A method for primary frequency modulation of wind farms based on supercapacitors and DC bus capacitors

A technology of DC bus capacitors and super capacitors, which is applied in wind power generation, electrical components, circuit devices, etc., can solve the problems of coordination and control without super capacitors and DC bus capacitors, and achieve primary frequency modulation, good primary frequency modulation, and resource saving. Effect

Active Publication Date: 2021-05-04
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it only provides frequency support to the grid by controlling the supercapacitor, and does not coordinate and control the supercapacitor and the DC bus capacitor

Method used

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  • A method for primary frequency modulation of wind farms based on supercapacitors and DC bus capacitors
  • A method for primary frequency modulation of wind farms based on supercapacitors and DC bus capacitors
  • A method for primary frequency modulation of wind farms based on supercapacitors and DC bus capacitors

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Embodiment Construction

[0021] Specific examples of the present invention are given below. The specific embodiments are only used to further describe the present invention in detail, and do not limit the protection scope of the claims of the present application.

[0022] The invention provides a method (abbreviation method) for realizing primary frequency modulation of a wind farm based on a supercapacitor and a DC bus capacitor, which is characterized in that it comprises the following steps:

[0023] Step 1, connect supercapacitors in parallel on the DC bus side of the wind farm;

[0024] Step 2. When the power system is running normally, the frequency is 49.5-50.2HZ, and there is no need for the wind farm to support the power system. At this time, the controller uses the power system frequency, output power and power system voltage as input to control On and off of the DC bus switch, connect the super capacitor, disconnect the traditional DC bus capacitor, use the super capacitor as the voltage r...

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Abstract

The invention discloses a method for realizing primary frequency modulation of a wind farm based on a supercapacitor and a DC bus capacitor: (1) connecting a supercapacitor in parallel on the DC bus side of the wind farm; (2) connecting the supercapacitor and disconnecting the traditional DC bus capacitors, use super capacitors to act as DC bus capacitors; (3) When the power system fails, connect super capacitors and connect traditional DC bus capacitors at the same time, so that traditional DC bus capacitors can act as DC bus capacitors, and super capacitors can act as DC bus capacitors. Energy storage link; (4) When the frequency of the power system is still low, reduce the set value of the DC bus voltage on the DC bus side of the wind farm. In this method, a supercapacitor is connected in parallel on the side of the traditional DC bus, and the input and cut-out of the traditional DC bus capacitor and the supercapacitor are controlled, and the primary frequency modulation of the wind farm is realized through the interactive control between the two.

Description

technical field [0001] The invention relates to the field of wind farms, in particular to a method for realizing primary frequency modulation of wind farms based on supercapacitors and DC bus capacitors. Background technique [0002] The current global energy structure is shifting from fossil energy to clean energy. As a clean energy with commercial development potential, wind energy is currently being widely used. The proportion of wind power in the power system has shown a gradual increase in recent years. However, due to the randomness and volatility of wind power, the access of large-scale wind turbines will affect the safety and stability of power system operation and power quality. Ensuring the frequency stability of the power system with high wind power penetration rate is an important task to maintain the safe operation of the power system. Not only does the traditional thermal power generation unit need to participate in the primary and secondary frequency regulati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38H02J3/28
CPCH02J3/386H02J3/24H02J3/28Y02E10/76
Inventor 张家安仇海波李志军王华君
Owner HEBEI UNIV OF TECH
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