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薛国清 《电网与水力发电进展》2022,38(2):42-47
针对现有电网多目标调度模型未对智能化电网电源的能耗和出力情况进行分析而导致调度成本较高等问题,提出一种基于反馈控制的智能化电网多目标协同调度模型。优先分析智能化电网中电源的能源消耗和出力使用情况,利用反馈控制策略制定电网运行约束条件;同时,将最低经济成本和最小环境污染度作为目标函数,构建智能化电网多目标协同调度模型。采用改进粒子群算法对调度模型进行求解,最终获得最佳的协同调度方案。经实验测试,所提模型不仅能够有效降低调度成本,而且提升了环境污染系数,降低了对环境的影响程度。 相似文献
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Younkins T.D. Winkelman J.R. Sanchez-Gasca J.J. McGrady J.A. 《Energy Conversion, IEEE Transaction on》1987,(3):349-354
This paper presents a preliminary design of an Output Feedback Multivariable Control for use on an ABWR. Although the design is simple and compact, it meets all the major control requirements for use in load following and frequency regulation in a utility power system. The Multivariable Control coordinates three out of four controls with four measurements and integrals of two of these measurements. The design features dynamic control structure switching with a constant gain matrix; recirculation flow is varied above 70% load demand, while control rods are varied below 70% load demand. This paper describes the 23 state model that was used, the Multivariable Control design, and the nonlinear time domain performance of an ABWR with the Multivariable Control. 相似文献
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本文阐述了机油泵限压阀工作压力的两种不同的反馈调节方式,并通过试验分析不同的限压阀工作压力反馈方式的发动机机油压力分布规律,总结出机油泵限压阀采用主油道机油压力反馈控制,发动机高速运转时的主油道机油压力受机油温度和油道阻力影响小,机油压力更加稳定,能够对发动机主油道机油压力实施精确的控制,特别是对发动机低温运行工况机油压力过高和旧机油滤清器机油压力过低有很大改善. 相似文献
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针对超临界直流锅炉在变负荷运行过程中被控对象参数不断发生变化的特点,将超临界直流锅炉看做具有不确定性的非线性系统,并根据部分分散控制方法对某600MW超临界机组简化模型进行了分析,充分论证了燃料量对中间点温度的动态特性单独建模的合理性.以超临界直流锅炉燃料量变化对水冷壁出口温度的影响为研究对象,进行动态机理分析并建立动态模型,通过计算在3个典型工况点处的传递函数,确定其不确定性模型的参数变化范围.将定量反馈理论应用到煤水比控制中,结合给定的设计性能指标计算出煤水比控制系统的反馈控制器和前置滤波器的参数.结果表明:锅炉中间点温度在不同负荷下都能较快地高精度跟踪给定信号,有较强的鲁棒性,控制性能良好且易于实现. 相似文献
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In this article, a meshless numerical algorithm is proposed for the boundary identification problem of heat conduction, one kind of inverse problem. In the geometry boundary identification problem, the Cauchy data is given for part of the boundary. The Neumann boundary condition is given for the other portion of the boundary, whose spatial position is unknown. In order to stably solve the inverse problem, the modified collocation Trefftz method, a promising boundary-type meshless method, is adopted for discretizing this problem. Since the spatial position for part of the boundary is unknown, the numerical discretization results in a system of nonlinear algebraic equations (NAEs). Then, the exponentially convergent scalar homotopy algorithm (ECSHA) is used to efficiently obtain the convergent solution of the system of NAEs. The ECSHA is insensitive to the initial guess of the evolutionary process. In addition, the efficiency of the computation is greatly improved, since calculation of the inverse of the Jacobian matrix can be avoided. Four numerical examples are provided to validate the proposed meshless scheme. In addition, some factors that might influence the performance of the proposed scheme are examined through a series of numerical experiments. The stability of the proposed scheme can be proven by adding some noise to the boundary conditions. 相似文献
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基于转矩的发动机管理系统将转矩控制转化为进气控制,从物理背景出发推导出进气系统的模型,基于该模型提出带前馈的进气压力(proportional and integral,PI)反馈控制方法。针对某汽油机,进行了进气模型参数辨识,并对控制方法进行了试验验证。同时进行了基于Map图前馈的反馈控制试验,并进行了相对比较。结果表明:基于模型前馈的进气压力反馈控制与基于Map前馈的反馈控制性能相近,但前者只需较少的标定数据量。 相似文献
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低压微电网逆变器的等效输出阻抗受线路参数影响会呈现出阻性,而传统下垂控制是基于感性阻抗为前提,直接用于低压微电网逆变器控制达不到频率和电压的控制要求。在分析了传统下垂控制法和逆变器等效输出阻抗对系统影响的基础上,提出了引入反馈感性阻抗的电压电流双环控制。反馈感性阻抗的引入使逆变器等效输出阻抗为感性,可以正确体现P-f、Q-V动态下垂控制特性,并且在并/离网运行模式变化时不用切换控制策略。通过在PSCAD中建立风光储微电网仿真模型,分析了并/离网和负荷突变的仿真结果,验证了控制策略的有效性和正确性。 相似文献
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将输入输出反馈精确线性化控制方法应用于三相有源电力滤波器非线性控制中。首先建立三相有源电力滤波器的仿射非线性系统模型,推导出了其输入输出反馈精确线性化非线性反馈控制律,实现三相并联型有源电力滤波器有功补偿电流和无功补偿电流的解耦控制器设计。最后使用Matlab进行仿真验证,仿真试验结果表明,该控制策略能较好地实现APF的解耦控制,具有较好的补偿特性,经该控制算法补偿,谐波畸变率限制在2%以下。 相似文献
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Boumediène Chentouf 《Journal of Dynamical and Control Systems》2003,9(2):201-232
This paper deals with the boundary feedback stabilization of a variant of the SCOLE model, namely, a flexible beam clamped at one end, and free at the other end where a rigid body is attached. Using the frequency domain method, we first prove that the considered system is uniformly stabilizable if the control force and control moment are simultaneously applied at the free end of the beam. Secondly, if only a control force is applied, we give a sufficient condition on the physical parameters of the system to guarantee the uniform stabilization. Finally, it is shown that the presence of boundary control force is necessary to achieve the uniform stabilization. To verify these theoretical developments, an asymptotic analysis and numerical study of the spectrum are performed. 相似文献
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In this article we consider the system of generalized thermoelasticity under Green–Lindsay model in one dimension with Dirichlet–Neumann boundary conditions. First, the roots of the characteristic polynomial are investigated by applying an approach based on the implicit function theorem. Then we prove the exponential decay of the associated energy and describe the optimal decay rate. The numerical calculation of the corresponding characteristic roots is done for different real materials. Then another approach based on Hurwitz criterion is applied to obtain the decay rate analytically. Finally, we present a discussion of the decay rate given by both approaches, as well as a comparison with already-existing results for Lord–Shulman and classical models of thermoelasticity. 相似文献
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采用Simulink建立了喷油器电磁阀的数学模型,根据电流反馈控制思路开展喷油器驱动控制技术研究。设计了电流反馈控制型高低压分时驱动电路,并采用Multisim软件对该驱动电路进行仿真。仿真结果表明:该电路可通过峰值电流、维持电流反馈回路自动控制驱动电流的大小。针对某型喷油器进行了驱动试验,结果表明:喷油器电磁阀模型准确,电流反馈控制驱动电路性能优良。 相似文献
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