CN105610151A - Extra-high voltage direct-current restart simulation optimization method - Google Patents

Abstract

The invention relates to an extra-high voltage direct-current restart simulation optimization method. The method includes the following steps that: extra-high voltage direct-current mono-polar line fault restart actual measurement data are obtained, direct-current mono-polar fault line restart parameters and post-fault alternating current system key weak cross section response condition are determined; extra-high voltage direct-current mono-polar fault line restart is simulated based on the direct-current mono-polar fault line restart parameters, and post-fault alternating current system key weak cross section response condition after simulation is determined; whether the error value of a simulation results is larger than an error result minimum value is judged; and an extra-high voltage direct-current bipolar fault line restart time sequence is determined based on an extra-high voltage direct-current mono-polar fault line optimal restart time sequence. With the method adopted, the impact characteristic of the restart time sequence after an extra-high voltage direct-current fault, and extra-high voltage direct-current mono-polar/bipolar restart on an alternating current system can be accurately simulated. The extra-high voltage direct-current restart simulation optimization method has the advantages of simple and accurate calculation process and accurate results, and can be applied to the formulation of extra-high voltage direct-current mono-polar/bipolar restart strategies and safety and stability analysis of an alternating current/direct current hybrid power grid system.

Description

A kind of extra-high voltage direct-current is restarted simulation optimization method

Technical field

The present invention relates to operation and control of electric power system field, be specifically related to a kind of extra-high voltage direct-current and restart simulation optimization method.

Background technology

Extra-high voltage direct-current is due to transmission line of electricity length, large, the along the line weather and with a varied topography of geographical span, the as easy as rolling off a log generation of DC lineTransient fault. For improving the operational reliability of DC line, in utmost point control system, be provided with DC line fault restart facility,After can completing DC line transient fault, restart fast. But direct current restart facility can in the operation of raising DC transmission engineeringWhen leaning on property, be but disadvantageous to the stability of a system. On the one hand, DC line fault is restarted, no matter success or not, thereforeThe energy impact accumulating during barrier will bring grave danger to AC system stability. On the other hand, due to during direct current restartsGenerally can not trigger peace control action, restart procedure directly affects DC line fault and restarts unsuccessfully moving of rear safety stabilizing devicesDo the time, ordered pair electrical network impact characteristics difference when difference is restarted the lower direct current of strategy and restarted. For formulating rational extra-high voltage direct-current againStart strategy accurate analysis extra-high voltage direct-current and restart the impact on interconnected network, the direct current that need to as far as possible gear to actual circumstances is restartedSequential and direct current are restarted strategy.

Direct current is restarted sequential and is mainly comprised two stages, removes free stage and dc power ramp up. At present, domestic spyHVDC power creep speed is not grasped, and it is relevant with dc power controller parameter and DC operation state, although completeIn design sheets, there is clear and definite direct current to restart power resume speed, but conventionally do not reach designing requirement under actual operating mode, and may be far awayBe much slower than design load, this will bring certain difficulty to security and stability analysis of large power grid. In addition, direct current is restarted in strategy especially twoThe cooperation of utmost point different faults sequential is to grid stability impact degree difference, the bipolar strategy and steady to system of restarting of researching DCImpact qualitatively needs bipolar optimum and the practical sequential of in succession restarting of extra-high voltage direct-current.

Summary of the invention

For the deficiencies in the prior art, the invention provides a kind of extra-high voltage direct-current and restart simulation optimization method, provided by the inventionMethod is restarted sequential and ultra-high DC single/bipolar restarting exchanging system after can comparatively accurately simulating extra-high voltage direct-current faultThe impact characteristics of system, computational process is easy, and result is accurate.

The object of the invention is to adopt following technical proposals to realize:

A kind of extra-high voltage direct-current is restarted simulation optimization method, and its improvements are, comprising:

(1) obtain ultra-high DC single utmost point line fault and restart measured data, and determine direct current list according to described measured dataUtmost point faulty line is restarted the crucial weak section response condition of AC system after parameter and fault;

(2) restarting parameter based on described direct current one pole faulty line restarts and imitates extra-high voltage direct-current one pole faulty lineVery, determine the crucial weak section response condition of AC system after the fault after emulation;

(3) whether the error amount that judges simulation result is greater than error result minimum of a value, if so, adjusts extra-high voltage direct-current one poleWhat faulty line was restarted for the last time goes the free duration and returns to step (2), until the error amount of simulation result is less than mistakePoor result minimum of a value is also obtained extra-high voltage direct-current one pole faulty line optimum and is restarted sequential, and if not, execution step (4), obtainsGet extra-high voltage direct-current one pole faulty line optimum and restart sequential;

(4) restart sequential based on described extra-high voltage direct-current one pole faulty line optimum, determine the bipolar fault wire of extra-high voltage direct-currentSequential is restarted on road.

Preferably, in described step (1), described direct current one pole faulty line is restarted parameter and is comprised: restart voltage, restartNumber of times, power time of climb and restarting unsuccessfully closes afterwards while going free duration, low-voltage variation duration, direct current to restartThe lock time.

Preferably, in described step (1), the crucial weak section response condition of AC system after definite actual measurement fault, formula is:

$\{\begin{array}{c}{\mathrm{\ΔP}}_i=P_{i\max }-P_0\\ {\mathrm{\ΔP}}_j=P_{j\max }-P_0\end{array}---\left(1\right)$

In formula (1), Δ P_iFor the weak section of actual measurement extra-high voltage direct-current sending end AC network paired running is at direct current one pole faulty lineRestart the power waves momentum under successfully impacting, P_imaxFor actual measurement direct current one pole faulty line is restarted successfully in transient process crucialThe active power maximum of weak section, Δ P_jFor the weak section of actual measurement extra-high voltage direct-current sending end AC network paired running is at direct currentOne pole faulty line is restarted the power waves momentum under unsuccessfully impacting, P_jmaxFor actual measurement direct current one pole faulty line is restarted unsuccessfully temporaryThe active power maximum of crucial weak section in state process, P₀For the initial active power of the weak section of key.

Preferably, in described step (2), determine the crucial weak section response condition of AC system after the fault after emulation, public affairsFormula is:

$\left\{\begin{array}{c}{\mathrm{\ΔP}}_i^{\′}=P_{i\max }^{\′}-P_0\\ {\mathrm{\ΔP}}_j^{\′}=P_{j\max }^{\′}-P_0\end{array}\right.---\left(2\right)$

In formula (2), Δ P '_iFor the weak section of extra-high voltage direct-current sending end AC network paired running in simulation process is in the event of direct current one poleBarrier circuit is restarted the power waves momentum under successfully impacting, P '_imaxFor direct current one pole faulty line in simulation process is restarted successfully temporaryThe active power maximum of crucial weak section in state process, Δ P '_jFor extra-high voltage direct-current sending end AC network in simulation process arranged side by sideMove weak section and restart the power waves momentum under unsuccessfully impacting, P ' at direct current one pole faulty line_jmaxFor direct current in simulation processOne pole faulty line is restarted unsuccessfully the active power maximum of crucial weak section in transient process, P₀For the weak section of keyInitial active power;

Determine after the fault after emulation that after the crucial weak section response condition of AC system and actual measurement fault, AC system is crucial weakThe error amount of section response condition, formula is:

$\left\{\begin{array}{c}{\mathrm{\δ}}_i=({\mathrm{\ΔP}}_i^{\′}-{\mathrm{\ΔP}}_i)/P_0\\ {\mathrm{\δ}}_j=({\mathrm{\ΔP}}_j^{\′}-{\mathrm{\ΔP}}_j)/P_0\end{array}\right.---\left(3\right)$

In formula (3), δ_iFor the weak section of extra-high voltage direct-current sending end AC network paired running in simulation process is in the event of direct current one poleBarrier circuit is restarted the power waves momentum Δ P ' under successfully impacting_iWeak disconnected with actual measurement extra-high voltage direct-current sending end AC network paired runningFace is restarted the power waves momentum Δ P under successfully impacting at direct current one pole faulty line_iError amount, δ_jFor extra-high-speed in simulation processThe weak section of straightening stream sending end AC network paired running is restarted the power waves momentum under unsuccessfully impacting at direct current one pole faulty lineΔP′_jRestart unsuccessfully and impact at direct current one pole faulty line with the weak section of actual measurement extra-high voltage direct-current sending end AC network paired runningUnder power waves momentum Δ P_jError amount.

Preferably, in described step (3), step-up error result minimum of a value ξ, judges respectively extra-high voltage direct-current in simulation processThe weak section of sending end AC network paired running is restarted the power waves momentum Δ P ' under successfully impacting at direct current one pole faulty line_iWithThe weak section of actual measurement extra-high voltage direct-current sending end AC network paired running is restarted the merit under successfully impacting at direct current one pole faulty lineRate undulate quantity Δ P_iError amount δ_iWith the weak section of extra-high voltage direct-current sending end AC network paired running in simulation process at direct current listUtmost point faulty line is restarted the power waves momentum Δ P ' under unsuccessfully impacting_jThin with actual measurement extra-high voltage direct-current sending end AC network paired runningWeak section is restarted the power waves momentum Δ P under unsuccessfully impacting at direct current one pole faulty line_jError amount δ_jWhether be greater than error knotFruit minimum of a value ξ;

If not, obtain the current sequential of restarting of extra-high voltage direct-current one pole faulty line;

If so, adjust going the free duration that extra-high voltage direct-current one pole faulty line restarts for the last time, until δ_i≤ ξ orδ_j≤ ξ, and obtain amended extra-high voltage direct-current one pole faulty line and restart sequential.

Preferably, in described step (4), if AC system allows the bipolar faulty line of extra-high voltage direct-current to restart simultaneously,Optimum in step (3) is restarted to sequential and restart sequential as the bipolar faulty line of extra-high voltage direct-current.

Further, if AC system does not allow extra-high voltage direct-current, bipolar faulty line is restarted simultaneously, by step (3)Optimum is restarted the restart sequential of sequential as first fault one utmost point in the bipolar faulty line of extra-high voltage direct-current, makes extra-high voltage the i timeDC bipolar faulty line is restarted the fault moment of first fault one utmost point in emulation to the extremely directly time period in locking moment of rear fault oneFor Δ T_i, obtain the i time bipolar faulty line of extra-high voltage direct-current and restart extra-high voltage direct-current sending end AC network in emulation and transport side by sideThe power waves momentum under unsuccessfully impacting is restarted successfully or restarted to the weak section of row at DC bipolar faulty line, wherein,ΔT_i=0ms, the i time bipolar faulty line of extra-high voltage direct-current restarted extra-high voltage direct-current sending end AC network in emulation and transported side by sideThe power waves momentum formula that the weak section of row is restarted successfully or restarted under unsuccessfully impacting at DC bipolar faulty line is:

$\{\begin{array}{c}{\mathrm{\ΔP}}_i^{\left(i\right)}=P_{i\max }^{\left(i\right)}-P_0\\ {\mathrm{\ΔP}}_j^{\left(i\right)}=P_{j\max }^{\left(i\right)}-P_0\end{array}---\left(4\right)$

In formula (4),Be that the i time bipolar faulty line of extra-high voltage direct-current restarted extra-high voltage direct-current sending end interchange in emulationThe weak section of electrical network paired running is restarted the power waves momentum under successfully impacting at DC bipolar faulty line,It is the i timeThe bipolar faulty line of extra-high voltage direct-current is restarted DC bipolar faulty line in emulation and is restarted successfully in transient process crucial weak disconnectedThe active power maximum of face,Be that the i time bipolar faulty line of extra-high voltage direct-current restarted extra-high voltage direct-current sending end in emulationThe weak section of AC network paired running is restarted the power waves momentum under unsuccessfully impacting at DC bipolar faulty line,BeI the bipolar faulty line of extra-high voltage direct-current restarted DC bipolar faulty line in emulation and restarted unsuccessfully in transient process crucial thinThe active power maximum of weak section, P₀For the initial active power of the weak section of key, wherein, i ∈ [1, n], n is extra-high voltageDC bipolar faulty line is restarted emulation sum;

IfOrThe bipolar faulty line of extra-high voltage direct-current is restarted maximum in emulation for n time, by Δ T_iAs describedIn the bipolar faulty line of extra-high voltage direct-current, the fault moment of first fault one utmost point is to fault after in the bipolar faulty line of described extra-high voltage direct-currentThe time period in one extremely direct locking moment carries out the bipolar faulty line of extra-high voltage direct-current and restarts emulation.

Compared with immediate prior art, the beneficial effect that the present invention has:

A kind of extra-high voltage direct-current provided by the invention is restarted simulation optimization method, can accurately simulate after extra-high voltage direct-current fault singleThe utmost point is restarted sequential and is analyzed accordingly direct current and restart the lower AC system stability characteristic (quality) of impact, after the bipolar successive failure of proposition, opens againMoving practical sequential can be conveniently restarted analysis of strategies for extra-high voltage direct-current is bipolar, and computational process is easy, and conclusion is reliable, by thisThe method that provides of invention both can be used for ultra-high DC single/bipolar and had restarted tactful formulation, also can be used for AC-DC hybrid power grid peaceFull stability analysis.

Brief description of the drawings

Fig. 1 is that a kind of extra-high voltage direct-current provided by the invention is restarted simulation optimization method flow chart;

Fig. 2 is that in the embodiment of the present invention, extra-high voltage direct-current one pole faulty line is restarted successfully simulation result schematic diagram.

