A combined optimization method for photovoltaic power plant group control
A photovoltaic power station and combination optimization technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., can solve the problems of inverter efficiency drop and photovoltaic array output power reduction.
Inactive Publication Date: 2014-10-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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At present, the construction of large-scale grid-connected photovoltaic power plants is an effective way to use solar energy intensively. However, due to the inherent intermittent and fluctuating nature of photovoltaic power generation, when the light is weak, the output power of photovoltaic arrays decreases, which significantly reduces the efficiency of the inverter. And when the group control technology is introduced, the efficiency of the inverter group can be improved to a certain extent
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[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following will be combined with the attached figure 1 The design flow chart of the combination method of photovoltaic power station inverter group is shown, and it is described. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.
[0026] Step 1: Obtain the conversion efficiency curve of the inverter of the photovoltaic power station. For different combinations of inverters, use the exhaustive efficiency method to obtain its European efficiency, and then obtain the maximum feasible number of inverters by analyzing the degree of improvement in European efficiency.
[0027] Obtain the conversion efficiency curves of different types of inverters involved in each combination mode. If it cannot be measured, the conversion efficiency curve of the inverter can be approximated by curve ...
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The invention discloses a photovoltaic power station group control combinatorial optimization method and belongs to the technical field of photovoltaic power generation. The method includes the following steps: a conversion efficiency curve of photovoltaic power station inverters is acquired, for different inverter number combinations of the inverters, European efficiency of the inverter number combinations is figured out by using of an efficiency exhaustion method, and then the maximum practicable number of the inverters is acquired according to analysis on European efficiency improvement degrees; various group control units meeting the maximum practicable number of the inverters are formed; combination modes of the group control units are formed according to requirements of photovoltaic power station capacity; and for the different combination modes of the group control units, the European efficiency of the different combination modes is figured out by using the efficiency exhaustion method, and a selectable optimized combination is acquired. The photovoltaic power station group control combinatorial optimization method has the advantage that scientific basis can be supplied to correct understanding of the relations between group control system efficiency improvement and investment and technology difficulty, and rational choice of the optimal combination mode of the group control units.
Description
technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a group control combination optimization method for photovoltaic power stations. Background technique [0002] Photovoltaic group control technology refers to the electrical connection of multiple photovoltaic grid-connected inverters on the DC side or AC side with a certain topology, and coordinates the control of each inverter to improve the efficiency of the inverter group at low power output. method. At present, the construction of large-scale grid-connected photovoltaic power plants is an effective way to utilize solar energy intensively. However, due to the inherent intermittency and volatility of photovoltaic power generation, when the light is weak, the output power of the photovoltaic array decreases, which significantly reduces the efficiency of the inverter. And when the group control technology is introduced, the efficiency of the in...
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IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 徐永海孔祥雨曾雅文陶顺肖湘宁
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)