CN113533849B - Anti-disturbance testing method for new energy station frequency modulation device - Google Patents
Anti-disturbance testing method for new energy station frequency modulation device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
Abstract
The invention relates to an anti-disturbance test method for a frequency modulation device of a new energy station, and belongs to the technical field of frequency adjustment of power systems. According to the invention, a set of frequency modulation device is added in the new energy station, so that a station-level primary frequency modulation function is realized; adding frequency signals with specified frequency amplitude and change rate on a bus voltage acquisition board of the frequency modulation device by adopting a frequency signal generator so as to simulate the frequency change of a power grid; and the electric quantity recording analyzer is used for collecting and analyzing the corresponding new energy station voltage and current signals and the frequency signals output by the frequency signal generator, so that the testing on three aspects of frequency disturbance prevention, voltage disturbance prevention and voltage plus frequency disturbance prevention of the frequency modulation device is realized. The testing method can improve the stability of the frequency modulation device of the new energy station, improve the frequency stability of the power grid, improve the dynamic quality of the power system, meet the operation requirement of the new energy station, and promote the friendly and coordinated development of the frequency problem between the new energy and the power grid.
Description
Technical Field
The invention belongs to the technical field of power system frequency adjustment, and particularly relates to an anti-disturbance testing method for a new energy station frequency modulation device.
Background
With large-scale grid connection of wind power and photovoltaic, and inherent defects of a traditional unit, the problem of insufficient frequency modulation capacity is increasingly prominent. With the continuous improvement of the permeability of the photovoltaic power generation, the photovoltaic power generation system occupies part of the conventional unit space, reduces the primary frequency modulation resource reserve capacity of the power grid, weakens the frequency modulation capacity of the power grid, and is urgent to study the participation of a new energy power generation system in the frequency modulation method of the power grid and a corresponding test method for improving the frequency safety level of the power grid.
The national standard GB/T19963-2011 published in 2011, technical provision for wind farm access to electric power system, clearly indicates that: the wind power plant is provided with an active power control system and has active power adjustment capability; the wind farm should be capable of receiving and automatically executing control instructions of active power and changes thereof issued by the power system dispatching mechanism, and the active power and changes thereof of the wind farm should be consistent with given values issued by the power system dispatching mechanism. The enterprise standard Q/CSG 1211017-2018 published in 2018 of the southern power grid is specifically indicated in the technical Specification for wind farm access grid: when the active power of the wind farm is more than 20% of the total rated output, all running units in the farm can realize continuous smooth adjustment of the active power and participate in active power control of the system.
The voltage and frequency problems of the new energy station have serious problems; after the new energy station completes the transformation of the rapid frequency response function, the site-connected point of the station not only verifies whether the station has the rapid frequency response function through the site test, but also needs to test whether the frequency modulation device has the anti-disturbance function.
The primary frequency modulation function is one of basic characteristics of the grid-connected operation generator set, and can effectively inhibit the frequency change of a power grid and improve the capability of the system for resisting power shortage disturbance. However, no clear tamper test standard or test method exists.
The correct action of the frequency modulation function of the new energy station not only refers to the corresponding change of the output of the wind power station when the frequency modulation control system senses the fluctuation of the power grid frequency, but also considers the disturbance locking frequency modulation function in the aspects of power grid voltage, frequency and the like.
Therefore, how to overcome the defects of the prior art is a problem to be solved in the technical field of frequency adjustment of the current power system.
Disclosure of Invention
The invention provides an anti-disturbance test method for a new energy station frequency modulation device, which aims to solve the problem of frequency stability caused by increasing new energy duty ratio in a power grid; the action accuracy, reliability and stability of the frequency modulation system can be improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A new energy station frequency modulation device anti-disturbance test method specifically comprises the following steps:
A set of frequency modulation device is added in the new energy station to realize the station-level primary frequency modulation function;
Adding frequency signals with specified frequency amplitude and change rate on a bus voltage acquisition board of the frequency modulation device by adopting a frequency signal generator so as to simulate the frequency change of a power grid; the electric quantity recording analyzer is used for collecting corresponding new energy station voltage and current signals and frequency signals output by the frequency signal generator and analyzing frequency and total station power response curves, so that the testing on three aspects of frequency disturbance prevention, voltage disturbance prevention and voltage plus frequency disturbance prevention of the frequency modulation device is realized.
