CN112104004B - Voltage signal synchronous detection method for new energy power generation grid-connected control - Google Patents
Voltage signal synchronous detection method for new energy power generation grid-connected control Download PDFInfo
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- CN112104004B CN112104004B CN202010932401.6A CN202010932401A CN112104004B CN 112104004 B CN112104004 B CN 112104004B CN 202010932401 A CN202010932401 A CN 202010932401A CN 112104004 B CN112104004 B CN 112104004B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
Abstract
The invention provides a voltage signal synchronous detection method for new energy power generation grid-connected control, which comprises the following steps of: s10, setting N sampling points of the three-phase voltage of the power grid side and the three-phase voltage of the power generation side in a single sampling period; s20, respectively calculating K of the mth sampling point in N sampling points of the three-phase voltage on the power grid side and the three-phase voltage on the power generation side in a single sampling periodmA value; s30, K according to three-phase voltagemValue, calculating the difference A of each phase voltagem、Bm、CmA value; s40, pair Am、Bm、CmBinary coding the value and obtaining an accumulated value R; and S50, judging whether the voltage signals of the grid side and the power generation side are synchronous or not according to the R value. The voltage signal synchronous detection method for the new energy power generation grid-connected control avoids the processes of respectively calculating the input voltage frequency, the voltage amplitude value, the phase information and the like of the power generation side and the power grid side, is flexible to control, is high in safety and reliability, and provides a simple and effective method for the new energy power generation grid-connected control.
Description
Technical Field
The invention relates to the technical field of new energy power generation grid-connected control, in particular to a voltage signal synchronous detection method for new energy power generation grid-connected control.
Background
In recent years, energy and environmental problems are increasingly prominent, and new energy power generation represented by wind power is rapidly developed and becomes an important component of a power system. However, unlike the traditional fossil energy power generation mode, the wind power generation has inherent random fluctuation characteristics and intermittency under the restriction of natural characteristics. Therefore, the wind power integration puts higher requirements on auxiliary services such as system integration operation, dynamic power balance and frequency modulation and voltage regulation.
Distributed power generation is a future development direction of a power system, and a centralized large power grid and the distributed power generation coexist for a long time and supplement each other. When the distributed power generation is connected to the grid, the original system network is changed, and the fluctuation of the power grid is influenced. When the output of the generator is influenced by the external interference, the voltage signal synchronous detection method which is reasonably designed can effectively control the grid connection and disconnection without influencing the normal operation of the power grid, which is an unavoidable problem.
The grid-connection control of the wind driven generator directly influences whether the generator can deliver electric energy to a power grid or not and whether the generator is impacted during grid connection or not. If the problem of voltage signal synchronization in the grid connection process is not solved, larger impact current can be generated at the moment of grid connection, and the new energy power generation system is influenced. Therefore, the voltage signal synchronous detection method with reasonable design plays a key role in improving the output quality of electric energy, improving the conversion efficiency of the electric energy and the stability of system operation.
Disclosure of Invention
In order to solve the problems, the invention provides a voltage signal synchronous detection method for new energy power generation grid-connected control, aiming at the problem of voltage signal synchronization of a new energy power generation side and a power grid side, a voltage signal synchronous detection algorithm is designed to judge the voltage signal synchronization of the power generation side and the power grid side in a sampling period, the algorithm avoids the processes of respectively calculating input voltage frequency, voltage amplitude value, phase information and the like of the power generation side and the power grid side, the structure is simple, the control is flexible, the safety and reliability are high, and a simple and effective method is provided for the new energy power generation grid-connected control.
