CN111614098B - Method and system for determining input capacity of alternating current filter of hybrid cascade direct current converter station - Google Patents
Method and system for determining input capacity of alternating current filter of hybrid cascade direct current converter station 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- 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
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- 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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Abstract
The technical scheme of the invention provides a method and a system for determining the input capacity of an alternating current filter of a hybrid cascade direct current converter station. The method and the system adopt a step-by-step iteration method, an input capacity initial value of the alternating current filter is determined according to an acquired active power value flowing into an alternating current power grid by the mixed cascade direct current converter station, then reactive power exchange between the mixed cascade direct current converter station and the alternating current power grid is determined after the alternating current filter is input according to the capacity according to the active power value and the input capacity initial value, and finally the input capacity value of the alternating current filter is determined after multiple iterations. The method has the advantage that the accurate configuration quantity of the alternating current filter in the hybrid cascade direct current converter station can be determined under the condition that an electromagnetic simulation tool is not used for carrying out fine modeling on the hybrid cascade direct current converter station.
Description
Technical Field
The invention relates to the technical field of ultra-high voltage transmission, in particular to a method and a system for determining the input capacity of an alternating current filter of a hybrid cascade direct current converter station.
Background
In simulation analysis and operation control of an extra-high voltage alternating current-direct current hybrid power grid, the filter configuration quantity in a hybrid cascade direct current converter station is highly dependent. However, in the current planning design and engineering operation process, the filter parameters in the hybrid cascaded dc converter station are usually obtained at the end of the feasibility study 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.
Disclosure of Invention
In order to solve the technical problem that the filter parameters in the hybrid cascade direct current converter station in the prior art are configured with larger deviation according to the existing empirical formula, the invention provides a method for determining the input capacity of an alternating current filter of the hybrid cascade direct current converter station, which comprises the following steps:
active power value P of mixed cascade direct current convertor station flowing into alternating current power grid is collected conv ；
According to the active power value P conv Determining an initial value Q of a first input capacity of an AC filter filt,1 ；
According to the active power value P conv And a first input capacity initial value Q filt,1 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a first input capacity filt,1 After the AC filter is put into the hybrid cascade DC converter station, the first reactive exchange Q between the hybrid cascade DC converter station and the AC power grid swap,1 ；
According to the initial value Q of the first input capacity filt,1 And a first reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 ；
According to the active power value P conv And a second input capacity initial value Q filt,2 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a second input capacity filt,2 After the AC filter is put into the hybrid cascade DC converter station, the second reactive exchange Q of the hybrid cascade DC converter station and the AC power grid swap,2 ；
According to the initial value Q of the first input capacity filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the third input capacity initial value Q of the AC filter filt,3 ；
According to the active power value P conv And a third input capacity initial value Q filt,3 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a third input capacity filt,3 After the AC filter is put into the hybrid cascade DC convertor station and the third reactive power exchange Q of the AC power grid swap,3 ；
According to the first input capacity initial value Q filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt 。
Further, according to the active power value P conv Determining initial value Q of input capacity of hybrid cascade DC-AC filter filt,1 The calculation formula is as follows:
Q filt,1 ＝k P c o nv
in the formula, k is a preset coefficient.
Further, the method is based on the initial value Q of the first input capacity filt,1 And reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 The calculation formula is as follows:
Q filt,2 ＝Q filt,1 +Q swap,1 。
further, the method is based on the first input capacity initial value Q filt,1 First exchange of power Q swap,1 The second inputInitial value of capacity Q filt,2 And a second reactive exchange Q swap,2 Determining the initial value Q of the third input capacity of the AC filter filt,3 The calculation formula is as follows:
further, the method is based on the initial value Q of the first input capacity filt,1 First exchange of power Q swap,1 And a second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt The calculation formula is as follows:
further, the power flow program adopted by the method is a PSD-BPA power flow program.
