CN106093721A - 发电系统中的电弧检测和预防 - Google Patents
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Abstract
本申请涉及发电系统的电弧检测和预防。一种用于在包括光伏板和利用DC输电线与所述光伏板可连接的负载的系统中的电弧检测的方法。所述方法测量传递到所述负载的功率,因而产生传递到所述负载的功率的第一测量结果。还测量通过所述光伏板产生的功率,因而产生通过所述光伏板产生的功率的第二测量结果。比较所述第一测量结果与所述第二测量结果,因而产生差分功率测量结果。当所述差分功率测量结果超过阈值时,还可以设置报警条件。优选地,调制所述第二测量结果并通过所述DC输电线传输所述第二测量结果。
Description
本申请是申请日为2011年11月08日,申请号为201110349734.7,发明名称为“发电系统中的电弧检测和预防”的申请的分案申请。
技术领域
本发明涉及分布式发电系统,特别涉及光伏发电系统的电弧检测和预防。
背景技术
分布式光伏发电系统包括通常安装在建筑物的屋顶上的一个或多个光伏板。连接到该光伏板的逆变器一般设置在建筑物内。从光伏板输出直流(DC)电力。逆变器将直流电力转换为交流(AC)电力。
电弧可以对电力分配系统和电子设备产生不利的影响。电弧可能发生在开关、断路器、继电器触点、保险丝和较差的电缆终端。当电路被断开或者在连接器发生不良连接时,可能在连接器的触点两端形成电弧放电。电弧放电是空气的电击穿,其产生不断的等离子放电,所述等离子放电由流过例如空气的介质(一般不导电)的电流产生。在刚刚断开时,两个触点之间的间隔距离很小。因此,在触点之间的空气间隙两端的电压产生非常大的电场,以伏/毫米为单位。该大电场导致引燃在断开的两侧之间的电弧。如果电路具有足够大的电流和电压来维持电弧,该电弧可以导致对装置的损坏,例如导体的融化、绝缘层的破坏、以及着火。
交流(AC)电力系统的零交点可以导致电弧不会再点燃。因为在DC电力系统中没有零交点,所以直流系统可以比交流系统更易于形成电弧。
参考图1a,其示出了根据背景技术的在电路10a内的串联电弧106。在图1a内,直流(DC)电源102在输电线104a和104b之间供电。输电线104b示出在地电势。负载100连接输电线104b到输电线104a。串联电弧可以在电路10a的任何部分发生,例如在输电线104a、104b或者在负载100或者电源102内。示出在输电线104a的C点和A点之间断开或者接触不良,其导致串联电弧106的例子。通常地,如果能够检测到串联电弧106,可以启动设置在电源102或者负载100处的断路器(未示出)来阻止持续的串联电弧106。
参考图1b,其示出根据背景技术的在电路10b内的并联或者分流电弧108。在电路10b内,直流(DC)电源102在输电线104a和104b之间供电。负载100连接输电线104a和104b。并联电弧可以在电路10b的许多部分发生,例子可以包括在电源102的正极和电源102的接地端/底架之间的电弧,如果供电线104a/b是双芯电缆;电弧形成可以在双芯之间、或者在负载100的正极端104a和地线端104b之间发生。并联电弧108可以如示出的在输电线104b的D点和在输电线104a上高电势的C点之间发生。
电弧噪声近似于白噪声,意思是功率谱密度在整个频谱上近似均匀分布。另外,电弧噪声信号的幅度具有非常近似的高斯概率密度函数。均方根(RMS)电弧噪声电压信号(Vn)通过公式1给出。
其中,
K=波尔兹曼常数=1.38x 10-23焦耳每开尔文
T=以开尔文度为单位的温度
B=测量噪声电压(VN)的带宽,以赫兹(Hz)为单位
R=电阻器/电路/负载的电阻(欧姆)
发明内容
