CN111130143B - Small hydropower station rapid synchronization method for directly comparing voltage sampling values - Google Patents
Small hydropower station rapid synchronization method for directly comparing voltage sampling values Download PDFInfo
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- CN111130143B CN111130143B CN201911285009.0A CN201911285009A CN111130143B CN 111130143 B CN111130143 B CN 111130143B CN 201911285009 A CN201911285009 A CN 201911285009A CN 111130143 B CN111130143 B CN 111130143B
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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Abstract
The invention provides a small hydropower station quick synchronization method for directly comparing voltage sampling values, and a small hydropower station packageComprises a voltage transformer and a rapid synchronization system, wherein the voltage transformer collects the voltage U of the small hydropower station sideXAnd distribution network voltage ULIs conveyed to a quick synchronizing system, and the quick synchronizing system enables the voltage U of the small hydropower sideXAnd distribution network voltage ULComparing, and controlling the reclosing of the small hydropower station to be started by the rapid synchronization system according to a comparison result; in the invention, the acquisition points are randomly selected, so that the reliability of the method is improved; by applying a small hydroelectric side voltage UXAnd distribution network voltage ULDirect comparison is carried out, and when the two are close, direct grid connection is carried out, so that the method is simple and convenient, and the power failure time is shortened; by judging whether a/n is more than or equal to 0.8, the influence of the fluctuation of the voltage or the misdetection of the voltage sampling on the authenticity of the data is avoided.
Description
Technical Field
The invention relates to the field of small hydropower station grid connection, in particular to a small hydropower station rapid synchronization method for directly comparing voltage sampling values.
Background
The existing closing schemes all need long waiting time, and at the cost of disconnecting all small power supplies in the area, reclosing needs to be carried out on the small hydropower stations again after the small hydropower stations are disconnected, at the moment, for the distributed small hydropower stations, more time is consumed for re-operating grid connection, the operation is also complex, the recovery of a normal power grid operation mode needs a long time, short-time power failure of a line cannot be avoided, and the requirement of a client on power supply reliability cannot be met.
The existing implementation scheme adopts the existing small hydropower grid-connected intelligent electronic equipment and a multi-purpose full-wave Fourier algorithm, at least one cycle data window (20 ms) is needed, the calculation process is complex, firstly, the full-wave Fourier calculation needs to be carried out on the collected voltages of the small hydropower side and the power distribution network side, then, three quantities of voltage amplitude, phase and frequency of the small hydropower side and the power distribution network side need to be calculated and extracted, and finally, the extracted three quantities of voltage amplitude, phase and frequency need to be compared one by one to judge whether the grid-connected requirement is met.
The method has longer fault detection time, leads to longer power restoration time, and thus leads to lower power supply reliability. Meanwhile, when a fault occurs, the power distribution network adjusts the voltage parameters by cutting off the power supply end or the load end, so that the closing time can be greatly prolonged.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a small hydropower station rapid synchronization method for directly comparing voltage sampling values and switching on in a short time.
In order to achieve the purpose, the technical scheme of the invention is as follows: a small hydropower station rapid synchronization method for directly comparing voltage sampling values comprises a voltage transformer and a rapid synchronization system, wherein the voltage transformer collects the voltage U of the small hydropower station sideXAnd distribution network voltage ULIs conveyed to a quick synchronizing system, and the quick synchronizing system enables the voltage U of the small hydropower sideXAnd distribution network voltage ULComparing, and controlling the reclosing of the small hydropower station to be started by the rapid synchronization system according to a comparison result;
when the small hydropower stations are synchronized rapidly, the method comprises the following steps:
a) whether the small hydropower station detects tripping; if yes, performing step b);
b) starting a rapid synchronous system, and randomly setting acquisition points and the number n of the acquisition points; setting the value of a; the acquisition point is an acquisition time point; the initial value of a is 0; a is small hydropower side voltage UXAnd distribution network voltage ULC) setting the number of the similar conforming points, and finishing the step c);
c) small hydropower side voltage U with voltage transformer randomly collecting n valuesXAnd distribution network voltage UL(ii) a Small hydropower side voltage UXAnd distribution network voltage ULThe acquisition quantity of the voltage transformer is the same, n sampling time points are randomly set, and the voltage transformer carries out voltage U on the small hydropower station side at the same time pointXAnd distribution network voltage ULSynchronously collecting; and transmits the collected data to the blockA fast synchronization system, then step d);
d) the fast synchronization system will correspond to the small hydropower side voltage U at the same point in timeXAnd distribution network voltage ULMaking a comparison and then performing step e)
e) Judge UX≈|ULIf |, performing step f) if the |, and if not, performing step i);
f) the a = a +1 operation is performed,
g) judging whether a/n is more than or equal to 0.8, if yes, performing step h); if not, performing step i);
h) starting a reclosing switch;
i) the fast synchronization system will correspond to the small hydropower side voltage U at another point in timeXAnd distribution network voltage ULA comparison is made and then step e) is performed.
