风电场群接入地区电网电压无功协调控制的研究

发布时间：2018-03-07 02:34

本文选题：风电场群　切入点：无功补偿　出处：《东北电力大学》2015年硕士论文　论文类型：学位论文

【摘要】：近几年，随着风电的大规模开发，单机、单场的容量剧增，风电场集中接入电网形成了较大规模的风电场群。由于机组出力具有一定的空间耦合特性，大容量的风功率波动将恶化局部地区的电压、无功状况。目前，电网调度对风电场接入的技术管理都是以风电场为单位、各自独立调节的方式，无法兼顾地区电网的调压需求。因此，有必要将风电场群及其汇集站作为一个整体进行无功电压统一协调控制与管理，通过对风电场群无功输出的协调控制，提高整个区域电网的电压水平。本文针对大规模风电场群接入电网的现状，分别就补偿点的选址定容和风电场群接入地区的电压无功控制方法进行研究，通过控制各风场无功功率的输出，维持控制点电压稳定。本文研究了一种旨在提高风电场群并网地区的电压稳定性的无功补偿点选择和无功补偿容量确定的方法。提出了包含综合灵敏度信息的风电场的电压修正方程，该方程通过雅可比矩阵的降阶方法消去了对电压影响较小的风场远区的有功功率波动，得到了更为精确的电压调整量和不同区域的无功补偿量对观测点电压的灵敏度。通过比较各个补偿位置对控制点的灵敏度信息选择最佳的无功补偿位置，并计算需要补偿的无功调整量，实现对控制点电压的无功支撑。研究了一种旨在提高风电场群并网地区的电压稳定性的电压无功协调控制策略，通过控制各风场的无功输出，维持接入点电压稳定。依次选取具有较大的灵敏度系数的风场作为补偿节点，在满足运行约束条件的情况下，能有效降低网络损耗。同时考虑了不同类型补偿设备的特性，充分利用了每个风场的无功补偿设备的无功调节能力。在基于RTLAB的数模仿真实验平台上搭建了某实际风电系统模仿真模型，研究接入地区各风电场之间无功/电压相互协调，，提高了风电场对接入地区的无功支撑能力，通过仿真分析，验证了本文提出的电网无功电压综合控制策略的正确性和有效性。
[Abstract]:In recent years, with the large-scale development of wind power, the capacity of single machine and single field has increased dramatically, and the wind farm centralized access to the power grid has formed a large scale wind farm group. Large capacity wind power fluctuations will worsen the voltage and reactive power situation in local areas. At present, the technical management of power grid dispatching for wind farm access is based on wind farms and is regulated independently of each other. Therefore, it is necessary to coordinate the reactive power and voltage control and management of wind farm group and its collection station as a whole, and to control reactive power output of wind farm group by coordinated control. Aiming at the current situation of large-scale wind farm group connecting to the power grid, this paper studies the location of compensation point and the voltage and reactive power control method of wind farm group access area respectively. By controlling the output of the reactive power of each wind field, the voltage of the control point is kept stable. In this paper, a method of selecting reactive power compensation points and determining reactive power compensation capacity is studied to improve the voltage stability of wind farms in grid-connected areas, and a voltage correction equation of wind farms with comprehensive sensitivity information is proposed. The equation eliminates the active power fluctuation in the far region of the wind field, which has little effect on the voltage, by using the Jacobian matrix reduction method. The more accurate voltage adjustment and the sensitivity of reactive power compensation in different regions to the voltage of observation point are obtained. By comparing the sensitivity information of each compensation position to the control point, the optimal reactive power compensation position is selected. The reactive power adjustment amount needed to be compensated is calculated, and the reactive power support to the voltage of the control point is realized. In this paper, a coordinated control strategy of voltage and reactive power is studied to improve the voltage stability of wind farm cluster in grid-connected area. By controlling the reactive power output of each wind field, In order to maintain the voltage stability of the access point, the wind field with a large sensitivity coefficient is selected as the compensation node in turn, which can effectively reduce the network loss under the condition of satisfying the operating constraints. At the same time, the characteristics of different types of compensators are considered. The reactive power regulation ability of the reactive power compensation equipment in each wind field is fully utilized. In this paper, a simulation model of wind power system based on RTLAB is built, and the reactive power / voltage coordination among wind farms in the access area is studied, which improves the reactive power supporting ability of wind farm to the access area. The simulation results show that the proposed reactive power and voltage integrated control strategy is correct and effective.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM614;TM921.5

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