Device for monitoring leading phase operation stability of generator and working method thereof

Abstract

The invention discloses a device for monitoring the leading phase operation stability of a generator and a working method thereof. The device comprises a Beidou satellite system module, a power angle measuring module, a parameter recognizing module, an interface converter module, a display module, and the like. The method comprises the following steps of: firstly, receiving a clock signal emittedby the Beidou satellite system and acquiring current reliable parameter time; recognizing system interconnection impedance; solving the leading phase capacity of each unit by the voltage target valueand the practical measuring value of an electric power plant, comparing the leading phase capacity of each unit with practically-measured passive power, measuring a difference value by the power angle measuring module and controlling excitation action; calculating a power angle of the generator by utilizing an exciting current and further acquiring a power angle of the generator to the system; and calculating the static stability margin of the current leading phase operation, monitoring the stability of the system and outputting an adjustment signal, a fault signal, and the like by the interface converter module. If the limit value of the generator is out of limit, the passive power of a corresponding unit is immediately regulated until in a suitable range. The invention is safe and reliable and has higher relative accuracy and convenience in practical application.

Description

technical field [0001] The invention relates to a monitoring device and a working method for the stability of generator phase-advance operation, and belongs to the technical field of power system stability analysis. Background technique [0002] With the increasing scale of the power system, higher requirements are put forward for the monitoring and control of the safe and stable operation of the power system. Due to the large number of equipment and wide area of ​​the power system, and its operating variables change very rapidly, obtaining the operating status information of the key points of the system must rely on the same, high-precision reference time. Therefore, the time synchronization of safe, reliable and high-precision clocks has become a basic requirement for the operation of contemporary power grids and even future smart grids. Most of the Phase Measurement Units (PMUs) currently in operation use the Global Positioning System (GPS) as a synchronization reference...

AI Technical Summary

Problems solved by technology

Most of the Phase Measurement Units (PMUs) currently in operation use the Global Positioning System (GPS) as a synchronization reference, and their reliability depends on the availability and accuracy of GPS. Compared with the safety and stability of the power system In terms of control, the GPS signal is slightly insufficient in the following aspects: ①The long-term stability of the time signal output by the GPS receiver is good, but the short-term stability is poor; ②The anti-jamming performance of the GPS receiver is poor, and the satellite may lose lock; ③The satellite Test or debugging may cause GPS clock jump

There are two main types of existing power angle measurement: one is the direct measurement method, which uses the rotor position signal instead of the no-load potential of the generator for phase comparison, and requires the use of non-electrical sensors to achieve measurement, but this type of method generally has the following defects : ① It is necessary to modify the generator itself, the process is complicated and the application is difficult; ② The detection accuracy is low and the error is large; ③ The environment requirements are high, etc.

This kind of method can calculate the power angle more accurately when the system is running in a steady state and the parameters of the generator are more accurate, but the calculation error is larger in the transient process of the system

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