In order to achieve the above purpose, the invention adopts a technical scheme that:
a voltage signal synchronous detection method for new energy power generation grid-connected control comprises the following steps: s10, setting N sampling points of the three-phase voltage of the power grid side and the three-phase voltage of the power generation side in a single sampling period; s20, passing formula
Respectively calculating K of the mth sampling point in N sampling points of the three-phase voltage of the power grid side and the three-phase voltage of the power generation side in a single sampling periodmA value wherein m is [1, N-1 ]]V is a voltage value, t is a sampling time; s30, converting the three-phase voltage K of the power grid sidemValue-reduced K for the three-phase voltage on the power generation sidemValue of obtaining a difference A of each phase voltagem、Bm、CmA value; s40, starting with m-1 to m-N-1, when am、Bm、CmWhen the value is equal to 0 at the same time, the binary code is "1", when A is equal tom、Bm、CmWhen the values are not equal to 0 at the same time, the binary codes are '0', and N-1 binary codes are summed to obtain a cumulative value R; s50, whether voltage signals of the power grid side and the power generation side are synchronous or not is judged through the R value, when R is larger than (N-1)/O, the voltage signals of the power grid side and the power generation side are synchronous, when R is smaller than or equal to (N-1)/O, the voltage signals of the power grid side and the power generation side are asynchronous, and O is a preset grid-connected index coefficient.
Furthermore, three-phase voltages on the power grid side are respectively an A phase, a B phase and a C phase, and N sampling points of the A phase voltage are DA(ti，Vti) N sampling points of the B phase voltage are DB(ti，Vti) N sampling points of the C phase voltage are DC(ti，Vti) (ii) a The three-phase voltage at the power generation side is respectively an A 'phase, a B' phase and a C 'phase, and N sampling points of the A' phase voltage are FA(ti，Vti) N sampling points of the phase voltage of B' are FB(ti，Vti) N sampling points of the C' phase voltage are FC(ti，Vti) (ii) a Wherein i is [1, N]Is a positive integer of (1).
Further, in the S30, the formula is expressed by am＝DA(Km)-FA(Km)，Bm＝DB(Km)-FB(Km)，Cm＝DC(Km)-FC(Km) Obtaining the difference A of each phase voltagem、Bm、CmValue, wherein DA(Km) K being the sampling point of the A phase voltagemValue, DB(Km) K being the sampling point of the B phase voltagemValue, DC(Km) K being the sampling point of the C phase voltagemValue, FA(Km) K of sampling point of A' phase voltagemValue, FB(Km) K being the sampling point of the B' phase voltagemValue, FC(Km) K being the sampling point of the C' phase voltagemThe value is obtained.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the voltage signal synchronous detection method for new energy power generation grid-connected control, aiming at the problem of voltage signal synchronization of a new energy power generation side and a power grid side, a voltage signal synchronous detection algorithm is designed to judge the voltage signal synchronization of the power generation side and the power grid side in a sampling period, the algorithm avoids the processes of respectively calculating input voltage frequency, voltage amplitude, phase information and the like of the power generation side and the power grid side, the structure is simple, the control is flexible, the safety and reliability are high, and a simple and effective method is provided for the new energy power generation grid-connected control.
Drawings
The technical solution and the advantages of the present invention will be apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a voltage signal synchronous detection method for new energy power generation grid-connected control according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating voltage signal acquisition at an a-phase power grid side and an a' phase power generation side according to an embodiment of the present invention;
FIG. 3 shows output levels of a grid side and a generator side in synchronization and asynchronization according to an embodiment of the present invention;
fig. 4 is a diagram illustrating output waveforms of a power generation side and a power grid side in a quasi-synchronous state according to an embodiment of the invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The embodiment provides a voltage signal synchronous detection method for new energy power generation grid-connected control, as shown in fig. 1, the method includes the following steps: and S10, setting N sampling points of the three-phase voltage of the power grid side and the three-phase voltage of the power generation side in a single sampling period. S20, passing formula
Respectively calculating K of the mth sampling point in N sampling points of the three-phase voltage of the power grid side and the three-phase voltage of the power generation side in a single sampling periodmA value wherein m is [1, N-1 ]]V is a voltage value, and t is a sampling time. S30, converting the three-phase voltage K of the power grid sidemValue-reduced K for the three-phase voltage on the power generation sidemValue of obtaining a difference A of each phase voltagem、Bm、CmThe value is obtained. S40, starting with m-1 to m-N-1, when am、Bm、CmWhen the value is equal to 0 at the same time, the binary code is "1", when A is equal tom、Bm、CmWhen the values are not equal to 0 at the same time, the binary codes are '0', and the N-1 binary codes are summed to obtain the accumulated value R. S50, whether voltage signals of the power grid side and the power generation side are synchronous or not is judged through the R value, when R is larger than (N-1)/O, the voltage signals of the power grid side and the power generation side are synchronous, when R is smaller than or equal to (N-1)/O, the voltage signals of the power grid side and the power generation side are asynchronous, and O is a preset grid-connected index coefficient.
