多FACTS阻尼控制交互作用及协调研究

发布时间：2018-06-24 15:36

本文选题：电力系统 + 柔性交流输电系统　；参考：《山东大学》2014年博士论文

【摘要】：柔性交流输电装置(Flexible AC Transmission System, FACTS)在提升电网安全稳定水平和运行效率方面发挥了重要的作用。随着柔性交流输电装置在电力系统中的广泛应用,多个FACTS控制器之间的交互作用和协调问题成为与实际电网安全稳定运行密切相关的关键技术问题和研究热点。研究多个FACTS装置间交互作用的原因和机理,以及协调控制问题,提出系统的、可行的协调控制策略,对于提高电力系统的稳定运行水平,具有重要的理论价值和实际意义。论文以电力系统动态稳定问题为工程背景,在电力系统多FACTS交互作用分析及协调阻尼控制方面,进行了深入的研究和有益的探讨,提出利用多变量频域控制理论、协同专家控制理论和广域协调控制理论相结合的思想解决复杂电力系统中的多FACTS交互作用分析与协调阻尼控制问题,并借助于数模混合仿真实验室验证了论文所提理论和方法的有效性。主要研究工作和创新性成果如下： 1)针对当前多FACTS协调控制与交互作用领域存在的多FACTS交互作用机理研究缺乏的问题,本文提出了采用选择模式分析(Selective Modal Analysis,SMA)和多变量频域控制理论进行多FACTS交互作用机理研究的方法。具体为首先通过SMA法对大规模电力系统的线性化微分-代数方程降阶,得到仅包含与FACTS控制器强相关状态变量的缩略状态空间模型,而后在此缩略状态空间模型的基础上,利用多变量频域控制理论推导出了多FACTS间交互作用的关系和发生条件,并在此基础上揭示了多FACTS间交互作用的机理。研究结果表明：处于多机系统同一电力区域中的多台FACTS阻尼控制器间存在相互制约的关系,当控制器参数满足负交互条件时会发生比较明显的负交互作用,严重时甚至威胁系统的安全运行,当控制器参数满足协调运行条件时才能保证多FACTS间的协调运行与控制。通过典型四机两区域系统和某实际电网的时域仿真结果对比,验证了所提出的多FACTS负交互作用判据在判定多FACTS间是否存在负交互作用的正确性。 2)针对现有研究中多FACTS阻尼控制交互作用量化分析方法缺乏的问题,提出了基于多变量系统等效开环过程(Effective Open-loop Process, EOP)理论和多变量Nyquist推广定理的多FCATS阻尼控制器交互作用量化分析方法。推导了电力系统阻尼控制框架下的EOP,在此基础上建立了用于多FACTS阻尼控制器分析的阻尼控制等效开环过程(Damping Control Effective Open-loop Process, DCEOP).提出了基于DCEOP谱半径和多变量Nyquist推广定理的多FACTS阻尼控制器交互作用分析方法,可以判断系统中是否存在多FACTS阻尼控制器的负交互作用。进一步推导并提出了基于DCEOP的多FACTS交互风险因子和交互作用因子,实现了多FACTS阻尼控制器协调控制及交互作用的量化分析。算例仿真结果验证了本文方法的正确性以及在实际电网中应用的可行性。 3)针对实际大规模电力系统多FACTS阻尼控制器参数难以协调的问题,提出了利用网格自适应直接搜索(Mesh Adaptive Direct Search,MADS)算法整定多FACTS阻尼控制器的方法,该方法使用频域设计思想保证了控制器多运行方式下的鲁棒性,同时使用MADS算法保证多控制器的协调运行能力,最终实现多台FACTS阻尼控制器的协调运行与控制。实际电网中的仿真结果验证了采用MADS方法所整定的多FACTS阻尼控制器参数在提高电力系统阻尼与消除多FACTS负交互作用方面的有效性。 4)针对现有多FACTS参数协调控制方法采用离线仿真校核,只能实现有限数量工况下的协调控制,所整定的控制器参数无法适应运行工况多变的实际电力系统的缺陷,论文将专家控制理论与广域控制理论相融合,提出了一种基于广域协同专家控制理论的多FACTS协调阻尼实时控制新方法。基于多FACTS协调控制专家的先进经验实时监控电网运行状态和多FACTS交互作用程度,实现多FACTS协调有效特征量的实时提取；通过协同专家子系统自动推理生成区域实时协调控制决策,实现区域电网的多FACTS实时协调控制；通过协同专家总系统在线自动生成实时协同控制决策,进而实现全网多FACTS控制器的实时协调控制,从而为复杂系统下的多FACTS协调控制问题提供新的解决方案。通过对某实际电网的仿真及数模混合实时仿真试验验证了所提出的多FACTS实时协调控制方法的有效性。
[Abstract]:Flexible AC Transmission System (FACTS) plays an important role in improving the safety and stability level and operation efficiency of the power grid. With the wide application of the flexible AC transmission device in the power system, the interaction and coordination of multiple FACTS controllers becomes the safe and stable transport of the power grid with the actual power grid. The key technical issues and research hotspots are closely related. It is of great theoretical and practical significance to study the causes and mechanisms of interaction between multiple FACTS devices, and to coordinate control problems, and to put forward a systematic and feasible coordinated control strategy for improving the stable operation level of power systems.
With the dynamic stability of power system as the engineering background, this paper makes a thorough research and beneficial discussion on the multi FACTS interaction analysis and the coordinated damping control of the power system, and proposes to use the multi variable frequency domain control theory and the combination of the expert control theory and the wide area coordinated control theory to solve the complex power system. The multi FACTS interaction analysis and the coordinated damping control problem are used in the system, and the effectiveness of the proposed theory and method is verified with the aid of a mixed simulation laboratory. The main research work and the innovative results are as follows:
1) in view of the lack of multi FACTS interaction mechanism in the multi FACTS coordination control and interaction field, this paper proposes a method to study the interaction mechanism of multiple FACTS using the selective mode analysis (Selective Modal Analysis, SMA) and multivariable frequency domain control theory. The linearized differential algebraic equation of the power system is reduced, and the abbreviated state space model, which contains only the strong correlation state variables of the FACTS controller, is obtained. On the basis of the abbreviated state space model, the relations and conditions of the interaction between the multiple FACTS systems are derived by using the multivariable frequency domain control theory, and the results are revealed on this basis. The interaction mechanism of multiple FACTS shows that there is a mutual restriction between the multiple