【作者】 毕兆东；

【导师】 韩祯祥；

【作者基本信息】 浙江大学 ， 电力系统及其自动化， 2002， 博士

【摘要】 安全稳定控制作为故障后维持系统正常运行的有效手段受到了越来越多的重视。本文在总结前人研究成果的基础上，对电力系统暂态稳定紧急控制决策的计算过程进行了较为深入的研究。 提出了一种运行方式集自动生成算法，只需给出相应的参数，就可通过约束潮流计算得到系统负荷随机变化后，满足节点电压、无功及输电线路功率约束，能够覆盖实际系统各种运行方式的预想运行方式集。在此基础上，进一步提出了快速自动生成策略表的算法，该算法不仅可以应用于“在线预决策，实时匹配”系统中的在线策略表的生成，还可以应用于自动生成离线策略表。 采用基于进化理论的粒子群游算法求解约束潮流，通过对原有的算法按照约束潮流所具有的特点进行改进，其计算速度和收敛稳定性有了非常明显的提高，完全可以用于实际系统的求解。 建立了暂态稳定最优切负荷控制的数学模型，该模型以总切负荷量最小为目标，以暂态功角稳定为约束条件。然后给出了该稳定约束函数相对于切负荷控制量的灵敏度计算公式，并在此基础上提出一种新的、完全基于数值积分法的切负荷算法。由于求解一次所有控制量灵敏度的计算量只相当于计算2次暂态稳定，该算法能快速地计算出能够使系统保持稳定的切负荷量。此外，该算法还具有原理简单、控制效果好等特点。 使用切机控制验证切负荷算法中介绍的梯度和灵敏度算法的可扩展性，并根据切机控制所具有的特点对快速切负荷算法进行修改，提出一种基于数值积分法灵敏度的快速切机控制决策算法。 提出了基于数值积分法灵敏度的电力系统快速紧急控制决策算法，这种算法可以综合应用多种紧急控制措施，能够充分发挥各种控制措施的特长，以较少的代价维持系统稳定。该算法支持电力系统各元件的复杂模型。更多还原

【Abstract】 As an important measure to prevent wide-area power system blackout when a serious fault occurs, transient stability control (TSC) system has been used widely in recent years. Based on the summarization of previous work, this dissertation conducts systematical research work on the generation of the emergency control strategy.An algorithm for Generation of operation mode set is presented. Given the required parameters, it can be used to get operation mode set which can satisfy all the constraints and cover all operation modes. Based on the operation mode set, a new algorithm for the generation of emergency control strategy table is presented, which can be used in both on-line calculation and off-line calculation.Particle swarm optimization (PSO) algorithm, which is based on the evolutionary computation, is used to solve the constrained load flow. After the modification of the PSO algorithm based on the characteristics of constrained load flow, its efficiency and convergence are improved greatly and the modified algorithm is capable of practical power system calculation.A mathematical model for optimal load-shedding control is established which minimizes the total amount of shed loads to maintain transient angle stability. A method of calculating the sensitivity of the loads to the constraint function is proposed. Based on the sensitivity and time simulation, a new load-shedding algorithm is presented. This algorithm uses one time more calculations to get sensitivities of all controls than that of SBS (Step By Step), so the strategy of load shedding, which is used to maintain the system transient stability, can be calculated quickly. The principle of the algorithm is simple. Case studies show the algorithm’s efficiency and convergence.Generator tripping is used to test the universality of the grads and sensitivity calculation method of the load-shedding algorithm. A fast generator-tripping algorithm is proposed, which is based on the fast load-shedding algorithm and the characteristics of the generator tripping.A systematic emergency control strategy-making algorithm based on the integral sensitivity is presented. It can coordinate kinds of controls, and get more efficient strategy with less cost. This algorithm can deal with various models of power system components.更多还原