CN113852142B - Multi-voltage-level static and dynamic reactive power configuration method for multi-direct-current feed-in power grid - Google Patents
Multi-voltage-level static and dynamic reactive power configuration method for multi-direct-current feed-in power grid Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention relates to a multi-voltage-level static and dynamic reactive power configuration method of a multi-direct-current feed-in power grid, which can be used for carrying out coordination configuration between static reactive power compensation and dynamic reactive power compensation capacity, realizing configuration of the multi-voltage-level static and dynamic reactive power compensation capacity of the multi-direct-current feed-in power grid, meeting the basic requirements of the power grid on capacitive reactive power compensation and inductive reactive power compensation in different operation modes, improving the dynamic reactive power supporting capability of a power grid system, and providing reference judgment basis for reasonably planning the reactive power configuration of the multi-direct-current feed-in power grid and the like.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a multi-voltage-level static and dynamic reactive power configuration method for a multi-direct-current feed-in power grid.
Background
The static reactive power bears the basic compensation function of reactive power layering partition balance, meets the basic requirements of the power grid on capacitive reactive power compensation and inductive reactive power compensation in different operation modes, and is mainly used for improving the dynamic reactive power supporting capability of a power grid system, wherein the dynamic reactive power compensation of a 220kV and above voltage class power grid is mainly used for providing dynamic reactive power supporting in the transient process of the power grid system, reducing the risk of feed-in direct current commutation failure and improving the voltage stability level of the power grid; the dynamic reactive compensation of the power grid with the voltage class of 110kV and below is mainly used for improving the voltage quality of users and participating in reactive balance regulation and control of a foundation.
Therefore, a multi-voltage-level static and dynamic reactive power compensation configuration research is required for the multi-direct current feed-in power grid so as to meet the power grid operation requirement.
Disclosure of Invention
The invention aims to provide a multi-voltage-level static and dynamic reactive power configuration method for a multi-direct-current feed-in power grid, so as to realize the configuration of multi-voltage-level static and dynamic reactive power compensation capacity of the multi-direct-current feed-in power grid, and provide a reference judgment basis for reasonably planning the reactive power configuration of the multi-direct-current feed-in power grid and the like.
In order to achieve the above objective, an embodiment of the present invention provides a multi-voltage-level static-dynamic reactive power configuration method for a multi-dc feed-in power grid, including the following steps:
s10, determining power grid information;
step S20, under a large-load mode of the power grid, carrying out reactive balance analysis based on the power grid information to determine the maximum requirement of the power grid on static capacitive reactive compensation, and configuring the initial capacity of the static capacitive reactive compensation of the power grid according to the principle of layered and partitioned balance;
step S30, under a small load mode of the power grid, determining the maximum requirement of the power grid for static inductive reactive compensation based on the power grid information, and configuring the initial capacity of the static inductive reactive compensation of the power grid according to the principle of layering and partitioning balance;
step S40, based on the power grid information, the static capacitive reactive power compensation initial capacity and the static inductive reactive power compensation initial capacity, respectively carrying out static N-1 on-off analysis on a large load mode and a small load mode of the power grid so as to check whether the reactive voltage of the power grid meets the operation requirement; if so, outputting the static capacitive reactive compensation initial capacity and the static inductive reactive compensation initial capacity as final static capacitive reactive compensation capacity and static inductive reactive compensation capacity, otherwise, adjusting the static capacitive reactive compensation initial capacity and the static inductive reactive compensation initial capacity until the reactive voltage of the power grid meets the operation requirement, and outputting the static capacitive reactive compensation capacity and the static inductive reactive compensation capacity meeting the operation requirement as final static capacitive reactive compensation capacity and static inductive reactive compensation capacity;
step S50, based on the power grid information, performing transient N-1 and transient N-2 stability check on a large load mode and a small load mode of the power grid respectively, determining weak links of dynamic reactive power support of a system by combining the influence of faults on direct current operation, and configuring initial capacity of a dynamic reactive power compensation device;
step S60, based on the power grid information and the initial capacity of the dynamic reactive power compensation device, respectively performing transient N-1 and transient N-2 stability check on a large load mode and a small load mode of the power grid again to determine whether the reactive voltage of the power grid meets the stability requirement; if yes, outputting the initial capacity of the dynamic reactive power compensation device as the capacity of the final dynamic reactive power compensation device, otherwise, adjusting the initial capacity of the dynamic reactive power compensation device until the reactive voltage of the power grid meets the stability requirement, and outputting the capacity of the dynamic reactive power compensation device meeting the stability requirement as the capacity of the final dynamic reactive power compensation device;
step S70, performing unipolar locking and bipolar locking check on direct current which is accessed to a power grid, determining whether a weak link of dynamic reactive power support exists in the power grid according to a check result, if so, adjusting the dynamic reactive power compensation capacity until the weak link of the dynamic reactive power support does not exist, and outputting a preliminary configuration scheme of the dynamic reactive power compensation; and if the dynamic reactive compensation configuration scheme does not exist, outputting the dynamic reactive compensation configuration scheme.
