電力系統(tǒng)擴(kuò)展頻率響應(yīng)模型及綜合程序研發(fā)
[Abstract]:In recent years, the frequency crashes caused by the large frequency shift of the power system and the large blackout at home and abroad are increasing. With the large-scale renewable energy access to the power system, the frequency offset of the power system will become greater when the power system is connected to the power system, and the frequency offset is beyond the power system permission. In the range, the probability of the cascading failure of the power system is greatly increased because of the frequency offset, and the frequency collapse may even occur in serious cases. Most of the researches on the frequency are based on the frequency response curve, and the full time domain simulation model and the simplified frequency response model are the most effective ways to obtain the frequency response of the power system. But the simplified model does not take into account the interaction between the frequency and the dynamic characteristics of the boiler / auxiliary equipment. Because there are a large number of auxiliary equipment in the thermal power plant, its output is closely related to the frequency, and the output of the auxiliary machine will affect the generator's output. Therefore, the power system is better described in a large frequency range migration. The frequency response characteristic of the system needs to set up a frequency response expansion model considering the effect of frequency offset on the boiler / auxiliary engine. With the continuous expansion of the system scale, the time required for the whole time domain is gradually unable to meet the demand for rapid solution. Therefore, it is necessary to ensure that the model can be fast through the simplified model in the range of the acceptable precision. The frequency response curve of the power system is solved. The full time domain simulation has been widely used in many commercial software, but there is still a lack of the software package for the simplified model frequency response calculation. Therefore, the development of a comprehensive software package for the frequency response calculation of the power system is very important for the study of the safety and stability of frequency and the emergency control. The main contents of this paper are as follows: firstly, based on the characteristics and dynamic behavior of the boiler, steam turbine speed control system, generator rotor equation and power plant auxiliary machine (feed water pump), a frequency response extended mode considering the effect of frequency offset on boiler / auxiliary engine is established. The model takes into account the boiler drum pressure and the main steam pressure. The control system, the coordination control system of the "furnace heel machine" and the regulation process of the main steam flow and feed water flow rate of the feed pump. This paper studies the corresponding relation of the parameters in the model. By analyzing the actual running data and fitting the data, the mathematical connection between the parameters in the extended model is established. Secondly, the extended mode of the system frequency response is studied. The influence of the type on the frequency stability of the system. Through the expansion model, the frequency stability of the system is analyzed in the case of the influence of frequency on the auxiliary engine (feed water pump). In the extended model, the water flow is the main control quantity, the input of the boiler fuel is controlled by the effect of frequency on the water flow, and then the output of the generator is controlled indirectly. The purpose of power is to describe the frequency characteristics of the system when a large frequency shift occurs in a power system. Then, in order to further analyze the static characteristics of the system frequency, the frequency response expansion model described above is the research object. By applying the fixed load sudden increase disturbance, the next power frequency operation point is simulated and repeated. The above steps finally get the static power frequency characteristic curve of the generator set in a larger frequency range. Based on the static power frequency curve obtained, the static stable operation region and the stable region boundary are put forward, and the static stability analysis and transient stability analysis are carried out, and the "frequency instability" leveling is further discovered and proposed. In the end, full time domain simulation has more mature commercial software and has been widely used. However, there is still a lack of software support for frequency response computing packages based on simplified methods. Developing a software package that covers these simplified models can greatly increase the systematicness and flexibility of frequency dynamic analysis. The software package program uses the common advanced language (Python) and compiler, the program structure has the modular structure. The application of the program application interface can better reflect the features of the programmability and openness of the software package. The program application interface can not only realize the basic program function, but also realize the more complex advanced application. The application of the program application interface is realized. Functional and advanced applications include frequency response calculation, low frequency load shedding, frequency safety assessment and critical load shedding.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM712;TP311.52
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