CN114336724A - Reactive power coordination control method and device for centralized and distributed phase modulators - Google Patents
Reactive power coordination control method and device for centralized and distributed phase modulators Download PDFInfo
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Abstract
The invention discloses a reactive power coordination control method and device for a centralized phase modulator and a distributed phase modulator, and belongs to the technical field of power systems and automation thereof. The method comprises the following steps: analyzing the effect of the reactive power replacement direct-current filter of the centralized phase modulator on suppressing the transient overvoltage of the new energy based on the electromechanical simulation data of the power grid of the future T time section, and determining a reactive power control strategy of the centralized phase modulator; if the reactive power control strategy of the centralized phase modulator does not meet the requirement for suppressing the transient overvoltage of the new energy, the reactive power output of each distributed phase modulator is determined based on the sensitivity of the distributed phase modulators for reactive power control for suppressing the transient overvoltage of the new energy at different places, so that the transient overvoltage after the fault of a system for collecting and sending the new energy at a sending end and sending the collected direct current to the sending end is coordinately suppressed by the different types of phase modulators, the coordination capability of the reactive power resources of a power grid is improved, and the remote consumption capability of the new energy through the direct current is promoted.
Description
Technical Field
The invention belongs to the technical field of electric power systems and automation thereof, and more particularly relates to a reactive power coordination control method and device for centralized and distributed phase modulators.
Background
At present, wind and light new energy power generation resources are developed on a large scale and are absorbed by an extra-high voltage direct current remote transmission load center, which becomes an important means for converting electric energy in China, but due to the fact that the voltage resistance of new energy is weak, transient overvoltage of new energy in a near area is easily caused after continuous commutation failure and other faults occur in direct current, the risk of large-scale off-grid linkage reaction of new energy exists, and the new energy grid-connected scale and the direct current transmission capacity are greatly limited. Compared with dynamic reactive power equipment such as SVC (static var compensator), the phase modulator depends on armature flux linkage conservation and does not depend on measurement and control links, can effectively follow system voltage change, does not have the problem of voltage inverse modulation, and is taken as an important means for solving transient overvoltage of new energy after faults such as failure of direct current commutation at a sending end. However, with the increase of the scale of a new energy base and the improvement of the direct current transmission capacity, the effect of eliminating the transient overvoltage of the new energy by means of the concentrated installation of a new generation large phase modulator in the converter station is not obvious, the transient overvoltage suppression capacity of the new energy can be effectively improved by additionally installing a distributed small phase modulator at a new energy collection point, the phase modulator is recognized gradually, and the phase modulator is planned in a Qinghai power grid and is an important means for improving the Qingyu ultrahigh voltage direct current transmission capacity and the new energy in the south of the proximal region.
At present, a sending end direct current converter station such as Qishao in China is provided with a new generation phase modulator, the reactive power output of the phase modulator under a static working condition is basically considered according to 0, and although a certain adjusting capacity can be exerted in a transient state period, the more the phase modulator initially emits reactive power and the stronger the transient state phase-advancing capacity is, the exertion of the capacity is limited, the improvement of the direct current transmission capacity is directly influenced, and the resource waste is caused. On the other hand, theories and practices show that under the same power level of direct current, transient voltage rise of the direct current is smaller in an under-compensation mode than in an over-compensation mode, and therefore the transient voltage rise after a fault is reduced by reactive replacement of a phase modulator and a direct current filter.
Disclosure of Invention
The invention aims to provide a reactive power coordination control method for a centralized phase modulator and a distributed phase modulator, which inhibits the transient state voltage rise of new energy after a direct current commutation failure fault by coordinating the reactive power output of the centralized large phase modulator and the distributed small phase modulator, and promotes the long-distance direct current consumption capability of the new energy.
The invention is realized by adopting the following technical scheme,
the invention provides a reactive power coordination control method for a centralized phase modulator and a distributed phase modulator, which comprises the following steps:
based on the electromechanical simulation data of the power grid of the future T time section, the transient overvoltage of the new energy is judged, and a reactive power control strategy of the centralized phase modulator is determined;
if the reactive power control strategy of the centralized phase modulator does not meet the requirement of suppressing the transient overvoltage of the new energy, calculating the sensitivity of the distributed phase modulator for reactive power control suppression of the transient overvoltage of the new energy;
and carrying out reactive control on the distributed phase modulator based on the sensitivity of reactive control on the new energy transient overvoltage of the distributed phase modulator.
