Abstract
With the rapid development of renewable generators such as distributed photovoltaic and profound changes of the power structure, this paper analyzes the frequency characteristics of the power system with high penetration of renewable generations in the process of low-frequency load shedding and discusses the influence of the distributed renewable generator frequency endurance capabilities on the implementation effect of low-frequency load shedding in detail. Finally, the influences of the distributed renewable generator frequency endurance capability and the capacities of the distributed renewable generator on frequency response characteristics of an actual Hunan power grid are simulated. The simulation results show that more distributed photovoltaic capacity without frequency endurance capability leads to deeper frequency drops after the disturbance and requires more basic rounds of load shedding. When the penetration rate of distributed photovoltaic is too high, it may cause load shedding, resulting in power grid load losses and, at the same time, leading to an overshoot phenomenon in the process of frequency recovery. Therefore, the influence of distributed photovoltaic on the control of low-frequency load shedding should be considered when designing low-frequency load shedding schemes for the power grid with high penetration of distributed photovoltaic.
Highlights
Introduction of the Distributed PhotovoltaicGeneration in Hunan Power GridIn recent years, with the progress of photovoltaic generation technology, the decrease of cost, and the support of relevant national policies, the distributed photovoltaic generation in Hunan province presents a high-speed development trend of “multiple points, wide range, and local high-density grid integration.” By May 2020, there are 506 distributed photovoltaic generation systems with a capacity of 2.16 MW inHunan Province, of which 148 systems with a capacity of 1.36 MW are connected with 10 kV or higher voltage level power grids
E contributions of this paper are summarized as follows: (1) this paper analyzes the frequency endurance capacity of the distributed photovoltaic generation in Hunan Province and its influences on the frequency response characteristic of the power system; (2) this paper analyzes the influence of the frequency endurance capability of the distributed photovoltaic generation on the low-frequency load shedding in Hunan power grid; and (3) this paper improves the traditional low-frequency load shedding scheme to increase its adaptability, which can provide a reference for frequency stability control in areas with a high proportion of hydropower
When the frequency is higher than 50.2 Hz, the distributed generation should have the ability to reduce the active power output, and the actual operation can be decided by the power grid dispatching organization; at this time, the distributed generation in the outage state is not allowed to be integrated into the power grid e power transmission to the grid line will be terminated immediately, and the grid integration of distributed generation in the shutdown state is not allowed
Summary
Analysis of the Influence of Renewable Generator Frequency Endurance Capability on Low-Frequency Load Shedding: A Hunan Case Study. According to the characteristics of different proportions of thermal power in different operation modes of the power grid in flood season and dry season and combined with the influence of hydropower on power grid frequency, this paper improves the traditional lowfrequency load shedding scheme to increase its adaptability. E contributions of this paper are summarized as follows: (1) this paper analyzes the frequency endurance capacity of the distributed photovoltaic generation in Hunan Province and its influences on the frequency response characteristic of the power system; (2) this paper analyzes the influence of the frequency endurance capability of the distributed photovoltaic generation on the low-frequency load shedding in Hunan power grid; and (3) this paper improves the traditional low-frequency load shedding scheme to increase its adaptability, which can provide a reference for frequency stability control in areas with a high proportion of hydropower.
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