A multifunctional distributed power grid-connected device based on a nine-switch tube inverter
A technology of distributed power supply and nine switching tubes, which is applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc., and can solve problems such as threatening the safety of power grid operation, increasing system loss, and resonance of power grid parameters , to achieve flexible operation mode, improve power quality, and reduce heat dissipation pressure
Active Publication Date: 2019-05-28
SOUTHEAST UNIV +2
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Problems solved by technology
Among them, the passive equipment has the advantages of simple structure and principle, high operation reliability, and low maintenance cost, but there is also a potential danger of resonance with the grid parameters, and when the system operates in a small way, it is easy to cause reactive power compensation and increase the system loss, threatening the safety of power grid operation
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[0041] The present invention will be further described below in conjunction with the accompanying drawings.
[0042] The invention adopts a nine-switch tube inverter as a power electronic main circuit, and provides two independent output ports for a distributed power grid-connected device.
[0043] figure 1 The topological relationship between the twelve-switch tube inverter and the nine-switch tube inverter is given. figure 1 The left side of the figure is the more commonly used back-to-back twelve-switch tube inverter. figure 1 The right side is the new nine switching tube inverter. It can be seen that the nine-switch tube inverter and the twelve-switch tube inverter can also provide two sets of three-phase output ports, but the nine-switch tube inverter can save three switch tubes compared with the twelve-switch tube inverter. Through comparison, it can be seen that the nine-switch tube inverter has the advantages of compact structure and low cost. Therefore, the two ou...
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The invention discloses a multifunctional distributed power supply grid-connection device based on a nine-switch-tube inverter. When a power grid operates normally, one output port of the NSI is connected to a power distribution network through a grid-connection transformer, electric energy generated by a micro-source is inverted into an alternating current meeting grid-connection conditions, and DC bus voltage of a current transformer is kept stable; the other output port of the NSI is connected to a power grid in a parallel manner, and a harmonic current compensation value is added to a current loop to improve power grid electric energy quality; and when the power grid has fault, low-voltage ride through of a distributed power supply is realized through coordinative cooperation between the two output ports of the NSI. Compared with a back-to-back inverter structure, the device not only can save three switch tubes and reduce system cost, but also can carry out compensation on the power quality problem of the power distribution network, thereby realizing LVRT of the distributed power supply under the fault state of the power distribution network and improving operation safety and stability of the power grid after the distributed power supply is accessed.
Description
technical field [0001] The invention relates to a configuration scheme of a multifunctional distributed power grid-connected device based on a nine-switch tube inverter (NSI), which is suitable for the grid-connected control of distributed power sources, and is used to compensate for a large number of non-linear and impact loads caused by To solve the harmonic pollution problem of the public power grid, realize the low-voltage ride-through of the distributed power inverter in the grid fault state, and design a new type of distributed power grid-connected inverter device based on the topology of the nine-switch tube inverter , belonging to the technical field of distributed power generation. Background technique [0002] With the depletion of traditional fossil energy on the earth, renewable energy has become a new research hotspot in the world. Among them, the photovoltaic and wind power industries are developing rapidly, and the technology is relatively mature, and large-s...
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IPC IPC(8): H02J3/38H02J3/18H02M7/5387
CPCY02E40/30
Inventor 吴在军施烨王秀茹周旭峰史文萍赖勇
Owner SOUTHEAST UNIV