| 题名 | 新型变速恒频风力发电系统运行方式研究; 新型变速恒频风力发电系统运行方式研究 |
| 作者 | 1陈学顺,电工研究所 |
| 学位类别 | 硕士 |
| 答辩日期 | 2003 |
| 授予单位 | 中国科学院电工研究所 |
| 导师 | 1许洪华,电工研究所 |
| 关键词 | 变速恒频 风力发电 双馈电机 矢量控制 循环变流器 variable-speed constant-frequency wind power generating system doubly-fed induction generator vector control cycloconverters |
| 其他题名 | 新型变速恒频风力发电系统运行方式研究 |
| 学位专业 | 电力电子与电力传动 |
| 中文摘要 | 变速恒频发电技术是一种新型高效的发电技术，在风力发电领域有着良好的应用前景。本文首先比较了几种变速恒频方案，从中选择了双馈式变速恒频方案；它运用双馈电机的工作原理，允许发电机转速变化，而在电机转子侧接入低频励磁电流，通过控制该电流的频率，保证双馈电机定子输出的频率恒定；再结合矢量控制技术，通过调节转子电流来控制定子电流的转矩分量和励磁分量，相应独立地控制发电机输出的有功功率和无功功率。本文在对风力机和双馈电机进行了数学分析后，给出了功率在风力机和双馈电机中的流动过程图解，同时给出了双馈电机的稳态等效电路；然后，经过坐标变换，进一步得出了同步坐标系下双馈电机的基本电磁方程、功率方程、动态等效电路和 综合矢量图，并借助通用动态等效电路的形式，得出了便于定子磁链分析的不对称等效电路。本文利用定子磁链定向的矢量控制方法，将同步坐标系下的双馈电机数学模型简化后得到矢量控制系统的模型；矢量控制模型与双馈电机模型一起构成闭环控制系 统。对双馈电机转子侧所接变频器类型，本文也进行了对比分析，对选用的循环变流器的原理还作了进一步的分析，包括环流控制方法、余弦交截法原理、触发脉冲产生、零电流检测和换向逻辑控制等部分，并给出了其数学模型。“在最后的仿真实验中，本文利用Matlab软件建立了系统各部分的仿真模型，选；用与风力机最大输出功率对应的定子有功功率作为矢量控制的参考值做了仿真实验，并给出了仿真结果，验证了定子磁链定向矢量控制策略的正确性：既保证了定子输出频率的恒定，又达到了有功功率无功功率独立解祸控制的目的，同时还较好地跟踪了风力机的最大功率输出。 Variable-speed constant-frequency (VSCF) operation is a new high efficient technology for power generation, which has a good future in the field of wind power generating. In this paper, several scheme of VSCF is compared firstly, of which gets doubly-fed generating mode. Doubly-fed VSCF wind power generating system uses a doubly-fed induction generator, which rotate speed: can be able to change with wind turbine, and it ensures a constant-frequency output, by controlling the frequency of current input into rotor windings. In vector trans control system, the control of stator active power and the control of stator reactive power can be essentially decoupled, and the former is via torque component and the latter is via exciting component of stator current. After analyzing the mathematical model of wind turbine and doubly-fed induction generator, a schematic is given about the power flow in the wind turbine and generator and a static equivalent circuit is shown as well. Then, through the reference frame transform, the electromagnetic equation, dynamic equivalent circuit, and vectorgraph.of doubly-fed generator can be gotten in the dq reference frame, In virtue of the general dynamic equivalent circuit, it produces a asymmetry equivalent. Furthermore, under the vector control strategy of stator field-orient, a vector control model will derive from the generator, which form a close control system with the generator model. About the transducer between rotor and power source, the paper uses- a cycloconverters, comprising 36 thyristors, and analyzes the control of circumfluence, the method of cosine crossing, the producing of trigger pulse, zero current detecting, commutating logic control and its mathematical model. In the simulation experiment, the whole system model is founded by the software Matlab/Simulink. Using the stator active power computed from the maximal output power of the wind turbine as the reference value of vector control system, the result of experiment approves that the control strategy is true. Not only the frequency of stator current is constant, but the control of stator active and reactive are decoupled, and the output power tracks the maximal power of wind turbine. |
| 语种 | 中文 |
| 公开日期 | 2010-10-18 |
| 页码 | 62 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.iee.ac.cn/handle/311042/7277]  |
| 专题 | 电工研究所_其他部门_其他部门_硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 1陈学顺,电工研究所. 新型变速恒频风力发电系统运行方式研究, 新型变速恒频风力发电系统运行方式研究[D]. 中国科学院电工研究所. 2003. |
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