Smoothing method for power fluctuation of offshore renewable energy source integrated power generation system
A technology for renewable energy and power generation systems, applied in the direction of reducing/preventing power oscillations, etc., can solve the problems of high cost of energy storage equipment and increased construction costs, and achieve the goal of stabilizing system output power fluctuations, reducing construction costs, and improving power quality Effect
Active Publication Date: 2013-12-11
HOHAI UNIV
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However, the current cost of energy storage equipment is high, adding energy storage equipment will inevitably lead to a substantial increase in the entire construction cost
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[0019] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:
[0020] The electrical topology and control strategy of offshore renewable energy integrated power generation system are as follows: figure 1 As shown, offshore wind power, wave power generation and tidal current power generation all use direct-drive permanent magnet generators, which are connected in parallel to the internal DC bus of the integrated power generation system through three IGBT-based PWM converters, and the DC bus is connected to the shore through submarine cables. The PWM inverter is finally connected to the power grid through a step-up transformer. The controller of the system consists of three generator-side controllers and grid-side controllers, all of which adopt decoupling control strategies. The goal of the offshore wind power and wave energy generator side controller is to realize the maximum power tracking of wind energy and wave energy; th...
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The invention discloses a smoothing method for power fluctuation of an offshore renewable energy source integrated power generation system, and belongs to the technical field of renewable energy power generation. On the premise of comprehensively utilizing offshore wind energy, wave energy and tidal current energy to generate power, energy storage equipment is not added, and system output power fluctuation is stabilized through a tidal current energy power generation device in the offshore renewable energy source integrated power generation system. In the computational process of introducing a power fluctuation quantity into a tidal current energy generator set output power reference value, according to the regular feature of tidal current flowing speed, when the tidal current flowing speed is higher than a starting flowing speed, a tidal current energy generator set operates in a load shedding mode under the action of a machine side controller, and fluctuating power is compensated. When the tidal current flowing speed is lower than the starting flowing speed, the tidal current generator set operates as a flywheel energy storage device, and the fluctuating power is compensated. On the one hand, the method can lower construction cost. On the other hand, the quality of electric energy output by the integrated power generation system is improved, and the operating performance of the power grid of the offshore renewable energy source integrated power generation system is improved.
Description
technical field [0001] The invention discloses a method for smoothing power fluctuations of an offshore renewable energy comprehensive power generation system, and belongs to the technical field of renewable energy power generation. Background technique [0002] The ocean covers 70% of the earth's surface and contains infinite energy. It is estimated that the sum of its energy greatly exceeds the current global energy demand. Because the deep sea is usually far away from the continent, it is difficult to use deep sea energy under the existing technical conditions, so the available ocean energy is mainly distributed in the offshore. Offshore energy is clean and renewable energy, and its scientific development and utilization are of great significance to alleviate energy crisis and environmental pollution. [0003] The offshore renewable energy integrated power generation system integrates offshore wind power, wave power generation and tidal current power generation. The thre...
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Inventor 秦川鞠平吴峰闻丹银王荃荃
Owner HOHAI UNIV