CN105896564A - Series compensation device and safety protection method of same - Google Patents
Series compensation device and safety protection method of same Download PDFInfo
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- CN105896564A CN105896564A CN201610390995.6A CN201610390995A CN105896564A CN 105896564 A CN105896564 A CN 105896564A CN 201610390995 A CN201610390995 A CN 201610390995A CN 105896564 A CN105896564 A CN 105896564A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 239000011787 zinc oxide Substances 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000007405 data analysis Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007726 management method Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a series compensation device and a safety protection method of the same. The device comprises a compensation capacitor, a zinc oxide assembly, a discharge current-limiting circuit, an eddy current rapid switch, a current transformer and a processor. The method comprises the following steps of acquiring current data of a power grid; and judging whether short circuit exists in the power grid or not according to the current data, if yes, controlling the eddy current rapid switch to be switched off by the processor. The series compensation device is designed by the invention, a quiescent current balance function and a current safety pre-warning function are proposed, the running safety of the series compensation device is ensured, and the normal running of the power grid is guaranteed.
Description
Technical Field
The invention relates to the technical field of computer control, in particular to a series compensation device for compensating power grid voltage and a safety protection method of the series compensation device.
Background
The loss of the power grid refers to the loss and the loss of electric energy in all links such as power transmission, power transformation, distribution box marketing and the like in the process of transmitting the electric energy from a power plant to a client. The loss rate is a main economic and technical index comprehensively reflecting the planning design, production operation and operation management level of the power grid. The line loss of the power grid mainly comprises variable loss, fixed loss and management loss. Variable loss refers to the amount of power dissipated across the power line and power transformer resistances, which is proportional to the square of the transmitted power (or current). The fixed loss refers to loss generated on equivalent parallel conductance of a power line and a transformer, and mainly comprises iron loss of the power transformer, insulation medium loss of a power cable and a capacitor, leakage loss of an insulator and the like for a power distribution network. The fixed loss and the variable loss can be calculated by theory, so the fixed loss and the variable loss are often called theoretical line loss. The management loss refers to a portion of the line loss power minus the theoretical line loss. The power grid loss wastes huge electric energy every year, and influences the power supply quality, resulting in the damage of electrical appliances.
In the prior art, some power grid compensation schemes are provided, compensation is performed mainly by adopting a parallel capacitor mode, the cost is high, the response speed is low, and the compensation capacitor is easy to burn out.
Disclosure of Invention
The present invention provides the following technical solutions to overcome the above-mentioned drawbacks in the prior art.
A series compensation arrangement, comprising: a compensation capacitor, a zinc oxide component, a discharge current-limiting circuit, an eddy current fast switch, a current transformer and a processor, wherein,
the compensation capacitor is connected in series in a power supply line of the power grid and is used for compensating the voltage drop of the power grid;
the zinc oxide component is connected with the compensation capacitor in parallel and used for limiting the voltage at two ends of the compensation capacitor;
the discharge current limiting circuit is connected with the eddy current quick switch in series to form a series circuit, and the series circuit is connected with the compensation capacitor in parallel and used for limiting the discharge current of the compensation capacitor;
the processor is respectively connected with the current transformer and the eddy current quick switch;
the current transformer is used for collecting current in a power supply line and sending collected current data to the processor;
and the processor controls the on-off of the eddy current quick switch according to the current data.
Preferably, the series compensation device further includes: a first switch, a second switch and a hot standby switch,
the first switch and the second switch are connected in series;
the compensation capacitor is connected in series between the first switch and the second switch;
the zinc oxide component and the compensation capacitor are connected in parallel to form a parallel circuit, and the parallel circuit is positioned between the first switch and the second switch;
the discharge current limiting circuit and the eddy current fast switch are positioned between the first switch and the second switch;
the hot standby switch is connected in parallel with the first switch and the second switch.
