Active frequency control method and system for offshore wind power plant flexible-direct current grid connection
A technology of active frequency and control method, which is applied in the field of active frequency control method and system of flexible straight grid connection of offshore wind farms, and can solve problems such as inability to support frequency modulation of onshore AC systems
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Embodiment 1
[0040] Such as figure 1 As shown, the embodiment of the present invention provides an active frequency control method for flexible straight grid connection of offshore wind farms. The control method includes the following steps:
[0041] Step S1: Obtain the frequency signal of the access point of the AC power grid of the shore AC system. In the embodiment of the present invention, such as image 3 Shown is a frequency-based frequency active power control transfer function block diagram. In the figure, the onshore AC system uses a phase-locked loop (PLL) to measure the frequency of the AC grid access point of the onshore AC system in real time, and generates the first frequency signal after first-order filtering , is just an example, not a limitation.
[0042] Step S2: Transmitting the frequency signal to the control and protection unit in the onshore converter station of the flexible direct current system. Such as figure 2 As shown, the control and protection unit in the ...
Embodiment 2
[0059] Such as Figure 15 As shown, the embodiment of the present invention also provides an active frequency control system of an offshore wind farm, including:
[0060] The frequency signal acquisition module 1 is used to acquire the frequency signal of the access point of the onshore AC power grid. This module executes the method described in step S1 in Embodiment 1, which will not be repeated here.
[0061] The frequency signal transmission module 2 is used to transmit the frequency signal to the control and protection unit of the onshore converter station of the flexible direct current system. This module executes the method described in step S2 in Embodiment 1, which will not be repeated here.
[0062] The communication system detection module 3 is used to detect whether the inter-station communication system of the onshore converter station of the flexible direct current system and the control and protection system of the offshore wind farm is normal. This module execu...
Embodiment 3
[0072] An embodiment of the present invention provides a computer device, such as Figure 17 As shown, it includes: at least one processor 401 , such as a CPU (Central Processing Unit, central processing unit), at least one communication interface 403 , memory 404 , and at least one communication bus 402 . Wherein, the communication bus 402 is used to realize connection and communication between these components. Wherein, the communication interface 403 may include a display screen (Display) and a keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a wireless interface. The memory 404 may be a high-speed RAM memory (Ramdom Access Memory, volatile random access memory), or a non-volatile memory (non-volatile memory), such as at least one disk memory. Optionally, the memory 404 may also be at least one storage device located away from the aforementioned processor 401 . Wherein the processor 401 can execute the activ...
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