Power grid frequency modulation method and device

A control method and power grid technology, applied in circuit devices, photovoltaic power generation, electrical components, etc., can solve problems such as prominent operation control problems, inability to provide power system auxiliary services, and strong randomness.

Active Publication Date: 2017-09-19
CHINA ELECTRIC POWER RES INST +2
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under this control method, the output of photovoltaic power generation is volatile and unpredictable, and cannot provide the auxiliary services required by the power system. Therefore, traditional generators should maintain their capacity to provide sufficient auxiliary services.
As the penetration rate of photovoltaic power generation continues to increase, the resulting economic losses have increased significantly
In additio

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power grid frequency modulation method and device
  • Power grid frequency modulation method and device
  • Power grid frequency modulation method and device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0047] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] The topology of the traditional bipolar photovoltaic grid-connected power generation system is as follows: figure 1 As shown, the photovoltaic array is first boosted by the Boost chopper circuit, and then the DC power is converted into AC power through the inverter to realize grid connection. It mainly includes photovoltaic arrays, filter capacitors, Boost choppers, inverters, filters and Communication system and other parts. figure 1 The grid-connected mode shown includes three control parts: ①Inverter double-loop control; ②Boost chopper control; ③Maximum power tracking control. By controlling the switching device action strategy of the chopper, the maximum power point tracking of the photovoltaic array can be realized. The inverter mainly implements grid-connected control, and its control system adopts a double-loop c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a power grid frequency modulation method and device. The method comprises steps of determining a photovoltaic power supply active power reference value and a voltage/current outer feature curve of a photovoltaic power supply, determining output power of the photovoltaic power supply, and generating an output P-U curve of the photovoltaic power supply; searching voltage corresponding to the active power reference value of the photovoltaic power supply on the output P-U curve of the photovoltaic power supply and defining the voltage to be a photovoltaic power supply outlet direct current voltage reference value; and fitting the photovoltaic power supply outlet direct current voltage reference value and grid-connected side frequency, and generating a photovoltaic power supply frequency modulation control feature curve. According to the invention, by changing the output power of a photovoltaic plant, the network relating features of the photovoltaic plant are improved; and it is achieved that the photovoltaic power supply participates in the system frequency modulation.

Description

technical field [0001] The invention relates to a control method and device, in particular to a power grid frequency modulation control method and device. Background technique [0002] Solar energy is clean, non-polluting and rich in resources, which can effectively alleviate the pressure on the power industry caused by the energy crisis and environmental crisis. In recent years, the solar photovoltaic industry has developed rapidly, and the installed capacity of power generation has continued to grow. [0003] When the installed capacity of photovoltaic power generation is low, the impact of grid-connected operation on the grid is negligible. Meanwhile, considering the high cost of photovoltaic power generation, it usually operates in a maximum power point tracking (MPPT) mode. Under this control method, the output of photovoltaic power generation is volatile and unpredictable, and cannot provide the auxiliary services required by the power system. Therefore, traditional ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/385Y02E10/56
Inventor 王志冰迟永宁李琰王西田
Owner CHINA ELECTRIC POWER RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap