CN111969617A - Power grid strength evaluation method and device of multi-direct-current feed-in system containing STATCOM - Google Patents

Power grid strength evaluation method and device of multi-direct-current feed-in system containing STATCOM Download PDF

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CN111969617A
CN111969617A CN202010647708.1A CN202010647708A CN111969617A CN 111969617 A CN111969617 A CN 111969617A CN 202010647708 A CN202010647708 A CN 202010647708A CN 111969617 A CN111969617 A CN 111969617A
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direct current
feed
statcom
circuit ratio
current system
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田宝烨
姚文峰
黄东启
洪潮
周保荣
郭知非
王彤
杨健
孙鹏伟
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CSG Electric Power Research Institute
China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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China Southern Power Grid Co Ltd
Research Institute of Southern Power 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • 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
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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Abstract

The invention discloses a power grid strength evaluation method of a multi-direct-current feed-in system comprising STATCOMs, wherein each direct-current system is set to be a control mode of constant direct current and a turn-off angle, and each STATCOM outputs power with respective rated power; respectively acquiring the operating parameters of each direct current system and the operating parameters of each STATCOM in the current operating state; synchronously adjusting the current instruction of each direct current system according to a preset current instruction adjustment step length, and acquiring the operating parameters of each direct current system and the operating parameters of each STATCOM again to calculate the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system; and evaluating the power grid strength of the alternating current system of each direct current system according to the ratio of the multi-feed-in effective short-circuit ratio of each direct current system to the critical effective short-circuit ratio. By implementing the embodiment of the invention, the receiving-end power grid strength of the multi-direct-current feed-in system containing the STATCOM can be accurately evaluated, and a reference basis is provided for planning and construction of the power system.

Description

Power grid strength evaluation method and device of multi-direct-current feed-in system containing STATCOM
Technical Field
The invention relates to the technical field of power systems, in particular to a method and a device for evaluating the power grid strength of a multi-direct-current feed-in system with a STATCOM.
Background
With the continuous development of the field of power transmission, high-voltage direct-current transmission has become one of the important modes of 'west-east transmission' in China by virtue of the advantages of high capacity, long distance, regional interconnection and the like. Because resources and productivity in China are unevenly distributed, multiple direct current drop points cannot be avoided by the same alternating current receiving end system. The direct current system depends on power grid phase change, an alternating current power grid with certain strength is needed for supporting the stable operation of the direct current system, and if the alternating current system is too weak, the alternating current and direct current system is easy to be unstable when the system fluctuates, so that the stable operation of the power system is influenced. Therefore, the accurate evaluation of the strength of the alternating current power grid has great significance for planning and operating the power system.
Static synchronous compensators (STATCOM) can provide dynamic reactive support, improve the power grid strength and thus improve the stable operation capability of the system, and are gradually applied to power grids in recent years. For a multi-direct-current feed-in system comprising a STATCOM, a student quantitatively evaluates the intensity of a receiving-end power grid after the STATCOM is fed in from the angle that the STATCOM dynamically and reactive power affects alternating-current bus voltage and further affects the index of the multi-feed-in effective short-circuit ratio. However, in the process of implementing the invention, the inventor finds that the prior art has at least the following problems: the method ignores the influence of STATCOM dynamic reactive power on the critical effective short-circuit ratio of the system, thereby causing inaccurate results and possibly misleading the planning and operation work of the power system. The prior art currently lacks a recognized index for how to quantitatively evaluate the receiving-end power grid strength of the multi-direct-current feed-in system.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for evaluating the power grid strength of a multi-direct-current feed-in system containing a STATCOM, which can accurately evaluate the receiving-end power grid strength of the multi-direct-current feed-in system containing the STATCOM and provide a reference basis for planning and constructing a power system.
In order to achieve the above object, an embodiment of the present invention provides a method for evaluating a power grid strength of a multiple dc feed-in system including a STATCOM, including:
setting each direct current system in the multi-direct current feed-in system to be a control mode of constant direct current and an off angle, wherein each STATCOM outputs power with respective rated power;
respectively acquiring the operating parameters of each direct current system and the operating parameters of each STATCOM in the current operating state of the multi-direct current feed-in system;
after the operating parameters of each direct current system and the operating parameters of each STATCOM are obtained, the current instruction of each direct current system is synchronously adjusted according to the preset current instruction adjusting step length; obtaining the operating parameters of each direct current system and the operating parameters of each STATCOM after the current instruction is adjusted;
calculating a multi-feed-in effective short circuit ratio and a critical effective short circuit ratio of each direct current system according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction adjustment;
and evaluating the power grid strength of the alternating current system of each direct current system according to the ratio of the multi-feed-in effective short-circuit ratio of each direct current system to the critical effective short-circuit ratio.
As an improvement of the above scheme, the calculating a multi-feed effective short-circuit ratio and a critical effective short-circuit ratio of each dc system according to the operating parameters of each dc system and the operating parameters of each STATCOM before and after the current instruction adjustment specifically includes:
calculating the equivalent impedance of the equivalent single feed-in system corresponding to each direct current system according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction adjustment;
and calculating the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system according to the operating parameters of each direct current system before the current instruction is adjusted and the corresponding equivalent impedance of the equivalent single feed-in system.