Detailed description of the invention

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

For making object, technical scheme and the advantage of the embodiment of the present invention clearer, attached below in conjunction with in the embodiment of the present inventionFigure, is clearly and completely described the technical scheme in the embodiment of the present invention, and obviously, described embodiment is the present inventionPart embodiment, instead of whole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not havingMake all other embodiment that obtain under creative work prerequisite, all belong to the scope of protection of the invention.

The invention provides a kind of extra-high voltage direct-current and restart simulation optimization method, as shown in Figure 1, comprising:

(1) obtain ultra-high DC single utmost point line fault and restart measured data, and determine direct current list according to described measured dataUtmost point faulty line is restarted the crucial weak section response condition of AC system after parameter and fault;

Wherein, described ultra-high DC single utmost point line fault is restarted measured data and can be restarted after test or fault straight by direct currentStream is restarted in record ripple PMU and is obtained;

(2) restarting parameter based on described direct current one pole faulty line restarts and imitates extra-high voltage direct-current one pole faulty lineVery, determine the crucial weak section response condition of AC system after the fault after emulation;

Wherein, can adopt electromechanical transient program to restart and carry out emulation extra-high voltage direct-current one pole faulty line;

(3) whether the error amount that judges simulation result is greater than error result minimum of a value, if so, adjusts extra-high voltage direct-current one poleWhat faulty line was restarted for the last time goes the free duration and returns to step (2), until the error amount of simulation result is less than mistakePoor result minimum of a value is also obtained extra-high voltage direct-current one pole faulty line optimum and is restarted sequential, and if not, execution step (4), obtainsGet extra-high voltage direct-current one pole faulty line optimum and restart sequential;

(4) restart sequential based on described extra-high voltage direct-current one pole faulty line optimum, determine the bipolar fault wire of extra-high voltage direct-currentSequential is restarted on road.

Wherein, in described step (1), described direct current one pole faulty line is restarted parameter and is comprised: restart voltage, restart timeNumber, while going free duration, low-voltage variation duration, direct current to restart power time of climb and restart unsuccessfully after lockingTime.

Concrete, in described step (1), the crucial weak section response condition of AC system after definite actual measurement fault, formula is:

$\{\begin{array}{c}{\mathrm{\ΔP}}_i=P_{i\max }-P_0\\ {\mathrm{\ΔP}}_j=P_{j\max }-P_0\end{array}---\left(1\right)$

In formula (1), Δ P_iFor the weak section of actual measurement extra-high voltage direct-current sending end AC network paired running is at direct current one pole faulty lineRestart the power waves momentum under successfully impacting, P_imaxFor actual measurement direct current one pole faulty line is restarted successfully in transient process crucialThe active power maximum of weak section, Δ P_jFor the weak section of actual measurement extra-high voltage direct-current sending end AC network paired running is at direct currentOne pole faulty line is restarted the power waves momentum under unsuccessfully impacting, P_jmaxFor actual measurement direct current one pole faulty line is restarted unsuccessfully temporaryThe active power maximum of crucial weak section in state process, P₀For the initial active power of the weak section of key.

In described step (2), determine the crucial weak section response condition of AC system after the fault after emulation, formula is:

$\left\{\begin{array}{c}{\mathrm{\ΔP}}_i^{\′}=P_{i\max }^{\′}-P_0\\ {\mathrm{\ΔP}}_j^{\′}=P_{j\max }^{\′}-P_0\end{array}\right.---\left(2\right)$

In formula (2), Δ P '_iFor the weak section of extra-high voltage direct-current sending end AC network paired running in simulation process is in the event of direct current one poleBarrier circuit is restarted the power waves momentum under successfully impacting, P '_imaxFor direct current one pole faulty line in simulation process is restarted successfully temporaryThe active power maximum of crucial weak section in state process, Δ P '_jFor extra-high voltage direct-current sending end AC network in simulation process arranged side by sideMove weak section and restart the power waves momentum under unsuccessfully impacting, P ' at direct current one pole faulty line_jmaxFor direct current in simulation processOne pole faulty line is restarted unsuccessfully the active power maximum of crucial weak section in transient process, P₀For the weak section of keyInitial active power;

Determine after the fault after emulation that after the crucial weak section response condition of AC system and actual measurement fault, AC system is crucial weakThe error amount of section response condition, formula is:

