Heat Pump Temperature Trajectory Planning Algorithm for Bus Voltage Sag Suppression

doi:10.11930/j.issn.1004-9649.202210013

Abstract

Abstract: The PEDF (photovoltaics, energy storage, direct current and flexibility) micro-gird can make full use of the building’s own photovoltaic energy and thermal inertia storage system. However, excessive heat pump load will lead to a serious voltage sag at the DC bus, causing a great challenge to the stable operation of the DC micro-grid system. Therefore, this paper proposes a temperature trajectory planning algorithm that can suppress transient dc bus voltage sag. Based on the heat pump’s own load management in the process of its temperature regulation, a joint model is firstly constructed to analyze the mechanism of bus voltage sag, with consideration of the temperature rise process of buildings, the cooling/heating efficiency of heat pump and the electromagnetic performance of drive motors. And then, a Chebyshev polynomial-based thermal transition strategy is proposed, which integrates the thermodynamics, human comfort and heat pump performance constraints. Finally, the gradient optimization method is introduced to solve the optimal temperature trajectory planning curve, and comparative simulation is conducted. The simulation results show that the proposed algorithm can significantly suppress the transient sag of DC bus voltage in the process of heat pump temperature regulation, which are well suited to the smooth control and improving stability of building’s DC microgrid system.

Key words: PEDF microgrid, building temperature model, bus voltage sag suppression, temperature trajectory planning, Chebyshev polynomial

ZHAO Yangyang, LIU Lan, ZHAO Wei, ZENG Shuang, LIANG Anqi, WANG Hanqiu, MA Kai. Heat Pump Temperature Trajectory Planning Algorithm for Bus Voltage Sag Suppression[J]. Electric Power, 2023, 56(5): 99-107.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202210013

https://www.electricpower.com.cn/EN/Y2023/V56/I5/99

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