根据本发明,提供了一种用于在包括光伏板和利用DC输电线与所述光伏板可连接的负载的系统中的电弧检测的方法。所述方法测量传递到所述负载的功率,因而产生传递到所述负载的功率的第一测量结果。还测量通过所述光伏板产生的功率,因而产生通过所述光伏板产生的功率的第二测量结果。比较所述第一测量结果与所述第二测量结果,因而产生差分功率测量结果。当所述差分功率测量结果超过阈值时,可以还设置报警条件。所述第二测量结果优选地被调制并通过所述DC输电线传输。
根据本发明,提供了一种用于在包括光伏板和利用DC输电线与所述光伏板可连接的负载的系统中的电弧检测的设备。所述设备包括适合测量所述光伏板产生的功率的电子模块和适合测量传递到所述负载的功率的中央控制器。一机构比较所述光伏板的功率输出与传递到所述负载的功率。
根据本发明,提供了一种用于在包括具有光伏板的光伏串和利用DC输电线与所述光伏串可连接的负载的系统中的电弧检测的方法。用于电弧检测的所述方法测量所述负载的噪声电压,因而产生所述负载的噪声电压的第一测量结果。还测量在所述光伏串中的所述光伏板的噪声电压,因而产生所述光伏板的噪声电压的第二测量结果。优选地比较所述第一测量结果与所述第二测量结果,因而产生差分噪声电压结果。当所述差分噪声电压结果超过阈值时,则可以设置报警条件。当设置了所述报警条件时,可以断开所述光伏串。所述第二测量结果优选地被调制并通过所述DC输电线传输。
根据本发明,提供了一种用于在包括互联的光伏板的光伏串和利用DC输电线与所述光伏串可连接的负载的系统中的电弧检测的方法。用于电弧检测的所述方法测量传递到所述负载的功率,因而产生所述负载的功率的第一测量结果。还测量所述光伏串产生的功率,因而产生所述光伏串的功率的第二测量结果。所述第一测量结果可以与所述第二测量结果比较,因而产生第一差分功率结果。
所述测量所述光伏串的功率通常包括发送指令来测量每一个光伏板的功率输出。然后可以传输并接收每一个光伏板的功率值。可以将每一个光伏板的功率值相加,因而提供所述第二测量结果。然后可以接着调制所述第二测量结果并通过所述DC输电线传输所述第二测量结果。
所述负载的阻抗可以根据预定值来改变。然后再次测量所述光伏串的功率,因而产生所述光伏串的功率的第三测量结果。接下来测量所述负载的功率,因而产生所述负载的功率的第四测量结果。可以比较所述第三测量结果与所述第四测量结果,因而产生第二差分功率结果。可以比较所述第一差分功率结果与所述第二差分功率结果,因而产生总的差分功率结果。当所述总的差分功率结果超过阈值时,可以设置报警条件。当设置了所述报警条件时,可以断开所述光伏串。所述第三测量结果优选地被调制并通过所述DC输电线传输。
所述测量所述光伏串的功率通常包括发送指令来测量每一个光伏板的功率。然后可以传输并接收每一个光伏板的功率值。可以将每一个光伏板的功率值相加,因而提供所述第三测量结果。然后可以接着调制并通过所述DC输电线传输所述第三测量结果。
可以发送测量在所述串内的功率的指令到连接到所述串的板之一的主模块。指示分别连接到所述串的其他板的从模块测量功率。将功率测量结果从所述从模块向所述主模块传输。通过所述主模块接收所述功率测量结果,通过所述主模块求和来产生向中央控制器传输的串功率结果。
根据本发明的一种实施方式,一种用于在包括光伏板和利用DC输电线与所述光伏板可连接的负载的系统中的电弧检测的方法,用于电弧检测的所述方法包括:测量传递到所述负载的功率,因而产生传递到所述负载的所述功率的第一测量结果;测量通过所述光伏板产生的功率,因而产生通过所述光伏板产生的功率的第二测量结果;比较所述第一测量结果与所述第二测量结果,因而产生差分功率测量结果;当所述差分功率测量结果超过阈值时,则设置报警条件。
在一种实施方案中,其中,所述第二测量结果被调制并通过所述DC输电线进行传输。
根据本发明的另一种实施方式,一种被配置成用于在包括光伏板和利用DC输电线与所述光伏板可连接的负载的系统中的电弧检测的设备,所述设备包括:电子模块,其适于测量所述光伏板的功率输出;以及控制器,其适于测量传递到所述负载的功率;以及用于比较所述光伏板的所述功率输出与传递到所述负载的所述功率的机构,其中如果所述光伏板的功率输出大于传递到所述负载的所述功率,则所述机构可操作来检测电弧。
