The invention discloses a
harmonic suppression method suitable for wide-range
power grid intensity, which comprises the following steps of: in a control link of a power electronic converter, adding extraction of
harmonic current and
harmonic voltage, controlling the harmonic current through a harmonic current controller, and adjusting an output
signal of the harmonic current controller by using a cross
coupling modulation method, so as to realize harmonic suppression of the wide-range
power grid intensity. Parameters of the harmonic current controller can be flexibly adjusted, when complete harmonic current suppression is adopted, the parameters designed in advance are adopted, and when harmonic
voltage exceeds a harmonic
voltage threshold value, the harmonic voltage is adjusted through the harmonic
voltage amplitude controller. According to the method, the problem of dynamic adjustment
ringing of a traditional method when the
power grid intensity of the distorted power grid changes in a wide range, especially under the weak power grid working condition is solved, the harmonic voltage and the harmonic current under the weak power grid can be flexibly adjusted, and the harmonic voltage characteristic is optimized. According to the method, additional circuits are not needed, and multi-target
harmonic control of the grid-connected converter under the working condition of wide-range power grid intensity can be realized.