共查询到20条相似文献,搜索用时 46 毫秒
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针对采用虚拟同步发电机技术(Virtual synchronous generator,VSG)控制的新能源并网逆变器,提出一种基于统一模型的VSG实际输出惯性和阻尼的辨识方法,定量评估逆变器提供给大电网的惯性和阻尼。首先分析不同的VSG接建模方法,建立统一的VSG控制模型结构,然后提出一种适用于时域的多新息随机梯度法VSG关键参数的辨识方法,利用指令功率阶跃激励出系统功率动态信息,根据所推导的VSG控制模型参数之间的关系,动态地辨识出系统输出的惯性和等效阻尼参数,然后分析辨识模型的误差。最后,通过仿真验证与对比证明所提方法的有效性。 相似文献
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永磁直驱风力发电机(D-PMSG)通过双PWM全功率变流器实现和电网的连接,但在其运行过程中,网侧变流器的参数变化会对其控制性能造成影响,精确辨识网侧变流器参数对于提升发电系统控制性能具有重要意义。文章基于网侧变流器在d-q轴的动态方程,构建了网侧变流器的回归模型,设计了网侧变流器电气参数的带收敛因子的多新息遗忘随机梯度辨识算法,实现网侧变流器的电气参数辨识,并通过仿真实验验证了算法的有效性。 相似文献
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变压器铁心磁滞特性的准确预测及其模型参数可靠辨识,一直是国内外学者们研究的难点问题。针对现有主流磁化(Jile-Atherton,J-A)模型存在的辨识参量多、计算时间长、容易陷入局部最优解等问题,提出一种基于收缩因子改进粒子群优化(Particle swarm optimization,PSO)算法的J-A磁滞模型参数辨识方法。研究建立以磁感应强度为输入变量的J-A静态磁滞逆模型,提出考虑包含涡流损耗、异常损耗因素下的动态磁滞模型;针对传统PSO算法计算精度低、不易于快速寻优的问题,提出基于收缩因子改进的PSO优化算法,可实现J-A磁滞模型关键参量的快速辨识。所提算法克服了传统粒子飞行速度的限制,兼具全局寻优和局部寻优的特点,易于实现J-A磁致模型的快速参数辨识。通过仿真算例分析,验证了所提改进PSO算法在不同磁密峰值工况下的应用可靠性,且迭代收敛速度和精度均优于传统PSO算法。 相似文献
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针对粒子群(PSO)优化算法辨识发电机模型参数时存在局部最优和后期收敛速度慢很难准确获取具有强泛化能力的模型参数的问题,提出了一种基于多粒子全局信息共享和变权重的全局信息融合PSO算法(GPSO),并通过IEEE3机9节点系统算例验证了该算法的有效性。结果表明,与常规PSO算法相比,该算法具有泛化能力强、辨识精度高和后期收敛速度快的优点。 相似文献
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针对弧形闸门模态参数测试过程中存在的计算误差及环境激励干扰导致的虚假模态等问题,提出改进随机子空间法,即在弧形闸门模态参数辨识过程中引进随机子空间法,并利用时频分布——Gabor展开作为数据前处理,采用特征参数随数据量增加而变化的稳定图有效区分了物理模态和虚假特征,剔除虚假模态,辨识弱小特征,提高了辨识精度。以某水电站泄洪表孔弧形闸门为例进行模态参数辨识,并与有限元结果进行比较。结果表明,改进随机子空间法辨识结果与有限元数值分析结果吻合较好,可见所提方法可行、有效。 相似文献
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基于果蝇优化算法的汽轮机调节系统参数辨识 总被引:1,自引:0,他引:1
《动力工程学报》2015,(7):556-561
为了建立用于电力系统稳定计算的汽轮机调节系统的准确模型,通过现场试验的方法得到某电厂试验数据并进行了相关预处理,采用果蝇优化算法对该电厂汽轮机调节系统各环节的参数进行辨识,最后对辨识结果进行仿真校核,给出仿真曲线与实测曲线的对比结果,并计算出各误差指标.结果表明:所采用的果蝇优化算法适用于汽轮机调节系统参数辨识,经过仿真校核得到的模型与机组实际特性趋于一致,验证了该方法的实用有效性. 相似文献
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Finite-element calculation of leakage inductances of a saturated salient-pole synchronous machine with damper circuits 总被引:4,自引:0,他引:4
It is important to understand the relationship between leakage flux distributions and machine characteristics for better design of synchronous machines. This paper presents a calculation method for leakage inductances of saturated salient-pole machines with damper circuits. All leakage inductances are divided into the self-leakage, gap leakage, and winding-differential leakage inductances. The leakage inductances correspond directly to the leakage flux distributions in the machines. Cross-magnetizing inductances are also calculated. The method is applied to a 300-MVA class generator. The relationship between the winding distributions, flux distributions, saturation, and inductances is discussed. Weak magnetic influence of the damper circuits on the armature in the d-axis is quantitatively illustrated through values of the winding-differential leakage inductances. The cross-magnetizing inductances, except for the d-axis damper circuits, are relatively large. Variations of the armature self-leakage inductances with saturation are small, and variations of the field and damper self-leakage inductances are larger. 相似文献
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《International Journal of Hydrogen Energy》2023,48(45):17277-17292
This study represents a comparison of novel robust adaptive sliding mode control using stochastic gradient descent (ASMCSGD) versus the super twisting algorithm (STA) for the proton exchange membrane fuel cell (PEMFC) power system. PEMFC has been constantly encountered with external disturbances such as inlet gas pressures and temperature fluctuations which a novel adaptive control law should be designed to be robust against the mentioned perturbations. The proposed ASMCSGD is based on the conventional sliding mode control (SMC), which guarantees robustness and restraining external disturbances. As is common, the main drawback of conventional SMC is the generation of a chattering phenomenon. Therefore, by using the stochastic gradient descent (SGD), a novel adaptive control law is designed. Hence, the SGD can continuously calculate the adaptive gain and then guarantee robustness besides minimizing the chattering phenomenon. The stability of the PEMFC power system for both controllers ASMCSGD and STA is demonstrated via the Lyapunov theorem. Simulation results have been studied and illustrate the effectiveness of the proposed controller successfully using Matlab/Simulink. 相似文献
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This study proposes a wind farm active power dispatching(WFAPD) algorithm based on the grey incidence method, which does not rely on an accurate mathematical model of wind turbines. Based on the wind turbine start-stop data at different wind speeds, the weighting coefficients, which are the participation degrees of a variable speed system and a variable pitch system in power regulation, are obtained using the grey incidence method. The incidence coefficient curve is fitted by the B-spline functi... 相似文献
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依据能源枢纽作为多能源系统的联系载体,建立了一个通用的优化建模框架,用于不同能源耦合系统的最优潮流研究。根据建立的优化建模框架,将综合能源系统的最优潮流问题解耦,得到一系列独立的传统最优潮流问题,从而使得问题易于求解。综合能源系统的最优潮流问题是一个大规模的非线性问题,将多主体进化算法应用于求解中,从而保证能够得到的全局最优解,适用于大型的复杂的多能源系统。通过包含有多个能源枢纽的综合能源系统的仿真分析,验证了该模型的有效性。 相似文献
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