根据本发明的一种实施方式,一种用于在包括具有光伏板的光伏串和利用DC输电线与所述光伏串可连接的负载的系统中的电弧检测的方法,用于电弧检测的所述方法包括:测量所述负载的噪声电压,因而产生所述负载的所述噪声电压的第一测量结果;测量在所述光伏串中的所述光伏板的噪声电压,因而产生所述光伏板的所述噪声电压的第二测量结果;比较所述第一测量结果与所述第二测量结果,因而产生差分噪声电压结果;当所述差分噪声电压结果超过阈值时,则设置报警条件。
在一种实施方案中,所述的方法,还包括:当设置了所述报警条件时,断开所述光伏串。在一种实施方案中,其中所述第二测量结果被调制并通过所述DC输电线进行传输。
根据本发明的一种实施方式,一种用于在包括互联的光伏板的光伏串和利用DC输电线与所述光伏串可连接的负载的系统中的电弧检测的方法,用于电弧检测的所述方法包括:测量传递到所述负载的功率,因而产生所述负载的所述功率的第一测量结果;测量所述光伏串的功率,因而产生所述光伏串的所述功率的第二测量结果;比较所述第一测量结果与所述第二测量结果,因而产生第一差分功率结果,并且当所述光伏串的功率大于传递到所述负载的功率时,则根据预先定义的标准设置第一报警条件。
在一种实施方案中,其中所述测量所述光伏串的所述功率包括:发送指令来测量每一个光伏板的功率,以产生每一个光伏板的功率值;传输每一个光伏板的所述功率值;接收每一个光伏板的所述功率值;将每一个光伏板的所述功率值相加,因而提供所述第二测量结果;以及调制所述第二测量结果并通过所述DC输电线传输所述第二测量结果。在一种实施方案中,还包括:根据预定值改变所述负载的阻抗;使用所述负载的改变的阻抗测量所述光伏串的功率,因而产生所述光伏串的所述功率的第三测量结果;使用所述负载的改变的阻抗测量所述负载的功率,因而产生所述负载的所述功率的第四测量结果;比较所述第三测量结果与所述第四测量结果,因而产生第二差分功率结果;比较所述第一差分功率结果与所述第二差分功率结果,因而产生总的差分功率结果;当所述总的差分功率结果超过阈值时,则设置第二报警条件。
在一种实施方案中,其中所述测量所述光伏串的功率包括:发送指令来测量所述光伏串的每一个光伏板的功率,以产生每一个光伏板的功率值;传输每一个光伏板的所述功率值;接收每一个光伏板的所述功率值;将每一个光伏板的所述功率值相加,因而提供所述第三测量结果;以及调制所述第三测量结果并通过所述DC输电线传输所述第三测量结果。在一种实施方案中,还包括:当设置了所述第二报警条件时,断开所述光伏串。在一种实施方案中,其中所述第三测量结果被调制并通过所述DC输电线传输。
在一种实施方案中,还包括:向连接到所述光伏串的所述光伏板之一的主模块发送指令;指示分别连接到所述光伏串的其他光伏板的从模块测量功率;从所述从模块向所述主模块传输功率测量结果;通过所述主模块接收所述功率测量结果;通过所述主模块将所述光伏串的所述光伏板的功率测量结果加起来以产生串功率结果;以及向控制器传输所述串功率结果。
附图说明
本文仅通过实例并参考附图来说明本发明,其中:
图1a示出根据背景技术的串联电弧形成的电路。
图1b示出根据背景技术的具有并联或者分流电弧形成的与图1a相同的电路。
图2示出根据本发明的实施方式的包括电弧检测特征的发电系统。
图3示出根据本发明的实施方式的方法。
图4示出根据本发明的实施方式的方法。
图5a示出根据本发明的实施方式的发电电路。
图5b示出根据本发明的实施方式的方法。
图5c更加详细地示出了在图5b中示出的根据本发明的实施方式的方法步骤,该步骤测量串功率。
图5d示出根据本发明的另一个实施方式的用于串联电弧检测的方法。
具体实施方式
现在将详细介绍本发明的实施方式,其例子在附图中示出,其中相似的参考数字指的是相似的元件。下面通过参考附图说明实施方式来解释本发明。
