一种直接功率控制与串联补偿的超高压输电线路
A Direct Power Controlled and Series Compensated EHV Transmission Line
AI总结：
本文设计了一种用于345kV 480MVA三相输电线路的补偿方法，通过直接解耦功率控制实现精确的功率控制与稳定，提升线路负载能力及有功和无功功率调节能力。
摘要：
本文提出了用于345kV 480MVA三相输电线路的补偿方法设计与分析。补偿系统包含一个注入电压源的串联装置，以最小化电容器线路电抗的共振效应。这使得能够补偿次同步共振的影响，从而提高线路负载能力并控制有功和无功功率流动。通过直接解耦功率控制（DPC）方法实现了功率流动的粒度控制和同时稳定。设计过程详细考虑了线路参数变化、实际变压器阻抗和最大坡度响应率。线路效应在MATLAB的PLECS模型中得到演示，补偿控制系统功能得到验证。提供了一个从PSCAD的EMTP仿真中获得的345kV输电线路案例研究，考虑了实际超高压输电线路中遇到的分布参数效应。这展示了对电力系统暂态的稳定性改进以及对电力系统振荡的阻尼效果。
英文摘要：
This paper presents the design and analysis of a compensation method with application to a 345 kV 480 MVA three-phase transmission line. The compensator system includes a series injected voltage source converter that minimizes the resonance effects of capacitor line reactance. This creates an ability to compensate for the effects of subsynchronous resonance and thereby increase line loadability and control real and reactive power flows. The granularity of power flow control and simultaneous stabilization is achieved by the method of direct decoupled power control (DPC). The design process is detailed with respect to optimal response characteristics considering variations of line parameters, realistic transformer impedances, and maximum ramp response rates. Line effects are demonstrated in a PLECS model in MATLAB, and compensation control system functionality is verified. A case study is provided of a 345 kV transmission line from an EMTP simulation in PSCAD that accounts for distributed parameter effects that are encountered in physical EHV transmission lines. This demonstrates the improvement in stability to power system transients as well as damping of power system oscillations.
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