Further, preferably, the frequency signal with the specified frequency amplitude and the change rate is a frequency signal with the frequency amplitude of 45-55 Hz and the change rate of-1.0 to +1.0 Hz/s.
Further, it is preferable that the anti-frequency disturbance test is divided into a test of three aspects of frequency variation, frequency variation rate, frequency variation+frequency variation rate disturbance, specifically:
a) Setting a power grid frequency variation and a frequency variation rate dead zone to be +/-0.05 Hz and +/-0.05 Hz/s respectively;
b) Adding a frequency variation through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and enabling the frequency modulation device to act when the frequency variation delta f exceeds a dead zone;
c) Adding a frequency change rate through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and enabling the frequency modulation device to act when the frequency change rate df/dt exceeds a dead zone;
d) And meanwhile, the frequency change quantity and the frequency change rate are added through the frequency signal generator, the electric quantity recording analyzer is used for collecting and analyzing, and when the frequency change quantity delta f exceeds the dead zone and the frequency change rate df/dt exceeds the dead zone, the frequency modulation device can act.
This step pertains to the frequency modulation device setup and accounts for when frequency modulation is active.
Furthermore, it is preferable that the anti-frequency disturbance test also needs to be performed on the frequency variation, the variation rate and the variation quantity disturbance test of the single phase, the two phases and the three phases of the test voltage respectively; in the test, only the frequency change amount, the change rate and the change rate plus the change amount of the three phases are disturbed, and the frequency change amount delta f and the frequency change rate df/dt exceed dead zones, so that the frequency modulation device can act.
Further, it is preferable that the voltage disturbance prevention test is classified into a voltage drop, a voltage rise, a voltage cascading failure, a harmonic, a PT disconnection, a voltage three-phase negative sequence unbalance test, specifically:
a) Respectively carrying out single-phase voltage drop, two-phase voltage drop and three-phase voltage drop anti-disturbance tests;
b) Respectively carrying out single-phase voltage rising, two-phase voltage rising and three-phase voltage rising anti-disturbance tests;
c) Respectively carrying out single-phase voltage cascading failure, two-phase voltage cascading failure and three-phase voltage cascading failure ride-through tests;
d) Respectively carrying out even harmonic voltage, odd harmonic voltage wave and total harmonic distortion standard exceeding tests on single-phase voltage, two-phase voltage and three-phase voltage;
e) PT disconnection tests of single-phase voltage, two-phase voltage and three-phase voltage are respectively carried out;
f) Carrying out a three-phase voltage negative sequence unbalance test;
the fm device was not active in the above test.
Further, it is preferable that, when the voltage drops symmetrically or asymmetrically, rises or fails in series in the voltage disturbance prevention test, the phase shift is completed twice when the voltage drops and recovers, and each phase shift is more than or equal to 60 degrees; and (3) finishing two phase shifts during voltage rising and recovery, wherein each phase shift is more than or equal to 60 degrees.
Further, it is preferable that the voltages of the voltage sag, the voltage rise, and the voltage cascading failure in the voltage disturbance prevention test are divided into:
a) The low voltage drop range of the wind power plant is 20-100% Un; the low voltage drop range of the photovoltaic power station is between 0% Un and 100% Un;
b) The high voltage rising range of the wind power plant and the photovoltaic power station is 100-130% Un;
c) The voltage cascading failure range of the wind power plant is 20-130% Un; the voltage cascading failure range of the photovoltaic power station is between 0% Un and 130% Un.