现在参考图2,其示出根据本发明的实施方式的包括电弧检测特征的发电系统201。光伏板200优选地连接到模块202的输入。多个板200和多个模块202通常被连接在一起来形成串联串(serial string)。该串联串通过串联地连接模块202的输出形成。多个串联串优选地并联连接到负载250的两端。负载250优选是直流(DC)到交流(AC)逆变器或者DC到DC转换器。电子模块202通常测量由板200产生的电压和电流。因而,模块202能够指示板200的功率输出。控制器204连接到负载250。控制器204还经由通过DC输电线的输电线通信或者通过无线连接与模块202可操作地连接,DC输电线连接负载250到串联串。控制器204优选经由传感器206测量由负载250接收到的功率。每一个板200具有可以连接到地线的底架。串联电弧106的例子在两个板200之间示出。并联电弧108的例子在板200的正极端和板200的地线之间示出。
现在参考图3,其示出根据本发明的实施方式的方法301。方法301是用于检测串联和/或并联电弧的方法。中央控制器204测量被负载250接收到的功率(步骤300)。模块202测量板200的功率(步骤302)。模块202优选地经由无线或者输电线通信向控制器204传输表示测量的板200的功率的数据。控制器204计算在板200处产生的功率和在负载250处接收到的功率的差(步骤304)。如果在步骤304计算出的差示出,根据预定义的标准,在板200处产生的功率大于在负载250处接收的功率(步骤306),则可以设置潜在电弧的报警条件(步骤308)。否则,电弧检测继续从步骤300开始。
现在参考图4,其示出根据本发明的实施方式的方法401。方法401是用于检测串联和/或并联电弧的方法。中央控制器204测量(步骤400)负载250的均方根(RMS)噪声电压。模块202测量(步骤402)板200的均方根(RMS)噪声电压。模块202优选地经由无线或者输电线通信向控制器204传输表示测量的板200的RMS噪声电压的数据。
控制器通常通过计算在板200处测量的噪声电压和在负载250处测量的噪声电压之间的差来比较在板200处的噪声电压和在负载250处的噪声电压(步骤404)。如果在步骤404计算出的差示出根据预定的标准在板200处测量的噪声电压大于在负载250处测量的噪声电压(步骤406),则可以设置潜在电弧的报警条件(步骤408)。
该比较(步骤404)还可以包括例如在发电系统201刚刚安装以后,比较在控制器204的存储器中之前储存的板200和负载250的RMS噪声电压水平。之前储存的板200和负载250的RMS噪声电压水平优选地以查找表的形式储存在控制器204的存储器中。查找表具有板200和负载250的例如在一天的不同时间、一周的不同天或者一年的时间的RMS噪声电压水平,其可以与当前测量的板200和负载250的RMS噪声电压水平比较。
如果测量的负载250的RMS噪声电压数据与测量的板200的RMS噪声电压数据的比较超过RMS噪声电压差的某一阈值(步骤406),则设置潜在电弧的报警条件(步骤408),否则电弧检测继续从步骤400开始。
现在参考图5a,其示出了根据本发明的实施方式的发电电路501a。发电电路501a将板200的输出连接到模块202的输入。因而板200的输出向模块202提供DC电力输入(PIN)。模块202可以包括例如降压电路、升压电路、或者升降压电路的直流(DC)到DC的切换式电力转换器。模块202的输出电压标记为Vi。
模块202和模块202a的输出被串联连接来形成串联串520。示出并联的两个串520。在一个串520中示出在串520中串联发生的电弧电压(VA)的情况。负载250优选地是DC到交流(AC)逆变器。中央控制器204连接到负载250。控制器204可选地测量负载250两端的电压(VT)以及经由电流传感器206测量负载250的电流。电流传感器206附接到控制器204并且通过输电线连接到负载250。
