CN106856331B - Grid-connected performance testing method for wind-solar combined power generation system - Google Patents
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Abstract
The invention relates to a method for testing the grid-connected performance of a wind-solar combined power generation system, which comprises the following steps: step 1: determining a test point for field test of the wind-solar combined power generation system; step 2: determining a test condition of field detection of the wind-solar combined power generation system; and step 3: determining the test content of the scene detection of the wind-solar combined power generation system; and 4, step 4: and testing the grid-connected point performance of the wind-solar combined power generation system. The technical scheme provided by the invention solves the problem of field detection of the grid-connected performance of the power generation system, and has very important significance for improving the standardization and the accuracy of the field test of the wind power combined power generation system.
Description
Technical Field
The invention relates to a testing method for new energy access and control, in particular to a testing method for grid-connected performance of a wind-solar hybrid power generation system.
Background
The wind-solar hybrid power generation system is a wind-solar complementary power supply system which comprehensively utilizes wind energy and light energy, and is a reasonable power supply system. Not only opens up a new way for solving the current energy crisis and environmental pollution problems, but also effectively improves the stability and reliability of the system when the wind power and the photovoltaic power generation output the electric power independently.
Due to the time and region constraints, it is difficult to utilize solar and wind energy resources in all weather for a single solar or wind energy system. The solar energy and the wind energy have strong complementarity in time and region, the wind is small when the illumination is strong in daytime, the wind energy is enhanced due to large surface temperature difference change when the illumination is weak at night, and the time complementarity of the solar energy and the wind energy is the optimal matching of the wind-solar complementary power generation system in resource utilization.
The wind-solar combined power generation system mainly comprises a wind power generation unit, a photovoltaic power generation unit and the like. The wind power generation unit converts wind energy into electric power for output by using a wind power generator set. The photovoltaic power generation unit adopts a photoelectric plate with a required scale to convert solar energy into electric power for output. Wind power and photovoltaic two power generation modes complement each other in the collection of the energy, have characteristic respectively again simultaneously: the photovoltaic power generation and supply is reliable, the operation and maintenance cost is low, and the manufacturing cost is high; the wind power generation has high power generation amount, low manufacturing cost and operation and maintenance cost, but low reliability.
The wind-solar hybrid power generation system utilizes natural complementarity of wind energy and solar energy, for example, solar energy is sufficient in the daytime, and wind energy is sufficient at night; solar energy is sufficient in summer and wind energy is sufficient in winter, so that the economical efficiency and the operation reliability of the system can be improved. In northwest, north China and other areas, wind energy and solar energy resources have complementarity, wind power is high in winter and spring seasons, and solar radiation is strong in summer and autumn seasons, so that the defects of randomness and intermittence of energy provided by wind energy and solar energy can be well overcome by adopting the wind energy/solar energy complementary power generation system, and uninterrupted power supply is realized.
The access of the wind and light combined power generation system has certain influence on peak regulation, stable operation and power quality of a power grid, and the fluctuation of wind and light enables the output power of the wind and light combined power generation system to have fluctuation, so that an accurate power generation plan is difficult to make and implement for the wind and light combined power generation system like a conventional power supply. The power fluctuation may cause the problems of voltage fluctuation, frequency fluctuation, transmission power fluctuation of a power transmission line and the like of a power grid, and the larger power impact may also cause power oscillation among synchronous generator sets in the power grid, and in severe cases, the stable operation of the power grid is damaged, and the safety of the power grid is directly influenced. With the development of the wind and light combined power generation system, research on a grid-connected performance test detection technology of the wind and light combined power generation system is urgently needed to ensure safe and stable operation of the power system after the wind and light combined power generation system is in grid-connected operation.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for testing the grid-connected performance of a wind-solar hybrid power generation system, which is very important for improving the standardization and the accuracy of the field test of the wind-solar hybrid power generation system.
The purpose of the invention is realized by adopting the following technical scheme:
the invention provides a method for testing the grid-connected performance of a wind-solar hybrid power generation system, which is improved in that the testing method comprises the following steps:
step 1: determining a test point for field test of the wind-solar combined power generation system;
step 2: determining a test condition of field detection of the wind-solar combined power generation system;
and step 3: determining the test content of the scene detection of the wind-solar combined power generation system;
and 4, step 4: and testing the grid-connected point performance of the wind-solar combined power generation system.
Further, in the step 1, a test point is determined according to a connection mode of the wind-solar hybrid power generation system; the method comprises the steps of (1) grid-connected test points of 220kV or 110kV grade and 35kV grade; the electric collection point of the wind-solar combined power generation system comprises: the main transformer high-voltage side 220kV three-phase voltage, the main transformer high-voltage side 220kV three-phase current, the main transformer low-voltage side 35kV three-phase voltage, the main transformer low-voltage side 35kV three-phase current, the wind power branch grid-connected point 35kV three-phase voltage, the wind power branch grid-connected point 35kV three-phase current, the photovoltaic branch grid-connected point 35kV three-phase voltage and the photovoltaic branch grid-connected point 35kV three-phase current.
Further, in the step 2, the test conditions of the field test of the wind-solar hybrid power generation system are as follows: the system has stable grid-connected operation capability, and has wind power independent power generation operation, photovoltaic independent power generation operation and wind-light combined power generation operation; during testing, the wind speed is required to have a working condition of 3-15m/s so as to ensure that the output power of the fan is in a range of 0-95% Pn; the light irradiation quantity is required to meet 0-7500MJ/m2So as to ensure that the output power of the photovoltaic power station is in the range from 0 to the rated power.
Further, in step 3, the test content of the field test of the wind-solar hybrid power generation system includes: according to the operation characteristics of the wind-solar combined power generation system, under the condition of not influencing power generation, the following three operation modes are tested, and through the acquired data, flicker, harmonic wave and power change rate power quality parameters are obtained through calculation and analysis (the calculation is obtained according to a formula in the national standard GB/T12326-2008):
(1) the wind power normally runs, and the photovoltaic is free of output, namely the test is carried out in the period of no light and wind at night;
(2) the photovoltaic operation is normal, and the wind power does not output power, namely the test is carried out in the time period of light and no wind in the daytime;
(3) wind power and photovoltaic normally operate, namely testing under the condition that wind and light are available at the same time in the daytime.
Further, the step 4 comprises:
firstly, wind power and photovoltaic power generation units in the wind-solar combined power generation system normally operate and respectively collect the wind power and the photovoltaic power, and the sampling frequency is not lower than 4 kHz;
wind power normally runs, and photovoltaic power does not output: the wind power output power is from 0 to 95% of rated power, 10% of rated power is taken as an interval, and at least measured values of 5 10min time sequence instantaneous voltage and instantaneous current values of a wind power plant grid-connected point are collected in each power interval and each phase;
photovoltaic normal operating, wind-powered electricity generation does not exert oneself: starting from the minimum power of the continuous normal operation of the photovoltaic power station, taking 10% of the total rated power of an inverter allocated to the photovoltaic power station as an interval, and respectively measuring data for 10min for 2 times in each interval;
wind power and photovoltaic normal operation: the wind and light output power is from 0 to 95% of rated power, 10% of rated power is taken as an interval, and at least 5 measured values of 10min time sequence instantaneous voltage and instantaneous current values of a wind power plant grid-connected point are collected in each power interval and each phase.
Further, the step 4 comprises: according to the GB/T12326-2008 electric energy quality, voltage fluctuation and flicker, the collected data are calculated and analyzed to obtain flicker, harmonic wave and power change rate electric energy quality parameters, so that the grid connection point performance of the tested wind-light combined power generation system is judged.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
(1) the test scheme has reasonable design: the wind power independent operation mode, the photovoltaic independent operation mode and the wind power and photovoltaic combined power generation operation mode are considered in the test, and the division of the three operation modes is beneficial to analyzing grid-connected performance indexes in different modes.
