CN111725815B - Configuration method of synchronous phase modulator of extra-high voltage direct current weak receiving end power grid - Google Patents
Configuration method of synchronous phase modulator of extra-high voltage direct current weak receiving end power grid Download PDFInfo
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Abstract
The invention discloses a method for configuring a synchronous phase modulator of an extra-high voltage direct current weak receiving end power grid, which comprises the following steps: and establishing an optimal configuration model of the synchronous phase modulator, wherein the optimal configuration model comprises the steps of considering the number of configurable phase modulators of a transformer substation, the rotating reserve capacity of the generator set, the transient voltage stability of the receiving-end power grid and other constraint conditions on the basis of reducing the rotating reserve capacity of the generator set reserved for keeping the transient voltage stability of the weak receiving-end power grid. Determining the optimal configuration node sequence of the phase modulator in the weak receiving end power grid according to the sensitivity relation between the rotating reserve capacity of the generator set and the node dynamic reactive configuration capacity; and solving the optimal configuration number and capacity of the phase modulator in the weak receiving end power grid by utilizing the optimal configuration node sequencing and an iteration method. The method can effectively improve the transient voltage supporting effect of the phase modulator on the weak receiving end power grid, releases the rotating reserve capacity of the generator set, improves the load carrying capacity of the generator set during the load peak period, and has good engineering application value.
Description
Technical Field
The invention relates to the technical field of dynamic reactive power configuration, in particular to a method for configuring a synchronous phase modulator of an extra-high voltage direct current weak receiving end power grid.
Background
With the development of an extra-high voltage direct-current transmission system and the improvement of transmission power, the problem of voltage stability of a direct-current receiving-end power grid is increasingly highlighted. The method is mainly embodied in the condition that extra-high voltage direct current is generally fed into a load-intensive area, reactive power required in the quick recovery process of phase commutation failure of the extra-high voltage direct current is greatly increased, so that the dynamic reactive power support of a power grid in the load-intensive area is insufficient, and the voltage instability risk of a receiving-end power grid is high. At present, the configuration of dynamic reactive compensation equipment in an extra-high voltage direct-current weak receiving end power grid is an effective measure for improving the transient voltage stability level of the power grid. The dynamic reactive power compensation equipment mainly comprises a synchronous phase modulator, a static synchronous compensator and the like. How to realize the optimal configuration of the dynamic reactive compensation equipment in the weak receiving end power grid, especially the configuration of the synchronous phase modulator has important practical significance for improving the voltage stability of the extra-high voltage direct current weak receiving end power grid.
At present, the configuration of a synchronous phase modulator is mainly used for improving the transient voltage stability level of a system and suppressing transient overvoltage at home and abroad. The method considers that the fault resistance of the extra-high voltage direct current system is improved by optimizing and configuring the phase modulator, and the configuration of the synchronous phase modulator is less optimized from the perspective of actual requirements of an extra-high voltage direct current weak receiving end power grid.
In consideration of the main aims of the configuration of the synchronous phase modulator in the prior art, namely, the stability of the transient voltage of a system is improved and the transient overvoltage is restrained, so that the configuration of the synchronous phase modulator is not optimized according to the overall requirement of the voltage stability of an extra-high voltage direct-current weak receiving-end power grid, and the voltage supporting effect of the fast reactive power regulation capability of the phase modulator on the receiving-end power grid is difficult to fully exert.
Disclosure of Invention
Based on the technical problems, the invention provides a configuration method of a synchronous phase modulator of an extra-high voltage direct-current weak receiving end power grid, which is an optimal configuration model of the synchronous phase modulator of the weak receiving end power grid based on reduction of the rotating reserve capacity of a generator set, effectively improves the transient voltage supporting effect of the phase modulator on the weak receiving end power grid, reduces the rotating reserve capacity of the generator set, improves the load capacity of the generator set during a load peak period, and meets the social power utilization requirements.
In order to solve the problems, the invention provides a configuration method of a synchronous phase modulator of an extra-high voltage direct current weak receiving end power grid, which comprises the following steps:
step S1: the method comprises the steps that the number of reserved generator set rotation reserve capacity and phase modulator configuration units reserved for keeping the transient voltage stability of a weak receiving end power grid is reduced as an optimization target, the number of transformer substation configurable phase modulators, the set rotation reserve capacity and the transient voltage stability of the receiving end power grid are taken as constraint conditions, and an optimal configuration model of a synchronous phase modulator of the extra-high voltage direct current weak receiving end power grid is established;
step S2: sensitivity relation coefficient S of rotation reserve capacity and node dynamic reactive power configuration capacity of generator set is obtained by utilizing perturbation methodjDetermining the optimal configuration node sequence S of the phase modulator in the weak receiving end power gridsj；
Step S3: based on the optimal configuration model of synchronous phase modifier in step S1 and the optimal configuration node sequence S in step S2sjAnd in consideration of the size of the total rotating reserve capacity of the generator set, an iteration method is adopted to obtain the optimal configuration points and the number of the phase modulators in the weak receiving end power grid.
Further, step S1 specifically includes:
step S1.1: establishing a target function of a synchronous phase modulator in the configuration of the extra-high voltage direct current weak receiving end power grid by using the minimum deviation of the rotation reserve capacity and the expected value of the extra-high voltage direct current weak receiving end power grid generator set and the minimum number of the configured synchronous phase modulators:
wherein, Presi、PrefiRespectively reserving rotary spare capacity and expected value thereof for the generator set; n is a radical ofsjThe number of synchronous phase modulators configured for the node j; lambda [ alpha ]1、λ2Cost weighting coefficients configured for the generator set rotating reserve capacity and the synchronous phase modulator respectively; m, M,N is the number of generators and the number of nodes of the power grid reserved for rotation.
Step S1.2: establishing constraint conditions of the synchronous phase modulator in the configuration of the extra-high voltage direct current weak receiving end power grid by using a system dynamic model equation, the number of the phase modulators with configurable nodes, the rotating reserve capacity of a generator set, the transient voltage stability of the receiving end power grid and the like:
Nsj≤Ns max j (3)
Pr min i≤Presi≤Pr max i (4)
Vs(tf)≥0.8p.u.,tf≥10s (5)
wherein, Prmaxi、PrminiThe upper limit and the lower limit of the reserved rotary reserve capacity for the generator set respectively; n is a radical ofsmax jThe maximum configurable number of synchronous phase modulators for the node j; vsIs the node voltage, tfThe time after the system fault is removed; x is a system state variable, including excitation potential, power angle, angular speed and induction motor slip of a generator or a synchronous phase modulator; y is an algebraic variable and comprises line power, load power and power exchanged by the direct current receiving end system and the power grid;
step S1.3: and (3) establishing an optimal configuration model of the synchronous phase modulator of the extra-high voltage direct current weak receiving end power grid based on the formulas (1) - (5) based on the objective function and the constraint condition in the step (S1.1) and the step (S1.2).
Further, step S2 specifically includes:
step S2.1: dynamic reactive capacity delta Q configured at weak receiving end power grid node j by perturbation methodsjThe sensitivity relation S between the deviation of the rotating reserve capacity of the generator set and the dynamic reactive power configuration capacity is obtained based on time domain simulationj
Wherein, Δ PresiReserving the deviation of the rotary reserve capacity for the generator set;
step S2.2: sensitivity relation S based on step S2.1jWill SjThe medium elements are sequenced from large to small to form an optimal configuration node sequence S of the phase modulator in a weak receiving end power gridsj＝[(S1,bus1),…,(Sj,bus j),…,(SM,bus M)]And bus j represents the j-th weak receiving end power grid node.
Further, step S3 specifically includes:
step S3.1: optimal configuration node sequence S based on step S2.2sjForming a configuration scheme N of a synchronous phase modulator in a weak receiving end power grid under the condition of satisfying the formula (3)c＝[(bus j,Nsj)]，Nsj＝Nsmax j，j＝1；
Step S3.2: phase modulator configuration scheme NcUnder the condition of meeting the transient voltage stability requirement of the formula (5), the rotating standby total capacity P of the generator set is obtainedtresChecking the total capacity P of the generator set for reserve rotationtresWhether or not the formula (7) is satisfied, if PtresIf the formula (7) is not satisfied, the process goes to step S3.3; if P istresIf the formula (7) is satisfied, the process goes to step S3.4;
(Ptres-Ptref)/Ptref≥ε,0≤ε≤0.05 (7)
wherein, PtrefA desired value of a total reserve capacity for the generator set rotation;
step S3.3: adjusting the configuration scheme of the synchronous phase modulator in the weak receiving end power grid, and configuring the optimal configuration node sequence SsjAdding the node corresponding to the jth element to the configuration scheme N of the synchronous phase modulatorcIn (i) Nc＝[(bus 1,Nsmax1),...,(bus j,Nsj)]，Nsj＝Nsmax jJ ═ j +1, jump to step S3.2;
step S3.4: optimizing the configuration scheme of the synchronous phase modulator in a weak receiving end power grid, and reducing the number of the configured synchronous phase modulators at a node j, Nsj＝Nsj-1, i.e. synchronous condenser arrangementTable Nc＝[(bus 1,Nsmax 1),...,(bus j,Nsj-1)]；
Step S3.5: phase modulator configuration scheme NcUnder the condition of meeting the transient voltage stability requirement of the formula (5), the rotating standby total capacity P of the generator set is obtainedtresAnd checking PtresWhether or not formula (7) is satisfied; if P istresIf equation (7) is satisfied, the process proceeds to step S3.4, if P is satisfiedtresIf the formula (7) is not satisfied, the optimal configuration scheme N of the synchronous phase modulator in the weak receiving end power grid is obtainedcopt＝[(bus 1,Nsmax 1),…,(bus j,Nsj-1)]。
In addition, the invention also discloses a synchronous phase modulator configuration system of the extra-high voltage direct current weak receiving end power grid, which comprises the following steps:
at least one processor and at least one memory communicatively coupled to the processor, wherein: the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform a configuration method as in any one of the above.
Furthermore, a non-transitory computer-readable storage medium storing computer instructions for causing the computer to perform the configuration method of any one of the above is disclosed.
The invention provides a configuration method of a synchronous phase modulator of an extra-high voltage direct current weak receiving end power grid, and compared with the prior art, the configuration method has the following advantages and beneficial effects:
1) the invention provides a synchronous phase modulator configuration method taking reduction of the rotating reserve capacity of a generator set as a core aiming at the problem of configuration of a synchronous phase modulator of an extra-high voltage direct-current weak receiving end power grid, and firstly, establishing an optimal configuration model of the synchronous phase modulator by taking reduction of the reserved rotating reserve capacity of the generator set and the number of the phase modulator configuration tables for keeping the transient voltage of the weak receiving end power grid stable as targets; then, solving the sensitivity relation between the rotating reserve capacity of the generator set and the dynamic reactive power configuration capacity of the nodes by using a perturbation method, and determining the optimal configuration node sequence of the phase modulator in the weak receiving end power grid; and finally, solving the optimal configuration point and the optimal number of the phase modulators in the weak receiving end power grid by adopting an iteration method. Therefore, the configuration method is simple and effective, has small calculation amount and is suitable for being realized by software.
2) The method fully considers the voltage stabilization requirement of an extra-high voltage direct current weak receiving end power grid, designs a phase modulator configuration model based on reduction of the rotation reserve capacity of a generator set, determines the optimal configuration sequence of a synchronous phase modulator in the weak receiving end power grid by using the deviation amount of the rotation reserve capacity of the generator set and the sensitivity of dynamic reactive power configuration capacity, provides an optimal configuration method of the synchronous phase modulator based on an iteration method, considers the rotation reserve capacity of the weak receiving end power grid and the transient voltage stabilization requirement, reduces the rotation reserve capacity reserved for voltage stabilization of the generator set, improves the load carrying capacity of the generator set during load peak, and has good popularization and application values.
Drawings
FIG. 1 is a flow chart of a configuration method of a synchronous phase modulator of an extra-high voltage direct current weak receiving end power grid in the invention;
FIG. 2 is a schematic diagram of a load center power grid structure of an actual extra-high voltage direct current weak receiving end power grid;
fig. 3 shows the voltage response results for three different phase modulator configurations in the example.
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings and examples, in which the technical problems and advantages of the present invention are solved, wherein the described examples are only intended to facilitate the understanding of the present invention, and are not to be construed as limiting in any way.
The invention provides a method for configuring a synchronous phase modulator of an extra-high voltage direct current weak receiving end power grid based on technical problems which are difficult to find.
The present invention will be further described with reference to the following specific examples.
As shown in fig. 1, a method for configuring a synchronous phase modulator of an extra-high voltage direct-current weak receiving-end power grid includes the following steps:
step S1: the method comprises the steps of establishing an optimal configuration model of the synchronous phase modulator of the extra-high voltage direct current weak receiving end power grid by taking reduction of the reserved rotating reserve capacity of the generator set and the number of the phase modulator configuration units for keeping the transient voltage of the weak receiving end power grid stable as an optimization target and using constraint conditions of the number of the phase modulators configurable by a transformer substation, the rotating reserve capacity of the generator set and the transient voltage stability of the receiving end power grid.
Step S1 specifically includes, in the implementation process:
step S1.1: establishing a target function of a synchronous phase modulator in the configuration of the extra-high voltage direct current weak receiving end power grid by using the minimum deviation of the rotation reserve capacity and the expected value of the extra-high voltage direct current weak receiving end power grid generator set and the minimum number of the configured synchronous phase modulators:
wherein, Presi、PrefiRespectively reserving rotary spare capacity and expected value thereof for the generator set; n is a radical ofsjThe number of synchronous phase modulators configured for the node j; lambda [ alpha ]1、λ2Cost weighting coefficients configured for the generator set rotating reserve capacity and the synchronous phase modulator respectively; m, N the number of generators and the number of nodes of the power grid reserved for rotation are respectively.
Step S1.2: establishing constraint conditions of the synchronous phase modulator in the configuration of the extra-high voltage direct current weak receiving end power grid by using a system dynamic model equation, the number of the phase modulators with configurable nodes, the rotating reserve capacity of a generator set, the transient voltage stability of the receiving end power grid and the like:
Nsj≤Ns max j (3)
Pr min i≤Presi≤Pr max i (4)
Vs(tf)≥0.8p.u.,tf≥10s (5)
wherein, Prmaxi、PrminiThe upper limit and the lower limit of the reserved rotary reserve capacity for the generator set respectively; n is a radical ofsmax jThe maximum configurable number of synchronous phase modulators for the node j; vsIs the node voltage, tfThe time after the system fault is removed; x is a system state variable, including excitation potential, power angle, angular speed and induction motor slip of a generator or a synchronous phase modulator; and y is an algebraic variable and comprises line power, load power and power exchanged by the direct current receiving end system and the power grid.
Step S1.3: and (3) establishing an optimal configuration model of the synchronous phase modulator of the extra-high voltage direct current weak receiving end power grid, namely the formulas (1) - (5), based on the objective function and the constraint condition in the step (S1.1) and the step (S1.2).
Step S2: and (3) solving a sensitivity relation coefficient between the rotating reserve capacity of the generator set and the node dynamic reactive power configuration capacity by using a perturbation method, and determining the optimal configuration node sequence of the phase modulator in the weak receiving end power grid.
Specifically, step S2 specifically includes, in the implementation process:
step S2.1: dynamic reactive capacity delta Q configured at weak receiving end power grid node j by perturbation methodsjThe sensitivity relation S between the deviation of the rotating reserve capacity of the generator set and the dynamic reactive power configuration capacity is obtained based on time domain simulationj；
Wherein, Δ PresiAnd reserving deviation of the rotary spare capacity for the generator set.
Step S2.2: sensitivity relation S based on step S2.1jWill SjThe medium elements are sequenced from large to small to form an optimal configuration node sequence S of the phase modulator in a weak receiving end power gridsj＝[(S1,bus1),…,(Sj,bus j),…,(SM,bus M)]；
Step S3: based on the optimal configuration model of the synchronous phase modulator established in step S1 and the optimal configuration node ranking S described in step S2sjAnd in consideration of the size of the total rotating reserve capacity of the generator set, an iteration method is adopted to obtain the optimal configuration points and the number of the phase modulators in the weak receiving end power grid.
