Model of Optimal Load Control for Electric Power Stations in a Hydrothermal Power System on the Basis of Maximization Profit Criteria

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Abstract
In this paper, a universal method has been developed, which is a combination of an optimization method and a method for assessing the marginal utility. Using this method, it is reasonable to solve the problem of controlling operating conditions of a water utilization system (WUS). For this purpose, it is proposed to use the water balance as the basis for the investigation and distinguish mutually complementary and mutually exclusive branches among all the WUS participants. At present, the problem of optimal load distribution in the power system between HPP and thermal power plants (TPP) is solved on the basis of the equality of the differential incremental rate characteristics of fuel consumption at TPPs and water consumption at the HPP with the use of the Lagrangian multiplier method. In this case, the number of iterations can be five or more. The proposed approach is based, first of all, on the correct representation of the differential characteristics and calculation of a hydro resource price in order to provide the operational control of the HPP. Based on the comparison of water volume at the HPP and fuel amount at TPPs used for generation of 1 kW power, it is possible to determine a water price for the HPP. Using the example of the Novosibirsk WUS, it is expected to develop an estimation of economic effect from the implementation of the developed criteria and the proposed method of hydro resource price determination for the WUS and the HPP as a basic infrastructure industry.

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