Abstract
Subsequent commutation failures (CFs) in HVDC systems will cause large-scale power flow transfer in AC/DC transmission systems and lead to overload risk in HVAC systems. In order to cope with these effects, a power coordination control strategy for the AC/DC transmission system with high-proportion wind power is proposed. Firstly, a model of the AC/DC transmission system considering the large-scale wind farms access is established by analyzing the power transmission characteristics of the AC/DC transmission system with high-proportion wind power, and the power transmission characteristics are analyzed after subsequent CFs. Secondly, the HVDC subsequent CFs can be mitigated by adjusting DC power transmission, while the active power output of the sending-end AC system is reduced by active control of wind turbine generators (WTGs) to reduce the overload risk of the HVAC system. Finally, the proposed power coordination control strategy is simulated and verified based on the established simulation model and actual power grid, and the results show that this strategy can effectively mitigate HVDC’s subsequent CFs and reduce the overload risk in HVAC systems.
Highlights
The construction of wind power base and thermal power base in China overlap highly in the regional distribution and are far away from the load center, so the power generation mode of concentrated delivery of high-proportion wind power and traditional thermal power is widely used
An HVDC system is often combined with an high-voltage alternating current (HVAC) system to form an AC/DC transmission system in an actual power grid, so the active power will drop severely if the method of reference [15] is adopted; a commutation failures (CFs) will occur in the HVDC system, and the phenomenon of power shock will occur in the HVAC system
The HVDC system cannot recover to the normal power transmission capacity in time, so the HVAC system is in an overload state for a long time [16]
Summary
The construction of wind power base and thermal power base in China overlap highly in the regional distribution and are far away from the load center, so the power generation mode of concentrated delivery of high-proportion wind power and traditional thermal power is widely used. The authors of [15] adjusted the active power of HVDC systems according to the risk prediction results of subsequent CFs, so as to reduce the reactive power demand in the process of HVDC recovery, which can effectively mitigate HVDC’s subsequent CFs. an HVDC system is often combined with an HVAC system to form an AC/DC transmission system in an actual power grid, so the active power will drop severely if the method of reference [15] is adopted; a CF will occur in the HVDC system, and the phenomenon of power shock will occur in the HVAC system. The problem of large-scale power flow transfer may be solved by reducing the active power output of the sending-end AC system in the AC/DC transmission system with high-proportion wind power, for which two methods of its solution can be adopted: generator shedding or thermal power unit frequency modulation. The AC/DC transmission system with highproportion wind power was built on a simulation platform, and the proposed control strategy was verified by the simulation model and the actual power grid, respectively
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