由基于虚拟同步发电机（VSG）控制策略的双馈发电机（DFIG-VSG）组成的风电场在响应电网功率指令值（Pgrid）变化时,会加剧风电场内各台DFIG-VSG的主轴疲劳载荷。风电场中央控制器通过合理地将Pgrid分配至各台DFIG-VSG,可使得风电场在响应Pgrid变化的同时,降低场内各台DFIG-VSG的Ms疲劳载荷。为此,提出了一种计及主轴疲劳载荷的风电场有功功率分配方法。首先,构建可量化表示场内单台DFIG-VSG的有功功率指令值与其主轴力矩（Ms_T）之间关系的离散化方程。然后,基于该离散化方程,在中央控制器中以各台DFIG-VSG的Ms_T波动总和最小作为目标函数,并根据Pgrid以及各台DFIG-VSG的运行状态设定有功功率约束条件。最后,基于中央控制器中的fmincon算法实时分配各台DFIG-VSG所需的有功功率指令值。仿真结果验证了所提出的分配方法的有效性及优越性。
Abstract
The wind farm composed of doubly fed induction generator （DFIG-VSG） based on virtual synchronous generator control strategy （VSG） will exacerbate the main shaft （Ms） fatigue load of each DFIG-VSG in the wind farm when responding to changes in the grid power command value （Pgrid）. The central controller of the wind farm can reasonably allocate Pgrid to each DFIG-VSG in, which can reduce the Ms fatigue load of each DFIG-VSG in the wind farm while responding to Pgrid changes. A wind farm active power allocation method that takes into account main shaft fatigue load is proposed for this purpose. Firstly, construct a discretized equation that quantifies the relationship between the active power command value of a single DFIG-VSG in the field and its main shaft torque （Ms_T）. Then, based on this discretization equation, the Ms of each DFIG-VSG minimized as the objective function and active power constraints are based on the operating status of Pgrid and each DFIG-VSG. Finally, based on the fmincon function in the central controller, real-time allocation of active power command values required by each DFIG-VSG is performed. The simulation results have verified the effectiveness and superiority of the proposed allocation method.
关键词
风电场 /
虚拟同步发电机 /
主轴疲劳载荷 /
有功功率分配方法
Key words
wind farm /
virtual synchronous generator /
main shaft fatigue load /
active power allocation method
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基金
揭榜挂帅科技攻关专项（2021020545-JH1/104）
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