CN103098364B - 用于调节可控蓄能器的供电支路的期望输出电压的方法 - Google Patents
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
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- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/501—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode sinusoidal output voltages being obtained by the combination of several pulse-voltages having different amplitude and width
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/40—The network being an on-board power network, i.e. within a vehicle
- H02J2310/48—The network being an on-board power network, i.e. within a vehicle for electric vehicles [EV] or hybrid vehicles [HEV]
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- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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Abstract
本发明涉及一种用于调节可控蓄能器(2)的供电支路(3-3)的期望输出电压U_Soll的方法,该可控蓄能器(2)用于n相电机(1)的控制和电能供给,其中n≥1。在此,该可控蓄能器(2)具有n个并行的供电支路(3-1,3-2,3-3),所述供电支路(3-1,3-2,3-3)分别具有至少两个串联的蓄能器模块(4),所述蓄能器模块(4)分别包含具有关联的可控耦合单元(6)的至少一个电蓄能器单元(5),所述供电支路(3-1,3-2,3-3)一方面与基准母线(T-)相连接,而另一方面分别与该电机(1)的一个相(U,V,W)相连接。至少一个耦合单元(6-3m)脉冲状地被触发来使得供电支路(3-3)的输出电压的算术平均值对应于该期望输出电压U_Soll,其中与所述至少一个耦合单元(6-3m)分别关联的蓄能器单元(5-3m)在脉冲持续期间被接通到相应的供电支路(3-3)中,并在间歇持续时间期间被跨接。
Description
技术领域
本发明涉及一种用于调节可控蓄能器的供电支路的期望输出电压的方法。
背景技术
呈现的是,将来不仅在静止应用中、诸如在风力设备中,而且在车辆中、如混合动力车辆或电动车辆中,电子***越来越多地被采用,其中这些电子***把新的蓄能技术与电驱动技术相组合。在常规的应用中,例如被实施为感应式电机的电机通过逆变器形式的变频器而被控制。这样的***的特征是一种所谓的直流电压中间回路(Gleichspannungszwischenkreis),蓄能器(通常是电池)通过该直流电压中间回路被连接到该逆变器的直流电压侧。为了能够满足针对相应应用而给出的对功率和能量的要求,多个电池单元被串联。因为由这样的蓄能器所提供的电流必须流过所有的电池单元,并且一个电池单元仅能够传导有限的电流,所以常常并联额外的电池单元,以便提高最大电流。
多个电池单元的串联电路除了高的总电压之外还带来以下的问题,即如果仅有一个电池单元故障,因为不再有电池电流可以流动,那么整个蓄能器故障。蓄能器的这种故障可能导致整个***的故障。在车辆中,驱动电池的故障可能导致车辆的“停驶”。在其他的应用中,诸如在风力设备的转子叶片调整(Rotorblattverstellung)中,在基本条件(Rahmenbedingung)不利的情况下,诸如在强风的情况下,甚至可能发生危及安全的状况。因而,总是力求蓄能器的高可靠性,其中***的在预给定的时间内无错误地工作的能力被称为“可靠性”。
