CN113541185B - Dq conversion wind power converter grid voltage fault detection method - Google Patents
Dq conversion wind power converter grid voltage fault detection method Download PDFInfo
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- CN113541185B CN113541185B CN202110707022.1A CN202110707022A CN113541185B CN 113541185 B CN113541185 B CN 113541185B CN 202110707022 A CN202110707022 A CN 202110707022A CN 113541185 B CN113541185 B CN 113541185B
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- 238000001514 detection method Methods 0.000 title abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 34
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- 230000010354 integration Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 3
- 230000003068 static effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000009466 transformation Effects 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- 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
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention provides a dq conversion wind power converter grid voltage fault detection method, which comprises the following steps: conversion: the three-phase voltage u under the three-phase static coordinate system a 、u b 、u c Converted into voltage u under two-phase rotation coordinate system d 、u q The method comprises the steps of carrying out a first treatment on the surface of the Delay signal cancellation: the voltage u under the two-phase rotation coordinate system q Performing delay processing and obtaining positive sequence components on d axis and q axis of two-phase rotation coordinate systemAndthe voltage fault detection method for the dq-transformed wind power converter power grid can detect the change of the voltage amplitude in extremely short time, so that the method is very suitable for offshore wind power low-voltage ride-through application occasions with high requirements on timeliness.
Description
Technical Field
The invention belongs to the field of electric power, and particularly relates to a novel dq conversion wind power converter grid voltage fault detection method.
Background
Offshore fans are more and more distant, the power generation capacity is more and more large, and the way in which the high voltage direct current transmission (High Voltage Direct Current, HVDC) is connected to the grid is becoming a better choice. When HVDC is adopted, the wind driven generator and the alternating current power grid are decoupled from each other due to direct current lines, when faults occur in the power grid, the direct current bus voltage rises, and when the faults occur seriously, the wind power plant can be stopped for protection. Therefore, a means must be used to enable the HVDC power transmission line to traverse the grid side fault, i.e. when the grid fails, the wind farm needs to be maintained connected to the grid for a period of time without disconnection, even requiring that the wind farm can provide reactive power in the process to support the restoration of the grid voltage, i.e. the low voltage ride through, which is a problem of low voltage ride through (Low Voltage Ride Through, LVRT) of offshore wind power soft direct into the power system. The primary premise of realizing the LVRT of the wind power plant and the blower is to rapidly and accurately detect the voltage amplitude faults of the power grid.
Disclosure of Invention
Aiming at the problems, the invention provides a method for detecting the voltage faults of a power grid of a dq conversion wind power converter.
The invention relates to a dq conversion wind power converter grid voltage fault detection method, which comprises the following steps:
conversion: the three-phase voltage u under the three-phase static coordinate system a 、u b 、u c Converted into voltage u under two-phase rotation coordinate system d 、u q ；
Delay signal cancellation: the voltage u under the two-phase rotation coordinate system q Delay processing is carried out, and positive sequence components on d axis and q axis of a two-phase rotation coordinate system are obtained and />
Further, the method comprises the steps of,
voltage u in the two-phase rotating coordinate system d 、u q The method meets the following conditions:
wherein ,Au ，B u The voltage amplitude of the three-phase power grid is represented by t, the time is represented by t, and the working frequency of the three-phase voltage is represented by omega.
Further, the method comprises the steps of,
said bringing the voltage u in the two-phase rotating coordinate system q The time delay processing is as follows:
wherein ,
t is the period of the voltage base wave of the three-phase voltage.
Further, the method comprises the steps of,
positive sequence components on d-axis and q-axis of the two-phase rotating coordinate system and />Satisfy the following requirements
Further, the method comprises the steps of,
for positive sequence components on d-axis and q-axis of the two-phase rotating coordinate system and />PI control and integration are performed.
Further, the method comprises the steps of,
the integration is performed by an integrating circuit.
Further, the method comprises the steps of,
positive sequence components on d-axis and q-axis from the two-phase rotating coordinate system and />And detecting a dip in the voltage amplitude of the three-phase voltage of the power grid.
