离网运行的风能海水淡化系统负荷控制策略  

Load Control Strategy of Wind Energy Seawater Desalination System Powered by Off-grid Distribution

作　　者：武耀勇 张玮[1] 赵丽霞[1] 胡静[1] 刘锐[1] 

机构地区：[1]中国电力工程顾问集团华北电力设计院工程有限公司,北京市100120

出　　处：《电力建设》2015年第3期109-113,共5页Electric Power Construction

基　　金：国家能源应用技术研究及工程示范项目(NY20110207-1)

摘　　要：在由风力发电机和储能装置作为海水淡化装置供电电源的离网型配电系统中,为最大化利用风能并减少配电系统对储能装置容量的依赖,海水淡化装置负荷采用功率阶梯调节和功率平滑调节相结合的方式,储能装置采用V/f控制。功率阶梯调节通过海水淡化装置的模块化投切实现;功率平滑调节通过变频器实现电动机的变频调速,并且利用变频器的软启动功能和无功输出能力有效维持配电系统的电压稳定。基于上述控制策略,通过PSCAD仿真软件建立动态负荷模型进行仿真计算并结合负荷实验数据进行分析。仿真和实验结果均表明,该控制策略可以实现海水淡化负荷对风力发电输出功率的有效跟踪,能够很好地适应风电波动性,并充分利用了风力发电机的输出功率,减少了对储能装置容量的依赖,提高了全系统运行的稳定性和经济性。In the off-grid power distribution system which is powered by wind power generator and uses energy storage device as power source of seawater desalination device, in order to maximize the use of wind energy and reduce the dependence of distribution system on the capacity of energy storage device, the seawater desalination device adopts the power regulation mode combined with stair-like and smooth tactics, and the energy storage device adopts V/f control. Further, the stair-like power regulation mode is implemented by dividing the load operation into conditions. The smooth power regulation mode adopts frequency converter to change the speed of motor, and uses its characteristics of soft start and reactive power output to effectively maintain the voltage stability of distribution system. Based on the control strategy above, the calculation was processed through a dynamic load model which was established in PSCAD simulation software, and analyzed combined with the load test data. The results of both simulation and experiment show that, the control strategy can achieve effective tracking of wind energy output power for seawater desalination system; finely adapt to the dynamic of wind waves; make full use of the wind generator output power; reduce the dependence on the capacity of energy storage device; and improve the stability and economy of the operation of whole system.

关 键 词：海水淡化 离网型配电系统 储能装置 变频器 恒压频比控制 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程]