CN113740654A - Control method for realizing various change characteristics of power grid voltage - Google Patents
Control method for realizing various change characteristics of power grid voltage Download PDFInfo
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Abstract
The control method for realizing various change characteristics of the power grid voltage comprises the following steps of simulating the frequency change, amplitude change, harmonic voltage injection, three-phase voltage unbalance and voltage fluctuation working conditions of the power grid voltage; the frequency change is that the voltage is unchanged, the output frequency is different in different time periods, and the amplitude is changed into that the frequency is unchanged, and different amplitudes are output in different time periods; harmonic voltage injection is to superpose fundamental voltage and harmonic, and three-phase voltage unbalance is realized by injecting a negative sequence component; the voltage fluctuation is realized by taking a periodically changing signal as an input. The control method for realizing various change characteristics of the power grid voltage can simulate various working conditions of the power grid voltage and can meet various power grid voltage requirements in the test process of the photovoltaic and wind power grid-connected equipment, the energy storage equipment, the frequency converter and other electric equipment.
Description
Technical Field
The invention relates to a method for simulating various change characteristics of power grid voltage, in particular to a control method capable of simulating frequency change, amplitude change, harmonic voltage injection, three-phase voltage unbalance and voltage fluctuation working conditions of the power grid voltage.
Background
With the development of economy in China, a large amount of power electronic equipment is put into operation. The rapid development of photovoltaic and wind power industries makes great progress on new energy in China and reduces pollution to social environment. The frequency converters are used in large quantity, and play a great role in energy conservation and emission reduction in China.
When the grid-connected equipment of photovoltaic and wind power is connected to a power grid to operate, if the fluctuation of the power grid changes, the grid-connected equipment cannot reliably operate, and the grid disconnection phenomenon occurs, the power supply of the whole power grid further fluctuates, and a larger power grid power supply accident is caused.
When the frequency converter and other electric equipment are connected to a power grid to operate, if power grid fluctuation changes, grid-connected equipment cannot reliably operate, the frequency converter stops operating, a load dragged by a rear-stage motor is inevitably stopped, normal production stagnation in a production process is caused, economic damage is caused, and even safety accidents can occur in some application fields.
Therefore, the state has certain requirements on power grid adaptability of photovoltaic and wind power grid-connected equipment, energy storage equipment, frequency converters and other electric equipment. There is a need for a device for achieving various changes in grid voltage that can output various changes in grid voltage.
Disclosure of Invention
In order to overcome the defects of the technical problems, the invention provides a control method for realizing various change characteristics of the voltage of a power grid.
The control method for realizing various change characteristics of the power grid voltage comprises the following steps of simulating the frequency change, amplitude change, harmonic voltage injection, three-phase voltage unbalance and voltage fluctuation working conditions of the power grid voltage; the method is characterized in that: the frequency change is that under the condition of keeping the magnitude of the output voltage unchanged, the output voltages in different time periods are set to different frequencies, and the simulated voltage is used for detecting the adaptability of the tested device to the frequency change; the amplitude change is that under the condition of keeping the frequency of the output voltage unchanged, the output voltages in different time periods are set to different amplitudes, and the simulated voltage is used for detecting the adaptability of the tested device to the amplitude change;
the harmonic voltage injection is to superpose the output fundamental voltage signal with odd harmonic and even harmonic with adjustable frequency and voltage, to synthesize output voltage with harmonic voltage injection, and the simulated voltage is used to detect the adaptability of the tested device in the harmonic injection state; the three-phase voltage unbalance is output voltage formed by injecting negative sequence components, and the simulated voltage is used for detecting the adaptability of the tested device to the three-phase voltage unbalance; the voltage fluctuation is an input amplitude which takes a periodic variation signal with controllable amplitude and frequency as a power frequency voltage signal to form an output voltage with periodically fluctuating amplitude, and the simulated voltage is used for detecting the adaptability of the device in a voltage fluctuation state.
The invention discloses a control method for realizing various change characteristics of power grid voltage, which comprises the following specific simulation methods of frequency change working conditions: first according to (t)0,t1)、(t1,t2)、...、(tn-1,tn) The output voltage is divided into n time segments, followed by a time segment (t)0,t1)、9t1,t2)、...、(tn-1,tn) The output voltages being respectively assigned different frequencies f0、f1、...、fn-1And forming a voltage output with variable frequency.
The invention discloses a control method for realizing various change characteristics of power grid voltage, which comprises the following specific simulation methods of amplitude change working conditions: first according to (t)0,t1)、(t1,t2)、...、(tn-1,tn) The output voltage is divided into n time segments, followed by a time segment (t)0,t1)、9t1,t2)、...、(tn-1,tn) The output voltage in the voltage divider is distributed with a constant voltage value or a continuously variable voltage value to form a voltage output with a variable amplitude.
