CN110311415B - 一种可再生能源发电基地的暂态稳定裕度评估方法 - Google Patents
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Abstract
Description
技术领域
本发明涉及一种用于双馈感应风电并网***、逆变器型风电并网***(如永磁直驱风电***)以及光伏发电并网***在电网短路故障下的暂态失稳判据及其暂态稳定裕度量化评估方法,提出了低电压穿越过程中可再生能源发电基地的暂态失稳判据和可量化的暂态稳定裕度指标。
背景技术
随着风电、光伏等可再生能源的快速发展,大规模风电场和光伏发电站的规划和建设越来越多。但是可再生能源发电设备的电力电子化程度较高,其运行特性与传统同步发电机迥异,为可再生能源发电基地的稳定性分析带来了极大的复杂性。尤其在电网发生短路故障时,传统电力***的暂态失稳判据及其暂态稳定裕度评判方法很难适用于可再生能源发电基地本身。因此,亟需提出一种适用于可再生能源发电基地的暂态失稳判据和暂态稳定裕度量化评估方法。目前国内外学者已展开了相关研究,如已公开的下列文献:
[1]Jiabing Hu,Bo Wang,Weisheng Wang,Haiyan Tang,Yongning Chi,and QiHu.Small Signal Dynamics of DFIG-Based Wind Turbines During Riding ThroughSymmetrical Faults in WeakAC Grid[J].IEEE Transactions on Energy Conversion,2017,32(2):720-730.
[2]Bo Wen,Dong Dong,Dushan Boroyevich,Rolando Burgos,PaoloMattavelli,and Zhiyu Shen.Impedance-based analysis of grid-synchronizationstability for three-phase paralleled converters[J].IEEE Transactions on PowerElectronics,2016,31(1):26-38.
文献[1]利用复转矩系数法分析了双馈并网***的锁相环及电流环控制参数对弱电网严重故障下双馈风力发电***小信号稳定性的影响。文献[2]利用阻抗建模法评估了锁相环的动态性能对并网逆变器***动态稳定性的影响。上述文献均着眼于可再生能源发电设备的小信号稳定性,并没有涉及***的暂态稳定性的分析与评估。实际上,在电网发生严重短路故障时,可再生能源发电基地的输出潮流与线路阻抗的交互作用可能导致***不存在平衡点,从而导致可再生能源发电基地发生暂态失稳,进而崩溃脱网。
发明内容
针对现有技术存在的上述不足,本发明的目的在于提出一种适用于可再生能源发电基地在低电压穿越期间的暂态稳定裕度评估方法,本方法能够根据电网电压跌落程度、可再生能源发电基地的有功无功电流指令以及输电线路阻抗,判断***是否会发生暂态失稳,并计算出***的暂态稳定裕度值,为可再生能源发电基地暂态稳定性的量化评估提供依据。
本发明的技术方案是这样实现的:
一种适用于可再生能源发电基地在低电压穿越期间的暂态稳定裕度评估方法,用于判断在电网短路故障下双馈感应风电并网***、逆变器型风电并网***以及光伏发电并网***的暂态稳定性,并量化评估其暂态稳定裕度;其特征在于:具体评估步骤如下;
其中,X和R分别为并网点到故障点传输线路的等效感抗和电阻;
A3)将步骤A1)得到的|Uf|和步骤A2)得到的I*、θI*和θZ,按照下式计算暂态失稳边界Amax:
其中,Z为并网点到故障点传输线路的阻抗,Z=R+jX;
A4)将步骤A3)得到的Amax按照下式来量化计算可再生能源发电基地在故障期间的暂态稳定裕度:
