CN105610151B - Extra-high voltage direct current restart simulation optimization method - Google Patents
Extra-high voltage direct current restart simulation optimization method Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention relates to an extra-high voltage direct current restart simulation optimization method, which comprises the following steps: acquiring fault restart actual measurement data of an extra-high voltage direct current single-pole line, and determining restart parameters of the direct current single-pole fault line and the response condition of a key weak section of an alternating current system after the fault; the method comprises the steps that restarting of the extra-high voltage direct-current single-pole fault line is simulated based on a direct-current single-pole fault line restarting parameter, and the response condition of a key weak section of an alternating-current system after the simulated fault is determined; judging whether the error value of the simulation result is greater than the minimum value of the error result; determining an extra-high voltage direct current bipolar fault line restart time sequence based on the optimum restart time sequence of the extra-high voltage direct current unipolar fault line; the method provided by the invention can accurately simulate the restart time sequence after the extra-high voltage direct current fault and the impact characteristics of the extra-high voltage direct current single/double pole restart on the alternating current system, has simple and convenient calculation process and accurate result, and can be used for making an extra-high voltage direct current single/double pole restart strategy and analyzing the safety and stability of the alternating current and direct current hybrid power grid.
Description
Technical Field
The invention relates to the field of operation and control of an electric power system, in particular to an extra-high voltage direct current restart simulation optimization method.
Background
The extra-high voltage direct current transmission line is long, the geographical span is large, and the climate and the terrain along the line are complex, so that the direct current line is very easy to generate transient faults. In order to improve the operation reliability of the direct current line, a direct current line fault restarting function is arranged in the pole control system, and quick restarting after instantaneous fault of the direct current line can be completed. However, the dc restart function is disadvantageous to the system stability while improving the operation reliability of the dc transmission project. On the one hand, when the direct current line is restarted in a fault, whether the direct current line is successful or not, the energy impact accumulated during the fault brings huge threats to the stability of an alternating current system. On the other hand, because the safety control action is generally not triggered during the direct current restart, the restart process directly affects the action time of the safety and stability device after the direct current line fault restart failure, and the direct current restart time sequence under different restart strategies has different impact characteristics on the power grid. In order to make a reasonable extra-high voltage direct current restart strategy and accurately analyze the influence of extra-high voltage direct current restart on an interconnected power grid, a direct current restart time sequence and a direct current restart strategy which are as practical as possible need to be met.
The DC restart sequence mainly comprises two stages, namely a free stage and a DC power ramp stage. At present, the climbing rate of the domestic extra-high voltage direct current power is not mastered, and is related to parameters of a direct current power controller and a direct current running state, although a complete design book has definite direct current restarting power recovery speed, the direct current restarting power cannot meet the design requirement under the actual running working condition, and the direct current restarting power is possibly far slower than the design value, which brings certain difficulty to the safety and stability analysis of a large power grid. In addition, in the direct current restart strategy, particularly the impact degree of matching of different bipolar fault time sequences on the stability of the power grid is different, and the research on the direct current bipolar restart strategy and the influence of the direct current bipolar restart strategy on the stability of the system requires that the ultrahigh voltage direct current bipolar restart the optimal and practical time sequence in succession.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an extra-high voltage direct current restart simulation optimization method, which can accurately simulate the restart time sequence after an extra-high voltage direct current fault and the impact characteristics of extra-high voltage direct current single/double pole restart on an alternating current system, and has the advantages of simple and convenient calculation process and accurate result.
The purpose of the invention is realized by adopting the following technical scheme:
the improvement of an extra-high voltage direct current restart simulation optimization method is that the method comprises the following steps:
(1) acquiring extra-high voltage direct current single-pole line fault restart measured data, and determining direct current single-pole fault line restart parameters and the key weak section response condition of an alternating current system after fault according to the measured data;
(2) simulating the restarting of the extra-high voltage direct current single-pole fault line based on the restarting parameters of the direct current single-pole fault line, and determining the response condition of the key weak section of the simulated fault alternating current system;
(3) judging whether the error value of the simulation result is greater than the minimum error result value, if so, adjusting the dissociation removal duration time of the last restart of the extra-high voltage direct current single-pole fault line and returning to the step (2) until the error value of the simulation result is less than the minimum error result value and obtaining the optimal restart time sequence of the extra-high voltage direct current single-pole fault line, and if not, executing the step (4) to obtain the optimal restart time sequence of the extra-high voltage direct current single-pole fault line;
(4) and determining the restart time sequence of the extra-high voltage direct current bipolar fault line based on the optimal restart time sequence of the extra-high voltage direct current unipolar fault line.