A safety protection method of the series compensation device comprises the following steps:
s1: collecting current data in a power grid;
s2: judging whether a short circuit exists in the power grid or not according to the current data;
s3: a response operation is started according to the determination result in S2.
Preferably, the step S1 specifically includes:
a current transformer is used for setting a sampling point every 0.1ms, 10 current data are collected, and the collected current data are stored in an array current [10 ].
Preferably, the step S2 specifically includes:
processing the current data in the logarithm group current [10] to obtain the change rate of the current of each sampling point, and storing the change rate in the logarithm group diff _ current [10], wherein:
if i>1
Wherein i represents the number of the array, i is more than or equal to 1 and less than or equal to 10;
constructing a static current balance function:
i is the passing current, I0 is the maximum current passing through the series compensation device when the power grid normally works, and is obtained through log data of the power grid operation;
obtaining a maximum value diff _ current [ j ] in the array diff _ current [10], wherein the maximum value diff _ current [ j ] represents that the current change rate at the moment is maximum, j is more than or equal to 1 and less than or equal to 10, obtaining a current value current [ j ] at the moment from the array current [10], and constructing a current safety early warning function:
g (j) ═ α × F (current [ j ]) + β diff _ current [ j ], α and β are weighted values respectively, G0 is a short-circuit threshold value, and can be obtained by simulation calculation or grid log data analysis,
and when the current safety early warning function value G (j) > G0, judging that the power grid is short-circuited.
Preferably, the step S3 specifically includes:
and according to the judgment result of the step S2, when the power grid is short-circuited, the processor controls the eddy current quick switch to be closed, so that the series compensation device is protected.
The invention has the beneficial effects that: the series compensation device is designed, a static current balance function and a current safety early warning function are provided, the operation safety of the series compensation device is ensured, and the normal operation of a power grid is ensured.
Drawings
Fig. 1 is a schematic configuration diagram of a series compensation apparatus of the present invention.
Fig. 2 is a flow chart of a safety protection method of a series compensation device according to the present invention.
Detailed Description
The series compensation device and the safety protection method thereof according to the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a series compensation apparatus for compensating for a voltage drop of a power grid includes: the device comprises a first switch 1, a second switch 2, a compensation capacitor 3, a zinc oxide component 4, a discharge current limiting circuit 5, an eddy current fast switch 6, a hot standby switch 7, a current transformer 8 and a processor 9.
The first switch 1 and the second switch 2 are connected in series, the compensation capacitor 3 is connected in series between the first switch 1 and the second switch 2, and the compensation capacitor 3 is used for compensating line voltage drop. Zinc oxide subassembly 4 and compensation capacitance 3 are parallelly connected, and the circuit after parallelly connected is established ties again between first switch 1 and second switch 2, and zinc oxide subassembly 4 is used for protecting the compensation capacitance, restricts the voltage at compensation capacitance both ends. The discharging current-limiting circuit 5 is connected in series with the eddy current fast switch 6 and then connected in parallel with the compensation capacitor 3, and the circuit after being connected in parallel is connected in series between the first switch 1 and the second switch 2. The hot standby switch 7 is connected in parallel with a power supply line where the first switch 1 and the second switch 2 are located, and is in an open state in normal operation. The current transformer 8 is preferably arranged at the front end of the second switch 2, and may of course be arranged at other positions of the power supply line as long as it is convenient to collect the current in the power supply line. The processor 9 is connected with the current transformer 8 in series, the processor 9 is connected with the eddy current quick switch 6, the processor 9 receives current data collected by the current transformer 8, and the on-off of the eddy current quick switch 6 is controlled according to a processing result of the current data.