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 a centralized phase modulator reactive power control strategy is determined, and the method comprises the following steps:
based on the electromechanical simulation data of the power grid of the future T time section, performing simulation check on whether the new energy in the near area is transient overvoltage or not after continuous commutation failure of direct current of a new energy collection sending end;
if so, determining the maximum group number of the direct current system alternating current filter replacement according to the static reactive power regulation upper limit of the centralized phase modulator and the single group capacity of the direct current system alternating current filter;
sequentially checking the reactive power output of the centralized phase modulator to replace N groups of direct current system alternating current filters, and after a direct current continuous commutation failure fault occurs, performing new energy transient voltage level until the problem of new energy transient overvoltage is solved or the maximum group number of the direct current system alternating current filters is replaced; wherein N is 1,2 …;
and outputting static fixed and reactive output of the centralized phase modulator.
Further, the determining the maximum number of the replaced groups of the ac filter of the dc system according to the single group capacity of the ac filter of the dc system and the upper limit of the static var adjustment of the centralized phase modulator includes:
wherein Q ismaxFor static reactive regulation upper limit, Q, of a centralized phase modulatorfFor a single set of capacity of AC filters in DC systems, n represents QmaxAnd QfInteger obtained by division, QrIs QmaxAnd QfA remainder obtained by the division;
when Q isrWhen the number of the replacement groups of the alternating current filter of the direct current system is 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n;
when Q isrWhen not equal to 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n +1 groups.
Further, the problem of transient overvoltage of the new energy is solved, and the method comprises the following steps:
in the transient process of the new energy, the new energy unit does not exceed the highest withstand voltage value.
Further, the output centralized phase modulator static constant-reactive power output includes:
if the problem of transient overvoltage of new energy is solved when N is m, then,
when m is less than or equal to n, the static constant and reactive power output of the centralized phase modulator is mxQf；
When m is more than n, the static constant and reactive power output of the centralized phase modulator is Qmax；
Wherein Q isrWhen 0, m ∈ (1,2 … n); qrWhen not equal to 0, m is equal to (1,2 … n + 1);
if concentratedWhen the reactive power output replacement of the phase modulator reaches the maximum group number of the replacement of the alternating current filter of the direct current system, the problem of transient overvoltage of new energy still exists, and the static constant reactive power output of the centralized phase modulator is Qmax。
Further, the calculating the sensitivity of the reactive power control of the distributed phase modulator for suppressing the transient overvoltage of the new energy includes:
λi＝ΔVid/ΔQid
wherein λ isiSuppression of new energy transient voltage rise sensitivity, Δ Q, for phase modulator static reactive power output of site iidFor increased static reactive power output, Δ V, of the phase modifier at site iidThe transient state voltage rise change of the new energy at the place i after the continuous commutation failure occurs in the direct current is 1,2 … M, and M is the number of the distributed phase modulators;
ΔVidthe calculation is as follows:
wherein the content of the first and second substances,
representing the transient state voltage rise of new energy after the fault of direct current commutation failure occurs in the operation mode of the power grid before the reactive power output of the distributed phase modulator is increased,
representing the increase in reactive power output Δ Q of a distributed phase modulator implemented in situidAnd transient voltage rise of the new energy after the direct current commutation failure fault in the later power grid operation mode.
Further, the reactive power control of the distributed phase modulator based on the reactive power control of the distributed phase modulator for suppressing the transient overvoltage sensitivity of the new energy includes:
sequencing static reactive power output suppression new energy transient voltage rising sensitivity of the distributed phase modulators from large to small, and determining a control sequence of each distributed phase modulator according to the sequencing;
checking the step length delta Q one by one according to the control sequence of the distributed phase modulatorjdIncreasing the transient voltage rise of the new energy after the direct current commutation failure under the condition of increasing the static reactive output until the transient overvoltage of the new energy is eliminated or the maximum static reactive output of all distributed phase modulators is reached;
and outputting static reactive power output values and control result information of all the distributed phase modulators participating in reactive power control.
The invention also provides a reactive power coordination control device of the centralized and distributed phase modulators, which comprises:
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 future T time section and determining a reactive power control strategy of the centralized phase modulator;
the first calculation module is used for calculating the sensitivity of the distributed phase modulator for reactive control suppression of the transient overvoltage of the new energy;
and the number of the first and second groups,
and the second strategy module is used for suppressing the transient overvoltage sensitivity of the new energy based on the reactive control of the distributed phase modulator to perform the reactive control of the distributed phase modulator.
Further, the first policy module is specifically configured to,
based on the electromechanical simulation data of the power grid of the future T time section, performing simulation check on whether the new energy in the near area is transient overvoltage or not after continuous commutation failure of direct current of a new energy collection sending end;
if so, determining the maximum group number of the direct current system alternating current filter replacement according to the static reactive power regulation upper limit of the centralized phase modulator and the single group capacity of the direct current system alternating current filter;
sequentially checking the reactive power output of the centralized phase modulator to replace N groups of direct current system alternating current filters, and after a direct current continuous commutation failure fault occurs, performing new energy transient voltage level until the problem of new energy transient overvoltage is solved or the maximum group number of the direct current system alternating current filters is replaced; wherein N is 1,2 …;
and outputting static fixed and reactive output of the centralized phase modulator.
Further, the first policy module is specifically configured to,
the calculation is performed as follows:
wherein Q ismaxFor static reactive regulation upper limit, Q, of a centralized phase modulatorfFor a single set of capacity of AC filters in DC systems, n represents QmaxAnd QfInteger obtained by division, QrIs QmaxAnd QfA remainder obtained by the division;
when Q isrWhen the number of the replacement groups of the alternating current filter of the direct current system is 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n;
when Q isrWhen not equal to 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n +1 groups.
Further, the first policy module is specifically configured to,
if the problem of transient overvoltage of new energy is solved when N is m, then,
when m is less than or equal to n, the static constant and reactive power output of the centralized phase modulator is mxQf；
When m is more than n, the static constant and reactive power output of the centralized phase modulator is Qmax；
Wherein Q isrWhen 0, m ∈ (1,2 … n); qrWhen not equal to 0, m is equal to (1,2 … n + 1);
if the problem of transient overvoltage of new energy still exists when the reactive power output replacement of the centralized phase modulator reaches the maximum group number of the replacement of the alternating current filter of the direct current system, the static constant reactive power output of the centralized phase modulator is Qmax。
Further, the second policy module is specifically configured to,
sequencing static reactive power output suppression new energy transient voltage rising sensitivity of the distributed phase modulators from large to small, and determining a control sequence of each distributed phase modulator according to the sequencing;
checking the step length delta Q one by one according to the control sequence of the distributed phase modulatorjdTransient voltage rise of new energy after direct current commutation failure under the condition of increasing static reactive power output until new energy is eliminatedEnergy transient overvoltage or the maximum static reactive output of all distributed phase modulators is reached;
and outputting static reactive power output values and control result information of all the distributed phase modulators participating in reactive power control.
The invention has the following beneficial effects:
according to the invention, through coordinating the reactive power output of the centralized large phase modulator and the distributed small phase modulators, the transient voltage rise of the new energy after the failure of direct-current commutation is inhibited, and the capability of the new energy to be consumed remotely through direct current is promoted.
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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 illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Referring to fig. 1, the invention provides a reactive power coordination control method for a centralized phase modulator and a distributed phase modulator for suppressing transient overvoltage of new energy, comprising the following steps:
acquiring information such as power grid electromechanical simulation data of a future T time section, capacity of a centralized and distributed phase modulator and reactive power regulation capacity thereof, the number of direct current filter sets and capacity thereof, transient high voltage resistance of wind-solar new energy and the like on line;
based on the electromechanical simulation data of the power grid of the future T time section, the transient overvoltage of the new energy is judged, and a reactive power control strategy of the centralized phase modulator is determined;
if the reactive power control strategy of the centralized phase modulator does not meet the requirement of suppressing the transient overvoltage of the new energy, calculating the sensitivity of the distributed phase modulator for reactive power control suppression of the transient overvoltage of the new energy;
and carrying out reactive control on the distributed phase modulator based on the sensitivity of reactive control on the new energy transient overvoltage of the distributed phase modulator.
Specifically, based on the electromechanical simulation data of the power grid of the future T time section, the new energy transient overvoltage is judged, and the reactive power control strategy of the centralized phase modulator is determined, and the method comprises the following steps:
based on the electromechanical simulation data of a power grid of a future T time section, performing simulation check on whether transient overvoltage occurs to near-region new energy after continuous commutation failure of direct current of a new energy collecting and sending end, if so, analyzing the effect of a reactive power replacement direct current filter of a centralized phase modulator on suppressing the transient overvoltage of the new energy, and determining a reactive power control strategy of the centralized phase modulator; if not, returning. The method comprises the following specific steps:
2-a) the static state of the centralized phase modulator is operated in a constant reactive power control mode, and the static reactive power regulation range of the centralized phase modulator is set to be [ -Q ]min,Qmax]The single group capacity of the AC filter of the DC system is Qf，
Determining the maximum number of DC filter permutations according to the following formula:
wherein n represents QmaxAnd QfInteger obtained by division, QrIs QmaxAnd QfA remainder obtained by the division;
when Q isrWhen 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 is n;
when Q isrWhen 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, namely when the static reactive capacity does not meet the requirement of replacing the whole group of filters according to the same quantity, the whole group of filters is analyzed during checking, and reactive power required by direct current is supplemented and provided by the alternating current system.
2-b) respectively checking the reactive power output replacement N groups of direct current filters of the centralized phase modulator by using electric power simulation software, and after the direct current continuous commutation failure fault occurs, performing new energy transient voltage level;
wherein Q isrWhen the voltage value is equal to 0, sequentially checking the transient voltage level of the new energy after the direct current continuous commutation failure occurs when N is equal to 1 and 2 … N; qrWhen the voltage is not equal to 0, sequentially checking the transient voltage level of the new energy after the direct-current continuous commutation failure fault occurs when N is equal to 1 and 2 … N + 1;
if N is equal to m, the problem of transient overvoltage of the new energy is solved, and the static fixed reactive power output of the centralized phase modulator is as follows:
when m is less than or equal to n, the static constant and reactive power output of the centralized phase modulator is mxQf；
When m is more than n, the static constant and reactive power output of the centralized phase modulator is Qmax；
Wherein Q isrWhen 0, m ∈ (1,2 … n); qrWhen not equal to 0, m.epsilon. (1,2 … n + 1).
The problem of judging the transient overvoltage of the new energy is solved, and the method comprises the following steps:
generally, the new energy source unit in the near zone has the highest withstand voltage value, for example, the withstand voltage value does not exceed 1.2p.u in the transient process, the network is disconnected when the withstand voltage value exceeds the maximum withstand voltage value, and the value is the value to be checked to see whether the withstand voltage value exceeds the maximum withstand voltage value after the fault occurs.
If the transient overvoltage problem of the new energy still exists, the static constant reactive power output of the centralized phase modulator is Qmax。
Specifically, calculate distributed phase modulation machine reactive control and restrain new forms of energy transient overvoltage sensitivity, include:
3-a) designing static reactive power output increase delta Q of distributed phase modulators in different placesidI is 1,2 … M; wherein M is the number of the distributed phase modulators;
calculating the transient voltage rise change delta V of the new energy after the continuous commutation failure fault of the direct currentid：
Wherein the content of the first and second substances,
representing the transient state voltage rise of new energy after the fault of direct current commutation failure occurs in the operation mode of the power grid before the reactive power output of the distributed phase modulator is increased,
representing the increase in reactive power output Δ Q of an i-site distributed phase modulator implemented in the original manneridNew energy transient state after direct current commutation failure fault in later power grid operation modeAnd (5) increasing the pressure.
3-b) calculating the static reactive power output suppression new energy transient state voltage rise sensitivity lambda of the distributed phase modulatori：
λi＝ΔVid/ΔQid
Concretely, restrain new forms of energy transient overvoltage sensitivity and carry out distributed phase modulation machine reactive control based on distributed phase modulation machine reactive control, include:
4-a) sensitivity ofiSequencing from big to small, and determining the control sequence of each distributed phase modulator according to the sequencing;
4-b) checking one by one according to the control sequence of the distributed phase modulators by step length Delta QjdAnd increasing the transient voltage rise of the new energy after the direct current commutation fails under the condition of static reactive output until the transient overvoltage of the new energy is eliminated or the maximum static reactive output of all the distributed phase modulators is reached.
And finally, outputting static reactive output values of the centralized phase modulators and the distributed phase modulators and control result information.
The invention also provides a reactive power coordination control device of the centralized and distributed phase modulators, which comprises:
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 future T time section and determining a reactive power control strategy of the centralized phase modulator;
the first calculation module is used for calculating the sensitivity of the distributed phase modulator for reactive control suppression of the transient overvoltage of the new energy;
and the number of the first and second groups,
and the second strategy module is used for suppressing the transient overvoltage sensitivity of the new energy based on the reactive control of the distributed phase modulator to perform the reactive control of the distributed phase modulator.
The first policy module is specifically configured to,
based on the electromechanical simulation data of the power grid of the future T time section, performing simulation check on whether the new energy in the near area is transient overvoltage or not after continuous commutation failure of direct current of a new energy collection sending end;
if so, determining the maximum group number of the direct current system alternating current filter replacement according to the static reactive power regulation upper limit of the centralized phase modulator and the single group capacity of the direct current system alternating current filter;
sequentially checking the reactive power output of the centralized phase modulator to replace N groups of direct current system alternating current filters, and after a direct current continuous commutation failure fault occurs, performing new energy transient voltage level until the problem of new energy transient overvoltage is solved or the maximum group number of the direct current system alternating current filters is replaced; wherein N is 1,2 …;
and outputting static fixed and reactive output of the centralized phase modulator.
The first policy module is specifically configured to,
the calculation is performed as follows:
wherein Q ismaxFor static reactive regulation upper limit, Q, of a centralized phase modulatorfFor a single set of capacity of AC filters in DC systems, n represents QmaxAnd QfInteger obtained by division, QrIs QmaxAnd QfA remainder obtained by the division;
when Q isrWhen the number of the replacement groups of the alternating current filter of the direct current system is 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n;
when Q isrWhen not equal to 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n +1 groups.
The first policy module is specifically configured to,
if the problem of transient overvoltage of new energy is solved when N is m, then,
when m is less than or equal to n, the static constant and reactive power output of the centralized phase modulator is mxQf；
When m is more than n, the static constant and reactive power output of the centralized phase modulator is Qmax；
Wherein Q isrWhen 0, m ∈ (1,2 … n); qrWhen not equal to 0, m is equal to (1,2 … n + 1);
if the reactive power output replacement of the centralized phase modulator reaches the maximum group number of the AC filter replacement of the DC system, the problem of transient overvoltage of new energy still existsIf the output power of the centralized phase modulator is Q, the static constant and reactive power output of the centralized phase modulator is Qmax。
The second policy module is specifically configured to,
sequencing static reactive power output suppression new energy transient voltage rising sensitivity of the distributed phase modulators from large to small, and determining a control sequence of each distributed phase modulator according to the sequencing;
checking the step length delta Q one by one according to the control sequence of the distributed phase modulatorjdIncreasing the transient voltage rise of the new energy after the direct current commutation failure under the condition of increasing the static reactive output until the transient overvoltage of the new energy is eliminated or the maximum static reactive output of all distributed phase modulators is reached;
and outputting static reactive power output values and control result information of all the distributed phase modulators participating in reactive power control.
