引风机是火力发电厂重要的辅助设备，传统的引风机系统采用通过调节挡板开度的方式调节风量，这种调节方式耗电量较大，以高压变频器为核心的变频调速系统以其效率高、应用范围广和节能效果显著的特点在节能改造方面得到了广泛的应用。(With the deepening of the power system, power generation companies competition
is　increasingly　fierce,　and　effectively　reduce　the　cost　of　power　generation,　to　improve the　safe　operation　of　the　coefficient　of　the　generating　units　and　to　improve　economic efficiency has become the main objectives pursued by the power generation companies.)