Further, it is preferable that the anti-voltage+frequency disturbance test is divided into a frequency disturbance test in a voltage range and a frequency disturbance test outside the voltage range, specifically:
a) Setting the frequency modulation action voltage range to be 85-115% Un by the frequency modulation device;
b) The test voltage is in a set voltage range of 85-115% Un, voltage drops or rises, and frequency disturbance occurs during the voltage drops or rises; testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance and three-phase voltage and frequency disturbance respectively;
c) The test voltage is outside a set voltage range of 85-115% Un, voltage drops or rises, and frequency disturbance occurs during the voltage drops or rises; testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance and three-phase voltage and frequency disturbance respectively;
The frequency modulation device can only act when the three-phase frequency variation delta f and the frequency variation df/dt exceed dead zones and the test voltage is within the set voltage range of 85-115% Un.
Compared with the prior art, the invention has the beneficial effects that:
(1) The accuracy, reliability and stability of frequency modulation of the new energy station are improved, and the dynamic quality of the power system is improved.
(2) The frequency modulation capability of the new energy station frequency modulation device can be comprehensively tested, so that the primary frequency modulation system is more perfect in function, and the operation requirement of the new energy station can be met.
(3) The anti-disturbance test method is suitable for anti-disturbance test of the frequency modulation device of the new energy station in all areas, and has good application value and application prospect.
(4) The testing method can be used for forcefully promoting the testing and researching of the primary frequency modulation capability of the grid-connected wind power and photovoltaic power grid, and further guaranteeing and promoting the friendly and coordinated development of the frequency problem between the new energy and the power grid after the large-scale new energy is connected to the power grid.
(5) The new energy installation capacity is gradually increased, so that the available frequency modulation capacity of the system is reduced in proportion, the action reliability of the frequency modulation device of the new energy station is further improved, and the stability of the system can be improved.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a new energy station frequency modulation test wiring provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of anti-disturbance test contents of a new energy station frequency modulation device according to an embodiment of the present invention;
FIG. 3 is a graph of test results for a wind farm according to application example a) of the present invention;
FIG. 4 is a graph of test results for a wind farm in application example b) of the present invention;
FIG. 5 is a graph of test results for a wind farm in application example c) of the present invention;
FIG. 6 is a graph of test results for a wind farm in application example d) of the present invention;
fig. 7 is a graph of test results of a wind farm in application example e) of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the present invention and should not be construed as limiting the scope of the invention. The specific techniques or conditions are not identified in the examples and are performed according to techniques or conditions described in the literature in this field or according to the product specifications. The materials or equipment used are conventional products available from commercial sources, not identified to the manufacturer.
The embodiment of the invention provides an anti-disturbance testing method for a new energy station frequency modulation device, which is used in the field of power system control. Referring to fig. 1 and 2, the anti-disturbance testing method for the new energy station frequency modulation device specifically comprises the following steps:
A set of frequency modulation device is added in the new energy station to realize the station-level primary frequency modulation function;
Adding frequency signals with specified frequency amplitude and change rate on a bus voltage acquisition board of the frequency modulation device by adopting a frequency signal generator so as to simulate the frequency change of a power grid; the electric quantity recording analyzer is used for collecting corresponding new energy station voltage and current signals and frequency signals output by the frequency signal generator and analyzing frequency and total station power response curves, so that the testing on three aspects of frequency disturbance prevention, voltage disturbance prevention and voltage plus frequency disturbance prevention of the frequency modulation device is realized.
Preferably, the frequency signal with the specified frequency amplitude and the change rate is a frequency signal with the frequency amplitude of 45-55 Hz and the change rate of-1.0 to +1.0 Hz/s.
Further, it is preferable that the anti-frequency disturbance test is divided into a test of three aspects of frequency variation, frequency variation rate, frequency variation+frequency variation rate disturbance, specifically:
a) Setting a power grid frequency variation and a frequency variation rate dead zone to be +/-0.05 Hz and +/-0.05 Hz/s respectively;
b) Adding a frequency variation through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and enabling the frequency modulation device to act when the frequency variation delta f exceeds a dead zone;
c) Adding a frequency change rate through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and enabling the frequency modulation device to act when the frequency change rate df/dt exceeds a dead zone;
d) And meanwhile, the frequency change quantity and the frequency change rate are added through the frequency signal generator, the electric quantity recording analyzer is used for collecting and analyzing, and when the frequency change quantity delta f exceeds the dead zone and the frequency change rate df/dt exceeds the dead zone, the frequency modulation device can act.