As an improvement of the above scheme, before the current command is adjusted, the operation parameters of the dc system include: AC bus voltage amplitude U of DC systemi0Ac bus voltage phase
Figure BDA0002573737980000021
Active power P injected by direct current systemi0Reactive power Q consumed by direct current systemi0(ii) a The operating parameters of the STATCOM include: alternating current bus voltage amplitude U of STATCOMj0Ac bus voltage phase
Figure BDA0002573737980000022
STATCOM injected reactive power Qj0；
After the current command is adjusted, the operation parameters of the direct current system comprise: AC bus voltage amplitude U of DC systemi1Ac bus voltage phase
Figure BDA0002573737980000031
Active power P injected by direct current systemi1Reactive power Q consumed by direct current systemi1(ii) a The operating parameters of the STATCOM include: alternating current bus voltage amplitude U of STATCOMj1Ac bus voltage phase
Figure BDA0002573737980000032
STATCOM injected reactive power Qj1；
Where 1,2, …, k denotes the number of each dc system, and i is 1,2, …, k; k is the number of the direct current systems; let k +1, k +2, …, n denote the number of each STATCOM; j ═ k +1, k +2, …, n; n is the sum of all dc systems and the number of all STATCOM.
As an improvement of the above scheme, the calculating an equivalent impedance of an equivalent single feed-in system corresponding to each dc system according to the operating parameters of each dc system and the operating parameters of each STATCOM before and after the current instruction adjustment specifically includes:
calculating the equivalent impedance of the equivalent single feed-in system corresponding to each direct current system according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction is adjusted by the following calculation formula:
Figure BDA0002573737980000033
Figure BDA0002573737980000034
Figure BDA0002573737980000035
wherein the content of the first and second substances,
Figure BDA0002573737980000036
the equivalent impedance of the equivalent single feed-in system corresponding to the ith direct current system; m is traversed from 1 to n, m ═ 1,2, …, k, k +1, k +2, …, n;
Figure BDA0002573737980000037
an element of the ith row and the ith column of the impedance matrix of the multi-DC feed-in systemA peptide;
Figure BDA0002573737980000038
the element of the ith row and the mth column of the impedance matrix of the multi-direct current feed-in system.
As an improvement of the above scheme, the calculating a multi-feed effective short-circuit ratio and a critical effective short-circuit ratio of each dc system according to the operating parameter of each dc system before the current instruction adjustment and the equivalent impedance of the corresponding equivalent single-feed system specifically includes:
according to the operating parameters of each direct current system before the current instruction is adjusted and the corresponding equivalent impedance of the equivalent single feed-in system, calculating the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system through the following calculation formulas:
Figure BDA0002573737980000041
Figure BDA0002573737980000042
wherein MEESCRiMCEESCR for multi-feed effective short-circuit ratio of ith DC systemiIs the critical effective short-circuit ratio of the ith dc system,
Figure BDA0002573737980000043
is the equivalent impedance of the equivalent single feed-in system corresponding to the ith direct current system, thetaeqiIs the equivalent impedance of the ith direct current system
Figure BDA0002573737980000044
A corresponding impedance angle; gamma rayiThe turn-off angle of the ith direct current system; mu.siIs the commutation angle of the ith direct current system.
As an improvement of the above scheme, the evaluating the power grid strength of the ac system of the multiple dc feed-in system according to the ratio of the multiple feed-in effective short-circuit ratio to the critical effective short-circuit ratio of each dc system specifically includes:
calculating the ratio of the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system to serve as the short-circuit ratio of the corresponding direct current system;
acquiring the power grid strength grade of the alternating current system according to a mapping relation between a preset power grid strength grade and a short-circuit ratio; the mapping relation between the power grid strength grade and the short-circuit ratio records the corresponding relation between different combination conditions of the short-circuit ratio ratios of all the direct-current systems and the power grid strength grade.
As an improvement of the scheme, the power grid strength grade comprises three grades of stronger alternating current power grid strength, weaker alternating current power grid strength and extremely weaker alternating current power grid strength.
As an improvement of the above scheme, the mapping relationship between the preset grid strength level and the short-circuit ratio specifically includes:
when the short-circuit ratio of all the direct current systems is more than or equal to 2, the alternating current systems are in a power grid strength grade with stronger power grid strength;
when the short-circuit ratio of any direct current system is larger than 1 and smaller than 2, the alternating current system is in a power grid strength grade with weaker power grid strength;
when the short-circuit ratio value of any direct current system is less than or equal to 1, the alternating current system is in a power grid strength level with extremely weak power grid strength.
The embodiment of the invention also provides a power grid strength evaluation device of a multi-direct-current feed-in system containing the STATCOM, which comprises:
the control mode setting module is used for setting each direct current system in the multi-direct current feed-in system into a control mode of constant direct current and turn-off angle, and each STATCOM outputs power with respective rated power;
the first operation parameter acquisition module is used for respectively acquiring the operation parameters of each direct current system and the operation parameters of each STATCOM in the current operation state of the multi-direct current feed-in system;
the second operation parameter acquisition module is used for adjusting the step length according to a preset current instruction after acquiring the operation parameters of each direct current system and the operation parameters of each STATCOM, and synchronously adjusting the current instruction of each direct current system; obtaining the operating parameters of each direct current system and the operating parameters of each STATCOM after the current instruction is adjusted;
the short circuit ratio calculation module is used for calculating a multi-feed-in effective short circuit ratio and a critical effective short circuit ratio of each direct current system according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction adjustment;
and the power grid strength evaluation module is used for evaluating the power grid strength of the alternating current system of the multi-direct-current feed-in system according to the ratio of the multi-feed-in effective short-circuit ratio of each direct current system to the critical effective short-circuit ratio.