According to another aspect of the invention, the invention provides a system for determining the input capacity of an ac filter of a hybrid cascaded dc converter station, the system comprising:
a data acquisition unit for acquiring the active power value P of the mixed cascade DC convertor station flowing into the AC power grid conv ；
A first input capacity unit for determining the real power value P conv Determining an initial value Q of a first input capacity of an AC filter filt,1 ；
A first passive switching unit for switching the active power value P according to conv And a first input capacity initial value Q filt,1 Performing load flow calculation by using a load flow program, and determining the initial value Q according to the first input capacity filt,1 After the AC filter is put into the hybrid cascade DC converter station, the first reactive exchange Q between the hybrid cascade DC converter station and the AC power grid swap,1 ；
A second input capacity unit for inputting the capacity according to the first input capacityInitial value Q filt,1 And a first reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 ；
A second reactive power exchange unit for exchanging the active power value P according to conv And a second input capacity initial value Q filt,2 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a second input capacity filt,2 After the AC filter is put into the hybrid cascade DC converter station, the second reactive exchange Q of the hybrid cascade DC converter station and the AC power grid swap,2 ；
A third throw-in capacity unit for taking the first throw-in capacity initial value Q as a basis filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the initial value Q of the third input capacity of the AC filter filt,3 ；
A third reactive power exchange unit for exchanging the active power value P according to conv And a third input capacity initial value Q filt,3 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a third input capacity filt,3 After the AC filter is put into the hybrid cascade DC converter station, the third reactive exchange Q of the hybrid cascade DC converter station and the AC power grid swap,3 ；
A throw-in capacity determination unit for determining a throw-in capacity based on the first throw-in capacity initial value Q filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt 。
Further, the first input capacity unit is based on the active power value P conv Determining initial value Q of input capacity of hybrid cascade DC-AC filter filt,1 The calculation formula is as follows:
Q filt,1 ＝k P conv
in the formula, k is a coefficient set in advance.
Further, the second drop-in capacity unit rootAccording to the first input capacity initial value Q filt,1 And reactive exchange Q swap,1 Determining the second input capacity initial value Q of the AC filter filt,2 The calculation formula is as follows:
Q filt,2 ＝Q filt,1 +Q swap,1 。
further, the third throw-in capacity unit is based on the first throw-in capacity initial value Q filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the third input capacity initial value Q of the AC filter filt,3 The calculation formula is as follows:
further, the put-in-capacity determination unit determines the first put-in-capacity initial value Q based on the first put-in-capacity initial value filt,1 First exchange of power Q swap,1 And a second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt The calculation formula is as follows:
further, the power flow program adopted by the system is a PSD-BPA power flow program.
The method and the system for determining the input capacity of the alternating current filter of the hybrid cascade direct current converter station adopt a step-by-step iteration method, an input capacity initial value of the alternating current filter is determined according to an acquired active power value of the hybrid cascade direct current converter station flowing into an alternating current power grid, reactive power exchange between the hybrid cascade direct current converter station and the alternating current power grid is determined after the alternating current filter is input according to the capacity according to the active power value and the input capacity initial value, and finally the input capacity value of the alternating current filter is determined after multiple iterations. The method has the advantage that the accurate configuration quantity of the alternating current filter in the hybrid cascade direct current converter station can be determined under the condition that an electromagnetic simulation tool is not used for carrying out fine modeling on the hybrid cascade direct current converter station.
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 of determining the ac filter throw-in capacity of a hybrid cascaded dc converter station in accordance with a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of a system for determining the input capacity of an ac filter of a hybrid cascaded dc converter station in accordance with 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 flow chart of a method of determining the ac filter throw-in capacity of a hybrid cascaded dc converter station according to a preferred embodiment of the present invention.
The input capacity of the alternating current filter of the hybrid cascade direct current converter station is generally obtained at the end of the feasibility research stage in the current planning design and engineering operation process. And the configuration quantity of the filter is selected according to the existing empirical formula, the obtained simulation result has larger deviation from the actual operation, the load flow calculation is easy to be not converged, and the development of the stability research of the power system is seriously influenced. The following three types of factors are generally used to solve this problem:
(1) in actual operation, the voltage amplitude of the hybrid cascade direct current conversion bus is kept near the rated voltage;
(2) the principle of making reactive power exchange zero as much as possible is adhered to in the operation of the hybrid cascade direct current converter station, 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.
