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Distributed power flow algorithm of AC-DC system based on modeling of DC tie line on coordination layer

An AC/DC system and DC system technology, applied in the field of AC/DC system distributed power flow algorithm, can solve problems such as errors in calculation and inability to simulate external network disturbances.

Active Publication Date: 2018-05-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The real-time equivalent mode is to perform real-time equivalent on the local external network without iteration, but it cannot simulate external network disturbances, and there are errors in the calculation

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  • Distributed power flow algorithm of AC-DC system based on modeling of DC tie line on coordination layer
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  • Distributed power flow algorithm of AC-DC system based on modeling of DC tie line on coordination layer

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Embodiment Construction

[0058] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0059] attached figure 1 The flow chart of the asynchronous iterative distributed power flow algorithm for the AC-DC interconnection system modeled at the coordination layer based on the DC tie-line, as shown in figure 1 As shown, the method includes the following steps:

[0060] Step 1: Calculate the equivalent parameters of the AC system: through the equivalent calculation of the internal network of the subsystem and the equivalent calculation of the coordination layer, the equivalent parameters of the external network of each AC subsystem are obtained, and the DC tie line does not participate in the equivalent calculation. At the same time, each subsystem calculates the unbalanced power distribution ratio of the outer boundary nodes.

[0061] Step 2: AC and DC system initialization: Each subsystem calculates the combined parameters of the boundar...

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Abstract

The invention discloses a distributed power flow algorithm of an AC-DC system based on modeling of a DC tie line on a coordination layer. The algorithm comprises the following steps of (1) calculatingexternal network equivalent parameters of various subsystems, wherein the DC tie line is not included in the calculation process of the external network equivalent parameters; (2) calculating AC boundary node state quantity combination parameters of the subsystems according to AC boundary node impedance matrix diagonal elements, carrying out power flow initialization calculation of a DC system through the coordination layer, transmitting DC active power and DC reactive power to AC subsystems, correcting injection power of an AC bus connected with a converter station through the subsystems andcarrying out power flow initialization calculation of the subsystems; and (3) carrying out independent power flow calculation of the AC subsystems and alternately carrying out inner iteration and outer iteration until distributed power flow is converged. The problems, such as converter transformer transformation ratio adjustment and control mode conversion caused by changes of operation conditions, of the DC system are conveniently solved.

Description

technical field [0001] The invention belongs to the technical field of power system power flow calculation, and in particular relates to a distributed power flow algorithm of an AC-DC system modeled at a coordination layer by a DC tie line. Background technique [0002] At present, the algorithms for power flow calculation of AC and DC systems at home and abroad can be roughly divided into two categories: unified method and alternating method. The unified method is to supplement the power flow equation of the DC system on the basis of the power flow equation of the AC system, and jointly solve all the state variables of the AC and DC system. The convergence speed of this method is fast, but the amount of modification to the existing AC power flow calculation program is large. Alternate method means that the AC system and the DC system are alternately iteratively solved during the calculation of the power flow. During the calculation of the AC system, the DC system is treate...

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Application Information

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IPC IPC(8): H02J3/06H02J3/36
CPCH02J3/06H02J3/36H02J2203/20Y02E60/60
Inventor 张海波孙长乐
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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