Opf Model And Linear Programming Algorithm For "Source-Grid-Load" Interactive Optimal Regulation

Flexible load has increasingly becoming an important means of regulating the power grid and consuming new energy, as well as an important part of "source-grid-load" coordination control. On the other hand, nowadays typical new energy resources such as wind and solar energy are being accessed to the power grid in a large scale, but the phenomenon of abandoning wind or solar energy is very serious since the effect of channel bottlenecks or little load consumption. Aiming at solving this problem, this paper gives the OPF model and linear programming algorithm for the "source-grid-load" interactive optimal regulation. The main content of this paper includes the following aspects.(l)The adjustable and interruptible characteristics of flexible load have been researched, and the adjustable/interruptible model has been established according to the parameters of adjustable/interruptible capacity, time and speed. The output characteristics of large-scale new energy like wind power have been researched, as well as the regulation depth, regulation speed and characteristics of high speed starting and stopping of conventional power like thermal power and hydropower. Which provide the basis for further studying of the "source-grid-load" interactive optimal regulation.(2)Combining with the possibility of adjusting load flexibly because of the loose electricity price in the new situation of Chinese electric power reform, this paper gives the OPF model for the "source-grid-load" interactive optimal regulation based on the traditional OPF model. To be precise, this model puts forward the goal of maximizing the system-wide social net marginal benefit, which is on the basic of any time section with balanced power flow in the system, and considers the marginal cost of the source and network side as well as the net marginal benefit of the load side, then the basic expressions of constraint conditions have been established. Thereafter, the DC power flow model and linear algorithm are derived.(3)With the STYRP1.10 linear programming software package, the proposed model and algorithm are programmed and achieved. The IEEE-5 example is simulated under the goal of maximizing the social net marginal benefit, and the results show the effectiveness of the model and algorithm. And the influence to OPF results of changing load and generation node weight is analyzed.(4)Applied the model and arithmetic to a grid with several hundred nodes to calculate the OPF results, and the results can be referred to engineering applications. On the one hand, the scheduling decision can meet the security, economy, reliability and other operational requirements of the power system. On the other hand, the regulation value of the "source-grid-load" interaction which participated with flexible load can be fully reflected. In a word, this paper provides new ideas of OPF for future "relatively independent" power dispatching/trading platform, which has a certain application value.