The stand-alone solar photovoltaic water pumping system (SPVWPS) remains idle for a significant period of time, when irrigation is not required and when sun is not available. Due to this large idle period, the effective utilisation of SPVWPS assets, i.e. solar photovoltaic array, power electronics converter, and motor, is poor. This study presents an approach to increase the effective utilisation of SPVWPS under the aforementioned idle period. It is proposed to interface the grid with SPVWPS without adding extra power electronic interface. An innovative integrated photovoltaic inverter is constructed using existing SPVWPS components. The inverter enables the transfer of active power and exchange of reactive power with the grid during an idle period of SPVWPS. The three legs of the voltage source inverter (VSI) are interleaved with motor windings. The VSI switches are controlled with synchronous pulse width modulation to force a cophasal current in the motor windings. This accompanies a net motor torque to zero under grid-interactive operation. Hence, the three-phase VSI operates as a single-phase grid synchronise converter, and the motor windings are used as filter inductance. The control system is presented to establish grid-interactive functionality. A prototype is developed to verify system performance. The control system is implemented using the ARM Cortex-M4 microcontroller.

中文翻译：

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利用感应电动机驱动的光伏水泵系统开发并网逆变器

当不需要灌溉和没有太阳时，独立的太阳能光伏水泵系统（SPVWPS）保持空闲状态很长一段时间。由于闲置时间长，SPVWPS资产（即太阳能光伏阵列，电力电子转换器和电动机）的有效利用率很差。这项研究提出了一种在上述空闲时间段内提高SPVWPS的有效利用率的方法。建议在不增加额外功率电子接口的情况下将电网与SPVWPS接口。利用现有的SPVWPS组件构建了创新的集成光伏逆变器。逆变器可在SPVWPS的空闲时间段内与电网实现有功功率的传输和无功功率的交换。电压源逆变器（VSI）的三个支路与电动机绕组交错。VSI开关由同步脉冲宽度调制控制，以在电动机绕组中施加同相电流。在电网互动运行中，这将使净电动机转矩降至零。因此，三相VSI用作单相电网同步转换器，并且电动机绕组用作滤波电感。提出了控制系统以建立电网交互功能。开发了一个原型来验证系统性能。该控制系统使用ARM Cortex-M4微控制器实现。电机绕组用作滤波电感。提出了控制系统以建立电网交互功能。开发了一个原型来验证系统性能。该控制系统使用ARM Cortex-M4微控制器实现。电机绕组用作滤波电感。提出了控制系统以建立电网交互功能。开发了一个原型来验证系统性能。该控制系统使用ARM Cortex-M4微控制器实现。