Preferably, the step S70 specifically includes:
the output dynamic reactive power compensation configuration scheme comprises a plurality of dynamic reactive power compensation configuration schemes;
the method further comprises the steps of:
and S80, calculating economic index values of the dynamic reactive power compensation configuration schemes, and selecting a scheme with the optimal economic index value as a final dynamic reactive power compensation configuration scheme according to the economic index values.
Preferably, the economic index value is calculated as follows:
wherein K is Dynamic state Economic index value R of dynamic reactive power compensation configuration scheme for configuration Investment in Cost, Q, generated for a configured dynamic reactive compensation scheme Dynamic state And a configuration scheme for configured dynamic reactive power compensation.
Preferably, the step S20 specifically includes:
the capacitive reactive compensation capacity of the transformer substation with the voltage class of 330kV and above is configured according to 10-20% of the capacity of the main transformer, namely Q Static high C ＝S e height * (0.1 to 0.2); wherein Q is Static high C For the capacitive reactive compensation capacity of a transformer substation with the voltage class of 330kV and above, S e height The main transformer capacity of the transformer substation is 330kV and above;
the capacitive reactive compensation capacity of the transformer substation of 220kV and below is as follows: q (Q) Static low C ＝1.15Q D -Q G -Q R -Q L The method comprises the steps of carrying out a first treatment on the surface of the Wherein Q is D For the maximum natural reactive load of the power grid, Q G Reactive power of the power grid generator, Q R Reactive power input to main network and adjacent network, Q L Charging power for the lines and cables.
Preferably, the step S30 specifically includes:
the initial capacity of the static inductive reactive compensation of the power grid is Q Static R ＝Q L -Q c ；
Wherein Q is Static R For static inductive reactive compensation of initial capacity, Q of power grid C For reactive losses of lines and transformers, Q L For the charging power of the line,
I * is the current per unit value of a line or a transformer, X is the line reactance or the transformer leakage reactance, S B For reference capacity, U * The per-unit value of the line voltage is represented by B, which is the susceptance of the cable.
The embodiment of the invention provides a coordination configuration method between static reactive power compensation and dynamic reactive power compensation capacity, realizes the configuration of the static reactive power compensation capacity and the dynamic reactive power compensation capacity of multiple voltage levels of a multi-direct current feed-in power grid, can meet the basic requirements of the power grid on the capacitive reactive power compensation and the inductive reactive power compensation in different operation modes, improves the dynamic reactive power supporting capability of a power grid system, and can provide reference judgment basis for reasonably planning the reactive power configuration of the multi-direct current feed-in power grid and the like.
Additional features and advantages of embodiments of the invention will be set forth in the description which follows.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a multi-voltage-level static-dynamic reactive power configuration method for a multi-dc feed-in power grid according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a power grid structure according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of positive power of the direct current ZL1 after an N-2 fault occurs on the BUS8 side of the BUS8-BUS9 line in the power grid structure of fig. 2 in the embodiment of the present invention.
Fig. 4 is a schematic diagram of low-voltage suspension on the BUS14 BUS 110 side caused by bipolar latch-up fault of the power grid structure dc ZL1 in fig. 2 according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the disclosure will be described in detail below with reference to the drawings. In addition, numerous specific details are set forth in the following examples in order to provide a better illustration of the invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known means have not been described in detail in order to not obscure the present invention.
