液压式波浪能装置发电控制策略试验研究

EXPERIMENTAL STUDY ON POWER GENERATION CONTROL STRATEGY OF HYDRAULICWAVE ENERGY CONVERTER

以一套含有多个发电机组的波浪能发电装置液压系统样机为研究对象,介绍系统组成及运行原理,并通过研发的液压测试平台对两种发电控制策略开展试验研究。首先,对流量控制阀变开度发电控制策略开展试验,结果表明采用该策略可使输出电压在一段时间内趋于稳定,提高发电质量,同时提出两种基于液压测试平台获取比例流量控制阀有效输入电信号的方法。其次,通过在液压系统样机输出端接入多个发电机组实现梯度发电控制策略,数据结果证实可有效提高瞬时输出功率,提升波浪能发电装置在不同波况下的自适应性,同时对在实海况中实现该控制策略的条件进行初步讨论。

Taking the hydraulic system of a wave energy converter(WEC)with several generators as the research object,the composition and working principle of the hydraulic system are introduced,and the experimental study on two power generation control strategies are carried out through the self-made hydraulic test platform.The power generation control strategy of changing the opening of flow control valve is first tested.The results show that using this control strategy can stabilize the output voltage for a period of time and improve the power generation quality.Two methods based on hydraulic test platform to obtain the effective input electrical signal of the proportional flow control valve are also proposed.Secondly,the gradient power generation control strategy is realized by connecting generator sets to the output end of the hydraulic system.The data results confirm that the gradient power generation control strategy can effectively improve the instantaneous output power and enhance the adaptability of the WEC under different wave conditions.The conditions for realizing this control strategy in actual sea conditions are discussed preliminary.