In the method, the acquisition points are randomly selected, so that the reliability of the method is improved; by applying a small hydroelectric side voltage UXAnd distribution network voltage ULDirect comparison is carried out, and when the two are close, direct grid connection is carried out, so that the method is simple and convenient, and the power failure time is shortened; by judging whether a/n is more than or equal to 0.8, the influence of the fluctuation of the voltage or the misdetection of the voltage sampling on the authenticity of the data is avoided.
Thus ensuring the voltage U of the small hydropower sideXAnd distribution network voltage ULThe synchronism of (2).
Thus the voltage U of the small hydropower sideXAnd distribution network voltage ULHas comparability between them.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the small hydropower station rapid synchronization method for directly comparing voltage sampling values comprises a voltage transformer and a rapid synchronization system, wherein the voltage transformer collects the voltage U of the small hydropower station sideXAnd distribution network voltage ULTo a rapid synchronization systemThe phase system converts the voltage U of the small hydropower sideXAnd distribution network voltage ULAnd comparing, and controlling the reclosing of the small hydropower station to be started by the rapid synchronization system according to a comparison result.
When the small hydropower stations are synchronized rapidly, the method comprises the following steps:
a) whether the small hydropower station detects tripping; if yes, performing step b);
b) starting a rapid synchronous system, and randomly setting acquisition points and the number n of the acquisition points; setting the value of a; the acquisition point is an acquisition time point; the initial value of a is 0; a is small hydropower side voltage UXAnd distribution network voltage ULC) setting the number of the similar conforming points, and finishing the step c);
c) small hydropower side voltage U with voltage transformer randomly collecting n valuesXAnd distribution network voltage UL(ii) a Small hydropower side voltage UXAnd distribution network voltage ULThe acquisition quantity of the voltage transformer is the same, n sampling time points are randomly set, and the voltage transformer carries out voltage U on the small hydropower station side at the same time pointXAnd distribution network voltage ULSynchronously collecting; transmitting the collected data to a rapid synchronization system, and then performing step d);
d) the fast synchronization system will be small hydropower side voltage UXAnd distribution network voltage ULMaking a comparison and then performing step e)
e) Judge UX≈|ULIf |, performing step f) if the |, and if not, performing step i);
f) the a = a +1 operation is performed,
g) judging whether a/n is more than or equal to 0.8, if yes, performing step h); if not, performing step i);
h) starting a reclosing switch;
i) the fast synchronization system will correspond to the small hydropower side voltage at another point in time
And distribution network voltage
Ratio of performanceThen, step e) is performed.
In the invention, the acquisition point is the voltage U at the small hydropower sideXAnd distribution network side voltage ULIs randomly selected in a quarter period, and the value of n is set in the period and is the voltage U of the small hydropower sideXAnd distribution network voltage ULThe number of acquisition points; small hydropower side voltage U with same acquisition quantity and same time point of voltage transformerXAnd distribution network voltage UL(ii) a Thus ensuring the voltage U of the small hydropower sideXAnd distribution network voltage ULThe synchronism of (2). The rapid synchronization system will correspond to the small hydropower side voltage U on the same time band pointXAnd distribution network voltage ULA comparison is made. This is comparable. a is small hydropower side voltage UXAnd distribution network voltage ULSimilar number of conforming points. The initial value of a is 0. This a improves the reliability of the method.
In the embodiment, the value of n is 5, and the voltage U of the small hydropower sideXAnd distribution network voltage ULFive are provided. Acquisition points include time point T1, time point T2, time point T3, time point T4, and time point T5; small hydropower side voltage UXIncluding a voltage U X1. Voltage UX2. Voltage UX3. Voltage UX4 and voltage UX5; distribution network voltage ULIncluding a voltage U L1. Voltage UL2. Voltage UL3. Voltage UL4 and voltage UL5。
Voltage UX1. Voltage UX2. Voltage UX3. Voltage UX4 and voltage UX5 are small hydroelectric side voltage U respectivelyXReal-time voltages at time point T1, time point T2, time point T3, time point T4, and time point T5.
Voltage UL1. Voltage UL2. Voltage UL3. Voltage UL4 and voltage UL5 distribution network voltage ULReal-time voltages at time point T1, time point T2, time point T3, time point T4, and time point T5.
At time point T1, the voltage transformer couples voltage U L1 and voltage U L1, collecting; at the time pointT2, voltage transformer to voltage UL2 and voltage UL2, collecting; voltage transformer pair voltage U at time point T3L3 and voltage UL3, collecting; at time point T4, the voltage transformer couples voltage UL4 and voltage UL4, collecting the voltage U by the voltage transformer at a time point T5L5 and voltage UL 
And 5, collecting.