在第一种情况下,依赖于在板200上的太阳辐射,一些模块202可以运行来转换在输入侧的功率以提供固定的输出电压(Vi),并且模块202的输出功率依赖于流过串520的电流。流过串520的电流与板200的辐射水平相关,即辐射越大,串520内的电流越大,并且模块202的输出功率越大。
在第二种情况下,模块202可以运行来将在输入侧的功率转换为与输出侧相同的功率,因此例如,如果模块202的输入侧是200瓦,则模块202将尽力在输出侧具有200瓦。但是,因为模块202在串520内串联连接,根据基尔霍夫定律在串520内的电流是相同的。在串520内的电流相同,其意味着模块的输出电压(Vi)变化以便使得在模块202的输出侧的功率与在模块202的输入侧的功率相同。因而,当串520的电流增加时,模块202的输出电压(Vi)降低,或者,当串520的电流降低时,模块202的输出电压(Vi)增加直到最大值。当模块202的输出电压(Vi)增加到最大值时,在输出电压(Vi)目前被有效地固定方面,第二种情况与第一种情况类似。
在串520内的模块202可以具有主/从关系,一个模块202a被配置为主并且其他模块202被配置为从。
由于整个串520的电流相同,主模块通常配置成测量串520的电流。模块202可选地测量它们的输出电压Vi以便可以确定总的串功率。从模块202的输出电压可以被测量,并且通过例如无线或者通过输电线通信传递到主单元202a,以便从模块202a到控制器204的单个遥测足以传递串的输出功率。在串520内的主模块202a可以与其他从模块202通信来控制从模块202。主模块202a通常接收来自控制器204的“保持有效”信号,其被传递到从模块202。从控制器204发送的通过无线或者通过输电线通信传递的“保持有效”信号可以存在或者不存在。“保持有效”信号的存在可以导致模块202和/或经由主模块202a的持续操作。“保持有效”信号的不存在可以导致模块202和/或经由主模块202a的操作的中止(即流过串520的电流中止)。可以使用多个“保持有效”信号——每一个具有对应于每一个串520的不同的频率——以便特定的串520在存在电弧的情况时可以停止发电而其他串520继续发电。
现在参考图5b,其示出了根据本发明的实施方式的方法503。在步骤500,测量串520的功率。在步骤502,使用中央控制器204和传感器206测量负载250的功率。在步骤504,比较测量的负载功率和测量的串功率。参考图5a通过公式2数学上表示步骤500、502和504:
VTIL=∑PIN-VA[IL]IL∑ViIL 式2
其中,
VA[IL]=作为电流IL的函数的电弧电压
VT IL=负载250的功率
ΣPIN=当模块202运行以便模块的输出电压(Vi)变化以使得在模块202的输出侧的功率与在模块202的输入侧的功率(PIN)相同时,模块202的功率输出,以及
ΣVi IL=具有固定的电压输出(Vi)的模块202的功率输出和/或当串520的电流充分地降低以便模块202的输出电压(Vi)增加到最大输出电压水平值时,模块202(具有变化的输出电压Vi)的功率输出。在所有情况下,最大输出电压水平值(Vi)和固定的电压输出(Vi)被预先配置成在发电电路501a内相同。
串520的串功率和传递到负载250的功率(VT x I1)之间的比较通过从传递到负载250的功率(VT x I1)减去串520的功率(ΣPIN+ΣVi IL)的总和来产生差而实现。如果该差小于预定义的阈值(步骤506),对串520(步骤500)和负载250(步骤502)的可用功率的测量继续。在决策模块506,如果差大于预定义的阈值,那么可以设置报警条件并且可能发生串联电弧情况。串联电弧的情况通常导致“保持有效”信号从控制器204向模块202传输中止,其导致模块202关闭。模块202关闭是停止在串520内的串联电弧的优选方式。