The working principle of the current transformer 8 is the electromagnetic induction principle. The current transformer 8 is composed of a closed iron core and a winding. The primary winding of the transformer has few turns and is connected in a line needing to measure current, so the transformer usually has the whole current of the line flowing through. The secondary winding has more turns and is connected in series in the measuring instrument and the protection circuit, and when the current transformer 8 works, the secondary circuit of the current transformer is always closed, so that the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer 8 is close to short circuit. Due to the problems of easy saturation, nonlinearity, narrow frequency band, and the like of the electromagnetic current transformer, the electronic current transformer 8 has gradually risen. The electronic current transformer generally has the advantages of magnetic saturation resistance, low power consumption, wide frequency band and the like, belongs to a digital sensor, and does not introduce errors into a secondary instrument, wherein the errors of the sensor are systematic errors. Therefore, the current transformer 8 is preferably an electronic current transformer, and can simplify the circuit design, eliminate the need for analog-to-digital conversion, and reduce errors.
The zinc oxide component 4 developed by adopting a dynamic homoenergetic technology is used for effectively limiting the voltage at two ends of the compensation capacitor 3, and guarantees the running safety of the compensation capacitor 3. The invention adopts the processor 9 to quickly determine the safety state of the series compensation device and the eddy current quick switch 6 developed based on the quick eddy current driving technology to control the on and off of the compensation capacitor 3, thereby shortening the duration time of over current to the maximum extent and greatly reducing the energy capacity required by the zinc oxide component 4. The zinc oxide component 4 can adopt a dynamic homoenergetic matching technology and is formed by connecting a plurality of zinc oxide valve plates in series and in parallel, so that the residual voltage ratio (the ratio of the highest residual voltage UC to the 1mA reference voltage U1 mA) is greatly reduced, and the volume is obviously reduced under the same energy capacity index.
The discharge current limiting circuit 5 is composed of a resistor and an inductor, and prevents the contact of the eddy current quick switch 6 from being damaged due to overlarge discharge current. The closing time of the eddy current fast switch 6 can be about 10ms or even faster.
Fig. 2 shows a safety protection method of the series compensation device of the present invention, comprising the steps of:
s1: collecting current data in a power grid: setting a sampling point every 0.1ms by using a current transformer 8, collecting 10 current data, and storing the collected current data in an array current [10 ];
s2: judging whether a short circuit exists in the power grid according to the current data, if so, controlling the eddy current fast switch 6 to be closed by the processor 9, and the specific steps can be as follows:
processing the current data in the logarithm group current [10] to obtain the change rate of the current of each sampling point, and storing the change rate in the logarithm group diff _ current [10], wherein:
if i>1
Wherein i represents the number of the array, i is more than or equal to 1 and less than or equal to 10;
constructing a static current balance function:
i is the passing current, I0 is the maximum current passing through the series compensation device when the power grid normally works, and can be obtained through log data of the power grid operation, and the calculation speed is greatly improved through the static current balance function;
obtaining a maximum value diff _ current [ j ] in the array diff _ current [10], wherein the maximum value diff _ current [ j ] represents that the current change rate at the moment is maximum, j is more than or equal to 1 and less than or equal to 10, obtaining a current value current [ j ] at the moment from the array current [10], and constructing a current safety early warning function:
g (j) ═ α × F (current [ j ]) + β × diff _ current [ j ], α and β are weighted values, respectively, and when the function value G (j) > G0 indicates that the grid is dangerous, the processor 9 controls the eddy current fast switch 6 to close, protecting the series compensation device, wherein G0 is a short-circuit threshold value, which can be obtained by simulation calculation or grid log data analysis, and the values of α and β are determined according to grid parameters, such as a 35KV grid, α is generally 2, β is generally 3.5, and G0 is generally 8.
