Flexible DC power transmission system power control method and device thereof
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: 2018-08-17
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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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 invention relates to a flexible DC power transmission system power control method and a device thereof. The method comprises the following steps of acquiring rectifying-side anode DC voltage, rectifying-side cathode DC voltage, inverting-side anode DC voltage and inverting-side cathode DC voltage in the flexible DC power transmission system, thereby obtaining a determining result; on the condition of a determining result that the power at the inverting side is uncontrollable, restricting highest current amount of first active current and keeping the highest current amount of second activecurrent unchanged, wherein the first active current is the active current which is allowed for flow from a DC voltage ring to a converter valve in the inverting side, and the second active current isthe active current which is allow to flow from the DC voltage ring to an AC system in the inverting side. According to the method, when the power at the inverting side is uncontrollable, the active current which is allowed to flow from the DC voltage ring to the converter valve is restricted through suppressing the highest current value of the first active current, and highest output threshold ofthe active current is restricted, thereby preventing uncontrollable power or power inversion.
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...
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Login to View More 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