Step S3 specifically includes, in the implementation process:
step S3.1: optimal configuration node sequence S based on step S2.2sjForming a configuration scheme N of a synchronous phase modulator in a weak receiving end power grid under the condition of satisfying the formula (3)c＝[(bus j,Nsj)]，Nsj＝Nsmax j，j＝1；
Step S3.2: phase modulator configuration scheme NcUnder the condition of meeting the transient voltage stability requirement of the formula (5), the rotating standby total capacity P of the generator set is obtainedtresChecking the total capacity P of the generator set for reserve rotationtresWhether or not the formula (7) is satisfied, if PtresIf the formula (7) is not satisfied, the process goes to step S3.3; if P istresIf the formula (7) is satisfied, the process goes to step S3.4;
(Ptres-Ptref)/Ptref≥ε,0≤ε≤0.05 (7)
wherein, PtrefA desired value of a total reserve capacity for the generator set rotation;
step S3.3: adjusting the configuration scheme of the synchronous phase modulator in the weak receiving end power grid, and configuring the optimal configuration node sequence SsjAdding the node corresponding to the jth element to the configuration scheme N of the synchronous phase modulatorcIn (i) Nc＝[(bus 1,Nsmax1),…,(bus j,Nsj)]，Nsj＝Ns max jJ ═ j +1, jump to step S3.2;
step S3.4: optimizing the configuration scheme of the synchronous phase modulator in a weak receiving end power grid, and reducing the number of the configured synchronous phase modulators at a node j, Nsj＝Nsj1, i.e. synchronous phase modulator configuration Nc＝[(bus 1,Nsmax1),…,(bus j,Nsj-1)]。
Step S3.5: phase modifierScheme NcUnder the condition of meeting the transient voltage stability requirement of the formula (5), the rotating standby total capacity P of the generator set is obtainedtresAnd checking PtresWhether or not formula (7) is satisfied; if P istresIf equation (7) is satisfied, the process proceeds to step S3.4, if P is satisfiedtresIf the formula (7) is not satisfied, the optimal configuration scheme N of the synchronous phase modulator in the weak receiving end power grid is obtainedcopt＝[(bus 1,Nsmax1),…,(bus j,Nsj-1)]。
The advantages and benefits of the present invention will be further illustrated below with respect to a certain application as an example.
Fig. 2 is a schematic diagram of a load center power grid structure of an actual extra-high voltage direct-current weak receiving end power grid. In the system, an extra-high voltage direct current system transmits 5500MW, and in order to keep the transient voltage of a direct current receiving end power grid stable, the rotating standby total capacity of a generator set is about 3000 MW. The reserved rotating reserve capacity for keeping the voltage stable is reduced to be not more than 1000MW by configuring a synchronous phase modulator with the rated capacity of 300Mvar at a 500kV substation in a load center.
When a three-phase ground fault occurs in a line GH and the fault line is cut off after 0.1S, calculating by utilizing time domain simulation and an equation (6) to obtain a sensitivity relation S between the deviation amount of the rotating reserve capacity of the generator set and the dynamic reactive power configuration capacityj：
Ssj＝[(1.86,bus C),(1.67,bus E),(1.6,bus K),(1.6,bus B),(1.35,bus L),(1.28,bus A),(1.26,bus L),(1.17,bus K),(1.17,bus G)]
Considering the configurable number of phase modulators at each 500kV site (as shown in the following table 1), the optimal configuration scheme of the phase modulators in the receiving-end power grid is obtained by an iterative method as follows:
Nsopt＝[(bus C,1),(bus K,2),(bus B,1)]
maximum configurable number of synchronous phase modulators of 1500 kV station
| Site | A | B | C | D | E | F |
| Ns max j | 1 | 1 | 1 | 0 | 0 | 1 |
| Site | G | H | K | L | R | |
| Ns max j | 0 | 1 | 2 | 2 | 0 |
In order to compare the advantages of the configuration scheme of the synchronous phase modulator designed by the invention, the following three configuration schemes of the synchronous phase modulator are selected:
scheme 1: inventive configuration scheme Nsopt＝[(bus C,1),(bus K,2),(bus B,1)]；
Scheme 2: configuration scheme Ns2＝[(bus K,2),(bus G,1),(bus L,l)]；
Scheme 3: configuration scheme Ns2＝[(bus C,1),(bus K,2)]。
In simulation, an extra-high voltage direct current system transmits 5500MW, and the total rotating reserve capacity of a load center thermal power generating unit is about 1000 MW. And (3) fault setting: when t is 1s, the line GH has a three-phase ground fault, and after 0.1s, the fault line GH is cut off. The node voltage variation curves of the 3 synchronous phase modulator configurations under the above-mentioned fault are shown in fig. 3.
In case of scheme 1, when t is 2.5s, the node voltage returns to 0.8p.u. or higher. In case of scheme 2, when t is 3.5s, the node voltage returns to 0.8p.u. or higher. In case 3, the node voltage cannot be restored to 0.8p.u. or higher. It can be seen that under the same unit rotation reserve capacity, the voltage recovery speed of the scheme 1 is faster than that of the scheme 2, and the node voltage of the scheme 3 is directly unstable. Therefore, the configuration scheme 1 of the synchronous phase modulator provided by the invention is superior to the scheme 2 and the scheme 3, namely, the rotating reserve capacity of the generator is reduced from 3000MW to within 1000MW on the premise of keeping the voltage of a receiving-end power grid stable.
It should be noted that the above configuration method can be executed as a software program or computer instructions in a non-transitory computer readable storage medium or in a control system with a memory and a processor. Each functional unit in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit. The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, the description is as follows: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A configuration method of a synchronous phase modulator of an extra-high voltage direct current weak receiving end power grid is characterized by comprising the following steps:
step S1: the method comprises the steps that the number of reserved generator set rotation reserve capacity and phase modulator configuration units reserved for keeping the transient voltage stability of a weak receiving end power grid is reduced as an optimization target, the number of transformer substation configurable phase modulators, the set rotation reserve capacity and the transient voltage stability of the receiving end power grid are taken as constraint conditions, and an optimal configuration model of a synchronous phase modulator of the extra-high voltage direct current weak receiving end power grid is established; the method specifically comprises the following steps:
step S1.1: establishing a target function of a synchronous phase modulator in the configuration of the extra-high voltage direct current weak receiving end power grid by using the minimum deviation of the rotation reserve capacity and the expected value of the extra-high voltage direct current weak receiving end power grid generator set and the minimum number of the configured synchronous phase modulators:
wherein, Presi、PrefiRespectively reserving rotary spare capacity and expected value thereof for the generator set; n is a radical ofsjThe number of synchronous phase modulators configured for the node j; lambda [ alpha ]1、λ2Cost weighting coefficients configured for the generator set rotating reserve capacity and the synchronous phase modulator respectively; m, N the number of the reserved rotary standby generators and the number of the reserved power grid nodes are respectively;
step S1.2: establishing constraint conditions of the synchronous phase modulator in the configuration of the extra-high voltage direct current weak receiving end power grid by using a system dynamic model equation, the number of the phase modulators configurable by nodes, the rotating reserve capacity of a generator set and the transient voltage stability of the receiving end power grid:
Nsj≤Nsmaxj (3)
Prmini≤Presi≤Prmaxi (4)
Vs(tf)≥0.8p.u.,tf≥10s (5)
wherein, Prmaxi、PrminiThe upper limit and the lower limit of the reserved rotary reserve capacity for the generator set respectively; n is a radical ofsmax jThe maximum configurable number of synchronous phase modulators for the node j; vsIs the node voltage, tfThe time after the system fault is removed; x is a system state variable, including excitation potential, power angle, angular speed and induction motor slip of a generator or a synchronous phase modulator; y is an algebraic variable and comprises line power, load power and power exchanged by the direct current receiving end system and the power grid;
step S1.3: establishing an optimal configuration model of the synchronous phase modulator of the extra-high voltage direct current weak receiving end power grid based on the formulas (1) - (5) based on the objective function and the constraint condition in the step S1.1 and the step S1.2;
step S2: sensitivity relation coefficient S of rotation reserve capacity and node dynamic reactive power configuration capacity of generator set is obtained by utilizing perturbation methodjEnsure thatOptimal configuration node sequencing S of fixed modulation camera in weak receiving end power gridsj；
Step S3: based on the optimal configuration model of synchronous phase modifier in step S1 and the optimal configuration node sequence S in step S2sjAnd in consideration of the size of the total rotating reserve capacity of the generator set, an iteration method is adopted to obtain the optimal configuration points and the number of the phase modulators in the weak receiving end power grid.
2. The method for configuring the synchronous phase modulator of the extra-high voltage direct current weak receiving end power grid according to claim 1, wherein the step S2 specifically includes:
step S2.1: dynamic reactive capacity delta Q configured at weak receiving end power grid node j by perturbation methodsjThe sensitivity relation S between the deviation of the rotating reserve capacity of the generator set and the dynamic reactive power configuration capacity is obtained based on time domain simulationj
Wherein, Δ PresiReserving the deviation of the rotary reserve capacity for the generator set;
step S2.2: sensitivity relation S based on step S2.1jWill SjThe medium elements are sequenced from large to small to form an optimal configuration node sequence S of the phase modulator in a weak receiving end power gridsj＝[(S1,bus 1),…,(Sj,bus j),…,(SM,bus M)]And bus j represents the j-th weak receiving end power grid node.
3. The method for configuring the synchronous phase modulator of the extra-high voltage direct current weak receiving end power grid according to claim 2, wherein the step S3 specifically includes:
step S3.1: optimal configuration node sequence S based on step S2.2sjForming a configuration scheme N of a synchronous phase modulator in a weak receiving end power grid under the condition of satisfying the formula (3)c＝[(bus j,Nsj)]，Nsj＝Nsmaxj，j＝1；
Step S3.2: phase modulator configuration scheme NcUnder the condition of meeting the transient voltage stability requirement of the formula (5), the rotating standby total capacity P of the generator set is obtainedtresChecking the total capacity P of the generator set for reserve rotationtresWhether or not the formula (7) is satisfied, if PtresIf the formula (7) is not satisfied, the process goes to step S3.3; if P istresIf the formula (7) is satisfied, the process goes to step S3.4;
(Ptres-Ptref)/Ptref≥ε,0≤ε≤0.05 (7)
wherein, PtrefA desired value of a total reserve capacity for the generator set rotation;
step S3.3: adjusting the configuration scheme of the synchronous phase modulator in the weak receiving end power grid, and configuring the optimal configuration node sequence SsjAdding the node corresponding to the jth element to the configuration scheme N of the synchronous phase modulatorcIn (i) Nc＝[(bus 1,Nsmax1),…,(bus j,Nsj)]，Nsj＝NsmaxjJ ═ j +1, jump to step S3.2;
step S3.4: optimizing the configuration scheme of the synchronous phase modulator in a weak receiving end power grid, and reducing the number of the configured synchronous phase modulators at a node j, Nsj＝Nsj1, i.e. synchronous phase modulator configuration Nc＝[(bus 1,Nsmax1),…,(bus j,Nsj-1)]；
Step S3.5: phase modulator configuration scheme NcUnder the condition of meeting the transient voltage stability requirement of the formula (5), the rotating standby total capacity P of the generator set is obtainedtresAnd checking PtresWhether or not formula (7) is satisfied; if P istresIf equation (7) is satisfied, the process proceeds to step S3.4, if P is satisfiedtresIf the formula (7) is not satisfied, the optimal configuration scheme N of the synchronous phase modulator in the weak receiving end power grid is obtainedcopt＝[(bus 1,Nsmax1),…,(bus j,Nsj-1)]。
4. The utility model provides a synchronous phase modulation machine configuration system of weak receiving end electric wire netting of extra-high voltage direct current which characterized in that includes:
at least one processor and at least one memory communicatively coupled to the processor, wherein: the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the configuration method of the synchronous phase modulator of the extra-high voltage direct current weak receiving end power grid according to any one of claims 1 to 3.
5. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method of configuring the synchronous phase modulator of an extra-high voltage dc weak grid according to any one of claims 1 to 3.
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