CN114336724B - Reactive coordination control method and device for centralized and distributed camera - Google Patents
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Abstract
The invention discloses a reactive coordination control method and device for a centralized and distributed type camera, and belongs to the technical field of power systems and automation thereof. The method comprises the following steps: analyzing the reactive power replacement direct current filter of the centralized type dispatching machine based on the power grid electromechanical simulation data of the T time section in the future to inhibit the transient overvoltage effect of the new energy, and determining a reactive power control strategy of the centralized type dispatching machine; if the reactive power control strategy of the centralized type phase-change machine does not meet the requirement of suppressing the transient overvoltage of the new energy, the reactive power output of each distributed phase-change machine is determined based on the sensitivity of suppressing the transient overvoltage of the new energy by the reactive power control of the distributed phase-change machine at different places, so that the coordination of different types of phase-change machines is realized, the transient overvoltage after the direct current output system faults are collected by the new energy at the transmitting end is suppressed, the coordination capacity of reactive power resources of a power grid is improved, and the remote capacity of the new energy through direct current is promoted.
Description
Technical Field
The invention belongs to the technical field of power systems and automation thereof, and more specifically relates to a reactive coordination control method and device for a centralized and distributed type phase-regulating machine.
Background
At present, wind and solar new energy power generation resources are developed on a large scale and are consumed by an extra-high voltage direct current remote transmission load center, so that the wind and solar new energy power generation resource becomes an important means for converting electric power energy in China, but due to weak voltage withstand capability of the new energy, when faults such as continuous phase change failure and the like occur in direct current, transient overvoltage of the new energy in a near area is easily caused, the risk of large-scale off-grid chain reaction of the new energy exists, and the grid-connected scale and the direct current power transmission capability of the new energy are greatly limited. Compared with dynamic reactive equipment such as SVC, the phase regulator relies on armature flux linkage conservation, is not dependent on measurement and control links, can effectively follow system voltage change, does not have the problem of voltage back regulation, and has been used as an important means for solving the transient overvoltage of new energy after faults such as sending end direct current commutation failure. However, as the scale of new energy bases increases and the direct current power transmission capacity increases, the effect of eliminating the transient overvoltage of the new energy is not obvious by means of adding a new generation of large-sized cameras in a convertor station set, and the transient overvoltage inhibition capacity of the new energy can be effectively improved by adding a distributed small-sized camera at a new energy collection point, so that the new energy is gradually approved and planned in a Qinghai power grid, and the new energy is used for improving the ultra-high voltage direct current power transmission capacity of Qinghai and an important means of new energy in a near-area Hainan.
At present, a new generation of phase-change machines are arranged at the power transmission end direct current converter stations of Qi Shao and the like in China, reactive power output of the phase-change machines is basically considered according to 0 under a static working condition, and certain adjusting capacity can be exerted during a transient state, but the more reactive power is initially sent out by the phase-change machines, the stronger transient state phase-change capacity is, the exertion of the capacity is limited, the improvement of the direct current power transmission capacity is directly influenced, and the resource waste is caused. On the other hand, both theory and practice show that under the same power level of the direct current, the direct current adopts an under-compensation mode to reduce the transient voltage rise compared with an over-compensation mode, so that the transient voltage rise after the fault is reduced by reactive replacement of a regulator and a direct current filter.
Disclosure of Invention
The invention aims to provide a reactive coordination control method for a centralized and distributed type phase-change machine, which is used for inhibiting transient voltage rise of new energy after a direct-current phase-change failure fault and promoting the long-distance direct-current absorption capacity of the new energy by coordinating reactive output of a centralized large-sized phase-change machine and a distributed small-sized phase-change machine.
The invention is realized by adopting the following technical proposal,
the invention provides a reactive coordination control method of a centralized and distributed camera, which comprises the following steps:
based on the electromechanical simulation data of the power grid of the T time section in the future, judging the transient overvoltage of the new energy, and determining the reactive power control strategy of the centralized phase regulator;
if the reactive power control strategy of the centralized type camera does not meet the requirement of suppressing the transient overvoltage of the new energy, calculating the sensitivity of suppressing the transient overvoltage of the new energy by the reactive power control of the distributed type camera;
and suppressing the transient overvoltage sensitivity of the new energy based on the reactive power control of the distributed type camera to perform reactive power control of the distributed type camera.