其中,MTVA值为可再生能源发电基地在故障期间的暂态稳定裕度评估值,MTVA值越大,***的暂态稳定裕度越大,失稳风险越小;
A5)按照下式作为可再生能源发电基地在故障期间发生暂态失稳的判据:
与现有技术相比,本发明具有如下有益效果:
本发明能够根据电网电压跌落程度、可再生能源发电基地的有功无功电流指令以及输电线路阻抗,判断***是否会发生暂态失稳,并计算出***的暂态稳定裕度值,可用于双馈感应风电并网***、逆变器型风电并网***(如永磁直驱风电***)以及光伏发电并网***在电网短路故障下的暂态失稳判据,及其暂态稳定裕度量化评估,为可再生能源的发展、规划、建设以及电网的调度指令提供了指导性的建议。
附图说明
图1为双馈感应风电场接入电力***的结构示意图。
图2为电网电压跌落到20%,MTVA=-0.2°时,双馈型风电基地的仿真波形图。
图3为电网电压跌落到20%,MTVA=28.2°时,双馈型风电基地的仿真波形图。
具体实施方式
以下结合附图对本发明的具体实施方案做详细描述。
以双馈型风电场为例,图1为200MVA双馈型风电***接入电力***的结构示意图。
本发明一种适用于可再生能源发电基地在低电压穿越期间的暂态稳定裕度评估方法,用于判断在电网短路故障下双馈感应风电并网***、逆变器型风电并网***以及光伏发电并网***的暂态稳定性,并量化评估其暂态稳定裕度。本评估方法综合考虑了暂态电压稳定性与暂态功角稳定性,具体评估步骤如下;
其中,X和R分别为并网点PCC到故障点传输线路的等效感抗和电阻;
其中,Z为并网点到故障点传输线路的阻抗,Z=R+jX;
A4)将步骤A3)得到的Amax按照下式来量化计算可再生能源发电基地在故障期间的暂态稳定裕度:
其中,MTVA值为可再生能源发电基地在故障期间的暂态稳定裕度评估值,MTVA值越大,***的暂态稳定裕度越大,失稳风险越小;
A5)按照下式作为可再生能源发电基地在故障期间发生暂态失稳的判据:
本发明效果说明:
图2和图3分别给出了电网电压跌落到20%,MTVA=-0.2°和MTVA=28.2°时双馈风电基地的仿真波形对比图。图中0.4s电网发生三相短路故障,0.5s~1.1s为故障持续阶段,由图2可知,当MTVA<0时,双馈风电基地发生暂态失稳,严重威胁了电网的安全稳定运行能力。由图3可知,当MTVA>0时,***处于暂态稳定运行区域,并拥有28.2°的暂态稳定裕度,双馈风电基地能够在低电压穿越期间实现安全稳定运行。
综上,本发明所述的一种适用于可再生能源发电基地在低电压穿越期间的暂态稳定裕度评估方法既可以作为电网故障下可再生能源发电基地的暂态失稳判据,也可以量化衡量其暂态稳定裕度。
最后需要说明的是,本发明的上述实例仅仅是为说明本发明所作的举例,而并非是对本发明的实施方式的限定。尽管申请人参照较佳实施例对本发明进行了详细说明,对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其他不同形式的变化和变动。这里无法对所有的实施方式予以穷举。凡是属于本发明的技术方案所引申出的显而易见的变化或变动仍处于本发明的保护范围之列。
Claims (1)
1.一种适用于可再生能源发电基地在低电压穿越期间的暂态稳定裕度评估方法,用于判断在电网短路故障下双馈感应风电并网***、逆变器型风电并网***以及光伏发电并网***的暂态稳定性,并量化评估其暂态稳定裕度;其特征在于:具体评估步骤如下;
其中,X和R分别为并网点到故障点传输线路的等效感抗和电阻;
其中,Z为并网点到故障点传输线路的阻抗,Z=R+jX;
A4)将步骤A3)得到的Amax按照下式来量化计算可再生能源发电基地在故障期间的暂态稳定裕度:
其中,MTVA值为可再生能源发电基地在故障期间的暂态稳定裕度评估值,MTVA值越大,***的暂态稳定裕度越大,失稳风险越小;
A5)按照下式作为可再生能源发电基地在故障期间发生暂态失稳的判据:
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