Energy dissipation branch and control method

A branch circuit and energy-consuming unit technology, applied in wind power generation, circuit devices, AC network circuits, etc., can solve problems affecting equipment safety, overvoltage of flexible power transmission systems, etc., to avoid short-circuit discharge, low overall cost, and high cost performance Effect

Inactive Publication Date: 2019-03-29
姜田贵
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  • Abstract
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Problems solved by technology

When the AC power grid at the receiving end fails, the electric energy sent by the offshore wind farm cannot be absorbed, which will cause overvoltage in the flexible transmission system, which will affect the safety of the equipment in severe cases. Therefore, a power grid that can consume the offshore wind farm when the AC system at the receiving end fails Send out wind power to ensure the safe and continuous operation of the energy-consuming branch of the flexible direct current transmission system

Method used

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Embodiment Construction

[0033] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] Such as figure 1 As shown, the first end of the energy consumption branch is connected to the high potential electrode (positive pole) of the DC line, and the second end of the energy consumption branch is connected to the low potential electrode (negative pole) of the DC line; The energy consumption branch is composed of N energy consumption units in series, and N is an integer greater than or equal to 2; where:

[0035] The energy consumption unit includes a DC capacitor branch and an energy consumption branch, the DC capacitor branch and the energy consumption branch are connected in parallel, and the energy consumption branch is composed of a first power semiconductor device T1 (IGBT in this embodiment) It is connected in series with the energy consumption resistor R1, and the DC capacitor branch is composed of a DC capacitor C1 co...

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Abstract

The invention provides an energy dissipation branch and a control method. The energy dissipation branch is formed by connecting N energy-consuming units in series. The energy-consuming unit comprisesa DC capacitor branch and an energy-consuming branch. The DC capacitor branch is connected in parallel with the energy-consuming branch. The energy-consuming branch is formed by connecting a first power semiconductor device and an energy-consuming resistor in series. The DC capacitor branch is formed by connecting a DC capacitor and a current limiting resistor in series. The current limiting resistor is also connected in parallel with a second power semiconductor device. The invention also provides a control method for the energy dissipation branch. The energy dissipation branch has a fast switching function. When an AC power grid on a receiving end has faults, delivered power of an offshore wind farm is consumed, voltage of a flexible DC transmission system is reduced, and the branch hassimple control, and is suitable for engineering applications.

Description

technical field [0001] The invention belongs to the technical field of power electronics in power systems, and in particular relates to an energy-consuming branch and a control method. Background technique [0002] my country is rich in offshore wind energy resources. Compared with onshore wind farms, its advantages are that it does not occupy land resources, is basically not affected by topography, has higher wind speeds, larger single-unit capacity of wind turbines, and higher annual utilization hours. With the implementation of my country's offshore wind power planning and construction, the rapid development of offshore wind power will usher in. In order to ensure the safe and stable operation of the power grid and realize the coordination and sustainable development of renewable energy and power grid, it is necessary to conduct research on the offshore wind power transmission system. [0003] The flexible DC transmission system can connect large-scale offshore wind farms...

Claims

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Application Information

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IPC IPC(8): H02J3/14H02J3/38
CPCH02J3/14H02J3/386Y02B70/3225Y02E10/76Y04S20/222
Inventor 詹长江姜田贵张宝顺姚宏洋
Owner 姜田贵
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