CN107591820B - SVG coordination compensation system and SVG coordination compensation method - Google Patents
SVG coordination compensation system and SVG coordination compensation method Download PDFInfo
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Abstract
The invention relates to an SVG coordination compensation system and method, wherein the system comprises a first current transformer, a second current transformer, a first transformer, a second transformer, a first SVG, a second SVG and a controller; the first transformer input end is electrically connected with an input power supply, the output end is electrically connected with a first SVG, the second transformer input end is electrically connected with the input power supply, the output end is electrically connected with the second SVG, and the controller is electrically connected with the first current transformer, the second current transformer, the first SVG and the second SVG respectively. According to the technical scheme provided by the invention, when one of the two transformer power supply lines of the power utilization enterprise substation has power supply faults, SVG on the two lines are coordinated to perform reactive compensation, so that the reactive compensation effect is improved, the resource waste is avoided, and the economic benefit is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an SVG coordination compensation system and method.
Background
SVG (Static Var Generator), i.e. static var compensator, is a device dedicated to reactive compensation by a self-commutated power semiconductor bridge converter. In large industrial and mining enterprises and energy companies such as petroleum and natural gas, 110KV transformer substations or 35KV transformer substations are generally arranged, most of the transformer substations are provided with high-power loads, two high-voltage wire inlet circuits are generally arranged as a main wire inlet circuit and a standby wire inlet circuit, and when one wire inlet circuit has power supply faults, the power load on the wire inlet circuit can still normally run. Each route is provided with an SVG which is respectively responsible for reactive compensation of the route, when one line incoming circuit fails, the other line incoming circuit supplies power to the load on the original circuit, but the SVG usually only performs reactive compensation on the transformer of the route. At this time, since one line incoming circuit needs to supply power to two loads, and the compensation of the SVG is only aimed at one line transformer, such compensation effect does not reach a predetermined effect, resulting in resource waste. In addition, for long-distance high-voltage lines, reactive power loss on the high-voltage lines, namely the line-in circuit of a transformer substation of an electricity utilization enterprise is huge, especially when in light load, the reactive power loss is more obvious, and the waste of resources is caused, and extra economic burden is caused for enterprises.
Disclosure of Invention
In order to coordinate SVG on two lines to perform reactive compensation when one of two transformer power supply lines of an electric enterprise substation has power supply faults, the invention provides a SVG coordination compensation system and a SVG coordination compensation method, which improve reactive compensation effect, avoid resource waste and improve economic benefit.
In one aspect, the invention provides an SVG coordination compensation system, which comprises a first current transformer, a second current transformer, a first transformer, a second transformer, a first SVG, a second SVG and a controller; the first transformer input end is electrically connected with an input power supply, the output end is electrically connected with a first SVG, the second transformer input end is electrically connected with the input power supply, the output end is electrically connected with a second SVG, and the controller is respectively electrically connected with the first current transformer, the second current transformer, the first SVG and the second SVG;
the first current transformer is arranged between the first transformer and the input power supply and is used for detecting whether current flows into the first transformer or not;
the second current transformer is arranged between the second transformer and the input power supply and is used for detecting whether current flows into the second transformer or not;
the controller is used for controlling the first SVG and the second SVG to jointly perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply when current flows into the first transformer and no current flows into the second transformer; when no current flows into the first transformer and no current flows into the second transformer, the first SVG and the second SVG are controlled to perform reactive compensation on the second transformer and a connecting line between the second transformer and an input power supply.
In another aspect, the present invention provides a method for SVG coordinated compensation, the method comprising the steps of:
s10: a first current transformer arranged between the first transformer and the input power supply detects whether current flows into the first transformer; the second current transformer is arranged between the second transformer and the input power supply and used for detecting whether current flows into the second transformer or not;
s20: when current flows into the first transformer and no current flows into the second transformer, the controller controls the first SVG and the second SVG to perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply together; when no current flows into the first transformer and current flows into the second transformer, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the second transformer and a connecting line between the second transformer and the input power supply.