Preferably, in step (1), the dc single-pole fault line restart parameter includes: the system comprises a restart voltage, restart times, dissociation removal duration, low-voltage protection duration, power ramp duration during direct-current restart and latch-up time after restart failure.
Preferably, in the step (1), the response condition of the key weak section of the alternating current system after the measured fault is determined, and the formula is as follows:
in the formula (1), Δ PiFor actually measuring the power fluctuation amount P of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid under the successful impact of the restart of the direct current single-pole fault lineimaxThe maximum value of active power, delta P, of a key weak section in the transient process of restarting a measured direct current single-pole fault line successfullyjFor actually measuring the power fluctuation amount P of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid under the restart failure impact of the direct current single-pole fault linejmaxFor the active power maximum value P of the key weak section in the transient process of restarting failure of the actually measured direct current single-pole fault line0Is the initial active power of the key weak section.
Preferably, in the step (2), the response condition of the key weak section of the simulated fault post-fault alternating current system is determined, and the formula is as follows:
in the formula (2), delta P'iThe power fluctuation amount P 'of weak section of extra-high voltage direct current sending end alternating current power grid in parallel operation in the simulation process under the successful impact of restarting of direct current single-pole fault line'imaxThe active power maximum value delta P 'of a key weak section in the transient process of the restarting success of the direct current single-pole fault line in the simulation process'jThe power fluctuation amount P 'of weak sections of extra-high voltage direct current sending end alternating current power grid parallel operation in the direct current single-pole fault line restart failure impact in the simulation process'jmaxFor shutdown in transient process of restarting failure of direct current single-pole fault line in simulation processMaximum value of active power, P, of weak cross section of key0The initial active power of the key weak section;
determining an error value between the simulated key weak section response condition of the post-fault alternating current system and the actual measured key weak section response condition of the post-fault alternating current system, wherein the formula is as follows:
in the formula (3), δiIn the simulation process, the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the successful impact of the restart of the direct current single-pole fault line'iThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the impact of the restart success of the direct current single-pole fault lineiError value of, deltajIn the simulation process, the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault line'jThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault linejIs detected.
Preferably, in the step (3), an error result minimum value ξ is set, and power fluctuation quantity delta P 'of a weak section of the extra-high voltage direct current transmission end alternating current power grid in parallel operation in the simulation process under the condition of successful restart impact of a direct current single-pole fault line is respectively judged'iThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the impact of the restart success of the direct current single-pole fault lineiError value delta ofiAnd the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault line in the simulation process'jThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault linejError value delta ofjWhether greater than error result minimum ξ;
if not, acquiring a current restarting time sequence of the extra-high voltage direct current single-pole fault line;
if yes, adjusting the dissociation removing duration time of the last restart of the extra-high voltage direct current single-pole fault line until deltaiξ or delta or lessjAnd (5) not more than ξ, and acquiring the restart time sequence of the modified extra-high voltage direct current single-pole fault line.
Preferably, in the step (4), if the alternating current system allows the extra-high voltage direct current bipolar fault line to be restarted simultaneously, the optimal restart timing sequence in the step (3) is used as the restart timing sequence of the extra-high voltage direct current bipolar fault line.