Further, the power grid electromechanical simulation data based on the future T time section is used for judging the transient overvoltage of the new energy, and determining the reactive power control strategy of the centralized phase-change regulator, which comprises the following steps:
based on the electromechanical simulation data of the power grid of the T time section in the future, simulating and checking whether the transient overvoltage of the near-area new energy occurs after the continuous commutation failure of the direct current of the new energy collecting and transmitting end;
if so, determining the maximum replacement group number of the alternating current filter of the direct current system according to the static reactive power regulation upper limit of the centralized camera and the single-group capacity of the alternating current filter of the direct current system;
sequentially checking the reactive power output of the centralized phase-regulating machine to replace N groups of alternating current filters of the direct current system, and after a direct current continuous phase-change failure fault occurs, obtaining a new energy transient voltage level until the problem of the new energy transient overvoltage is solved or the maximum number of the alternating current filters of the direct current system is reached; wherein n=1, 2 …;
and outputting static fixed reactive power output of the centralized camera.
Further, the determining the maximum replacement group number of the alternating current filter of the direct current system according to the static reactive power regulation upper limit of the centralized camera and the single group capacity of the alternating current filter of the direct current system comprises the following steps:
wherein Q is max Upper limit of static reactive power regulation for centralized camera, Q f For the single group capacity of the alternating current filter of the direct current system, n represents Q max And Q f Dividing the resulting integer, Q r Is Q max And Q f Dividing the remainder;
when Q is r When the number of the alternating current filter replacement groups of the direct current system is=0, the maximum number of the alternating current filter replacement groups of the direct current system is n groups;
when Q is r When not equal to 0, the number of alternating current filter replacement groups of the direct current system is n+1 at maximum.
Further, the problem of transient overvoltage of the new energy is solved, including:
in the transient process of the new energy, the new energy unit does not exceed the highest voltage withstand value.
Further, the output centralized type camera static fixed reactive power output comprises:
if the problem of transient overvoltage of the new energy is solved when n=m, then,
when m is less than or equal to n, the static constant reactive power output of the centralized camera is m multiplied by Q f ；
When m is more than n, the static constant reactive power output of the centralized camera is Q max ；
Wherein Q is r When=0, m e (1, 2 … n); q (Q) r When not equal to 0, m is E (1, 2 … n+1);
if the reactive power output replacement of the centralized type phase-change machine reaches the maximum group number of the alternating current filter replacement of the direct current system, the problem of transient overvoltage of new energy still exists, and the static fixed reactive power output of the centralized type phase-change machine is Q max 。
Further, the calculating the transient overvoltage sensitivity of the new energy source for suppressing the reactive power control of the distributed phase-change modulator comprises the following steps:
λ i ＝ΔV id /ΔQ id
wherein lambda is i Suppressing new energy transient voltage rise sensitivity, deltaq, for static reactive power output of point i camera id Static reactive power increase, deltaV, for point i camera id For the transient voltage rise change of new energy at the point i after the continuous commutation failure fault of direct current, i=1, 2 … M, M is the number of distributed phase-regulating machines;
ΔV id the calculation is as follows:
wherein,representing the transient voltage rise of new energy after the failure of direct current commutation failure occurs in the power grid operation mode before the reactive power of the distributed phase regulator is increased, +.>Representing the reactive power increase DeltaQ of a distributed phase-change camera implemented in the original mode at a location i id And the new energy transient voltage rises after the direct current commutation failure fault in the power grid operation mode.
Further, the suppressing the transient overvoltage sensitivity of the new energy based on the reactive power control of the distributed phase-change modulator performs the reactive power control of the distributed phase-change modulator, including:
sequencing the static reactive power output inhibition new energy transient voltage rise sensitivity of the distributed type phase-change machine from large to small, and determining the control sequence of each distributed type phase-change machine according to the sequencing;
checking the step-by-step delta Q one by one according to the control sequence of the distributed camera jd The transient voltage of the new energy is increased after the direct current commutation fails under the condition of static reactive power output until the transient overvoltage of the new energy is eliminated or the maximum static reactive power output of all the distributed phase regulators is reached;
and outputting the static reactive output value and the control result information of each distributed type phase-regulating machine participating in reactive control.