The SVG coordination compensation system and the SVG coordination compensation method have the advantages that the first current transformer and the second current transformer are respectively arranged at the upstream of the transformers of the two power supply lines of the power utilization enterprise, the currents of the two power supply lines are detected, if one of the power supply lines, for example, the first transformer incoming line has a power supply fault, the first current transformer cannot detect the currents, meanwhile, the second transformer incoming line keeps normal, the second current transformer can detect the currents, and the second transformer incoming line supplies power to all loads mounted on the first transformer outgoing line and the second transformer outgoing line through the bus-bar line. When both incoming lines are running normally, the first SVG mounted on the outgoing line of the first transformer is responsible for reactive compensation of the line where the first transformer is located, and the second SVG mounted on the outgoing line of the second transformer is responsible for reactive compensation of the line where the second transformer is located. When the first transformer inlet wire breaks down, the load mounted on the first transformer outlet wire is supplied by the second transformer inlet wire, meanwhile, the first SVG and the second SVG perform reactive compensation on the second transformer inlet wire and the second transformer which provide power together, and if the second transformer inlet wire breaks down, the first SVG and the second SVG perform reactive compensation on the first transformer inlet wire and the first transformer which provide power together. The compensation output modules respectively arranged on the circuit and the transformer through the SVG not only compensate the charging reactive power on the power supply circuit, but also compensate the reactive power of the power supply circuit transformer, thereby improving the compensation effect and reducing the resource waste and the extra economic burden caused by under compensation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a block diagram of an SVG coordination compensation system according to an embodiment of the present invention;
fig. 2 is a flow chart of an SVG coordinated compensation method according to an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, an SVG coordinated compensation system provided by an embodiment of the present invention includes a first current transformer, a second current transformer, a first transformer, a second transformer, a first SVG, a second SVG, and a controller; the first transformer input end is electrically connected with an input power supply, the output end is electrically connected with a first SVG, the second transformer input end is electrically connected with the input power supply, the output end is electrically connected with a second SVG, and the controller is respectively electrically connected with the first current transformer, the second current transformer, the first SVG and the second SVG.
The first current transformer is arranged between the first transformer and the input power supply and is used for detecting whether current flows into the first transformer.
The second current transformer is arranged between the second transformer and the input power supply and is used for detecting whether current flows into the second transformer.
The transformer station of the power utilization enterprise is generally provided with two transformers which respectively provide two paths of output power sources for the electric equipment mounted on the outgoing line of the transformer, the transformer is connected into a power grid of a power supply company through a wire inlet circuit to serve as an input power source, and a wire inlet between a substation of the power supply company and a substation of the power utilization company is generally self-responsible by the power utilization company. It should be noted that the longer the incoming line length, the greater the reactive charge thereon. Two current transformers, namely a first current transformer and a second current transformer, are respectively arranged on the two incoming lines and used for detecting the mutual inductance current of the two incoming line circuits. The two transformers respectively convert the high-voltage power input of the power grid into the output of the enterprise low-voltage power supply for supplying power to the load. Reactive power is mainly generated in the incoming lines and transformers.
The controller is used for controlling the first SVG and the second SVG to jointly perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply when current flows into the first transformer and no current flows into the second transformer; when no current flows into the first transformer and no current flows into the second transformer, the first SVG and the second SVG are controlled to perform reactive compensation on the second transformer and a connecting line between the second transformer and an input power supply.
If one of the power supply lines, for example, the first transformer incoming line has a power supply fault, the first current transformer cannot detect current, meanwhile, the second transformer incoming line keeps normal, the second current transformer can detect current, and the second transformer incoming line supplies power to all loads mounted on the first transformer outgoing line and the second transformer outgoing line through the bus connection line. When both incoming lines are running normally, the first SVG mounted on the outgoing line of the first transformer is responsible for reactive compensation of the line where the first transformer is located, and the second SVG mounted on the outgoing line of the second transformer is responsible for reactive compensation of the line where the second transformer is located. When the first transformer inlet wire breaks down, the load mounted on the first transformer outlet wire is supplied by the second transformer inlet wire, meanwhile, the first SVG and the second SVG perform reactive compensation on the second transformer inlet wire and the second transformer which provide power together, and if the second transformer inlet wire breaks down, the first SVG and the second SVG perform reactive compensation on the first transformer inlet wire and the first transformer which provide power together. The compensation output modules respectively arranged on the circuit and the transformer through the SVG not only compensate the charging reactive power on the power supply circuit, but also compensate the reactive power of the power supply circuit transformer, thereby improving the compensation effect and reducing the resource waste and the extra economic burden caused by under compensation.