Preferably, the anti-frequency disturbance test also needs to be carried out on the frequency variation, the variation rate and the variation rate plus variation quantity disturbance test of the single phase, the two phases and the three phases of the test voltage respectively; in the test, only the frequency change amount, the change rate and the change rate plus the change amount of the three phases are disturbed, and the frequency change amount delta f and the frequency change rate df/dt exceed dead zones, so that the frequency modulation device can act.
Preferably, the voltage disturbance prevention test is divided into voltage drop, voltage rise, voltage cascading failure, harmonic wave, PT wire breakage and voltage three-phase negative sequence unbalance test, and specifically comprises the following steps:
a) Respectively carrying out single-phase voltage drop, two-phase voltage drop and three-phase voltage drop anti-disturbance tests;
b) Respectively carrying out single-phase voltage rising, two-phase voltage rising and three-phase voltage rising anti-disturbance tests;
c) Respectively carrying out single-phase voltage cascading failure, two-phase voltage cascading failure and three-phase voltage cascading failure ride-through tests;
d) Respectively carrying out even harmonic voltage, odd harmonic voltage wave and total harmonic distortion standard exceeding tests on single-phase voltage, two-phase voltage and three-phase voltage;
e) PT disconnection tests of single-phase voltage, two-phase voltage and three-phase voltage are respectively carried out;
f) Carrying out a three-phase voltage negative sequence unbalance test;
the fm device was not active in the above test.
Preferably, when voltage is dropped, raised or cascade faults, which are symmetrical or asymmetrical, in the voltage disturbance prevention test, two phase shifts are completed when the voltage is dropped and recovered, and each phase shift is more than or equal to 60 degrees; and (3) finishing two phase shifts during voltage rising and recovery, wherein each phase shift is more than or equal to 60 degrees.
Preferably, the voltages of the voltage drop, the voltage rise and the voltage cascading failure in the voltage disturbance prevention test are divided into:
a) The low voltage drop range of the wind power plant is 20-100% Un; the low voltage drop range of the photovoltaic power station is between 0% Un and 100% Un;
b) The high voltage rising range of the wind power plant and the photovoltaic power station is 100-130% Un;
c) The voltage cascading failure range of the wind power plant is 20-130% Un; the voltage cascading failure range of the photovoltaic power station is between 0% Un and 130% Un.
Specifically, the anti-voltage+frequency disturbance test is divided into frequency disturbance in a voltage range and frequency disturbance outside the voltage range, wherein the anti-voltage+frequency disturbance test specifically comprises the following steps:
a) Setting a certain frequency modulation action voltage range by the frequency modulation device;
b) The test voltage drops or rises within a set voltage range, and the frequency is disturbed during the voltage drop or rise; if the primary frequency modulation action is performed, the anti-disturbance function of the frequency modulation device is correct;
c) The test voltage drops or rises outside the set voltage range, and the frequency is disturbed during the voltage drop or rise; if the primary frequency modulation action is performed, the disturbance prevention function of the frequency modulation device is incorrect.
D) Testing is performed under the conditions of single-phase voltage, two-phase voltage, three-phase voltage, single-phase frequency, two-phase frequency and three-phase frequency disturbance.
Preferably, the anti-voltage+frequency disturbance test is divided into a frequency disturbance test in a voltage range and a frequency disturbance test outside the voltage range, and specifically comprises the following steps:
a) Setting the frequency modulation action voltage range to be 85-115% Un by the frequency modulation device;
b) The test voltage is in a set voltage range of 85-115% Un, voltage drops or rises, and frequency disturbance occurs during the voltage drops or rises; testing was performed with single phase voltage and frequency disturbances, two phase voltage and frequency disturbances, three phase voltage and frequency disturbances, respectively.
