In this thesis, research has been made in-depth in the following areas: the model building's self adapting of the numerical simulation, the numerical format of the mixed free-surface-pressure flow, the combined calculation of multistage system and the parallel computation of the transient flow of large-scale system.
现代大型水力机械装置系统中流体网络结构复杂，流动状态各异，机电设备、控制元件及水工建筑物繁多，对该类系统进行瞬变流计算仍有许多理论和实际问题有待解决，本文针对该类系统数值模拟建模的自适应、明满交替流动计算格式、多级系统的联合计算及大型系统的瞬变流并行计算等问题进行了深入研究，对瞬变流计算理论及大型水利水电工程的优化设计和运行都具有重要的意义。
Based on lots of documentation, this paper confirms the theory of study and analysis of cascading failures are:(1) Chose initial fault firstly, i. e. Chose the line which can arouse cascading failures to study. Three steps method of initial fault search is presented in the paper. Namely ascertain key transmission surface firstly, Chose the branch line of initial fault based on centricity model secondly, and ascertain special key branch line of system thirdly.(2) Resolve the ground power flow based PQ method, i. e. calculate voltage value and angle of every node according to given types of system node, then calculate power flow of head terminal and end terminal.(3) chose initial fault branch line to open and calculate the distribution of power flow in branch line left using integrate PQ method and compensatory method one by one, i. e. the calculation of system opening power flow.(4) Analyze the transient stabilization and calculate the angle difference of arbitrate two generators. If the angle difference exceed 180 degree, it can be deemed that the system lose stabilization. Stop calculation. Otherwise come into the next step.(5) Compare the opening power flow and setting power flow of every branch road. branch road is opened if the opening power flow is bigger than the setting power flow and then carry the opening calculation over again. End the calculation if the opening power flow of all the branch roads is all smaller than the setting power flow.(6) Export the result of all the opening branch roads. At the same time opening order is also exported orderly during the process of exportation. If the opening of one line cause overload at lines over two, chose one line to open.(7) Form fault tree of opening road according to the basic theory of fault tree.
2基于PQ分解法求出系统的基态潮流，即给定系统的节点类型后，据其计算各个节点的电压幅值和相角，然后计算各个支路首端和末端的潮流；(3)逐一选择首故障支路开断，采用PQ分解法和补偿法相结合，逐一计算每一条支路开断后，潮流在剩余支路中的分配情况，即计算系统的开断潮流；(4)进行暂态稳定分析，计算任意两台发电机间的相角差，如果超过180度，则认为系统失稳，停止计算；否则进入下一步：(5)对各个支路的开断潮流与继电保护的整定潮流相对比，如果大于整定潮流，则此支路被开断，重新进行开断计算，如果所有的支路电加热管开断潮流均小于整定值，则计算结束：(6)对所有的开断线路进行输出，输出时对连锁故障的开断顺序也同时进行顺序输出，如果有一条线路开断引起两条以上支路同时过载的情形，选择一条支路进行开断；(7)根据故障树的基础理论，形成开断路径故障树。
In the present lightning transient calculation, attenuation and distortion of lightning impulses, no matter what they are, are always considered according to the Q-V characteristics under double exponential impulses.
实际上，由于波的折、反射，变电站的雷电侵入波大多数是衰减振荡冲击波，关于这种波形下电晕伏库特性的研究，国内外尚无研究成果报道。
Hence, in this article high order parameter model of Powerformer is presented firstly, and the formula of operational impedances, sub-subtransient reactance, subtransient reactance and transient reactance of the third order model of Powerformer are derived. The dynamic behavior of Powerformer is described accurately. Then, the different reactance parameters and time constants of Powerformer are determined by using least square method from the frequency characteristics obtained by numerical field calculation.
