A PMU-based multi-circuit DC emergency power modulation system and method

Abstract

The invention relates to a multi-loop direct-current emergency power modulation system and a multi-loop direct-current emergency power modulation method based on a PMU (power management unit). The modulation system comprises a sensor, a PMU device, a GPS (global positioning system), a control main station and a signal transmitter, wherein the PMU device is connected with a convertor station through the sensor, the control main station is respectively in communication connection with the PMU device and the signal transmitter, the GPS is connected with the PMU device, and the signal transmitter is connected with the convertor station. The modulation method comprises the following steps of adopting the PMU device to sample each convertor station in real time, calculating a voltage phasor value and corresponding power, outputting the phasor data, and transmitting the phasor data with a time scale to the control main station according to a clock signal of the GPS; and adopting the control main station to calculate a modulation power control signal of each loop of direct-current power transmission system, and modulating the power of each convertor station according to the modulation power control signal. Compared with the prior art, the modulation system and the modulation method have the advantages that the operation stability of a power system can be improved, and the modulation effect is good.

Description

technical field [0001] The invention relates to a power modulation system and a modulation method, in particular to a PMU-based multi-circuit direct current emergency power modulation system and method. Background technique [0002] With the development of the power system, high-voltage DC has become the main part of the electricity received by the grid, and the safe operation of the DC system is becoming more and more important to the grid. HVDC (high-voltage direct current, high-voltage direct current) has the characteristics of fast response, high controllability, large adjustment capacity, and wide spanning area, which provides a powerful means to improve the dynamic performance of the system. Since the multi-circuit DC transmission system is independently designed according to the system conditions in different periods, the exchange of operation control information and coordinated control are not considered. Therefore, after each DC transmission system is put into oper...

AI Technical Summary

Problems solved by technology

Therefore, after each DC transmission system is put into operation, the response to AC system interference may form a "separate" situation, and sometimes even weaken the dynamic performance of the original power system. It is necessary to discuss the coordination control strategy and algorithm between the DC transmission system and the AC system.

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