Strategies for relieving ramp pressure of thermal power units with high-proportion photovoltaic power connecting to the grid

doi:10.3969/j.issn.2097-0706.2022.01.001

Abstract

Abstract:

It is of great significance to study the strategy for relieving ramp pressure of thermal power units with high proportion photovoltaic power connecting to the grid for improving the level of photovoltaic power consumption and stabilizing the operation of thermal power units.Analyzing the security and stability of the grid with high-proportion photovoltaic power,a "source-grid-storage" coordination and optimization model for photovoltaic power,thermal power,DC modulation and energy storage system is constructed.The model makes full use of the time-shifting characteristics of energy storage systems and the fast response of DC modulation to consume grid connected photovoltaic power.The proposed model is simulated on an improved IEEE-24 bus system,and the simulation results verify the superiority and effectiveness of the proposed strategy.This strategy can effectively alleviate the ramp pressure of thermal power units,improve the photovoltaic capacity and ensure the safe and effective operation of the power grid with a reduced system operation cost.

Key words: photovoltaic consumption, DC modulation, energy storage system, thermal power unit ramp rate, net load curve, high-proportion PV power grid connection, "source-grid-storage" coordination

CLC Number:

TK01

ZHANG Xingke, WEI Chaoyang, WANG Kangping, TIAN Hao, MIAO Pengfei, ZHOU Xia, WEI Cong. Strategies for relieving ramp pressure of thermal power units with high-proportion photovoltaic power connecting to the grid[J]. Integrated Intelligent Energy, 2022, 44(1): 1-8.

Figures/Tables 11

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节点	最小出力/MW	最大出力/MW	成本/[美元·(MW·h)^-1]
^#1	62.4	192	19.10
^#2	62.4	192	19.10
^#7	75.0	300	37.00
^#13	207.0	519	32.00
^#14	54.3	155	16.53
^#15	66.3	215	16.53
^#22	60.0	300	15.20