The three-phase voltage at the S10 power grid side is respectively an A phase, a B phase and a C phase, and N sampling points of the A phase voltage are DA(ti，Vti) N sampling points of the B phase voltage are DB(ti，Vti) N sampling points of the C phase voltage are DC(ti，Vti). The three-phase voltage at the power generation side is respectively an A 'phase, a B' phase and a C 'phase, and N sampling points of the A' phase voltage are FA(ti，Vti) N sampling points of the phase voltage of B' are FB(ti，Vti) N sampling points of the C' phase voltage are FC(ti，Vti). Wherein i is [1, N]Is a positive integer of (1).
In the S20, K of N-1 sampling points of A phase voltagemThe value is noted as DA(Km) K of N-1 sampling points of phase voltage of BmThe value is noted as DB(Km) K of N-1 sampling points of C phase voltagemThe value is noted as DC(Km) K at N-1 sampling points of the phase voltage of AmThe value is denoted as FA(Km) K at N-1 sampling points of phase voltage of BmThe value is denoted as FB(Km) K of N-1 sampling points of C' phase voltagemThe value is denoted as FC(Km)。
In the S30, the formula is shown as Am＝DA(Km)-FA(Km)，Bm＝DB(Km)-FB(Km)，Cm＝DC(Km)-FC(Km) Obtaining the difference A of each phase voltagem、Bm、CmThe value is obtained.
As shown in fig. 2, each point represents a collection point, an arrow indicates a voltage magnitude and direction change trend, and when voltage changes of different corresponding points on the power grid side and the power generation side in adjacent sampling periods are compared one by one, the sampling periods are judged to be in a synchronous state; all the operating times are compared with the voltage change all the time, so that whether the voltage change is in a synchronous state or not is judged.
As shown in fig. 3, according to the voltage variation in the sampling period, if the voltages are the same, the flip-flop outputs a low level; if the difference is different, the different high and low levels of the pulse width are output according to the difference, and the asynchronous degree is displayed.
As shown in fig. 4, the voltage on the power generation side is continuously self-regulated, and when the voltage is detected to be synchronous with the voltage of the power grid, the power grid standard is met, and the grid connection can be started.
The above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are transformed by the content of the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. A voltage signal synchronous detection method for new energy power generation grid-connected control is characterized by comprising the following steps:
s10, setting N sampling points of the three-phase voltage of the power grid side and the three-phase voltage of the power generation side in a single sampling period;
s20, passing formula
Respectively calculating K of the mth sampling point in N sampling points of the three-phase voltage of the power grid side and the three-phase voltage of the power generation side in a single sampling periodmA value wherein m is [1, N-1 ]]V is a voltage value, t is a sampling time;
s30, converting the three-phase voltage K of the power grid sidemValue-reduced K for the three-phase voltage on the power generation sidemValue of obtaining a difference A of each phase voltagem、Bm、CmA value;
s40, starting with m-1 to m-N-1, when am、Bm、CmWhen the value is equal to 0 at the same time, the binary code is "1", when A is equal tom、Bm、CmWhen the values are not equal to 0 at the same time, the binary codes are '0', and N-1 binary codes are summed to obtain a cumulative value R;
s50, whether voltage signals of the power grid side and the power generation side are synchronous or not is judged through the R value, when R is larger than (N-1)/O, the voltage signals of the power grid side and the power generation side are synchronous, when R is smaller than or equal to (N-1)/O, the voltage signals of the power grid side and the power generation side are asynchronous, and O is a preset grid-connected index coefficient.
