计及励磁系统的抽水蓄能机组网机关系研究
发布时间：2019-02-22 10:35
【摘要】：抽水蓄能机组具有削峰填谷、调频调相等功能,对于电力系统的安全稳定运行具有十分重要的作用。但抽水蓄能机组运行工况多,工况转换复杂,因此对于其网机运行稳定性的分析十分重要。 本文建立计及AVR的响水涧抽水蓄能机组的单机-无穷大系统模型,对于典型小扰动和大扰动工况下的机组和系统响应进行仿真计算。自动电压调节器(AVR)可提高系统的静态和暂态稳定性,但同时会恶化系统阻尼,使系统发生低频振荡的可能性大大增加,为了改善这一问题,目前最有效的措施之一是采用电力系统稳定器(PSS)。考虑到以电功率信号为单输入的传统PSS在有功功率增减时存在严重的“无功反调”现象,对电力系统的安全稳定运行产生不利影响。故采用以加速功率信号作为输入、计及机械功率变化的加速功率型PSS,以抑制两种运行工况下及工况转换过程中的“无功反调”问题。 PSS参数对于其性能具有十分重要的影响,且抽水蓄能机组存在两种运行工况,比常规水力发电机组更为复杂,故研究PSS应用于抽水蓄能机组时的参数整定方法十分必要。本文分别采用单点最优法和两点最优法对相位补偿环节参数进行整定,并根据抽水蓄能机组的运行特点,在加速功率型PSS基础上增加功率方向环节,构成功率方向性PSS,从而实现在两种运行工况下,PSS都可提供良好的正阻尼,抑制系统低频振荡。分别在两种工况下,以及工况转换过程中,对附加PSS前后的系统响应进行仿真对比,结果表明按该思路整定的PSS在抽水蓄能机组中可起到良好的相位补偿效果,参数整定方法正确有效。 为对上述网机关系模型仿真结果的有效性进行验证,本文基于S函数建立单机-无穷大系统的场-路-网耦合时步有限元模型。该模型可以准确计及磁场饱和、磁场畸变等非线性因素,提高系统仿真的精度。同时,为分析励磁系统对于运行稳定性的影响,在单机-无穷大系统模型的基础上加入AVR和PSS模型。对典型小扰动和大扰动工况进行仿真计算,研究分析机组和电网稳定性能以及励磁调节系统对其产生的影响,为大型同步电机网机运行稳定性的研究提供理论依据。 为了进一步验证所建网机模型的有效性和可行性,采用10KW6极反装凸极电机作为模型机,进行空载三相短路试验,实测波形和仿真结果吻合良好,说明所建模型和计算方法有效可行。
[Abstract]:Pumped storage unit has the functions of peak cutting and valley filling, frequency modulation and phase adjustment, which plays an important role in the safe and stable operation of power system. However, the operation conditions of pumped-storage units are many and the conversion of operating conditions is complex, so it is very important to analyze the stability of the grid units. In this paper, the single-machine infinite bus system model of Xiangshuijian pumped storage unit considering AVR is established. The responses of units and systems under typical small disturbance and large disturbance conditions are simulated and calculated. The automatic voltage regulator (AVR) can improve the static and transient stability of the system, but at the same time it will worsen the damping of the system and increase the possibility of the low frequency oscillation. In order to improve this problem, One of the most effective measures is to use the power system stabilizer (PSS). It is considered that the traditional PSS with single input of electric power signal has a serious "reactive power inverse adjustment" phenomenon when the active power increases or decreases, which has a negative impact on the safe and stable operation of power system. Therefore, the accelerated power type PSS, which takes the acceleration power signal as the input and takes into account the mechanical power change, is adopted to suppress the "reactive power inverse adjustment" problem in the two operating conditions and in the process of transition. The parameters of PSS have a very important effect on its performance, and there are two operating conditions of pumped storage unit, which is more complex than that of conventional hydroelectric generating unit, so it is very necessary to study the parameter setting method of PSS applied to pumped storage unit. In this paper, single point optimal method and two point optimal method are used to adjust the parameters of phase compensation link, and according to the operating characteristics of pumped storage unit, power direction link is added to accelerate power type PSS to form power directional PSS,. Thus, PSS can provide good positive damping and suppress the low frequency oscillation of the system under two operating conditions. The system responses before and after the addition of PSS are simulated and compared under two different operating conditions, respectively. The results show that the PSS adjusted according to this idea can play a good phase compensation effect in the pumped-storage unit. The parameter tuning method is correct and effective. In order to verify the validity of the simulation results of the above net-machine relationship model, this paper establishes the field-circuit-network coupling time-step finite element model of single-machine infinite bus system based on S function. This model can accurately take into account the nonlinear factors such as magnetic field saturation and magnetic field distortion, and improve the accuracy of system simulation. At the same time, in order to analyze the effect of excitation system on operation stability, AVR and PSS models are added on the basis of single-machine infinite bus system model. The simulation calculation of typical small disturbance and large disturbance conditions is carried out, and the stability performance of unit and power network and the influence of excitation regulation system on it are studied and analyzed, which provides a theoretical basis for the study of the operation stability of large synchronous motor grid machines. In order to further verify the validity and feasibility of the model, the 10KW6 pole reverse mounted salient pole motor is used as the model machine, and the no-load three-phase short circuit test is carried out. The measured waveform is in good agreement with the simulation results. The model and calculation method are proved to be effective and feasible.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV743;TV736
