CN113533849A - New energy station frequency modulation device anti-disturbance testing method - Google Patents
New energy station frequency modulation device anti-disturbance testing method Download PDFInfo
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Abstract
The invention relates to a disturbance-prevention testing 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 to realize the station-level primary frequency modulation function; adding a frequency signal with specified frequency amplitude and change rate to a bus voltage acquisition board of a frequency modulation device by using a frequency signal generator so as to simulate the frequency change of a power grid; the electricity quantity recording analyzer collects corresponding voltage and current signals of the new energy station and frequency signals output by the frequency signal generator and analyzes the signals, so that the frequency modulation device is tested in three aspects of frequency disturbance prevention, voltage and frequency disturbance prevention. 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 a disturbance-prevention testing method for a frequency modulation device of a new energy station.
Background
With the large-scale grid connection of wind power and photovoltaic and the inherent defects of the traditional units, the problem of insufficient frequency modulation capacity is increasingly prominent. With the continuous improvement of the photovoltaic power generation permeability, part of the space of the conventional unit is occupied, the primary frequency modulation resource reserve capacity of the power grid is reduced, the frequency modulation capability of the power grid is weakened, and in order to improve the frequency safety level of the power grid, a method for a new energy power generation system to participate in the frequency modulation of the power grid and a corresponding test method are urgently needed to be researched.
The national standard GB/T19963 issued in 2011 in China plus 2011 technical Specification for accessing to electric power system by wind farm clearly indicates that: an active power control system is configured in the wind power plant, and the wind power plant has active power regulation capacity; the wind power plant should receive and automatically execute the control command of the active power and the change thereof issued by the electric power system dispatching mechanism, and the active power and the change thereof of the wind power plant should be consistent with the given value issued by the electric power system dispatching mechanism. The enterprise standard Q/CSG 1211017 issued by the southern power grid in 2018 plus 2018 technical Specification for accessing the wind power plant to the power grid explicitly indicates that: when the active power of the wind power plant is more than 20% of the total rated output, all running units in the plant can realize continuous smooth regulation of the active power and can 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, whether the station grid-connected point has the rapid frequency response function or not is verified through a field test, and whether a frequency modulation device has the anti-disturbance function or not needs to be tested.
The primary frequency modulation function is one of basic characteristics of a grid-connected operation generator set, and can effectively restrain the frequency change of a power grid and improve the capacity of a system for resisting power shortage disturbance. However, no clear anti-disturbance test standard or test method exists at present.
The correct action of the frequency modulation function of the new energy station not only means that when the frequency modulation control system senses the frequency fluctuation of the power grid, the output of the wind power plant correspondingly changes, but also takes the disturbance locking frequency modulation function of the aspects of the voltage, the frequency and the like of the power grid into consideration.
Therefore, how to overcome the defects of the prior art is a problem to be solved urgently in the technical field of the frequency adjustment of the power system at present.
Disclosure of Invention
The invention provides a disturbance-prevention testing method for a frequency modulation device of a new energy station, which aims to solve the problem of frequency stability caused by the increasing occupation ratio of new energy in a power grid; the action accuracy, reliability and stability of the frequency modulation system can be improved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a disturbance prevention test method for a frequency modulation device of a new energy station 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 a frequency signal with specified frequency amplitude and change rate to a bus voltage acquisition board of a frequency modulation device by using a frequency signal generator so as to simulate the frequency change of a power grid; the electricity quantity recording analyzer is used for acquiring corresponding voltage and current signals of the new energy station and frequency signals output by the frequency signal generator, and analyzing frequency and total station power response curves, so that the frequency modulation device is tested in three aspects of frequency disturbance prevention, voltage disturbance prevention and voltage and frequency disturbance prevention.
Further, preferably, the frequency signal with the specified frequency amplitude and change rate is a frequency signal with a frequency amplitude of 45 to 55Hz and a change rate of-1.0 to +1.0 Hz/s.
