| With the development of social economy of our country,the scale of new energy increase gradually,the power system load grows rapidly,and at the same time the peak-valley difference of the power system is more and more large,the problem of peak modulation is increasingly serious.As the scale of renewable energy grid is developing,flexibility and controllable variation is worse.As the new energy developing rapidly these days,the coal-fired thermal power units are not enough to cover the problem,new kinds of power units are badly needed to solve the peak modulation problem.At present,the most common units of peak modulation are load-varying of the coal-fired thermal power units and the gas-fired thermal power units in our country,which has a little amount of the pumped storage units and hydro power units;However,the most common units of peak modulation abroad are the high-capacity pumped storage units and hydro power units.The scale of high-capacity coal-fired thermal power units is large while the scale of gas-fired thermal power units is small.At first,this paper talks about economy and technology of the coal-fired thermal power units,the gas-fired thermal power units and the pumped storage units,analyses the advantages and disadvantages of the peak modulation of the three power units.Then it establishes a optimal environmental model and a optimal economic model.In first model,it transforms the environmental benefits into environmental expenses and establish the optimal environmental model.In the second model,it takes the environment effects into the economic benefit,this optimal economic model is a model which considers environmental expenses.What's more,the second model raises a new way of peak modulation in the rush-load hour.It means the units quote at first,and then the grid matches.At last,this paper makes the calculation case analysis based on a specific units and load data of an area and verify the effectiveness of the models. |
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