Impedance measurement method and device for onshore doubly-fed wind field through traditional direct-current sending-out system

A technology of impedance measurement and DC component, which is applied in the direction of measuring devices, circuit devices, measuring electrical variables, etc., can solve problems such as lack of analysis, achieve flexible calculation, strong applicability, and solve the effects of analysis and operation stability

Active Publication Date: 2021-01-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] However, at present, there are few results related to the modeling of doubly-fed wind farms via the traditional DC transmission system, and there is still a lack of in-depth analysis, which needs further research

Method used

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  • Impedance measurement method and device for onshore doubly-fed wind field through traditional direct-current sending-out system
  • Impedance measurement method and device for onshore doubly-fed wind field through traditional direct-current sending-out system
  • Impedance measurement method and device for onshore doubly-fed wind field through traditional direct-current sending-out system

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Embodiment Construction

[0043] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0044] The invention provides a method for measuring impedance of an onshore doubly-fed wind field via a traditional DC sending system. The on-shore doubly-fed wind field sent via a traditional DC system includes a doubly-fed wind field subsystem, a traditional DC sending subsystem, and an AC power grid. ,Such as figure 1 shown.

[0045] Among them, the double-fed wind farm subsystem is integrated into the AC power grid through the traditional DC transmission subsystem through the inverter. The schematic diagram of the structure of the doubly-fed wind turbine in the on-shore doubly-fed wind field via the traditional DC transmission system is as follows: figure 2 shown. The structural diagram of the traditional DC sending system is as follows: image 3 shown.

[0046] The flow process of the impedance measurement method provided by the embodiment of t...

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Abstract

The invention discloses an impedance measurement method and device for an onshore doubly-fed wind field through a traditional direct-current sending-out system, which relate to the technical field ofrenewable energy power generation and transmission systems, and are used for realizing impedance measurement of the onshore doubly-fed wind field through the traditional direct-current sending-out system and providing a reliable and accurate data basis for stability analysis. According to the scheme, the method comprises the following steps of acquiring structural parameters of a doubly-fed wind field subsystem, and calculating to obtain a wind field impedance value Zwf(s) at a specific frequency f according to the structural parameters, the control parameters and the related steady-state values of the given doubly-fed wind field subsystem, obtaining the output active power P of the traditional direct-current sending-out subsystem and the output reactive power Q of the traditional direct-current sending-out subsystem, calculating an impedance value ZLCC(s) of the traditional direct-current sending-out subsystem at a specific frequency f, and conducting impedance cascading on the Zwf(s)and the ZLCC(s) to carry out corresponding impedance cascading, and acquiring the total impedance value of the whole onshore doubly-fed wind field under the specific frequency f through a traditionaldirect-current sending-out system.

Description

technical field [0001] The invention relates to the technical field of renewable energy power generation and transmission systems, in particular to an impedance measurement method and device for an onshore doubly-fed wind field via a traditional direct current transmission system. Background technique [0002] With the continuous development of the wind power industry, improving wind energy transmission and consumption capacity has become one of the overall requirements of my country's energy strategy, and the construction of "long-distance, large-scale, high-concentration" wind power transmission has become my country's current and future wind power industry for a considerable period of time. The main way of power generation development and utilization. In order to solve the problem of reverse distribution of wind power resources and loads in the region, further expand the scale of wind power consumption, and improve economic benefits, traditional DC technology has been wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/36H02J3/38G06F17/11G01R27/02
CPCH02J3/00H02J3/36H02J3/381G06F17/11G01R27/02H02J2300/28H02J2203/10H02J2203/20Y02E60/60
Inventor 李震江长明董晓亮白正宇张瑞春黄宝鑫陆昱锟田旭
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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