CN110943474A - Photovoltaic module output characteristic analysis method under power grid side fault - Google Patents
Photovoltaic module output characteristic analysis method under power grid side fault Download PDFInfo
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- CN110943474A CN110943474A CN201911018644.2A CN201911018644A CN110943474A CN 110943474 A CN110943474 A CN 110943474A CN 201911018644 A CN201911018644 A CN 201911018644A CN 110943474 A CN110943474 A CN 110943474A
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Abstract
The invention belongs to the technical field of fault analysis, and particularly relates to a photovoltaic module output characteristic analysis method under a power grid side fault. The method is based on a Matlab/Simulink simulation model, and the influence of various grid-side faults on the output characteristics of the photovoltaic module is analyzed by simulating the grid-side faults, so that the problem that the grid-side faults are not easy to simulate is solved, and the method has important significance for solving the optimization of parameters of the photovoltaic module and the stable operation of a power system.
Description
Technical Field
The invention belongs to the technical field of fault analysis, relates to analysis of output characteristics of a photovoltaic system when various faults occur on a power grid side, and particularly relates to a method for analyzing the output characteristics of a photovoltaic module under the fault of the power grid side.
Background
With the development of industry, fossil energy is gradually exhausted, photovoltaic power generation is in a rapid development and large-scale application stage as a clean renewable energy, and grid connection of a large-scale photovoltaic power generation system is an important development direction in the future. In recent years, with the scale of the power grid becoming larger and larger, more and more elements are used, so that the reliability of various modules is reduced, and the failure rate of the power grid becomes higher and higher. The output power of the component of the photovoltaic power generation system is consistent with the output power of the photovoltaic inverter in the actual operation process, when the power grid fluctuates greatly, the adjustment capability of the photovoltaic inverter is limited, the MPPT tracking function is disordered, and the maximum power point cannot be found, so that the output power of the whole solar cell array is reduced. Considering that the photovoltaic power generation is susceptible to interference from the grid side, and the output power of the photovoltaic module is reduced, it is particularly necessary to study the transient characteristics of the photovoltaic power generation under the disturbance of the grid side. At present, most of researches on a photovoltaic power generation system and a power grid system stay in the influence of photovoltaic power generation fluctuation on the operation of a power grid, and the influence of the fluctuation of the power grid on the output power of the photovoltaic power generation system when a fault occurs on the power grid side is ignored.
Disclosure of Invention
The invention aims to provide a method for analyzing the output characteristics of a photovoltaic module under the condition of a power grid side fault.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for analyzing output characteristics of a photovoltaic module under a power grid side fault is characterized by comprising the following steps: the method comprises the following steps:
and 3, analyzing the influence of the power grid side fault on the output characteristic of the photovoltaic module according to the fluctuation generated by the power grid side fault, which is determined by simulating the power grid side fault modeling.
In the step 1, the simulation modeling of the grid-connected photovoltaic module system comprises modeling of a photovoltaic group string, a photovoltaic booster, a grid-connected inverter and a power grid based on Matlab/Simulink software.
In the step 2, the power grid side fault modeling comprises modeling of power grid side faults of load sudden change, voltage sudden change and single-phase grounding short circuit based on Matlab/Simulink software.
In the step 3, the voltage mutation analysis method in the power grid side fault comprises the following steps: the simulation photovoltaic module works in a standard condition output environment, the voltage fluctuation of a power grid is set, the fluctuation size is determined according to the actual simulation voltage fault, and the change condition of the output power of the photovoltaic module is analyzed according to the voltage fluctuation size.
In the step 3, the method for analyzing the load sudden change in the power grid side fault comprises the following steps: the simulation photovoltaic module works in a standard condition output environment, power grid load fluctuation is set, the fluctuation size is determined according to actual simulated load faults, and the change condition of the output power of the photovoltaic module is analyzed according to the load fluctuation size.
In the step 3, the method for analyzing the single-phase grounding short circuit in the power grid side fault comprises the following steps: the simulation photovoltaic module works in a standard condition output environment, a single-phase earth fault of a certain phase voltage in A, B, C three phases is set, and the change condition of the output power of the photovoltaic module under the fault is analyzed.
