Abstract
In recent years, the violation and fluctuation of system voltage has occurred with greater frequency with the integration of high-penetration distributed photovoltaic generation. In this paper, the voltage violation and fluctuation in a high-penetration distributed photovoltaic integrated system is analyzed, and then a corresponding suppression strategy is proposed. Firstly, based on solar cell and photovoltaic control system models, the influence factors of photovoltaic output are analyzed. Secondly, the voltage violation and fluctuation caused by photovoltaic integration is analyzed, and the quadratic parabola relationship between bus voltage fluctuation and photovoltaic power variation is constructed. Next, according to the virtual synchronous generator characteristic of distributed photovoltaics, a double-hierarchical suppression strategy is proposed to make full use of reactive power regulation capability, which can maintain the symmetry of power supply while meeting standard requirements. The proposed strategy can conveniently realize quick response and support the photovoltaic extensive access. Moreover, with the employment of the proposal, the system voltage violation and fluctuation can be suppressed effectively. Finally, considering the photovoltaic access location, capacity, and partial shading, the effectiveness of the proposed strategy is verified in IEEE 33-bus distribution system with field measured data. After distributed photovoltaic accesses the system, more than 60% of buses appear to have undergone bus voltage violation. With the proposed method, more than 20% of the voltage deviation and more than 6% of the voltage fluctuation are effectively suppressed so that the system voltage can be kept below 1.07 p.u. and the voltage fluctuation can be kept within 4%, meeting the requirements of power quality standards.
Highlights
In recent years, under the circumstances of global energy shortage and serious environmental damages which urgently need to be addressed, renewable energy generation has maintained a rapid development trend all over the world [1,2,3]
In terms of different proportion and partial shadow influences of distributed pho voltaic integration, the resulting voltage violation and fluctuation issue is analyzed, a double-hierarchical voltage violation and fluctuation suppression strategy is p posed in this paper
In terms of different proportion and partial shadow influences of distributed photovoltaic integration, the resulting voltage violation and fluctuation issue is analyzed, and a double-hierarchical voltage violation and fluctuation suppression strategy is proposed in this paper
Summary
Under the circumstances of global energy shortage and serious environmental damages which urgently need to be addressed, renewable energy generation has maintained a rapid development trend all over the world [1,2,3]. Considering high-penetration and partial shading affect, the voltage violation and fluctuation caused by photovoltaic integration is analyzed, and a double-hierarchical suppression strategy is proposed in this paper. The proposed strategy reduces the harmful effect of high-penetration photovoltaic integration on voltage, and deals with the voltage violation and fluctuation caused by partial shadow effectively; According to the bus voltage value, the local control hierarchy of the proposed strategy is convenient to realize a quick response, and easy to support distributed generation extensive access; By ranking the reactive power output capacity, the proposal with global control can make full use of reactive power regulation ability of photovoltaic inverters under various conditions, especially the partial shadow situation, to improve the voltage stability of the system.
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