Centralized voltage regulation of power distribution system with distributed generation

本计画旨在设计一种集中式电压调整控制器，以解决配电系统中分布式电源（DG）并网所造成的电压升高问题。目前，安大略致力于到2018年将风能、太阳能、生物能等可再生能源发电量提高到10,700兆瓦。相应地，Hydro One已将超过1，800 MW基于可再生能源的DG连接到其配电系统。然而，高渗透率的DG在配电系统的水平可能会导致电压调节问题，公用事业由于反向功率流的配电馈线。因此，DG连接的容量将受到公用事业定义的电压调节约束的限制。Hydro One一直收到负载客户关于过电压和电压波动的投诉，这些投诉可以追溯到 一些已经在运作的危险品项目。为了在未来几年内安装更多容量的DG，Hydro One迫切需要有效的电压调节方法。 本项目将研究Hydro One配电系统的电压上升问题，并验证无功功率控制技术在DG渗透率高的有源配电网（ADN）电压调节中的有效性。如果成功，该项目将开发一种集中式电压调节控制器，它可以1）有效地调节ADN的电压，2）应用于Hydro One配电系统。集中控制器将协调变电站有载分接开关Transformer（OLTC）分接控制和DG无功功率控制，以在各种负载和发电水平下维持正常的馈线电压，从而为电力客户提供最佳的电压调节。在电压调节过程中，集中控制器还将考虑DG跳闸后的事故后情况，以确保 具有操作极限的事故后电压。

The proposed project aims to design a centralized voltage regulation controller to solve the voltage rise issued caused by the interconnection of distribution generation (DG) in power distribution systems. Currently, Ontario is committed to bring online 10,700 MW of renewable energy generation from wind, solar, bio-energy by 2018. Correspondingly, Hydro One has enabled more than 1,800 MW renewable energy source-based DG connected to its distribution system. However, high penetration of DG at the distribution system level may cause voltage regulation problem for utilities due to reverse power flow on distribution feeders. As a result, the capacity of DG connection will be limited by the voltage regulation constraints defined by the utilities. Hydro One had been receiving load customer complaints of overvoltage and voltage fluctuation that could be traced back to some DG projects that had already been in operation. Effective voltage regulation approaches are emergent for Hydro One to install more capacity of DG in the next few years. This project will investigate the voltage rise problem for the Hydro One distribution system and verify the effectiveness of reactive power control technique for voltage regulation of active distribution network (ADN) with high penetration of DG. If successful, the project will develop a centralized voltage regulation controller which can 1) effectively regulate the voltage of ADN, and 2) be applied to the Hydro One distribution system. The centralized controller will coordinate the substation on-load tap-changing transformer (OLTC) tap control and the DG reactive power control to maintain the normal feeder voltage under various load and generation levels to provide optimal voltage regulation to electricity customers. During the process of voltage regulation, the centralized controller will also consider the post-contingency situation after DG trip to ensure post-contingency voltage with operating limits.