It is to be noted that the apparatus embodiment corresponds to the method embodiment, and the implementation manners of the method embodiment are all applicable to the apparatus embodiment and can achieve the same or similar technical effects, so that the details are not described herein.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above 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 (12)
1. A reactive power coordination control method for a centralized phase modulator and a distributed phase modulator is characterized by comprising the following steps:
based on the electromechanical simulation data of the power grid of the future T time section, the transient overvoltage of the new energy is judged, and a reactive power control strategy of the centralized phase modulator is determined;
if the reactive power control strategy of the centralized phase modulator does not meet the requirement of suppressing the transient overvoltage of the new energy, calculating the sensitivity of the distributed phase modulator for reactive power control suppression of the transient overvoltage of the new energy;
and carrying out reactive control on the distributed phase modulator based on the sensitivity of reactive control on the new energy transient overvoltage of the distributed phase modulator.
2. The method for controlling the reactive power coordination of the centralized phase modulator and the distributed phase modulator according to claim 1, wherein the step of determining the reactive power control strategy of the centralized phase modulator by judging the transient overvoltage of the new energy based on the electromechanical simulation data of the power grid in the future T time section comprises the following steps:
based on the electromechanical simulation data of the power grid of the future T time section, performing simulation check on whether the new energy in the near area is transient overvoltage or not after continuous commutation failure of direct current of a new energy collection sending end;
if so, determining the maximum group number of the direct current system alternating current filter replacement according to the static reactive power regulation upper limit of the centralized phase modulator and the single group capacity of the direct current system alternating current filter;
sequentially checking the reactive power output of the centralized phase modulator to replace N groups of direct current system alternating current filters, and after a direct current continuous commutation failure fault occurs, performing new energy transient voltage level until the problem of new energy transient overvoltage is solved or the maximum group number of the direct current system alternating current filters is replaced; wherein N is 1,2 …;
and outputting static fixed and reactive output of the centralized phase modulator.
3. The method for controlling reactive power coordination of a centralized phase modulator and a distributed phase modulator according to claim 2, wherein the step of determining the maximum number of the permutations of the ac filter of the dc system according to the upper limit of the static reactive power regulation of the centralized phase modulator and the single-group capacity of the ac filter of the dc system comprises:
wherein Q ismaxFor static reactive regulation upper limit, Q, of a centralized phase modulatorfFor a single set of capacity of AC filters in DC systems, n represents QmaxAnd QfInteger obtained by division, QrIs QmaxAnd QfA remainder obtained by the division;
when Q isrWhen the number of the replacement groups of the alternating current filter of the direct current system is 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n;
when Q isrWhen not equal to 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n +1 groups.
4. The method for controlling reactive power coordination of a centralized phase modulator and a distributed phase modulator according to claim 2, wherein the new energy transient overvoltage problem is solved by:
in the transient process of the new energy, the new energy unit does not exceed the highest withstand voltage value.
5. The method of claim 3, wherein outputting the static var output of the centralized phase modulator comprises:
if the problem of transient overvoltage of new energy is solved when N is m, then,
when m is less than or equal to n, the static constant and reactive power output of the centralized phase modulator is mxQf；
When m is more than n, the static constant and reactive power output of the centralized phase modulator is Qmax；
Wherein Q isrWhen 0, m ∈ (1,2 … n); qrWhen not equal to 0, m is equal to (1,2 … n + 1);
if the problem of transient overvoltage of new energy still exists when the reactive power output replacement of the centralized phase modulator reaches the maximum group number of the replacement of the alternating current filter of the direct current system, the static constant reactive power output of the centralized phase modulator is Qmax。
6. The method for controlling reactive power coordination of a centralized phase modulator and a distributed phase modulator according to claim 1, wherein the step of calculating reactive power control of the distributed phase modulator to suppress transient overvoltage sensitivity of new energy comprises the following steps:
λi＝ΔVid/ΔQid，
wherein the content of the first and second substances,λisuppression of new energy transient voltage rise sensitivity, Δ Q, for phase modulator static reactive power output of site iidFor increased static reactive power output, Δ V, of the phase modifier at site iidThe transient state voltage rise change of the new energy at the place i after the continuous commutation failure occurs in the direct current is 1,2 … M, and M is the number of the distributed phase modulators;
ΔVidthe calculation is as follows:
wherein the content of the first and second substances,
representing the transient state voltage rise of new energy after the fault of direct current commutation failure occurs in the operation mode of the power grid before the reactive power output of the distributed phase modulator is increased,
representing the increase in reactive power output Δ Q of a distributed phase modulator implemented in situidAnd transient voltage rise of the new energy after the direct current commutation failure fault in the later power grid operation mode.
