Cooperated control strategy of generator re-dispatching and multi-HVDC modulation after ultra HVDC block

Abstract

With the increase of DC project voltage level and transmission capacity, the security and stability risk caused by DC blocking is gradually increasing. Aiming at reserve dispatch after ultra-high voltage direct current (UHVDC) block, scenarios of DC power modulation participating in dispatching are presented. Mathematical models of generator re-dispatching incorporated control of DC in AC/DC hybrid grid in three situations in terms of enough reserve capacity in the disturbed province, regional reserve capacity sufficient and insufficient to make up for the power deficiency are presented. Then, a decision-aid system for optimal reserve dispatch after UHVDC block is proposed. Simulation results of Central China power grid indicate that the proposed scheduling scheme can reduce the operation risks of security and load loss if necessary.

Keywords

• HVDC power transmission
• power grids
• power generation dispatch
• power generation scheduling
• power generation control
• power transmission control
• DC power modulation
• mathematical models
• power deficiency
• optimal reserve dispatch
• UHVDC block
• Central China power grid
• cooperated control strategy
• multiHVDC modulation
• ultra HVDC block
• transmission capacity
• stability risk
• DC blocking
• AC-DC hybrid grid