Further, if the alternating current system does not allow the extra-high voltage direct current bipolar fault line to be restarted simultaneously, the optimal restart time sequence in the step (3) is used as a restart time sequence of a first fault pole in the extra-high voltage direct current bipolar fault line, and the time period from the fault moment of the first fault pole to the direct locking moment of a second fault pole in the i-th extra-high voltage direct current bipolar fault line restart simulation is delta TiObtaining the power fluctuation quantity of the weak section of the parallel operation of the extra-high voltage direct-current transmission end alternating-current power grid in the i-th extra-high voltage direct-current bipolar fault line restart simulation under the impact of the restart success or the restart failure of the direct-current bipolar fault line, wherein the delta T isiIf the time is 0ms, the power fluctuation amount formula of an extra-high voltage direct current sending end alternating current power grid parallel operation weak section in the i-th extra-high voltage direct current bipolar fault line restart simulation under the impact of the restart success or restart failure of the direct current bipolar fault line is as follows:
in the formula (4), the reaction mixture is,
the power fluctuation quantity of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid in the i-th extra-high voltage direct current bipolar fault line restart simulation under the impact of the successful restart of the direct current bipolar fault line,
the maximum value of the active power of the key weak section in the transient process of the restart success of the direct current bipolar fault line in the ith-time ultra-high voltage direct current bipolar fault line restart simulation,
the power fluctuation quantity of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid in the i-th extra-high voltage direct current bipolar fault line restart simulation under the restart failure impact of the direct current bipolar fault line,
the maximum value P of the active power of a key weak section in the transient process of restarting failure of the direct current bipolar fault line in the ith ultra-high voltage direct current bipolar fault line restarting simulation0Is the initial active power of a key weak section, wherein i belongs to [1, n ]]N is the total number of restart simulation of the extra-high voltage direct-current bipolar fault line;
if it is
Or
For the maximum value in the n times of restarting simulation of the extra-high voltage direct current bipolar fault line, the delta T is calculatediAnd performing restart simulation on the extra-high voltage direct current bipolar fault line as a time period from the fault moment of the first fault pole in the extra-high voltage direct current bipolar fault line to the direct locking moment of the later fault pole in the extra-high voltage direct current bipolar fault line.
Compared with the closest prior art, the invention has the following beneficial effects:
the invention provides an ultra-high voltage direct current restart simulation optimization method, which can accurately simulate a monopole restart time sequence after an ultra-high voltage direct current fault and analyze the stability characteristic of an alternating current system under direct current restart impact, the proposed practical time sequence for restarting after a bipolar successive fault can be conveniently used for ultra-high voltage direct current bipolar restart strategy analysis, the calculation process is simple and convenient, and the conclusion is reliable.
Drawings
FIG. 1 is a flow chart of an ultra-high voltage DC restart simulation optimization method provided by the present invention;
FIG. 2 is a schematic diagram of a simulation result of restart success of an extra-high voltage direct-current single-pole fault line in the embodiment of the invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an extra-high voltage direct current restart simulation optimization method, as shown in figure 1, comprising the following steps:
(1) acquiring extra-high voltage direct current single-pole line fault restart measured data, and determining direct current single-pole fault line restart parameters and the key weak section response condition of an alternating current system after fault according to the measured data;
the measured data of the fault restart of the extra-high voltage direct current unipolar line can be obtained through a direct current restart test or a post-fault direct current restart recording PMU;
(2) simulating the restarting of the extra-high voltage direct current single-pole fault line based on the restarting parameters of the direct current single-pole fault line, and determining the response condition of the key weak section of the simulated fault alternating current system;
wherein, an electromechanical transient program can be adopted to simulate the restarting of the extra-high voltage direct current single-pole fault line;
(3) judging whether the error value of the simulation result is greater than the minimum error result value, if so, adjusting the dissociation removal duration time of the last restart of the extra-high voltage direct current single-pole fault line and returning to the step (2) until the error value of the simulation result is less than the minimum error result value and obtaining the optimal restart time sequence of the extra-high voltage direct current single-pole fault line, and if not, executing the step (4) to obtain the optimal restart time sequence of the extra-high voltage direct current single-pole fault line;
(4) and determining the restart time sequence of the extra-high voltage direct current bipolar fault line based on the optimal restart time sequence of the extra-high voltage direct current unipolar fault line.
