New energy VSG frequency modulation direct current voltage control apparatus, method and optimization method

Abstract

The invention discloses a new energy VSG frequency modulation direct current voltage control apparatus, method and optimization method. The apparatus comprises a main circuit, a first phase-locked loop, a reference power calculation module, a direct current voltage optimization module, a first comparator, a first regulator, a transmitting end active / reactive power determination module, a second phase-locked loop, a first virtual synchronous generator determination module, a second comparator, a second regulator, a receiving end active / reactive power determination module, a third phase-locked loop and a second virtual synchronous generator determination module. A reference power set value of a direct current circuit is determined according to power grid frequency firstly; next, a first direct current voltage reference value and a second direct current voltage reference value are determined according to the reference power set value; and finally a transmitting end rectifying station anda receiving end inversion station are adjusted indirectly according to the first direct current voltage reference value and the second direct current voltage reference value to ensure that the transmitting end rectifying station and the receiving end inversion station can work within a safe threshold value range and to prevent a condition that the direct current side voltage is greater than a safethreshold value.

Description

technical field [0001] The invention relates to the technical field of frequency modulation control, in particular to a DC voltage control device, method and optimization method for new energy VSG frequency modulation. Background technique [0002] Due to its non-polluting and sustainable advantages, new energy is considered to be an effective solution to the energy crisis and environmental pollution. However, new energy-rich areas are generally far away from load centers, especially in China, where the problem of reverse distribution of energy resources is very serious. In order to effectively utilize wind energy and solar energy in the western region, it is necessary to develop long-distance large-capacity power transmission technology, among which, the high-voltage direct current transmission technology (VSC-HVDC) based on voltage source converter is favored due to its economy and independent controllability of active and reactive power. has been widely used. [0003] I...

AI Technical Summary

Problems solved by technology

The above existing methods do not consider the interaction between the output power of the AC side and the DC side, so it is easy to cause the voltage of the DC side to exceed the safety threshold

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