$\left\{\begin{array}{c}{\mathrm{\δ}}_i=({\mathrm{\ΔP}}_i^{\′}-{\mathrm{\ΔP}}_i)/P_0\\ {\mathrm{\δ}}_j=({\mathrm{\ΔP}}_j^{\′}-{\mathrm{\ΔP}}_j)/P_0\end{array}\right.---\left(3\right)$

In formula (3), δ_iFor the weak section of extra-high voltage direct-current sending end AC network paired running in simulation process is in the event of direct current one poleBarrier circuit is restarted the power waves momentum Δ P ' under successfully impacting_iWeak disconnected with actual measurement extra-high voltage direct-current sending end AC network paired runningFace is restarted the power waves momentum Δ P under successfully impacting at direct current one pole faulty line_iError amount, δ_jFor extra-high-speed in simulation processThe weak section of straightening stream sending end AC network paired running is restarted the power waves momentum under unsuccessfully impacting at direct current one pole faulty lineΔP′_jRestart unsuccessfully and impact at direct current one pole faulty line with the weak section of actual measurement extra-high voltage direct-current sending end AC network paired runningUnder power waves momentum Δ P '_jError amount.

In described step (3), step-up error result minimum of a value ξ, judges that respectively in simulation process, extra-high voltage direct-current sending end exchangesThe weak section of electrical network paired running is restarted the power waves momentum Δ P ' under successfully impacting at direct current one pole faulty line_iWith actual measurement extra-high-speedThe weak section of straightening stream sending end AC network paired running is restarted the power waves momentum under successfully impacting at direct current one pole faulty lineΔP_iError amount δ_iWith the weak section of extra-high voltage direct-current sending end AC network paired running in simulation process at direct current one pole fault wireThe power waves momentum Δ P ' under unsuccessfully impacting is restarted on road_jExist with the weak section of actual measurement extra-high voltage direct-current sending end AC network paired runningDirect current one pole faulty line is restarted the power waves momentum Δ P under unsuccessfully impacting_jError amount δ_jWhether be greater than error result minimum of a valueξ；

If not, obtain the current sequential of restarting of extra-high voltage direct-current one pole faulty line;

If so, adjust going the free duration that extra-high voltage direct-current one pole faulty line restarts for the last time, until δ_i≤ ξ orδ_j≤ ξ, and obtain amended extra-high voltage direct-current one pole faulty line and restart sequential.

In described step (4), if AC system allows the bipolar faulty line of extra-high voltage direct-current to restart simultaneously, by step (3)Middle optimum is restarted sequential and is restarted sequential as the bipolar faulty line of extra-high voltage direct-current.

If AC system does not allow extra-high voltage direct-current, bipolar faulty line is restarted simultaneously, optimum in step (3) is restartedSequential, as the sequential of restarting of first fault one utmost point in the bipolar faulty line of extra-high voltage direct-current, makes the i time bipolar event of extra-high voltage direct-currentFault moment to the time period in extremely direct locking moment of rear fault one that barrier circuit is restarted first fault one utmost point in emulation is Δ T_i, obtainGet the i time bipolar faulty line of extra-high voltage direct-current and restart the weak section of extra-high voltage direct-current sending end AC network paired running in emulationRestart successfully or restart the power waves momentum under unsuccessfully impacting at DC bipolar faulty line, wherein, Δ T_i=0ms,I bipolar faulty line of extra-high voltage direct-current restarted in emulation the weak section of extra-high voltage direct-current sending end AC network paired running directlyFlowing the power waves momentum formula that bipolar faulty line restarts successfully or restart unsuccessfully under impacting is:

$\{\begin{array}{c}{\mathrm{\ΔP}}_i^{\left(i\right)}=P_{i\max }^{\left(i\right)}-P_0\\ {\mathrm{\ΔP}}_j^{\left(i\right)}=P_{j\max }^{\left(i\right)}-P_0\end{array}---\left(4\right)$

In formula (4),Be that the i time bipolar faulty line of extra-high voltage direct-current restarted extra-high voltage direct-current sending end interchange in emulationThe weak section of electrical network paired running is restarted the power waves momentum under successfully impacting at DC bipolar faulty line,It is the i timeThe bipolar faulty line of extra-high voltage direct-current is restarted DC bipolar faulty line in emulation and is restarted successfully in transient process crucial weak disconnectedThe active power maximum of face,Be that the i time bipolar faulty line of extra-high voltage direct-current restarted extra-high voltage direct-current sending end in emulationThe weak section of AC network paired running is restarted the power waves momentum under unsuccessfully impacting at DC bipolar faulty line,BeI the bipolar faulty line of extra-high voltage direct-current restarted DC bipolar faulty line in emulation and restarted unsuccessfully in transient process crucial thinThe active power maximum of weak section, P₀For the initial active power of the weak section of key, wherein, i ∈ [1, n], n is extra-high voltageDC bipolar faulty line is restarted emulation sum;

IfOrThe bipolar faulty line of extra-high voltage direct-current is restarted maximum in emulation for n time, by Δ T_iAs describedIn the bipolar faulty line of extra-high voltage direct-current, the fault moment of first fault one utmost point is to fault after in the bipolar faulty line of described extra-high voltage direct-currentThe time period in one extremely direct locking moment carries out the bipolar faulty line of extra-high voltage direct-current and restarts emulation.

