pscad中搭建的双馈风机模型，自带英文资料，可以用于观察小干扰稳定等。

在MATLAB2017a中搭建了风电和储能并网Simulink模型，风机采用传统的双闭环矢量控制策略，电池储能系统采用的是PQ矢量控制策略，可以稳定的向电网传输功率，电压电流波形较好。

双馈风机低电压穿越分析模型，基于PSCAD软件建立的模型，在风机并网的时候提前做双馈风机的低电压穿越仿真验证，电网要求做风机的高低电压创越之后才可以并网，这里给出双馈风机的高低电压创越的验证模型。

行业-电子政务-基于安全域的含双馈风机电力系统暂态稳定性分析方法.zip

Abstract —— Due to network events and power system emergencies, doubly-fed induction generator (DFIG) based wind turbines can suffer from low voltage ride through which may result to the disconnection of the DFIG. Before connecting to the electricity grid again, DFIG has to be synchronized to minimize the transient effects and ensure smooth connection to the power grid. In this paper, a direct voltage control based synchronization technique is proposed for DFIG based wind turbines. Additional control features are added to original direct voltage control method for implementation of the proposed synchronization strategy. A grid connection logic is designed and presented for soft connection of DFIG to the grid. The proposed technique is implemented in a DFIG based wind turbine model and tested through simulations with various practical scenarios. Voltage transients, frequency analysis, voltage phase and system stability are analyzed in details and simulation results presented. From the results, it can be revealed that the proposed synchronization technique functions effectively and efficiently. It is also shown that by using the proposed technique, the process of synchronization and grid connection do not introduce any changes into the system, which may cause protection devices to trip or mal-operation.

Abstract —— This paper presents a mathematical model of a doubly fed induction generator (DFIG) in the positive synchronous reference frame under distorted grid voltage conditions. The oscillations of the DFIG’s electromagnetic torque and the instantaneous stator active and reactive powers are fully described when the grid voltage is harmonically distorted. Four alternative control targets are proposed to improve the system responses during grid harmonic distortions. A new rotor current control scheme implemented in the positive synchronous reference frame is developed. The control scheme consists of a proportional–integral (PI) regulator and a harmonic resonant (R) compensator tuned at six times the grid frequency. Consequently, the fundamental and the fifth- and seventh-order components of rotor currents are directly regulated by the PI–R controller without sequential-component decompositions. The feasibility of the proposed control strategy is validated by simulation studies on a 2.0-MW wind-turbine-driven DFIG system. Compared with the conventional vector control scheme based on standard PI current controllers, the proposed control scheme leads to significant elimination of either DFIG power or torque oscillations under distorted grid voltage conditions.

Abstract ——This article deals with a phase-locked loop (PLL)- based novel control for wind turbine driven doubly fed induction generator interfaced to utility grid with a battery energy storage (BES) connected at the dc link. The control of grid-side converter (GSC) is modified to export/import constant power to/from the grid. The state of charge of BES helps in deciding the reference export power to the grid apart from the manual selection using averaged wind power in a particular period of time. An off maximum power point tracking logic is incorporated in the rotor-side converter (RSC) control to operate the BES within its constraints and, moreover, to feed constant power to the grid. In addition, the energy management scheme of the system is presented in the form of flowchart for both exporting and importing power to/from the grid. The RSC and GSC have taken care of unity power factor operation at stator terminals and to mitigate harmonics and grid currents balancing, respectively. The system performance is found robust as the PLL response is not affected even under grid voltages with dc offset. The system is modeled and simulations are carried out in MATLAB using SimPowerSystems tool box. Moreover, the control scheme performance is compared with conventional control algorithms both in terms of PLL and converter controls. To validate the effectiveness of the control scheme, a prototype of the system is developed. Test results demonstrate the satisfactory performance of the system under various operating conditions.

Abstract —— The doubly fed induction generator is particularly appropriate to be used in wind power generation systems. However, in weak grids its stator connection to unbalanced or distorted voltages imposes low frequency and high amplitude rotor current harmonics. Also, the grid side converter must deal with the same voltage conditions. The paper addresses the first issue presenting a voltage harmonics controller in the dq reference frame to be included in the high dynamics rotor current controller. Simulation and experimental results demonstrate the performance of the proposed controller imposing a sinusoidal input current.

Abstract —— Grid connected wind turbines may produce flicker during continuous operation. This paper presents a simulation model of a MW-level variable speed wind turbine with a doubly fed induction generator developed in the simulation tool of PSCAD/EMTDC. Flicker emission of variable speed wind turbines with doubly fed induction generators is investigated during continuous operation, and the dependence of flicker emission on mean wind speed, wind turbulence intensity, short circuit capacity of grid and grid impedance angle are analyzed. A comparison is done with the fixed speed wind turbine, which leads to a conclusion that the factors mentioned above have different influences on flicker emission compared with that in the case of the fixed speed wind turbine. Flicker mitigation is realized by output reactive power control of the variable speed wind turbine with doubly fed induction generator. Simulation results show the wind turbine output reactive power control provides an effective means for flicker mitigation regardless of mean wind speed, turbulence intensity and short circuit capacity ratio.

本文在研究双馈感应发电机变速恒频风力发电系统的基础上,致力于研究其励磁电源。以双 PWM 变换器作为主要研究对象，对其进行了分析、建模与控制，主要包括以下几方面： 1、对国内外风力发电现状从装机容量、发展状况以及技术特点等几个方面作了较为全面的综述。对几种典型的变速恒频风力发电系统作了详细的对比分析，解释了将双馈感应发电机应用于变速恒频风力发电的可行性和优越性。通过对目前可用于变速恒频风电系统的励磁电源进行比较得出，采用双 PWM 变换器作为变速恒频风电系统的励磁电源是一种现实的选择。 2、介绍了网侧 PWM 变换器的基本结构及运行原理，建立了其数学模型，探讨了控制策略。为了实现网侧变换器的控制目标，分析了其基本结构，建立了其在两相同步旋转坐标系下的数学模型，得出电网电压定向控制策略，构建了双闭环串级 PI控制方案。 给出了主电路参数及 PI 参数的计算方法， 并对空间矢量脉宽调制（SVPWM）算法进行了分析。仿真结果证明了该控制策略的有效性。 3、 在分析双馈感应发电机数学模型的基础上， 探讨了转子侧变换器的控制策略。本文在分析定子磁链定向矢量控制的基础上，构建了有功和无功功率解耦控制的双闭环 PI 控制方案。 仿真结果证明该控制策略能实现最大风能追踪和定子有功和无功功率的独立控制。 4、建立了双 PWM 变换器控制系统的仿真模型，进行系统仿真。仿真结果表明，网侧在整流和逆变状态都能实现单位功率因数运行；双馈电机转速能快速跟踪风速变化；电机在亚同步、同步、超同步三种状态运行时，转子电流频率满足变速恒频运行条件；同时实现了定子无功功率的独立调节。 5、结合实验室具体条件，搭建了网侧 PWM 变换器实验电路，编制了基于TMS320F2812 的网侧 PWM 变换器的控制程序，并对实验结果进行了分析。