考虑饱和环节的自动发电控制时滞系统串级控制

发布时间：2018-07-03 01:59

本文选题：发电机变化率约束 + 时延　；参考：《电力系统自动化》2017年10期

【摘要】：自动发电控制(AGC)调节过程中存在发电机变化率约束、时延等约束条件,使得基于线性模型的AGC控制策略不能反映真实电力系统的频率调节特性。针对AGC时滞系统同时存在饱和与时延的问题,提出了一种基于内外环比例—积分(PI)稳定域的串级控制系统遗传优化策略。基于AGC系统的负荷频率控制与机组控制组成的串级控制回路,采用Hopf分岔代数判据和时滞系统稳定域理论,分别求取了内外回路的PI稳定域,证明了饱和及时延参数会影响到PI稳定域的变化。通过将稳定域转化为控制器参数优化的约束条件后,对内环优化采用不同指标进行对比,证明了绝对误差积分(IAE)指标对于扰动具有更好的抑制能力;而对外环的对比表明采用时间乘平方误差积分(ITSE)指标具有更小的波动量。遗传优化结果表明所提控制策略能够有效抑制饱和及时延环节对系统性能的影响。
[Abstract]:In the process of automatic generation control (AGC) regulation, there are constraints of generator change rate and delay, which makes the AGC control strategy based on linear model cannot reflect the frequency regulation characteristics of real power system. In view of the problem of saturation and delay in AGC time-delay systems, a kind of internal and external loop proportional integral (PI) stability is proposed. The genetic optimization strategy of the cascade control system in the domain is based on the cascade control loop of the load frequency control and the unit control of the AGC system. The Hopf bifurcation algebraic criterion and the time-delay system stability domain theory are used to obtain the PI stable domain of the internal and external loops respectively. It is proved that the saturation time delay parameters will affect the change of the PI stable domain. When the domain is transformed into the constraint condition of the controller parameter optimization, the internal loop optimization is compared with different indexes. It is proved that the absolute error integral (IAE) index has a better suppression ability for the disturbance; while the contrast of the outer ring indicates that the time multiplication square error integral (ITSE) index has smaller fluctuation. The proposed control strategy can effectively suppress the influence of saturation and delay loop on system performance.
【作者单位】：北京交通大学机械与电子控制工程学院;
【基金】：国家自然科学基金资助项目(61074104)~~
【分类号】：TM712;TM73

【相似文献】