The embodiment of the present invention further provides an apparatus for evaluating grid strength of a multiple dc-feed system including a STATCOM, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where when the processor executes the computer program, the method for evaluating grid strength of a multiple dc-feed system including a STATCOM is implemented as any one of the above.
Compared with the prior art, the method and the device for evaluating the power grid strength of the multi-direct-current feed-in system with the STATCOM are characterized in that each direct-current system is set to be a control mode of constant direct current and a turn-off angle, and each STATCOM outputs power with preset rated power; and then, under the rated operation state of the multi-direct-current feed-in system, recording the operation parameters of each direct-current system and each STATCOM before and after the current instruction changes by adjusting the direct-current instruction so as to calculate the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of the multi-direct-current feed-in system. And finally, evaluating the power grid strength of the alternating current system of the multi-direct current feed-in system containing the STATCOM according to the ratio of the multi-feed-in effective short-circuit ratio to the critical effective short-circuit ratio. The method can accurately calculate the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of the multi-direct-current feed-in system containing the STATCOM, and considers the influence of the STATCOM dynamic reactive power on the critical effective short-circuit ratio of the power transmission system on the basis of considering the multi-feed-in effective short-circuit ratio for evaluating the power grid strength of the alternating-current system, so that the alternating-current power grid strength of the system after the STATCOM is fed in can be more accurately evaluated, and a reference basis is provided for planning and construction of the multi-direct-current feed-in power transmission system.
Drawings
Fig. 1 is a schematic diagram of an equivalent model of a multiple dc feed-in system including a STATCOM according to an embodiment of the present invention;
fig. 2 is a schematic flowchart illustrating steps of a method for evaluating a grid strength of a multiple dc feed-in system including a STATCOM according to an embodiment of the present invention;
fig. 3 is a schematic flowchart illustrating steps of a method for evaluating grid strength of a preferred multiple dc feed-in system including a STATCOM according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power grid strength evaluation apparatus of a multiple dc feed-in system including a STATCOM according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of another power grid strength evaluation apparatus of a multiple dc feed-in system including a STATCOM according to a fourth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram of an equivalent model of a multiple dc feed-in system including a STATCOM according to an embodiment of the present invention. A plurality of direct current systems transmit power to the same load center from different energy bases, and a multi-feed-in direct current transmission scene appears. The multi-direct-current feed-in power transmission system with the STATCOM comprises an alternating-current system, a plurality of direct-current systems and a static synchronous compensator STATCOM. In the process of transmitting power by a direct current transmission system, an alternating current power grid with certain strength is required to be used as a support. By feeding the multiple STATCOMs into the power transmission system, dynamic reactive support can be provided, the strength of an alternating current power grid is improved, and the problem that the stable operation of the whole power system is influenced because the power transmission capacity of a direct current system is limited due to the fact that the alternating current system is too weak is avoided.
In the embodiment of the present invention, for convenience of explanation, each dc system in the STATCOM-containing multiple dc feed system is denoted by the number 1,2, …, k, where k is the number of the dc systems. Each STATCOM is denoted by the number k +1, k +2, …, n is the sum of all dc systems and the number of all STATCOMs, and n-k is the number of all STATCOMs. In the multiple dc feed system, the number k of dc systems and the number (n-k) of STATCOMs, and the relationship between the numbers are not specifically limited herein. The method has the advantages that the power grid strength of the alternating current system after the STATCOM is fed into the power transmission system is accurately evaluated, the working parameter setting of the power system can be guided, and a reference basis is provided for planning and construction of the power system.
Referring to fig. 2, a schematic step flow diagram of a method for evaluating a grid strength of a multiple dc feed-in system including a STATCOM according to an embodiment of the present invention is shown. In order to accurately and effectively evaluate the grid strength of the ac system of the multiple dc feed-in system including the STATCOM, an embodiment of the present invention provides a grid strength evaluation method of the multiple dc feed-in system including the STATCOM, which is performed through steps S1 to S5:
and S1, setting each direct current system in the multiple direct current feed-in systems to be in a constant direct current and off-angle control mode, and enabling each STATCOM to output power at respective rated power.
Specifically, the ac and dc systems of the multiple dc feed-in system are obtained, all the dc systems are made to work in a control mode of constant dc current and turn-off angle, the control modes of all STATCOM are adjusted to constant reactive power, and the output is given by their rated power. Because the STATCOM is under the control mode of the constant reactive power, the reactive power of the STATCOM injection system is a constant value. In the subsequent adjustment process of the operating parameters of the alternating current system and the direct current system, the value of the reactive power of the STATCOM injection system cannot be changed, so that the accuracy of calculating the power grid strength of the alternating current system after the STATCOM is fed in is guaranteed.
And S2, respectively acquiring the operation parameters of each direct current system and the operation parameters of each STATCOM in the current operation state of the multi-direct current feed-in system.