According to the control method for realizing various change characteristics of the power grid voltage, the output voltage of the harmonic voltage injection working condition is synthesized according to the formula (1):
V＝V0*COS(ωt)+Vm*COS(m*ωt)+Vn*COS(n*ωt) (1)
wherein, V is the output voltage when the harmonic voltage is injected, V0, omega are the amplitude and frequency of the fundamental voltage signal respectively, Vm is the amplitude of the odd harmonic signal, m x omega is the frequency of the odd harmonic signal, m is the odd number; vn is the amplitude of the even harmonic signal, n x ω is the frequency of the even harmonic signal, and n is an even number.
According to the control method for realizing various change characteristics of the power grid voltage, the output voltage of the three-phase voltage unbalance working condition is synthesized according to a formula (2):
V′＝V0*COS(2π*f0*t)+V1*COS(2π*f1*t) (2)
v' is the output voltage when the three-phase voltage is unbalanced, V0 and f0 are the amplitude and frequency of the fundamental voltage signal, V1 and f1 are the amplitude and frequency of the injected negative sequence component, and f1 is-f 0; by changing the amplitude V1 of the injected negative sequence component, the degree of unbalance of the three-phase voltages is changed.
The invention discloses a control method for realizing various change characteristics of power grid voltage, which comprises the following specific simulation methods of voltage fluctuation working conditions:
first, a sinusoidal signal with frequency ω 2 and amplitude V2 is generated as shown in equation (3):
V2*COS(2π*ω2*t) (3)
then, the sinusoidal signal of formula (3) is added to a dc component V3 using formula (4), resulting in a signal V4 with periodically varying amplitude:
V4＝V2*COS(2π*ω2*t)+V3 (4)
finally, using V4 as the amplitude and ω as the frequency, an output voltage with voltage fluctuations as shown in equation (5) is generated
V″＝V4*COS(2π*ω*t) (5)
ω is the frequency of the fundamental voltage signal, respectively.
The invention has the beneficial effects that: the control method for realizing various change characteristics of the power grid voltage can simulate the power grid voltage with output frequency change, amplitude change, harmonic voltage injection, three-phase voltage unbalance and voltage fluctuation working conditions, can meet various power grid voltage requirements in the test process of power consumption equipment such as grid-connected equipment of photovoltaic and wind power, energy storage equipment, a frequency converter and the like, solves the problem that various power grid working conditions cannot be obtained in the test process of the existing power consumption equipment, has obvious beneficial effects, and is suitable for application and popularization.
Drawings
FIG. 1 is a schematic diagram of the output of the simulated grid frequency change condition in the present invention;
FIG. 2 is a schematic diagram of the output of the invention for simulating the amplitude variation condition of the power grid;
FIG. 3 is a schematic diagram of the output of the harmonic voltage injection condition of the simulation grid of the present invention;
FIG. 4 is a schematic diagram of the output of the three-phase voltage unbalance condition of the simulation power grid according to the present invention;
FIG. 5 is a schematic diagram of a simulated grid voltage fluctuation condition output according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
The control method for realizing various change characteristics of the power grid voltage can output various change power grid voltages, including power grid voltage frequency change, amplitude change, harmonic voltage injection, three-phase voltage unbalance and voltage fluctuation working conditions.
The frequency change is that under the condition of keeping the output voltage unchanged, the output voltages in different time periods are set to different frequencies, and the simulated voltage is used for detecting the adaptability of the tested device to the frequency change. The device changes the output frequency according to a set curve by setting different frequency points and corresponding frequency change holding time and giving a command to a device controller.
As shown in fig. 1, a schematic diagram of the output of the simulated grid frequency change condition in the invention is given, under the condition of rated voltage output, the frequency change of the output voltage is realized, the frequency from time t0 to time t1 is f0, the frequency change from time t1 to time t1 is realized, after a period of time, the time t2 is reached, the frequency change is f2, after a period of time, the time t3 is reached, the frequency change is f3, the size and the frequency change time of different frequency increases can be set, the change rule of the voltage frequency can be customized, the change of the output frequency is performed according to a set curve, thereby realizing the grid voltage frequency change, and the adaptability of the device to the frequency change is detected.
The amplitude change is that under the condition of keeping the frequency of the output voltage unchanged, the output voltages in different time periods are set to different amplitudes, and the simulated voltage is used for detecting the adaptability of the tested device to the amplitude change; the device changes the output frequency according to a set curve by setting different frequency points and corresponding frequency change holding time and giving a command to a device controller.
As shown in fig. 2, a schematic diagram of the output of the analog grid amplitude change condition is given, the voltage from time t0 to time t1 is V0, the voltage corresponding to time t1 changes to V1, and after a period of time, the voltage reaches time t2, and the voltage slowly changes to the voltage V3 from time t2 to time t 3. After the voltage is continuously maintained for a period of time and at the moment of t4, the voltage is changed into V4, the voltage is changed into instantaneous drop and rise and slowly rises, the voltage can be changed under different requirements, the change rule of the voltage amplitude value can be customized, the device outputs the change of the voltage amplitude value according to a set curve, and the adaptability of the tested equipment to the amplitude value change is detected.
