direct current power adjusting unit is used for adjusting the operation mode of the alternating current-direct current hybrid power grid and entering the setting unit when the first check result indicates that the power grid is unstable and the set current direct current commutation frequency is a fifth preset threshold value.
14. The system of claim 8, wherein the setting unit determines the operation mode of the AC/DC/AC hybrid power grid, and comprises:
and determining the direct current power level of the alternating current-direct current hybrid power grid, the alternating current section power of the transmitting-end power grid, the alternating current section power of the receiving-end power grid and the power generation load.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113612190A (en) * | 2021-07-29 | 2021-11-05 | 中国电力科学研究院有限公司 | Method and system for executing alternating current line reclosing based on safety margin index |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337840A (en) * | 2013-03-13 | 2013-10-02 | 南方电网科学研究院有限责任公司 | Control method of electromechanical transient model of short-circuit current limiter of large AC/DC interconnected power grid |
| CN105932705A (en) * | 2016-05-19 | 2016-09-07 | 国电南瑞科技股份有限公司 | Emergency control method for high-voltage direct-current continuous commutation failure |
| US20170220408A1 (en) * | 2016-02-01 | 2017-08-03 | International Business Machines Corporation | Interactive multi-level failsafe enablement |
| CN107342630A (en) * | 2017-07-31 | 2017-11-10 | 国电南瑞科技股份有限公司 | A kind of phase modifier emergency control method and system for suppressing the continuous commutation failure of direct current |
| CN107834586A (en) * | 2017-09-29 | 2018-03-23 | 国电南瑞科技股份有限公司 | A kind of more direct current locking policy optimization methods of sending end for considering system frequency and being subjected to ability |
| CN109327037A (en) * | 2017-08-01 | 2019-02-12 | 中国电力科学研究院 | A kind of layer-specific access direct-current commutation failure prevention and control setting method and device |
| CN109510230A (en) * | 2018-12-11 | 2019-03-22 | 国网山东省电力公司电力科学研究院 | A kind of continuous commutation failure suppressing method for HVDC transmission system |
| CN109659964A (en) * | 2017-10-12 | 2019-04-19 | 中国电力科学研究院 | A kind of method and device for preventing direct current locking |
-
2019
- 2019-08-12 CN CN201910739506.7A patent/CN110581564B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337840A (en) * | 2013-03-13 | 2013-10-02 | 南方电网科学研究院有限责任公司 | Control method of electromechanical transient model of short-circuit current limiter of large AC/DC interconnected power grid |
| US20170220408A1 (en) * | 2016-02-01 | 2017-08-03 | International Business Machines Corporation | Interactive multi-level failsafe enablement |
| CN105932705A (en) * | 2016-05-19 | 2016-09-07 | 国电南瑞科技股份有限公司 | Emergency control method for high-voltage direct-current continuous commutation failure |
| CN107342630A (en) * | 2017-07-31 | 2017-11-10 | 国电南瑞科技股份有限公司 | A kind of phase modifier emergency control method and system for suppressing the continuous commutation failure of direct current |
| CN109327037A (en) * | 2017-08-01 | 2019-02-12 | 中国电力科学研究院 | A kind of layer-specific access direct-current commutation failure prevention and control setting method and device |
| CN107834586A (en) * | 2017-09-29 | 2018-03-23 | 国电南瑞科技股份有限公司 | A kind of more direct current locking policy optimization methods of sending end for considering system frequency and being subjected to ability |
| CN109659964A (en) * | 2017-10-12 | 2019-04-19 | 中国电力科学研究院 | A kind of method and device for preventing direct current locking |
| CN109510230A (en) * | 2018-12-11 | 2019-03-22 | 国网山东省电力公司电力科学研究院 | A kind of continuous commutation failure suppressing method for HVDC transmission system |
Non-Patent Citations (2)
| Title |
|---|
| 余尧等: "高压直流输电系统换流器保护分析及研究", 《机电信息》 * |
| 禹佳等: "特高压直流输电系统逆变站换相失败对整流站的影响及其保护配置策略优化建议", 《四川电力技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113612190A (en) * | 2021-07-29 | 2021-11-05 | 中国电力科学研究院有限公司 | Method and system for executing alternating current line reclosing based on safety margin index |
| CN113612190B (en) * | 2021-07-29 | 2023-10-13 | 中国电力科学研究院有限公司 | Method and system for executing reclosing of alternating current line based on safety margin index |
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|---|---|
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