Direct-current power transmission and distribution power flow control device, control strategy and application method thereof
A power flow and control device technology, applied in the direction of power transmission AC network, AC network with the same frequency from different sources, etc., can solve the problems of complex control, high cost, large power consumption, etc., and achieve high economical effect
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Embodiment 1
[0034] Such as Figure 1-5 A power flow control device for DC transmission and distribution shown includes a bus switch 1 , an isolated DC-DC converter 2 with reversible power flow, a four-quadrant DC-DC converter 3 , a filter circuit 4 , and a port protection circuit 5 .
[0035] One end of the bus switch is connected to the input end of the isolated DC-DC converter 2; the output end of the isolated DC-DC converter 2 is connected to the input end of the four-quadrant DC-DC converter 3, and the four-quadrant DC-DC converter 3 The output terminal of the filter circuit 4 is connected to the filter circuit 4, and the two output ports of the filter circuit 4 are connected between the two DC buses A and B; the port protection circuit 5 is respectively connected between the two output ports of the filter circuit 4 and the ground; the power flow adjustment The low-level control algorithm controls the magnitude and direction of the current between the two DC buses A and B, and at the ...
Embodiment 2
[0049] Such as Figure 8 As shown, an application method of a DC transmission and distribution power flow control device, when there are three DC buses in the power supply system, three DC transmission and distribution power flow control devices 6, 7, and 8 are correspondingly configured, and each DC transmission and distribution power flow control device The power flow control devices 6, 7, and 8 are connected between every two adjacent DC buses to adjust the power flow between the DC buses.
Embodiment 3
[0051] Such as Figure 9 As shown, an application method of a DC transmission and distribution power flow control device, when there are three DC buses in the power supply system, correspondingly equipped with three DC transmission and distribution power flow control devices 9, 10, 11, and the three DC transmission and distribution power flow control devices The control devices 9, 10, 11 are connected in series to form an annular multi-port structure, and each port is connected to a DC bus to regulate the power flow between the DC buses.
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