Preferably, the system further comprises a first bus-tie switch, a second bus-tie switch, a first displacement sensor and a second displacement sensor; the first transformer input end and the second transformer input end are electrically connected through a first bus-bar switch, the first transformer output end and the second transformer output end are electrically connected through a second bus-bar switch, the first displacement sensor is electrically connected with the first bus-bar switch, the second displacement sensor is electrically connected with the second bus-bar switch, and the controller is respectively electrically connected with the first displacement sensor and the second displacement sensor.
And the first displacement sensor is used for detecting whether the first bus-tie switch is closed or not.
And the second displacement sensor is used for detecting whether the second bus-tie switch is closed or not.
If the incoming line of the first transformer has a power failure, the first bus-tie switch or the second bus-tie switch is automatically closed, so that the load incoming line on the line where the first transformer is located is powered through the incoming line of the second transformer. The situation is similar when a power failure occurs in the line in which the second transformer is located. The displacement sensor can detect whether the bus connection switch is closed or not, so that whether the bus connection line is conducted or not is judged.
It should be noted that when a certain incoming line fails, only one of the first and second bus switches is closed.
The controller is specifically configured to:
when current flows into the first transformer and no current flows into the second transformer, the first bus-tie switch is closed, and the second bus-tie switch is not closed, the first SVG and the second SVG are controlled to perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply.
When current flows into the first transformer and no current flows into the second transformer, the first bus-tie switch is not closed, and the second bus-tie switch is closed, the first SVG and the second SVG are controlled to perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply.
When no current flows into the first transformer and current flows into the second transformer, the first bus-tie switch is closed, and the second bus-tie switch is not closed, the first SVG and the second SVG are controlled to perform reactive compensation on the second transformer and a connecting line between the second transformer and an input power supply.
When no current flows into the first transformer, current flows into the second transformer, the first bus-tie switch is not closed, and the second bus-tie switch is closed, the first SVG and the second SVG are controlled to perform reactive compensation on the second transformer and a connecting line between the second transformer and an input power supply.
Whether a power supply line fault occurs is determined according to the mutual inductance current detection conditions of the first current transformer and the second current transformer, a circuit where the power supply source is located is judged according to the closing conditions of the first bus-tie switch and the second bus-tie switch, and then the first SVG and the second SVG are controlled to coordinate to perform reactive compensation on the power supply line, so that the line needing reactive compensation can be determined more accurately, and the compensation efficiency is improved.
Preferably, the controller is specifically further configured to: when the first bus-tie switch is not closed and the second bus-tie switch is not closed, controlling the first SVG to perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply, and controlling the second SVG to perform reactive compensation on the second transformer and the connecting line between the second transformer and the input power supply.
When the first bus-tie switch and the second bus-tie switch are not closed, the fact that no power supply line breaks down is indicated, and the first SVG and the second SVG only perform corresponding reactive compensation on the line where the first SVG and the second SVG are located respectively.
Preferably, the input voltage of the first transformer and the second transformer is 110KV or 35KV, and the output voltage is 10KV. The transformer of 110KV/35KV to 10KV is a main transformer of a natural gas long-distance pipeline station.
Preferably, the first current transformer and the second current transformer are current transformers for measuring electric charge. The mutual inductance current detected by the current transformer for measuring the electric charge is more accurate, and the accuracy of the coordination reactive compensation of the two SVGs is improved.
Let transformer input voltage be 110KV, output voltage be 10KV, first current transformer CT1 is located first transformer and advances the line, and second current transformer CT2 is located the second transformer and advances the line, and first female pair of switches is located 110KV female line, and the second female pair of switches is located 10KV female line, and first displacement sensor is 110M, and the second displacement sensor is 10M.110M is 1, which represents that the first bus-tie switch is closed, and 0 represents that the first bus-tie switch is opened; when 10M is 1, the second bus-tie switch is closed, and when 0 time the second bus-tie switch is opened; CT1 is 1, which means that current flows through the first transformer, namely, the first incoming line has current, and CT1 is 0, which means that no current flows through the first transformer; CT2 represents that current flows through the second transformer when it is 1, i.e. no current flows through the second transformer when it is 0. Table 1 shows the relationship between two SVGs and the above parameters and the summary. Wherein X represents any case.
TABLE 1
Since part of the conditions do not exist, if the first bus-tie switch and the second bus-tie switch are not closed at the same time, after the table 1 is sorted, the relation between the two SVGs and the parameters and the description summary table 2 are obtained. Wherein X represents any case.
TABLE 2
As shown in fig. 2, the SVG coordinated compensation method provided by the embodiment of the present invention includes the following steps:
s10: a first current transformer arranged between the first transformer and the input power supply detects whether current flows into the first transformer; a second current transformer arranged between the second transformer and the input power supply detects whether current flows into the second transformer.
S20: when current flows into the first transformer and no current flows into the second transformer, the controller controls the first SVG and the second SVG to perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply together; when no current flows into the first transformer and current flows into the second transformer, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the second transformer and a connecting line between the second transformer and the input power supply.
Preferably, the method further comprises the steps of:
s30: the first displacement sensor detects whether a first bus-bar switch connected with the input end of the first transformer and the input end of the second transformer is closed or not; the second displacement sensor detects whether a second bus-tie switch connected with the output end of the first transformer and the output end of the second transformer is closed or not.
It should be noted that step S30 is performed before step S20, and step S30 may be preferably performed in parallel with step S10.
The step S20 specifically includes the following parallel sub-steps:
s21: when current flows into the first transformer and no current flows into the second transformer, the first bus-tie switch is closed, and the second bus-tie switch is not closed, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply.
S22: when current flows into the first transformer and no current flows into the second transformer, the first bus-tie switch is not closed, and the second bus-tie switch is closed, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply.
S23: when no current flows into the first transformer, current flows into the second transformer, the first bus-tie switch is closed, and the second bus-tie switch is not closed, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the second transformer and the connecting line between the second transformer and the input power supply.
S24: when no current flows into the first transformer, current flows into the second transformer, the first bus-tie switch is not closed, and the second bus-tie switch is closed, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the second transformer and the connecting line between the second transformer and the input power supply.
Preferably, the step S20 specifically further includes the following sub-steps:
s25: when the first bus-tie switch is not closed and the second bus-tie switch is not closed, the controller controls the first SVG to perform reactive compensation on the first transformer and the connection line between the first transformer and the input power supply, and controls the second SVG to perform reactive compensation on the second transformer and the connection line between the second transformer and the input power supply.
Note that, step S25 and steps S21, S22, S23, and S24 are parallel steps.
Preferably, the input voltage of the first transformer and the second transformer is 110KV or 35KV, and the output voltage is 10KV.
Preferably, the first current transformer and the second current transformer are current transformers for measuring electric charge.
The reader will appreciate that in the description of this specification, a description of terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. An SVG coordination compensation system is characterized by comprising a first current transformer, a second current transformer, a first transformer, a second transformer, a first SVG, a second SVG and a controller; the first transformer input end is electrically connected with an input power supply, the output end is electrically connected with a first SVG, the second transformer input end is electrically connected with the input power supply, the output end is electrically connected with a second SVG, and the controller is respectively electrically connected with the first current transformer, the second current transformer, the first SVG and the second SVG;
the first current transformer is arranged between the first transformer and the input power supply and is used for detecting whether current flows into the first transformer or not;
the second current transformer is arranged between the second transformer and the input power supply and is used for detecting whether current flows into the second transformer or not;
the system further comprises a first bus-tie switch, a second bus-tie switch, a first displacement sensor and a second displacement sensor; the first transformer input end is electrically connected with the second transformer input end through a first bus-bar switch, the first transformer output end is electrically connected with the second transformer output end through a second bus-bar switch, the first displacement sensor is electrically connected with the first bus-bar switch, the second displacement sensor is electrically connected with the second bus-bar switch, and the controller is respectively electrically connected with the first displacement sensor and the second displacement sensor;
the first displacement sensor is used for detecting whether the first bus-tie switch is closed or not;
the second displacement sensor is used for detecting whether the second bus-tie switch is closed or not;
the controller is specifically configured to:
when current flows into the first transformer and no current flows into the second transformer, the first bus-tie switch is closed, and the second bus-tie switch is not closed, the first SVG and the second SVG are controlled to perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply together;
when current flows into the first transformer and no current flows into the second transformer, the first bus-tie switch is not closed, and the second bus-tie switch is closed, the first SVG and the second SVG are controlled to perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply together;
when no current flows into the first transformer and current flows into the second transformer, the first bus-tie switch is closed, and the second bus-tie switch is not closed, the first SVG and the second SVG are controlled to perform reactive compensation on the second transformer and a connecting line between the second transformer and an input power supply together;
when no current flows into the first transformer, current flows into the second transformer, the first bus-tie switch is not closed, and the second bus-tie switch is closed, the first SVG and the second SVG are controlled to perform reactive compensation on the second transformer and a connecting line between the second transformer and an input power supply.
