State regulation of coal production, the closure of some of the poor conditions of small coal mines, coal supply will cause a decrease in the market, thus delaying coal prices downward speed.

国家加强对煤炭生产的调控，关闭部分条件差的小煤窑，也会造成市面上煤炭供给量的减少，从而延缓煤价下调速度。

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So it not only achieves the real-time feedback and the regulation of speed but also eliminate the static error of speed due to the integral action of PI regulator when the system is in a steady state.

这样不仅可以做到速度的实时反馈和调整，而且由于PI调节器的积分作用，可以使系统在稳态时做到速度无静差。

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