The invention has the beneficial effects that: the Matlab/Simulink-based simulation method can accurately and quickly obtain the influence of the power grid side fault which is difficult to simulate in practice on the output characteristics of the photovoltaic system, solves the problem that the fault is difficult to simulate in practice under the high voltage level of the power grid side, and has important significance for the stable operation of the photovoltaic power generation system.
Drawings
FIG. 1 is a simulation model of a photovoltaic power generation system Matlab/Simulink;
FIG. 2 is a simulation model of Matlab/Simulink of a 110kV power grid;
FIG. 3 is a grid-side fault simulation model of simulated voltage fluctuations;
FIG. 4 is a grid-side fault simulation model for simulating load changes;
FIG. 5 is a grid-side fault simulation model for simulating a single-phase ground fault;
FIG. 6 is a simulation diagram of three-phase voltage fluctuation variation when the simulation voltage jumps;
FIG. 7 is a graph of the output power of a photovoltaic module according to the present invention at voltage transitions;
FIG. 8 is a simulation diagram of three-phase voltage variation in the case of simulating load variation according to the present invention;
FIG. 9 is a graph of photovoltaic module output power with varying load according to the present invention;
FIG. 10 is a simulation diagram of the three-phase voltage variation in the present invention when the phase C is short-circuited to ground;
fig. 11 is a graph of photovoltaic module output power in case of phase C ground fault.
Detailed Description
The technical scheme of the invention is further explained by specific embodiments in the following with the accompanying drawings:
example 1
The invention aims to provide a method for analyzing the output characteristics of a photovoltaic module under the condition of power grid side faults.
The technical scheme adopted by the invention is that the method for analyzing the output characteristic of the photovoltaic module under the condition of the power grid side fault comprises the following steps:
step 1: modeling a photovoltaic group string, a photovoltaic booster and a grid-connected inverter based on Matlab/Simulink software; FIG. 1 shows a schematic view of a
Step 2: carrying out simulation modeling on the power grid based on Matlab/Simulink software; FIG. 2
And step 3: modeling the power grid side faults of load sudden change, voltage sudden change and single-phase grounding short circuit based on Matlab/Simulink software; FIGS. 3, 4 and 5
And 4, step 4: the simulation photovoltaic module works in a standard condition output environment, the voltage fluctuation of a power grid is set, the fluctuation size is determined according to the actual simulation voltage fault, and the change condition of the output power of the photovoltaic module is analyzed according to the voltage fluctuation size. The component output condition in this case reflects the influence of voltage changes on the output characteristics of the photovoltaic component;
and 5: the simulation photovoltaic module works in a standard condition output environment, power grid load fluctuation is set, the fluctuation size is determined according to actual simulated load faults, and the change condition of the output power of the photovoltaic module is analyzed according to the load fluctuation size. The component output condition in this case reflects the influence of load variation on the output characteristics of the photovoltaic component;
step 6: the simulation photovoltaic module works in a standard condition output environment, a single-phase earth fault of a certain phase voltage in A, B, C three phases is set, and the change condition of the output power of the photovoltaic module under the fault is analyzed. The output condition of the assembly in the condition reflects the influence of the single-phase earth fault on the output power of the whole photovoltaic assembly.
Example 2
And selecting a solar panel model which is basically consistent with actual parameters, taking a sunpower SPR-305E-WHT-D monocrystalline silicon module as an example, wherein 5 modules of the whole photovoltaic array are in a string, one module has 66 strings, and the total capacity is Pm which is 100 KW. The voltage output by the photovoltaic inverter is 380V, the voltage is increased to 35kV through a transformer, the voltage is boosted by a 110kV transformer through a 19km line and then is connected into a power grid with the capacity of 110kV, the load capacity of the connected power grid is 32MW, and the resistance, the inductance and the capacitance of the line in unit length are 0.1153 omega, 1.05-3H and 11.3310-9F respectively.
The simulated photovoltaic battery string works in a standard condition environment with irradiance S being 1000Lx and T being 25 ℃. When the voltage is set to be 0.8s, the voltage of the power grid is reduced to be 20% of the original voltage, and when the voltage of the power grid is recovered within 1.2s, the photovoltaic component is in the output environment of standard conditions within 1.2-2s and is in a stable voltage state so as to be compared with the voltage change condition. After the grid voltage is changed, the three-phase voltage change situation is shown in fig. 6, and the output situation of the photovoltaic module is shown in fig. 7.
