Guizhou Power Grid: The installed capacity of clean energy has reached 47.35% of the total installed capacity

Recently, it was learned from the Scientific Research Institute of Guizhou Power Grid Company of China Southern Power Grid that the total amount of clean energy power generation in Guizhou Province in 2018 was 86.324 billion kWh, accounting for 40.78% of the province's total coordinated power generation, an increase of 0.63 percentage points year-on-year. At the same time, the utilization rate of hydropower increased by 5.38% in 2018, 2.38 percentage points higher than the plan, with a total water saving and increased power generation of 1.964 billion kWh, and no water, wind or solar power abandonment occurred due to the responsibility of the grid dispatching.

"Guizhou's clean energy consumption faces common national problems such as uncontrollable power generation and anti-regulation, as well as individual problems such as icing on wind turbine blades caused by Guizhou's unique mountainous geographical and climatic conditions, and power quality caused by the access of clean energy to regional power grids. The large-scale access of clean energy has brought great pressure on the safe and stable operation of the power grid," said Wen Xiankui, deputy chief engineer of the Scientific Research Institute of Guizhou Power Grid Company.

In 2013, Guizhou Power Grid Company planned ahead and undertook the National Science and Technology Support Program project "Research and Application of Key Technologies for Operation and Control of Large-scale Small Hydropower Groups and Wind, Solar and Thermal Power Generation". The project carried out research on the entire process of power production, including planning, power forecasting, dispatching control, and complete stability prediction. It developed related devices and systems for analysis and prediction of power generation characteristics of wind, solar and large-scale small hydropower groups in mountainous areas, risk-constrained multi-energy and multi-voltage level distributed access assessment, rapid regulation of small hydropower stations, and optimized dispatching and safe and stable control of multi-energy distributed access systems.

The research results have been widely applied in the provincial and local dispatching and station-side of Guizhou Province, collecting information on more than 1,300 small hydropower, wind power and photovoltaic power generation, and the power prediction accuracy of wind farms and small hydropower groups is above 95.58% and 90.93% respectively. In the five small hydropower stations in Liupanshui area, a "virtual small hydropower group" was built and the regulation capacity of the system was increased by 287 megawatts; the voltage qualification rate of the reactive coordination control demonstration point composed of the 220 kV Hezhang transformer, 110 kV Kele transformer and Dajiucaiping wind farm in Bijie area was increased from less than 80% to more than 95%.

At the same time, through the joint operation and control of large-scale small hydropower groups and other energy generation, the multi-level joint energy complementary operation of provincial power grids, regional power grids, power plants and substations has been realized. In 2018, Guizhou's coordinated clean energy installed capacity has reached 47.35% of the total installed capacity. The energy production structure has further shifted to clean energy. Green mountains and clear waters are being transformed into gold and silver mountains. More clean energy consumption will make Guizhou greener.