CN113489071A - Method and system for calculating input capacity of extra-high voltage direct current receiving end alternating current filter - Google Patents

Method and system for calculating input capacity of extra-high voltage direct current receiving end alternating current filter Download PDF

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CN113489071A
CN113489071A CN202110670850.2A CN202110670850A CN113489071A CN 113489071 A CN113489071 A CN 113489071A CN 202110670850 A CN202110670850 A CN 202110670850A CN 113489071 A CN113489071 A CN 113489071A
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capacity value
extra
high voltage
input capacity
receiving end
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Inventor
潘艳
姜懿郎
赵伟
高熠莹
李付强
秦晓辉
董烨
张玉红
徐鹏
吴俊玲
代倩
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China Electric Power Research Institute Co Ltd CEPRI
North China Grid Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
North China Grid Co Ltd
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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
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • 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
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a method and a system for calculating the input capacity of an extra-high voltage direct current receiving end alternating current filter. The method and the system acquire an active power value injected into an alternating current power grid by the extra-high voltage direct current receiving end converter station, calculate an input capacity value of an alternating current filter of the extra-high voltage direct current receiving end converter station based on the active power value, obtain reactive power exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid by inputting the calculated input capacity value into the alternating current filter through load flow calculation, and determine an optimal input capacity value of the alternating current filter of the extra-high voltage direct current receiving end converter station after carrying out multiple iterations on the process. According to the method and the system, an iteration method is adopted, and an accurate optimal input capacity value of an alternating current filter in the extra-high voltage direct current receiving end converter station can be quickly obtained under the condition that an electromagnetic transient simulation tool is not used for carrying out fine modeling on the extra-high voltage direct current, so that the stability of a power system is greatly improved.

Description

Method and system for calculating input capacity of extra-high voltage direct current receiving end alternating current filter
Technical Field
The invention relates to the technical field of extra-high voltage power transmission, in particular to a method and a system for calculating the input capacity of an extra-high voltage direct current receiving end alternating current filter.
Background
In the simulation analysis and operation control of the extra-high voltage alternating current and direct current power grid, the method highly depends on an important parameter of filter configuration quantity in the extra-high voltage direct current converter station. However, in the current planning design and engineering operation process, the filter parameters in the extra-high voltage direct current converter station are generally obtained only at the end of the feasibility research stage. If the configuration quantity of the filter is selected according to the existing empirical formula, the deviation between the obtained simulation result and the actual operation is large, the load flow calculation is easy to be not converged, and the development of the stability research of the power system is seriously influenced.
Therefore, a technology is needed to quickly and accurately acquire the input capacity of a filter in the extra-high voltage direct current receiving end converter station at the ground planning stage of the extra-high voltage direct current converter station.
Disclosure of Invention
In order to solve the problems that in the prior art, the input capacity of a filter in an extra-high voltage direct current converter station can only be determined at the end of a feasibility research stage, and the stability of a power system is influenced by selecting according to an empirical formula, the invention provides a method for calculating the input capacity of an alternating current filter at an extra-high voltage direct current receiving end, which comprises the following steps:
acquiring an active power value injected into an alternating current power grid by an extra-high voltage direct current receiving end converter station;
calculating a first input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the active power value and a preset input coefficient;
according to the active power value and the first input capacity value, performing load flow calculation by using a load flow program to obtain first passive exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into an alternating current filter according to the first input capacity value;
calculating a second input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value and the first reactive exchange;
according to the active power value and the second input capacity value, load flow calculation is carried out by using a load flow program, and second reactive power exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into the alternating current filter according to the second input capacity value is obtained;
calculating a third input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the first reactive power exchange and the second reactive power exchange;
according to the active power value and the third input capacity value, load flow calculation is carried out by using a load flow program, and third reactive power exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into the alternating current filter according to the third input capacity value is obtained;
and calculating the optimal input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive exchange, the second reactive exchange and the third reactive exchange.