The invention also provides a reactive coordination control device of the centralized and distributed camera, comprising:
the first strategy module is used for judging the transient overvoltage of the new energy based on the electromechanical simulation data of the power grid of the T time section in the future and determining the reactive power control strategy of the centralized type phase regulator;
the first calculation module is used for calculating the sensitivity of the distributed phase-change regulator for suppressing the transient overvoltage of the new energy source under reactive power control;
the method comprises the steps of,
and the second strategy module is used for inhibiting the transient overvoltage sensitivity of the new energy based on the reactive power control of the distributed type camera to perform the reactive power control of the distributed type camera.
Further, the first policy module is specifically configured to,
based on the electromechanical simulation data of the power grid of the T time section in the future, simulating and checking whether the transient overvoltage of the near-area new energy occurs after the continuous commutation failure of the direct current of the new energy collecting and transmitting end;
if so, determining the maximum replacement group number of the alternating current filter of the direct current system according to the static reactive power regulation upper limit of the centralized camera and the single-group capacity of the alternating current filter of the direct current system;
sequentially checking the reactive power output of the centralized phase-regulating machine to replace N groups of alternating current filters of the direct current system, and after a direct current continuous phase-change failure fault occurs, obtaining a new energy transient voltage level until the problem of the new energy transient overvoltage is solved or the maximum number of the alternating current filters of the direct current system is reached; wherein n=1, 2 …;
and outputting static fixed reactive power output of the centralized camera.
Further, the first policy module is specifically configured to,
the calculation is performed as follows:
wherein Q is max To concentrateStatic reactive power regulation upper limit of phase regulator, Q f For the single group capacity of the alternating current filter of the direct current system, n represents Q max And Q f Dividing the resulting integer, Q r Is Q max And Q f Dividing the remainder;
when Q is r When the number of the alternating current filter replacement groups of the direct current system is=0, the maximum number of the alternating current filter replacement groups of the direct current system is n groups;
when Q is r When not equal to 0, the number of alternating current filter replacement groups of the direct current system is n+1 at maximum.
Further, the first policy module is specifically configured to,
if the problem of transient overvoltage of the new energy is solved when n=m, then,
when m is less than or equal to n, the static constant reactive power output of the centralized camera is m multiplied by Q f ；
When m is more than n, the static constant reactive power output of the centralized camera is Q max ；
Wherein Q is r When=0, m e (1, 2 … n); q (Q) r When not equal to 0, m is E (1, 2 … n+1);
if the reactive power output replacement of the centralized type phase-change machine reaches the maximum group number of the alternating current filter replacement of the direct current system, the problem of transient overvoltage of new energy still exists, and the static fixed reactive power output of the centralized type phase-change machine is Q max 。
Further, the second policy module is specifically configured to,
sequencing the static reactive power output inhibition new energy transient voltage rise sensitivity of the distributed type phase-change machine from large to small, and determining the control sequence of each distributed type phase-change machine according to the sequencing;
checking the step-by-step delta Q one by one according to the control sequence of the distributed camera jd The transient voltage of the new energy is increased after the direct current commutation fails under the condition of static reactive power output until the transient overvoltage of the new energy is eliminated or the maximum static reactive power output of all the distributed phase regulators is reached;
and outputting the static reactive output value and the control result information of each distributed type phase-regulating machine participating in reactive control.
The beneficial effects of the invention are as follows:
the invention suppresses the transient voltage rise of new energy after the direct current commutation failure fault by coordinating the reactive power of the centralized large-sized camera and the distributed small-sized camera, and promotes the capability of the new energy to be absorbed by direct current in a long distance.
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Fig. 1 is a flow chart of the method of the present invention.
Detailed Description
The invention is further described below. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Referring to fig. 1, the invention provides a reactive coordination control method for a centralized and distributed type camera for restraining transient overvoltage of new energy, which comprises the following steps:
acquiring information such as power grid electromechanical simulation data of a future T time section, capacity and reactive power regulation capacity of a centralized and distributed type regulator, the number and capacity of a direct current filter bank, transient high voltage resistance of wind and light new energy and the like on line;
based on the electromechanical simulation data of the power grid of the T time section in the future, judging the transient overvoltage of the new energy, and determining the reactive power control strategy of the centralized phase regulator;
if the reactive power control strategy of the centralized type camera does not meet the requirement of suppressing the transient overvoltage of the new energy, calculating the sensitivity of suppressing the transient overvoltage of the new energy by the reactive power control of the distributed type camera;
and suppressing the transient overvoltage sensitivity of the new energy based on the reactive power control of the distributed type camera to perform reactive power control of the distributed type camera.
