Virtual synchronous machine series compensation grid-connected system subsynchronous oscillation suppression method and control system
A technology of virtual synchronous machine and sub-synchronous oscillation, which is applied in the direction of reducing/preventing power oscillation, AC network circuit, single-network parallel feeding arrangement, etc. concerns and other issues, to achieve the effect of suppressing subsynchronous oscillation, reducing influence, and improving accuracy
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[0023] Circuit of virtual machine series compensation grid-connected system such as Figure 1 Shown. Grid-connected inverter controlled by voltage-type virtual synchronous machine (corresponding Figure 1 Virtual synchronous machine in) is connected to the power grid via series compensation transmission line, in which the inductance L 1 And capacitance C .. 1 Make up LC filter, r 1 Is damping resistance; L inductance g , resistance r g And capacitance C .. 2 Form a series compensation transmission line, inductance L g , resistance r g And capacitance C .. 2 Series connection; V dc Is the DC side voltage of the virtual synchronous machine; i a ,i b And I c Is the filter inductance L. 1 On the current; v a ,v b And v c For the virtual synchronous machine (i.e. grid-connected inverter), the grid-connected voltage.
[0024] Figure 2 There is shown a block diagram of impedance reshaping control based on modulated signals according to an embodiment of the present invention, where H. 1 (s...
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