考虑不同渗透率条件的分布式逆变系统自适应并网差异化控制策略研究

Most distributed generation needs an inverter to achieve the docking with the network. It is representative of the formation high density and high permeability conditions of access. Under the conditions of different permeability, to adapt that distributed inverter system should have had differences with the control strategy. But there are still exist the problem when distributed generation grid-connected that single machine cannot adapt to the time-dependent problems of distribution network. And high-density access has poor power quality, coupled association complex, unable to locate the assessment, high permeability access inertia and track grid performance is weak and other issues. Around adaptive control challenges for the distributed source accessing to the distribution network, the projects study on distributed inverter system adaptive function design and performance evaluation method; study on high-density distributed inverter system Multivariate coupling mechanism and power quality interaction dissemination mechanism analysis; study on different penetration levels and different access density distributed inverter system adaptive control differentiation control strategy and empirical research; Solve the equipment design, identification of assessment, coupled interference mechanism and differentiated solution programs of key issues for the high-density distributed source accessing to distribution network.

大部分分布式电源需要逆变来实现与电网对接，其形成的高密度高渗透率接入的情况具备代表性。在不同渗透率条件下，分布式逆变系统应具备有差异的控制策略与之适应，但目前分布式电源并网仍存在单机无法适应配网的时变问题；高密度接入电能质量差、耦合关联复杂、无法定位评估；高渗透率接入惯性惯量及追踪电网性能较弱等问题。项目围绕分布式电源接入配电网的自适应控制难题，研究分布式逆变系统自适应功能设计及效能评估方法；研究高密度分布式逆变系统多元耦合机理及电能质量交互传播机理分析方法；研究考虑不同渗透率水平、研究不同接入密度的分布式逆变系统自适应控制差异化控制策略并进行实证研究。解决高密度分布式电源接入配电网的装备设计、辨识评估、耦合干扰机理、差异化解决方案等关键问题。

本项目立足于我国分布式发电迅速发展的现状，开展了高密度分布式逆变系统自适应控制关键技术研究，以分布式发电接入中最苛刻最复杂的高密度分布式逆变系统为研究对象，全面掌握了高密度分布式逆变系统电能质量发射特性及多元耦合对配网的影响机制，建立了多电能质量指标综合评估模型，研究分布式逆变系统主动服务电网功能和主动参与电网调整的功能级和装置级设计方案并评估其效能，依赖前期已进行研究的自适应接入、主动服务、可靠并联等系列技术，通过实证研究指导分布式逆变系统采取差异化的自适应控制策略与配网进行有益交互，增强了配网与分布式电源的联系。该项目分为3个课题，重点关注分布式逆变系统高密度接入条件下的装置和功能新设计体系、耦合机理和电能质量发射水平研究及对应的评估方法、分布式逆变系统大量接入配电网条件下的差异化解决方案及实证研究，研究内容涵盖了高密度分布式逆变系统中存在的亟需解决的几点共性问题，有助于配网实现对底层分布式电源的高级管理，实现高密度分布式逆变系统规范有序的接入配电网，增强配电网的可靠性和稳定性。