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Linear calculation method for power flow of bipolar direct-current power distribution network

A technology of DC distribution network and calculation method, which is applied in the direction of DC network circuit devices, DC circuits with more than three wires, and AC network circuits, etc., can solve the problems of insufficient speed of power flow calculation of bipolar DC distribution network, and achieve simplified power flow calculation Difficulty, avoiding multiple iterations, and improving the effect of power flow calculation speed

Active Publication Date: 2021-08-06
CHONGQING UNIV
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Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned technologies, the present invention provides a linearized calculation method for the power flow of the bipolar DC distribution network, which solves the problem of insufficient rapidity of the power flow calculation of the bipolar DC distribution network

Method used

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  • Linear calculation method for power flow of bipolar direct-current power distribution network
  • Linear calculation method for power flow of bipolar direct-current power distribution network
  • Linear calculation method for power flow of bipolar direct-current power distribution network

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Embodiment Construction

[0026] refer to figure 1 As shown, the bipolar DC distribution network consists of three lines, namely, the positive line, the neutral line, and the negative line, denoted by "p", "nu", and "n" respectively. All nodes are divided into power supply nodes and load nodes. The power supply nodes are the nodes corresponding to the converter outlets connected to the large AC power grid, and are constant voltage nodes. The total number of nodes in the network is M, and there are N load nodes (numbered 1-N) and M-N power nodes (numbered 0, N+1~M-1). The loads in the bipolar DC distribution network are divided into three types according to the different connected lines: positive load, negative load and bipolar load, respectively represented by L p , L n , L b express. The positive load is the load connected between the positive pole and the neutral line (the direction from the positive pole to the neutral line is specified as the positive direction), the negative load is the load c...

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Abstract

The invention discloses a linear calculation method for power flow of a bipolar direct-current power distribution network. The method comprises the following steps of: writing node voltage equations on a positive pole line, a neutral line and a negative pole line for load nodes; obtaining a network model of the bipolar direct-current power distribution network through linear transformation of pairwise subtraction; and obtaining a constant power load linearization model by using Taylor expansion at a working point and rejection of a high-order term; integrating the network model and the constant power load linearization model to obtain a linearization port voltage solving model; substituting actual network parameters into the model, obtaining network load node port voltage; and calculating node-to-ground voltages on the positive pole line, the neutral line and the negative pole line, so as to calculate branch current and branch power, thereby completing the calculation of the linear power flow of the bipolar direct-current power distribution network.

Description

technical field [0001] The invention relates to the field of power flow calculation of a direct current distribution network, in particular to a method for calculating the power flow of a bipolar direct current distribution network. Background technique [0002] Compared with the AC distribution network, the DC distribution network has the advantages of less conversion links, low line loss, large power supply capacity, and high power supply reliability. The topology of DC distribution network can be divided into unipolar and bipolar. Different from the unipolar DC distribution network, the bipolar DC distribution network has the characteristics of multiple voltage levels, multiple power supply circuits, and reliable grounding. The power supply mode is more flexible and the power supply reliability is higher. [0003] Power flow calculation is the basis of power grid construction planning, operation control, power quality monitoring and protection configuration. Due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J1/08
CPCH02J3/36H02J1/082H02J2203/10H02J2203/20Y02E60/60
Inventor 周念成张渝王强钢廖建权
Owner CHONGQING UNIV
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