Stability control system for separated isolated network operation of thermal power plant generator and power grid system

Abstract

The utility model discloses a stability control system for separation isolated network operation of a thermal power plant generator and a power grid system. The stability control system comprises a main transformer connected with a wire inlet circuit, the wire inlet circuit is connected with a reverse power protection device, the reverse power protection device is connected with a main console, and the main console is connected with the main transformer; the main transformer is connected with a gasification workshop gasification mill, a thermoelectric workshop thermoelectric mill, a finished product packaging transformer, a maintenance transformer, a coal conveying transformer, a raw water power substation, a circulating water pump, an ammonia-alcohol transformer, a gasification workshop deoxygenization water pump and an ash water circulating pump through a power transmission bus; the power transmission bus is also connected with a generator; the gasification mill, the thermoelectric workshop thermoelectric mill, the finished product packaging transformer, the maintenance transformer, the coal conveying transformer, the raw water power substation, the circulating water pump, the ammonia alcohol transformer, the gasification workshop deoxygenization water pump and the ash water circulating pump are all connected with a frequency voltage emergency control device.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power plant circuit control, in particular to a stabilizing control system for thermal power plant generators and power grid systems to separate and operate in isolated networks. Background Art

[0002] When the self-contained generator of a thermal power plant is connected to the power grid and operated, the generator power meets normal production needs. However, when the power grid fails to meet power supply requirements, such as lightning strikes or ground short circuits, the power supply system power will be unbalanced, causing the power supply system frequency to drop and the voltage to fluctuate. It may even cause the generator to feed power back to the power supply system, dragging down the self-contained generator of the thermal power plant, causing the entire system in the plant to lose power, and resulting in production interruption accidents. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of this utility model is to provide a stable control system for the isolated operation of the thermal power plant generator and the power grid system, which can ensure the power supply of the thermal power plant when the power grid system fails. The specific technical solution is as follows:

[0004] A stabilization control system for the isolated operation of a thermal power plant generator and a power grid system, comprising a main transformer connected to an incoming line circuit, the incoming line circuit is connected to a reverse power protection device, the reverse power protection device is connected to a main console, and the main console is connected to the main transformer; the main transformer is connected to a gasification mill in a gasification workshop, a thermoelectric mill in a thermoelectric workshop, a finished product packaging transformer, a maintenance transformer, a coal transportation transformer, a raw water substation, a circulating water pump, an ammonia-alcohol transformer, and a deoxygenation water pump in a gasification workshop through a transmission bus; the transmission bus is also connected to a generator; the gasification mill, the thermoelectric mill, the finished product packaging transformer, the maintenance transformer, the coal transportation transformer, the raw water substation, the circulating water pump, the ammonia-alcohol transformer, and the deoxygenation water pump are all connected to a frequency and voltage emergency control device.

[0005] The utility model can make the generator run in an isolated grid when the power supply system fails to meet the power demand of the thermal power plant. When the power generation cannot meet the power load of production, the power load is cut off in a preset round according to the importance of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the utility model process. DETAILED DESCRIPTION

[0007] The following is combined with Figure 1 The utility model is further described with examples.

[0008] A stabilization control system for the isolated operation of a thermal power plant generator and a power grid system, comprising a main transformer 2 connected to an incoming line circuit 1, the incoming line circuit is connected to a reverse power protection device 3, the reverse power protection device 3 is connected to a main console 4, and the main console 4 is connected to the main transformer 2; the main transformer 2 is connected to a gasification mill 5 in a gasification workshop, a thermoelectric mill 6 in a thermoelectric workshop, a finished product packaging transformer 7, a maintenance transformer 8, a coal transportation transformer 9, a raw water substation 10, a circulating water pump 11, an ammonia-alcohol transformer 12, and a deoxygenation water pump 13 in a gasification workshop through a transmission bus 14; the transmission bus 14 is also connected to a generator 15; the gasification mill 5, the thermoelectric mill 6, the finished product packaging transformer 7, the maintenance transformer 8, the coal transportation transformer 9, the raw water substation 10, the circulating water pump 11, the ammonia-alcohol transformer 12, and the deoxygenation water pump 13 are all connected to a frequency and voltage emergency control device 16.

[0009] The reverse power protection device 3 samples the current and voltage of the incoming circuit 1 to determine the incoming power direction. When the reverse power value reaches the preset value, the main console 4 cuts off the grid-connected switch on the low-voltage side of the main transformer 2, so that the generator 15 operates in an isolated grid. When the power generated by the generator 15 cannot meet the production power load, the frequency and voltage emergency control device 16 starts to cut off the active load according to the predetermined plan. The cutting plan is to cut off the unimportant first and the important later. For example, in the first round: when the frequency of the generator 15 drops to 49.5Hz and lasts for 1.0 second, the power consumption of the gasification workshop gasification mill 5, the thermal power workshop thermal power mill 6, the finished product packaging transformer 7, the maintenance transformer 7, the coal transportation transformer 9, and the raw water substation 10 is cut off, and the power load of about 7310kW can be thrown off. In the second round: when the frequency of the generator 15 continues to drop to 49.0Hz and lasts for 4.0 seconds, the power consumption of the circulating water pump 11 is cut off, and the power load of about 5480kW can be thrown off. Round 3: When the frequency of generator 15 continues to drop to 48.5Hz and lasts for 6.0 seconds, the power consumption of ammonia transformer 12 is eliminated, and the power load of about 1500kW can be eliminated. Round 4: When the frequency of generator 15 continues to drop to 48.0Hz and lasts for 15.0 seconds, the power consumption of deoxygenation water pump 13 in the gasification workshop is eliminated, and the power load of 2230kW can be eliminated.

[0010] The present invention may also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations all fall within the protection scope of the claims of the present invention.

Claims

1. A stabilization control system for the isolated operation of a thermal power plant generator and a power grid system, characterized in that: It includes a main transformer connected to the incoming circuit, the incoming circuit is connected to the reverse power protection device, the reverse power protection device is connected to the main console, and the main console is connected to the main transformer; the main transformer is connected to the gasification mill in the gasification workshop, the thermoelectric mill in the thermoelectric workshop, the finished product packaging transformer, the maintenance transformer, the coal transportation transformer, the raw water substation, the circulating water pump, the ammonia-alcohol transformer, and the deoxygenation water pump in the gasification workshop through the transmission bus; the transmission bus is also connected to the generator; the gasification mill, the thermoelectric mill, the finished product packaging transformer, the maintenance transformer, the coal transportation transformer, the raw water substation, the circulating water pump, the ammonia-alcohol transformer, and the deoxygenation water pump are all connected to the frequency and voltage emergency control device.

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