S3, after the operation parameters of each direct current system and the operation parameters of each STATCOM are obtained, the current instruction of each direct current system is synchronously adjusted according to the preset current instruction adjustment step length; and acquiring the operating parameters of each direct current system and the operating parameters of each STATCOM after the current instruction is adjusted.
Specifically, after the control modes of the multiple direct current feed-in systems are all set, the multiple direct current feed-in systems are put into operation, and the operation parameters of each direct current system and the operation parameters of each STATCOM in the current operation state are obtained. Then, aiming at the direct current systems, according to the self capacity of each direct current system, a preset current instruction adjusting step length is set, and the current instruction of each direct current system is synchronously increased or decreased. While each STATCOM still maintains its respective rated capacity output. And measuring the operation parameters of each direct current system and the operation parameters of each STATCOM after the direct current instruction is adjusted. And calculating the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system according to the acquired operating parameters of all direct current systems and all STATCOMs before and after the current instruction changes.
And S4, calculating the multi-feed effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system according to the operation parameters of each direct current system before and after the current instruction adjustment and the operation parameters of each STATCOM.
Specifically, step S4 is specifically executed by steps S41 and S42:
s41, calculating the equivalent impedance of the equivalent single feed-in system corresponding to each direct current system according to the operation parameters of each direct current system before and after the current instruction adjustment and the operation parameters of each STATCOM;
and S42, calculating the multi-feed effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system according to the operating parameters of each direct current system before the current instruction is adjusted and the equivalent impedance of the corresponding equivalent single-feed system.
And S5, evaluating the power grid strength of the alternating current system of the multi-direct current feed-in system according to the ratio of the multi-feed-in effective short-circuit ratio of each direct current system to the critical effective short-circuit ratio.
And after the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of the multi-direct-current feed-in system are obtained through calculation, evaluating the power grid strength of the alternating-current system after the STATCOM is fed in according to the ratio of the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio. Generally, the larger the ratio of the multi-feed effective short-circuit ratio to the critical effective short-circuit ratio, the stronger the grid strength of the ac system. According to the power grid strength condition of the alternating current system after the STATCOM is fed into the system, the working parameter setting of the power system is correspondingly guided, for example, under the condition that the alternating current power grid strength is weak, the stable operation of the system can be ensured by measures such as reducing the transmission power of the direct current system, and therefore a reference basis is provided for planning and building the power system.
In the embodiment of the invention, the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the direct current instruction changes are measured in the operation process of the multi-direct current feed-in system, and the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system are calculated and obtained for evaluating the power grid strength of the alternating current system.
Fig. 3 is a schematic flowchart of steps of a method for evaluating the grid strength of a preferred multiple dc feed-in system including a STATCOM according to a second embodiment of the present invention. In the embodiment of the present invention, each dc system in the multiple dc feed-in system is set to a control mode of constant dc current and off-angle, and each STATCOM outputs a rated power.
And acquiring the operating parameters of each direct current system and the operating parameters of each STATCOM under the current rated operating state. Specifically, the operating parameters of the dc system include: AC bus of DC systemVoltage amplitude Ui0Ac bus voltage phase
Figure BDA0002573737980000091
Active power P injected by direct current systemi0Reactive power Q consumed by direct current systemi0(ii) a The operating parameters of the STATCOM include: alternating current bus voltage amplitude U of STATCOMj0Ac bus voltage phase
Figure BDA0002573737980000092
STATCOM injected reactive power Qj0. At the same time, the turn-off angle gamma of each DC system is obtainediAnd a phase change angle mui。
And then, aiming at the direct current systems, according to the self capacity of each direct current system, the current commands of all the direct current systems are synchronously increased or decreased according to the current command adjustment step length, and each STATCOM still keeps the rated capacity output of each STATCOM. The current instruction adjustment step length is preset according to the actual operation condition of the multi-feed-in direct current system and experience knowledge of a person skilled in the art, for example, the current instruction adjustment step length may be set to 0.01, or may be other suitable values, which do not affect the beneficial effects obtained by the present invention.
After the direct current instruction is adjusted, obtaining an operating parameter of each direct current system and an operating parameter of each STATCOM, wherein the operating parameters of the direct current systems comprise: AC bus voltage amplitude U of DC systemi1Ac bus voltage phase
Figure BDA0002573737980000101
Active power P injected by direct current systemi1Reactive power Q consumed by direct current systemi1(ii) a The operating parameters of the STATCOM include: alternating current bus voltage amplitude U of STATCOMj1Ac bus voltage phase
Figure BDA0002573737980000102
STATCOM injected reactive power Qj1. Where i is 1,2, …, k, a number used to traverse each dc system; j ═ k+1, k +2, …, n, the number used to traverse each STATCOM.
Further, according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction is adjusted, the equivalent impedance of the equivalent single feed-in system corresponding to each direct current system is calculated through the following calculation formula:
Figure BDA0002573737980000103
Figure BDA0002573737980000104
Figure BDA0002573737980000105
wherein the content of the first and second substances,
Figure BDA0002573737980000106
the equivalent impedance of the equivalent single feed-in system corresponding to the ith direct current system; i is 1,2, …, k;
Figure BDA0002573737980000107
the element of the ith row and the ith column of the impedance matrix of the multi-direct current feed-in system;
Figure BDA0002573737980000108
the element of the ith row and the mth column of the impedance matrix of the multi-direct current feed-in system. m is traversed from 1 to n, i.e. m is 1,2, …, k, k +1, k +2, …, n. When m is less than or equal to k, the operation parameters of the DC system are indicated, and when m is less than or equal to k, the operation parameters of the DC system are indicated>k, the operating parameters of the STATCOM are referred to.