The voltage fault detection method for the dq-transformed wind power converter power grid can detect the change of the voltage amplitude in extremely short time, so that the method is very suitable for offshore wind power low-voltage ride-through application occasions with high requirements on timeliness.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 illustrates a phase-locked loop with a time delay T/8 in accordance with an embodiment of the present invention;
FIG. 2 illustrates a delay signal cancellation unit in a phase locked loop with a time delay T/8 in accordance with an embodiment of the present invention;
FIG. 3 shows a three-phase voltage sag schematic of a power grid according to an embodiment of the invention;
FIG. 4 shows a three-phase voltage drop of a power grid according to an embodiment of the inventionA variation schematic;
fig. 5 shows a schematic diagram of a grid a-phase voltage dip in accordance with an embodiment of the invention;
FIG. 6 shows a power grid a-phase voltage sag in accordance with an embodiment of the present inventionA variation schematic;
FIG. 7 shows the positive sequence component on the d-axis according to an embodiment of the inventionA schematic diagram of detection speed comparison;
FIG. 8 shows the positive sequence component on the q-axis according to an embodiment of the inventionSchematic diagram of detection speed comparison.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
See fig. 1 and 2. The method for detecting the voltage faults of the power grid of the dq conversion wind power converter is as follows.
When the voltage of the power grid is unbalanced, the voltages of two phases are always the same no matter single-phase grounding faults or two-phase short-circuit faults occur. Thus, the three-phase grid voltage at which the asymmetrical fault occurs is expressed as
In the formula (1), u a ，u b ，u c Three-phase voltages of a three-phase power grid respectively, omega is the working frequency of the three-phase voltages, A u ，B u The voltage amplitude of the three-phase power grid is represented by t, and the time is represented by t.
Fig. 1 shows a phase locked loop with a time delay T/8. As shown in FIG. 1, the three-phase voltage u in the three-phase stationary coordinate system can be obtained by Clark (Clark) transformation and Park (Park) transformation a 、u b 、u c Converted into voltage u under two-phase rotation coordinate system d 、u q The conversion is achieved by the following dq transformation process:
in the formula (2), the amino acid sequence of the compound,
in the expression (3), θ is a coordinate rotation angle.
Calculate the available voltage u d 、u q Is that
U is oriented by ωt- θ=pi/2 d and uq Respectively is
And then u is set q Performing Delayed Signal cancellation (Delayed Signal)Cancel, DSC) processing, specifically, as shown in FIG. 2, the DSC unit in the phase-locked loop of time delay T/8 is a unit of u q Respectively delaying for one eighth and one fourth of the period to obtain
Wherein T is the period of the voltage base wave. The positive sequence components on the d axis and the q axis are obtained after operation:
thus, u can be eliminated by integrating the time delay, the positive sequence component calculation, the PI control and the integrating circuit 1/s d and uq By a double frequency component in the d-axis and q-axisAnd accurately detecting the change of the voltage amplitude of the power grid.
Simulation is carried out by setting up a simulation model in MATLAB/Simulink, and when the three-phase or single-phase voltage of the power grid falls to 10% of the original voltage, the simulation result of the time delay T/8 method is shown in figures 3-6.
Fig. 3 shows a three-phase voltage drop schematic of the power grid. As can be seen from fig. 3, the three-phase voltage U of the power grid a ，U b and Uc (i.e., u in formula (1) a ，u b ，u c ) The amplitude of (2) falls to 10% of the original at 0.04 s. Fig. 4 is a three-phase voltage U corresponding to the power grid of fig. 3 a ，U b and Uc Positive sequence components on d-axis and q-axis at amplitude dips of (a)In the power grid, i.e. fig. 4 shows the three-phase voltage U corresponding to fig. 3 obtained by the time delay T/8 method a ，U b and Uc Positive sequence component +.> How it changes over time. D-axis positive sequence component +.>Drop is evident at 0.04s, so that the d-axis positive sequence component can be taken up by the time delay T/8 method>The dip of the voltage amplitude of the three-phase voltage of the power grid is accurately detected.
FIG. 5 shows a phase voltage U of the power grid a FIG. 6 is a schematic drop diagram showing a phase voltage U of the power grid corresponding to FIG. 5 a (i.e., u in formula (1) a ) Positive sequence components on d-axis and q-axis at dropIs a variation of the method, showing that the time delay T/8 method corresponds to the detected power grid a-phase voltage U of FIG. 5 a Positive sequence component +.>How it changes over time. In fig. 5, the grid a-phase voltage drops to 10% of the original at 0.04 s. Positive sequence component on d-axis and q-axis in FIG. 6 +.> Has obvious change in 0.04s, < >>Obvious drop, u q The fall from 0 is significant but quickly returns to 0, so that the fall can be made from +.> and />The dip of the voltage amplitude of the a-phase voltage of the power grid is accurately detected.
Fig. 3 and fig. 4 show the working conditions of symmetrical voltage amplitude faults, namely three-phase voltages are symmetrical after the voltage of the power grid drops. Fig. 5 and 6 show the working conditions of asymmetrical voltage amplitude faults, namely, three-phase voltages are asymmetrical after the voltage of the power grid drops. As can be seen from fig. 3 to fig. 6, the voltage fault detection method of the dq-transformed wind power converter of the present invention can rapidly and accurately detect the dip of the voltage amplitude no matter the symmetrical or asymmetrical voltage amplitude faults occur in the power grid.