在较早的申请DE102010027857和DE102010027861中描述了具有多个电池模块串(Batteriemodulstrang)的电池,其可以直接被连接到电机上。所述电池模块串在此具有多个串联的电池模块,其中每个电池模块都具有至少一个电池单元和关联的可控耦合单元,所述关联的可控耦合单元允许根据控制信号来中断相应的电池模块串,或者跨接分别关联的至少一个电池单元,或者把分别关联的至少一个电池单元接通到相应的电池模块串中。通过所述耦合单元的适当触发(Ansteuerung),例如借助脉宽调制来触发,也可以提供合适的相位信号来控制该电机,使得可以省去单独的脉冲逆变器。为了控制该电机所需的脉冲逆变器由此在某种程度上可以说被集成到电池中。出于公开的目的,这两个较早的申请全面地被包括在本申请中。
发明内容
本发明的公开
本发明提出了一种用于调节可控蓄能器的供电支路的期望输出电压的方法,该可控蓄能器用于n相电机的控制和电能供给,其中n≥1。在此,该可控蓄能器具有n个并行的供电支路,所述供电支路分别具有至少两个串联的蓄能器模块,所述蓄能器模块分别包含有具有关联的可控耦合单元的至少一个蓄能器单元。所述供电支路一方面可以与基准电势(在下文被称作基准母线(Bezugsscheine))相连接,而另一方面可以分别与该电机的一个相连接。根据控制信号,耦合单元或者跨接分别关联的蓄能器单元,或者这些耦合单元把分别关联的蓄能器单元接通到相应的供电支路中。至少一个耦合单元脉冲状地被触发为使得供电支路的输出电压的算术平均值对应于期望输出电压,其中与至少一个耦合单元分别关联的蓄能器单元在脉冲持续时间期间被接通到相应的供电支路中,并在间歇持续时间(Pausendauer)期间被跨接。
本发明的优点
这样的可控蓄能器的供电支路的总输出电压通过耦合单元的可控开关元件的相应开关状态被确定,并能够分级地(stufig)被调节。这种分级在此根据各个蓄能器模块的电压来得到。如果从同样构造的蓄能器模块的优选实施形式出发,那么由单个蓄能器模块的电压乘每个供电支路的串联蓄能器模块的数目m就得到了最大可能的总输出电压。如果利用这样的可控蓄能器来触发电机,那么尤其是在小输出电压的情况下由于输出电压的分级而可发生电机的转矩波动。
本发明所基于的基本思想是,对至少一个耦合单元进行脉冲状触发,其中与至少一个耦合单元分别关联的蓄能器单元在脉冲持续时间期间被接通到相应的供电支路中,并在间歇持续时间期间被跨接。通过合适地选择占空率,可以以这种方式调节该供电支路的输出电压的算术平均值,使得该供电支路的输出电压的算术平均值对应于期望输出电压。该供电支路的输出电压由此能无级地被调节。在这样运行的可控蓄能器上所连接的电机是电感性负载。通过该电感性负载出现的电流对应于如通过直接施加具有该算术平均值的值的电压会出现的电流。以这种方式避免了不期望的转矩偏差。
根据本发明的优选实施形式,供电支路的位于通过把蓄能器单元持续接通在该供电支路中或跨接该蓄能器单元而可达到的两个输出电压值U1和U2之间的期望输出电压U_Soll通过如下方式被调节:控制导致该输出电压值U1的蓄能器模块的耦合单元,使得相应的蓄能器单元持续地被接通到该供电支路中,并且在持续接入到该供电支路中时会把输出电压值从U1提高到U2的蓄能器单元所关联的耦合单元脉冲状地以为
的占空率T而被触发。该占空率在此说明了脉冲持续时间(接通时间)与脉冲周期持续时间之比,其中该周期持续时间作为该脉冲持续时间与该间隙持续时间(断开时间)之和而被得到。
这种控制具有的优点是,供电支路的本身只可分级调节的期望输出电压的中间值可以通过对唯一的耦合单元的脉冲状触发而被调节。但是应指出的是,该期望输出电压也可以通过对多个耦合单元的脉冲状触发而被调节。仅如下情况是决定性的:持续地或暂时地被接通到相应供电支路中的所有蓄能器单元的算术电压平均值对应于所希望的期望输出电压。
附图说明
本发明的实施形式的其他特征和优点由随后参考附图的描述得到。
其中:
图1示出了具有可控供电装置的电机的示意图;
图2示出了供电支路的可调节输出电压在没有脉冲状触发的情况下的图形表示;以及
图3示出了供电支路的可调节输出电压在具有脉冲状触发的情况下的图形表示。
具体实施方式
在三相电机1上连接有可控蓄能器2(图1)。该可控蓄能器2包含有三个供电支路3-1、3-2和3-3,所述供电支路3-1、3-2和3-3一方面与基准电势T-(基准母线)相连接,该基准电势T-在所示的实施形式中引导低电势,并且所述供电支路3-1、3-2和3-3另一方面分别与该电机1的各个相U、V、W相连接。供电支路3-1、3-2和3-3中的每个都具有m个串联的蓄能器模块4-11至4-1m或4-21至4-2m或4-31至4-3m,其中m≥2。蓄能器模块4又分别包含有多个串联的电蓄能器单元,为了清楚起见,所述电蓄能器单元仅在与该电机1的相W相连接的供电支路3-3中配备有参考符号5-31至5-3m。蓄能器模块4此外还分别包含有耦合单元,该耦合单元与相应的蓄能器模块4的蓄能器单元5关联。为了清楚起见,耦合单元仅在供电支路3-3中也被配备有参考符号6-31至6-3m。在所示出的实施变型方案中,耦合单元6分别通过两个可控开关元件7-311和7-322至7-3m1和7-3m2来构成。这些开关元件在此可以被实施为功率半导体开关、例如IGBT(绝缘栅双极晶体管(InsulatedGateBipolarTransistor))形式的功率半导体开关,或者被实施为MOSFET(金属氧化物半导体场效应晶体管(MetalOxideSemiconductorField-EffectTransistor))。
耦合单元6能够通过断开耦合单元6的两个开关元件7来中断相应的供电支路3。可替换地,蓄能器单元5可以通过分别闭合耦合单元6的开关元件7之一要么被跨接,例如闭合该开关7-311被跨接,要么被接通到相应的供电支路3中,例如闭合开关7-312而被接通到相应的供电支路3中。
耦合单元6由此允许把电机1的相U、V、W或者相对于高基准电势、或者相对于低基准电势而被接通,并就这点而言也能够满足公知的逆变器的功能。由此,该电机1的功率和运行方式在适当触发耦合单元6的情况下能够通过可控蓄能器2而被控制。该可控蓄能器2因此就这点而言满足了双重功能,因为该可控蓄能器2一方面用于电能供给,但另一方面也用于控制该电机1。
在所示的实施例中,该电机1被实施为三相感应式电机,但也可以具有少于或多于三个的相。当然,在可控蓄能器2中的供电支路3的数目也取决于电机的相数。
在所示的实施例中,每个蓄能器模块4都分别具有多个串联的蓄能器单元5。但是,蓄能器模块4可替换地也可以分别具有仅唯一的蓄能器单元或者也具有并联的蓄能器单元。
在所示的实施例中,耦合单元6分别由两个可控开关元件7来构成。但是,耦合单元6也可以通过更多或更少的可控开关元件来实现,只要可实现必要的功能(跨接蓄能器单元以及把蓄能器单元接通到该供电支路中)。耦合单元的示例性的可替换的扩展方案由较早的申请DEXX和DEYY得到。但此外也可设想的是,耦合单元具有全桥连接的开关元件,这在该蓄能器模块的输出上提供电压反转的附加可能性。
供电支路3-1至3-3的总输出电压通过耦合单元6的可控开关元件7的相应开关状态被确定,并能够分级地被调节。该分级在此根据各个蓄能器模块4的电压来得到。如果从同样构造的蓄能器模块4的优选实施形式出发,那么由单个蓄能器模块4的电压乘每个供电支路的串联蓄能器模块4的数目m得到了最大可能的总输出电压U_输出。在图2中示意性示出了供电支路的这样的可分级调节的输出电压。
下面示例性地描述单个供电支路3、也即供电支路3-3的期望输出电压的调节。在此应假定,该供电支路3-3的第一蓄能器模块4-31的蓄能器单元5-31在持续接通到该供电支路3-3中时提供输出电压U1,并且供电支路3-3的第m个蓄能器模块4-3m的蓄能器单元5-3m在持续接通到该供电支路3-3中时提供输出电压Um,其中Um=U2-U1,使得持续接入两个蓄能器模块4-31和4-3m的蓄能器单元得到输出电压U2。此外还假定,应该调节在该电压值U1和U2之间的期望输出电压U_Soll。
该期望输出电压U_Soll现在根据本发明通过如下方式被调节:与蓄能器单元5-31关联的耦合单元6-31通过未示出的控制单元被触发,使得蓄能器单元5-31被持续接通到该供电支路3-3中。这具体地通过如下方式来实现:开关元件7-312被持续地闭合,而开关元件7-311被持续地断开。以这种方式,提供期望输出电压U_Soll的具有电压值U1的第一部分。耦合单元6-3m通过未示出的控制单元以为
的占空比而脉冲状地被触发。具体来说,在脉冲持续时间期间,该开关元件7-3m2被闭合,而开关元件7-3m1被断开,并在间歇持续时间期间,该开关元件7-3m2被断开,而开关元件7-3m1被闭合。以这种方式提供该期望输出电压U_Soll的第二部分。在该供电支路3-3中的所有其余蓄能器单元5-32至5-3(m-1)为了调节期望输出电压U_Soll而不被需要。相关的耦合单元6-32至6-3(m-1)因而被控制来使得关联的蓄能器单元5-32至5-3(m-1)被持续地跨接。由此,针对供电支路3-3得到了输出电压的算术平均值ū为