Specifically, based on the electromechanical simulation data of the power grid of the future T time section, the transient overvoltage judgment of the new energy is carried out, and the reactive power control strategy of the centralized type phase-change modulator is determined, which comprises the following steps:
based on power grid electromechanical simulation data of a T time section in the future, simulating and checking whether new energy in a near zone is transient overvoltage after continuous commutation failure of direct current at a new energy collecting and transmitting end, if so, analyzing the effect of suppressing the transient overvoltage of the new energy by a reactive replacement direct current filter of a centralized type phase-adjusting machine, and determining a reactive control strategy of the centralized type phase-adjusting machine; if not, returning. The method comprises the following steps:
2-a) the centralized camera is operated in a static state in a fixed reactive control mode, and the static reactive regulation range is set as [ -Q min ,Q max ]The single group capacity of the alternating current filter of the direct current system is Q f ，
Determining the maximum number of the direct current filter replacement groups according to the following steps:
wherein n represents Q max And Q f Dividing the resulting integer, Q r Is Q max And Q f Dividing the remainder;
when Q is r When=0, the number of alternating current filter replacement groups of the direct current system is n at most;
when Q is r When the number of the alternating current filter replacement groups of the direct current system is not equal to 0, the maximum number of the alternating current filter replacement groups is n+1, namely when the final static reactive capacity is not equal to the number of the filter replacement groups, the whole filter replacement groups are analyzed in checking, and the reactive power required by the direct current is supplied by the alternating current system.
2-b) respectively checking the transient voltage level of new energy after the reactive power output of the centralized phase regulator replaces N groups of direct current filters and the direct current continuous phase change failure fault occurs by using power simulation software;
wherein Q is r When the voltage is=0, sequentially checking the transient voltage level of the new energy after the failure of direct-current continuous commutation when n=1 and 2 … N occurs; q (Q) r When the voltage is not equal to 0, sequentially checking the transient voltage level of the new energy after the failure of direct current continuous commutation when N=1 and 2 … n+1;
if n=m, the problem of transient overvoltage of the new energy is solved, and the static fixed reactive power output of the centralized phase-adjusting machine is as follows:
when m is less than or equal to n, the static constant reactive power output of the centralized camera is m multiplied by Q f ；
When m is more than n, the static constant reactive power output of the centralized camera is Q max ；
Wherein Q is r When the value of the sum is =0,m∈(1,2…n)；Q r when not equal to 0, m is E (1, 2 … n+1).
Judging that the problem of transient overvoltage of the new energy is solved comprises the following steps:
the new energy unit in the near zone generally has the highest withstand voltage value, for example, the withstand voltage value is not more than 1.2p.u in the transient process, and the network is disconnected when the withstand voltage value exceeds the threshold value, namely, the value to be checked is the value to see whether the withstand voltage value exceeds the threshold value after the fault.
If the problem of transient overvoltage of new energy still exists, the static constant reactive power output of the centralized type phase-adjusting machine is Q max 。
Specifically, calculating the sensitivity of the distributed phase-change regulator to suppress the transient overvoltage of the new energy source by reactive power control, comprising:
3-a) designing different-place distributed phase-change machine static reactive power output increase delta Q id I=1, 2 … M; wherein M is the number of distributed cameras;
calculating the transient voltage rise change delta V of new energy after continuous commutation failure fault of direct current id ：
Wherein,representing the transient voltage rise of new energy after the failure of direct current commutation failure occurs in the power grid operation mode before the reactive power of the distributed phase regulator is increased, +.>Representing the reactive power increase DeltaQ of an i-point distributed phase-change camera implemented in the original manner id And the new energy transient voltage rises after the direct current commutation failure fault in the power grid operation mode.
