连续式加热炉是个典型具有大惯性、纯滞后、多变量、时变并且相互耦合的复杂被控对象，而且有许多不确定因素。

A continuous reheating industrial furnace is large inertia, pure delay, multi-variables, time-varying, intercoupling complicated controlled plant, and has many uncertain factors.

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利用MATLAB仿真软件建立了典型的配电网模型、直接并网及逆变并网两类分布式电源模型。详细阐述距离保护的保护原理和整定原则。

Distribution systems model and DG model are built in MATLAB. The theory and setting principle of distance protection are introduced in detail.

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