CN113013910B - Application method of controllable high-resistance in direct-current power transmission system - Google Patents
Application method of controllable high-resistance in direct-current power transmission system Download PDFInfo
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- CN113013910B CN113013910B CN201911316450.0A CN201911316450A CN113013910B CN 113013910 B CN113013910 B CN 113013910B CN 201911316450 A CN201911316450 A CN 201911316450A CN 113013910 B CN113013910 B CN 113013910B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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]
Abstract
The invention provides an application method of controllable high reactance in a direct current transmission system, which aims at the large-capacity and frequent reactive exchange of a converter station and an alternating current system caused by the fluctuation of high-capacity direct current transmission power, configures the controllable high reactance at the rectifying/inverting side of the direct current converter station, determines the capacity and the control strategy of the controllable high reactance according to the actual running power fluctuation condition of the direct current transmission system, the configuration scheme of an alternating current filter of the converter station and the reactive power exchange limit value of the converter station and the alternating current system, meets the reactive power limit requirement of the converter station and the alternating current system, and avoids the frequent switching of the alternating current filter of the converter station. The reactive power control device and the reactive power control method thereof utilize the characteristics of high controllable reactance, frequent switching, flexibility, controllability and quick response, can pointedly solve reactive power fluctuation caused by direct current transmission, avoid equipment damage caused by frequent switching of a conventional reactive power control device, and have the advantages of high pointedness, strong practicability, high operability and the like.
Description
Technical Field
The invention relates to the field of alternating current and direct current transmission, in particular to an application method of a controllable high-resistance power transmission system.
Background
With the gradual establishment of large-capacity direct current transmission engineering in China, large-scale transfer between power supply and demand is a normal state, and with the vigorous development of new energy in China, the new energy duty ratio of a direct current transmission end is higher and higher, but due to the characteristics of randomness of new energy output, day-to-day variation and the like, many direct currents of the transmission end are gradually brought into a peak regulation range, for example, the direct current transmission is sent out in large power along with large photovoltaic in daytime, the direct current transmission is sent out in large power, the power organization capacity of a power grid of the transmission end is insufficient along with complete photovoltaic at night, and a direct current line is required to reduce transmission power to participate in the peak regulation of the power grid. As the dc power fluctuates widely over many times a day, there must also be a wide range of fluctuations in the reactive power exchange of the converter station with the ac system. In order to avoid great influence on voltage stability of an alternating current system, upper and lower exchange reactive limits of a converter station and the alternating current system are limited in a complete set design book of the direct current transmission project, and in order to avoid reactive exchange out-of-limit, alternating current filters capable of being switched in groups are configured in the converter station according to reactive requirements, and the filters are switched in groups according to exchange reactive conditions. Along with the direct current participated peak shaving, the alternating current filter can meet reactive power limiting requirements only by frequent switching, and the service life of the alternating current filter can be influenced by frequent switching of the alternating current filter, so that the alternating current filter is rapidly retired and replaced, and the stable operation and the overall economic benefit of direct current transmission are influenced. Aiming at the new problem generated by direct current transmission in the power grid development process, the invention combines the advantages of high controllable reactance, frequent switching, high response speed and the like, and provides a method for applying the high controllable reactance in direct current transmission.
Disclosure of Invention
The invention aims at: the method utilizes the self characteristic of the controllable high reactance to quickly respond to reactive power change of a converter station and an alternating current system, realizes quick support of reactive power, avoids grid stability risk caused by reactive power exchange out-of-limit of the converter station and the alternating current system, and reduces switching frequency of the alternating current filter.
In order to achieve the above object, the solution of the present invention is:
the application method of the controllable high reactance in the direct current transmission system aims at the large-capacity and frequent reactive exchange of the converter station and the alternating current system caused by the fluctuation of the large-capacity direct current transmission power, the controllable high reactance is configured on the rectifying/inverting side of the direct current converter station, and the capacity and the control strategy of the controllable high reactance are determined according to the actual running power fluctuation condition of the direct current transmission system, the configuration scheme of the alternating current filter of the converter station and the reactive power exchange limit value of the converter station and the alternating current system, so that the reactive power limit requirement of the converter station and the alternating current system is met, and the frequent switching of the alternating current filter of the converter station is avoided.
Further, the controllable high reactance is a hierarchical controllable high reactance.