3-b) calculating static reactive power output inhibition new energy transient voltage rise sensitivity lambda of distributed type camera i ：
λ i ＝ΔV id /ΔQ id
Specifically, based on the reactive power control of the distributed camera, the transient overvoltage sensitivity of the new energy is restrained for the reactive power control of the distributed camera, which comprises the following steps:
4-a) sensitivity lambda i Sequencing from big to small, and determining the control sequence of each distributed camera according to sequencing;
4-b) checking the step-by-step delta Q one by one according to the control sequence of the distributed camera jd And increasing the transient voltage of the new energy after the direct current commutation fails under the condition of static reactive power output until the transient overvoltage of the new energy is eliminated or the maximum static reactive power output of all the distributed phase regulators is reached.
And finally, outputting the static reactive output values of the centralized cameras and the distributed cameras and the control result information.
The invention also provides a reactive coordination control device of the centralized and distributed camera, comprising:
the first strategy module is used for judging the transient overvoltage of the new energy based on the electromechanical simulation data of the power grid of the T time section in the future and determining the reactive power control strategy of the centralized type phase regulator;
the first calculation module is used for calculating the sensitivity of the distributed phase-change regulator for suppressing the transient overvoltage of the new energy source under reactive power control;
the method comprises the steps of,
and the second strategy module is used for inhibiting the transient overvoltage sensitivity of the new energy based on the reactive power control of the distributed type camera to perform the reactive power control of the distributed type camera.
The first policy module is specifically configured to,
based on the electromechanical simulation data of the power grid of the T time section in the future, simulating and checking whether the transient overvoltage of the near-area new energy occurs after the continuous commutation failure of the direct current of the new energy collecting and transmitting end;
if so, determining the maximum replacement group number of the alternating current filter of the direct current system according to the static reactive power regulation upper limit of the centralized camera and the single-group capacity of the alternating current filter of the direct current system;
sequentially checking the reactive power output of the centralized phase-regulating machine to replace N groups of alternating current filters of the direct current system, and after a direct current continuous phase-change failure fault occurs, obtaining a new energy transient voltage level until the problem of the new energy transient overvoltage is solved or the maximum number of the alternating current filters of the direct current system is reached; wherein n=1, 2 …;
and outputting static fixed reactive power output of the centralized camera.
The first policy module is specifically configured to,
the calculation is performed as follows:
wherein Q is max Upper limit of static reactive power regulation for centralized camera, Q f For the single group capacity of the alternating current filter of the direct current system, n represents Q max And Q f Dividing the resulting integer, Q r Is Q max And Q f Dividing the remainder;
when Q is r When the number of the alternating current filter replacement groups of the direct current system is=0, the maximum number of the alternating current filter replacement groups of the direct current system is n groups;
when Q is r When not equal to 0, the number of alternating current filter replacement groups of the direct current system is n+1 at maximum.
The first policy module is specifically configured to,
if the problem of transient overvoltage of the new energy is solved when n=m, then,
when m is less than or equal to n, the static constant reactive power output of the centralized camera is m multiplied by Q f ；
When m is more than n, the static constant reactive power output of the centralized camera is Q max ；
Wherein Q is r When=0, m e (1, 2 … n); q (Q) r When not equal to 0, m is E (1, 2 … n+1);
if the reactive power output replacement of the centralized type phase-change machine reaches the maximum group number of the alternating current filter replacement of the direct current system, the problem of transient overvoltage of new energy still exists, and the static fixed reactive power output of the centralized type phase-change machine is Q max 。
The second policy module is specifically configured to,
sequencing the static reactive power output inhibition new energy transient voltage rise sensitivity of the distributed type phase-change machine from large to small, and determining the control sequence of each distributed type phase-change machine according to the sequencing;
checking the step-by-step delta Q one by one according to the control sequence of the distributed camera jd The transient voltage of the new energy is increased after the direct current commutation fails under the condition of static reactive power output until the transient overvoltage of the new energy is eliminated or the maximum static reactive power output of all the distributed phase regulators is reached;
and outputting the static reactive output value and the control result information of each distributed type phase-regulating machine participating in reactive control.
It should be noted that the embodiment of the apparatus corresponds to the embodiment of the method, and the implementation manner of the embodiment of the method is applicable to the embodiment of the apparatus and can achieve the same or similar technical effects, so that the description thereof is omitted herein.