By adopting the technical means of the embodiment of the invention, the connection between each direct current system in the multi-direct current feed-in system and the influence of the STATCOM feed-in power transmission system can be effectively considered, so that more accurate equivalent impedance of the direct current system can be calculated, and the multi-feed-in effective short-circuit ratio of each direct current system can be conveniently and accurately calculated.
And finally, according to the operating parameters of each direct current system before the current instruction is adjusted and the corresponding equivalent impedance of the equivalent single feed-in system, calculating the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system by the following calculation formula:
Figure BDA0002573737980000111
Figure BDA0002573737980000112
wherein MEESCRiMCEESCR for multi-feed effective short-circuit ratio of ith DC systemiIs the critical effective short-circuit ratio of the ith dc system,
Figure BDA0002573737980000113
is the equivalent impedance of the equivalent single feed-in system corresponding to the ith direct current system, thetaeqiIs the equivalent impedance of the ith direct current system
Figure BDA0002573737980000114
A corresponding impedance angle; gamma rayiThe turn-off angle of the ith direct current system; mu.siIs the commutation angle of the ith direct current system.
Multiple feed-in effective short-circuit ratio MEESCR corresponding to ith direct current systemiAnd critical effective short circuit ratio MCEESCRiThen, calculating the ratio of the multi-feed effective short-circuit ratio and the critical effective short-circuit ratio of the direct current system i
Figure BDA0002573737980000115
And obtaining the short-circuit ratio of all the direct current systems as the short-circuit ratio of the corresponding direct current system i. Acquiring the power grid strength grade of the alternating current system according to a mapping relation between a preset power grid strength grade and a short-circuit ratio; wherein, the mapping relation of the power grid strength grade and the short-circuit ratio records the short circuit of all direct current systemsAnd the corresponding relation between different combination conditions of the road ratio and the power grid strength grade.
Preferably, in the mapping relationship between the grid strength level and the short-circuit ratio, the grid strength level includes three levels, namely stronger ac grid strength, weaker ac grid strength and very weaker ac grid strength. And determining the interval where the direct current system is located according to the short-circuit ratio of the direct current system obtained through calculation, and combining the short-circuit ratio of all the direct current systems to obtain the corresponding power grid strength grade, so that the power grid strength of the alternating current system after the STATCOM is fed in is evaluated.
Specifically, when the short-circuit ratio of all DC systems satisfies
Figure BDA0002573737980000121
When the power grid intensity is higher than the preset power grid intensity, the alternating current system is in a power grid intensity level with higher power grid intensity; when there is any one of the short-circuit ratio values of the DC system satisfying
Figure BDA0002573737980000122
When the alternating current system is in the power grid intensity level with weaker power grid intensity; when there is any one of the short-circuit ratio values of the DC system satisfying
Figure BDA0002573737980000123
And in time, the alternating current system is in a power grid strength level with extremely weak power grid strength.
In the embodiment of the invention, after the power grid strength grade of the alternating current system is determined, the working parameter setting of the multi-feed-in direct current system can be correspondingly adjusted according to the power grid strength grade, so that the safe and stable operation of the system is ensured. For example, when the ac system is at a level with a strong grid strength, the multi-feed dc system may stably operate according to current operating parameters and operating conditions, and the stability margin is large; when the alternating current system is in a grade with weak power grid strength, the multi-feed-in direct current system can stably operate, but certain risks exist; when the alternating current system is in a level with extremely weak power grid strength, the multi-feed-in direct current system cannot stably operate, and measures such as reducing direct current transmission power, increasing STATCOM power or reducing equivalent impedance of the alternating current system are required to ensure safe and stable operation of the multi-feed-in direct current system, so that the power grid strength of the alternating current system is improved.
The embodiment of the invention provides a power grid strength evaluation method of a multi-direct-current feed-in system comprising STATCOMs, which comprises the steps of firstly setting each direct-current system as a control mode of constant direct current and a turn-off angle, and enabling each STATCOM to output power at a preset rated power; and then, under the rated operation state of the multi-direct-current feed-in system, recording the operation parameters of each direct-current system and each STATCOM before and after the current instruction changes by adjusting the direct-current instruction so as to calculate the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of the multi-direct-current feed-in system. And finally, evaluating the power grid strength of the alternating current system of the multi-direct current feed-in system containing the STATCOM according to the ratio of the multi-feed-in effective short-circuit ratio to the critical effective short-circuit ratio. The method can accurately calculate the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of the multi-direct-current feed-in system containing the STATCOM, and considers the influence of the STATCOM dynamic reactive power on the critical effective short-circuit ratio of the power transmission system on the basis of considering the multi-feed-in effective short-circuit ratio for evaluating the power grid strength of the alternating-current system, so that the alternating-current power grid strength of the system after the STATCOM is fed in can be more accurately evaluated, and a reference basis is provided for planning and construction of the multi-direct-current feed-in power transmission system.
Fig. 4 is a schematic structural diagram of a power grid strength evaluation apparatus of a multiple dc feed-in system including a STATCOM according to a third embodiment of the present invention. The third embodiment of the present invention provides a power grid strength evaluation apparatus 30 for a multiple dc feed-in system including a STATCOM, including: the system comprises a control mode setting module 31, a first operation parameter acquisition module 32, a second operation parameter acquisition module 33, a short-circuit ratio calculation module 34 and a power grid strength evaluation module 35; wherein the content of the first and second substances,
the control mode setting module 31 is configured to set each dc system in the multiple dc feed-in systems as a control mode of a constant dc current and a turn-off angle, and each STATCOM outputs a respective rated power;
the first operating parameter obtaining module 32 is configured to obtain an operating parameter of each dc system and an operating parameter of each STATCOM in a current operating state of the multiple dc feed-in system;
the second operation parameter obtaining module 33 is configured to, after obtaining the operation parameters of each dc system and the operation parameters of each STATCOM, adjust the step length according to a preset current instruction, and synchronously adjust the current instruction of each dc system; obtaining the operating parameters of each direct current system and the operating parameters of each STATCOM after the current instruction is adjusted;
the short circuit ratio calculation module 34 is configured to calculate a multi-feed effective short circuit ratio and a critical effective short circuit ratio of each dc system according to the operating parameters of each dc system and the operating parameters of each STATCOM before and after the current instruction adjustment;
the grid strength evaluation module 35 is configured to evaluate the ac system grid strength of the multiple dc feed-in systems according to the ratio of the multiple feed-in effective short-circuit ratio of each dc system to the critical effective short-circuit ratio.
Preferably, the short-circuit ratio calculation module 34 specifically includes an equivalent impedance calculation unit 341 and a short-circuit ratio calculation unit 342, wherein,
the equivalent impedance calculating unit 341 is configured to calculate an equivalent impedance of the equivalent single feed-in system corresponding to each dc system according to the operating parameters of each dc system before and after the current instruction adjustment and the operating parameters of each STATCOM.
The short circuit ratio calculation unit 342 is configured to calculate a multi-feed effective short circuit ratio and a critical effective short circuit ratio of each dc system according to the operating parameter of each dc system before the current instruction is adjusted and the equivalent impedance of the corresponding equivalent single-feed system.
As a preferred embodiment, before the current command is adjusted, the operation parameters of the dc system include: AC bus voltage amplitude U of DC systemi0Ac bus voltage phase
Figure BDA0002573737980000141
Active power P injected by direct current systemi0Reactive power Q consumed by direct current systemi0(ii) a The operating parameters of the STATCOM include: alternating current bus voltage amplitude U of STATCOMj0Ac bus voltage phase
Figure BDA0002573737980000142
STATCOM injected reactive power Qj0；
After the current command is adjusted, the operation parameters of the direct current system comprise: AC bus voltage amplitude U of DC systemi1Ac bus voltage phase
Figure BDA0002573737980000143
Active power P injected by direct current systemi1Reactive power Q consumed by direct current systemi1(ii) a The operating parameters of the STATCOM include: alternating current bus voltage amplitude U of STATCOMj1Ac bus voltage phase
Figure BDA0002573737980000144
STATCOM injected reactive power Qj1。
Where 1,2, …, k denotes the number of each dc system, and i is 1,2, …, k; k is the number of the direct current systems; let k +1, k +2, …, n denote the number of each STATCOM; j ═ k +1, k +2, …, n; n is the sum of all dc systems and the number of all STATCOM.
The equivalent impedance calculating unit 341 is specifically configured to: calculating the equivalent impedance of the equivalent single feed-in system corresponding to each direct current system according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction is adjusted by the following calculation formula:
Figure BDA0002573737980000145
Figure BDA0002573737980000146
Figure BDA0002573737980000151
wherein the content of the first and second substances,
Figure BDA0002573737980000152
the equivalent impedance of the equivalent single feed-in system corresponding to the ith direct current system; m is traversed from 1 to n, m ═ 1,2, …, k, k +1, k +2, …, n;
Figure BDA0002573737980000153
the element of the ith row and the ith column of the impedance matrix of the multi-direct current feed-in system;
Figure BDA0002573737980000154
the element of the ith row and the mth column of the impedance matrix of the multi-direct current feed-in system.
The short-circuit ratio calculation unit 342 is specifically configured to: according to the operating parameters of each direct current system before the current instruction is adjusted and the corresponding equivalent impedance of the equivalent single feed-in system, calculating the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system through the following calculation formulas:
Figure BDA0002573737980000155
Figure BDA0002573737980000156
wherein MEESCRiMCEESCR for multi-feed effective short-circuit ratio of ith DC systemiIs the critical effective short-circuit ratio of the ith dc system,
Figure BDA0002573737980000157
is the equivalent impedance of the equivalent single feed-in system corresponding to the ith direct current system, thetaeqiIs the equivalent impedance of the ith direct current system
Figure BDA0002573737980000158
A corresponding impedance angle; gamma rayiThe turn-off angle of the ith direct current system; mu.siIs the commutation angle of the ith direct current system.
As a preferred embodiment, the grid strength evaluation module 35 is specifically configured to: calculating the ratio of the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system to serve as the short-circuit ratio of the corresponding direct current system; acquiring the power grid strength grade of the alternating current system according to a mapping relation between a preset power grid strength grade and a short-circuit ratio; the mapping relation between the power grid strength grade and the short-circuit ratio records the corresponding relation between different combination conditions of the short-circuit ratio ratios of all the direct-current systems and the power grid strength grade.
