Offshore large direct-drive switch reluctance wind driven generator power converter and system thereof

Abstract

The invention provides an offshore large direct-drive switch reluctance wind driven generator power converter and a system of the converter. The converter is composed of a switch reluctance wind turbine, a power converter body, a DC / DC converter body and a system controller. The switch reluctance wind turbine is connected with the power converter body. The power converter body is connected with the DC / DC converter body. Output of the DC / DC converter body is connected with output of a DC / DC converter body of the other switch reluctance wind driven generator power converter system in series or parallel and then outputs electric energy to the shore through a direct-current submarine cable. The system controller is connected with the power converter body and connected with the DC / DC converter body. The switch reluctance wind turbine is connected with the system controller. According to the system, two-phase windings of a four-phase switch reluctance generator can work at the same time, exciting voltage is adjustable, the function of outputting direct-current voltage and adjusting boost can be achieved, the power density and the controllable flexibility are improved, and the power converter is suitable for the field of offshore large wind power plants.

Description

technical field [0001] The invention relates to the field of offshore wind power generation, in particular to a large direct-drive switched reluctance wind power generator power converter and a system thereof for an offshore wind farm. Background technique [0002] Compared with land wind energy, the advantage of offshore wind energy is that the wind speed is higher and the wind force is more sustainable. In my country, the wind speed in open sea areas is 30%-40% higher than that on land on average, and 15%-20% higher in offshore areas. It is used for power generation It can generate 50%-70% more electric energy. [0003] Although people have been developing wind power for fifty years, they are mainly concentrated on land, and experience in building large-scale offshore wind farms is relatively lacking; the main disadvantage of offshore wind power is the construction of towers and platforms (offshore substations) in seawater and The installation cost of generator sets is qui...

AI Technical Summary

Problems solved by technology

[0009] Due to its direct output of pulsating direct current, switched reluctance generators are completely different from other mainstream wind turbines, so their power converters are also different. In terms of research and practice of switched reluctance generator power converters, Most of them are aimed at power converters of small and medium power levels, but they also have certain reference significance. At present, the main circuit of power converters of switched reluctance generators mostly adopts an asymmetrical half-bridge structure, but its structure is relatively complicated, and too many electrical components are used. , Literature: Peng Hanmei, Yi Lingzhi, etc. Simple power converter control under separate excitation mode of switched reluctance generator [J]. Acta Solar Sinica, 2012, 33(8). A simple structure of power converter main The circuit structure has important practical value, however, it can only guarantee the operation of one-phase winding at any instant

[0010] The working process of the switched reluctance generator is divided into two stages: excitation and power generation, and it is carried out in time-sharing. The excitation mode is divided into separate excitation and self-excitation. In view of the fact that increasing the excitation voltage is beneficial to increase the winding current during subsequent freewheeling power generation In order to increase the output power and change the problem that the traditional excitation voltage cannot be adjusted online, some new circuit structures of the excitation part of the power converter that can adjust the excitation input voltage online according to the requirements of the control system have emerged in recent years, such as: 1. Peng Hanmei, Yi Lingzhi et al. New Excitation Mode of Switched Reluctance Generator Based on Buck Converter[J]. Acta Solar Sinica, 2012, 33(3). Research on the hardware structure of the system [J]. Ship Electric Technology, 2012, 32(2). It has greatly promoted the development of the switched reluctance generator power converter system; however, they are generally aimed at small and medium power applications

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