WO2021047389A1 - 组串式逆变器的控制方法、装置、系统及存储介质 - Google Patents
组串式逆变器的控制方法、装置、系统及存储介质 Download PDFInfo
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Abstract
Description
多个时刻 | 输入电压 | 输出电压的参考值 |
第1时刻 | Ul(t1) | Umax(t1) |
第2时刻 | 0.5Ul(t1) | Umax(t1) |
第3时刻 | 0.4Ul(t1) | 0.75Umax(t1) |
第4时刻 | 0 | 0.75Umax(t1) |
Claims (15)
- 一种组串式逆变器的控制方法,其特征在于,所述组串式逆变器包括一路或多路第一直流/直流升压电路、一路或多路第二直流/直流升压电路、以及逆变电路,所述一路或多路第一直流/直流升压电路是指进行电流-电压IV曲线扫描的直流/直流升压电路,所述一路或多路第二直流/直流升压电路是指不进行IV曲线扫描的直流/直流升压电路,所述方法包括:在对所述一路或多路第一直流/直流升压电路进行IV曲线扫描的过程中,控制所述逆变电路的输出功率为参考功率以及控制所述一路或多路第二直流/直流升压电路的输出电压的变化,所述一路或多路第二直流/直流升压电路的输出电压的变化趋势与所述一路或多路第一直流/直流升压电路在IV曲线扫描过程中的输入电压的变化趋势呈现非严格单调递增关系。
- 如权利要求1所述的方法,其特征在于,所述控制所述一路或多路第二直流/直流升压电路的输出电的变化,包括:对于所述一路或多路第二直流/直流升压电路中任一路第二直流/直流升压电路,根据所述任一路第二直流/直流升压电路每个时刻上的输出电压的参考值,调整同一时刻时所述任一路第二直流/直流升压电路的输出电压的实际值,直至每个时刻上所述任一路第二直流/直流升压电路的输出电压的实际值与同一时刻上的输出电压的参考值之间的差值的绝对值小于差值阈值;所述任一路第二直流/直流升压电路在所述IV曲线扫描过程中的各个时刻上的输出电压的参考值的变化趋势和所述一路或多路第一直流/直流升压电路在所述IV曲线扫描过程中的输入电压在所述各个时刻上的变化趋势呈现非严格单调递增关系。
- 如权利要求2所述的方法,其特征在于,所述根据所述任一路第二直流/直流升压电路每个时刻上的输出电压的参考值,调整同一时刻时所述任一路第二直流/直流升压电路的输出电压的实际值,包括:对于所述IV曲线扫描过程中任一时刻,如果所述任一时刻上的输出电压的参考值和所述任一时刻时所述任一路第二直流/直流升压电路的输出电压的实际值之间的差值大于所述参考阈值,则增大所述任一路第二直流/直流升压电路从所连接的光伏组串中抽取的功率;或者,如果所述任一时刻时所述任一路第二直流/直流升压电路的输出电压的实际值和所述任一时刻上的输出电压的参考值之间的差值大于所述参考阈值,则减小所述任一路第二直流/直流升压电路从所连接的光伏组串中抽取的功率。
- 如权利要求1至3任一所述的方法,其特征在于,所述方法还包括:控制所述一路或多路第一直流/直流升压电路的开关频率的变化,所述开关频率的变化趋势与所述一路或多路第一直流/直流升压电路在IV曲线扫描过程中的输入电压的变化趋势呈现非严格单调递减关系。
- 如权利要求4所述的方法,其特征在于,所述控制所述一路或多路第一直流/直流升 压电路的开关频率的变化,包括:对于所述一路或多路第一直流/直流升压电路中任一路第一直流/直流升压电路,在IV曲线扫描过程中的多个时刻上的任一时刻,如果所述任一时刻时所述任一路第一直流/直流升压电路的输入电压小于上一时刻时所述任一路第一直流/直流升压电路的输入电压,则将所述任一时刻时所述任一路第一直流/直流升压电路的开关频率调整至大于或等于上一时刻时所述任一路第一直流/直流升压电路的开关频率;或者,如果所述任一时刻时所述任一路第一直流/直流升压电路的输入电压大于上一时刻时所述任一路第一直流/直流升压电路的输入电压,则将所述任一时刻时所述任一路第一直流/直流升压电路的开关频率调整至小于或等于上一时刻时所述任一路第一直流/直流升压电路的开关频率。
- 如权利要求1至5任一所述的方法,其特征在于,所述方法还包括:在对所述一路或多路第一直流/直流升压电路进行IV曲线扫描之前,获取所述组串式逆变器包括的每路直流/直流升压电路的最大输入功率;确定所述组串式逆变器包括的各路直流/直流升压电路中每路直流/直流升压电路的最大输入功率的和;将确定的加和值与功率损耗系数相乘,得到理论输出功率;根据所述理论输出功率确定所述参考功率,所述参考功率与所述理论输出功率之间的差值小于功率阈值。
