风电基地动态无功补偿与低电压穿越的相互影响及协调控制
发布时间：2018-07-28 12:53
【摘要】：随着清洁能源的发展与风电所占的比重增加,风电基地对大电网的影响越来越大。动态无功补偿装置发展历史长,技术相对成熟。在风电场中增加无功补偿装置能够有效调节电网电压,保持电网稳定。低电压是电网常出现的工况之一,故亟需一种控制策略,协调风电基地中动态无功补偿和风电场以适应包括低电压在内的各种工况。 本研究从两个角度切入：风电基地与大电网出现各种工况的相互影响；风电基地中,风电机组与无功补偿装置的协调控制。 在静态条件下,为满足电网下达的电压优化曲线,明确酒泉风电基地中无功补偿装置对电网的影响,在PSD-BPA中定量分析了配置的动态无功补偿装置的容量与敦煌母线电压之间的关系。在动态条件下,明确几种常见工况酒泉风电基地中无功补偿装置对大电网的影响。在此基础上,对不同无功补偿装置对大电网的影响的不同进行定性分析,明确在三种典型工况中,低电压情况下无功补偿装置的作用最为明显,而在TCR/MCR型SVC, STATCOM三种无功补偿中STATCOM的效果最好。 基于STATCOM的工作原理与双馈风机网侧换流器的工作原理有相似之处,都能在一定的控制策略下向电网提供无功进而调节电网电压。故针对双馈风电场中STATCOM与低电压穿越的影响提出协调控制策略,在PSCAD/EMTDC中建立仿真模型以验证协调控制策略能有效提高风电场低电压穿越能力。
[Abstract]:With the development of clean energy and the increasing proportion of wind power, wind power base has more and more influence on large power grid. Dynamic reactive power compensator has a long history and mature technology. Adding reactive power compensator in wind farm can effectively regulate the voltage of power grid and keep the power network stable. Low voltage is one of the most common conditions in power system, so a control strategy is urgently needed to coordinate dynamic reactive power compensation and wind farm in wind power base to adapt to all kinds of working conditions, including low voltage. In this paper, two aspects are discussed: the interaction between wind power base and large power grid, and the coordinated control between wind turbine and reactive power compensator in wind power base. Under static condition, in order to satisfy the voltage optimization curve of power grid, the influence of reactive power compensation device in Jiuquan wind power base on power grid is clarified. The relationship between the capacity of the dynamic reactive power compensator and the voltage of Dunhuang bus is quantitatively analyzed in PSD-BPA. Under dynamic conditions, the influence of reactive power compensation device on large power grid in several common conditions of Jiuquan wind power base is determined. On this basis, the effects of different reactive power compensators on large power grids are analyzed qualitatively. It is clear that in the three typical conditions, the effect of reactive power compensator is the most obvious in the case of low voltage. But in the TCR/MCR SVC, STATCOM three kinds of reactive power compensation, the best effect of STATCOM. The working principle based on STATCOM is similar to that of doubly-fed fan grid-side converter. Both of them can provide reactive power to the power network under certain control strategy and then adjust the network voltage. Therefore, a coordinated control strategy is proposed for the influence of STATCOM and low voltage traversing in doubly-fed wind farms, and a simulation model is established in PSCAD/EMTDC to verify that the coordinated control strategy can effectively improve the low-voltage traversing capability of wind farms.
【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】：TM614
本文编号：2150208
[Abstract]:With the development of clean energy and the increasing proportion of wind power, wind power base has more and more influence on large power grid. Dynamic reactive power compensator has a long history and mature technology. Adding reactive power compensator in wind farm can effectively regulate the voltage of power grid and keep the power network stable. Low voltage is one of the most common conditions in power system, so a control strategy is urgently needed to coordinate dynamic reactive power compensation and wind farm in wind power base to adapt to all kinds of working conditions, including low voltage. In this paper, two aspects are discussed: the interaction between wind power base and large power grid, and the coordinated control between wind turbine and reactive power compensator in wind power base. Under static condition, in order to satisfy the voltage optimization curve of power grid, the influence of reactive power compensation device in Jiuquan wind power base on power grid is clarified. The relationship between the capacity of the dynamic reactive power compensator and the voltage of Dunhuang bus is quantitatively analyzed in PSD-BPA. Under dynamic conditions, the influence of reactive power compensation device on large power grid in several common conditions of Jiuquan wind power base is determined. On this basis, the effects of different reactive power compensators on large power grids are analyzed qualitatively. It is clear that in the three typical conditions, the effect of reactive power compensator is the most obvious in the case of low voltage. But in the TCR/MCR SVC, STATCOM three kinds of reactive power compensation, the best effect of STATCOM. The working principle based on STATCOM is similar to that of doubly-fed fan grid-side converter. Both of them can provide reactive power to the power network under certain control strategy and then adjust the network voltage. Therefore, a coordinated control strategy is proposed for the influence of STATCOM and low voltage traversing in doubly-fed wind farms, and a simulation model is established in PSCAD/EMTDC to verify that the coordinated control strategy can effectively improve the low-voltage traversing capability of wind farms.
【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】：TM614
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