A natural gas differential pressure power generation system and its control method

Abstract

The invention discloses a natural gas differential pressure power generation system and a control method of the natural gas differential pressure power generation system. The power generation system comprises an electromagnetic valve, an electric adjusting valve, a fluid motor, an excitation explosion-proof generator, a PLC control cabinet, a voltage and frequency stabilizing device, an inverter, a storage battery pack and a UPS power source. The electromagnetic valve, the electric adjusting valve and the fluid motor are installed on a power generation pipeline. The excitation explosion-proof generator is connected with the fluid motor. The PLC control cabinet is connected with the electromagnetic valve, the electric adjusting valve, an excitation module of the excitation explosion-proof generator and the UPS power source. The excitation explosion-proof generator is connected with a voltage and current detection module in the PLC control cabinet and then connected with the input end of the voltage and frequency stabilizing device. The voltage and frequency stabilizing device is connected with the PLC control cabinet and the input end of the inverter respectively. The inverter is connected with the storage battery pack. The storage battery pack is connected with the UPS power source. The UPS power source is connected with the PLC control cabinet. The natural gas differential pressure power generation system has the advantages of being simple in structure, safe, stable, good in electricity quality and high in automation degree. The control method has the advantages of being reasonable in logic, high in controllability and high in safety.

Description

technical field [0001] The present invention relates to a power generation equipment, in particular to a system for generating power by utilizing the pressure difference of natural gas, and a method for controlling the system. Background technique [0002] Natural gas is an essential and important energy source in people's lives, and its transmission needs to go through a process from high pressure to low pressure before it can be used by people. At present, in the natural gas pipeline network, the pressure regulating station is mainly set up to convert from high pressure to low pressure, and there will be a large amount of natural gas pressure energy in the process of pressure regulation. If it cannot be effectively used, resources will be wasted in vain. In recent years, in order to utilize the pressure energy generated during the pressure regulation process of natural gas, those skilled in the art have researched and developed projects that use the pressure energy of natu...

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Problems solved by technology

[0004] In order to solve the problems of small power generation scale, unstable operation, low power quality, and poor continuous power supply capacity existing in natural gas power generation devices in the prior art, a natural gas differential pressure power generation system provided by the present invention includes solenoid valves, electric adjustment Valves, fluid motors, excitation anti-explosion motors, PLC control cabinets, voltage and frequency stabilization devices, inverters, battery packs and UPS power supplies, wherein the solenoid valves, electric regulating valves and fluid motors are installed in sequence from upstream to downstream On the power generation pipeline, the excitation anti-explosion motor is connected to the fluid motor through a coupling. The PLC control cabinet is equipped with a voltage and current detection module. The excitation module of the machine is connected to the UPS power supply, the power generation output of the excitation anti-explosion motor is connected to the voltage and current detection module in the PLC control cabinet through the power line, and then connected to the input terminal of the voltage and frequency stabilization device, and the output terminal of the voltage and frequency stabilization device Connect to the input end of the PLC control cabinet and the inverter through the power line, the output end of the inverter is connected to the input end of the battery pack through the power line, the output end of the battery pack is connected to the input end of the UPS power supply, and the output end of the UPS power supply Connect with the PLC control cabinet; when installing and using, connect the power generation pipeline with the pressure regulating pipeline of the natural gas station in parallel, connect the upstream end to the high-pressure pipe network, and connect the downstream end to the low-pressure pipe network; let the station 380 / 220V electrical equipment Connect the output end of the voltage and frequency stabilization device and the output end of the UPS power supply respectively through the power line, and connect the 24V electric meter of the natural gas pipeline to the output end of the battery pack through the power line

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