- 一种组串式逆变器的控制装置,其特征在于,所述组串式逆变器包括一路或多路第一直流/直流升压电路、一路或多路第二直流/直流升压电路、以及逆变电路,所述一路或多路第一直流/直流升压电路是指进行电流-电压IV曲线扫描的直流/直流升压电路,所述一路或多路第二直流/直流升压电路是指不进行IV曲线扫描的直流/直流升压电路,所述装置包括:第一控制模块,用于在对所述一路或多路第一直流/直流升压电路进行IV曲线扫描的过程中,控制所述逆变电路的输出功率为参考功率;第二控制模块,用于在对所述一路或多路第一直流/直流升压电路进行IV曲线扫描的过程中,控制所述一路或多路第二直流/直流升压电路的输出电压的变化,所述一路或多路第二直流/直流升压电路的输出电压的变化趋势与所述一路或多路第一直流/直流升压电路在IV曲线扫描过程中的输入电压的变化趋势呈现非严格单调递增关系。
- 如权利要求7所述的装置,其特征在于,所述第二控制模块包括:调整单元,用于在对所述一路或多路第一直流/直流升压电路进行IV曲线扫描的过程中,对于所述一路或多路第二直流/直流升压电路中任一路第二直流/直流升压电路,根据所述任一路第二直流/直流升压电路每个时刻上的输出电压的参考值,调整同一时刻时所述任一路第二直流/直流升压电路的输出电压的实际值,直至每个时刻上所述任一路第二直流/直流升压电路的输出电压的实际值与同一时刻上的输出电压的参考值之间的差值的绝对值小于差值阈值;所述任一路第二直流/直流升压电路在所述IV曲线扫描过程中的各个时刻上的输出电压的参考值的变化趋势和所述一路或多路第一直流/直流升压电路在所述IV曲线扫描过程中的 输入电压在所述各个时刻上的变化趋势呈现非严格单调递增关系。
- 如权利要求8所述的装置,其特征在于,所述调整单元用于:对于所述IV曲线扫描过程中任一时刻,如果所述任一时刻上的输出电压的参考值和所述任一时刻时所述任一路第二直流/直流升压电路的输出电压的实际值之间的差值大于所述参考阈值,则增大所述任一路第二直流/直流升压电路从所连接的光伏组串中抽取的功率;或者,如果所述任一时刻时所述任一路第二直流/直流升压电路的输出电压的实际值和所述任一时刻上的输出电压的参考值之间的差值大于所述参考阈值,则减小所述任一路第二直流/直流升压电路从所连接的光伏组串中抽取的功率。
- 如权利要求7至9任一所述的装置,其特征在于,所述装置还包括:第三控制模块,用于在对所述一路或多路第一直流/直流升压电路进行IV曲线扫描的过程中,控制所述一路或多路第一直流/直流升压电路的开关频率的变化,所述开关频率的变化趋势与所述一路或多路第一直流/直流升压电路在IV曲线扫描过程中的输入电压的变化趋势呈现非严格单调递减关系。
- 如权利要求10所述的装置,其特征在于,所述第三控制模块用于:对于所述一路或多路第一直流/直流升压电路中任一路第一直流/直流升压电路,在IV曲线扫描过程中的多个时刻上的任一时刻,如果所述任一时刻时所述任一路第一直流/直流升压电路的输入电压小于上一时刻时所述任一路第一直流/直流升压电路的输入电压,则将所述任一时刻时所述任一路第一直流/直流升压电路的开关频率调整至大于或等于上一时刻时所述任一路第一直流/直流升压电路的开关频率;或者,如果所述任一时刻时所述任一路第一直流/直流升压电路的输入电压大于上一时刻时所述任一路第一直流/直流升压电路的输入电压,则将所述任一时刻时所述任一路第一直流/直流升压电路的开关频率调整至小于或等于上一时刻时所述任一路第一直流/直流升压电路的开关频率。
- 如权利要求7至11任一所述的装置,其特征在于,所述装置还包括:获取模块,用于在对所述一路或多路第一直流/直流升压电路进行IV曲线扫描之前,获取所述组串式逆变器包括的每路直流/直流升压电路的最大输入功率;第一确定模块,用于确定所述组串式逆变器包括的各路直流/直流升压电路中每路直流/直流升压电路的最大输入功率的和;第二确定模块,用于将确定的加和值与功率损耗系数相乘,得到理论输出功率;第三确定模块,用于根据所述理论输出功率确定所述参考功率,所述参考功率与所述理论输出功率之间的差值小于功率阈值。
- 一种组串式逆变器的控制器,其特征在于,所述控制器被配置为执行权利要求1-6任一项所述的方法。
- 一种组串式逆变器的控制系统,其特征在于,所述系统包括组串式逆变器和控制器;所述控制器与所述组串式逆变器包括的各路直流/直流升压电路中每路直流/直流升压电路连接,所述控制器被配置为执行权利要求1-6任一项所述的方法。
- 一种计算机可读存储介质,所述计算机可读存储介质中存储有指令,当其在计算机上运行时,使得计算机执行权利要求1-6任一项所述的方法。
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AU2020346195A AU2020346195B2 (en) | 2019-09-09 | 2020-08-26 | Method, apparatus, and system for controlling string inverter, and storage medium |
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