2. The SVG coordinated compensation system of claim 1, wherein the controller is further operable to:
when the first bus-tie switch is not closed and the second bus-tie switch is not closed, controlling the first SVG to perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply, and controlling the second SVG to perform reactive compensation on the second transformer and the connecting line between the second transformer and the input power supply.
3. The SVG coordinated compensation system of any one of claims 1 to 2, wherein the first and second transformers have an input voltage of 110KV or 35KV and an output voltage of 10KV.
4. The SVG coordinated compensation system of claim 3 wherein said first current transformer and said second current transformer are electric fee metering current transformers.
5. An SVG coordinated compensation method, comprising the steps of:
s10: a first current transformer arranged between the first transformer and the input power supply detects whether current flows into the first transformer; the second current transformer is arranged between the second transformer and the input power supply and used for detecting whether current flows into the second transformer or not;
s20: when current flows into the first transformer and no current flows into the second transformer, the controller controls the first SVG and the second SVG to perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply together; when no current flows into the first transformer and current flows into the second transformer, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the second transformer and a connecting line between the second transformer and an input power supply;
the method further comprises the steps of:
s30: the first displacement sensor detects whether a first bus-bar switch connected with the input end of the first transformer and the input end of the second transformer is closed or not; the second displacement sensor detects whether a second bus-bar switch connected with the output end of the first transformer and the output end of the second transformer is closed or not;
the step S20 specifically includes the following parallel sub-steps:
s21: when current flows into the first transformer and no current flows into the second transformer, the first bus-tie switch is closed, and the second bus-tie switch is not closed, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply;
s22: when current flows into the first transformer and no current flows into the second transformer, the first bus-tie switch is not closed, and the second bus-tie switch is closed, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the first transformer and a connecting line between the first transformer and an input power supply;
s23: when no current flows into the first transformer and current flows into the second transformer, the first bus-tie switch is closed, and the second bus-tie switch is not closed, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the second transformer and a connecting line between the second transformer and an input power supply;
s24: when no current flows into the first transformer, current flows into the second transformer, the first bus-tie switch is not closed, and the second bus-tie switch is closed, the controller controls the first SVG and the second SVG to jointly perform reactive compensation on the second transformer and the connecting line between the second transformer and the input power supply.
6. The SVG coordinated compensation method of claim 5, wherein said step S20 specifically further comprises the sub-steps of:
s25: when the first bus-tie switch is not closed and the second bus-tie switch is not closed, the controller controls the first SVG to perform reactive compensation on the first transformer and the connection line between the first transformer and the input power supply, and controls the second SVG to perform reactive compensation on the second transformer and the connection line between the second transformer and the input power supply.
7. The SVG coordinated compensation method of any one of claims 5 to 6, wherein the input voltage of the first and second transformers is 110KV or 35KV and the output voltage is 10KV.
8. The SVG coordinated compensation method of claim 7, wherein the first current transformer and the second current transformer are current transformers for electricity fee metering.
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| CN202094644U (en) * | 2011-06-20 | 2011-12-28 | 辽宁省电力有限公司丹东供电公司 | High-voltage static var generator grid connected structure |
| CN203071579U (en) * | 2012-12-28 | 2013-07-17 | 安徽天沃电气技术有限公司 | SVG (Static Var Generator) control system specially used for low-voltage double-bus double-segment wiring |
| CN203617717U (en) * | 2013-11-15 | 2014-05-28 | 南京钢铁股份有限公司 | SVC feedback circuit used for multiple power supplies |
| CN204391755U (en) * | 2015-01-22 | 2015-06-10 | 辽宁电能发展股份有限公司 | Reactive Power Compensation Eqyuipment in Substation |
| CN206389119U (en) * | 2016-12-13 | 2017-08-08 | 新风光电子科技股份有限公司 | A kind of SVG control systems for multistage bus |
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|---|---|
| CN107591820A (en) | 2018-01-16 |
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