Further, preferably, the frequency disturbance prevention test is divided into three tests 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 as +/-0.05 Hz and +/-0.05 Hz/s respectively;
b) adding frequency variation through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and obtaining the frequency variation deltafWhen the dead zone is exceeded, the frequency modulation device can act;
c) adding frequency change rate through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and obtaining the frequency change rate dfWhen the/dt exceeds the dead zone, the frequency modulation device can act;
d) adding frequency variation and frequency variation rate by a frequency signal generator, and collecting and analyzing by an electric quantity recording analyzer, wherein when the frequency variation delta isfOver dead band and rate of change of frequency dfThe frequency modulation device can act only when the/dt exceeds the dead zone.
This step belongs to the frequency modulation device setting and explains when frequency modulation is active.
Further, preferably, the frequency disturbance prevention test also needs to be performed for testing the frequency variation, the variation rate + the variation disturbance of the single phase, the two phase and the three phase of the voltage respectively; in the above test, only the frequency variation, the rate of change + the variation disturbance of the three phases, and the frequency variation ΔfAnd the frequency change rate dfThe frequency modulation device can act only when the/dt exceeds the dead zone.
Further, it is preferable that the voltage disturbance prevention test is divided into a voltage drop test, a voltage rise test, a voltage cascading failure test, a harmonic test, a PT disconnection test, and a voltage three-phase negative sequence imbalance test, and specifically:
a) respectively carrying out single-phase voltage drop, two-phase voltage drop and three-phase voltage drop disturbance prevention tests;
b) respectively carrying out single-phase voltage rise, two-phase voltage rise and three-phase voltage rise 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 testing the even harmonic voltage, the odd harmonic voltage wave and the total harmonic distortion exceeding of the single-phase voltage, the two-phase voltage and the three-phase voltage;
e) respectively carrying out PT disconnection tests of single-phase voltage, two-phase voltage and three-phase voltage;
f) carrying out a three-phase voltage negative sequence unbalance test;
none of the frequency tuning devices were able to operate in the above tests.
Further, preferably, when the voltage is symmetrically or asymmetrically dropped, raised or linked in the voltage disturbance test, two phase shifts are completed during voltage dropping and recovery, and each phase shift is more than or equal to 60 degrees; two phase shifts are accomplished at voltage rise and recovery, each phase shift being ≧ 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 rise range of the wind power plant and the photovoltaic power plant 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 0% -130% Un.
Further, preferably, the voltage and frequency disturbance prevention test is divided into a voltage range internal frequency disturbance test and a voltage range external frequency disturbance test, and specifically includes:
a) setting a frequency modulation action voltage range to be 85% Un-115% Un by the frequency modulation device;
b) the voltage drop or rise of the test voltage is within a set voltage range of 85% Un-115% Un, and the frequency is disturbed during the voltage drop or rise; respectively testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance, and three-phase voltage and frequency disturbance;
c) the voltage drop or rise and the frequency disturbance during the voltage drop or rise are carried out when the test voltage is outside the set voltage range of 85% Un-115% Un; respectively testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance, and three-phase voltage and frequency disturbance;
variation in three-phase frequency only ΔfAnd the frequency change rate dfThe/dt exceeds the dead zone, and the frequency modulation device can only act when the test voltage is within the set voltage range of 85% Un-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 frequency modulation device of the new energy station can be comprehensively tested, so that the function of a primary frequency modulation system is more perfect, and the operation requirement of the new energy station can be met.
(3) The method is suitable for the disturbance-prevention 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 forcefully promote the testing and research work of the primary frequency modulation capability of the grid-connected wind power and photovoltaic power grids, and can further guarantee and promote the friendly and coordinated development of the frequency problem between the new energy and the power grids after the large-scale new energy is connected into the power grids.
(5) The installed capacity of the new energy is gradually increased, so that the available frequency modulation capacity ratio of the system is reduced, the action reliability of a 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 explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic diagram of a new energy station frequency modulation test connection provided in an embodiment of the present invention;
fig. 2 is a schematic view of the anti-disturbance test content of the frequency modulation device of the new energy station according to the embodiment of the present invention;
FIG. 3 is a graph showing the test results of a wind farm according to application example a) of the present invention;
FIG. 4 is a graph showing the test results of a wind farm according to application example b) of the present invention;
FIG. 5 is a graph of the test results of 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 diagram showing the test results of a wind farm in 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 invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
The embodiment of the invention provides a disturbance-prevention testing method for a frequency modulation device of a new energy station, which is used for the field of power system control. Referring to fig. 1 and 2, the method for testing disturbance prevention of the frequency modulation device of the new energy station specifically includes:
a set of frequency modulation device is added in the new energy station to realize the station-level primary frequency modulation function;
adding a frequency signal with specified frequency amplitude and change rate to a bus voltage acquisition board of a frequency modulation device by using a frequency signal generator so as to simulate the frequency change of a power grid; the electricity quantity recording analyzer is used for acquiring corresponding voltage and current signals of the new energy station and frequency signals output by the frequency signal generator, and analyzing frequency and total station power response curves, so that the frequency modulation device is tested in three aspects of frequency disturbance prevention, voltage disturbance prevention and voltage and frequency disturbance prevention.
Preferably, the frequency signal with the specified frequency amplitude and change rate is a frequency signal with a frequency amplitude of 45-55 Hz and a change rate of-1.0 to +1.0 Hz/s.
Further, preferably, the frequency disturbance prevention test is divided into three tests 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 as +/-0.05 Hz and +/-0.05 Hz/s respectively;
b) adding frequency variation through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and obtaining the frequency variation deltafWhen the dead zone is exceeded, the frequency modulation device can act;
c) adding frequency change rate through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and obtaining the frequency change rate dfWhen the/dt exceeds the dead zone, the frequency modulation device can act;
d) adding frequency variation and frequency variation rate by a frequency signal generator, and collecting and analyzing by an electric quantity recording analyzer, wherein when the frequency variation delta isfOver dead band and rate of change of frequency dfThe frequency modulation device can act only when the/dt exceeds the dead zone.
Preferably, the frequency disturbance prevention test also needs to respectively carry out frequency variation, change rate + change quantity disturbance tests of single-phase, two-phase and three-phase test voltages; in the above test, only the frequency variation, the rate of change + the variation disturbance of the three phases, and the frequency variation ΔfAnd the frequency change rate dfThe frequency modulation device can act only when the/dt exceeds the dead zone.
Preferably, 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 disturbance prevention tests;
b) respectively carrying out single-phase voltage rise, two-phase voltage rise and three-phase voltage rise 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 testing the even harmonic voltage, the odd harmonic voltage wave and the total harmonic distortion exceeding of the single-phase voltage, the two-phase voltage and the three-phase voltage;
e) respectively carrying out PT disconnection tests of single-phase voltage, two-phase voltage and three-phase voltage;
f) carrying out a three-phase voltage negative sequence unbalance test;
none of the frequency tuning devices were able to operate in the above tests.
Preferably, when the voltage is symmetrically or asymmetrically dropped, raised or linked in the voltage disturbance test, two phase shifts are completed during voltage dropping and recovery, and each phase shift is more than or equal to 60 degrees; two phase shifts are accomplished at voltage rise and recovery, each phase shift being ≧ 60 degrees.
Preferably, the voltages for preventing voltage drop, voltage rise and voltage cascading failure in the voltage disturbance 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 rise range of the wind power plant and the photovoltaic power plant 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 0% -130% Un.