解决这些问题都要求提高能量变换器电磁参数，特别是瞬态参数的计算精度，为此本文首先建立了能量变换器的高阶参数模型，导出了能量变换器三阶模型的运算电抗、超-超瞬态电抗、超瞬态电抗和瞬态电抗的表达式，较准确地描述了能量变换器的动态过程，给出了根据电磁场数值计算得到的频率特性，利用最小二乘法确定三阶模型的各个电抗和时间常数的参数辨识方法，为精确预计和计算能量变换器的运行性能打下了基础。
In this paper, the method for transient characteristic calculation of PWR coolant system is studied and a model is developed.
本论文主要研究压水堆冷却剂系统的瞬态仿真计算方法并提出相应的计算模型。
The comparison results show that the thermal field model and its modification relationship are correct. Finally, following the similar procedures as in steady-state calculation, the finite element equations for the winding`s transient thermal and flow field can be constructed. The winding`s transient thermal field distribution is solved by cross-iteration method at every discrete moment. The winding`s highest temperature-rise variation curve is obtained.
对利用修正后的热路模型和有限元仿真所得温度场的分布进行比较，结果证明了模型及其修正关系是正确的；与稳态条件的计算相似，建立绕组暂态温度场和流场的有限元方程，交叉迭代得到暂态过程中各离散时刻绕组的温度场和流场分布，获得绕组最高温升变化的曲线。
Within this context, four specific areas are addressed:(1) By means of finite integration technique, a new kind of the first order partial difference equation is derived from the original disperse transmission line equation of the uniform waveguide's. As it is the kind of one dimension Dirichlet's boundary problem, it is convenient for us to solve this equation from the leapfrog scheme. Because computation is carried out in one dimension, both high calculation efficiency and precision have been obtained in this method. Meanwhile, this method provide us a different selection to simulate the transient response of waveguide with non-simplical, for examples cylinder and elliptic waveguide, and avoid solving the second order equation, or using finite difference time domain to simulate a three dimension problem, sometimes the latter precision is not satisfied with the need, or low efficiency.
在这一研究内容下，主要研究四个方面的问题：(1)在完成金属波导传输线方程时域形式的基础之上，应用有限积分技术，把波导特征模式的色散传输线方程，化简为一组新的一阶偏微分方程组，该边值问题属一维Dirichlet边值问题，从而便于用蛙跳格式求解，由于是在一维中计算，该方法具有很高计算效率和精度，从而避免了以往为得到金属波导中特征模的时域响应特性，须要求解二阶方程，或用时域有限差分方法求解三维问题的方法，对于后者来说，计算有时是不准确的，或是很耗时的例如计算诸如圆波导、椭圆波导等其它复杂形状的波导。
New methods of numerical design on air conditioning system in buildings are presented in this paper. In order to realize numerical design, the principle of the digital scroll compressor is introduced and analyzed, the mathematics calculation models are built up, and the thermodynamic calculations of every link in the digital scroll air-conditioning system are made, what`s more, the room transient heat load is considered together with capacity adjustable air conditioner.
本文提出了楼用涡旋压缩机空调系统数值法设计的新途径，对数码涡旋压缩机的原理进行了介绍和分析，建立了数码涡旋压缩机的数学计算模型，同时对数码涡旋空调系统的各环节进行了热力学计算，并将房间瞬时热负荷与能力可连续调节的空调系统结合在一起，实现了真正意义上的空调数值化设计。
At first, the researches on the 3D steady and transient eddy current fields, stray losses, electromagnetic forces acting on the coils and the relevant numerical methods are summarized in this dissertation. The research is carried out around the relevant theory and key points in the numerical calculation.
首先全面深入地总结了国内外在变压器稳态和瞬态涡流场问题、涡流损耗和线圈电磁力问题及相关的数值计算方法等研究领域的发展概况，针对与课题相关的理论和计算难题进行研究。
It proves that the design and electro-magnetic transient calculation of the FCL are correct and can be used. Experiments also show that a high voltage will be induced on the DC coil side during the fault state.