FACTS damping controllers in the same power region of the multi machine system. When the controller parameters satisfy the negative interaction conditions, there will be a significant negative interaction, which is serious to the safe operation of the threat system and the controller parameters. The coordinated operation and control of multiple FACTS can be ensured when the coordinated operation conditions are met. By comparing the time domain simulation results of a typical four machine two regional system and a real power grid, the correctness of the proposed multiple FACTS negative interaction criterion is verified to determine whether there is a negative interaction between multiple FACTS.
2) in view of the lack of quantitative analysis method for multi FACTS damping control in existing research, a multi FCATS damping controller based on the equivalent open loop (Effective Open-loop Process, EOP) theory of multivariable system and multivariable Nyquist extension theorem is proposed. The damping control of power system is derived. On the basis of EOP, the damping control equivalent open loop process (Damping Control Effective Open-loop Process, DCEOP) for multiple FACTS damping controllers is established on this basis. A multi FACTS damping controller interaction analysis method based on the DCEOP spectral radius and multivariable Nyquist extension theorem is proposed to determine whether or not the system is in the system. The negative interaction of multiple FACTS damping controllers is present. The multi FACTS interaction risk factor and interaction factor based on DCEOP are further derived and proposed, and the quantitative analysis of the coordinated control and interaction of the multi FACTS damping controller is realized. The simulation results of the calculation example verify the correctness of the method and the application in the actual power grid. Sex.
3) aiming at the problem that the parameters of the multi FACTS damping controller are difficult to coordinate in the actual large-scale power system, a method of adjusting the multiple FACTS damping controller using the Mesh Adaptive Direct Search (MADS) algorithm is proposed. The method uses the frequency domain design idea to guarantee the robustness of the controller in the multi operation mode, and at the same time, The MADS algorithm is used to ensure the coordinated operation of the multiple controllers, and the coordinated operation and control of multiple FACTS damping controllers is achieved. The simulation results in the actual power grid verify the effectiveness of the parameters of the multiple FACTS damping controller set by the MADS method in improving the damping of the power system and eliminating the negative interaction of multi FACTS.
4) in view of the existing multi FACTS parameter coordination control method using off-line simulation checking, it can only realize the coordinated control under the limited number of working conditions, and the parameters of the controller can not adapt to the defects of the actual power system. The thesis combines the theory of expert control with the wide area control theory, and proposes a wide area collaboration. A new method of multi FACTS coordinated damping real time control based on expert control theory. Based on the advanced experience of multi FACTS coordinative control experts, the real-time monitoring of the operation state of the power grid and the interaction degree of multi FACTS is realized, and the real-time extraction of the multi FACTS coordination and effective characteristic quantity is realized, and the regional real-time coordination control decision is generated by the Cooperative Expert subsystem self dynamic reasoning. To realize the multi FACTS real-time coordinated control of the regional power grid, the real-time coordinated control decision is generated automatically by the collaboration of the expert general system, and the real-time coordination and control of the full network multi FACTS controller is realized, thus providing a new solution for the multi FACTS coordination control problem under the complex system. The hybrid real-time simulation experiment verifies the effectiveness of the proposed multi FACTS real-time coordinated control method.
【学位授予单位】：山东大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM721.2

【参考文献】