Further, the method specifically comprises the following steps:
step 1, calculating a reactive power exchange value Q1 of a corresponding converter station and an alternating current system according to the daily power fluctuation condition of a direct current transmission system;
step 2, determining a total capacity Q3 for configuring controllable high reactance according to a reactive power exchange limit value Q2 of a converter station and an alternating current system required by a direct current complete set design, wherein: Q1-Q2 is more than or equal to Q3 and less than Q1;
step 3, determining the required group number N of the controllable high antibody according to the total capacity Q3 of the controllable high antibody and the monomer capacity Q4 of the controllable high antibody, wherein N is equal to or greater than Q3, and the difference value between N and Q3 is within a set range;
and step 4, determining the controllable high-impedance single-stage adjustment capacity according to the single-group capacity of the alternating-current filter, wherein the difference value between the N groups of controllable high-impedance single-stage maximum adjustment capacities and the single-group capacity of the alternating-current filter is within a set range.
The invention has the technical effects that: compared with the reactive exchange control scheme of an alternating current system, the reactive power control system of the invention utilizes the characteristics of high controllable reactance, frequent switching, flexibility, controllability, quick response and the like, and aims to solve reactive power fluctuation caused by direct current transmission, avoid equipment damage caused by frequent switching of a conventional reactive power control device, and has the advantages of high pertinence, strong practicability, high operability and the like.
Drawings
Fig. 1 is a schematic flow chart of an application method of the controllable high reactance in a direct current transmission system;
FIG. 2 DC power ripple curve;
fig. 3 reactive exchange curves of a converter station and an ac system;
fig. 4 is a graph of controllable high reactive output.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings.
The invention provides an application method of controllable high reactance in a direct current transmission system, which is characterized in that aiming at the high-capacity and frequent reactive exchange of a converter station and an alternating current system caused by high-capacity direct current transmission power fluctuation, the controllable high reactance is configured at the rectifying/inverting side of the direct current converter station, and the capacity and the control strategy of the controllable high reactance are determined according to the actual running power fluctuation condition of the direct current transmission system, the configuration scheme of an alternating current filter of the converter station and the reactive power exchange limit value of the converter station and the alternating current system, so that the reactive power limit requirement of the converter station and the alternating current system is met, and the frequent switching of the alternating current filter of the converter station is avoided. The controllable high resistance is preferably a hierarchical controllable high resistance.
Fig. 1 is a flowchart of an embodiment of a method for applying a controllable high reactance in a dc power transmission system according to the present invention, including the following steps:
s1, calculating a reactive power exchange value Q1 of the corresponding converter station and the corresponding alternating current system according to the daily power fluctuation condition of the direct current transmission system.
S2, determining the total capacity Q3 for configuring the controllable high reactance according to the reactive power exchange limit value Q2 of the converter station and the alternating current system required by the direct current complete set design, wherein: Q1-Q2 is less than or equal to Q3 and less than Q1.
S3, determining the required group number N of the controllable high antibody according to the total capacity Q3 of the controllable high antibody and the monomer capacity Q4 of the controllable high antibody, wherein N is equal to or larger than Q3, and the difference value between N and Q3 is in a set range.
S4, determining the controllable high-impedance single-stage adjustment capacity according to the single-group capacity of the alternating-current filter, wherein the difference value between the N groups of controllable high-impedance single-stage maximum adjustment capacities and the single-group capacity of the alternating-current filter is within a set range.
An application method embodiment II of the controllable high reactance in a DC power transmission system according to the present invention is described below with reference to FIGS. 2 to 4:
s1, calculating reactive power exchange values of the corresponding converter station and the alternating current system according to daily power fluctuation conditions of the direct current transmission system.
As shown in fig. 2, the reactive power exchange condition of the corresponding converter station and the ac system is determined by performing simulation analysis and calculation in combination with the daily power fluctuation condition for the active power output fluctuation curve of a certain dc transmission line in one day.
The simulation is carried out according to the working condition that the direct current power is increased from 200 kilowatts to 400 kilowatts, and if the switching of the alternating current filter is not considered, the reactive power with the capacity of over 1400Mvar is required to be absorbed from the alternating current side by the converter station according to the simulation result.
S2, determining the total capacity of the controllable high reactance according to reactive power exchange limit values of the converter station and the alternating current system required by the direct current complete set design.
According to the related requirements of the direct current complete set design, the reactive power exchanged between the converter station and the alternating current system cannot exceed 250Mar, and the controllable high reactance with the total capacity of about 1200Mvar can be considered to be configured.
S3, determining the required group number of the controllable high-resistance according to the total capacity of the controllable high-resistance and the monomer capacity of the controllable high-resistance.
According to the existing high reactance capacity, a controllable high reactance with the capacity of 3 x 420mvar can be considered to be configured.
S4, determining the controllable high-impedance single-stage adjustment capacity according to the single-group capacity of the alternating current filter, wherein the difference value between the maximum adjustment capacity of all controllable high-impedance single-stage and the single-group capacity of the alternating current filter is within a set range.
The controllable high reactance adopts a grading type, each group of controllable high reactance fixed capacity is 10% of rated capacity, and because the controllable high reactance groups are more, the total adjustment quantity of the controllable high reactance at one stage is not suitable to be too far different from the single group capacity of the alternating current filter (330 Mvar) in order to avoid over adjustment, therefore, the controllable high reactance variable capacity part is divided according to three stages, the adjustable capacity of each stage is 30% of the rated capacity, namely 126Mvar, and the controllable high reactance single-stage maximum adjustment capacity 378Mvar of 3 groups.
According to the configuration scheme, simulation analysis is carried out, the exchange reactive curves of the converter stations and the alternating current system after the controllable high-reactance access are considered, as shown in fig. 3, the reactive exchange value is controlled within the range of +/-250 Mvar, and switching of an alternating current filter is not needed any more to control reactive exchange.
The reactive output curves of the corresponding single set of controllable high reactance are shown in fig. 4.
Claims (2)
1. The application method of the controllable high-resistance in the direct-current transmission system is characterized by comprising the following steps of: aiming at the large-capacity and frequent reactive exchange of the converter station and the alternating current system caused by the fluctuation of the large-capacity direct current transmission power, a controllable high reactance is configured at the rectifying/inverting side of the direct current converter station, and the capacity and the control strategy of the controllable high reactance are determined according to the actual running power fluctuation condition of the direct current transmission system, the configuration scheme of the alternating current filter of the converter station and the reactive power exchange limit value of the converter station and the alternating current system, so that the reactive power limit requirement of the converter station and the alternating current system is met, and the frequent switching of the alternating current filter of the converter station is avoided;
the method specifically comprises the following steps:
step 1, calculating a reactive power exchange value Q1 of a corresponding converter station and an alternating current system according to the daily power fluctuation condition of a direct current transmission system;
step 2, determining a total capacity Q3 for configuring controllable high reactance according to a reactive power exchange limit value Q2 of a converter station and an alternating current system required by a direct current complete set design, wherein: Q1-Q2 is more than or equal to Q3 and less than Q1;
step 3, determining the required group number N of the controllable high antibody according to the total capacity Q3 of the controllable high antibody and the monomer capacity Q4 of the controllable high antibody, wherein N is equal to or greater than Q3, and the difference value between N and Q3 is within a set range;
and step 4, determining the controllable high-impedance single-stage adjustment capacity according to the single-group capacity of the alternating-current filter, wherein the difference value between the N groups of controllable high-impedance single-stage maximum adjustment capacities and the single-group capacity of the alternating-current filter is within a set range.
2. The method for applying the controllable high-resistance to the direct-current power transmission system according to claim 1, wherein the method comprises the following steps: the controllable high resistance is hierarchical controllable high resistance.
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Citations (3)
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|---|---|---|---|---|
| WO2014079278A1 (en) * | 2012-11-22 | 2014-05-30 | 国家电网公司 | Method for configuring reactive compensation device of large-scale wind power transmission system |
| CN103972898A (en) * | 2014-05-07 | 2014-08-06 | 南京南瑞继保电气有限公司 | Method for coordination control of controllable shunt reactors |
| CN106159957A (en) * | 2015-04-09 | 2016-11-23 | 中国电力科学研究院 | A kind of optimization method exchanging weak section steady-state overvoltage Pre-control measures |
-
2019
- 2019-12-19 CN CN201911316450.0A patent/CN113013910B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014079278A1 (en) * | 2012-11-22 | 2014-05-30 | 国家电网公司 | Method for configuring reactive compensation device of large-scale wind power transmission system |
| CN103972898A (en) * | 2014-05-07 | 2014-08-06 | 南京南瑞继保电气有限公司 | Method for coordination control of controllable shunt reactors |
| CN106159957A (en) * | 2015-04-09 | 2016-11-23 | 中国电力科学研究院 | A kind of optimization method exchanging weak section steady-state overvoltage Pre-control measures |
Non-Patent Citations (1)
| Title |
|---|
| ±800kV向上直流换流站交流滤波器的配置与控制;邓艳平;杨秀;张美霞;潘爱强;;高压电器(第02期);全文 * |
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