The safety protection identifies danger accurately according to the magnitude of current and the change rate of the current, is high in speed, can identify the danger basically within 2ms, and then controls the eddy current quick switch 6 to be switched on, so that the safety of the series compensation device is ensured.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (6)
1. A series compensation apparatus, comprising: the device comprises a compensation capacitor, a zinc oxide component, a discharge current limiting circuit, an eddy current fast switch, a current transformer and a processor; wherein,
the compensation capacitor is connected in series in a power supply line of the power grid and is used for compensating the voltage drop of the power grid;
the zinc oxide component is connected with the compensation capacitor in parallel and used for limiting the voltage at two ends of the compensation capacitor;
the discharge current limiting circuit is connected with the eddy current quick switch in series to form a series circuit, and the series circuit is connected with the compensation capacitor in parallel and used for limiting the discharge current of the compensation capacitor;
the processor is respectively connected with the current transformer and the eddy current quick switch;
the current transformer is used for collecting current in a power supply line and sending collected current data to the processor;
and the processor controls the on-off of the eddy current quick switch according to the current data.
2. The series compensation apparatus of claim 1, further comprising: a first switch, a second switch and a hot standby switch,
the first switch and the second switch are connected in series;
the compensation capacitor is connected in series between the first switch and the second switch;
the zinc oxide component and the compensation capacitor are connected in parallel to form a parallel circuit, and the parallel circuit is positioned between the first switch and the second switch;
the discharge current limiting circuit and the eddy current fast switch are positioned between the first switch and the second switch;
the hot standby switch is connected in parallel with the first switch and the second switch.
3. A method of securing a series compensation arrangement as claimed in claim 1, comprising the steps of:
s1: collecting current data in a power grid;
s2: judging whether a short circuit exists in the power grid or not according to the current data;
s3: a response operation is started according to the determination result in S2.
4. The security protection method according to claim 2, wherein the step S1 specifically comprises:
a current transformer is used for setting a sampling point every 0.1ms, 10 current data are collected, and the collected current data are stored in an array current [10 ].
5. The safety protection method according to claim 3, wherein the step S2 specifically comprises:
processing the current data in the logarithm group current [10] to obtain the change rate of the current of each sampling point, and storing the change rate in the logarithm group diff _ current [10], wherein:
wherein i represents the number of the array, i is more than or equal to 1 and less than or equal to 10;
constructing a static current balance function:
i is the passing current, I0 is the maximum current passing through the series compensation device when the power grid normally works, and is obtained through log data of the power grid operation;
obtaining a maximum value diff _ current [ j ] in the array diff _ current [10], wherein the maximum value diff _ current [ j ] represents that the current change rate at the moment is maximum, j is more than or equal to 1 and less than or equal to 10, obtaining a current value current [ j ] at the moment from the array current [10], and constructing a current safety early warning function:
g (j) ═ α × F (current [ j ]) + β diff _ current [ j ], α and β are weighted values respectively, G0 is a short-circuit threshold value, and can be obtained by simulation calculation or grid log data analysis,
and when the current safety early warning function value G (j) > G0, judging that the power grid is short-circuited.
6. The security protection method of claim 4, wherein: the step of S3 is specifically:
and according to the judgment result of the step S2, when the power grid is short-circuited, the processor controls the eddy current quick switch to be closed, so that the series compensation device is protected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610390995.6A CN105896564B (en) | 2016-06-03 | 2016-06-03 | The method for security protection of series compensation device and series compensation device |
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| CN201610390995.6A CN105896564B (en) | 2016-06-03 | 2016-06-03 | The method for security protection of series compensation device and series compensation device |
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| CN105896564B CN105896564B (en) | 2018-06-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110021927A (en) * | 2018-01-09 | 2019-07-16 | 江苏南瑞泰事达电气有限公司 | A kind of the control guard method and system of power distribution network serial connection capacitor compensating device |
| CN110752589A (en) * | 2018-07-23 | 2020-02-04 | 智能电线股份有限公司 | Early detection of faults in power transmission lines |
| CN111971093A (en) * | 2018-04-11 | 2020-11-20 | 德尔格安全股份两合公司 | Blower filter device for explosion-hazard areas and method for operating a blower filter device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110752589B (en) * | 2018-07-23 | 2023-08-22 | 智能电线股份有限公司 | Power flow control system and transmission line fault detection, reporting and response method |
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