Linear determination method and system for power flow of flexible DC power grid
A flexible DC and linearization technology, applied in AC network circuits, AC networks with the same frequency from different sources, circuit devices, etc.
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Embodiment 1
[0050] The present invention provides a method for calculating the linear power flow of the flexible DC grid based on the injection power description and node voltage control considering the control mode of the flexible DC grid. The flow chart is as follows figure 1 shown, including the following steps:
[0051] S1: Establish flexible DC power grid topology description according to constant voltage control and constant power control:
[0052]The present invention takes figure 2 The structure diagram of the 5-node flexible DC power grid shown is taken as an example to carry out subsequent descriptions. The flexible DC power grid with any number of nodes and any connection method can be deduced to obtain the corresponding results. The topology description of the flexible DC power grid is no different from the topology description of the conventional AC power grid. To ensure the integrity of the content description, a brief description is still given here.
[0053] S11, number...
Embodiment 2
[0093] Below to figure 2 The schematic diagram of the 5-node flexible direct grid is taken as an example to illustrate the entire calculation process. First, as shown in the figure, nodes 1, 2, and 3 are constant power control nodes, nodes 4 and 5 are constant voltage control nodes, node 4 has a control voltage of 319.5kv, and node 5 has a control voltage of 320kv. First, according to the formula (10), the equations of the nodes 1, 2, and 3 are as follows:
[0094]
[0095]
[0096]
[0097] According to equation (12), it can be obtained According to equation (13), it can be obtained According to equation (14), it can be obtained
[0098] The sensitivity of the injected power of the fixed power node to the power of all branches can be obtained by bringing the obtained partial derivative into the formula (8).
[0099]
[0100] Similarly, the sensitivity of other nodes to all branches can be obtained, and the results are shown in Table 1.
[0101] Table...
Embodiment 3
[0113] Based on the same inventive idea, the present invention also provides a flexible DC power grid power flow linearization calculation system considering the DC control mode, its structural block diagram is as follows image 3 shown, including:
[0114] The decomposition module 301 is used to decompose the power flow of the flexible DC power grid into: the power flow distribution of the constant voltage control node and the power flow distribution of the constant power control node according to the control mode;
[0115] The first calculation module 302 is used to calculate the power flow distribution of the constant voltage control node;
[0116] The second calculation module 303 is used to calculate the power flow distribution of the constant power control node;
[0117] The third calculation module 304 is used to superimpose the power flow distribution of the constant voltage control node and the power flow distribution of the constant power control node to calculate t...
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