Photovoltaic inverter comprising an upstream DC/DC converter and temperature regulation of the power semiconductors

具有前置dc/dc转换器和功率半导体温度调节的光伏逆变器

Abstract

In a method for operating an inverter (12) in which an input voltage (UPV) of the inverter (12) is set by an input-side DC-to-DC converter (14) and/or an output-side inverter bridge (16), wherein the input voltage (UPV) corresponds to an MPP voltage (UMpp) at which a generator (11) connectable on the input side emits a maximum electric power, a first temperature value (TDCDC) in the DC-to-DC converter (14) is determined and a second temperature value (TDCAC) in the inverter bridge (16) is determined and the input voltage (UPV) of the inverter (12) is changed with respect to the MPP voltage (UMpp) if at least one of the determined temperature values (TDCDC, TDCAC) exceeds a limit value (Tmax,DCDC, Tmax DCAC) assigned thereto. In the method, the input voltage (UPV) is increased with respect to the MPP voltage (UMpp) if it is determined that the limit value (Tmax DCDC) for the first temperature value (TDCDC) in the DC-to-DC converter (14) has been exceeded or if it is determined that the limit value for the second temperature value (TDCAC) has been exceeded and the MPP voltage (UMpp) is below a preset limit voltage (Ulimit). Otherwise, the input voltage (UPV) is reduced with respect to the MPP voltage (UMpp). An inverter (12) for an energy generation plant (10) comprises an input-side DC-to-DC converter (14), an output-side inverter bridge (16), a control device (17) for driving the DC-to-DC converter (14) and the inverter bridge (16) with control signals (18) and temperature sensors (19) assigned in each case to the DC-to-DC converter (14) and the inverter bridge (16). The control device (17) of the inverter (12) is designed to implement the above method.
在用于操作逆变器(12)的方法中通过输入侧的直流电压转换器(14)和/或输出侧的逆变桥(16)调节逆变器(12)的输入电压(UPV),其中输入电压(UPV)对应于MPP电压(UMPP),能够连接在输入侧的发电机(11)在MPP电压输出最大电功率,在该方法中确定直流电压转换器(14)中的第一温度值(TDCDC)和逆变桥(16)中的第二温度值(TDCAC),并且相对于MPP电压(UMPP)改变逆变器(12)的输入电压(UPV),前提是确定的温度值(TDCDC、TDCAC)中的至少一个超过分配给其的极限值(Tmax,DCDC、Tmax,DCAC)。在该方法中相对于MPP电压(UMPP)升高输入电压(UPV),条件是确定超过了直流电压转换器(14)中第一温度值(TDCDC)的极限值(Tmax,DCDC),或者确定超过了第二温度值(TDCAC)的极限值并且MPP电压(UMPP)低于预定的极限电压(U极限)。否则输入电压(UPV)相对于MPP电压(UMPP)降低。一种用于发电设备(10)的逆变器(12)具有输入侧的直流电压转换器(14)、输出侧的逆变桥(16)、用于以控制信号(18)控制直流电压转换器(14)和逆变桥(16)的控制装置(17)以及各自分配给直流电压转换器(14)和逆变桥(16)的温度传感器(19)。逆变器(12)的控制装置(17)被设置用于实施上述方法。

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