Model Integration and Control Interaction Analysis of AC/VSC HVDC System
Model Integration and Control Interaction Analysis of AC/VSC HVDC System
复制标题
交流/VSC高压直流输电系统模型集成与控制交互分析
DOI：
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发表时间：
2015
期刊：
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通讯作者：
Li Shen
中科院分区：
文献类型：
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作者：
Li Shen
基于电压源换流器（VSC）的高压直流输电技术近年来在世界范围内得到了迅速发展。英国输电系统正在经历能源格局的根本变化，这需要大量VSC HVDC装置来连接大型第三轮风电场并与其他国家互连。对于大功率远距离输电，VSC HVDC技术提供了灵活性和可控性的潮流，这可以有益于并加强传统的交流系统。然而，需要查明和解决相关的不确定性和潜在问题。为了进行这项研究，综合数学动态AC/DC系统模型，本文开发的小扰动稳定性分析。本研究的保真度进一步增加，通过开发一个动态等效代表英国（GB）的系统，这是一个循序渐进的过程，目的是提供一个路线图，把一个稳态的潮流模型变成一个动态equivalent.This论文的目的是填补一些空白的研究，关于将VSC HVDC技术集成到传统的AC systems。本研究的主要成果是一个系统的评估的影响VSC控制的稳定性连接的交流系统。分析主要围绕AC/DC系统的稳定性问题，以及VSC HVDC和AC系统组件之间的控制相互作用的一些方面进行。已查明的问题和相互作用主要可归纳为三个方面：（1）VSC HVDC控制对交流系统机电振荡的影响，（2）VSC HVDC和柔性交流输电系统（FACTS）之间的潜在控制交互;为了提高交流系统的稳定性，研究了电压源型直流输电（VSC）的有功功率支持能力，并采用参数化方法评估了VSC控制对交流系统动态特性的影响。灵敏度分析，以突出候选VSC HVDC外部控制方案之间的权衡。结合分析技术，包括相对增益阵列（RGA）和模态分析，然后应用到评估的相互作用？在工厂模型和外部控制器？静止同步补偿器（STATCOM）和在同一AC系统中操作的VSC HVDC链路之间的通信。最后，一个具体的案例研究是用来分析的能力，VSC HVDC提供有功功率支持连接的交流系统，通过建议的频率下垂有功功率控制策略。
The development of voltage source converter (VSC) based high voltage direct current (HVDC) transmission has progressed rapidly worldwide over the past few years. The UK transmission system is going through a radical change in the energy landscape which requires a number of VSC HVDC installations to connect large Round 3 windfarms and for interconnections to other countries. For bulk power long distance transmission, VSC HVDC technology offers flexibility and controllability in power flow, which can benefit and strengthen the conventional AC system. However, the associated uncertainties and potential problems need to be identified and addressed. To carry out this research, integrated mathematical dynamic AC/DC system models are developed in this thesis for small disturbance stability analysis. The fidelity of this research is further increased by developing a dynamic equivalent representative Great Britain (GB) like system, which is presented as a step-by-step procedure with the intention of providing a road map for turning a steady-state load flow model into a dynamic equivalent.This thesis aims at filling some of the gaps in research regarding the integration of VSC HVDC technology into conventional AC systems. The main outcome of this research is a systematic assessment of the effects of VSC controls on the stability of the connected AC system. The analysis is carried out for a number of aspects which mainly orbit around AC/DC system stability issues, as well as the control interactions between VSC HVDC and AC system components. The identified problems and interactions can mainly be summarized into three areas: (1) the effect of VSC HVDC controls on the AC system electromechanical oscillations, (2) the potential control interactions between VSC HVDC and flexible alternating current transmission systems (FACTS) and (3) the active power support capability of VSC HVDC for improving AC system stability.The effect of VSC controls on the AC system dynamics is assessed with a parametric sensitivity analysis to highlight the trade-offs between candidate VSC HVDC outer control schemes. A combination of analysis techniques including relative gain array (RGA) and modal analysis, is then applied to give an assessment of the interactions ? within the plant model and the outer controllers ? between a static synchronous compensator (STATCOM) and a VSC HVDC link operating in the same AC system. Finally, a specific case study is used to analyse the capability of VSC HVDC for providing active power support to the connected AC system through a proposed frequency droop active power control strategy.