Wherein, in the step (1), the dc single-pole fault line restart parameter includes: the system comprises a restart voltage, restart times, dissociation removal duration, low-voltage protection duration, power ramp duration during direct-current restart and latch-up time after restart failure.
Specifically, in the step (1), the response condition of the key weak section of the alternating current system after the actual measurement fault is determined, and the formula is as follows:
in the formula (1), Δ PiFor actually measuring the power fluctuation amount P of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid under the successful impact of the restart of the direct current single-pole fault lineimaxThe maximum value of active power, delta P, of a key weak section in the transient process of restarting a measured direct current single-pole fault line successfullyjFor actually measuring the power fluctuation amount P of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid under the restart failure impact of the direct current single-pole fault linejmaxFor the active power maximum value P of the key weak section in the transient process of restarting failure of the actually measured direct current single-pole fault line0Is the initial active power of the key weak section.
In the step (2), determining the response condition of the key weak section of the simulated fault post-communication system, wherein the formula is as follows:
in the formula (2), delta P'iThe power fluctuation amount P 'of weak section of extra-high voltage direct current sending end alternating current power grid in parallel operation in the simulation process under the successful impact of restarting of direct current single-pole fault line'imaxThe active power maximum value delta P 'of a key weak section in the transient process of the restarting success of the direct current single-pole fault line in the simulation process'jThe power fluctuation amount P 'of weak sections of extra-high voltage direct current sending end alternating current power grid parallel operation in the direct current single-pole fault line restart failure impact in the simulation process'jmaxThe maximum value P of the active power of a key weak section in the transient process of restarting failure of a direct current single-pole fault line in the simulation process0The initial active power of the key weak section;
determining an error value between the simulated key weak section response condition of the post-fault alternating current system and the actual measured key weak section response condition of the post-fault alternating current system, wherein the formula is as follows:
in the formula (3), δiIn the simulation process, the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the successful impact of the restart of the direct current single-pole fault line'iThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the impact of the restart success of the direct current single-pole fault lineiError value of, deltajIn the simulation process, the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault line'jPower fluctuation quantity delta P 'of weak section running in parallel with actually-measured extra-high voltage direct-current sending end alternating-current power grid under direct-current single-pole fault line restart failure impact'jIs detected.
In the step (3), the minimum value ξ of the error result is set, and the extra-high voltage direct current transmission end alternating current power grid in the simulation process is judged respectivelyPower fluctuation quantity delta P 'of line operation weak section under direct current single-pole fault line restart success impact'iThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the impact of the restart success of the direct current single-pole fault lineiError value delta ofiAnd the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault line in the simulation process'jThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault linejError value delta ofjWhether greater than error result minimum ξ;
if not, acquiring a current restarting time sequence of the extra-high voltage direct current single-pole fault line;
if yes, adjusting the dissociation removing duration time of the last restart of the extra-high voltage direct current single-pole fault line until deltaiξ or delta or lessjAnd (5) not more than ξ, and acquiring the restart time sequence of the modified extra-high voltage direct current single-pole fault line.
In the step (4), if the alternating current system allows the extra-high voltage direct current bipolar fault line to be restarted simultaneously, the optimal restart time sequence in the step (3) is used as the restart time sequence of the extra-high voltage direct current bipolar fault line.
If the alternating current system does not allow the extra-high voltage direct current bipolar fault line to be restarted simultaneously, the optimal restart time sequence in the step (3) is used as a restart time sequence of a first fault pole in the extra-high voltage direct current bipolar fault line, and the time period from the fault moment of the first fault pole to the direct locking moment of a second fault pole in the ith extra-high voltage direct current bipolar fault line restart simulation is delta TiObtaining the power fluctuation quantity of the weak section of the parallel operation of the extra-high voltage direct-current transmission end alternating-current power grid in the i-th extra-high voltage direct-current bipolar fault line restart simulation under the impact of the restart success or the restart failure of the direct-current bipolar fault line, wherein the delta T isiWhen the time is equal to 0ms, the restart of the ultra-high voltage direct current transmission end alternating current power grid in parallel operation weak section in the i-th ultra-high voltage direct current bipolar fault line restart simulation is successful orThe formula of the power fluctuation amount under the restart failure impact is as follows:
in the formula (4), the reaction mixture is,
the power fluctuation quantity of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid in the i-th extra-high voltage direct current bipolar fault line restart simulation under the impact of the successful restart of the direct current bipolar fault line,
the maximum value of the active power of the key weak section in the transient process of the restart success of the direct current bipolar fault line in the ith-time ultra-high voltage direct current bipolar fault line restart simulation,
the power fluctuation quantity of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid in the i-th extra-high voltage direct current bipolar fault line restart simulation under the restart failure impact of the direct current bipolar fault line,
the maximum value P of the active power of a key weak section in the transient process of restarting failure of the direct current bipolar fault line in the ith ultra-high voltage direct current bipolar fault line restarting simulation0Is the initial active power of a key weak section, wherein i belongs to [1, n ]]N is the total number of restart simulation of the extra-high voltage direct-current bipolar fault line;
if it is
Or
For the maximum value in the n times of restarting simulation of the extra-high voltage direct current bipolar fault line, the delta T is calculatediAs the extra-high voltageAnd performing restart simulation on the extra-high voltage direct current bipolar fault line in a time period from the fault moment of the first fault pole to the direct locking moment of the last fault pole in the extra-high voltage direct current bipolar fault line.
Example (b):
selecting a certain loop of extra-high voltage direct current transmission project of a large hydropower base, and selecting the data of the fault of the monopole restart and the bipolar successive restart caused by the short circuit fault of the monopole and the bipolar successive line in the operation process since the extra-high voltage direct current operation according to the direct current restart measured data.
The measured dc restart parameters were: the original voltage is started, the restarting frequency is 2 times, the 1 st deionization lasts for 150ms, the 2 nd deionization lasts for 200ms, the low-voltage protection of a direct-current line lasts for about 150ms, the direct-current power climbing time is about 400ms, and the locking time after the restart failure is negligible.
Selecting a parallel region interconnection tie line of an extra-high voltage direct current sending end system for a key weak section of an alternating current system, wherein the initial operating power is 500MW, and calculating by using the formula (1) to obtain the power fluctuation quantity delta P under the impact of the successful restart and failure fault of the extra-high voltage direct current monopolei、ΔPj2830MW and 3065MW respectively.
The electromechanical transient program adopts PSD-BPA simulation software developed by China institute of Electrical science, the default direct current power recovery time is about 50ms, the simulation result is shown in figure 2, the maximum value of the active power of the key weak alternating current section after the direct current fault is calculated and obtained by using the formula (2) is 2288MW, and the power fluctuation quantity delta P 'of the weak section after the parallel operation of the extra-high voltage direct current transmission end alternating current power grid in the simulation process is successfully impacted by restarting a direct current single-pole fault line'iFor 1788MW, calculating to obtain the power fluctuation error value delta of the key weak section under the successful impact of DC restart by using the formula (3)i208.4%, the minimum allowable error value ξ is selected to be 10%, since | δiIf the value is greater than ξ, the dissociation removal duration time before the 2 nd restart success needs to be modified, and finally the optimal sequence for the ultrahigh voltage direct current single-pole restart success is generated in an iterative mode, wherein the dissociation removal time for the 1 st time is 150ms, the line low-voltage protection time is 150ms, and the dissociation removal time for the 2 nd time is 200ms +350 ms.