The harmonic voltage injection is to superpose the output fundamental voltage signal with odd harmonic and even harmonic with adjustable frequency and voltage, to synthesize the output voltage with harmonic voltage injection, and the analog voltage is used to detect the adaptability of the tested device in the harmonic injection state.
The output voltage of the harmonic voltage injection working condition is synthesized according to the formula (1):
V＝V0*COS(ωt)+Vm*COS(m*ωt)+Vn*COS(n*ωt) (1)
wherein, V is the output voltage when the harmonic voltage is injected, V0, omega are the amplitude and frequency of the fundamental voltage signal respectively, Vm is the amplitude of the odd harmonic signal, m x omega is the frequency of the odd harmonic signal, m is the odd number; vn is the amplitude of the even harmonic signal, n x ω is the frequency of the even harmonic signal, and n is an even number.
As shown in fig. 3, a schematic diagram of the output of the simulated grid harmonic voltage injection condition of the present invention is given, first, sinusoidal voltage signals of fundamental frequency w and amplitude V0 are output, and simultaneously, harmonic signals need to be superimposed, the odd harmonic amplitude is Vm, the harmonic frequency is m w, m is odd, the even harmonic amplitude is Vn, the harmonic frequency is n w, and n is even, a final signal V is synthesized, and then, a final output voltage is modulated, thereby implementing grid voltage harmonic voltage injection. The frequency and the amplitude of the superposed harmonic signals can be set, and the input of various harmonics is realized. The device carries out the change of harmonic voltage injection according to a set curve by defining a curve for injecting the harmonic and giving a command to a device controller, and detects the adaptability of the tested device to the harmonic voltage injection.
The three-phase voltage unbalance is output voltage formed by injecting negative sequence components, and the simulated voltage is used for detecting the adaptability of the tested device to the three-phase voltage unbalance; the output voltage of the three-phase voltage unbalance working condition is synthesized according to the formula (2):
V′＝V0*COS(2π*f0*t)+V1*COS(2π*f1*t) (2)
v' is the output voltage when the three-phase voltage is unbalanced, V0 and f0 are the amplitude and frequency of the fundamental voltage signal, V1 and f1 are the amplitude and frequency of the injected negative sequence component, and f1 is-f 0; by changing the amplitude V1 of the injected negative sequence component, the degree of unbalance of the three-phase voltages is changed.
As shown in fig. 4, a schematic diagram of the output of the power grid three-phase voltage unbalance condition simulation of the invention is given, and the output voltage is formed into a three-phase voltage unbalance mode by injecting a negative sequence component. The fundamental wave voltage signal is V0, the operating frequency is f0, the injection negative sequence voltage is V1, the operating frequency is f1, the injection negative sequence voltage V1 can be set, and the operating frequency is f 1-f 0. The three-phase output voltage output by the device has different amplitudes, so that the three-phase voltage unbalance is realized, and the unbalance degree of the three-phase voltage is adjusted through the negative sequence voltage V1.
The voltage fluctuation is the input amplitude of the periodic variation signal with controllable amplitude and frequency as the power frequency voltage signal, the output voltage with periodically fluctuating amplitude is formed, and the simulated voltage is used for detecting the adaptability of the device in the voltage fluctuation state.
The specific simulation method of the voltage fluctuation working condition comprises the following steps:
first, a sinusoidal signal with frequency ω 2 and amplitude V2 is generated as shown in equation (3):
V2*COS(2π*ω2*t) (3)
then, the sinusoidal signal of formula (3) is added to a dc component V3 using formula (4), resulting in a signal V4 with periodically varying amplitude:
V4＝V2*COS(2π*ω2*t)+V3 (4)
finally, using V4 as the amplitude and ω as the frequency, an output voltage with voltage fluctuations as shown in equation (5) is generated
V″＝V4*COS(2π*ω*t) (5)
ω is the frequency of the fundamental voltage signal, respectively.
As shown in FIG. 5, firstly, a sinusoidal signal is generated from a frequency w2 and an amplitude V2, the signal is changed into an amplitude V4 with a period change through V3 addition, V4 is used as an amplitude input value with a change frequency w, finally, a required voltage V 'is output, the amplitude of the output voltage V' shows periodic fluctuation, the period and the amplitude of the amplitude fluctuation of the whole output voltage can be controlled through a control method, voltage changes of different fluctuation conditions are achieved, and the test of the device to be tested is realized.