Specifically, the power grid strength grade comprises three grades of stronger alternating current power grid strength, weaker alternating current power grid strength and extremely weaker alternating current power grid strength. Then, the mapping relationship between the preset grid strength level and the short-circuit ratio specifically includes:
when the short-circuit ratio of all the direct current systems is more than or equal to 2, the alternating current systems are in a power grid strength grade with stronger power grid strength;
when the short-circuit ratio of any direct current system is larger than 1 and smaller than 2, the alternating current system is in a power grid strength grade with weaker power grid strength;
when the short-circuit ratio value of any direct current system is less than or equal to 1, the alternating current system is in a power grid strength level with extremely weak power grid strength.
It should be noted that, the power grid strength evaluation apparatus of the multiple dc feed-in system including the STATCOM according to the third embodiment of the present invention is configured to execute all the process steps of the power grid strength evaluation method of the multiple dc feed-in system including the STATCOM according to the first or second embodiment, and working principles and beneficial effects of the two are in one-to-one correspondence, and thus are not described again.
The embodiment of the invention provides a power grid strength evaluation device of a multi-direct-current feed-in system comprising STATCOMs, which comprises the following steps that firstly, each direct-current system is set to be a control mode of constant direct current and a turn-off angle, and each STATCOM outputs power with preset rated power; and then, under the rated operation state of the multi-direct-current feed-in system, recording the operation parameters of each direct-current system and each STATCOM before and after the current instruction changes by adjusting the direct-current instruction so as to calculate the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of the multi-direct-current feed-in system. And finally, evaluating the power grid strength of the alternating current system of the multi-direct current feed-in system containing the STATCOM according to the ratio of the multi-feed-in effective short-circuit ratio to the critical effective short-circuit ratio. The method can accurately calculate the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of the multi-direct-current feed-in system containing the STATCOM, and considers the influence of the STATCOM dynamic reactive power on the critical effective short-circuit ratio of the power transmission system on the basis of considering the multi-feed-in effective short-circuit ratio for evaluating the power grid strength of the alternating-current system, so that the alternating-current power grid strength of the system after the STATCOM is fed in can be more accurately evaluated, and a reference basis is provided for planning and construction of the multi-direct-current feed-in power transmission system.
Fig. 5 is a schematic structural diagram of a power grid strength evaluation apparatus of another multiple dc feed-in system including a STATCOM according to a fourth embodiment of the present invention. The grid strength evaluation apparatus 40 of the multiple dc feed-in system including the STATCOM according to the fourth embodiment of the present invention includes a processor 41, a memory 42, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the grid strength evaluation method of the multiple dc feed-in system including the STATCOM according to the first embodiment or the second embodiment is implemented.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A method for evaluating the power grid strength of a multi-direct current feed-in system comprising a STATCOM is characterized by comprising the following steps:
setting each direct current system in the multi-direct current feed-in system to be a control mode of constant direct current and an off angle, wherein each STATCOM outputs power with respective rated power;
respectively acquiring the operating parameters of each direct current system and the operating parameters of each STATCOM in the current operating state of the multi-direct current feed-in system;
after the operating parameters of each direct current system and the operating parameters of each STATCOM are obtained, the current instruction of each direct current system is synchronously adjusted according to the preset current instruction adjusting step length; obtaining the operating parameters of each direct current system and the operating parameters of each STATCOM after the current instruction is adjusted;
calculating a multi-feed-in effective short circuit ratio and a critical effective short circuit ratio of each direct current system according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction adjustment;
and evaluating the power grid strength of the alternating current system of each direct current system according to the ratio of the multi-feed-in effective short-circuit ratio of each direct current system to the critical effective short-circuit ratio.
2. The method according to claim 1, wherein the calculating the multi-feed effective short-circuit ratio and the critical effective short-circuit ratio of each dc system according to the operating parameters of each dc system and the operating parameters of each STATCOM before and after the current command adjustment comprises:
calculating the equivalent impedance of the equivalent single feed-in system corresponding to each direct current system according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction adjustment;
and calculating the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system according to the operating parameters of each direct current system before the current instruction is adjusted and the corresponding equivalent impedance of the equivalent single feed-in system.
3. The method according to claim 2, wherein the operating parameters of the dc system before the current command is adjusted comprise: AC bus voltage amplitude U of DC systemi0Ac bus voltage phase
Figure FDA0002573737970000021
Active power P injected by direct current systemi0Reactive power Q consumed by direct current systemi0(ii) a The operating parameters of the STATCOM include: alternating current bus voltage amplitude U of STATCOMj0Ac bus voltage phase
Figure FDA0002573737970000022
STATCOM injected reactive power Qj0；
After the current command is adjusted, the operation parameters of the direct current system comprise: AC bus voltage amplitude U of DC systemi1Ac bus voltage phase
Figure FDA0002573737970000023
Active power P injected by direct current systemi1Reactive power Q consumed by direct current systemi1(ii) a The operating parameters of the STATCOM include: alternating current bus voltage amplitude U of STATCOMj1Ac bus voltage phase
Figure FDA0002573737970000024
STATCOM injected reactive power Qj1；
Where 1,2, …, k denotes the number of each dc system, and i is 1,2, …, k; k is the number of the direct current systems; let k +1, k +2, …, n denote the number of each STATCOM; j ═ k +1, k +2, …, n; n is the sum of all dc systems and the number of all STATCOM.