It will be appreciated by those skilled in the art that 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 is 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (4)
1. A reactive coordination control method for a centralized and distributed camera is characterized by comprising the following steps:
based on the electromechanical simulation data of the power grid of the T time section in the future, the transient overvoltage judgment of the new energy is carried out, and the reactive power control strategy of the centralized type phase regulator is determined, which comprises the following steps:
based on the electromechanical simulation data of the power grid of the T time section in the future, simulating and checking whether the transient overvoltage of the near-area new energy occurs after the continuous commutation failure of the direct current of the new energy collecting and transmitting end;
if yes, determining the maximum replacement group number of the alternating current filter of the direct current system according to the static reactive power regulation upper limit of the centralized camera and the single-group capacity of the alternating current filter of the direct current system, wherein the method comprises the following steps: calculation ofWherein Q is max Upper limit of static reactive power regulation for centralized camera, Q f For the single group capacity of the alternating current filter of the direct current system, n represents Q max And Q f Dividing the resulting integer, Q r Is Q max And Q f Dividing the remainder; when Q is r When the number of the alternating current filter replacement groups of the direct current system is=0, the maximum number of the alternating current filter replacement groups of the direct current system is n groups; when Q is r When the number of the alternating current filter replacement groups of the direct current system is not equal to 0, the maximum number of the alternating current filter replacement groups of the direct current system is n+1 groups;
sequentially checking the reactive power output of the centralized phase-regulating machine to replace N groups of alternating current filters of the direct current system, and after a direct current continuous phase-change failure fault occurs, obtaining a new energy transient voltage level until the problem of the new energy transient overvoltage is solved or the maximum number of the alternating current filters of the direct current system is reached; wherein n=1, 2 …; the problem of transient overvoltage of the new energy is solved, which means that: in the transient process of the new energy, the new energy unit does not exceed the highest withstand voltage value;
the static fixed reactive power output of the centralized camera is output as follows:
if the problem of transient overvoltage of the new energy is solved when n=m, then,
when m is less than or equal to n, the static constant reactive power output of the centralized camera is m multiplied by Q f ；
When m is more than n, the static constant reactive power output of the centralized camera is Q max ；
Wherein Q is r When=0, m e (1, 2 … n); q (Q) r When not equal to 0, m is E (1, 2 … n+1);
if the reactive power output replacement of the centralized type phase-change machine reaches the maximum group number of the alternating current filter replacement of the direct current system, the problem of transient overvoltage of new energy still exists, and the static fixed reactive power output of the centralized type phase-change machine is Q max ；
If the reactive power control strategy of the centralized type camera does not meet the requirement of suppressing the transient overvoltage of the new energy, the sensitivity of the reactive power control of the distributed type camera to suppress the transient overvoltage of the new energy is calculated as follows:
λ i ＝ΔV id /ΔQ id ，
wherein lambda is i Suppressing new energy transient voltage rise sensitivity, deltaq, for static reactive power output of point i camera id Static reactive power increase, deltaV, for point i camera id For the transient voltage rise change of new energy at the point i after the continuous commutation failure fault of direct current, i=1, 2 … M, M is the number of distributed phase-regulating machines;
ΔV id the calculation is as follows:
wherein,representing the transient voltage rise of new energy after the failure of direct current commutation failure occurs in the power grid operation mode before the reactive power of the distributed phase regulator is increased, +.>Representing the reactive power increase DeltaQ of a distributed phase-change camera implemented in the original mode at a location i id The new energy transient voltage rises after the failure of direct current commutation under the operation mode of the power grid;
and suppressing the transient overvoltage sensitivity of the new energy based on the reactive power control of the distributed type camera to perform reactive power control of the distributed type camera.
2. The method for coordinated reactive power control of a centralized and distributed type camera according to claim 1, wherein the suppressing the transient overvoltage sensitivity of the new energy based on the reactive power control of the distributed type camera comprises:
sequencing the static reactive power output inhibition new energy transient voltage rise sensitivity of the distributed type phase-change machine from large to small, and determining the control sequence of each distributed type phase-change machine according to the sequencing;
checking the step-by-step delta Q one by one according to the control sequence of the distributed camera jd New energy transient voltage after direct current commutation failure under static reactive power output increasing conditionRaising until the transient overvoltage of the new energy is eliminated or the maximum static reactive power output of all the distributed phase adjusters is reached;
and outputting the static reactive output value and the control result information of each distributed type phase-regulating machine participating in reactive control.
