| The long-distance and cross-regional transmission of natural gas and electricity is an important foundation and key support for tapping the complementary advantages of energy in different regions and realizing the optimal allocation of energy.In particular,with the increase in installed capacity of gas-fired units and the application of Power to-Gas(P2G),the degree of coupling between power system and gas system has become increasingly deep.The Integrated Electricity-Gas Energy System(IEGES)can promote the consumption level of renewable energy and improve the efficiency of energy utilization,but the complexity of the integrated system also makes its operation and regulation facing difficulties and challenges.In this regard,based on the operation and control model of IEGES,this paper takes wind power consumption improvement and incomplete scheduling information as prerequisites to study the centralized and distributed coordination and control theories of cross-regional IEGES.The main research contents and results are summarized as follows:(1)From the inter-regional and intra-regional levels,the basic model of IEGES operation and control was established,including three parts:power system,natural gas system and coupling system.The power system model includes the traditional AC power flow model and the stepped power transmission model of the DC.The natural gas system model is based on the Panhandle model,and including the line pack model and compression station model.At the coupling level,the gas-fired unit model that converts gas to electricity and the P2G model that converts electricity to gas are established.(2)Based on long-distance DC transmission,and considering the conversion and indirect storage functions of P2G and line pack,a cross-regional IEGES centralized coordinated control method for wind power consumption is proposed.The problem of the mismatch between the DC transmission plan and the output of wind power and the slow nature of natural gas are addressed by adjusting the planning sequence,reasonably selecting the control step size,and introducing virtual nodes.The cost of abandonment penalty is introduced into the centralized day-ahead optimization control model aimed at the optimal overall operating economy of IEGES,and the linearized AC power flow algorithm and the piecewise linearization method are used for the linearization of the model.Finally,the results of the calculation examples show that the proposed method has significant effects in improving the flexibility of the system and promoting wind power consumption.(3)Aiming at the problem of information privacy between different regions,a cross-regional IEGES distributed coordination control method under the condition of incomplete information is proposed.Combining the two types of cross-regional coordination,the incomplete information conditions are explained.A global consistency framework is constructed based on the Alternating Direction Method of Multipliers(ADMM),and the boundary replication method is used to decompose different energy regions.The distributed day-ahead optimization regulation model is established according to different regions,with wind curtailment penalty cost and reasonable system parameters are used to avoid the impact of inter-regional energy transaction costs on regulation.Convergence speed of the algorithm is accelerated through linearization and the update method of variable penalty coefficients.Finally,the feasibility and effectiveness of the proposed method are verified by several simulation results. |
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