Embodiment:

Select certain large-scale Hydropower Base to return extra-high voltage direct-current transmission engineering, direct current is restarted measured data and is chosen this extra-high voltage direct-currentThe one pole that since putting into operation, generation one pole in service and bipolar successive line short trouble cause is restarted and the bipolar fault of in succession restartingData.

The direct current of surveying is restarted parameter: it is to remove the free 150ms of continuing, for 2 times, the 1st time that former pressure starts, restarts number of timesGo for 2 times the free 200ms of continuing, DC line low-voltage variation to continue about 150ms, dc power climbing about 400ms of time, restartAfter failure, blocking time can be ignored.

The crucial weak section selection extra-high voltage direct-current sending of AC system the interconnected interconnection of column region, its initial launch powerFor 500MW, utilize above-mentioned formula (1) to calculate that extra-high voltage direct-current one pole is restarted successfully and the power of failed fault under impactingUndulate quantity Δ P_i、ΔP_jBe respectively 2830MW and 3065MW.

Electromechanical transient program adopts the PSD-BPA simulation software of China Electric Power Research Institute's exploitation, and its acquiescence dc power is recoveredAbout 50ms of time, simulation result as shown in Figure 2, utilizes above-mentioned formula (2) to calculate crucial weak interchange after DC Line FaultThe active power maximum of section is 2288MW, the weak section of extra-high voltage direct-current sending end AC network paired running in simulation processRestart the power waves momentum Δ P ' under successfully impacting at direct current one pole faulty line_iFor 1788MW, utilize formula (3) to calculateRestart and successfully impact lower crucial weak section power waves momentum error amount δ to direct current_iBe 208.4%, select allowable error minimum of a valueξ=10%, due to | δ_i| > ξ, needs amendment to restart for the 2nd time and successfully before goes the free duration, final grey iterative generation extra-high-speed straighteningStream one pole is restarted successfully best sequential: remove free 150ms, circuit low-voltage variation time 150ms for the 1st time, go trip for the 2nd timeFrom the time be 200ms+350ms.

Restart because extra-high voltage direct-current is bipolar simultaneously and AC system is impacted excessive, consider the safe operation of alternating current-direct current combined hybrid systemStability, does not allow that extra-high voltage direct-current is bipolar to be restarted simultaneously, can only take the bipolar strategy of in succession restarting under bipolar ruuning situation;In DC bipolar, first fault one utmost point is restarted successfully sequential according to one pole optimum and is restarted, and the second direct locking moment of utmost point fault is apart from firstUtmost point fault moment is designated as Δ T, utilizes formula (4) to obtain T₁Moment is to T₅In moment, in simulation process, extra-high voltage direct-current sending end exchangesThe weak section of electrical network paired running is restarted the power waves momentum under successfully impacting at DC bipolar faulty line, as shown in table 1,Wherein, T₁＝0，T₂＝150ms，T₃＝300ms，T₄＝450ms，T₅＝600ms；

Table 1 DC bipolar faulty line is restarted the power waves momentum under successfully impacting

Bipolar between-failures/ms	0	150	300	450	600
						Power maximum/MW	4490	4510	4512	4477	4350
Undulate quantity Δ P/MW	3990	4010	4012	3977	3850

T₃The undulate quantity maximum that moment is corresponding, the bipolar optimum timing of in succession restarting successfully of extra-high voltage direct-current is: the 1st utmost point faultAfter restart sequential according to one pole the best and restart successfully, the 300ms locking after the 1st utmost point fault of the 2nd utmost point.

Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although referenceAbove-described embodiment has been described in detail the present invention, and those of ordinary skill in the field are to be understood that: still can be to thisInvention detailed description of the invention modify or be equal to replacement, and do not depart from spirit and scope of the invention any amendment or etc.With replacing, within it all should be encompassed in claim protection domain of the present invention.

