基于混合储能的双馈风机运行控制研究
发布时间：2019-02-23 16:46
【摘要】：风电能源因其清洁、可再生的优点,具有很大的发展优势。因为较佳的控制性能和经济性,双馈机组在风力发电中占有重要的地位。但双馈风机的故障穿越能力较弱,并且由于风力的波动性和随机性导致风机有功输出波动较大,直接并网会威胁电网的稳定安全运行,因此需要研究有效的技术平抑风机的有功波动。本文首先分析了双馈式感应发电机(Doubly Fed Induction Generator, DFIG)的基本运行原理及换流器的控制策略,在此基础上,提出将蓄电池-超级电容混合储能系统(hybrid energy storage system, HESS)安装在每一台双馈风电机组的换流器直流母线上,控制]HESS进行蓄能或放电,来平抑风机的波动功率。围绕该方案,建立了蓄电池-超级电容和DC/DC换流器构成的混合储能系统的结构拓扑,蓄电池组通过DC/DC换流器与超级电容并联,超级电容器组通过DC/DC换流器与直流母线相连；制定了储能系统能量管理方案,即由超级电容通过DC/DC换流器负责与风电机组的能量交换,蓄电池通过充放电控制超级电容工作在最优的电压范围,DC/DC换流器采用互补PWM控制方式。通过PSCAD仿真,验证了混合储能控制方案及控制策略的有效性。最后本文提出一种应用于双馈机风电场的双层恒功率控制方案,高层的风场监视控制系统(wind farm supervisory controller, WFSC)根据发电计划或调度需求为底层的每台风机控制器产生有功参考,底层风机控制器调节每台双馈风机输出所需的有功功率,而风机输出的有功与所需有功之间的差额将由底层控制器控制储能系统释放或吸收。最后,在PSCAD中搭建5台风电机组构成的风场模型,通过仿真验证了控制方案的可行性。
[Abstract]:Because of its clean and renewable advantages, wind power has a great advantage in development. Because of better control performance and economy, doubly-fed units play an important role in wind power generation. However, the fault traversing ability of doubly-fed fan is weak, and because of the fluctuation and randomness of wind force, the active power output of the fan fluctuates greatly, and the direct grid connection will threaten the stable and safe operation of the power grid. Therefore, it is necessary to study the effective technology to stabilize the active power fluctuation of the fan. In this paper, the basic operation principle of doubly-fed induction generator (Doubly Fed Induction Generator, DFIG) and the control strategy of converter are analyzed at first. On the basis of this, a hybrid energy storage system (hybrid energy storage system, with storage battery and super capacitor is proposed. HESS) is installed on the DC bus of the converter of each doubly-fed wind turbine. The HESS is controlled to store or discharge the energy to stabilize the fluctuating power of the fan. The structure topology of hybrid energy storage system composed of accumulator super capacitor and DC/DC converter is established around this scheme. The battery set is connected with super capacitor through DC/DC converter. The supercapacitor bank is connected to the DC bus through the DC/DC converter. The energy management scheme of the energy storage system is developed, that is, the super capacitor is responsible for the energy exchange with the wind turbine through the DC/DC converter, and the storage battery controls the super capacitor to work in the optimal voltage range through charging and discharging. DC/DC converter adopts complementary PWM control mode. The effectiveness of the hybrid energy storage control scheme and control strategy is verified by PSCAD simulation. Finally, a double-layer constant power control scheme applied to doubly-fed wind farm is proposed. The high level wind field monitoring and control system (wind farm supervisory controller, WFSC) generates active power reference for every typhoon controller in the bottom according to the generation plan or scheduling requirements. The bottom fan controller adjusts the active power required for each doubly-fed fan output, and the difference between the fan output active power and the required active power will be released or absorbed by the bottom controller control energy storage system. Finally, the wind field model of five wind turbines is built in PSCAD, and the feasibility of the control scheme is verified by simulation.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM315
本文编号：2429021
[Abstract]:Because of its clean and renewable advantages, wind power has a great advantage in development. Because of better control performance and economy, doubly-fed units play an important role in wind power generation. However, the fault traversing ability of doubly-fed fan is weak, and because of the fluctuation and randomness of wind force, the active power output of the fan fluctuates greatly, and the direct grid connection will threaten the stable and safe operation of the power grid. Therefore, it is necessary to study the effective technology to stabilize the active power fluctuation of the fan. In this paper, the basic operation principle of doubly-fed induction generator (Doubly Fed Induction Generator, DFIG) and the control strategy of converter are analyzed at first. On the basis of this, a hybrid energy storage system (hybrid energy storage system, with storage battery and super capacitor is proposed. HESS) is installed on the DC bus of the converter of each doubly-fed wind turbine. The HESS is controlled to store or discharge the energy to stabilize the fluctuating power of the fan. The structure topology of hybrid energy storage system composed of accumulator super capacitor and DC/DC converter is established around this scheme. The battery set is connected with super capacitor through DC/DC converter. The supercapacitor bank is connected to the DC bus through the DC/DC converter. The energy management scheme of the energy storage system is developed, that is, the super capacitor is responsible for the energy exchange with the wind turbine through the DC/DC converter, and the storage battery controls the super capacitor to work in the optimal voltage range through charging and discharging. DC/DC converter adopts complementary PWM control mode. The effectiveness of the hybrid energy storage control scheme and control strategy is verified by PSCAD simulation. Finally, a double-layer constant power control scheme applied to doubly-fed wind farm is proposed. The high level wind field monitoring and control system (wind farm supervisory controller, WFSC) generates active power reference for every typhoon controller in the bottom according to the generation plan or scheduling requirements. The bottom fan controller adjusts the active power required for each doubly-fed fan output, and the difference between the fan output active power and the required active power will be released or absorbed by the bottom controller control energy storage system. Finally, the wind field model of five wind turbines is built in PSCAD, and the feasibility of the control scheme is verified by simulation.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM315
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