C) The test voltage is outside a set voltage range of 85-115% Un, voltage drops or rises, and frequency disturbance occurs during the voltage drops or rises; testing was performed with single phase voltage and frequency disturbances, two phase voltage and frequency disturbances, three phase voltage and frequency disturbances, respectively.
The frequency modulation device can only act when the three-phase frequency variation delta f and the frequency variation df/dt exceed dead zones and the test voltage is within the set voltage range of 85-115% Un.
According to the invention, a set of frequency modulation device system is added in the new energy station, a station-level primary frequency modulation function is realized by modifying a communication network and a new energy generator set, and an anti-disturbance function of the frequency modulation device is realized, and the new energy station frequency modulation device has the functions of preventing frequency disturbance, voltage plus frequency disturbance and the like.
Application instance
A new energy station frequency modulation device anti-disturbance test method comprises the following steps:
a) Adding three-phase 81% Un voltage on a bus voltage acquisition board of a frequency modulation device of a wind power plant by utilizing a high-precision frequency signal generator, and completing twice phase shift when the voltage drops and recovers, wherein each phase shift is 60 degrees, and the frequency modulation device does not act as seen from active power in FIG. 3, so that the anti-disturbance function of the frequency modulation device is correct;
b) Adding a three-phase 81% Un voltage on a bus voltage acquisition board of a frequency modulation device of a wind power plant by utilizing a high-precision frequency signal generator, wherein the frequency is 50.15Hz in a voltage drop period, and the frequency modulation device acts as shown by active power in FIG. 4, so that the anti-disturbance function of the frequency modulation device is correct;
c) The high-precision frequency signal generator is utilized to add three-phase 79% Un voltage on a bus voltage acquisition board of a frequency modulation device of a wind power plant, the frequency is 50.15Hz in the voltage drop period, and the frequency modulation device acts as shown by active power in FIG. 5, so that the anti-disturbance function of the frequency modulation device is correct.
D) The BC phase rated voltage and the A phase 79% Un voltage are added on a bus voltage acquisition board of a frequency modulation device of a certain wind power plant by utilizing a high-precision frequency signal generator, and the frequency is 50.15Hz in the voltage drop period, and as shown in the active power in FIG. 6, the frequency modulation device does not act, so that the anti-disturbance function of the frequency modulation device is correct.
E) The C-phase rated voltage and the AB-phase 79% Un voltage are added on a bus voltage acquisition board of a frequency modulation device of a certain wind power plant by utilizing a high-precision frequency signal generator, and the frequency is 50.15Hz in the voltage drop period, and as shown in active power in FIG. 7, the frequency modulation device does not act, so that the anti-disturbance function of the frequency modulation device is correct.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A new energy station frequency modulation device anti-disturbance test method is characterized in that:
A set of frequency modulation device is added in the new energy station to realize the station-level primary frequency modulation function;
Adding frequency signals with specified frequency amplitude and change rate on a bus voltage acquisition board of the frequency modulation device by adopting a frequency signal generator so as to simulate the frequency change of a power grid; the electric quantity recording analyzer is used for acquiring corresponding new energy station voltage and current signals and frequency signals output by the frequency signal generator and analyzing frequency and total station power response curves, so that the testing on three aspects of frequency disturbance prevention, voltage disturbance prevention and voltage plus frequency disturbance prevention of the frequency modulation device is realized;
the voltage disturbance prevention test is divided into voltage drop, voltage rise, voltage cascading failure, harmonic wave, PT disconnection and voltage three-phase negative sequence unbalance test, and specifically comprises the following steps:
a) Respectively carrying out single-phase voltage drop, two-phase voltage drop and three-phase voltage drop anti-disturbance tests;
b) Respectively carrying out single-phase voltage rising, two-phase voltage rising and three-phase voltage rising anti-disturbance tests;
c) Respectively carrying out single-phase voltage cascading failure, two-phase voltage cascading failure and three-phase voltage cascading failure ride-through tests;