4. The method according to claim 3, wherein the calculating the equivalent impedance of the equivalent single-feed system corresponding to each dc system according to the operating parameters of each dc system and the operating parameters of each STATCOM before and after the current command adjustment comprises:
calculating the equivalent impedance of the equivalent single feed-in system corresponding to each direct current system according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction is adjusted by the following calculation formula:
Figure FDA0002573737970000025
Figure FDA0002573737970000026
Figure FDA0002573737970000031
wherein the content of the first and second substances,
Figure FDA0002573737970000032
the equivalent impedance of the equivalent single feed-in system corresponding to the ith direct current system; m is traversed from 1 to n, m ═ 1,2, …, k, k +1, k +2, …, n;
Figure FDA0002573737970000033
the element of the ith row and the ith column of the impedance matrix of the multi-direct current feed-in system;
Figure FDA0002573737970000034
the element of the ith row and the mth column of the impedance matrix of the multi-direct current feed-in system.
5. The method according to claim 3, wherein the calculating the effective short-circuit ratio and the critical effective short-circuit ratio of the multi-feed-in system according to the operating parameters of each dc system before the adjustment according to the current command and the equivalent impedance of the equivalent single-feed-in system comprises:
according to the operating parameters of each direct current system before the current instruction is adjusted and the corresponding equivalent impedance of the equivalent single feed-in system, calculating the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system through the following calculation formulas:
Figure FDA0002573737970000035
Figure FDA0002573737970000036
wherein MEESCRiMCEESCR for multi-feed effective short-circuit ratio of ith DC systemiIs the critical effective short-circuit ratio of the ith dc system,
Figure FDA0002573737970000037
is the equivalent impedance of the equivalent single feed-in system corresponding to the ith direct current system, thetaeqiIs the equivalent impedance of the ith direct current system
Figure FDA0002573737970000038
A corresponding impedance angle; gamma rayiThe turn-off angle of the ith direct current system; mu.siIs the commutation angle of the ith direct current system.
6. The method according to any of claims 1 to 5, wherein the evaluating the grid strength of the AC system of the multiple DC feed-in system according to the ratio of the multiple feed-in effective short-circuit ratio to the critical effective short-circuit ratio of each DC system comprises:
calculating the ratio of the multi-feed-in effective short-circuit ratio and the critical effective short-circuit ratio of each direct current system to serve as the short-circuit ratio of the corresponding direct current system;
acquiring the power grid strength grade of the alternating current system according to a mapping relation between a preset power grid strength grade and a short-circuit ratio; the mapping relation between the power grid strength grade and the short-circuit ratio records the corresponding relation between different combination conditions of the short-circuit ratio ratios of all the direct-current systems and the power grid strength grade.
7. The method according to claim 6, wherein the grid strength levels comprise three levels, namely stronger AC grid strength, weaker AC grid strength and weaker AC grid strength.
8. The method according to claim 7, wherein the mapping relationship between the preset grid intensity level and the short-circuit ratio specifically comprises:
when the short-circuit ratio of all the direct current systems is more than or equal to 2, the alternating current systems are in a power grid strength grade with stronger power grid strength;
when the short-circuit ratio of any direct current system is larger than 1 and smaller than 2, the alternating current system is in a power grid strength grade with weaker power grid strength;
when the short-circuit ratio value of any direct current system is less than or equal to 1, the alternating current system is in a power grid strength level with extremely weak power grid strength.
9. An apparatus for evaluating grid strength of a multiple dc feed-in system including a STATCOM, comprising:
the control mode setting module is used for setting each direct current system in the multi-direct current feed-in system into a control mode of constant direct current and turn-off angle, and each STATCOM outputs power with respective rated power;
the first operation parameter acquisition module is used for respectively acquiring the operation parameters of each direct current system and the operation parameters of each STATCOM in the current operation state of the multi-direct current feed-in system;
the second operation parameter acquisition module is used for adjusting the step length according to a preset current instruction after acquiring the operation parameters of each direct current system and the operation parameters of each STATCOM, and synchronously adjusting the current instruction of each direct current system; obtaining the operating parameters of each direct current system and the operating parameters of each STATCOM after the current instruction is adjusted;
the short circuit ratio calculation module is used for calculating a multi-feed-in effective short circuit ratio and a critical effective short circuit ratio of each direct current system according to the operation parameters of each direct current system and the operation parameters of each STATCOM before and after the current instruction adjustment;
and the power grid strength evaluation module is used for evaluating the power grid strength of the alternating current system of the multi-direct-current feed-in system according to the ratio of the multi-feed-in effective short-circuit ratio of each direct current system to the critical effective short-circuit ratio.
10. An apparatus for evaluating grid strength of a multiple dc-feed system including a STATCOM, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the method for evaluating grid strength of a multiple dc-feed system including a STATCOM according to any one of claims 1 to 8.
CN202010647708.1A 2020-07-07 2020-07-07 Power grid strength evaluation method and device of multi-direct-current feed-in system containing STATCOM Pending CN111969617A (en)

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