Power compensation and energy recovery device for gas power generation system

An energy recovery device and power generation system technology, which is applied in the field of electrical and power engineering, can solve problems such as power supply system voltage rise, power generation system shutdown, accidents, etc., and achieve the effects of improving utilization, ensuring stable operation, and saving energy consumption

Inactive Publication Date: 2015-07-15
CHINA XD ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, hoisting machinery, mine machinery, transportation equipment and other types of loads are in the power generation operation state when decelerating, braking or reversing, which will generate regenerative energy and feed back to the power supply system. If it is not eliminated in time, the voltage of the power supply system will increase. It will also cause the power generation system to shut down or even cause accidents, hindering the operation of the system; so at present, braking resistors are often used to consume them

Method used

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  • Power compensation and energy recovery device for gas power generation system
  • Power compensation and energy recovery device for gas power generation system
  • Power compensation and energy recovery device for gas power generation system

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Embodiment 1

[0038] The power generation system is powered by a generator set with a rated power of 20kW, which drives the motor to run through the frequency conversion device; the supercapacitor energy storage module is composed of 90 200F supercapacitors in series, and is connected in parallel to the intermediate DC bus of the frequency conversion device through a bidirectional DC / DC converter. In the rated running state, the voltage of the DC bus of the frequency conversion device is 480V.

[0039] At 10s, the load power suddenly increased by 2kW, which lasted for 0.5s and then recovered, causing a power fluctuation to the above power generation system; and at 20s, the load power suddenly increased by 5kW, which lasted for 0.5s and then recovered. The voltage of the DC bus in the middle of the frequency conversion device and the operating status of the power generation system are respectively detected when the power compensation and energy recovery device of the present invention is not ...

Embodiment 2

[0045] Still take the power generation system described in Embodiment 1 as an example.

[0046] At 10s, the load feeds back energy to the power generation system with a power of 2kW, which lasts for 1s and then recovers, causing a voltage fluctuation to the above-mentioned power generation system; at 20s, the load feeds energy back to the power generation system with a power of 5kW, which lasts for 0.5s and then recovers. The voltage of the intermediate DC bus of the frequency conversion device and the operating state of the power generation system are respectively detected when the device of the present invention is not used and when it is put into use.

[0047] (1) Do not put into the power compensation and energy recovery device of the present invention

[0048] For the voltage waveform of the intermediate DC bus of the frequency conversion device, see Figure 5 shown. It can be seen that the bus voltage rises suddenly from 480V to 535V due to the load feedback energy at ...

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Abstract

The invention discloses a power compensation and energy recovery device for a gas power generation system. The power compensation and energy recovery device comprises a super capacitor energy storage module, a two-way DC/DC converter, an energy management system, a detection unit and a fluctuation stabilizing device, wherein the super capacitor energy storage module is connected with a middle DC bus of a converter of the power generation system through the two-way DC/DC converter, the detection unit detects voltage and current states of the power generation system and the super capacitor energy storage module and transmits information to the energy management system, the energy management system controls the operation of the two-way DC/DC converter through calculation and analysis so as to control energy exchange between the energy storage module and the power generation system, corresponding energy is absorbed or released as required during load fluctuation, the power fluctuation is stabilized, the power of the power generation system is adjusted to be balanced, and safe and stable operation of the system is guaranteed; besides, the energy utilization rate is effectively increased due to absorption and utilization of regenerated energy produced by load brake.

Description

technical field [0001] The invention belongs to the field of electrical and power engineering, and relates to a power compensation and energy recovery device for a gas-fired power generation system. Background technique [0002] At present, fuel-fired generator sets are used for power supply in many occasions. Traditional fuel-fired power generation systems have serious pollution and high fuel costs; as a clean fuel, gas has the advantages of low pollution and low cost. Compared with fuel-fired power generation, gas Power generation can reduce carbon dioxide and nitrogen oxide emissions by more than 50%, and the cost is only half of that of fuel-fired power generation. If gas is used as energy for power generation, the environmental protection and economy of power generation will be greatly improved. However, due to the soft mechanical properties of the gas generator set and poor load impact resistance, it is not enough to provide or absorb high enough power when the load fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32
Inventor 闫新育刘水平董海健
Owner CHINA XD ELECTRIC CO LTD
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