Specifically, the voltage and frequency disturbance prevention test is divided into frequency disturbance within a voltage range and frequency disturbance outside the voltage range, wherein the specific steps are as follows:
a) setting a certain frequency modulation action voltage range by the frequency modulation device;
b) the test voltage falls or rises within a set voltage range, and the frequency is disturbed during the voltage falling or rising; if the frequency modulation is carried out for the first time, the anti-disturbance function of the frequency modulation device is correct;
c) dropping or rising the test voltage outside a set voltage range, and frequency disturbance during the dropping or rising of the test voltage; if the frequency modulation is performed for one time, the disturbance prevention function of the frequency modulation device is incorrect.
d) And respectively carrying out tests 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 voltage and frequency disturbance prevention test is divided into a voltage range internal frequency disturbance test and a voltage range external frequency disturbance test, and specifically comprises the following steps:
a) setting a frequency modulation action voltage range to be 85% Un-115% Un by the frequency modulation device;
b) the voltage drop or rise of the test voltage is within a set voltage range of 85% Un-115% Un, and the frequency is disturbed during the voltage drop or rise; and respectively testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance and three-phase voltage and frequency disturbance.
c) The voltage drop or rise and the frequency disturbance during the voltage drop or rise are carried out when the test voltage is outside the set voltage range of 85% Un-115% Un; and respectively testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance and three-phase voltage and frequency disturbance.
Variation in three-phase frequency only ΔfAnd the frequency change rate dfThe/dt exceeds the dead zone, and the frequency modulation device can only act when the test voltage is within the set voltage range of 85% Un-115% Un.
The frequency modulation device system is added in the new energy station, the station-level primary frequency modulation function is realized by modifying a communication network and a new energy generator set, the disturbance prevention function of the frequency modulation device is realized, and the frequency modulation device of the new energy station has the functions of frequency disturbance prevention, voltage + frequency disturbance prevention and the like.
Examples of the applications
A disturbance prevention testing method for a frequency modulation device of a new energy station comprises the following steps:
a) adding three-phase 81% Un voltage on a bus voltage acquisition board of a frequency modulation device of a certain wind power plant by using a high-precision frequency signal generator, and completing two phase shifts 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 figure 3, so that the disturbance prevention function of the frequency modulation device is correct;
b) adding three-phase 81% Un voltage on a bus voltage acquisition board of a frequency modulation device of a certain wind power plant by using a high-precision frequency signal generator, wherein the frequency is 50.15Hz during the voltage drop period, and the frequency modulation device acts as seen from the active power in figure 4, so that the disturbance prevention function of the frequency modulation device is correct;
c) the three-phase 79% Un voltage is added to a bus voltage acquisition board of a frequency modulation device of a certain wind power plant by using a high-precision frequency signal generator, the frequency is 50.15Hz during the voltage drop period, and the frequency modulation device acts as seen from the active power in figure 5, so that the disturbance prevention function of the frequency modulation device is correct.
d) BC-phase rated voltage and A-phase 79% Un voltage are added to a bus voltage acquisition board of a frequency modulation device of a certain wind power plant by using a high-precision frequency signal generator, the frequency is 50.15Hz during voltage drop, and the frequency modulation device does not act as seen from active power in figure 6, so that the disturbance prevention function of the frequency modulation device is correct.
e) A high-precision frequency signal generator is utilized to add C-phase rated voltage and AB-phase 79% Un voltage to a bus voltage acquisition board of a frequency modulation device of a certain wind power plant, the frequency is 50.15Hz during voltage drop, and the frequency modulation device does not act as seen from active power in figure 7, so that the disturbance prevention function of the frequency modulation device is correct.
The foregoing shows and describes the general principles, essential 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, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A disturbance prevention testing method for a frequency modulation device of a new energy station is characterized by comprising 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 a frequency signal with specified frequency amplitude and change rate to a bus voltage acquisition board of a frequency modulation device by using a frequency signal generator so as to simulate the frequency change of a power grid; the electricity quantity recording analyzer is used for acquiring corresponding voltage and current signals of the new energy station and frequency signals output by the frequency signal generator, and analyzing frequency and total station power response curves, so that the frequency modulation device is tested in three aspects of frequency disturbance prevention, voltage disturbance prevention and voltage and frequency disturbance prevention.