(2) The field operation mode is considered comprehensively: in an actual site, the wind power generation and photovoltaic power generation systems have different mutual influences due to different operation modes, and different operation modes need to be considered as much as possible.
(3) The field test points are reasonably selected: and the grid-connected points at different voltage levels are selected by the test points, so that grid-connected performance indexes of different power generation units can be reflected more truly.
Drawings
FIG. 1 is a schematic view of a simple wiring collection point provided by the present invention;
FIG. 2 is a schematic view of a plurality of photovoltaic branch collection points provided by the present invention;
FIG. 3 is a schematic view of a complex wiring pattern collection point provided by the present invention;
FIG. 4 is a flow chart of a method for testing grid-connected performance of the wind-solar hybrid power generation system provided by the invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
The invention provides a method for testing the grid-connected performance of a wind-solar hybrid power generation system based on the operation characteristics of the wind-solar hybrid power generation system, which comprises a test point, a test condition, test contents and a test method for the field test of the wind-solar hybrid power generation system and solves the problem of the field test of the grid-connected performance of the power generation system. The flow chart of the grid-connected performance testing method of the wind-solar hybrid power generation system provided by the invention is shown in FIG. 4:
step 1: determining a test point for field detection of the wind and light combined power generation system:
the test points are different according to the connection mode of the wind-solar combined power generation system.
(1) As shown in fig. 1, the schematic diagram is a simpler wiring manner. The grid-connected test points of 220kV or 110kV grade and 35kV grade are marked in the figure, and the following table lists specific electric quantities to be collected.
TABLE 1 Electrical collection Point for wind-solar hybrid Power System of FIG. 1
| Serial number | Collection point |
| 1 | Main transformer high-voltage side 220kV three-phase voltage |
| 2 | Main transformer high-voltage side 220kV three-phase current |
| 3 | Main transformer low-voltage side 35kV three-phase voltage |
| 4 | Main transformer low-voltage side 35kV three-phase current |
| 5 | Wind power branch grid-connected point 35kV three-phase voltage |
| 6 | Wind power branch grid-connected point 35kV three-phase current |
| 7 | Photovoltaic branch grid-connected point 35kV three-phase voltage |
| 8 | Photovoltaic branch grid-connected point 35kV three-phase current |
(2) As shown in fig. 2, the schematic diagram shows a wiring method with a plurality of photovoltaic power generation branches. Because the performance indexes of a plurality of photovoltaic units to the whole grid-connected point are different, the test points of the connection mode need to be analyzed independently.
Table 2 electrical collection point of wind-solar hybrid power generation system of fig. 2
(3) As shown in fig. 3, this schematic diagram shows a more complex wiring scheme.
TABLE 3 Electrical collection Point for wind-solar hybrid Power System of FIG. 3
| Serial number | Collection point |
| 1 | 220kV three-phase voltage at high-voltage side of first main transformer |
| 2 | 220kV three-phase current at high-voltage side of first main transformer |
| 3 | 35kV three-phase voltage at low-voltage side of first main transformer |
| 4 | 35kV three-phase current at low-voltage side of first main transformer |
| 5 | 35kV three-phase voltage of grid-connected point of first wind power branch |
| 6 | 35kV three-phase current of grid-connected point of first wind power branch |
| 7 | Grid-connected point 35kV three-phase voltage of first photovoltaic branch |
| 8 | Grid-connected point 35kV three-phase current of first photovoltaic branch |
| 9 | 220kV three-phase voltage at high-voltage side of second main transformer |
| 10 | 220kV three-phase current at high-voltage side of second main transformer |
| 11 | 35kV three-phase voltage at low-voltage side of second main transformer |
| 12 | 35kV three-phase current at low-voltage side of second main transformer |
| 13 | 35kV three-phase voltage of second wind power branch grid-connected point |
| 14 | 35kV three-phase current of second wind power branch grid-connected point |
| 15 | Second photovoltaic branch grid-connected point 35kV three-phase voltage |
| 16 | Second photovoltaic branch grid-connected point 35kV three-phase current |
Step 2: determining the test conditions of the scene detection of the wind-solar combined power generation system:
the tested wind-light combined power generation system has stable grid-connected operation capability and has the operation of wind power generation alone, the operation of photovoltaic power generation alone and the operation of wind-light combined power generation. The test requires reasonable wind and light conditions.
