A Piecewise Linearized Optimal Power Flow Calculation Method for Electric-Pneumatic Coupled Systems
A piecewise linearization and optimal power flow technology, applied in the direction of AC networks with the same frequency from different sources, can solve problems such as inaccurate optimal power flow calculation results, to ensure safety, ensure technical accuracy, and improve calculation efficiency effect
Active Publication Date: 2021-04-20
CHONGQING UNIV
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The traditional piecewise linearization method of the optimal power flow of the electric-pneumatic coupled system relies on the selection of the initial operating point of the system. If the initial value is not selected properly, it is easy to cause inaccurate calculation results of the optimal power flow.
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[0045] A piecewise linearized optimal power flow calculation method for electric-pneumatic coupled systems, refer to figure 1 shown, including the following steps:
[0046] Step 1: Obtain the basic parameters of circuit components and natural gas network components in the electric-pneumatic coupling system, including parameters of units, electric loads and branch circuits in the power system, and parameters of gas sources, pipelines, compressors and gas loads in the natural gas network;
[0047] Step 2: According to the fuel cost linear segment number N e , using the piecewise linearization method to transform the nonlinear original function of the fuel cost of the thermal power unit with respect to the unit output into a sum of a series of piecewise linear functions, thereby transforming the nonlinear function of the fuel cost of the thermal power unit with respect to the unit output into a linear function ;
[0048] Step 3: Linear segment number L according to the node pre...
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The invention discloses a piecewise linearized optimal power flow calculation method for an electric-pneumatic coupling system: step 1: obtaining basic parameters of circuit components and natural gas network components in the electric-pneumatic coupling system; step 2: linearly segmenting according to fuel costs Number N e , using the piecewise linearization method to transform the nonlinear original function of the fuel cost of the thermal power unit with respect to the unit output into a linear function; Step 3: According to the node pressure of the natural gas network, the linear segment number L seg , using the piecewise linearization method to transform the nonlinear original function of the natural gas network pipeline flow with respect to the node pressure into a convex linear combination form; Step 4: Establish the optimal power flow model of the electric-pneumatic coupling system based on mixed integer linear programming; Step 5 : Using linear programming to solve the optimal power flow model. The invention can transform the non-convex nonlinear problem into a convex linear problem, solve it by linear programming, improve the calculation speed, ensure the safety of the power grid and the natural gas network, and realize the overall optimal economic operation.
Description
technical field [0001] The invention belongs to the field of optimal power flow calculation of an electric-pneumatic coupling system, and in particular relates to a piecewise linearized optimal power flow calculation method of an electric-pneumatic coupling system. Background technique [0002] Optimal Power Flow (Optimal Power Flow) is an important tool for system operation and planning. Traditional OPF generally only conducts optimization analysis on power systems without considering multi-energy coupling links. The electric-gas coupling system uses the gas generator as the coupling element. With the continuous increase of the installed capacity of the gas generator, it is no longer possible to ignore the influence of the operating state of the natural gas network when analyzing the optimal power flow of the power system. Therefore, in actual engineering, the effective solution and analysis of the optimal power flow of the electric-pneumatic coupling system is of great sig...
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IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 胡博谢开贵阮航曹茂森谌伟李东阳
Owner CHONGQING UNIV