In the face of the increasing proportion of intermittent renewable energy in the power system, what will be affected by the traditional hydroelectric generating units that are responsible for the regulation of the power grid, and how should we deal with it? Recently, Nature Communications published the water conservancy online. Professor Yang Jiandong from the School of Hydropower, research progress on this issue.
The paper is entitled Burden on hydropower units for short-term balancing of renewable power systems. The study is a team of Professor Yang Jiandong and the University of Uppsala, Sweden. The power company Vattenfall, the relevant team of Oak Ridge National Laboratory in the United States completed the cooperation. The first author of the paper is Wuhan University, the first author and correspondent is Yang Weijia, associate researcher.
At present, how to deal with the intermittent nature of renewable energy generation such as wind energy and solar energy, and efficiently solve the problem of grid connection and consumption of renewable energy power is a hot spot in the global energy field. Hydropower units have fast load regulation rate and large adjustment range. Advantages, a number of studies have shown that reasonable hydropower regulation will be the key to ensuring the safe and stable operation of high-ratio renewable energy power systems. However, what impact will the increasing power grid regulation have on hydropower units? The unit wears parts frequently involved in power grid frequency modulation, and the mechanism of power generation efficiency loss is not clear. The corresponding power market compensation mechanism needs to be further studied. In addition, the research on optimal dispatching and economic operation of generator sets is usually carried out from medium and long-term levels, while small time There are few reports on scale (seconds).
This study addresses the two aspects of the balance between the burden and regulation performance of hydropower units in primary frequency regulation of power grids. Based on the second-order time scale, a quantitative evaluation framework (Framework) combining the technical characteristics and economic indicators of power plants is proposed. The study studies the efficiency loss, component wear, adjustment mileage and frequency quality in the frequency modulation process of the unit. The mathematical model of the hydro-mechanical-electric coupling hydroelectric system with axial flow rotary double adjustment turbine is established. Various operating conditions and 'burden reduction' operating strategies were evaluated.
Based on the adjustment mechanism of the relevant generator sets in China, Switzerland and the United States, this study expands and compares the three methods of frequency compensation (Mileage), strength (Strength) and contribution (Contribution). Using the framework and model, the personnel explored the evolution of the frequency regulation of the hydropower unit and the economic compensation in the future high-power volatility, low inertia, and weak damping of the renewable energy power system.
The framework and model proposed in this study can be used as an effective analysis tool for power generation enterprises to obtain favorable unit operation strategies to reduce losses and increase compensation benefits. It can be used by grid companies and transmission system operators to deeply analyze the actual regulation performance of the unit. The relationship between compensation and incentive mechanisms. Finally, the paper also mentioned that it is hoped that hydropower regulation research will attract more attention from all walks of life and more people to participate, and provide guarantee for the efficient operation of renewable energy power systems.