2. The voltage signal synchronous detection method for new energy power generation grid-connection control according to claim 1,
the three-phase voltage at the power grid side is respectively an A phase, a B phase and a C phase, and N sampling points of the A phase voltage are DA(ti，Vti) N sampling points of the B phase voltage are DB(ti，Vti) N sampling points of the C phase voltage are DC(ti，Vti)；
The three-phase voltage at the power generation side is respectively an A 'phase, a B' phase and a C 'phase, and N sampling points of the A' phase voltage are FA(ti，Vti) N sampling points of the phase voltage of B' are FB(ti，Vti) N sampling points of the C' phase voltage are FC(ti，Vti)；
Wherein i is a positive integer in [1, N ].
3. The voltage signal synchronous detection method for grid-connected control of new energy power generation as claimed in claim 2, wherein in the step S30, the voltage signal synchronous detection method is based on formula Am＝DA(Km)-FA(Km)，Bm＝DB(Km)-FB(Km)，Cm＝DC(Km)-FC(Km) Obtaining the difference A of each phase voltagem、Bm、CmValue, wherein DA(Km) K being the sampling point of the A phase voltagemValue, DB(Km) K being the sampling point of the B phase voltagemValue, DC(Km) K being the sampling point of the C phase voltagemValue, FA(Km) K being the sampling point of the A' phase voltagemValue, FB(Km) K being the sampling point of the B' phase voltagemValue, FC(Km) K being the sampling point of the C' phase voltagemThe value is obtained.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684169A (en) * | 2012-04-27 | 2012-09-19 | 南京南瑞继保电气有限公司 | Differential protection signal synchronizing method for distribution network system |
| CN104734176A (en) * | 2013-12-23 | 2015-06-24 | 阳光电源股份有限公司 | Island detection method and device |
| CN107255745A (en) * | 2017-06-28 | 2017-10-17 | 华自科技股份有限公司 | Voltage measurement method, device, storage medium and its computer equipment |
| US10139434B1 (en) * | 2018-01-18 | 2018-11-27 | Power Standard Lab Inc. | Method and apparatus for measuring the stability of an alternating current distribution grid |
| CN109307790A (en) * | 2018-10-25 | 2019-02-05 | 中国电力科学研究院有限公司 | A kind of method and system of pair of high pressure three-phase electric energy metering synchronized sampling |
| CN109830989A (en) * | 2019-04-01 | 2019-05-31 | 南通大学 | One kind three-phase voltage phase sequence of micro-capacitance sensor containing new energy detects automatically and combination method |
| CN110048448A (en) * | 2019-03-14 | 2019-07-23 | 江苏大学 | A kind of island detection method based on virtual synchronous generator |
-
2020
- 2020-09-08 CN CN202010932401.6A patent/CN112104004B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684169A (en) * | 2012-04-27 | 2012-09-19 | 南京南瑞继保电气有限公司 | Differential protection signal synchronizing method for distribution network system |
| CN104734176A (en) * | 2013-12-23 | 2015-06-24 | 阳光电源股份有限公司 | Island detection method and device |
| CN107255745A (en) * | 2017-06-28 | 2017-10-17 | 华自科技股份有限公司 | Voltage measurement method, device, storage medium and its computer equipment |
| US10139434B1 (en) * | 2018-01-18 | 2018-11-27 | Power Standard Lab Inc. | Method and apparatus for measuring the stability of an alternating current distribution grid |
| CN109307790A (en) * | 2018-10-25 | 2019-02-05 | 中国电力科学研究院有限公司 | A kind of method and system of pair of high pressure three-phase electric energy metering synchronized sampling |
| CN110048448A (en) * | 2019-03-14 | 2019-07-23 | 江苏大学 | A kind of island detection method based on virtual synchronous generator |
| CN109830989A (en) * | 2019-04-01 | 2019-05-31 | 南通大学 | One kind three-phase voltage phase sequence of micro-capacitance sensor containing new energy detects automatically and combination method |
Non-Patent Citations (1)
| Title |
|---|
| 船舶电站中的微机控制系统;贾秉西;《浙江海洋学院学报(自然科学版)》;19970330(第01期);全文 * |
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