。
连接到这样运行的可控蓄能器2上的电机1是电感性负载,其中通过该电感性负载出现的电流对应于如通过直接施加具有算术平均值的值的电压会出现的电流。根据本发明的方法因此实现了供电支路3-1至3-3的输出电压的无级调节。
图3示意性示出了在供电支路3上的借助根据本发明的方法可调节的输出电压。可无级调节的输出电压在此用参考符号30来表征。该脉冲状触发信号的原理图通过参考符号31来表征。与图2中的图示类似地,即使在附图中的图示的情况下也从同样构造的蓄能器模块4的优选实施形式出发。但是,针对本发明的可应用性,这并不是所需的。
除了通过耦合单元6的具体描述的触发形式之外,该期望输出电压U_Soll也可以通过可替换的触发形式来调节。这样,该期望输出电压U_Soll的具有电压值U1的第一部分显然也可以通过不同于蓄能器模块4-31的蓄能器模块来提供。前提仅仅是,相对应的蓄能器模块4的蓄能器单元5正恰好能够提供该电压U1。同样,也可以脉冲状地触发不同于耦合单元6-3m的耦合单元。在此仅仅要注意的是,相对应地匹配该占空率。也可设想的是,不仅脉冲状地触发耦合单元6,而且以合适的占空率来触发多个耦合单元6。决定性的总是仅仅是:得到所有持续地或暂时地被接通到该供电支路3中的蓄能器单元5的算术电压平均值,该算术电压平均值对应于所希望的期望输出电压U_Soll。
Claims (1)
1.用于调节可控蓄能器(2)的供电支路(3-3)的期望输出电压U_Soll的方法,该可控蓄能器(2)用于n相电机(1)的控制和电能供给,其中n≥1,其中,
-可控蓄能器(2)具有n个并行的供电支路(3-1,3-2,3-3),所述供电支路(3-1,3-2,3-3)
·分别具有至少两个串联的蓄能器模块(4),所述蓄能器模块(4)分别包含具有关联的可控耦合单元(6)的至少一个电蓄能器单元(5),
·一方面能与基准母线(T-)相连接,以及
·另一方面能分别与电机(1)的一个相(U,V,W)相连接,
-耦合单元(6)根据控制信号来跨接分别关联的蓄能器单元(5),或者把分别关联的蓄能器单元(5)接通到相应的供电支路(3-1;3-2;3-3)中,
其中,至少一个耦合单元(6-3m)脉冲状地被触发来使得供电支路(3-3)的输出电压的算术平均值对应于期望输出电压U_Soll,其中分别与所述至少一个耦合单元(6-3m)关联的蓄能器单元(5-3m)在脉冲持续时间期间被接通到相应的供电支路(3-3)中并在间歇持续时间期间被跨接,
其特征在于,供电支路(3-3)的期望输出电压U_Soll通过如下方式被调节,其中该期望输出电压U_Soll位于通过持续地把蓄能器单元(5)接通到供电支路(3-3)中或跨接蓄能器单元(5)所能达到的两个输出电压值U1和U2之间,其中输出电压值U1是供电支路(3-3)的单个蓄能器模块的所有蓄能器单元(5)在接通到供电支路(3-3)中时提供的输出电压值,而输出电压值U2是供电支路(3-3)的所有蓄能器模块的所有蓄能器单元(5)在接通到供电支路(3-3)中时提供的输出电压值:
-蓄能器模块(4-11)的导致单个蓄能器模块的输出电压值U1的耦合单元(6-11)被控制,使得相应的蓄能器单元(5-11)持续地被接通到该供电支路(3-3)中,以及
-与在持续接入到供电支路(3-3)中会把输出电压值从U1提高到U2的蓄能器单元(5-3m)关联的耦合单元(6-3m)脉冲状地以如下占空率T而被触发
。
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DE102014200205A1 (de) * | 2014-01-09 | 2015-07-09 | Robert Bosch Gmbh | Verfahren zur Bereitstellung einer elektrischen Spannung und Batterie |
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DE102018200540A1 (de) * | 2018-01-15 | 2019-07-18 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Kraftfahrzeugbordnetzes |
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