Simulation test method of field isolated network and system thereof

Abstract

The invention discloses a simulation test method of a field isolated network. The method comprises the following steps: (1) respectively accessing a main servomotor travel of a water-turbine generator set, output voltage of a generator end, volute pressure, a set frequency signal and power into a hydrogovernor and a set synchronous test system; (2) operating the water-turbine generator set and a main network in parallel, the load carried by the water-turbine generator set is stable, the frequency signal of a field governor is input and switched by a frequency output signal of an online isolated network simulator; (3) setting different PID (proportion integration differentiation) parameters of the field governor; (4) simulating the load change of the isolated network by the online isolated network simulator, and recording the waveform when the step quantity of the load change is +/-10%, and (5) selecting a group of parameters with the better frequency adjusting stability and speediness of the water-turbine generator set as operation parameters of the isolated network. The invention also discloses a testing system for implementing the method. According to the invention, a real isolated network operation field test can be replaced; the time and labor are saved; the testing condition of the isolated network is met; the frequency adjusting stability of the water-turbine generator set is guaranteed, and the security of each piece of power equipment is guaranteed.

Description

technical field [0001] The present invention relates to the field of electric power systems, in particular to an isolated grid simulation test method applied to on-site tests. The on-site isolated grid test is carried out through an online isolated grid simulator, and the governor parameters during isolated grid operation are provided for hydroelectric units participating in black start. The optimization scheme ensures the stability of the frequency regulation of the hydroelectric unit and the safety of the electric equipment; in addition, it also involves a system for realizing the above method. Background technique [0002] Isolated grid is the abbreviation of isolated grid, which generally refers to a small-capacity grid separated from a large grid. A power grid whose maximum stand-alone capacity is less than 8% of the total capacity of the power grid can be called a large power grid, while a power grid with a machine-to-grid capacity ratio greater than 8% is collectively...

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Problems solved by technology

However, there are large differences in operating parameters between the power equipment in the real power plant and the corresponding mathematical models, and there are continuous improvements in the power equipment during operation. If the mathematical model is not corrected in time , the results

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