Power control method and device for flexible direct current transmission system
A power transmission system, flexible DC technology, applied in circuit devices, AC network circuits, power transmission AC networks, etc., can solve the problems of power inversion and uncontrolled power on the inverter side.
Active Publication Date: 2021-02-02
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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- Application Information
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Problems solved by technology
[0007] To sum up, when the measured value of the DC voltage between the positive and negative poles on the rectifier side is too high to a certain extent, the power on the inverter side is uncontrolled and the problem of power reversal occurs.
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[0061] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0062] The power control method of the flexible direct current transmission system provided by this application can be applied to such as figure 1 In the application environment shown, figure 1 It is an application environment diagram of a voltage control method for a flexible direct current transmission system in an embodiment. Taking the flexible DC transmission system with back-to-back converter stations as an example, figure 1 It is a structural schematic diagram of the flexible direct current transmission system. The flexible direct current transmission system inclu...
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The present application relates to a power control method and device for a flexible direct current transmission system, comprising the following steps: obtaining the rectification-side positive direct-current voltage, the rectification-side negative direct-current voltage, the inverter-side positive direct-current voltage, and the inverter-side negative direct-current voltage in the flexible direct current transmission system , so as to obtain the judgment result, when the judgment result determines that the power on the inverter side is not under control, limit the maximum current of the first active current and keep the maximum current of the second active current unchanged, where the first active current is The DC voltage loop on the inverter side allows the active current to flow to the converter valve, and the second active current is the active current that the DC voltage loop on the inverter side allows to flow to the AC system. By adopting the method, when the power on the inverter side is not controlled, by limiting the maximum current amount of the first active current, the active current allowed to flow to the converter valve by the DC voltage loop in the inverter side is limited, and the maximum output threshold of the active current is limited, Thereby avoiding the occurrence of uncontrolled power or power reversal phenomenon.
Description
technical field [0001] The present application relates to the technical field of high-voltage grid direct current transmission, in particular to a power control method and device for a flexible direct current transmission system. Background technique [0002] Flexible DC voltage transmission technology is a new type of power transmission technology based on voltage source converters, self-shutdown devices and pulse width modulation technology. There is no need for communication between flow stations and it is easy to form a multi-terminal DC system. [0003] Flexible HVDC systems usually have two operating modes: power transmission mode and static var compensation mode. In the power transmission mode, the rectifier side in the flexible DC transmission system is used to control the DC voltage between the positive and negative poles on the rectifier side, and the inverter side is used to control the positive DC current and the power between the positive and negative DC voltag...
Claims
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IPC IPC(8): H02J3/36H02J3/48
CPCH02J3/36H02J3/48H02J2203/20Y02E60/60
Inventor 朱煜昆郭琦黄立滨李书勇
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD