Method and system for improving voltage control capability of new energy station based on coordination control

Abstract

The invention discloses a method and system for improving the voltage control capability of a new energy station based on coordination control, and belongs to the technical field of power system control. The method comprises the following steps: 1, reading a voltage of a new energy station grid-connected point after a preset time interval with an initial voltage; 2, determining the variable quantity of the initial voltage of the grid-connected point of the new energy station and the voltage after a preset time interval, if the variable quantity is greater than a preset value, controlling the new energy station to enter a reactive power coordination control mode of the doubly-fed phase modifier and the SVG, and if the variable quantity is smaller than the preset value, controlling the new energy station to enter a reactive power control mode of the SVG; and 3, measuring the grid-connected point voltage after the new energy station enters the reactive power coordination control mode of the double-fed phase modifier and the SVG or the reactive power control mode of the SVG, and if the value of the grid-connected point voltage is between preset threshold values, controlling the new energy station to enter the SVG reactive power control mode. According to the invention, the voltage control capability and the short-circuit current capability of the new energy station are improved.

Description

technical field [0001] The present invention relates to the technical field of power systems, and more specifically, to a method and system for improving the voltage control capability of new energy stations based on coordinated control. Background technique [0002] In order to build a new power system with new energy as the main body, wind power and photovoltaic power generation, as the most mature and promising renewable energy power generation technologies, have maintained a strong momentum of development in recent years. By the end of 2020, the installed capacity of wind power in my country reached 281.53 million kilowatts, the installed capacity of photovoltaic power generation reached 253.43 million kilowatts, the installed capacity of new energy power generation accounted for 28.8%, and the electricity accounted for 14.1%. The largest output of new energy in Northwest Power Grid accounted for 44.38% of the total power generation output . It is estimated that by 2030,...

AI Technical Summary

Problems solved by technology

It can increase the inertia and short-circuit current capacity of new energy stations, solve the problems of insufficient short-circuit capacity and weak voltage regulation ability in new energy collection areas in the current power system, and solve the inertia and frequency regulation problems of the power system at the same time, but the double-fed condenser Compared with the same capacity SVG, the cost is high, and the economy is average

Images