Further, the first input capacity value of the extra-high voltage direct current receiving end alternating current filter is calculated according to the active power value and a preset input coefficient, and the calculation formula is as follows:
Qfilt,1＝k*Pconv
in the formula, PconvIs the active power value Q of the extra-high voltage DC receiving end converter station injected into the AC power gridfilt,1Is the first input capacity value of the extra-high voltage DC receiving end AC filter, k is the preset input coefficient, 0<k<1。
Further, the second input capacity value of the extra-high voltage dc receiving ac filter is calculated according to the first input capacity value and the first reactive exchange, and the calculation formula is:
Qfilt,2＝Qfilt,1+Qswap,1
in the formula, Qfilt,1And Qfilt,2Respectively is the first input capacity value, Q of the extra-high voltage DC receiving end AC filterswap,1The first reactive exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid is realized.
Further, the third input capacity value of the extra-high voltage dc receiving ac filter is calculated according to the first input capacity value, the second input capacity value, the first reactive power exchange and the second reactive power exchange, and the calculation formula is as follows:
Qfilt,3＝(Qswap,1*Qfilt,2-Qswap,2*Qfilt,1)/(Qswap,1-Qswap,2)
in the formula, Qfilt,1，Qfilt,2And Qfilt,3Respectively a first input capacity value, a second input capacity value and a third input capacity value Q of the extra-high voltage direct current receiving end alternating current filterswap,1And Qswap,2The first reactive exchange and the second reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
Further, the optimal input capacity value of the extra-high voltage direct current receiving end alternating current filter is calculated according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive power switching, the second reactive power switching and the third reactive power switching, and the calculation formula is as follows:
Figure BDA0003115039680000031
in the formula, Qfilt，Qfilt,1，Qfilt,2And Qfilt,3Respectively the optimal input capacity value, the first input capacity value, the second input capacity value and the third input capacity value of the extra-high voltage direct current receiving end alternating current filter, Qswap,1，Qswap,2And Qswap,3The first reactive exchange, the second reactive exchange and the third reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
According to another aspect of the present invention, the present invention provides a system for calculating the input capacity of an extra-high voltage dc receiving ac filter, the system comprising:
the data acquisition unit is used for acquiring an active power value injected into an alternating current power grid by the extra-high voltage direct current receiving end converter station;
the first capacity unit is used for calculating a first input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the active power value and a preset input coefficient;
the first reactive unit is used for carrying out load flow calculation by using a load flow program according to the active power value and a first input capacity value to obtain first reactive exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into an alternating current filter according to the first input capacity value;
a second capacity unit, which is used for calculating a second input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value and the first reactive exchange;
the second reactive power unit is used for carrying out load flow calculation by using a load flow program according to the active power value and a second input capacity value to obtain second reactive power exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into the alternating current filter according to the second input capacity value;
a third capacity unit, which is used for calculating a third input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the first reactive exchange and the second reactive exchange;
the third reactive power unit is used for carrying out load flow calculation by using a load flow program according to the active power value and a third input capacity value to obtain third reactive power exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into an alternating current filter according to the third input capacity value;
and the optimal capacity unit is used for calculating the optimal input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive exchange, the second reactive exchange and the third reactive exchange.
Further, the first capacity unit calculates a first input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the active power value and a preset input coefficient, and a calculation formula of the first capacity unit is as follows:
Qfilt,1＝k*Pconv
in the formula, PconvIs the active power value Q of the extra-high voltage DC receiving end converter station injected into the AC power gridfilt,1Is the first input capacity value of the extra-high voltage DC receiving end AC filter, k is the preset input coefficient, 0<k<1。
Further, the second capacity unit calculates a second input capacity value of the extra-high voltage dc receiving ac filter according to the first input capacity value and the first reactive exchange, and the calculation formula is:
Qfilt,2＝Qfilt,1+Qswap,1
in the formula, Qfilt,1And Qfilt,2Respectively is the first input capacity value, Q of the extra-high voltage DC receiving end AC filterswap,1The first reactive exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid is realized.
