Smart Distribution Grid Power Quality Control using DG-Grid Interfacing Power Converters

对能源成本、能源安全和温室气体排放的担忧日益增加，促使电力行业通过分布式发电（DG）将更多的可再生能源（RESs）整合到配电系统中。智能或灵活的配电网是一个新概念，可以实现电力行业基础设施的转变，提高可靠性和电力质量。与此同时，随着越来越多的非线性负荷接入系统，北美地区配电网电压畸变也在迅速增加。电能质量差会影响敏感负载，甚至干扰电信系统。智能配电网对电能质量的改善立竿见影。考虑到基于RES的DG系统通过电网接口电源转换器连接到配电网，这一点尤其正确。这些电网接口转换器将RES输出电压转换为电网友好电压，用于系统集成。然而，可再生能源的间歇性导致这些转换器通常在低于额定功率的情况下运行。一个很有前途的概念是利用这些DG-grid接口电源转换器的可用额定值来改善配电网的电能质量。

Increasing concerns about energy costs, energy security, and greenhouse gas emissions, are motivating the power industry to integrate more renewable energy sources (RESs) into the power distribution system through distributed generation (DG). The smart or flexible distribution grid is a new concept that could enable this infrastructural shift in the power industry with improved reliability and power quality. In parallel with this, the distribution grid voltage distortion in North America is increasing rapidly as more nonlinear loads are connected to the system. Poor power quality affects sensitive loads and even interferes with telecommunication systems. The smart distribution grid can provide immediate improvement to power quality. This is especially true considering that RES based DG systems are connected to the distribution grid through grid-interfacing power converters. These grid-interfacing converters convert the RES output voltage to the grid-friendly voltage for system integration. However, the intermittent nature of renewable energy causes these converters to usually operate at lower than rated power. A promising concept is to use the available ratings from these DG-grid interfacing power converters to improve the power quality of the distribution grid.