本文编号：2428132
[Abstract]:Pumped storage unit has the functions of peak cutting and valley filling, frequency modulation and phase adjustment, which plays an important role in the safe and stable operation of power system. However, the operation conditions of pumped-storage units are many and the conversion of operating conditions is complex, so it is very important to analyze the stability of the grid units. In this paper, the single-machine infinite bus system model of Xiangshuijian pumped storage unit considering AVR is established. The responses of units and systems under typical small disturbance and large disturbance conditions are simulated and calculated. The automatic voltage regulator (AVR) can improve the static and transient stability of the system, but at the same time it will worsen the damping of the system and increase the possibility of the low frequency oscillation. In order to improve this problem, One of the most effective measures is to use the power system stabilizer (PSS). It is considered that the traditional PSS with single input of electric power signal has a serious "reactive power inverse adjustment" phenomenon when the active power increases or decreases, which has a negative impact on the safe and stable operation of power system. Therefore, the accelerated power type PSS, which takes the acceleration power signal as the input and takes into account the mechanical power change, is adopted to suppress the "reactive power inverse adjustment" problem in the two operating conditions and in the process of transition. The parameters of PSS have a very important effect on its performance, and there are two operating conditions of pumped storage unit, which is more complex than that of conventional hydroelectric generating unit, so it is very necessary to study the parameter setting method of PSS applied to pumped storage unit. In this paper, single point optimal method and two point optimal method are used to adjust the parameters of phase compensation link, and according to the operating characteristics of pumped storage unit, power direction link is added to accelerate power type PSS to form power directional PSS,. Thus, PSS can provide good positive damping and suppress the low frequency oscillation of the system under two operating conditions. The system responses before and after the addition of PSS are simulated and compared under two different operating conditions, respectively. The results show that the PSS adjusted according to this idea can play a good phase compensation effect in the pumped-storage unit. The parameter tuning method is correct and effective. In order to verify the validity of the simulation results of the above net-machine relationship model, this paper establishes the field-circuit-network coupling time-step finite element model of single-machine infinite bus system based on S function. This model can accurately take into account the nonlinear factors such as magnetic field saturation and magnetic field distortion, and improve the accuracy of system simulation. At the same time, in order to analyze the effect of excitation system on operation stability, AVR and PSS models are added on the basis of single-machine infinite bus system model. The simulation calculation of typical small disturbance and large disturbance conditions is carried out, and the stability performance of unit and power network and the influence of excitation regulation system on it are studied and analyzed, which provides a theoretical basis for the study of the operation stability of large synchronous motor grid machines. In order to further verify the validity and feasibility of the model, the 10KW6 pole reverse mounted salient pole motor is used as the model machine, and the no-load three-phase short circuit test is carried out. The measured waveform is in good agreement with the simulation results. The model and calculation method are proved to be effective and feasible.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV743;TV736
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