交直流并联系统功角特性优化与暂态稳定控制研究
发布时间：2018-12-11 22:02
【摘要】：随着现代电力系统的不断发展和“西电东送,全国联网”的电力发展战略进一步推进,大规模交直流互联输电逐步成为我国电网发展的基本格局,由此带来的交直流电力系统暂态稳定问题日益突出;另一方面,基于电压源的新型直流输电应用规模不断扩大,使得系统受扰后的动态过程更为复杂。基于此背景,本文在总结传统高压直流输电和新型直流输电系统基本原理与控制模型的基础上,对交直流并联输电系统的暂态运行特性与优化控制相关问题进行了深入研究,为交直流系统运行和调制提供了一定的参考。首先,本文基于等面积原理分析了直流线路接入对交直流暂态功角稳定裕度的影响机理。以系统稳定裕度为指标综合分析了直流过载能力、系统初始功角、故障切除时间以及功率分配等因素对系统暂态稳定的影响,并提出了直流线路改善混联系统稳定性的有效作用域,通过MATLAB/Simulink仿真验证了分析结果。其次,针对多机交直流系统存在的各机组功角轨迹不同调及电磁功率时变性等特殊问题,提出一种用互补机群等值功角的相对运动来评价系统整体功角稳定裕度的分析方法。基于互补机群惯量中心变换提出一种以等值功角同调指数为性能指标的同调机群划分策略,并通过仿真验证了该方法的可行性。然后,针对交直流系统故障后的暂态稳定问题,采用直流功率调制技术对系统故障特性进行优化控制以改善系统的暂态稳定性。在分析直流功率调制改善系统暂态稳定性的基础上,提出了基于两种功率调制的优化策略。对于直流大方式调制,采用prony辨识方法确定其输入信号源,提出基于等值功角同调指数的变步长分层寻优参数优化策略;对于直流功率提升/回降调制,考虑调制参数与等面积原理中加减速面积密切相关以及多变量非线性的特点,采用基于不平衡能量性能指标的粒子群优化算法对调制策略进行优化。最后通过MATLAB与BPA暂态仿真验证了两种优化策略的有效性,优化后的调制策略能够有效改善系统功角稳定性,为实际工程中的直流功率调制策略提供一定的参考。
[Abstract]:With the continuous development of modern power system and the development strategy of "power transmission from west to east, national interconnection", large-scale AC / DC interconnection has gradually become the basic pattern of power grid development in China. The transient stability of AC / DC power system is becoming more and more serious. On the other hand, the application scale of new HVDC transmission based on voltage source is expanding, which makes the dynamic process of the system more complicated. Based on this background, on the basis of summarizing the basic principle and control model of the traditional HVDC transmission system and the new HVDC transmission system, the transient operation characteristics of the AC / DC parallel transmission system and the problems related to the optimization control are deeply studied in this paper. It provides a certain reference for the operation and modulation of AC / DC system. Firstly, based on the principle of equal area, the influence mechanism of DC line access on AC / DC transient power angle stability margin is analyzed. The effects of DC overload capacity, system initial power angle, fault removal time and power distribution on the transient stability of the system are analyzed synthetically with the stability margin of the system. An effective range of DC lines to improve the stability of the hybrid system is proposed. The analysis results are verified by MATLAB/Simulink simulation. Secondly, aiming at the special problems such as different adjustment of power angle locus and time-varying of electromagnetic power in multi-machine AC / DC system, this paper presents an analytical method to evaluate the stability margin of power angle of the whole system by using the relative motion of the equivalent power angle of complementary cluster. Based on the center transformation of inertia of complementary cluster, a homology cluster partition strategy is proposed, which takes the homology index of equivalent power angle as the performance index, and the feasibility of the method is verified by simulation. Then, in order to improve the transient stability of AC / DC system, DC power modulation technology is used to optimize the fault characteristics of the system in order to improve the transient stability of the system. Based on the analysis of DC power modulation to improve the transient stability of the system, an optimization strategy based on two kinds of power modulation is proposed. For large DC modulation, prony identification method is used to determine the input signal source, and an optimization strategy of variable step size hierarchical optimization parameters based on equivalent power angle homology index is proposed. For DC power boost / fallback modulation, the characteristics of modulation parameters are closely related to acceleration and deceleration area in the principle of equal area and multivariable nonlinearity is considered. Particle swarm optimization (PSO) algorithm based on unbalanced energy performance index is used to optimize the modulation strategy. Finally, the effectiveness of the two optimization strategies is verified by MATLAB and BPA transient simulation. The optimized modulation strategy can effectively improve the power angle stability of the system, and provide a certain reference for the DC power modulation strategy in practical engineering.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM721.1;TM712
[Abstract]:With the continuous development of modern power system and the development strategy of "power transmission from west to east, national interconnection", large-scale AC / DC interconnection has gradually become the basic pattern of power grid development in China. The transient stability of AC / DC power system is becoming more and more serious. On the other hand, the application scale of new HVDC transmission based on voltage source is expanding, which makes the dynamic process of the system more complicated. Based on this background, on the basis of summarizing the basic principle and control model of the traditional HVDC transmission system and the new HVDC transmission system, the transient operation characteristics of the AC / DC parallel transmission system and the problems related to the optimization control are deeply studied in this paper. It provides a certain reference for the operation and modulation of AC / DC system. Firstly, based on the principle of equal area, the influence mechanism of DC line access on AC / DC transient power angle stability margin is analyzed. The effects of DC overload capacity, system initial power angle, fault removal time and power distribution on the transient stability of the system are analyzed synthetically with the stability margin of the system. An effective range of DC lines to improve the stability of the hybrid system is proposed. The analysis results are verified by MATLAB/Simulink simulation. Secondly, aiming at the special problems such as different adjustment of power angle locus and time-varying of electromagnetic power in multi-machine AC / DC system, this paper presents an analytical method to evaluate the stability margin of power angle of the whole system by using the relative motion of the equivalent power angle of complementary cluster. Based on the center transformation of inertia of complementary cluster, a homology cluster partition strategy is proposed, which takes the homology index of equivalent power angle as the performance index, and the feasibility of the method is verified by simulation. Then, in order to improve the transient stability of AC / DC system, DC power modulation technology is used to optimize the fault characteristics of the system in order to improve the transient stability of the system. Based on the analysis of DC power modulation to improve the transient stability of the system, an optimization strategy based on two kinds of power modulation is proposed. For large DC modulation, prony identification method is used to determine the input signal source, and an optimization strategy of variable step size hierarchical optimization parameters based on equivalent power angle homology index is proposed. For DC power boost / fallback modulation, the characteristics of modulation parameters are closely related to acceleration and deceleration area in the principle of equal area and multivariable nonlinearity is considered. Particle swarm optimization (PSO) algorithm based on unbalanced energy performance index is used to optimize the modulation strategy. Finally, the effectiveness of the two optimization strategies is verified by MATLAB and BPA transient simulation. The optimized modulation strategy can effectively improve the power angle stability of the system, and provide a certain reference for the DC power modulation strategy in practical engineering.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM721.1;TM712
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