保护用数据同步系统失效场景下线路主保护应急方案研究

发布时间：2018-09-13 09:26

【摘要】：随着变电站的数字化和智能化,电量信息由点对点的模拟量传输逐步转变为网络化的数字量传输,因此数字信息的同步变得尤为重要。保护用数据同步系统失效后,不仅线路两侧的电气量无法准确比相,即使完全依赖本侧信息的测量量,如距离/方向信息,因其依赖电压电流之间进行比相,也会输出错误结果。在此场景下,只能依赖电流速断和其他站的远后备保护实现对管辖区域内故障的保护,保护范围和动作速度都将显著变差。针对这一问题,基于拥有抗高阻故障能力且无需两侧信息同步的和阻抗继电器原理,提出无需相位信息的和阻抗模量保护判据和中段保护判据,结合电流速断保护,通过纵联通道的模量信息交互,形成保护用数据同步系统失效场景下的线路主保护应急方案,显著改善上述场景下的线路主保护性能。仿真算例验证所提方法的有效性和优越性。
[Abstract]:With the digitalization and intelligentization of substation, the information of electric quantity is gradually changed from point-to-point analog transmission to networked digital transmission, so the synchronization of digital information becomes more and more important. After the failure of the data synchronization system for protection, not only the electrical quantities on both sides of the line cannot be accurately compared, but even the measurements which depend entirely on the information of the local side, such as distance / direction information, depend on the phase comparison between voltage and current. Error results are also output. In this scenario, the fault protection within the jurisdiction area can only be realized by relying on the current quick break and the remote backup protection of other stations, and the protection range and the operation speed will become significantly worse. In order to solve this problem, based on the principle of sum impedance relay, which has the ability to resist high resistance fault and does not need to synchronize the information of both sides, the criterion of sum impedance modulus protection without phase information and the criterion of middle section protection are proposed, and combined with the protection of current quick break. Through the exchange of moduli information of the longitudinal connection channel, the emergency scheme of line main protection under the failure scenario of data synchronization system for protection is formed, and the performance of line main protection under the above scenario is improved significantly. A simulation example is given to verify the effectiveness and superiority of the proposed method.
【作者单位】：强电磁工程与新技术国家重点实验室(华中科技大学);广东电网有限责任公司梅州供电局;国网冀北电力有限公司管理培训中心;南瑞集团公司(国网电力科学研究院);
【基金】：国家自然科学基金项目(51577077,51477090) 国网湖北省电力公司科技项目(SGTYHT/15-JS-191)~~
【分类号】：TM77

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