And step 3: determining the test content of the scene detection of the wind-solar combined power generation system:
according to the operation characteristics of the wind-solar combined power generation system, the following three operation modes can be tested under the condition of not influencing power generation, and electric energy quality parameters such as flicker, harmonic wave, power change rate and the like are obtained through calculation and analysis according to the collected data:
(1) wind power normal operation, photovoltaic without output (test in the night in the period of no light and wind)
(2) Photovoltaic normal operation, wind power no output (test in daytime with light and no wind)
(3) Wind power and photovoltaic normal operation (testing under the condition of being available in the daytime)
And 4, step 4: the test method for determining the field detection of the wind-solar combined power generation system comprises the following steps: according to the GB/T12326-2008 electric energy quality, voltage fluctuation and flicker, the collected data are calculated and analyzed to obtain flicker, harmonic wave and power change rate electric energy quality parameters, so that the grid connection point performance of the tested wind-light combined power generation system is judged.
The wind power and photovoltaic power generation units in the wind-solar combined power generation system normally operate and are respectively collected, and the sampling frequency is not lower than 4 kHz.
Wind power normally runs and photovoltaic power does not output. The wind power output power is from 0 to 95% of rated power, 10% of rated power is used as an interval, and at least 5 measured values of 10min time sequence instantaneous voltage and instantaneous current values of a wind power plant grid-connected point are collected in each power interval and each phase.
The photovoltaic normally operates, and the wind power does not output power. Starting from the minimum power of the continuous normal operation of the photovoltaic power station, taking 10% of the total rated power of the inverter allocated to the photovoltaic power station as an interval, and respectively measuring data for 10min for 2 times in each interval.
And normally operating wind power and photovoltaic. The wind and light output power is from 0 to 95% of rated power, 10% of rated power is taken as an interval, and at least 5 measured values of 10min time sequence instantaneous voltage and instantaneous current values of a wind power plant grid-connected point are collected in each power interval and each phase.
The invention provides field test contents and a method of a wind-solar combined power generation system, which mainly comprise flicker, harmonic wave, high-frequency components and power control capability. The method has very important significance for improving the standardization and the accuracy of the field test of the wind power combined power generation system.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (3)
1. A method for testing grid-connected performance of a wind and light combined power generation system is characterized by comprising the following steps:
step 1: determining a test point for field test of the wind-solar combined power generation system;
step 2: determining a test condition of field detection of the wind-solar combined power generation system;
and step 3: determining the test content of the scene detection of the wind-solar combined power generation system;
and 4, step 4: testing the grid-connected point performance of the wind-solar combined power generation system;
in the step 2, the test conditions of the field test of the wind-solar hybrid power generation system are as follows: the system has stable grid-connected operation capability, and has wind power independent power generation operation, photovoltaic independent power generation operation and wind-light combined power generation operation; during testing, the wind speed is required to have a working condition of 3-15m/s, so that the output power of the fan is ensured to be in a range of 0-95% of rated power; the light irradiation quantity is required to meet 0-7500MJ/m2Ensuring that the output power of the photovoltaic power station is in a range from 0 to rated power;
in step 3, the test content of the field test of the wind-solar hybrid power generation system includes: according to the operation characteristics of the wind-solar combined power generation system, under the condition of not influencing power generation, the following three operation modes are tested, and through the collected data, flicker, harmonic wave and power change rate electric energy quality parameters are obtained through calculation and analysis:
(1) the wind power normally runs, and the photovoltaic is free of output, namely the test is carried out in the period of no light and wind at night;
