Offshore wind plant current collection system topology optimization method capable of avoiding resonance area

Abstract

The invention relates to an offshore wind plant current collection topology analysis method capable of avoiding a resonance area, and discloses a resonance risk assessment and current collection system topological structure optimization method for a whole offshore wind farm through an alternating current submarine cable sending-out system (a current collection system, an offshore wind turbine generator considering dynamic characteristics of a variable current control system, a power transformation system, a power transmission system and a grid-connected system). The method comprises the following steps: deducing an impedance model of the current collection system for an offshore wind power plant through the alternating current submarine cable sending-out system, and combining the impedance model with a deduced impedance model of an offshore wind turbine generator, a deduced impedance model of the power transformation system, a deduced impedance model of the power transmission system and a deduced impedance model of the grid-connected system; constructing to obtain an admittance network model of the whole system sent by the offshore wind plant through an alternating current submarine cable; performing singular value calculation and analysis on the basis of the constructed admittance model of the whole system of the offshore wind plant through the alternating current submarine cable sending-out system, drawing a frequency-singular value curve, and judging a resonant frequency point in the system according to amplitude-frequency characteristics of singular values; and changing the topological structure of the current collection system, and changing the frequency point corresponding to the singular value or reducing the amplitude of the singular value.

Description

technical field [0001] The invention relates to the topology optimization of the offshore wind farm sending out system through the AC submarine cable, in particular to the topology optimization of the offshore wind farm power collection system, which optimizes the topology structure of the power collection system from the perspective of changing the resonance area of ​​the system. [0002] technical background [0003] Offshore wind power has been continuously developed and utilized due to its advantages of rich wind resources and low noise. The power collection system of offshore wind farms is an important basis for collecting electric energy and then centralized delivery. Therefore, the topological structure of power collection systems for offshore wind farms is developed Optimization evaluation is of great significance. However, the topology optimization of the existing offshore wind farm power collection system is mainly carried out from the perspective of the cost and re...

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Problems solved by technology

[0005] Aiming at the topological structure of the system sent by the offshore wind farm via the AC submarine cable, on the basis of constructing the impedance model of each component in the system sent by the offshore wind farm via the AC submarine cable, according to the topological structure information of the system sent by the offshore wind farm via the AC submarine cable, Construct the impedance network circuit of the whole system of the offshore wind farm through the AC submarine cable; according to the circuit of the impedance network topology of the offshore wind farm through the AC submarine cable system, use the node admittance method to construct the offshore wind farm through the AC submarine cable Send the admittance network matrix of the system; based on the constructed admittance network matrix, calculate the singular value of the admittance network, judge the resonance risk of the system according to the singular value curve, draw the frequency-singular value curve, and for a singular value at a certain frequency If the amplitude is too high, focus on it; then optimize the submarine cable topology of the collector system to reduce the singular value amplitude of the system or keep the frequency point corresponding to the high amplitude singular value away from the corresponding harmonic source in the system frequency point, thereby reducing the resonance risk in the system by optimizing the topology of the collector system

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