Because the impact of the extra-high voltage direct current bipolar simultaneous restarting on an alternating current system is overlarge, the extra-high voltage direct current bipolar simultaneous restarting is not allowed in consideration of the safe operation stability of an alternating current-direct current hybrid system, and only a bipolar sequential restarting strategy can be adopted under the bipolar operation condition; in the direct current bipolar, firstly, one electrode with fault is restarted according to the unipolar optimal restart successful time sequence, the time when the second electrode fault is directly locked is recorded as delta T from the first electrode fault, and the T is obtained by using a formula (4)1Time to T5The power fluctuation amount of the weak section of the extra-high voltage direct current transmission end alternating current power grid in parallel operation in the moment internal simulation process under the successful impact of the restart of the direct current bipolar fault line is shown in table 1, wherein T is1＝0，T2＝150ms，T3＝300ms，T4＝450ms，T5＝600ms；
TABLE 1 amount of power fluctuation under successful impact of restart of direct current bipolar fault line
| Bipolar fault interval/ms | 0 | 150 | 300 | 450 | 600 |
| Maximum power/MW | 4490 | 4510 | 4512 | 4477 | 4350 |
| Amount of fluctuation DeltaP/MW | 3990 | 4010 | 4012 | 3977 | 3850 |
T3When the fluctuation amount corresponding to the moment is maximum, the optimal time sequence for the successive restarting of the extra-high voltage direct current bipolar is as follows: and after the 1 st pole fault, the starting is restarted successfully according to the single-pole optimal restart time sequence, and the 2 nd pole is locked in 300ms after the 1 st pole fault.
Finally, it should be noted that: the above embodiments 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 embodiments, those of ordinary skill in the art should understand 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 (7)
1. An extra-high voltage direct current restart simulation optimization method is characterized by comprising the following steps:
(1) acquiring extra-high voltage direct current single-pole line fault restart measured data, and determining direct current single-pole fault line restart parameters and the key weak section response condition of an alternating current system after fault according to the measured data;
(2) simulating the restarting of the extra-high voltage direct current single-pole fault line based on the restarting parameters of the direct current single-pole fault line, and determining the response condition of the key weak section of the simulated fault alternating current system;
(3) judging whether the error value of the simulation result is greater than the minimum error result value, if so, adjusting the dissociation removal duration time of the last restart of the extra-high voltage direct current single-pole fault line and returning to the step (2) until the error value of the simulation result is less than the minimum error result value and obtaining the optimal restart time sequence of the extra-high voltage direct current single-pole fault line; if not, executing the step (4) to obtain an optimal restarting time sequence of the extra-high voltage direct current single-pole fault line;
(4) determining an extra-high voltage direct current bipolar fault line restart time sequence based on the optimum restart time sequence of the extra-high voltage direct current unipolar fault line;
wherein the error value of the simulation result comprises: power fluctuation quantity delta P 'of weak section of extra-high voltage direct current sending end alternating current power grid in parallel operation in simulation process under direct current single-pole fault line restart success impact'iThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the impact of the restart success of the direct current single-pole fault lineiError value delta ofiAnd the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault line in the simulation process'jThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault linejError value delta ofj。
2. The method of claim 1, wherein in step (1), the dc single pole fault line restart parameters comprise: the system comprises a restart voltage, restart times, dissociation removal duration, low-voltage protection duration, power ramp duration during direct-current restart and latch-up time after restart failure.
3. The method according to claim 1, wherein in the step (1), the formula for determining the response condition of the key weak section of the ac system after the measured fault is as follows:
in the formula (1), Δ PiFor actually measuring extra-high voltage DC sending end AC power grid in parallelPower fluctuation amount P of weak section in direct current single-pole fault line restart successful impactimaxThe maximum value of active power, delta P, of a key weak section in the transient process of restarting a measured direct current single-pole fault line successfullyjFor actually measuring the power fluctuation amount P of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid under the restart failure impact of the direct current single-pole fault linejmaxFor the active power maximum value P of the key weak section in the transient process of restarting failure of the actually measured direct current single-pole fault line0Is the initial active power of the key weak section.
4. The method of claim 1, wherein in the step (2), the simulated key weak section response condition of the fault post-communication system is determined according to the formula:
in the formula (2), delta P'iThe power fluctuation amount P 'of weak section of extra-high voltage direct current sending end alternating current power grid in parallel operation in the simulation process under the successful impact of restarting of direct current single-pole fault line'imaxThe active power maximum value delta P 'of a key weak section in the transient process of the restarting success of the direct current single-pole fault line in the simulation process'jThe power fluctuation amount P 'of weak sections of extra-high voltage direct current sending end alternating current power grid parallel operation in the direct current single-pole fault line restart failure impact in the simulation process'jmaxThe maximum value P of the active power of a key weak section in the transient process of restarting failure of a direct current single-pole fault line in the simulation process0The initial active power of the key weak section;
determining an error value between the simulated key weak section response condition of the post-fault alternating current system and the actual measured key weak section response condition of the post-fault alternating current system, wherein the formula is as follows:
in the formula (3), δiIn the simulation process, the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the successful impact of the restart of the direct current single-pole fault line'iThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the impact of the restart success of the direct current single-pole fault lineiError value of, deltajIn the simulation process, the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault line'jThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault linejIs detected.
5. The method according to claim 1, wherein in the step (3), the minimum error result value ξ is set, and the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation in the simulation process under the successful impact of the restart of the direct current single-pole fault line is judged respectively'iThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the impact of the restart success of the direct current single-pole fault lineiError value delta ofiAnd the power fluctuation quantity delta P 'of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault line in the simulation process'jThe power fluctuation quantity delta P of the weak section of the extra-high voltage direct current sending end alternating current power grid in parallel operation under the restart failure impact of the direct current single-pole fault linejError value delta ofjWhether greater than error result minimum ξ;
if not, acquiring a current restarting time sequence of the extra-high voltage direct current single-pole fault line;
if yes, adjusting the dissociation removing duration time of the last restart of the extra-high voltage direct current single-pole fault line until deltaiξ or delta or lessjAnd (5) not more than ξ, and acquiring the restart time sequence of the modified extra-high voltage direct current single-pole fault line.
6. The method of claim 1, wherein in step (4), if the alternating current system allows the extra-high voltage direct current bipolar fault line to be restarted simultaneously, the optimal restart timing sequence in step (3) is used as the extra-high voltage direct current bipolar fault line restart timing sequence.
7. The method of claim 6, wherein if the AC system does not allow the extra-high voltage DC bipolar fault line to be restarted simultaneously, the optimal restart time sequence in the step (3) is taken as the restart time sequence of the first fault pole in the extra-high voltage DC bipolar fault line, and the time period from the fault time of the first fault pole to the direct locking time of the next fault pole in the restart simulation of the ith extra-high voltage DC bipolar fault line is delta TiObtaining the power fluctuation quantity of the weak section of the parallel operation of the extra-high voltage direct-current transmission end alternating-current power grid in the i-th extra-high voltage direct-current bipolar fault line restart simulation under the impact of the restart success or the restart failure of the direct-current bipolar fault line, wherein the delta T is1If the time is 0ms, the power fluctuation amount formula of an extra-high voltage direct current sending end alternating current power grid parallel operation weak section in the i-th extra-high voltage direct current bipolar fault line restart simulation under the impact of the restart success or restart failure of the direct current bipolar fault line is as follows:
in the formula (4), Δ Pi (i)The power fluctuation quantity of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid in the i-th extra-high voltage direct current bipolar fault line restart simulation under the impact of the successful restart of the direct current bipolar fault line,
the maximum value of the active power of the key weak section in the transient process of the restart success of the direct current bipolar fault line in the ith-time ultra-high voltage direct current bipolar fault line restart simulation,
the power fluctuation quantity of the weak section of the parallel operation of the extra-high voltage direct current sending end alternating current power grid in the i-th extra-high voltage direct current bipolar fault line restart simulation under the restart failure impact of the direct current bipolar fault line,
the maximum value P of the active power of a key weak section in the transient process of restarting failure of the direct current bipolar fault line in the ith ultra-high voltage direct current bipolar fault line restarting simulation0Is the initial active power of a key weak section, wherein i belongs to [1, n ]]N is the total number of restart simulation of the extra-high voltage direct-current bipolar fault line;
if Δ Pi (i)Or
For the maximum value in the n times of restarting simulation of the extra-high voltage direct current bipolar fault line, the delta T is calculatediAnd performing restart simulation on the extra-high voltage direct current bipolar fault line as a time period from the fault moment of the first fault pole in the extra-high voltage direct current bipolar fault line to the direct locking moment of the later fault pole in the extra-high voltage direct current bipolar fault line.
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