Fast synchronization system will voltage U L1 and voltage U L1, carrying out comparison; when voltage U L1 and voltage U L1 are similar in value; the time point T1 is a coincidence point; then there is one coincident point in the five acquisition points; and when the proportion of the coincidence point in the acquisition point reaches more than 80%, starting a reclosing switch to close the switch.
In the method, the acquisition points are randomly selected, so that the reliability of the method is improved; by applying a small hydroelectric side voltage UXAnd distribution network voltage ULDirect comparison is carried out, and when the two are close, direct grid connection is carried out, so that the method is simple and convenient, and the power failure time is shortened; by judging whether a/n is more than or equal to 0.8, the influence of the fluctuation of the voltage or the misdetection of the voltage sampling on the authenticity of the data is avoided.
Claims (1)
1. A small hydropower rapid synchronization method for directly comparing voltage sampling values is characterized in that: the small hydropower station comprises a voltage transformer and a rapid synchronization system, wherein the voltage transformer is used for collecting the voltage U of the small hydropower station sideXAnd distribution network voltage ULIs conveyed to a quick synchronizing system, and the quick synchronizing system enables the voltage U of the small hydropower sideXAnd distribution network voltage ULComparing, and controlling the reclosing of the small hydropower station to be started by the rapid synchronization system according to a comparison result;
when the small hydropower stations are synchronized rapidly, the method comprises the following steps:
a) whether the small hydropower station detects tripping; if yes, performing step b);
b) starting the system at the same time, randomly setting the collection pointsThe number n; setting the value of a; the acquisition point is an acquisition time point; the initial value of a is 0; a is small hydropower side voltage UXAnd distribution network voltage ULC) setting the number of the similar conforming points, and finishing the step c);
c) small hydropower side voltage U with voltage transformer randomly collecting n valuesXAnd distribution network voltage UL(ii) a Small hydropower side voltage UXAnd distribution network voltage ULThe acquisition quantity of the voltage transformer is the same, n sampling time points are randomly set, and the voltage transformer carries out voltage U on the small hydropower station side at the same time pointXAnd distribution network voltage ULSynchronously collecting; transmitting the collected data to a rapid synchronization system, and then performing step d);
d) the fast synchronization system will correspond to the small hydropower side voltage U at the same point in timeXAnd distribution network voltage ULComparing, and then carrying out step e);
e) judge UX≈|ULIf |, performing step f) if the |, and if not, performing step i);
f) the a = a +1 operation is performed,
g) judging whether a/n is more than or equal to 0.8, if yes, performing step h); if not, performing step i);
h) starting a reclosing switch;
i) the fast synchronization system will correspond to the small hydropower side voltage U at another point in timeXAnd distribution network voltage ULA comparison is made and then step e) is performed.
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| CN101719679A (en) * | 2009-12-21 | 2010-06-02 | 中国电力科学研究院 | Method for synchronizing distributed power supply and power grid |
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| US10103544B2 (en) * | 2016-02-05 | 2018-10-16 | Sungrow Power Supply Co., Ltd. | Medium and high voltage grid-connected power generation system, medium and high voltage grid-connected system and control unit thereof |
| CN110429660A (en) * | 2019-07-19 | 2019-11-08 | 国家电网有限公司 | A kind of generator connecting in parallel with system asynchronous switch-on pulse issues the determination method of time |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795087B (en) * | 2014-02-20 | 2015-11-18 | 国电南瑞科技股份有限公司 | The level and smooth simultaneous interconnecting control method of a kind of micro-capacitance sensor |
| CN106026195B (en) * | 2016-07-21 | 2022-06-21 | 中国电力科学研究院 | Control method for synchronous closing and grid connection of micro-grid group |
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- 2019-12-13 CN CN201911285009.0A patent/CN111130143B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101719679A (en) * | 2009-12-21 | 2010-06-02 | 中国电力科学研究院 | Method for synchronizing distributed power supply and power grid |
| CN101876690A (en) * | 2010-05-28 | 2010-11-03 | 长沙威克电力技术科技有限公司 | Generator contemporary process monitoring and analyzing system |
| CN102075001A (en) * | 2010-06-25 | 2011-05-25 | 广东省电力调度中心 | Intelligent incoming line backup power automatic switching method and device suitable for areas with abundant small hydroelectric stations |
| CN103560535A (en) * | 2013-11-20 | 2014-02-05 | 北京四方继保自动化股份有限公司 | Micro-grid operation mode seamless switching method based on energy storage current transformer |
| US10103544B2 (en) * | 2016-02-05 | 2018-10-16 | Sungrow Power Supply Co., Ltd. | Medium and high voltage grid-connected power generation system, medium and high voltage grid-connected system and control unit thereof |
| CN110429660A (en) * | 2019-07-19 | 2019-11-08 | 国家电网有限公司 | A kind of generator connecting in parallel with system asynchronous switch-on pulse issues the determination method of time |
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