Further, the third capacity unit calculates a third input capacity value of the extra-high voltage dc receiving ac filter according to the first input capacity value, the second input capacity value, the first reactive power exchange and the second reactive power exchange, and the calculation formula is as follows:
Qfilt,3＝(Qswap,1*Qfilt,2-Qswap,2*Qfilt,1)/(Qswap,1-Qswap,2)
in the formula, Qfilt,1，Qfilt,2And Qfilt,3Respectively a first input capacity value, a second input capacity value and a third input capacity value Q of the extra-high voltage direct current receiving end alternating current filterswap,1And Qswap,2The first reactive exchange and the second reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
Further, the optimal capacity unit calculates the optimal input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive power exchange, the second reactive power exchange and the third reactive power exchange, and the calculation formula is as follows:
Figure BDA0003115039680000051
in the formula, Qfilt，Qfilt,1，Qfilt,2And Qfilt,3Respectively the optimal input capacity value, the first input capacity value, the second input capacity value and the third input capacity value of the extra-high voltage direct current receiving end alternating current filter, Qswap,1，Qswap,2And Qswap,3The first reactive exchange, the second reactive exchange and the third reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
The method and the system for calculating the input capacity of the extra-high voltage direct current receiving end alternating current filter provided by the technical scheme of the invention acquire the active power value injected into an alternating current power grid by the extra-high voltage direct current receiving end converter station, calculate the input capacity value of the extra-high voltage direct current receiving end converter station alternating current filter based on the active power value, obtain the reactive power exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid by inputting the calculated input capacity value into the alternating current filter through load flow calculation, and determine the optimal input capacity value of the extra-high voltage direct current receiving end converter station alternating current filter after carrying out multiple iterations on the process. The method and the system fully consider that in actual operation, the voltage amplitude of the extra-high voltage direct current converter bus is kept near the rated voltage; during the operation of the extra-high voltage direct current converter station, the reactive power is converted into zero as much as possible, namely, the reactive power of the alternating current power grid injected into the converter transformer through the public connection bus is kept to be zero as much as possible; and the convergence of numerical value iteration in the calculation process of the input quantity of the filter in the extra-high voltage direct current converter station is accelerated by utilizing a linear or even higher-frequency interpolation means, so that the accurate optimal input capacity value of the alternating current filter in the extra-high voltage direct current receiving end converter station can be quickly obtained by adopting an iteration method under the condition of not using an electromagnetic transient simulation tool to finely model extra-high voltage direct current, and the stability of a power system is greatly improved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow chart of a method for calculating the input capacity of an extra-high voltage DC receiving end AC filter according to a preferred embodiment of the invention;
fig. 2 is a schematic structural diagram of a system for calculating the input capacity of an extra-high voltage dc receiving end ac filter according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method for calculating the input capacity of an extra-high voltage dc receiving ac filter according to a preferred embodiment of the present invention. As shown in fig. 1, a method 100 for calculating the input capacity of an extra-high voltage dc-receiving ac filter according to the preferred embodiment starts with step 101.
In step 101, an active power value injected into an alternating current power grid by an extra-high voltage direct current receiving end converter station is collected. An automatic dispatching system is arranged in the power grid, and the active power value injected into the alternating current power grid by the extra-high voltage direct current receiving end converter station can be directly collected through the automatic dispatching system.
In step 102, a first input capacity value of the extra-high voltage direct current receiving end alternating current filter is calculated according to the active power value and a preset input coefficient.
Preferably, the first input capacity value of the extra-high voltage dc receiving-end ac filter is calculated according to the active power value and a preset input coefficient, and the calculation formula is as follows:
Qfilt,1＝k*Pconv
in the formula, PconvIs the active power value Q of the extra-high voltage DC receiving end converter station injected into the AC power gridfilt,1Is the first input capacity value of the extra-high voltage DC receiving end AC filter, k is the preset input coefficient, 0<k<1. In practical application, through verification, when the k value is 0.4 or 0.6, the calculated and determined optimal input capacity value of the alternating current filter is more beneficial to the stability of a power grid system.
In the preferred embodiment, the active power value P is collected whenconvIs 3000MW, when the value is 0.6, the first input capacity value Q is calculatedfilt,1Is 2400 Mvar.
In step 103, a power flow program is used for carrying out power flow calculation according to the active power value and the first input capacity value, and first reactive exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid after the extra-high voltage direct current receiving end converter station is input into the alternating current filter according to the first input capacity value is obtained.
The first input capacity value Qfilt,12400Mvar is put into an alternating current filter to perform load flow calculation, and a first reactive exchange Q can be determinedswap,1It was-125.8 Mvar.
And 104, calculating a second input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value and the first reactive exchange.
Preferably, the second input capacity value of the extra-high voltage dc receiving ac filter is calculated according to the first input capacity value and the first reactive power exchange, and the calculation formula is:
Qfilt,2＝Qfilt,1+Qswap,1
in the formula, Qfilt,1And Qfilt,2Respectively is the first input capacity value, Q of the extra-high voltage DC receiving end AC filterswap,1The first reactive exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid is realized.
And substituting the first input capacity value 2400Mvar and the first reactive exchange-125.8 Mvar into a calculation formula for calculating a second input capacity value to obtain the second input capacity value 2274 Mvar.
And 105, performing load flow calculation by using a load flow program according to the active power value and the second input capacity value to obtain second reactive power exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid after the extra-high voltage direct current receiving end converter station is input into the alternating current filter according to the second input capacity value.
The second input capacity value Qfilt,22274Mvar is fed into the AC filter for load flow calculation to determine a second reactive exchange Qswap,2The molecular weight was 17.5 Mvar.
And 106, calculating a third input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the first reactive exchange and the second reactive exchange.
Preferably, the third input capacity value of the extra-high voltage dc receiving ac filter is calculated according to the first input capacity value, the second input capacity value, the first reactive power exchange and the second reactive power exchange, and the calculation formula is:
Qfilt,3＝(Qswap,1*Qfilt,2-Qswap,2*Qfilt,1)/(Qswap,1-Qswap,2)
in the formula, Qfilt,1，Qfilt,2And Qfilt,3Respectively a first input capacity value, a second input capacity value and a third input capacity value Q of the extra-high voltage direct current receiving end alternating current filterswap,1And Qswap,2The first reactive exchange and the second reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
The first input capacity value 2400Mvar, the first reactive exchange-125.8 Mvar and the second input capacity value Qfilt,22274Mvar and second reactive exchange Qswap,2The third input capacity value is 2289Mvar by substituting 17.5Mvar into the calculation formula for calculating the third input capacity value.
In step 107, load flow calculation is performed by using a load flow program according to the active power value and the third input capacity value, and third reactive power exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid after the extra-high voltage direct current receiving end converter station is input into the alternating current filter according to the third input capacity value is obtained.
Putting the third input capacity value Qfilt,22289Mvar is applied to an AC filter for load flow calculation to determine a third reactive exchange Qswap,2It was 0.4 Mvar.
And 108, calculating the optimal input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive exchange, the second reactive exchange and the third reactive exchange.
Preferably, the optimal input capacity value of the extra-high voltage direct current receiving end alternating current filter is calculated according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive power switching, the second reactive power switching and the third reactive power switching, and the calculation formula is as follows:
Figure BDA0003115039680000081
in the formula, Qfilt，Qfilt,1，Qfilt,2And Qfilt,3Respectively the optimal input capacity value, the first input capacity value, the second input capacity value and the third input capacity value of the extra-high voltage direct current receiving end alternating current filter, Qswap,1，Qswap,2And Qswap,3The first reactive exchange, the second reactive exchange and the third reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
The first input capacity value 2400Mvar, the first reactive exchange-125.8 Mvar and the second input capacity value Qfilt, 22274Mvar, second reactive exchange Qswap,2Is 17.5Mvar, and a third input capacity value Qfilt,22289Mvar and third reactive exchange Qswap,2And substituting 0.4Mvar into the calculation formula of the optimal input capacity value to obtain the optimal input capacity value of 2288.6 Mvar.
Fig. 2 is a schematic structural diagram of a system for calculating the input capacity of an extra-high voltage dc receiving end ac filter according to a preferred embodiment of the present invention. As shown in fig. 2, a system 200 for calculating the input capacity of an extra-high voltage dc-receiving ac filter according to the preferred embodiment includes:
and the data acquisition unit 201 is used for acquiring an active power value injected into an alternating current power grid by the extra-high voltage direct current receiving end converter station.
And the first capacity unit 202 is used for calculating a first input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the active power value and a preset input coefficient.
And a first reactive unit 203, configured to perform load flow calculation using a load flow program according to the active power value and the first input capacity value, and obtain a first reactive exchange between the extra-high voltage dc receiving end converter station and the ac power grid after being input into the ac filter according to the first input capacity value.
And a second capacity unit 204, configured to calculate a second input capacity value of the extra-high voltage dc receiving ac filter according to the first input capacity value and the first reactive exchange.
And a second reactive power unit 205, configured to perform load flow calculation using a load flow program according to the active power value and the second input capacity value, and obtain a second reactive power exchange between the extra-high voltage dc receiving end converter station and the ac power grid after being input into the ac filter according to the second input capacity value.
And a third capacity unit 206, configured to calculate a third input capacity value of the extra-high voltage dc receiving ac filter according to the first input capacity value, the second input capacity value, the first reactive power switching, and the second reactive power switching.
And a third reactive power unit 207, configured to perform load flow calculation using a load flow program according to the active power value and a third input capacity value, and obtain a third reactive power exchange between the extra-high voltage dc receiving end converter station and the ac power grid after being input into the ac filter according to the third input capacity value.
And an optimal capacity unit 208, configured to calculate an optimal input capacity value of the extra-high voltage dc receiving ac filter according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive power switching, the second reactive power switching, and the third reactive power switching.
Preferably, the first capacity unit 202 calculates a first input capacity value of the extra-high voltage dc receiving-end ac filter according to the active power value and a preset input coefficient, and a calculation formula thereof is:
Qfilt,1＝k*Pconv
in the formula, PconvIs the active power value Q of the extra-high voltage DC receiving end converter station injected into the AC power gridfilt,1Is the first input capacity value of the extra-high voltage DC receiving end AC filter, k is the preset input coefficient, 0<k<1。
Preferably, the second capacity unit 204 calculates a second input capacity value of the extra-high voltage dc receiving ac filter according to the first input capacity value and the first reactive exchange, and the calculation formula is:
Qfilt,2＝Qfilt,1+Qswap,1
in the formula, Qfilt,1And Qfilt,2Respectively is the first input capacity value, Q of the extra-high voltage DC receiving end AC filterswap,1The first reactive exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid is realized.
Preferably, the third capacity unit 206 calculates a third input capacity value of the hvdc filter according to the first input capacity value, the second input capacity value, the first reactive power exchange and the second reactive power exchange, and the calculation formula is as follows:
Qfilt,3＝(Qswap,1*Qfilt,2-Qswap,2*Qfilt,1)/(Qswap,1-Qswap,2)
in the formula, Qfilt,1，Qfilt,2And Qfilt,3Respectively a first input capacity value, a second input capacity value and a third input capacity value Q of the extra-high voltage direct current receiving end alternating current filterswap,1And Qswap,2The first reactive exchange and the second reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
Preferably, the optimal capacity unit 208 calculates the optimal input capacity value of the extra-high voltage dc receiving ac filter according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive power exchange, the second reactive power exchange, and the third reactive power exchange, and the calculation formula is as follows:
Figure BDA0003115039680000101
in the formula, Qfilt，Qfilt,1，Qfilt,2And Qfilt,3Respectively the optimal input capacity value, the first input capacity value, the second input capacity value and the third input capacity value of the extra-high voltage direct current receiving end alternating current filter, Qswap,1，Qswap,2And Qswap,3The first reactive exchange, the second reactive exchange and the third reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
The step of calculating the input capacity of the extra-high voltage direct current receiving end alternating current filter by the system for calculating the input capacity of the extra-high voltage direct current receiving end alternating current filter through gradual iteration is the same as the step adopted by the method for calculating the input capacity of the extra-high voltage direct current receiving end alternating current filter, the achieved technical effect is the same, and the description is omitted.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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 (10)

1. A method for calculating the input capacity of an extra-high voltage direct current receiving end alternating current filter is characterized by comprising the following steps:
acquiring an active power value injected into an alternating current power grid by an extra-high voltage direct current receiving end converter station;
