Centralized voltage regulation of power distribution system with distributed generation

本课题旨在设计一种集中式调压控制器，以解决配电系统中配电网并网引起的电压升高问题。目前，安大略省承诺到2018年实现10700兆瓦的风能、太阳能、生物能可再生能源发电上线。相应地，海德鲁一号已使1,800多兆瓦的可再生能源分布式发电接入其配电系统。然而，分布式电源在配电系统中的高渗透率可能会由于配电馈线上的反向潮流而给公用事业公司带来电压调节问题。因此，DG接线的容量将受到电力公司规定的电压调节约束的限制。海德鲁一号一直收到负荷客户对过电压和电压波动的投诉，这些投诉可以追溯到 一些已经投入运营的DG项目。为了在未来几年内增加分布式发电容量，水电一号机组迫切需要采取有效的调压措施。 本项目将研究水电一号配电系统的电压升高问题，验证无功控制技术在DG渗透率较高的有源配电网(ADN)电压调节中的有效性。如果成功，该项目将开发出一种集中式调压控制器，该控制器可以1)有效地调节ADN的电压，2)应用于水电一号配电系统。集中控制器将协调变电站有载调压变压器(OLTC)分接控制和DG无功控制，在不同负荷和发电水平下保持正常的馈线电压，为用户提供最佳的电压调节。在调压过程中，集中控制器还会考虑DG跳闸后的事故后情况，以确保 带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.