结果表明，它有很好的半波限流作用，证明了我们提出的设计方法和电磁暂态仿真计算的正确性和可用性。
Analysis solution of whole-space multi-turn coils was derived; transient processes of primary, secondary and total field were analyzed; and calculation method of turn-off effects for linear current and half sine current in whole-space magnetic dipole source was also studied.
推导了全空间多匝小回线源产生的瞬变磁场解析式，分析了瞬变电磁一次场、二次场和总场暂态过程，并对全空间磁偶极源中线性关断电流和半正弦关断电流关断效应的计算方法进行了研究。
In the numerical calculation of electromagnetic transient response, the G-S transform method is used frequently for inverse Laplace transform.
在电磁场瞬变响应的数值计算中，常采用G-S变换法作逆拉氏变换。
Analysis and calculation of very fast transient over voltage in GIS.
GIS中快速暂态过电压的分析及计算。
Based on analyzing the generating reasons of temporary ground potential rise, a calculation model is suggested to calculate TGPR with electro-magnetic transient program.
在分析外壳地电位升高原因的基础上，提出了用电磁暂态程序计算外壳地电位升高的等值计算模型。
Due to the fact that the PSpice kernel uses an adaptive timestep method during detailed transient analysis, the user has no control on the calculation instances.
由于这样的事实在详细的瞬变分析期间，PSpice仁使用一个能适应的timestep方法，用户没有在演算事例的控制
Based on the one-dimensional model and a calculation code, the transient characteristics of the PRHRS were studied in detail.
在一维质量、动量和能量守恒方程的基础上建立了非能动余热排出系统的数学模型，并编制程序对模型进行了数值求解，模拟了非能动余热排出系统的瞬态特性。
Based on the simulation and calculation implemented by Electro Magnetic Transient Program, this technology is feasible.
论文使用电磁暂态计算程序为计算工具，经过大量仿真模拟计算后认为这项技术是可行的。
The mixed time Explicit-Implicit element pertition integration technique for transient analysis adopted here can achieve considerable calculation efficiency.
混合时间的隐显式元分块积分技术的运用，增强了求解流体—结构耦合运动方程的灵活性和有效性。
The transient calculation is performed by beginning with magnetizing branches in the network, and the semi-explicit Runge-Kutta method is used to solve the nonlinear ordinary differential equations related to magnetizing currents, then the complete transient solution of the network can be obtained based on the calculated magnetizing currents.
并以该模型为基础，进一步介绍了一种计算含非线性电感元件电力网络电磁暂态的有效算法，对于励磁支路，首先建立了非线性微分方程，选用避免迭代的三级半隐龙格-库塔法进行求解，然后再借助于这些微分方程的解来完成对其余线性部分的暂态计算。
After flow and transient stability calculating of the 330kV grid, we got the over-load and hazard lines set. Then we gained the redundant network needed to be built according to the increasing power supply and load in 2010. Adopting regradation step-by-step algorithm by which we can improve the calculation efficiency, we compared the validity of every line, deleted lines with low validity until no redundant line is in the network. At last we got the target network framework adopting the improved ant colony algorithm. Flow distribution, construction investment assessment and target framework of Gansu long-term planning all be considered, from the viewpoint of to be economic and reliability the feasibility of the improved ant colony algorithm is discussed.
在对2006年该网架结构进行了潮流计算与暂态稳定计算分析后，得出了系统的过负荷与危险线路集，并针对2010年新增的电源和负荷点确定了冗余的待建网架，然后利用逐步倒推法比较各待选线路在系统中的有效性，逐步去除有效性低的线路，直到网络中没有冗余线路为止，以此来以提高优化算法的计算效率，最后利用改进后的蚁群算法确定优化后的目标网架结构，并从潮流分布、建设投资估算等方面与甘肃电网远期规划中确定的目标网架进行了比较，从可靠性和经济性角度论证了改进蚁群算法在网架优化中的可行性。