Claims (6)
1. A control method for realizing various change characteristics of power grid voltage comprises simulating frequency change, amplitude change, harmonic voltage injection, three-phase voltage unbalance and voltage fluctuation working conditions of the power grid voltage; the method is characterized in that: the frequency change is that under the condition of keeping the magnitude of the output voltage unchanged, the output voltages in different time periods are set to different frequencies, and the simulated voltage is used for detecting the adaptability of the tested device to the frequency change; the amplitude change is that under the condition of keeping the frequency of the output voltage unchanged, the output voltages in different time periods are set to different amplitudes, and the simulated voltage is used for detecting the adaptability of the tested device to the amplitude change;
the harmonic voltage injection is to superpose the output fundamental voltage signal with odd harmonic and even harmonic with adjustable frequency and voltage, to synthesize output voltage with harmonic voltage injection, and the simulated voltage is used to detect the adaptability of the tested device in the harmonic injection state; the three-phase voltage unbalance is output voltage formed by injecting negative sequence components, and the simulated voltage is used for detecting the adaptability of the tested device to the three-phase voltage unbalance; the voltage fluctuation is an input amplitude which takes a periodic variation signal with controllable amplitude and frequency as a power frequency voltage signal to form an output voltage with periodically fluctuating amplitude, and the simulated voltage is used for detecting the adaptability of the device in a voltage fluctuation state.
2. The control method for realizing various change characteristics of the grid voltage according to claim 1, wherein the specific simulation method of the frequency change working condition is as follows: first according to (t)0，t1)、(t1，t2)、...、(tn-1，tn) The output voltage is divided into n time segments, followed by a time segment (t)0，t1)、(t1，t2)、...、(tn-1，tn) The output voltages being respectively assigned different frequencies f0、f1、...、fn-1And forming a voltage output with variable frequency.
3. The control method for realizing various change characteristics of the grid voltage according to claim 1 or 2, characterized by comprising the following steps: the specific simulation method of the amplitude variation working condition comprises the following steps: first according to (t)0，t1)、(t1，t2)、...、(tn-1，tn) The output voltage is divided into n time segments, followed by a time segment (t)0，t1)、(t1，t2)、...、(tn-1，tn) The output voltage in the voltage divider is distributed with a constant voltage value or a continuously variable voltage value to form a voltage output with a variable amplitude.
4. The control method for realizing various change characteristics of the grid voltage according to claim 1 or 2, characterized by comprising the following steps: the output voltage of the harmonic voltage injection working condition is synthesized according to the formula (1):
V＝V0*COS(ωt)+Vm*COS(m*ωt)+Vn*COS(n*ωt) (1)
wherein, V is the output voltage when the harmonic voltage is injected, V0, omega are the amplitude and frequency of the fundamental voltage signal respectively, Vm is the amplitude of the odd harmonic signal, m x omega is the frequency of the odd harmonic signal, m is the odd number; vn is the amplitude of the even harmonic signal, n x ω is the frequency of the even harmonic signal, and n is an even number.
5. The control method for realizing various change characteristics of the grid voltage according to claim 1 or 2, characterized by comprising the following steps: the output voltage of the three-phase voltage unbalance working condition is synthesized according to a formula (2):
V′＝V0*COS(2π*f0*t)+V1*COS(2π*f1*t) (2)
v' is the output voltage when the three-phase voltage is unbalanced, V0 and f0 are the amplitude and frequency of the fundamental voltage signal, V1 and f1 are the amplitude and frequency of the injected negative sequence component, and f1 is-f 0; by changing the amplitude V1 of the injected negative sequence component, the degree of unbalance of the three-phase voltages is changed.
6. The control method for realizing various change characteristics of the power grid voltage according to claim 1 or 2, wherein the specific simulation method of the voltage fluctuation working condition is as follows:
first, a sinusoidal signal with frequency ω 2 and amplitude V2 is generated as shown in equation (3):
V2*COS(2π*ω2*t) (3)
then, the sinusoidal signal of formula (3) is added to a dc component V3 using formula (4), resulting in a signal V4 with periodically varying amplitude:
V4＝V2*COS(2π*ω2*t)+V3 (4)
finally, using V4 as the amplitude and ω as the frequency, an output voltage with voltage fluctuations as shown in equation (5) is generated
V″＝V4*COS(2π*ω*t) (5)
ω is the frequency of the fundamental voltage signal, respectively.
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| CN202093155U (en) * | 2011-05-03 | 2011-12-28 | 国网电力科学研究院 | Large-volume multi-adaptable detection platform for grid-connected photovoltaic inverter |
| CN109713707A (en) * | 2019-01-10 | 2019-05-03 | 华北电力大学 | A kind of method of MMC submodule voltage fluctuation under reduction unbalanced electric grid voltage |
| CN110286278A (en) * | 2019-06-04 | 2019-09-27 | 广州智光电气技术有限公司 | A kind of output voltage control method, device and grid adaptability detection platform |
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