基于电磁耦合的电网定向电压励磁自适应调控

Adaptive Control of Directional Voltage Excitation of Power Grid Based on Electromagnetic Coupling

针对常规的电网定向电压励磁线性调控方法在发电机组单机容量比较大的情况下,易受某些不确定因素的影响使系统参数不准确,导致延长电压上升时间。因此,设计一种基于电磁耦合的电网定向电压励磁自适应调控方法。首先建立励磁系统传递、比较电路、整流滤波电路、补偿电路的数学模型,将这些模型共同组合完成水电机组励磁数学模型的建立,将永磁同步发电机与普通电励磁电机相结合,设计励磁定子结构,根据励磁电流的值分析气隙磁场,完成电磁耦合结构的设计,最后通过改变蚁群算法的初始值,调整节点聚度与能见度,完成励磁调节器的优化。为了验证设计的调控方法具有一定有效性,以某电厂为模型设计仿真实验。实验结果表明,设计的调控方法各项性能均达到要求,且调控的阻尼比更大,电压恢复较快。

Under the condition of large capacity of single generator unit,the conventional linear control method of directional voltage excitation in power grid is easy to be affected by some uncertain factors,which makes the system parameters inaccurate and leads to the extension of voltage rise time.Therefore,an adaptive control method of directional voltage excitation based on electromagnetic coupling is designed.Excitation system is established by the transmission,comparison circuit,rectifier filter circuit,compensation circuit and the mathematical model of hydropower unit excitation.These models are combined together to establish a mathematical model,the permanent magnet synchronous generator is combined with general electric excitation motor,stator structure design field is designed according to the air-gap magnetic field excitation current value analysis,the design of electromagnetic coupling structure is completed.Finally through changing the initial value of Ant Colony Algorithm,the cluster nodes and visibility are adjusted to complete the optimization of excitation regulator.In order to verify the effectiveness of the designed control method,a simulation experiment is designed with a power plant as a model.The results show that the performance of the designed control method meets the requirements,and the damping ratio of control is larger and the voltage recovery is faster.