The simulated photovoltaic battery string works in a standard condition environment with irradiance S being 1000Lx and T being 25 ℃. The setting was at 1s with a load of 2MW removed and at 1.5 with a load recovery. Within 1.5-2s, the photovoltaic module is in a standard output environment, and the load in the power grid is unchanged, so that the situation of load change is contrasted. After the load is changed, the three-phase voltage change situation is shown in fig. 8, and the output situation of the photovoltaic module is shown in fig. 9.
And the simulated photovoltaic battery pack string works in a standard condition environment with irradiance S being 1000Lx and T being 25 ℃, the C is connected with the ground short circuit when 0.8S is set, and the fault is removed when 0.9S is set. The 0.9-2s photovoltaic battery string works normally and no short circuit fault occurs in the power grid to contrast with the situation when the power grid fails. After the single-phase grounding short circuit is simulated, the change condition of the three-phase voltage is shown in fig. 10, and the output condition of the photovoltaic module is shown in fig. 11.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A method for analyzing output characteristics of a photovoltaic module under a power grid side fault is characterized by comprising the following steps: the method comprises the following steps:
step 1, carrying out simulation modeling on a grid-connected photovoltaic system and a power grid based on Matlab/Simulink software;
step 2, modeling the power grid side fault based on Matlab/Simulink software;
and 3, simulating a power grid side fault, and analyzing the influence of the fault on the output characteristic of the photovoltaic module according to the power grid fluctuation.
2. The method for analyzing the output characteristics of the photovoltaic module under the power grid side fault condition according to claim 1, wherein the method comprises the following steps: in the step 1, the simulation modeling of the grid-connected photovoltaic system comprises modeling of a photovoltaic group string, a photovoltaic booster, a grid-connected inverter and a power grid based on Matlab/Simulink software.
3. The method for analyzing the output characteristics of the photovoltaic module under the power grid side fault condition according to claim 1, wherein the method comprises the following steps: in the step 2, the power grid side fault modeling comprises modeling of power grid side faults of load sudden change, voltage sudden change and single-phase grounding short circuit based on Matlab/Simulink software.
4. The method for analyzing the output characteristics of the photovoltaic module under the power grid side fault condition according to claim 1, wherein the method comprises the following steps: in the step 3, the voltage mutation analysis method in the power grid side fault comprises the following steps: the simulation photovoltaic module works in a standard condition output environment, the voltage fluctuation of a power grid is set, the fluctuation size is determined according to the actual simulation voltage fault, and the change condition of the output power of the photovoltaic module is analyzed according to the voltage fluctuation size.
5. The method for analyzing the output characteristics of the photovoltaic module under the power grid side fault condition according to claim 1, wherein the method comprises the following steps: in the step 3, the method for analyzing the load sudden change in the power grid side fault comprises the following steps: the simulation photovoltaic module works in a standard condition output environment, power grid load fluctuation is set, the fluctuation size is determined according to actual simulated load faults, and the change condition of the output power of the photovoltaic module is analyzed according to the load fluctuation size.
6. The method for analyzing the output characteristics of the photovoltaic module under the power grid side fault condition according to claim 1, wherein the method comprises the following steps: in the step 3, the method for analyzing the single-phase grounding short circuit in the power grid side fault comprises the following steps: the simulation photovoltaic module works in a standard condition output environment, a single-phase earth fault of a certain phase voltage in A, B, C three phases is set, and the change condition of the output power of the photovoltaic module under the fault is analyzed.
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| CN102013700A (en) * | 2010-11-24 | 2011-04-13 | 甘肃省电力设计院 | Large-and-medium-sized photovoltaic power station grid-connected characteristic research and electric energy quality evaluation method |
| CN104734192A (en) * | 2015-04-03 | 2015-06-24 | 国家电网公司 | Wholly-balanced micro-grid system |
| CN105608252A (en) * | 2015-12-05 | 2016-05-25 | 青海电研科技有限责任公司 | Simulation method and apparatus for power grid fault simulation test |
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