(3) By utilizing a linear or even higher-frequency interpolation means, the convergence of numerical iteration in the calculation process of the input quantity of the filter in the hybrid cascade direct current converter station can be accelerated.
The above advantageous factors provide technical feasibility for solving the calculation of the filter in the hybrid cascade direct current converter station. The invention adopts a step-by-step iteration method to determine the filter input capacity in the hybrid cascade direct current converter station.
As shown in fig. 1, the method 100 for determining the input capacity of the ac filter of the hybrid cascaded dc converter station according to the preferred embodiment starts with step 101.
In step 101, an active power value P flowing into an alternating current power grid of a hybrid cascade direct current converter station is collected conv 。
In step 102, according to the active power value P conv Determining an initial value Q of a first input capacity of an AC filter filt,1 。
Preferably, the active power value P is determined according to the active power value P conv Determining initial value Q of input capacity of hybrid cascade DC/AC filter filt,1 The calculation formula is as follows:
Q filt,1 ＝k P conv
in the formula, k is a coefficient set in advance.
In step 103, according to the active power value P conv And a first input capacity initial value Q filt,1 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a first input capacity filt,1 After the AC filter is put into the hybrid cascade DC converter station, the first reactive exchange Q between the hybrid cascade DC converter station and the AC power grid swap,1 。
In step 104, the initial value Q of the first input capacity is used filt,1 And a first reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 。
Preferably, the initial value Q is set according to the first input capacity filt,1 And reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 The calculation formula is as follows:
Q filt,2 ＝Q filt,1 +Q swap,1 。
in step 105, according to the active power value P conv And a second input capacity initial value Q filt,2 Performing load flow calculation by using a load flow program, and determining the initial value Q according to the second input capacity filt,2 After the AC filter is put into the hybrid cascade DC converter station, the second reactive exchange Q of the hybrid cascade DC converter station and the AC power grid swap,2 。
In step 106, the initial value Q of the first input capacity is used filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the initial value Q of the third input capacity of the AC filter filt,3 。
Preferably, said first throw-in capacity initial value Q is used as a basis filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the third input capacity initial value Q of the AC filter filt,3 The calculation formula is as follows:
in step 107, according to the active power value P conv And a third input capacity initial value Q filt,3 Performing load flow calculation by using a load flow program, and determining the third input capacityInitial value Q filt,3 After the AC filter is put into the hybrid cascade DC convertor station and the third reactive power exchange Q of the AC power grid swap,3 。
Preferably, the initial value Q is set according to the first input capacity filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 Third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt The calculation formula is as follows:
in step 108, the first input capacity initial value Q is used filt,1 First exchange of power Q swap,1 And a second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt 。
Preferably, the flow procedure adopted by the method is a PSD-BPA flow procedure.