现在参考图5c,其更加详细地示出根据本发明的实施方式的测量串502的功率的方法步骤500(在图5b中示出)。通常中央控制器204经由输电线通信向主模块202a发送指令(步骤550)。主模块202a测量串502的电流以及在主模块202a的输出侧的电压和/或在主模块202a的输入侧的电压和电流来分别地提供模块202a的输出功率和输入功率。主模块指示(步骤552)在串502内的从模块202测量输出电压和串502的电流和/或模块202的输入电压和电流来分别地提供模块202的输出功率和输入功率。从模块202然后向主模块202a传输(步骤554)在步骤552测量的输入和输出功率。主模块202a接收(步骤556)在步骤554传输的功率测量结果。主模块202a然后根据公式2将接收到的功率测量结果与由主模块202a进行的(步骤558)功率测量结果一起求和。根据公式2,ΣPIN=当模块202运行以便模块的输出电压(Vi)变化以使得在模块202的输出侧的功率与在模块202的输入侧的功率(PIN)相等时,模块202的功率输出;ΣVi IL=具有固定的电压输出(Vi)的模块202的功率输出和/或当串520的电流充分地降低以便模块202的输出电压(Vi)增加到最大输出电压水平值时,模块202(具有变化的输出电压Vi)的功率输出。在所有情况下,最大输出电压水平值(Vi)和固定的电压输出(Vi)被预先配置成在发电电路501a内相同。在步骤558求和的功率测量结果然后通过主模块202a传输到中央控制器204(步骤560)。
现在参考图5d,其示出根据本发明的另一个实施方式的用于串联电弧检测的方法505。第一差分功率结果(differential power result)508发生在电路501a内,其负载电流IL现在标记为电流I1并且其负载250两端(如在图5a中所示)的电压为VT。参考图5a和公式3(下面)产生第一差分功率结果508作为执行方法503(在图5c中示出)的结果。
VTI1=∑PIN-VA[I1]I1∑ViI1 式3
其中
VA[I1]=作为电流I1的函数的电弧电压。
VT I1=负载250的功率
ΣPIN=当模块202运行以便模块的输出电压(Vi)变化以使得在模块202的输出侧的功率与在模块202的输入侧的功率(PIN)相同时,模块202的功率输出,以及
ΣVi IL=具有固定的电压输出(Vi)的模块202的功率输出和/或当串520的电流充分地降低以便模块202的输出电压(Vi)增加到最大输出电压水平值时,模块202(具有变化的输出电压Vi)的功率输出。在所有情况下,最大输出电压水平值(Vi)和固定的电压输出(Vi)被预先配置成在发电电路501a内相同。
负载250的阻抗可选地在中央控制器204的控制下进行调节(步骤510)。通常,如果负载250是逆变器,控制器204通过改变逆变器的控制参数来调节负载250的输入阻抗。根据欧姆定律,负载250的输入阻抗的改变导致负载250两端的输入电压改变。由于调节了负载250的输入阻抗,因而负载250两端的在电路501a中示出的电压(VT)改变了量ΔV。负载250两端的电压现在是VT+ΔV,并且负载250的电流(IL)现在是I2。
作为对在步骤510中执行的调节后的负载250的输入阻抗再次执行方法503(在图5c中示出)的结果,现在产生第二差分功率结果522。第二差分功率结果522通过公式4数学表示。
VT+ΔV I2=∑PIN-VA[I2]I2∑ViI2 式4
其中
VA[I2]=作为电流I2的函数的电弧电压。
(VT+ΔV)I2=传递到负载250的功率
ΣPIN=当模块202运行以便模块的输出电压(Vi)变化以使得在模块202的输出侧的功率与在模块202的输入侧的功率(PIN)相同时,模块202的功率输出,以及
ΣVi IL=具有固定的电压输出(Vi)的模块202的功率输出和/或当串520的电流充分地降低以便模块202的输出电压(Vi)增加到最大输出电压水平值时,模块202(具有变化的输出电压Vi)的功率输出。在所有情况下,最大输出电压水平值(Vi)和固定的电压输出(Vi)被预先配置成在发电电路501a内相同。
