Antomatic quasi-simultaneous interconnecting method of leftover pressure turbine generating unit of high furnace gas
A power generation device and blast furnace gas technology, applied in the field of power engineering machinery, can solve problems such as economic losses, affecting the normal operation of other equipment, power outages in the upper-level power grid, etc., and achieve the effect of accurate parameter setting and reasonable selection of detection devices
Active Publication Date: 2007-09-05
XIAN SHAANGU POWER
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Problems solved by technology
[0003] Manual quasi-synchronization grid connection is that the operator observes the manual quasi-synchronization table to merge the blast furnace gas residual pressure turbine power generation device into the grid according to his own experience; this method has a low success rate and poor reliability, and the success of the grid connection depends on the experience of the operator There is a direct relationship. If the timing of grid connection is not well grasped, it is easy to cause impact on the user's power grid. If the operator is not experienced, it is easy to occur asynchronous grid connection, causing power outages in the superior power grid, affecting the normal operation of other equipment, and causing immeasurable economic loss
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[0050] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0051] According to the above-mentioned technical scheme, the present invention comprises the following steps:
[0052] 1) First, the synchronous detection relay SYN3000 is used as the detection element; and it is equipped with step-up, step-down, speed-up, speed-down, closing relays; the voltage, frequency, phase angle signal (TQMa, TQMb) of the grid side and the The voltage, frequency, and phase angle signals (TQMa', TQMb) are sent to the synchronous detection relay SYN3000; see Figure 1 for the specific circuit.
[0053] 2) When the TRT speed rises to 90% of the rated speed, a signal is sent through the PLC (or DCS) control system of the unit as the automatic input signal of the synchronous detection relay (Fig. 1).
[0054]In Figure 1, 220VAC is the working power supply of the synchronous detection relay SYN3000, which is connected through FU3, FU4 fuses...
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Synchronization detection relay as detecting unit constituting detecting device is setup between turbogenerating equipment and electric network. The method includes steps: sending voltage, frequency and phase angle signals at electric network side, and voltage, frequency and phase angle signals at generator side to synchronization detection relay; when TRT rotate speed rises to 90% of rated speed, machine set PLC or DCS control system sends out signal, which is as signal to start up synchronization detection relay automatically to set internal parameters; synchronization detection relay detects voltage difference, frequency difference and phase angle difference, and sends signal of voltage increase or decrease through intermediate relay to excitation and regulation system of generator to adjust voltage, as well as sends pulse signal of rotate speed to machine set PLC or DCS control system to adjust rotate speed. When condition is met, TRT generator merges into electric network automatically.
Description
technical field [0001] The invention belongs to the field of power engineering machinery, and relates to a method for automatic quasi-synchronous grid connection of a blast furnace gas residual pressure turbine power generation unit (Blast Furnace Top Gas Recovery Turbine Unit, hereinafter referred to as TRT). Background technique [0002] TRT is a blast furnace top gas energy recovery turbine power generation device. It is an auxiliary equipment of the blast furnace. The power source of the TRT device is blast furnace gas. The flow rate of blast furnace gas is very large and the pressure is very low; such as 2500M 3 For blast furnaces, the gas flow rate is usually 400,000 to 450,000 M 3 / h, while the gas pressure is only about 0.1-0.18MPa, and it is unstable; the pressure on the top of the blast furnace fluctuates at any time, and the gas flow rate also changes at any time, which is very different from the small flow and high pressure turbogenerator. Th...
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IPC IPC(8): H02J3/42
Inventor 朱罡孙鸿声
Owner XIAN SHAANGU POWER