calculating a first input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the active power value and a preset input coefficient;
according to the active power value and the first input capacity value, performing load flow calculation by using a load flow program to obtain first passive exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into an alternating current filter according to the first input capacity value;
calculating a second input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value and the first reactive exchange;
according to the active power value and the second input capacity value, load flow calculation is carried out by using a load flow program, and second reactive power exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into the alternating current filter according to the second input capacity value is obtained;
calculating a third input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the first reactive power exchange and the second reactive power exchange;
according to the active power value and the third input capacity value, load flow calculation is carried out by using a load flow program, and third reactive power exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into the alternating current filter according to the third input capacity value is obtained;
and calculating the optimal input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive exchange, the second reactive exchange and the third reactive exchange.
2. The method according to claim 1, wherein the first input capacity value of the extra-high voltage direct current receiving end alternating current filter is calculated according to the active power value and a preset input coefficient, and the calculation formula is as follows:
Qfilt,1＝k*Pconv
in the formula, PconvIs the active power value Q of the extra-high voltage DC receiving end converter station injected into the AC power gridfilt,1Is the first input capacity value of the extra-high voltage DC receiving end AC filter, k is the preset input coefficient, 0<k<1。
3. The method according to claim 1, wherein the second input capacity value of the extra-high voltage dc receiving end ac filter is calculated according to the first input capacity value and the first reactive exchange, and the calculation formula is:
Qfilt,2＝Qfilt,1+Qswap,1
in the formula, Qfilt,1And Qfilt,2Respectively is the first input capacity value, Q of the extra-high voltage DC receiving end AC filterswap,1The first reactive exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid is realized.
4. The method according to claim 1, wherein the third throw capacity value of the extra-high voltage dc receiving ac filter is calculated according to the first throw capacity value, the second throw capacity value, the first reactive power exchange and the second reactive power exchange, and the calculation formula is as follows:
Qfilt,3＝(Qswap,1*Qfilt,2-Qswap,2*Qfilt,1)/(Qswap,1-Qswap,2)
in the formula, Qfilt,1，Qfilt,2And Qfilt,3Respectively a first input capacity value, a second input capacity value and a third input capacity value Q of the extra-high voltage direct current receiving end alternating current filterswap,1And Qswap,2The first reactive exchange and the second reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
5. The method according to claim 1, wherein the optimal input capacity value of the EHV DC-AC filter is calculated according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive exchange, the second reactive exchange and the third reactive exchange, and the calculation formula is as follows:
Figure FDA0003115039670000021
in the formula, Qfilt，Qfilt,1，Qfilt,2And Qfilt,3Respectively the optimal input capacity value, the first input capacity value, the second input capacity value and the third input capacity value of the extra-high voltage direct current receiving end alternating current filter, Qswap,1，Qswap,2And Qswap,3The first reactive exchange, the second reactive exchange and the third reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
6. A system for calculating the input capacity of an extra-high voltage direct current receiving end alternating current filter is characterized by comprising the following components:
the data acquisition unit is used for acquiring an active power value injected into an alternating current power grid by the extra-high voltage direct current receiving end converter station;
the first capacity unit is used for calculating a first input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the active power value and a preset input coefficient;
the first reactive unit is used for carrying out load flow calculation by using a load flow program according to the active power value and a first input capacity value to obtain first reactive exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into an alternating current filter according to the first input capacity value;
a second capacity unit, which is used for calculating a second input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value and the first reactive exchange;
the second reactive power unit is used for carrying out load flow calculation by using a load flow program according to the active power value and a second input capacity value to obtain second reactive power exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into the alternating current filter according to the second input capacity value;
a third capacity unit, which is used for calculating a third input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the first reactive exchange and the second reactive exchange;
the third reactive power unit is used for carrying out load flow calculation by using a load flow program according to the active power value and a third input capacity value to obtain third reactive power exchange between the extra-high voltage direct current receiving end converter station and an alternating current power grid after the extra-high voltage direct current receiving end converter station is input into an alternating current filter according to the third input capacity value;
and the optimal capacity unit is used for calculating the optimal input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive exchange, the second reactive exchange and the third reactive exchange.
7. The system according to claim 6, wherein the first capacity unit calculates a first input capacity value of the extra-high voltage direct current receiving end alternating current filter according to the active power value and a preset input coefficient, and the calculation formula is as follows:
Qfilt,1＝k*Pconv
in the formula, PconvIs the active power value Q of the extra-high voltage DC receiving end converter station injected into the AC power gridfilt,1Is the first input capacity value of the extra-high voltage DC receiving end AC filter, k is the preset input coefficient, 0<k<1。
8. The system according to claim 6, wherein the second capacity unit calculates a second input capacity value of the extra-high voltage dc receiving ac filter according to the first input capacity value and the first reactive exchange, and the calculation formula is:
Qfilt,2＝Qfilt,1+Qswap,1
in the formula, Qfilt,1And Qfilt,2Respectively is the first input capacity value, Q of the extra-high voltage DC receiving end AC filterswap,1The first reactive exchange between the extra-high voltage direct current receiving end converter station and the alternating current power grid is realized.
9. The system of claim 6, wherein the third capacity unit calculates a third throw-in capacity value of the EHV-DC receiving AC filter according to the first throw-in capacity value, the second throw-in capacity value, the first reactive power exchange and the second reactive power exchange, and the calculation formula is as follows:
Qfilt,3＝(Qswap,1*Qfilt,2-Qswap,2*Qfilt,1)/(Qswap,1-Qswap,2)
in the formula, Qfilt,1，Qfilt,2And Qfilt,3Respectively a first input capacity value, a second input capacity value and a third input capacity value Q of the extra-high voltage direct current receiving end alternating current filterswap,1And Qswap,2The first reactive exchange and the second reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
10. The system of claim 6, wherein the optimal capacity unit calculates the optimal input capacity value of the EHV DC receiving AC filter according to the first input capacity value, the second input capacity value, the third input capacity value, the first reactive exchange, the second reactive exchange and the third reactive exchange, and the calculation formula is as follows:
Figure FDA0003115039670000041
in the formula, Qfilt，Qfilt,1，Qfilt,2And Qfilt,3Respectively the optimal input capacity value, the first input capacity value, the second input capacity value and the third input capacity value of the extra-high voltage direct current receiving end alternating current filter, Qswap,1，Qswap,2And Qswap,3The first reactive exchange, the second reactive exchange and the third reactive exchange of the extra-high voltage direct current receiving end converter station and the alternating current power grid are respectively carried out.
CN202110670850.2A 2021-06-15 2021-06-15 Method and system for calculating input capacity of extra-high voltage direct current receiving end alternating current filter Pending CN113489071A (en)

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CN114123288A (en) * 2021-11-30 2022-03-01 国网河南省电力公司直流运检分公司 Method for determining optimal reactive power exchange capacity of converter station and alternating current power grid

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CN101895124A (en) * 2010-05-27 2010-11-24 中国电力科学研究院 Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems
CN111614098A (en) * 2020-04-16 2020-09-01 国网江苏省电力有限公司经济技术研究院 Method and system for determining input capacity of alternating current filter of hybrid cascade direct current converter station

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CN114123288A (en) * 2021-11-30 2022-03-01 国网河南省电力公司直流运检分公司 Method for determining optimal reactive power exchange capacity of converter station and alternating current power grid
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