电池储能在改善并网风电场电能质量和稳定性中的应用研究
发布时间：2018-10-16 11:50
【摘要】：风能是目前应用最广泛的可再生能源,为了大规模有效地利用风力发电,风电场必须并网运行,然而由于风能的强随机性,大规模风电并网后会给电网的频率稳定、电压稳定以及电能质量带来不利的影响。电池储能系统具有快速的有功/无功吞吐能力,应用到风电并网中,可以平滑风电功率波动,也可以给风电场提供一定的无功支持,参与风电场公共接入点的自动电压控制。然而由于电池储能系统一直没有有效可行的标幺化方法,在研究并网电池储能系统时,只能用有名值模型研究储能系统,给分析带来较多不便。因此,本文针对上述问题,进行了以下研究工作： 第一,本文根据电池储能系统的有名值模型,将电池储能系统的变流器近似为变比等于调制比的理想变压器,建立了电池储能系统的标幺化模型,给出了标幺化的等值电路,分析了其开环响应特性,并在此基础上设计了电池储能系统的直接功率控制器。 第二,将电池储能应用到风电功率平滑后,考虑到风电功率的波动性以及储能系统的响应特性,本文对风电功率进行了灰色超短期预测,并采用低通滤波作为基本滤波控制方法,结合蓄电池的荷电状态和风机输出功率的变化值,设计了模糊控制器,可调节滤波时间常数,逐渐改变电池输出功率,使荷电状态稳定在限定范围内的同时,尽可能地平滑风机的输出功率。 第三,在风电场公共接入点AVC的应用中,本文参考常规变电站综合无功控制的九区法和五区法原理,通过一定的线性化处理,建立了风电场运行的五区图,按照分层原则将AVC系统分为整定计算层、控制决策层和BESS控制模块,并设计了基于BESS的风电场AVC控制策略。 第四,本文在SIMULINK环境下建立了双馈风机和BESS的仿真模型,并进行了基于BESS的风电场有功平滑和AVC仿真。仿真结果表明应用本文设计的有功平滑和AVC控制策略,可以有效平抑风电功率波动,在AVC中可以使风电场公共接入点的电压-无功保持在期望的状态。
[Abstract]:Wind energy is the most widely used renewable energy at present. In order to make full use of wind power generation on a large scale, wind farm must be grid-connected. However, because of the strong randomness of wind energy, the frequency of large-scale wind power grid will be stable after grid connection. Voltage stability and power quality have a negative impact. The battery energy storage system has the ability of quick active / reactive power huff and puff. When applied to wind power grid, it can smooth the fluctuation of wind power, provide certain reactive power support to wind farm, and participate in the automatic voltage control of public access point of wind farm. However, since there has been no effective and feasible standardization method for battery energy storage system, in the study of grid-connected battery energy storage system, we can only use the named value model to study the energy storage system, which brings more inconvenience to the analysis. Therefore, the following research work has been done in this paper: firstly, according to the famous value model of battery energy storage system, the converter of battery energy storage system is approximate to an ideal transformer with variable ratio equal to modulation ratio. The standard unitary model of battery energy storage system is established, the equivalent circuit of standardization is given, the open-loop response characteristic is analyzed, and the direct power controller of battery energy storage system is designed. Secondly, after the battery energy storage is applied to the wind power smoothing, considering the fluctuation of the wind power and the response characteristics of the energy storage system, the grey ultra-short term prediction of the wind power is carried out in this paper. Using low pass filter as the basic filter control method, combined with the charge state of battery and the change value of fan output power, a fuzzy controller is designed, which can adjust the filter time constant, and gradually change the battery output power. The state of charge is stabilized within a limited range, and the output power of the fan is smoothed as much as possible. Thirdly, in the application of AVC, a five-zone diagram of wind farm operation is established by referring to the principle of nine-zone method and five-zone method of integrated reactive power control in conventional substations. According to the principle of stratification, the AVC system is divided into four layers: setting calculation layer, control decision layer and BESS control module. The AVC control strategy of wind farm based on BESS is designed. Fourthly, the simulation model of doubly-fed fan and BESS is established in SIMULINK environment, and the active power smoothing and AVC simulation of wind farm based on BESS are carried out. The simulation results show that the active power smoothing and AVC control strategy designed in this paper can effectively suppress the fluctuation of wind power and keep the voltage-reactive power of the common access point of wind farm in the desired state in AVC.
【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：2274267
[Abstract]:Wind energy is the most widely used renewable energy at present. In order to make full use of wind power generation on a large scale, wind farm must be grid-connected. However, because of the strong randomness of wind energy, the frequency of large-scale wind power grid will be stable after grid connection. Voltage stability and power quality have a negative impact. The battery energy storage system has the ability of quick active / reactive power huff and puff. When applied to wind power grid, it can smooth the fluctuation of wind power, provide certain reactive power support to wind farm, and participate in the automatic voltage control of public access point of wind farm. However, since there has been no effective and feasible standardization method for battery energy storage system, in the study of grid-connected battery energy storage system, we can only use the named value model to study the energy storage system, which brings more inconvenience to the analysis. Therefore, the following research work has been done in this paper: firstly, according to the famous value model of battery energy storage system, the converter of battery energy storage system is approximate to an ideal transformer with variable ratio equal to modulation ratio. The standard unitary model of battery energy storage system is established, the equivalent circuit of standardization is given, the open-loop response characteristic is analyzed, and the direct power controller of battery energy storage system is designed. Secondly, after the battery energy storage is applied to the wind power smoothing, considering the fluctuation of the wind power and the response characteristics of the energy storage system, the grey ultra-short term prediction of the wind power is carried out in this paper. Using low pass filter as the basic filter control method, combined with the charge state of battery and the change value of fan output power, a fuzzy controller is designed, which can adjust the filter time constant, and gradually change the battery output power. The state of charge is stabilized within a limited range, and the output power of the fan is smoothed as much as possible. Thirdly, in the application of AVC, a five-zone diagram of wind farm operation is established by referring to the principle of nine-zone method and five-zone method of integrated reactive power control in conventional substations. According to the principle of stratification, the AVC system is divided into four layers: setting calculation layer, control decision layer and BESS control module. The AVC control strategy of wind farm based on BESS is designed. Fourthly, the simulation model of doubly-fed fan and BESS is established in SIMULINK environment, and the active power smoothing and AVC simulation of wind farm based on BESS are carried out. The simulation results show that the active power smoothing and AVC control strategy designed in this paper can effectively suppress the fluctuation of wind power and keep the voltage-reactive power of the common access point of wind farm in the desired state in AVC.
【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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