3. A reactive coordination control device for a centralized and distributed camera, comprising:
the first strategy module is used for judging the transient overvoltage of the new energy based on the electromechanical simulation data of the power grid of the T time section in the future, and determining the reactive power control strategy of the centralized type phase regulator, and the specific implementation mode is as follows: based on the electromechanical simulation data of the power grid of the T time section in the future, simulating and checking whether the transient overvoltage of the near-area new energy occurs after the continuous commutation failure of the direct current of the new energy collecting and transmitting end;
if so, determining the maximum replacement group number of the alternating current filter of the direct current system according to the static reactive power regulation upper limit of the centralized camera and the single-group capacity of the alternating current filter of the direct current system, wherein the calculation mode is as follows: and (3) calculating:wherein Q is max Upper limit of static reactive power regulation for centralized camera, Q f For the single group capacity of the alternating current filter of the direct current system, n represents Q max And Q f Dividing the resulting integer, Q r Is Q max And Q f Dividing the remainder; when Q is r When the number of the alternating current filter replacement groups of the direct current system is=0, the maximum number of the alternating current filter replacement groups of the direct current system is n groups; when Q is r When the number of the alternating current filter replacement groups of the direct current system is not equal to 0, the maximum number of the alternating current filter replacement groups of the direct current system is n+1 groups;
sequentially checking the reactive power output of the centralized phase-regulating machine to replace N groups of alternating current filters of the direct current system, and after a direct current continuous phase-change failure fault occurs, obtaining a new energy transient voltage level until the problem of the new energy transient overvoltage is solved or the maximum number of the alternating current filters of the direct current system is reached; wherein n=1, 2 …;
the static fixed reactive power output of the centralized camera is output as follows:
if the problem of transient overvoltage of the new energy is solved when n=m, then,
when m is less than or equal to n, the static constant reactive power output of the centralized camera is m multiplied by Q f ；
When m is more than n, the static constant reactive power output of the centralized camera is Q max ；
Wherein Q is r When=0, m e (1, 2 … n); q (Q) r When not equal to 0, m is E (1, 2 … n+1);
if the reactive power output replacement of the centralized type phase-change machine reaches the maximum group number of the alternating current filter replacement of the direct current system, the problem of transient overvoltage of new energy still exists, and the static fixed reactive power output of the centralized type phase-change machine is Q max ；
The first calculation module is used for calculating the sensitivity of the reactive power control of the distributed type phase-change regulator to inhibit the transient overvoltage of the new energy if the reactive power control strategy of the centralized type phase-change regulator does not meet the requirement of inhibiting the transient overvoltage of the new energy, and calculating as follows:
λ i ＝ΔV id /ΔQ id ，
wherein lambda is i Suppressing new energy transient voltage rise sensitivity, deltaq, for static reactive power output of point i camera id Static reactive power increase, deltaV, for point i camera id For the transient voltage rise change of new energy at the point i after the continuous commutation failure fault of direct current, i=1, 2 … M, M is the number of distributed phase-regulating machines;
ΔV id the calculation is as follows:
wherein,representing the transient voltage rise of new energy after the failure of direct current commutation failure occurs in the power grid operation mode before the reactive power of the distributed phase regulator is increased, +.>Representative ofImplementing a distributed camera reactive power increase Δq at site i in an original manner id The new energy transient voltage rises after the failure of direct current commutation under the operation mode of the power grid;
the method comprises the steps of,
and the second strategy module is used for inhibiting the transient overvoltage sensitivity of the new energy based on the reactive power control of the distributed type camera to perform the reactive power control of the distributed type camera.
4. The reactive coordination control device of a centralized and distributed type camera as claimed in claim 3, wherein the second strategy module is specifically configured to,
sequencing the static reactive power output inhibition new energy transient voltage rise sensitivity of the distributed type phase-change machine from large to small, and determining the control sequence of each distributed type phase-change machine according to the sequencing;
checking the step-by-step delta Q one by one according to the control sequence of the distributed camera jd The transient voltage of the new energy is increased after the direct current commutation fails under the condition of static reactive power output until the transient overvoltage of the new energy is eliminated or the maximum static reactive power output of all the distributed phase regulators is reached; and outputting the static reactive output value and the control result information of each distributed type phase-regulating machine participating in reactive control.
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