优选地使用控制器204从第二差分功率结果522中减去第一差分功率结果508来产生差从而将第一差分功率结果508与第二差分功率结果522进行比较(步骤524)。该差通过公式5表示,其作为从公式4减去公式3的结果。
VTI1-VT+ΔV I2=VA[I2]I2-VA[I1]I1∑ViI1-I2 式5
如此消除了电路501a的每一个模块202的总的输出功率(PIN)。通过执行针对公式5的模运算符函数(modulo operator function)由控制器204重新整理公式5来获得在公式6中示出的电弧系数α。
其中电弧系数α在式7中示出
在公式7中示出的电弧系数α的非零值导致需要设置报警条件(步骤528),否则产生另一个第一差分功率结果508(步骤503)。串联电弧的情况通常导致“保持有效”信号被控制器204去除,导致模块202关闭。模块202关闭是停止在串520内的串联电弧的优选的方式。
本文使用的不定冠词“一(a)”、“一(an)”,例如“一电弧电压和/或电弧电流”、“一负载”具有“一个或多个”的意思,即“一个或多个电弧电压和/或电弧电流”或者“一个或多个负载”。
尽管已经参考有限数量的实施方式对本发明进行了说明,应当理解可以实现本发明的许多变化、修改以及其他应用。
Claims (10)
1.一种用于在包括被配置为经由DC输电线连接到负载的光伏板的系统中进行电弧检测的方法,所述方法包括:
确定所述负载的噪声电压,因而产生第一测量结果;
确定所述光伏板的噪声电压,因而产生第二测量结果;
比较所述第一测量结果与所述第二测量结果,因而产生差分噪声电压结果;以及
响应于所述差分噪声电压结果大于阈值,设置指示所述系统中的潜在电弧的报警条件。
2.如权利要求1所述的方法,还包括将所述光伏板连接在光伏串中。
3.如权利要求2所述的方法,还包括:
响应于被设置的所述报警条件,断开所述光伏串。
4.如权利要求1所述的方法,还包括通过所述DC输电线经由被调制的传输来传输所述第二测量结果。
5.如权利要求1所述的方法,其中所述负载的噪声电压包括均方根(RMS)电压。
6.如权利要求1所述的方法,其中所述光伏板的噪声电压包括均方根(RMS)电压。
7.如权利要求1所述的方法,其中所述负载的噪声电压是由中央控制器测量的。
8.如权利要求1所述的方法,其中比较所述第一测量结果与所述第二测量结果包括计算所述第一测量结果与所述第二测量结果之间的差。
9.如权利要求1所述的方法,所述阈值是基于一天中的时间、一周中的一天或一年中的时间。
10.如权利要求1所述的方法,其中确定所述光伏板的噪声电压包括通过控制器从与所述光伏板相关联的电子模块接收与所述光伏板的噪声电压相关联的信号,以及其中所述方法还包括通过所述控制器基于所接收的信号来计算所述第二测量结果。
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US20170207746A1 (en) | 2017-07-20 |
US20120112760A1 (en) | 2012-05-10 |
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CN102565635A (zh) | 2012-07-11 |
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US20220263462A1 (en) | 2022-08-18 |
GB2485527A (en) | 2012-05-23 |
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CN102565635B (zh) | 2016-06-29 |
US11349432B2 (en) | 2022-05-31 |
CN106093721B (zh) | 2020-01-07 |
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