7. The method for controlling reactive power coordination of a centralized phase modulator and a distributed phase modulator according to claim 6, wherein the step of suppressing transient overvoltage sensitivity of new energy for reactive power control of the distributed phase modulator comprises:
sequencing static reactive power output suppression new energy transient voltage rising sensitivity of the distributed phase modulators from large to small, and determining a control sequence of each distributed phase modulator according to the sequencing;
checking the step length delta Q one by one according to the control sequence of the distributed phase modulatorjdIncreasing the transient voltage rise of the new energy after the direct current commutation failure under the condition of increasing the static reactive output until the transient overvoltage of the new energy is eliminated or the maximum static reactive output of all distributed phase modulators is reached;
and outputting static reactive power output values and control result information of all the distributed phase modulators participating in reactive power control.
8. A centralized and distributed phase modulator reactive power coordination control device is characterized by 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 future T time section and determining a reactive power control strategy of the centralized phase modulator;
the first calculation module is used for calculating the sensitivity of the distributed phase modulator for reactive control suppression of the transient overvoltage of the new energy;
and the number of the first and second groups,
and the second strategy module is used for suppressing the transient overvoltage sensitivity of the new energy based on the reactive control of the distributed phase modulator to perform the reactive control of the distributed phase modulator.
9. The apparatus according to claim 8, wherein the first strategy module is specifically configured to,
based on the electromechanical simulation data of the power grid of the future T time section, performing simulation check on whether the new energy in the near area is transient overvoltage or not after continuous commutation failure of direct current of a new energy collection sending end;
if so, determining the maximum group number of the direct current system alternating current filter replacement according to the static reactive power regulation upper limit of the centralized phase modulator and the single group capacity of the direct current system alternating current filter;
sequentially checking the reactive power output of the centralized phase modulator to replace N groups of direct current system alternating current filters, and after a direct current continuous commutation failure fault occurs, performing new energy transient voltage level until the problem of new energy transient overvoltage is solved or the maximum group number of the direct current system alternating current filters is replaced; wherein N is 1,2 …;
and outputting static fixed and reactive output of the centralized phase modulator.
10. The apparatus according to claim 9, wherein the first strategy module is specifically configured to,
the calculation is performed as follows:
wherein Q ismaxFor static reactive regulation upper limit, Q, of a centralized phase modulatorfFor a single set of capacity of AC filters in DC systems, n represents QmaxAnd QfInteger obtained by division, QrIs QmaxAnd QfA remainder obtained by the division;
when Q isrWhen the number of the replacement groups of the alternating current filter of the direct current system is 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n;
when Q isrWhen not equal to 0, the maximum number of the replacement groups of the alternating current filter of the direct current system is n +1 groups.
11. The apparatus according to claim 10, wherein the first strategy module is specifically configured to,
if the problem of transient overvoltage of new energy is solved when N is m, then,
when m is less than or equal to n, the static constant and reactive power output of the centralized phase modulator is mxQf；
When m is more than n, the static constant and reactive power output of the centralized phase modulator is Qmax；
Wherein Q isrWhen 0, m ∈ (1,2 … n); qrWhen not equal to 0, m is equal to (1,2 … n + 1);
if the problem of transient overvoltage of new energy still exists when the reactive power output replacement of the centralized phase modulator reaches the maximum group number of the replacement of the alternating current filter of the direct current system, the static constant reactive power output of the centralized phase modulator is Qmax。
12. The apparatus according to claim 8, wherein the second strategy module is specifically configured to,
sequencing static reactive power output suppression new energy transient voltage rising sensitivity of the distributed phase modulators from large to small, and determining a control sequence of each distributed phase modulator according to the sequencing;
checking the step length delta Q one by one according to the control sequence of the distributed phase modulatorjdIncreasing the transient voltage rise of the new energy after the direct current commutation failure under the condition of increasing the static reactive output until the transient overvoltage of the new energy is eliminated or the maximum static reactive output of all distributed phase modulators is reached;
and outputting static reactive power output values and control result information of all the distributed phase modulators participating in reactive power control.
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