Claims (7)

1. extra-high voltage direct-current is restarted a simulation optimization method, it is characterized in that, comprises step:

(1) obtain ultra-high DC single utmost point line fault and restart measured data, and determine direct current list according to described measured dataUtmost point faulty line is restarted the crucial weak section response condition of AC system after parameter and fault;

(2) restarting parameter based on described direct current one pole faulty line restarts and imitates extra-high voltage direct-current one pole faulty lineVery, determine the crucial weak section response condition of AC system after the fault after emulation;

(3) whether the error amount that judges simulation result is greater than error result minimum of a value, if so, adjusts extra-high voltage direct-current one poleWhat faulty line was restarted for the last time goes the free duration and returns to step (2), until the error amount of simulation result is less than mistakePoor result minimum of a value is also obtained extra-high voltage direct-current one pole faulty line optimum and is restarted sequential; If not, execution step (4), obtainsGet extra-high voltage direct-current one pole faulty line optimum and restart sequential;

(4) restart sequential based on described extra-high voltage direct-current one pole faulty line optimum, determine the bipolar fault wire of extra-high voltage direct-currentSequential is restarted on road.

2. the method for claim 1, is characterized in that, in described step (1), and described direct current one pole faulty lineRestarting parameter comprises: restart voltage, restart number of times, while going free duration, low-voltage variation duration, direct current to restartPower time of climb and restart unsuccessfully after blocking time.

3. the method for claim 1, is characterized in that, in described step (1), after definite actual measurement fault, exchanges systemThe formula of the crucial weak section response condition of uniting is:

$\left\{\begin{array}{c}{\mathrm{\ΔP}}_i=P_{i\max }-P_0\\ {\mathrm{\ΔP}}_j=P_{j\max }-P_0\end{array}\right.---\left(1\right)$

In formula (1), Δ P_iFor the weak section of actual measurement extra-high voltage direct-current sending end AC network paired running is at direct current one pole faulty lineRestart the power waves momentum under successfully impacting, P_imaxFor actual measurement direct current one pole faulty line is restarted successfully in transient process crucialThe active power maximum of weak section, Δ P_jFor the weak section of actual measurement extra-high voltage direct-current sending end AC network paired running is at direct currentOne pole faulty line is restarted the power waves momentum under unsuccessfully impacting, P_jmaxFor actual measurement direct current one pole faulty line is restarted unsuccessfully temporaryThe active power maximum of crucial weak section in state process, P₀For the initial active power of the weak section of key.

4. the method for claim 1, is characterized in that, in described step (2), hands over after determining the fault after emulationThe crucial weak section response condition of streaming system, formula is:

$\left\{\begin{array}{c}{\mathrm{\ΔP}}_i^{\′}=P_{i\max }^{\′}-P_0\\ {\mathrm{\ΔP}}_j^{\′}=P_{j\max }^{\′}-P_0\end{array}\right.---\left(2\right)$

In formula (2), Δ P '_iFor the weak section of extra-high voltage direct-current sending end AC network paired running in simulation process is in the event of direct current one poleBarrier circuit is restarted the power waves momentum under successfully impacting, P '_imaxFor direct current one pole faulty line in simulation process is restarted successfully temporaryThe active power maximum of crucial weak section in state process, Δ P '_jFor extra-high voltage direct-current sending end AC network in simulation process arranged side by sideMove weak section and restart the power waves momentum under unsuccessfully impacting, P ' at direct current one pole faulty line_jmaxFor direct current in simulation processOne pole faulty line is restarted unsuccessfully the active power maximum of crucial weak section in transient process, P₀For the weak section of keyInitial active power;

Determine after the fault after emulation that after the crucial weak section response condition of AC system and actual measurement fault, AC system is crucial weakThe error amount of section response condition, formula is:

$\left\{\begin{array}{c}{\mathrm{\δ}}_i=({\mathrm{\ΔP}}_i^{\′}-{\mathrm{\ΔP}}_i)/P_0\\ {\mathrm{\δ}}_j=({\mathrm{\ΔP}}_j^{\′}-{\mathrm{\ΔP}}_j)/P_0\end{array}\right.---\left(3\right)$

In formula (3), δ_iFor the weak section of extra-high voltage direct-current sending end AC network paired running in simulation process is in the event of direct current one poleBarrier circuit is restarted the power waves momentum Δ P ' under successfully impacting_iWeak disconnected with actual measurement extra-high voltage direct-current sending end AC network paired runningFace is restarted the power waves momentum Δ P under successfully impacting at direct current one pole faulty line_iError amount, δ_jFor extra-high-speed in simulation processThe weak section of straightening stream sending end AC network paired running is restarted the power waves momentum under unsuccessfully impacting at direct current one pole faulty lineΔP′_jRestart unsuccessfully and impact at direct current one pole faulty line with the weak section of actual measurement extra-high voltage direct-current sending end AC network paired runningUnder power waves momentum Δ P_jError amount.