Fig. 2 is a schematic diagram of the architecture of a system for determining the ac filter input capacity of a hybrid cascaded dc converter station according to a preferred embodiment of the present invention. As shown in fig. 2, the system 200 for determining the input capacity of the ac filter of the hybrid cascaded dc converter station according to the preferred embodiment includes:
a data collecting unit 201 for collecting the active power value P flowing into the AC power grid from the hybrid cascade DC converter station conv 。
A first input capacity unit 202 for determining the active power value P conv Determining an initial value Q of a first input capacity of an AC filter filt,1 。
A first passive switching unit 203 for switching the active power value P according to conv And a first input capacity initial value Q filt,1 Using tidal current programs to perform tidal current metersDetermining an initial value Q according to the first input capacity filt,1 After the AC filter is put into the hybrid cascade DC converter station, the first reactive exchange Q between the hybrid cascade DC converter station and the AC power grid swap,1 。
A second throw-in capacity unit 204 for throwing in the second throw-in capacity according to the first throw-in capacity initial value Q filt,1 And a first reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 。
A second reactive power exchange unit 205 for exchanging the active power value P according to conv And a second input capacity initial value Q filt,2 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a second input capacity filt,2 After the AC filter is put into the hybrid cascade DC converter station, the second reactive power exchange Q between the hybrid cascade DC converter station and the AC power grid swap,2 。
A third throw-in capacity unit 206 for taking into account the first throw-in capacity initial value Q filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the initial value Q of the third input capacity of the AC filter filt,3 。
A third reactive power exchange unit 207 for exchanging the active power value P according to conv And a third input capacity initial value Q filt,3 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a third input capacity filt,3 After the AC filter is put into the hybrid cascade DC converter station, the third reactive exchange Q of the hybrid cascade DC converter station and the AC power grid swap,3 。
A throw-in capacity determination unit 208 for determining a throw-in capacity based on the first throw-in capacity initial value Q filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt 。
Preferably, the first input capacity unit is based on the active power value P conv Determining the input capacitance of a hybrid cascaded DC-AC filterQuantity initial value Q filt,1 The calculation formula is as follows:
Q filt,1 ＝k P conv
in the formula, k is a coefficient set in advance.
Preferably, the second throw-in capacity unit is based on a first throw-in capacity initial value Q filt,1 And reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 The calculation formula is as follows:
Q filt,2 ＝Q filt,1 +Q swap,1 。
preferably, the third throw-in capacity unit is based on the first throw-in capacity initial value Q filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the initial value Q of the third input capacity of the AC filter filt,3 The calculation formula is as follows:
preferably, the input-capacity determining unit determines the first input-capacity initial value Q based on the first input-capacity initial value Q filt,1 First exchange of power Q swap,1 And a second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 Third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt The calculation formula is as follows:
preferably, the power flow program adopted by the system is a PSD-BPA power flow program.
The step of calculating the input capacity of the alternating current filter of the hybrid cascade direct current converter station by the system for determining the input capacity of the alternating current filter of the hybrid cascade direct current converter station is the same as the step adopted by the method for determining the input capacity of the alternating current filter of the hybrid cascade direct current converter station, the achieved technical effect is the same, and the description is omitted here.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the ones disclosed above are equally possible within the scope of these appended patent claims, as these are known to those skilled in the art.
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 [ means, component, etc ]" are to be interpreted openly as referring to at least one instance of said means, 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 (12)
1. A method of determining an ac filter throw-in capacity of a hybrid cascaded dc converter station, the method comprising:
active power value P of mixed cascade direct current convertor station flowing into alternating current power grid is collected conv ；
According to the active power value P conv Determining the initial value Q of the first input capacity of the AC filter filt,1 ；
According to the active power value P conv And a first input capacity initial value Q filt,1 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a first input capacity filt,1 After the AC filter is put into the hybrid cascade DC converter station, the first reactive exchange Q between the hybrid cascade DC converter station and the AC power grid swap,1 ；
According to the first input capacity initial value Q filt,1 And a first reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 ；
According to the active power value P conv And a second input capacity initial value Q filt,2 Performing load flow calculation by using a load flow program, and determining the initial value Q according to the second input capacity filt,2 After the AC filter is put into the hybrid cascade DC converter station, the second reactive power exchange Q between the hybrid cascade DC converter station and the AC power grid swap,2 ；
According to the initial value Q of the first input capacity filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the initial value Q of the third input capacity of the AC filter filt,3 ；
According to the active power value P conv And a third input capacity initial value Q filt,3 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a third input capacity filt,3 After the AC filter is put into the hybrid cascade DC converter station, the third reactive exchange Q of the hybrid cascade DC converter station and the AC power grid swap,3 ；
According to the initial value Q of the first input capacity filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt 。
2. Method according to claim 1, characterized in that the active power value P is based on conv Determining initial value Q of input capacity of hybrid cascade DC-AC filter filt,1 The calculation formula is as follows:
Q filt,1 ＝k P conv
in the formula, k is a coefficient set in advance.
3. Method according to claim 1, characterized in that said starting value Q is determined according to a first input capacity filt,1 And reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 The calculation formula is as follows:
Q filt,2 ＝Q filt,1 +Q swap,1 。
4. method according to claim 1, characterized in that said starting value Q is determined according to said first input capacity filt,1 First exchange of power Q swap,1 And a second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the third input capacity initial value Q of the AC filter filt,3 The calculation formula is as follows:
5. method according to claim 1, characterized in that said starting value Q is determined according to said first input capacity filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt The calculation formula is as follows:
6. the method of claim 1, wherein the flow program used in the method is a PSD-BPA flow program.
7. A system for determining the ac filter throw-in capacity of a hybrid cascaded dc converter station, the system comprising:
a data acquisition unit for acquiring the active power value P of the mixed cascade DC convertor station flowing into the AC power grid conv ；
A first input capacity unit for receiving the active power value P conv Determining an initial value Q of a first input capacity of an AC filter filt,1 ；
A first passive switching unit for switching the active power value P according to conv And a first input capacity initial value Q filt,1 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a first input capacity filt,1 After the AC filter is put into the hybrid cascade DC converter station, the first reactive exchange Q between the hybrid cascade DC converter station and the AC power grid swap,1 ；
A second throw-in capacity unit for taking the first throw-in capacity initial value Q as a basis filt,1 And the first power exchange Q swap,1 Determining the second input capacity initial value Q of the AC filter filt,2 ；
A second reactive power exchange unit for exchanging power according to the value of active power P conv And a second input capacity initial value Q filt,2 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a second input capacity filt,2 After the AC filter is put into the hybrid cascade DC converter station, the second reactive exchange Q of the hybrid cascade DC converter station and the AC power grid swap,2 ；
A third throw-in capacity unit for taking the first throw-in capacity initial value Q as a basis filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the initial value Q of the third input capacity of the AC filter filt,3 ；
A third reactive power exchange unit for exchanging the active power value P according to conv And a third input capacity initial value Q filt,3 Performing load flow calculation by using a load flow program, and determining an initial value Q according to a third input capacity filt,3 After being put into an AC filter, the hybrid cascade DC converter station andthird reactive exchange Q of AC network swap,3 ；
A throw-in capacity determination unit for determining a throw-in capacity based on the first throw-in capacity initial value Q filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt 。
8. The system of claim 7, wherein the first projected capacity unit is based on the active power value P conv Determining initial value Q of input capacity of hybrid cascade DC-AC filter filt,1 The calculation formula is as follows:
Q filt,1 ＝k P conv
in the formula, k is a preset coefficient.
9. The system of claim 7, wherein the second drop volume unit is responsive to a first drop volume initialization value Q filt,1 And reactive exchange Q swap,1 Determining the initial value Q of the second input capacity of the AC filter filt,2 The calculation formula is as follows:
Q filt,2 ＝Q filt,1 +Q swap,1 。
10. the system of claim 7, wherein the third drop volume unit is responsive to the first drop volume initialization value Q filt,1 First exchange of power Q swap,1 Second input capacity initial value Q filt,2 And a second reactive exchange Q swap,2 Determining the third input capacity initial value Q of the AC filter filt,3 The calculation formula is as follows:
11. the system according to claim 7, wherein the input capacity determination unit is configured to determine the first input capacity initial value Q filt,1 First exchange of power Q swap,1 And a second input capacity initial value Q filt,2 Second reactive exchange Q swap,2 And a third input capacity initial value Q filt,3 And a third reactive exchange Q swap,3 Determining AC filter input capacity Q filt The calculation formula is as follows:
12. the system of claim 7, wherein the power flow procedure employed by the system is a PSD-BPA power flow procedure.
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| CN110932287A (en) * | 2019-11-14 | 2020-03-27 | 国网新疆电力有限公司 | Power grid voltage control method for reducing near-zone voltage fluctuation of extra-high voltage direct current converter station |
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