(2) the photovoltaic operation is normal, and the wind power does not output power, namely the test is carried out in the time period of light and no wind in the daytime;
(3) normally running wind power and photovoltaic power, namely testing under the condition that wind and light are available at the same time in the daytime;
the step 4 comprises the following steps:
firstly, wind power and photovoltaic power generation units in the wind-solar combined power generation system normally operate and respectively collect the wind power and the photovoltaic power, and the sampling frequency is not lower than 4 kHz;
wind power normally runs, and photovoltaic power does not output: the wind power output power is from 0 to 95% of rated power, 10% of rated power is taken as an interval, and at least measured values of 5 10min time sequence instantaneous voltage and instantaneous current values of a wind power plant grid-connected point are collected in each power interval and each phase;
photovoltaic normal operating, wind-powered electricity generation does not exert oneself: starting from the minimum power of the continuous normal operation of the photovoltaic power station, taking 10% of the total rated power of an inverter allocated to the photovoltaic power station as an interval, and respectively measuring data for 10min for 2 times in each interval;
wind power and photovoltaic normal operation: the wind and light output power is from 0 to 95% of rated power, 10% of rated power is taken as an interval, and at least 5 measured values of 10min time sequence instantaneous voltage and instantaneous current values of a wind power plant grid-connected point are collected in each power interval and each phase.
2. The grid-connected performance test method according to claim 1, wherein in the step 1, the test point is determined according to a connection mode of the wind-solar hybrid power generation system; the method comprises the steps of (1) grid-connected test points of 220kV or 110kV grade and 35kV grade; the electric collection point of the wind-solar combined power generation system comprises: the main transformer high-voltage side 220kV three-phase voltage, the main transformer high-voltage side 220kV three-phase current, the main transformer low-voltage side 35kV three-phase voltage, the main transformer low-voltage side 35kV three-phase current, the wind power branch grid-connected point 35kV three-phase voltage, the wind power branch grid-connected point 35kV three-phase current, the photovoltaic branch grid-connected point 35kV three-phase voltage and the photovoltaic branch grid-connected point 35kV three-phase current.
3. The grid-connection performance test method according to claim 1, wherein the step 4 includes: according to the GB/T12326-2008 electric energy quality, voltage fluctuation and flicker, calculating and analyzing the collected data to obtain flicker, harmonic wave and power change rate electric energy quality parameters, so as to judge the grid-connected point performance of the tested wind-light combined power generation system;
the wind power and photovoltaic power generation units in the wind-solar combined power generation system normally operate and respectively collect the wind power and photovoltaic power generation units, and the sampling frequency is not lower than 4 kHz;
the wind power normally runs, and the photovoltaic power does not output power; the wind power output power is from 0 to 95% of rated power, 10% of rated power is taken as an interval, and at least measured values of 5 10min time sequence instantaneous voltage and instantaneous current values of a wind power plant grid-connected point are collected in each power interval and each phase;
the photovoltaic power generation system normally operates, and the wind power generation system does not output power; starting from the minimum power of the continuous normal operation of the photovoltaic power station, taking 10% of the total rated power of an inverter allocated to the photovoltaic power station as an interval, and respectively measuring data for 10min for 2 times in each interval;
wind power and photovoltaic normally operate; the wind and light output power is from 0 to 95% of rated power, 10% of rated power is taken as an interval, and at least 5 measured values of 10min time sequence instantaneous voltage and instantaneous current values of a wind power plant grid-connected point are collected in each power interval and each phase.
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| CN103278717A (en) * | 2013-05-24 | 2013-09-04 | 北京荣华恒信开关技术有限公司 | New energy integrated grid-connected testing device |
| CN104242446A (en) * | 2014-07-10 | 2014-12-24 | 国家电网公司 | Active distribution network operation monitoring and controlling method for distributed power supplies high in permeability |
| CN104753084A (en) * | 2015-04-01 | 2015-07-01 | 成都鼎智汇科技有限公司 | Micro-grid system capable of controlling frequency automatically |
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