Self-adaptive Frequency Cooperative Control Technology and its Application for Power Grid

Abstract

With the increasing scale of renewable energy, the frequency problem of renewable energy high-permeability outgoing grid is becoming more prominent. The traditional cooperative control system can no longer meet the needs of the overall perception of the renewable energy frequency changes, and the traditional emergency control strategy of cutting feed line and generator is difficult to apply. In order to take into account the frequency stability problem and operation economy of renewable energy high-permeability transmission grid, the existing renewable energy is actively involved in the frequency regulation of the system to alleviate the difficulty of frequency regulation of renewable energy high permeability transmission grid. The scheme of “active inertia support of renewable energy sources, coordinated control of renewable energy stations, self-adaptive control of power grid” is proposed. A new cooperative control system suitable for renewable energy high-permeability power grid is studied to realize the real-time state monitoring of renewable energy frequency change and the adaptive switching of control strategy. The experiment verifies the collaborative control system proposed in this paper. Through the power down-regulation test of renewable energy stations, the results show that the control system can respond to power changes in a timely manner, control the regulation time at about milliseconds, and control error is in a small range, which verifies the effectiveness of the collaborative control system.