Referring to fig. 1, a simplified flow chart of a multi-voltage-level static-dynamic reactive power configuration method for a multi-dc feed-in power grid according to an embodiment of the present invention is shown, and referring to fig. 1, the method according to the embodiment of the present invention includes the following steps:
s10, determining power grid information;
specifically, the power grid information refers to determining basic boundary conditions such as grid frame, load level, startup and the like of a power grid research target year based on current and distant planning;
step S20, under a large-load mode of the power grid, carrying out reactive balance analysis based on the power grid information to determine the maximum requirement of the power grid on static capacitive reactive compensation, and configuring the initial capacity of the static capacitive reactive compensation of the power grid according to the principle of layered and partitioned balance;
in particular reactive compensation Q of the grid as a whole Tonifying device The calculation formula is as follows:
Q tonifying device ＝Q Static C +Q Static R +Q Dynamic state
Wherein Q is Static C For static capacitive reactive compensation capacity, Q Static R For a static inductive reactive compensation capacity,
Q dynamic state For dynamic reactive compensation capacity.
Q Static C ＝Q Static high C +Q Static low C
Wherein Q is Static high C Static capacitive reactive compensation capacity for voltage class of 330kV and above, Q Static low C Static capacitive reactive compensation capacity of 220kV and below voltage class;
specifically, the capacitive reactive compensation capacity of the transformer substation with the voltage class of 330kV and above is configured according to 10-20% of the capacity of the main transformer, namely Q Static high C ＝S e height * (0.1 to 0.2); wherein Q is Static high C For the capacitive reactive compensation capacity of a transformer substation with the voltage class of 330kV and above, S e height The main transformer capacity of the transformer substation is 330kV and above;
specifically, the reactive power compensation device configured for the 35-220 kV transformer substation can meet the following conditions of high-voltage side power factor under the conditions of peak load and low-valley load: cos phi is more than or equal to 0.95 at peak load and less than or equal to 0.95 at low load;
the capacitive reactive compensation capacity of the transformer substation of 220kV and below is as follows: q (Q) Static low C ＝1.15Q D -Q G -Q R -Q L The method comprises the steps of carrying out a first treatment on the surface of the Wherein Q is D For the maximum natural reactive load of the power grid, Q G Reactive power of the power grid generator, Q R Reactive power input to main network and adjacent network, Q L For wiring and electricityThe charging power of the cable;
step S30, under a small load mode of the power grid, determining the maximum requirement of the power grid for static inductive reactive compensation based on the power grid information, and configuring the initial capacity of the static inductive reactive compensation of the power grid according to the principle of layering and partitioning balance;
specifically, the low-voltage side shunt reactor of the main transformer with the voltage class of 35 kV-220 kV and above in the power grid mainly compensates the residual charging power of the ultra-high voltage transmission line; namely, in the embodiment, the static inductive reactive compensation capacity of the power grid refers to the static inductive reactive compensation capacity of voltage class of 35 kV-220 kV and above;
specifically, the static inductive reactive compensation capacity of the power grid is Q Static R ＝Q L -Q c ；
Wherein Q is Static R For static inductive reactive compensation capacity of power grid, Q C For reactive losses of lines and transformers, Q L For the charging power of the line,
I * is the current per unit value of a line or a transformer, X is the line reactance or the transformer leakage reactance, S B For reference capacity, U * The per-unit value of the line voltage is represented by B, which is the susceptance of the cable.
Step S40, based on the power grid information, the static capacitive reactive power compensation initial capacity and the static inductive reactive power compensation initial capacity, respectively carrying out static N-1 on-off analysis on a large load mode and a small load mode of the power grid so as to check whether the reactive voltage of the power grid meets the operation requirement; if so, outputting the static capacitive reactive compensation initial capacity and the static inductive reactive compensation initial capacity as final static capacitive reactive compensation capacity and static inductive reactive compensation capacity, otherwise, adjusting the static capacitive reactive compensation initial capacity and the static inductive reactive compensation initial capacity until the reactive voltage of the power grid meets the operation requirement, and outputting the static capacitive reactive compensation capacity and the static inductive reactive compensation capacity meeting the operation requirement as final static capacitive reactive compensation capacity and static inductive reactive compensation capacity;
step S50, based on the power grid information, performing transient N-1 and transient N-2 stability check on a large load mode and a small load mode of the power grid respectively, determining weak links of dynamic reactive power support of a system by combining the influence of faults on direct current operation, and configuring initial capacity of a dynamic reactive power compensation device;
specifically, transient N-1 stable check and transient N-2 stable check can be performed based on a power grid large load mode, and then transient N-1 stable check and transient N-2 stable check can be performed based on a power grid small load mode; transient N-1 stability check and transient N-2 stability check are the conventional safety check mode of the power grid, so that redundant description is omitted here; the dynamic reactive power compensation device is a dynamic reactive power compensation device such as a camera, an SVC, a STATCOM (SVG) and the like in a power grid;
step S60, based on the power grid information and the initial capacity of the dynamic reactive power compensation device, respectively performing transient N-1 and transient N-2 stability check on a large load mode and a small load mode of the power grid again to determine whether the reactive voltage of the power grid meets the stability requirement; if yes, outputting the initial capacity of the dynamic reactive power compensation device as the capacity of the final dynamic reactive power compensation device, otherwise, adjusting the initial capacity of the dynamic reactive power compensation device until the reactive voltage of the power grid meets the stability requirement, and outputting the capacity of the dynamic reactive power compensation device meeting the stability requirement as the capacity of the final dynamic reactive power compensation device;
step S70, performing unipolar locking and bipolar locking check on direct current which is accessed to a power grid, determining whether a weak link of dynamic reactive power support exists in the power grid according to a check result, if so, adjusting the dynamic reactive power compensation capacity until the weak link of the dynamic reactive power support does not exist, and outputting a preliminary configuration scheme of the dynamic reactive power compensation; if not, outputting a dynamic reactive power compensation configuration scheme; wherein the output dynamic reactive compensation configuration scheme may include one or more dynamic reactive compensation configuration schemes;
and S80, if a plurality of dynamic reactive power compensation configuration schemes exist, calculating economic index values of the dynamic reactive power compensation configuration schemes, and selecting a scheme with the optimal economic index value as a final dynamic reactive power compensation configuration scheme according to the economic index values.
Specifically, the economic index value is calculated as follows:
wherein K is Dynamic state Economic index value R of dynamic reactive power compensation configuration scheme for configuration Investment in Cost, Q, generated for a configured dynamic reactive compensation scheme Dynamic state A configuration scheme for the configured dynamic reactive compensation;
it should be noted that, in the embodiment of the invention, by comparing the economic indexes of the dynamic reactive power compensation configuration of different reactive power compensation configuration schemes, a scheme with larger economic indexes is selected to obtain the reactive power compensation configuration scheme with maximized economic benefit.
The embodiment of the invention provides a coordination configuration method between static reactive power compensation and dynamic reactive power compensation capacity, realizes the configuration of the static reactive power compensation capacity and the dynamic reactive power compensation capacity of multiple voltage levels of a multi-direct current feed-in power grid, can meet the basic requirements of the power grid on the capacitive reactive power compensation and the inductive reactive power compensation in different operation modes, improves the dynamic reactive power supporting capability of a power grid system, and can provide reference judgment basis for reasonably planning the reactive power configuration of the multi-direct current feed-in power grid and the like.
The static and dynamic reactive power configuration method of the embodiment of the invention is described below by taking the power grid structure of fig. 2 as an example;
selecting a summer-large mode and a summer-small mode based on the current and distant view planning;
under the large load mode, the general interval of static capacitive reactive compensation is calculated through a formula, and then the specific static capacitive reactive compensation capacity of each main transformer is determined according to the principle of layering and partitioning balance.
The calculation formula of the static capacitive reactive compensation capacity of the system high-voltage transformer substation is as follows:
Q static height C ＝S e height *(0.1～0.2)
The calculation formula of the static capacitive reactive compensation capacity of the system low-voltage transformer substation is as follows:
Q static low C ＝1.15Q D -Q G -Q R -Q L
Reactive balance analysis is carried out on the large load mode, and the configuration capacity of the low-voltage capacitor is adjusted until the reactive power requirement is met;
under the small load mode, the approximate interval of static inductive reactive compensation is calculated through a formula, and then the specific static inductive reactive compensation capacity of each main transformer is determined according to the principle of layering and partitioning balance.
The calculation formula of the static inductive reactive compensation capacity of the system is as follows:
Q static R ＝Q L -Q c
Reactive balance analysis is carried out on the small load mode, and the configuration capacity of the low-voltage reactor is adjusted until the reactive requirement is met;
based on the result of static reactive power configuration, static N-1 break analysis is carried out on a large-load mode and a small-load mode of the power grid, whether the power grid voltage meets the requirement of operation regulation is checked, the initial capacity of static capacitive reactive power compensation and the initial capacity of static inductive reactive power compensation are adjusted and corrected, and the final capacity of static capacitive reactive power compensation and the final capacity of static inductive reactive power compensation are determined.
Under different modes, transient N-1 and N-2 stability check is carried out on a power grid, weak links of dynamic reactive power support of a system are determined by combining the influence of faults on direct current operation, and initial capacities of dynamic reactive power compensation devices such as a regulator, SVC (static var generator), STATCOM (SVG) and the like are configured.
After the N-2 fault occurs on the BUS8 side of the BUS8-BUS9 line, continuous commutation failure of the direct current ZL1 can be caused, the positive power of the direct current ZL1 after the fault is shown in FIG. 3, and the SVG device with the capacity of 15Mvar is arranged on the BUS14, so that the commutation failure times of the direct current ZL1 can be reduced from three times to one time.
Performing transient stability again until the requirement of the system stability level is met;
performing unipolar locking and bipolar locking check on direct current accessed to a power grid, determining weak links of other dynamic reactive power supports possibly existing in the system, and adjusting and correcting the dynamic reactive power compensation capacity to obtain a dynamic reactive power compensation primary configuration scheme;
after the bipolar locking fault of the direct current ZL1 occurs, the low-voltage suspension of the side voltage of the BUS14 BUS 110 is caused, as shown in fig. 4, and the SVC device with the capacity of 15Mvar installed on the BUS6 can improve the side voltage of the BUS14 BUS 110 from 0.4p.u. to 1p.u.;
and calculating the economic index of the dynamic reactive power compensation preliminary configuration scheme to obtain a scheme with optimal economic index.
In the example, two dynamic reactive power optimization configuration schemes are provided, wherein the first scheme is to install an SVG device with the capacity of 15Mvar at the BUS14 and an SVC device with the capacity of 15Mvar at the BUS6, the second scheme is to install an SVG device with the capacity of 20Mvar at the BUS14 and an SVC device with the capacity of 10Mvar at the BUS6, and the economic index K of the two schemes is calculated Dynamic state The first scheme is 8.333, and the second scheme is 10, so that the optimization scheme 1 is more economical and reasonable.
Based on the above, a comprehensive configuration scheme of static and dynamic reactive power of multiple voltage levels of the multi-direct-current feed-in power grid is finally obtained.
Table 1 2 reactive configuration scheme comparison
Table 2A reactive power configuration scheme (Mvar) of a grid employing a multiple DC feed grid multiple voltage level static and dynamic reactive power comprehensive configuration scheme
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (5)
1. The multi-voltage-level static and dynamic reactive power configuration method for the multi-direct-current feed-in power grid is characterized by comprising the following steps of:
s10, determining power grid information;
step S20, under a large-load mode of the power grid, carrying out reactive balance analysis based on the power grid information to determine the maximum requirement of the power grid on static capacitive reactive compensation, and configuring the initial capacity of the static capacitive reactive compensation of the power grid according to the principle of layered and partitioned balance;
step S30, under a small load mode of the power grid, determining the maximum requirement of the power grid for static inductive reactive compensation based on the power grid information, and configuring the initial capacity of the static inductive reactive compensation of the power grid according to the principle of layering and partitioning balance;
step S40, based on the power grid information, the static capacitive reactive power compensation initial capacity and the static inductive reactive power compensation initial capacity, respectively carrying out static N-1 on-off analysis on a large load mode and a small load mode of the power grid so as to check whether the reactive voltage of the power grid meets the operation requirement; if so, outputting the static capacitive reactive compensation initial capacity and the static inductive reactive compensation initial capacity as final static capacitive reactive compensation capacity and static inductive reactive compensation capacity, otherwise, adjusting the static capacitive reactive compensation initial capacity and the static inductive reactive compensation initial capacity until the reactive voltage of the power grid meets the operation requirement, and outputting the static capacitive reactive compensation capacity and the static inductive reactive compensation capacity meeting the operation requirement as final static capacitive reactive compensation capacity and static inductive reactive compensation capacity;
step S50, based on the power grid information, performing transient N-1 and transient N-2 stability check on a large load mode and a small load mode of the power grid respectively, determining weak links of dynamic reactive power support of a system by combining the influence of faults on direct current operation, and configuring initial capacity of a dynamic reactive power compensation device;
step S60, based on the power grid information and the initial capacity of the dynamic reactive power compensation device, respectively performing transient N-1 and transient N-2 stability check on a large load mode and a small load mode of the power grid again to determine whether the reactive voltage of the power grid meets the stability requirement; if yes, outputting the initial capacity of the dynamic reactive power compensation device as the capacity of the final dynamic reactive power compensation device, otherwise, adjusting the initial capacity of the dynamic reactive power compensation device until the reactive voltage of the power grid meets the stability requirement, and outputting the capacity of the dynamic reactive power compensation device meeting the stability requirement as the capacity of the final dynamic reactive power compensation device;
step S70, performing unipolar locking and bipolar locking check on direct current which is accessed to a power grid, determining whether a weak link of dynamic reactive power support exists in the power grid according to a check result, if so, adjusting the dynamic reactive power compensation capacity until the weak link of the dynamic reactive power support does not exist, and outputting a preliminary configuration scheme of the dynamic reactive power compensation; and if the dynamic reactive compensation configuration scheme does not exist, outputting the dynamic reactive compensation configuration scheme.
2. The multi-voltage-level static and dynamic reactive power configuration method of a multi-dc-fed power grid according to claim 1, wherein the step S70 specifically comprises:
the output dynamic reactive power compensation configuration scheme comprises a plurality of dynamic reactive power compensation configuration schemes;
the method further comprises the steps of:
and S80, calculating economic index values of the dynamic reactive power compensation configuration schemes, and selecting a scheme with the optimal economic index value as a final dynamic reactive power compensation configuration scheme according to the economic index values.
3. The multi-voltage-level static and dynamic reactive power configuration method of a multi-direct-current feed-in power grid according to claim 2, wherein the economic index value is calculated as follows:
wherein K is Dynamic state Economic index value R of dynamic reactive power compensation configuration scheme for configuration Investment in Cost, Q, generated for a configured dynamic reactive compensation scheme Dynamic state And a configuration scheme for configured dynamic reactive power compensation.
4. The multi-voltage-level static and dynamic reactive power configuration method of a multi-dc-fed power grid according to claim 1, wherein the step S20 specifically comprises:
the capacitive reactive compensation capacity of the transformer substation with the voltage class of 330kV and above is configured according to 10-20% of the capacity of the main transformer, namely Q Static high C ＝S e height * (0.1 to 0.2); wherein Q is Static high C For the capacitive reactive compensation capacity of a transformer substation with the voltage class of 330kV and above, S e height The main transformer capacity of the transformer substation is 330kV and above;
the capacitive reactive compensation capacity of the transformer substation of 220kV and below is as follows: q (Q) Static low C ＝1.15Q D -Q G -Q R -Q L The method comprises the steps of carrying out a first treatment on the surface of the Wherein Q is D For the maximum natural reactive load of the power grid, Q G Reactive power of the power grid generator, Q R Reactive power input to main network and adjacent network, Q L Charging power for the lines and cables.
5. The multi-voltage-level static and dynamic reactive power configuration method of the multi-dc-fed power grid according to claim 1, wherein the step S30 specifically comprises:
the initial capacity of the static inductive reactive compensation of the power grid is Q Static R ＝Q L -Q c ；
Wherein Q is Static R For static inductive reactive compensation of initial capacity, Q of power grid C For reactive losses of lines and transformers, Q L For the charging power of the line,
is the current per unit value of a line or a transformer, X is the line reactance or the transformer leakage reactance, S B For reference capacity, U * The per-unit value of the line voltage is represented by B, which is the susceptance of the cable.
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| CN103094905A (en) * | 2013-01-07 | 2013-05-08 | 广东电网公司电网规划研究中心 | Selection method of dynamic reactive power compensation configuration point |
| CN104538972A (en) * | 2014-12-12 | 2015-04-22 | 国网宁夏电力公司经济技术研究院 | Reactive compensation configuration method and device based on transient voltage stability constraint |
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