Wind power and hydropower are the most promising renewable energy sources. The randomness and volatility of wind power make large-scale wind power acceptance an important issue in the current power system. The peaking effect of hydropower units can compensate for the randomness of wind power output. Enable hydropower plants and wind farms to deliver as planned.
According to the characteristics of the turbine, the governor parameters of the turbine are adjusted by genetic algorithm. The simulation results show that the PID after setting has better control effect than the conventional PID. The output of hydropower is very good to effectively compensate the wind power output, reduce the impact on the power grid, and is conducive to the long-term stable operation of the power grid.
With the continuous development of wind power generation, the large-scale access of wind power to the power grid has brought a huge impact on the power system. On the power generation side, an uncontrollable power source with obvious randomness and strong volatility is introduced to bring stability to the power system to maintain the power generation load. challenge. Wind power has the disadvantages of volatility and intermittentness, which has a great impact on the stable operation of the power grid and power quality, and also brings many difficulties to the development of wind farm power generation and operation plans. China has a vast territory and abundant water resources. Hydropower is also widely used as a clean energy source in China's power structure. Therefore, wind power, hydropower and cogeneration are the development direction of new energy in the future.
Utilizing the ability of hydropower to convert random wind power into a power source that can participate in the operation plan of the power system, so that the hydropower plant and the wind farm can output the power that the power system can provide according to the plan. This method is called wind farm and hydropower plant. Coordinated hydropower wind power generation (CHWG).
At present, there are many researches on combining wind power and pumped storage hydropower stations at home and abroad. Based on the maximization of cost benefits and benefits, the mathematical model of wind power and pumped storage power stations is constructed, considering constraints, combining different electricity price periods, and economics. Simulation and verification were performed from the perspective of reliability. However, in the current power system, most of the hydropower is conventional hydropower. If only the wind power is connected to the grid, the construction of the pumped storage power station does not meet the economic benefits of the system.
According to the combination of wind power and conventional hydropower stations in combination with wind power and conventional hydropower stations in the northwest and northeast, the volatility of wind power load in tracking time is reduced, and the mathematical model of feng shui joint dispatch is established to ensure economic benefits. Therefore, this paper considers the ideal conditions of feng shui co-generation in the operation of the grid, mainly to study how to improve the control accuracy and response time of hydropower units.
The current regulation of the turbine group is mainly the traditional PID control, but the traditional PID control can not quickly respond to the real-time changes of the controlled object, especially in the feng shui coordinated control can not cope with the rapid changes of wind power [18-19], therefore, this paper The genetic algorithm is used to optimize the PID parameters of the turbine to meet the requirements of the rapid preparation and adjustment of the turbine in the process of compensating for wind power.
Figure 2 Synergistic operation of Feng Shui based on genetic algorithm
Based on the background and research of feng shui cooperative operation, this paper considers the volatility and randomness of wind power, adopts the complementary power generation mode of hydropower, and uses the differential power when wind power is connected to the grid as the output power of hydropower, and adjusts the PID speed of the turbine. The control of the turbine realizes the compensation of wind turbine power to the wind turbine, and uses the genetic algorithm to evolve and adjust the conventional PID parameters of the turbine. Through simulation comparison, the conclusions are as follows:
1) Through the effective adjustment of the PID of the turbine, the output power of the hydropower can effectively follow the output power of the wind power, so as to effectively compensate the fluctuation and instability of the wind power, and finally achieve the ideal output power to achieve the synergy of Feng Shui. The purpose of power generation.
2) Through the comparison of the actual data simulation, the genetic algorithm is used to adjust the conventional PID parameters of the turbine, which can effectively improve the speed, precision, and overshoot of the turbine output power to wind power, and achieve better feng shui co-generation. the goal of.
The wind power used in this paper is the actual determined data. In the actual application process, wind speed and wind power will produce errors in the process of prediction, affecting the power compensation of hydropower follow-up and output. As a nonlinear and time-varying system, the current state of research is mostly based on a simplified ideal model. In the future research, we should also consider the above conditions to achieve better results.
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