A multi-equipment collaborative suppression method for broadband oscillation in an offshore wind power grid-connected system
A multi-device collaborative, offshore wind power technology, applied in neural learning methods, power transmission AC networks, reducing/preventing power oscillations, etc. Adaptive, comprehensive inhibition effect is better
Active Publication Date: 2022-06-24
LIYANG RES INST OF SOUTHEAST UNIV
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Problems solved by technology
[0003] The offshore wind power flexible straight system is a power electronic device with a high penetration rate of renewable energy, a large proportion, coexistence of multiple control strategies, and complex operating conditions.
The existing oscillation suppression controller of the offshore wind power flexible grid-connected system realizes the control of additional variables by pre-designing the control parameters to suppress the oscillation, but for the offshore wind power flexible grid-connected system with complex operating conditions, its single control It is difficult for the strategy to have a good suppression effect on the oscillation under various working conditions
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[0061] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. as a limitation of the present invention.
[0062] like figure 2 As shown, taking the direct-drive wind turbine offshore wind power flexible direct grid-connected system as an example, the wind turbine is directly connected to the direct-drive permanent magnet synchronous generator (PMSG), and is boosted to 35kV by the transformer after the back-to-back converter. Finally, it is transmitted from the AC line to the busbar, and is connected to the flexible DC transmission system (voltage source converter based high voltage direct current, VSC-HVDC) through the step-up transformer of the offshore converter station. Connected to the AC power grid.
[0063] Equivalent model of offshore wind power flexible direct system, wind turbine grid-side contr...
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The invention discloses a multi-equipment collaborative suppression method for broadband oscillation of an offshore wind power flexible grid-connected system. Sorting, selecting the corresponding components of the first two participation factors, designing the input amount and action amount of deep reinforcement learning, based on the control model of each component, converting the problem of multi-device cooperative suppression of broadband oscillation into a Markov decision process, and using deep reinforcement A learning algorithm solves, trains a deep reinforcement learning module and uses it to suppress broadband oscillations. The invention can effectively suppress the oscillation generated during the operation of the offshore wind farm through the multi-terminal cooperative control participated by the reinforcement learning agent, and ensure the stable operation of the offshore wind power flexible straight system.
Description
technical field [0001] The invention relates to the field of power electronic system stability control, in particular to a method for multi-equipment collaborative suppression of broadband oscillation in an offshore wind power flexible, direct and grid-connected system. Background technique [0002] With the advancement of wind power technology, offshore wind power has become an important direction for the development of renewable energy. Judging from the current global offshore wind power development and planning, offshore wind power development is gradually advancing from near-coast to far-coast. my country's offshore wind power is also in a leap-forward development stage from offshore to far-sea, from small-capacity wind farms to large-scale wind power bases. With the increase of offshore distance, the economic advantages of AC transmission technology will gradually weaken, and HVDC transmission technology will become one of the effective methods for large-scale long-dis...
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IPC IPC(8): H02J3/24H02J3/38H02J3/36G06N7/00G06N3/08
CPCH02J3/241H02J3/381H02J3/36G06N3/08H02J2203/20H02J2300/28G06N7/01Y02E60/60
Inventor 冯双戴礼国雷家兴汤奕
Owner LIYANG RES INST OF SOUTHEAST UNIV