5. the method for claim 1, is characterized in that, in described step (3), and step-up error result minimum of a value ξ,Judge that respectively in simulation process, the weak section of extra-high voltage direct-current sending end AC network paired running is restarted at direct current one pole faulty linePower waves momentum Δ P ' under success impact_iWith the weak section of actual measurement extra-high voltage direct-current sending end AC network paired running at direct current one poleFaulty line is restarted the power waves momentum Δ P under successfully impacting_iError amount δ_iExchange with extra-high voltage direct-current sending end in simulation processThe weak section of electrical network paired running is restarted the power waves momentum Δ P ' under unsuccessfully impacting at direct current one pole faulty line_jWith actual measurement extra-high-speedThe weak section of straightening stream sending end AC network paired running is restarted the power waves momentum under unsuccessfully impacting at direct current one pole faulty lineΔP_jError amount δ_jWhether be greater than error result minimum of a value ξ;

If not, obtain the current sequential of restarting of extra-high voltage direct-current one pole faulty line;

If so, adjust going the free duration that extra-high voltage direct-current one pole faulty line restarts for the last time, until δ_i≤ ξ orδ_j≤ ξ, and obtain amended extra-high voltage direct-current one pole faulty line and restart sequential.

6. the method for claim 1, is characterized in that, in described step (4), if AC system allows extra-high voltageDC bipolar faulty line is restarted simultaneously, optimum in step (3) is restarted to sequential as the bipolar fault wire of extra-high voltage direct-currentSequential is restarted on road.

7. method as claimed in claim 6, is characterized in that, if AC system does not allow the bipolar fault wire of extra-high voltage direct-currentRestart simultaneously on road, optimum in step (3) is restarted to sequential first fault one utmost point in the bipolar faulty line of extra-high voltage direct-currentRestart sequential, make fault moment that the i time bipolar faulty line of extra-high voltage direct-current restart first fault one utmost point in emulation to afterExtremely directly the time period in locking moment is Δ T to fault one_i, obtain the i time bipolar faulty line of extra-high voltage direct-current and restart in emulationUnsuccessfully punching is restarted successfully or restarted to the weak section of extra-high voltage direct-current sending end AC network paired running at DC bipolar faulty linePower waves momentum under hitting, wherein, Δ T₁=0ms, the i time bipolar faulty line of extra-high voltage direct-current restarted extra-high-speed in emulationThe weak section of straightening stream sending end AC network paired running is restarted successfully or is restarted under unsuccessfully impact at DC bipolar faulty linePower waves momentum formula be:

$\left\{\begin{array}{c}{\mathrm{\ΔP}}_i^{\left(i\right)}=P_{i\max }^{\left(i\right)}-P_0\\ {\mathrm{\ΔP}}_j^{\left(i\right)}=P_{j\max }^{\left(i\right)}-P_0\end{array}\right.---\left(4\right)$

In formula (4),Be that the i time bipolar faulty line of extra-high voltage direct-current restarted extra-high voltage direct-current sending end interchange in emulationThe weak section of electrical network paired running is restarted the power waves momentum under successfully impacting at DC bipolar faulty line,It is the i timeThe bipolar faulty line of extra-high voltage direct-current is restarted DC bipolar faulty line in emulation and is restarted successfully in transient process crucial weak disconnectedThe active power maximum of face,Be that the i time bipolar faulty line of extra-high voltage direct-current restarted extra-high voltage direct-current sending end in emulationThe weak section of AC network paired running is restarted the power waves momentum under unsuccessfully impacting at DC bipolar faulty line,BeI the bipolar faulty line of extra-high voltage direct-current restarted DC bipolar faulty line in emulation and restarted unsuccessfully in transient process crucial thinThe active power maximum of weak section, P₀For the initial active power of the weak section of key, wherein, i ∈ [1, n], n is extra-high voltageDC bipolar faulty line is restarted emulation sum;

IfOrThe bipolar faulty line of extra-high voltage direct-current is restarted maximum in emulation for n time, by Δ T_iAs describedIn the bipolar faulty line of extra-high voltage direct-current, the fault moment of first fault one utmost point is to fault after in the bipolar faulty line of described extra-high voltage direct-currentThe time period in one extremely direct locking moment carries out the bipolar faulty line of extra-high voltage direct-current and restarts emulation.