FIG. 7 shows the positive sequence component on the d-axisFIG. 8 shows the positive sequence component +.>Schematic diagram of detection speed comparison. Specifically, fig. 7 and 8 are results shown in fig. 7 and 8, which are obtained by comparing the detection results of the dq-transformed wind power converter grid voltage fault detection method of the present invention with the detection results of the DSC method, double Second-order generalized integral (DSOGI) method, and adaptive notch filter (Adaptive Notch Filter, ANF) method conventionally applied to the αβ axis. In fig. 7 and 8, a and A1 represent detection results of the dq-transformed wind power converter grid voltage fault detection method of the present invention, B and B1 represent detection results of the DSC method conventionally applied to the αβ axis, C and C1 represent detection results of the adaptive notch filter method, and D1 represent detection results of the biquad generalized integral method. In the dq conversion wind power converter grid voltage fault detection method of the invention, the positive sequence component on the d axisPositive sequence component +.>For phase synchronization. As can be seen from fig. 7 and fig. 8, the voltage fault detection method of the dq-transformed wind power converter of the present invention performs a time delay of two eighth cycles on the q-axis component after coordinate transformation, and only 2.5ms is needed to detect the change of the voltage amplitude of the power grid, and the detection speed is fast and the other three methods are provided.
The method is based on the idea of DSC, applying DSC units to the dq coordinate system. By the method of u q Is used for eliminating u when the voltage of the power grid is unbalanced d and uq The alternating current component with the frequency twice that of the fundamental wave can detect the change of the voltage amplitude in extremely short time, so that the method is very suitable for the application occasion of low-voltage ride through of the offshore wind power with higher requirement on timeliness.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. The method comprises the following steps ofdqThe method for detecting the voltage faults of the transformed wind power converter power grid is characterized by comprising the following steps of:
when the power grid voltage is unbalanced, no matter a single-phase earth fault or a two-phase short circuit fault occurs, the voltages of two phases are the same, and the voltage of the three-phase power grid with the asymmetric fault is expressed as:
in the formula,u a ，u b ，u c respectively three phasesThe three-phase voltage of the power grid,ωis the operating frequency of the three-phase voltage,A u ，B u for the voltage amplitude of the three-phase network,ttime is;
conversion: three-phase voltages in a three-phase stationary coordinate systemu a 、u b 、u c Converted into voltages in a two-phase rotating coordinate systemu d 、u q ；
Delay signal cancellation: voltage under the two-phase rotation coordinate systemu q Delay processing is carried out, and a two-phase rotation coordinate system is obtaineddShaft and method for producing the sameqPositive sequence component on axis and />；
Voltage under the two-phase rotation coordinate systemu d 、u q The method meets the following conditions:
，
wherein ,A u ，B u for the voltage amplitude of the three-phase network,tin order to be able to take time,ωthe working frequency of the three-phase voltage;
said applying voltages in said two-phase rotating coordinate systemu q The time delay processing is as follows:
，
wherein ,
t is the period of the voltage base wave of the three-phase voltage;
the two-phase rotation coordinate systemdShaft and method for producing the sameqPositive sequence component on axis and />Satisfy the following requirements
；
For the two-phase rotating coordinate systemdShaft and method for producing the sameqPositive sequence component on axis and />PI control and integration are performed;
the integration is performed by an integrating circuit;
dpositive sequence component on axisThe method is used for detecting the voltage amplitude of the power grid,qpositive sequence component on the axis->For phase synchronization;
and detecting voltage amplitude dip of the three-phase voltage of the power grid from the change of the positive sequence component by a time delay method.
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| CN110165706A (en) * | 2019-05-30 | 2019-08-23 | 辽宁工程技术大学 | A kind of adaptive three-phase grid converter phaselocked loop and its locking phase control method |
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| CN112952865A (en) * | 2021-02-05 | 2021-06-11 | 艾伏新能源科技(上海)股份有限公司 | Three-phase unbalance drop and phase jump detection method |
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| CN110165706A (en) * | 2019-05-30 | 2019-08-23 | 辽宁工程技术大学 | A kind of adaptive three-phase grid converter phaselocked loop and its locking phase control method |
| CN112014684A (en) * | 2020-08-12 | 2020-12-01 | 艾伏新能源科技(上海)股份有限公司 | High-precision detection method for three-phase voltage unbalance drop fault and phase jump fault |
| CN112952865A (en) * | 2021-02-05 | 2021-06-11 | 艾伏新能源科技(上海)股份有限公司 | Three-phase unbalance drop and phase jump detection method |
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