d) Respectively carrying out even harmonic voltage, odd harmonic voltage wave and total harmonic distortion standard exceeding tests on single-phase voltage, two-phase voltage and three-phase voltage;
e) PT disconnection tests of single-phase voltage, two-phase voltage and three-phase voltage are respectively carried out;
f) Carrying out a three-phase voltage negative sequence unbalance test;
The frequency modulation device can not act in the test;
When voltage is dropped, raised or cascade faults, which are symmetrical or asymmetrical, in the voltage disturbance prevention test, two phase shifts are completed when the voltage drops and recovers, and each phase shift is more than or equal to 60 degrees; the phase shift is completed twice during the voltage rising and recovering, and each phase shift is more than or equal to 60 degrees;
the voltage of voltage drop, voltage rise and voltage cascading failure in the voltage disturbance prevention test is divided into:
a) The low voltage drop range of the wind power plant is 20-100% Un; the low voltage drop range of the photovoltaic power station is between 0% Un and 100% Un;
b) The high voltage rising range of the wind power plant and the photovoltaic power station is 100-130% Un;
c) The voltage cascading failure range of the wind power plant is 20-130% Un; the voltage cascading failure range of the photovoltaic power station is between 0% Un and 130% Un;
the voltage and frequency disturbance prevention test is divided into a frequency disturbance test in a voltage range and a frequency disturbance test outside the voltage range, and specifically comprises the following steps:
a) Setting the frequency modulation action voltage range to be 85-115% Un by the frequency modulation device;
b) The test voltage is in a set voltage range of 85-115% Un, voltage drops or rises, and frequency disturbance occurs during the voltage drops or rises; testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance and three-phase voltage and frequency disturbance respectively;
c) The test voltage is outside a set voltage range of 85-115% Un, voltage drops or rises, and frequency disturbance occurs during the voltage drops or rises; testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance and three-phase voltage and frequency disturbance respectively;
The frequency modulation device can only act when the three-phase frequency variation delta f and the frequency variation df/dt exceed dead zones and the test voltage is within the set voltage range of 85-115% Un.
2. The anti-disturbance testing method for the frequency modulation device of the new energy station according to claim 1, wherein the method comprises the following steps: the frequency signal with the designated frequency amplitude and the change rate is a frequency signal with the frequency amplitude of 45-55 Hz and the change rate of-1.0 to +1.0 Hz/s.
3. The anti-disturbance testing method for the frequency modulation device of the new energy station according to claim 1, wherein the method comprises the following steps: the anti-frequency disturbance test is divided into three tests of frequency variation, frequency variation rate, frequency variation plus frequency variation rate disturbance, and specifically comprises the following steps:
a) Setting a power grid frequency variation and a frequency variation rate dead zone to be +/-0.05 Hz and +/-0.05 Hz/s respectively;
b) Adding a frequency variation through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and enabling the frequency modulation device to act when the frequency variation delta f exceeds a dead zone;
c) Adding a frequency change rate through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and enabling the frequency modulation device to act when the frequency change rate df/dt exceeds a dead zone;
d) And meanwhile, the frequency change quantity and the frequency change rate are added through the frequency signal generator, the electric quantity recording analyzer is used for collecting and analyzing, and when the frequency change quantity delta f exceeds the dead zone and the frequency change rate df/dt exceeds the dead zone, the frequency modulation device can act.
4. The new energy station frequency modulation device anti-disturbance testing method according to claim 3, wherein the method comprises the following steps: the anti-frequency disturbance test also needs to respectively develop the frequency variation, the variation rate and the variation rate plus variation quantity disturbance tests of the single phase, the two phases and the three phases of the test voltage; in the test, only the frequency change amount, the change rate and the change rate plus the change amount of the three phases are disturbed, and the frequency change amount delta f and the frequency change rate df/dt exceed dead zones, so that the frequency modulation device can act.
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