A power flow calculation method for bipolar flexible HVDC transmission system

A power flow calculation and power transmission system technology, applied in power transmission AC networks, AC networks with the same frequency from different sources, etc.

Active Publication Date: 2022-07-29
SOUTHEAST UNIV
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Problems solved by technology

Due to the current correlation between poles, the power flow calculation method for unipolar networks cannot be directly applied to true bipolar systems
The current power flow algorithm has its limitations. It is only suitable for the power flow calculation of unipolar networks or symmetrical bipolar networks. It can only deal with a limited number of control methods, such as pure active control and simple droop control methods. Bipolar DC transmission system, which obviously cannot meet the needs of the rapidly developing DC grid

Method used

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  • A power flow calculation method for bipolar flexible HVDC transmission system
  • A power flow calculation method for bipolar flexible HVDC transmission system
  • A power flow calculation method for bipolar flexible HVDC transmission system

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Embodiment Construction

[0081] The technical solutions provided by the present invention will be described in detail below with reference to specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0082] The present invention provides a corresponding power flow calculation method for the master-slave control mode, the voltage droop control mode or the hybrid control system including the amplitude and phase control in the system, and the power flow calculation is performed separately for the converter stations under different control modes. . Converter stations with different control methods adopt the following power flow calculation methods: For converter stations with master-slave control method: According to the given master station DC voltage and slave station active power, calculate the voltage and active power of each node in the DC grid. , only the slave station...

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Abstract

The invention discloses a method for calculating the power flow of a bipolar flexible direct current transmission system. First, an initial value of positive active power is given, and when calculating, the power flow is first calculated for the positive network, and the initial value of the active power of the negative node is updated according to the calculation result. The negative network performs power flow calculation, and updates the active power of each positive node according to the negative active power obtained by the power flow calculation. After repeated iterative updates, the voltage corrections of the positive and negative nodes reach the convergence condition. The invention has universality for different multi-terminal DC coordinated control strategies and DC networks with different positive and negative topological structures, and can truly and accurately reflect the power flow distribution of the true bipolar system; the method is based on the node current relationship, and selects the initial value of the voltage. It is insensitive and can achieve the same predetermined calculation accuracy of power flow through fewer iterations, and is more suitable for power flow calculation of multi-terminal flexible DC network systems in engineering.

Description

technical field [0001] The invention belongs to the field of flexible direct current power transmission, and relates to a power flow calculation method of a bipolar flexible direct current power transmission system. Background technique [0002] With the continuous development of renewable energy and the needs of current grid technology upgrades, the future development direction of flexible DC grids will focus on large-scale wind power transmission, regional grid interconnection, and power transmission to urban load centers. The flexible DC transmission system will show the following characteristics: [0003] (1) The flexible DC transmission system is developing towards higher voltage levels and larger transmission capacity, the flexible and reliable true bipolar transmission system is developed and applied, and the power grid operation mode is more complicated; (2) The voltage source converter is conducive to the formation of parallel connection type multi-terminal DC tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06H02J3/36
CPCH02J3/06H02J3/36Y02E60/60
Inventor 李周何炎李亚州
Owner SOUTHEAST UNIV
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