2. The new energy station frequency modulation device disturbance prevention test method according to claim 1, characterized in that: the frequency signal with the specified frequency amplitude and the specified 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 new energy station frequency modulation device disturbance prevention test method according to claim 1, characterized in that: the frequency disturbance prevention test is divided into three tests of frequency variation, frequency variation rate, frequency variation and frequency variation rate disturbance, and specifically comprises the following steps:
a) setting a power grid frequency variation and a frequency variation rate dead zone as +/-0.05 Hz and +/-0.05 Hz/s respectively;
b) adding frequency variation through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and obtaining the frequency variation deltafWhen the dead zone is exceeded, the frequency modulation device can act;
c) adding frequency change rate through a frequency signal generator, collecting and analyzing by an electric quantity recording analyzer, and obtaining the frequency change rate dfWhen the/dt exceeds the dead zone, the frequency modulation device can act;
d) adding frequency variation and frequency variation rate by a frequency signal generator, and collecting and analyzing by an electric quantity recording analyzer, wherein when the frequency variation delta isfOver dead band and rate of change of frequency dfThe frequency modulation device can act only when the/dt exceeds the dead zone.
4. The new energy station frequency modulation device disturbance prevention test method according to claim 3, characterized in that: the frequency disturbance prevention test also needs to respectively carry out frequency variation, change rate + change quantity disturbance tests of single-phase, two-phase and three-phase test voltages; in the above test, only the frequency variation, the rate of change + the variation disturbance of the three phases, and the frequency variation ΔfAnd the frequency change rate dfThe frequency modulation device can act only when the/dt exceeds the dead zone.
5. The new energy station frequency modulation device disturbance prevention test method according to claim 1, characterized in that: 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 disturbance prevention tests;
b) respectively carrying out single-phase voltage rise, two-phase voltage rise and three-phase voltage rise 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 testing the even harmonic voltage, the odd harmonic voltage wave and the total harmonic distortion exceeding of the single-phase voltage, the two-phase voltage and the three-phase voltage;
e) respectively carrying out PT disconnection tests of single-phase voltage, two-phase voltage and three-phase voltage;
f) carrying out a three-phase voltage negative sequence unbalance test;
none of the frequency tuning devices were able to operate in the above tests.
6. The new energy station frequency modulation device disturbance prevention test method according to claim 5, characterized in that: when the voltage is symmetrically or asymmetrically dropped, raised or linked in the voltage disturbance prevention test, two phase shifts are completed during voltage dropping and recovery, and each phase shift is more than or equal to 60 degrees; two phase shifts are accomplished at voltage rise and recovery, each phase shift being ≧ 60 degrees.
7. The new energy station frequency modulation device disturbance prevention test method according to claim 5, characterized in that: the voltage for preventing voltage drop, voltage rise and voltage cascading failure in the voltage disturbance 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 rise range of the wind power plant and the photovoltaic power plant 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 0% -130% Un.
8. The new energy station frequency modulation device disturbance prevention test method according to claim 1, characterized in that: the voltage and frequency disturbance prevention test comprises a voltage range internal frequency disturbance test and a voltage range external frequency disturbance test, and specifically comprises the following steps:
a) setting a frequency modulation action voltage range to be 85% Un-115% Un by the frequency modulation device;
b) the voltage drop or rise of the test voltage is within a set voltage range of 85% Un-115% Un, and the frequency is disturbed during the voltage drop or rise; respectively testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance, and three-phase voltage and frequency disturbance;
c) the voltage drop or rise and the frequency disturbance during the voltage drop or rise are carried out when the test voltage is outside the set voltage range of 85% Un-115% Un; respectively testing under the conditions of single-phase voltage and frequency disturbance, two-phase voltage and frequency disturbance, and three-phase voltage and frequency disturbance;
variation in three-phase frequency only ΔfAnd the frequency change rate dfThe/dt exceeds the dead zone, and the frequency modulation device can only act when the test voltage is within the set voltage range of 85% Un-115% Un.
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|---|---|---|---|---|
| CN114050586A (en) * | 2021-11-22 | 2022-02-15 | 国网冀北电力有限公司电力科学研究院 | Flexible and direct new energy station power control performance test method and device |
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