CN106816881B - Series compensation device and capacity optimization method thereof - Google Patents
Series compensation device and capacity optimization method thereof Download PDFInfo
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- CN106816881B CN106816881B CN201710029597.6A CN201710029597A CN106816881B CN 106816881 B CN106816881 B CN 106816881B CN 201710029597 A CN201710029597 A CN 201710029597A CN 106816881 B CN106816881 B CN 106816881B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005457 optimization Methods 0.000 title claims abstract description 15
- 230000008878 coupling Effects 0.000 claims abstract description 52
- 238000010168 coupling process Methods 0.000 claims abstract description 52
- 238000005859 coupling reaction Methods 0.000 claims abstract description 52
- 230000009466 transformation Effects 0.000 claims abstract description 41
- 238000004804 winding Methods 0.000 claims abstract description 34
- 230000001939 inductive effect Effects 0.000 claims abstract description 17
- 230000001965 increasing effect Effects 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 15
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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Classifications
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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
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
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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
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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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
Abstract
The invention provides a series compensation device and a capacity optimization method thereof, wherein the device comprises a coupling transformer and a current converter; a primary side winding of the coupling transformer is connected in series into a line to be compensated, and a secondary side winding of the coupling transformer is connected in parallel with the current converter; the primary side winding and/or the secondary side winding are respectively provided with a plurality of taps for changing the voltage transformation ratio of the coupling transformer; the method comprises the steps of obtaining an equivalent impedance value when the series compensation device carries out inductive compensation; and adjusting the voltage transformation ratio of the coupling transformer according to the equivalent impedance value. Compared with the prior art, the series compensation device and the capacity optimization method thereof provided by the invention have the advantages that the capacity of the converter is always kept in a constant state by dynamically adjusting the voltage transformation ratio of the coupling transformer, the capacity of the converter is saved, and the manufacturing cost of the series compensation device is further reduced.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a series compensation device and a capacity optimization method thereof.
Background
The series compensation device is an important device for improving the transmission capacity of a power transmission system and improving the parameters of a power transmission line: in the long-distance power transmission line, the influence of inductance in the power transmission line can be counteracted through the series capacitor, so that the equivalent electrical distance is shortened, and the power transmission capacity and the voltage stability of the system are improved; in the heavy-load transmission line, the equivalent reactance of the transmission line can be increased through the series reactor, so that the tide is transferred to other transmission lines, and the problems of heavy load and overload of the transmission line are solved.
The method of line compensation through a series capacitor or a series reactor is called as fixed series compensation, and has the characteristics of simple control and good economical efficiency, but the compensation capacity of the method cannot be flexibly adjusted, and the mismatching of parameters can cause system oscillation. The conventional controllable series compensator mainly comprises a reactor, a capacitor and a half-controlled switching device, can realize the control of series capacitive reactance, but has the problems of high insulation requirement, low response speed and high manufacturing cost. At present, a Synchronous voltage source Controller formed by a full control device mainly includes a Unified Power Flow Controller (UPFC) and a Static Synchronous Series Compensator (SSSC).
The working principle of the unified power flow controller and the static synchronous series compensator is as follows:
due to the high line current rating when applied to a transmission system, the series side or SSSC device of the UPFC is typically connected into the system through a series transformer: the series side of the UPFC or the SSSC is equivalent to a synchronous ac power supply, and when the injected controllable voltage is opposite or the same as the voltage drop phase on the line reactance, it can play a role similar to a series capacitor or an inductor, specifically:
FIG. 1 is a schematic diagram of the relationship between compensation voltage and compensation current, as shown, when series side or SSSC of UPFC is inductively compensated, with injectionThe voltage amplitude increases, and the equivalent reactance of device increases, and circuit active power reduces thereupon: when the inductive compensation quantity of the converter is small, the injection voltage of the converter is the lowest value UminWhile the current through the inverter is at a maximum value Imax(ii) a When the inductive compensation quantity of the converter is large, the injection voltage of the converter is the maximum value UmaxWhile the current through the inverter is at a minimum value Imin. In summary, when the capacity of the converter is designed, the injection voltage of the converter and the current flowing through the converter need to be satisfied at the same time, that is, the maximum capacity of the converter needs to satisfy S ═ UmaxImaxAnd the cost is increased, which is not beneficial to the construction and the transformation of a large-scale power grid.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a series compensation device and a capacity optimization method thereof.
In a first aspect, the technical solution of the series compensation apparatus in the present invention is:
the apparatus comprises a coupling transformer and an inverter;
a primary side winding of the coupling transformer is connected into a line to be compensated in series, and a secondary side winding of the coupling transformer is connected with the current converter in parallel;
and a plurality of taps are arranged on the primary side winding and/or the secondary side winding and are used for changing the voltage transformation ratio of the coupling transformer.
