共查询到19条相似文献，搜索用时 187 毫秒
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针对农村中压配电网无功损失较为严重的现象,研究了农村中压电网无功补偿优化问题,寻找满足电压质量要求和线损最小条件下农村中压电网无功补偿装置的最佳安装位置和最佳补偿容量。在研究农村中压电网结构特点的基础上,提出了简便、有效的优化算法。算法以无功补偿的最佳位置和最佳容量为目标,考虑了网损最小、电压质量和综合经济性等多目标优化约束条件。 相似文献
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电力系统的无功优化和无功补偿是减小网损、提高系统运行电压和系统稳定水平的有效手段,因此也是电力系统研究的主要方向之一。对当前国内外的无功优化和无功补偿进行了总结,并对目前无功补偿和优化存在的问题进行了一定的探讨和研究。 相似文献
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电力系统的无功优化和无功补偿是减小网损、提高系统运行电压和系统稳定水平的有效手段,因此也是电力系统研究的主要方向之一。对当前国内外的无功优化和无功补偿进行了总结,并对目前无功补偿和优化存在的问题进行了一定的探讨和研究。 相似文献
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在大力推行无功补偿的前提下,电力系统的无功优化是提高系统运行电压,减小网损,提高系统稳定水平的有效手段。本文从无功补偿的原则、补偿点的优化、补偿容量的选择方面,对农村10kV配电网络无功补偿的优化问题进行了一定的研究和探讨。 相似文献
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电力系统的无功优化和无功补偿是减小网损、提高系统运行电压和系统稳定水平的有效手段，因此也是电力系统研究的主要方向之一。对当前国内外的无功优化和无功补偿进行了总结，并对目前无功补偿和优化存在的问题进行了一定的探讨和研究。 相似文献
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为了确保输配电网系统的正常运行,提高有功功率的利用率,有效地控制电损,一般选择在低压配电网中安装电容器无功补偿装置。伴随国家科学技术的进步,市面上涌现了各种各样的无功补偿装置,让油田电网的节能效益更为显著。基于此,阐述了无功功率对油田电网的影响,列举了几种常见的油田电网无功补偿方式,探讨了油田电网无功补偿优化措施。 相似文献
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针对电力系统无功优化的特点,主要完成的工作是建立了通用的数学模型,以有功网损最小为目标函数,以电压质量和无功补偿为罚函数约束,以变压器分接头数、离散调节的补偿电容器组数和变压器机端电压为控制变量,节点电压和无功补偿容量为状态变量,采用遗传算法,利用Matlab软件编程,对IEEE14节点系统仿真,实现了无功优化,证明了本设计的正确性和有效性。 相似文献
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《Journal of The Franklin Institute》2022,359(2):859-869
In this paper, we considered a time-optimal control problem for a new type of linear parameter varying (LPV) system which is obtained through data identification in the process of dealing with actual problems. The addition of non-linear terms is compensation for the method that does not require linear expansion at the equilibrium point. Since the objective function is the terminal time which is an implicit function concerning decision variables, it is a non-standard optimal control problem with uncertain terminal time. To find the global optimal solution to this problem, firstly, the control parameterization method is used to transform it into a nonlinear optimization problem of parameter selection, and then the modifed particle swarm optimization (PSO) algorithm is combined to solve the equivalent nonlinear programming problem. Numerical examples are used to illustrate the effectiveness of the proposed algorithm. 相似文献
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无功补偿在电力系统中起到提高功率因数的作用,合理地使用无功补偿设备,可降低设备和线路的损耗,对调整电网电压,提高供电质量,抑制谐波干扰,保证电网安全稳定的运行具有十分重要的作用。本文从电力无功补偿的基本原理、无功不足的危害、补偿方式、运行管理及实际应用几个方面进行分析,阐述了无功补偿在电力电网中应用的意义和作用。 相似文献
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为了实现变电站内无功电压优化控制,提出了采用禁忌搜索算法进行无功电压优化控制问题的求解。以最大限度地降低功率损耗、提高电压质量和减少变压器的调节次数及电容器组的投切次数为目标,建立了相应的数学模型,并考虑系统潮流、控制变量、状态变量、器件动作次数的约束条件。采用数值仿真的方法进行了验证,仿真结果表明提出的方法可以得到最优解,解的质量较高。 相似文献
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The attitude tracking control problem for a rigid spacecraft using two optimal sliding mode control laws is addressed. Integral sliding mode (ISM) control is applied to combine the first-order sliding mode with optimal control and is applied to quaternion-based spacecraft attitude tracking maneuvres with external disturbances and an uncertainty inertia matrix. For the optimal control part the control Lyapunov function (CLF) approach is used to solve the infinite-time nonlinear optimal control problem, whereas the Lyapunov optimizing control (LOC) method is applied to solve the finite-time nonlinear optimal control problem. The second method of Lyapunov is used to show that tracking is achieved globally. An example of multiaxial attitude tracking maneuvres is presented and simulation results are included to demonstrate and verify the usefulness of the proposed controllers. 相似文献
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《Journal of The Franklin Institute》2002,339(4-5):479-498
In this paper, a numerical method to solve nonlinear optimal control problems with terminal state constraints, control inequality constraints and simple bounds on the state variables, is presented. The method converts the optimal control problem into a sequence of quadratic programming problems. To this end, the quasilinearization method is used to replace the nonlinear optimal control problem with a sequence of constrained linear-quadratic optimal control problems, then each of the state variables is approximated by a finite length Chebyshev series with unknown parameters. The method gives the information of the quadratic programming problem explicitly (The Hessian, the gradient of the cost function and the Jacobian of the constraints). To show the effectiveness of the proposed method, the simulation results of two constrained nonlinear optimal control problems are presented. 相似文献
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The optimal location of a static synchronous compensator (STATCOM) and its coordinated design with power system stabilizers (PSSs) for power system stability improvement are presented in this paper. First, the location of STATCOM to improve transient stability is formulated as an optimization problem and particle swarm optimization (PSO) is employed to search for its optimal location. Then, coordinated design problem of STATCOM-based controller with multiple PSS is formulated as an optimization problem and optimal controller parameters are obtained using PSO. A two-area test system is used to show the effectiveness of the proposed approach for determining the optimal location and controller parameters for power system stability improvement. The nonlinear simulation results show that optimally located STATCOM improves the transient stability and coordinated design of STATCOM-based controller and PSSs improve greatly the system damping. Finally, the coordinated design problem is extended to a four-machine two-area system and the results show that the inter-area and local modes of oscillations are well damped with the proposed PSO-optimized controllers. 相似文献
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本文从10KV供电线路进行无功补偿的必要性出发.介绍了无功补偿的原理和意义,详述了LHGW10KV无功自动补偿系统的原理、结构性能、安装调试及常见故障的排除方法. 相似文献