Further preferred embodiments of the present invention are provided by:
the primary side winding and/or the secondary side winding are/is provided with an on-load tap-changer;
the on-load tap changer is used for adjusting the tap joint under the condition of no power failure so as to change the voltage transformation ratio of the coupling transformer.
Further preferred embodiments of the present invention are provided by:
the tap is specifically used for increasing the voltage transformation ratio when the equivalent impedance value of the series compensation device is increased during inductive compensation; when the equivalent resistance value decreases, the voltage transformation ratio is decreased.
Further preferred embodiments of the present invention are provided by:
the current converter is a voltage source current converter.
Further preferred embodiments of the present invention are provided by:
the apparatus further comprises: a disconnector, a device for measuring current and/or voltage, and/or a device for protecting the coupling transformer and/or the converter.
Further preferred embodiments of the present invention are provided by:
the device for protecting the coupling transformer and/or the converter is in particular a protection gap or a surge arrester.
In a second aspect, the technical solution of the capacity optimization method of the series compensation apparatus in the present invention is:
the apparatus comprises a coupling transformer and an inverter; a primary side winding of the coupling transformer is connected into a line to be compensated in series, and a secondary side winding of the coupling transformer is connected with the current converter in parallel; a plurality of taps are respectively arranged on the primary side winding and/or the secondary side winding;
the capacity optimization method comprises the following steps:
obtaining an equivalent impedance value when the series compensation device carries out inductive compensation on the line to be compensated;
and adjusting the voltage transformation ratio of the coupling transformer according to the equivalent impedance value.
Further preferred embodiments of the present invention are provided by:
the adjusting the voltage transformation ratio of the coupling transformer according to the equivalent impedance value comprises:
increasing the voltage transformation ratio when the equivalent impedance value increases;
when the equivalent resistance value decreases, the voltage transformation ratio is decreased.
Further preferred embodiments of the present invention are provided by:
the voltage transformation ratio k is shown in the following formula (1):
wherein, UNet sideAnd UValve sideThe voltage values of the primary side and the secondary side of the coupling transformer are respectively obtained.
Further preferred embodiments of the present invention are provided by:
the regulation principle of the voltage transformation ratio is shown as the following formula (2):
S1＝S2(2)
wherein S is1And S2The equivalent impedance values are respectively the converter capacities before and after the equivalent impedance value changes;
the capacity of the converter before the equivalent impedance value is transformed is shown as the following formula (3):
S1＝U1I1(3)
wherein, U1Terminal voltage, I, of said converter before change of equivalent impedance value1The current flowing through the converter before the equivalent impedance value is changed;
the capacity of the converter after the equivalent impedance value is changed is shown as the following formula (4):
S2＝U2I2(4)
wherein, U2Is the terminal voltage, I, of the converter after the change of the equivalent impedance value2The current is the current which flows through the inverter after the equivalent resistance value is changed.
Compared with the closest prior art, the invention has the beneficial effects that:
1. the series compensation device provided by the invention can be installed in a power transmission line or a distribution line, and the voltage transformation ratio of the coupling transformer can be changed to change the terminal voltage of the current converter through the tap after the inductive compensation impedance is changed, so that the capacity of the current converter is kept constant before and after the inductive compensation impedance output by the series compensation device is changed;
2. according to the capacity optimization method of the series compensation device, provided by the invention, through dynamically adjusting the voltage transformation ratio of the coupling transformer, the maximum value of the terminal voltage of the converter and the maximum value of the current flowing through the converter can be prevented from appearing at the same time, the capacity of the converter is kept in a constant state all the time, the capacity of the converter is saved, and the manufacturing cost of the series compensation device is further reduced.
Drawings
FIG. 1: the relation between the compensation voltage and the compensation current is shown schematically;
FIG. 2: a topology diagram of a series compensation apparatus in this embodiment;
FIG. 3: the relation schematic diagram of the voltage transformation ratio and the inductive compensation current of the coupling transformer in the embodiment of the invention;
wherein, 11: a first system; 12: a second system; 13: a transmission line; 21: a coupling transformer; 22: an inverter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
A series compensation apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 2 is a schematic diagram of a topology of a series compensation apparatus in this embodiment, as shown in the figure, the series compensation apparatus in this embodiment is installed between the first system 11 and the second system 12, and mainly includes a coupling transformer 21 and an inverter 22. Wherein the content of the first and second substances,
the primary winding of the coupling transformer 21 is connected in series to the line 13 to be compensated, and the secondary winding is connected in parallel to the inverter 22. And a plurality of taps are arranged on the primary side winding and/or the secondary side winding and are used for changing the voltage transformation ratio of the coupling transformer. The tap in this embodiment is specifically configured to increase the voltage transformation ratio when the equivalent impedance value of the series compensation device is increased during inductive compensation; when the equivalent resistance value decreases, the voltage transformation ratio is decreased. Meanwhile, the inverter 22 may employ a voltage source inverter.
In this embodiment, the series compensation device may be installed in a power transmission line or a distribution line, and after the inductive compensation impedance changes, the voltage transformation ratio of the coupling transformer may be changed by adjusting the tap, so as to change the terminal voltage of the inverter, so that the capacity of the inverter is kept constant before and after the inductive compensation impedance output by the series compensation device changes.
Further, the series compensation apparatus in this embodiment further includes the following structure.
In this embodiment, the series compensation apparatus further includes an on-load tap changer, which may be disposed on the primary winding or on the secondary winding, and is used to adjust a tap of the primary winding or a tap of the secondary winding to change a voltage transformation ratio of the coupling transformer.
In the embodiment, the on-load tap-changer is configured, so that the voltage transformation ratio of the coupling transformer can be changed under the condition of normal operation without power failure, the reliable operation of the series compensation device is ensured, and the stability of the system is improved.
Further, the series compensation device in this embodiment may further include the following structure.
When the series compensation device in this embodiment is applied to different transmission lines or distribution lines, corresponding disconnectors, devices for measuring current and/or voltage, and/or devices for protecting the coupling transformer and/or the converter may be added according to the actual line connection mode. The device for protecting the coupling transformer and/or the converter is in particular a protective gap or a lightning arrester.
The following describes a capacity optimization method for a series compensation apparatus according to an embodiment of the present invention with reference to the accompanying drawings.
The series compensation device in this embodiment includes a coupling transformer 21 and a converter 22, wherein a primary winding of the coupling transformer 21 is connected in series to a line to be compensated, and a secondary winding is connected in parallel to the converter 22. Meanwhile, the capacity optimization method in this embodiment is suitable for a series compensation device operating in an inductive compensation state, and may be specifically implemented according to the following steps.
1. And obtaining an equivalent impedance value when the series compensation device carries out inductive compensation.
2. And adjusting the voltage transformation ratio of the coupling transformer according to the equivalent impedance value.
The voltage transformation ratio in this example is shown in the following formula (1):
wherein, UNet sideAnd UValve sideFor respectively coupling the primary side voltage value and the secondary side voltage value of the transformer.
Fig. 3 is a schematic diagram of a relationship between a voltage transformation ratio of the coupling transformer and an inductive compensation current in the embodiment of the present invention, as shown in the drawing, the voltage transformation ratio of the coupling transformer and the inductive compensation current in the embodiment are in a negative correlation relationship, specifically: when the equivalent impedance value is increased, the voltage at two ends of the converter is increased, the voltage transformation ratio is adjusted to be increased, so that the terminal voltage of the converter is reduced, and the capacity of the converter before and after the equivalent impedance value is changed can be controlled to be kept constant; when the equivalent impedance value is reduced, the current flowing through the converter is increased, the voltage transformation ratio is adjusted to be reduced, the current flowing through the converter is reduced, and the capacity of the converter before and after the equivalent impedance value is changed can be controlled to be kept constant.
The regulation principle for regulating the voltage transformation ratio of the coupling transformer in this embodiment is shown in the following formula (2):
S1＝S2(2)
wherein S is1And S2The equivalent impedance values are the converter capacities before and after the equivalent impedance value changes.
The capacity of the converter before the equivalent impedance value changes is shown as the following formula (3):
S1＝U1I1(3)
wherein, U1Terminal voltage, I, of inverter before change of equivalent impedance value1Is the current through the inverter before the change in the equivalent resistance value.
The capacity of the converter after the equivalent impedance value is changed is shown as the following formula (4):
S2＝U2I2(4)
wherein, U2Is the terminal voltage of the inverter after the change of the equivalent impedance value, I2Is the current flowing through the inverter after the equivalent resistance value is changed.
In the embodiment, the voltage transformation ratio of the coupling transformer is dynamically adjusted, so that the maximum value of the terminal voltage of the converter and the maximum value of the current flowing through the converter can be prevented from occurring at the same time, the capacity of the converter is kept in a constant state all the time, the capacity of the converter is saved, and the manufacturing cost of the series compensation device is further reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A series compensation apparatus, characterized in that the apparatus comprises a coupling transformer and an inverter;
a primary side winding of the coupling transformer is connected into a line to be compensated in series, and a secondary side winding of the coupling transformer is connected with the current converter in parallel;
the primary side winding and/or the secondary side winding are/is provided with a plurality of taps for changing the voltage transformation ratio of the coupling transformer;
the primary side winding and/or the secondary side winding are/is provided with an on-load tap-changer;
the on-load tap changer is used for adjusting the tap joint under the condition of no power failure and changing the voltage transformation ratio of the coupling transformer;
the tap is specifically used for increasing the voltage transformation ratio when the equivalent impedance value of the series compensation device is increased during inductive compensation; when the equivalent resistance value decreases, the voltage transformation ratio is decreased.
2. A series compensation arrangement as claimed in claim 1,
the current converter is a voltage source current converter.
3. A series compensation arrangement as claimed in claim 1,
the apparatus further comprises: a disconnector, a device for measuring current and/or voltage, and/or a device for protecting the coupling transformer and/or the converter.
4. A series compensation arrangement as claimed in claim 3,
the device for protecting the coupling transformer and/or the converter is in particular a protection gap or a surge arrester.
5. A method of capacity optimization for a series compensation arrangement, the arrangement comprising a coupling transformer and an inverter; a primary side winding of the coupling transformer is connected into a line to be compensated in series, and a secondary side winding of the coupling transformer is connected with the current converter in parallel; a plurality of taps are respectively arranged on the primary side winding and/or the secondary side winding;
the capacity optimization method comprises the following steps:
obtaining an equivalent impedance value when the series compensation device carries out inductive compensation;
adjusting the voltage transformation ratio of the coupling transformer according to the equivalent impedance value;
the regulation principle of the voltage transformation ratio is shown as the following formula (2):
S1＝S2(2)
wherein S is1And S2The equivalent impedance values are respectively the converter capacities before and after the equivalent impedance value changes;
the capacity of the converter before the equivalent impedance value changes is shown as the following formula (3):
S1＝U1I1(3)
wherein, U1Terminal voltage, I, of said converter before change of equivalent impedance value1Electricity flowing through said inverter before change of equivalent impedance valueA stream;
the capacity of the converter after the equivalent impedance value is changed is shown as the following formula (4):
S2＝U2I2(4)
wherein, U2Is the terminal voltage, I, of the converter after the change of the equivalent impedance value2The current is the current which flows through the inverter after the equivalent resistance value is changed.
6. A capacity optimization method for a series compensation arrangement according to claim 5,
the adjusting the voltage transformation ratio of the coupling transformer according to the equivalent impedance value comprises:
increasing the voltage transformation ratio when the equivalent impedance value increases;
when the equivalent resistance value decreases, the voltage transformation ratio is decreased.
7. A capacity optimization method for a series compensation arrangement according to claim 6,
the voltage transformation ratio k is shown in the following formula (1):
wherein, UNet sideAnd UValve sideThe voltage values of the primary side and the secondary side of the coupling transformer are respectively obtained.
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| CN109932578B (en) * | 2017-12-15 | 2024-04-02 | 广州西门子能源变压器有限公司 | Method and device for carrying out temperature rise test on transformer to be tested |
| CN109378829A (en) * | 2018-11-28 | 2019-02-22 | 国家电网有限公司 | A kind of big load distribution line series connection compensation device parameter optimization method in end |
| CN113098295A (en) * | 2021-04-07 | 2021-07-09 | 全球能源互联网研究院有限公司 | AC-AC converter |
| CN114024317B (en) * | 2021-11-04 | 2023-06-23 | 全球能源互联网研究院有限公司 | Method and system for adjusting on-load tap-changer of flexible direct-current transformer |
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| US5610501A (en) * | 1995-02-01 | 1997-03-11 | Westinghouse Electric Corporation | Dynamic power and voltage regulator for an ac transmission line |
| CN201035433Y (en) * | 2007-02-06 | 2008-03-12 | 杭州钱江电气集团股份有限公司 | Energy bidirectional flowing voltage regulator |
| CN101656420B (en) * | 2009-09-09 | 2011-07-20 | 西安兴汇电力科技有限公司 | Reactive compensation type intelligent voltage regulator |
| CN202817775U (en) * | 2012-09-26 | 2013-03-20 | 河南新月实业有限公司 | Voltage regulating and capacitance regulating type integrated reactive power compensation device |
| CA2886409C (en) * | 2013-12-06 | 2016-03-22 | Rajiv Kumar Varma | Multivariable modulator controller for power generation facility |
| CN105515009A (en) * | 2015-12-02 | 2016-04-20 | 中国石油大学(华东) | Series-compensative bidirectional automatic voltage-regulating method for low-voltage power distribution line |
| CN205724898U (en) * | 2016-06-22 | 2016-11-23 | 全球能源互联网研究院 | Series hybrid SSSC |
| CN106130020B (en) * | 2016-08-16 | 2020-03-20 | 南京南瑞继保电气有限公司 | Series compensation device suitable for double-circuit line |
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| 基于Hilbert变换的串联电容补偿线路距离保护;张艳霞;《电力系统自动化》;20140410;第38卷(第7期);第77-82页 * |
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