X. F. JIANG ET AL. 609
Engineering hub mainly consists by three big building
supper reservoir, water power generation system and
lower reservoir, which installing four 300 MW each re-
versible hydraulic pump unit, gross installed capacity is
1200 MW. It is designed to generate peak power, 1.606
billion kW·h, and to consume 2.141 billion kW·h by
pumping each year.
4. The Scheduling Strategy of Pumped
Storage Power Plant
4.1. Considering the Basic Idea of Pumped
Storage Power Plant Grid Dispatching Mod-
el
The basic idea of the scheduling model is: start from the
whole power system and the reality, fully consider of the
technical and economic characteristics of all kinds of
power station in the system[4] (including hydropower
and thermal power, nuclear power and pumped storage
power station, etc.) and relevant operation system con-
straints under the situation that the load, the installed
capacity of power station and hydropower station’s hy-
drological data known. Arrange the working position and
capacity of each power station in system typical day
(week) month after month in load curves; make full use
of hydropower, to reduce the system conventional ther-
mal power unit boot capacity. Make work position and
work capacity of pumped storage, thermal power, nuclear
power stations and their start-stop by economical effi-
ciency, to meet operation system load demand on the
best ways.
The goal is to make the entire units operation cost
minimum in the system, and also to make the conven-
tional thermal power unit capacity and the electricity
generation least, to achieve the purpose of section coal.
Operation simulation calculation process and proce-
dure roughly as follows:
1) Look for the work position of hydropower, accord-
ing to the adjustable output and expected power in hy-
drological years,
2) Get the work position pumped storage power plant,
3) Calculate the generation process, storage capacity,
electricity and operation cost, etc., according to the work
position.
4.2. The Mathematics Model of the Pumped
Storage Power Station’s Scheduling
Planning
4.2.1. The Objective Function
The objective function of operation simulation of pumped
storage power plant is the minimized operation cost in
research period
1
min ()
T
tt t
t
CFR
D (1)
C: the total cost of operation every week in the system,
ten thousand;
t
is the fixed operation cost at t period in the system;
t is the fuel cost at t period in the system; t is the
variable cost at t period in the system, including the start-
stop losses and the operation cost of the hydropower and
pumped-storage units, ten thousand; T is the number of
operation cycle time, this paper take T = 168 h.
R D
Hydropower units with no coal consumption, so fuel
costs can be neglected[5]; the pumped-storage units re-
place other units to generate power in power generation
condition, its power benefit is the operating costs of the
replaced units, when the pumped-storage unit in pumping
condition, the pumping cost equals the increased supply
of pumping thermal power unit of power operation costs.
So the objective function for the plan is practical calcula-
tion and pumped storage power station in valley of
pumping after thermal power unit system operation cost
and the pumped-storage unit to substitute other unit’s
load the fixed cost saving the minimum sum.
4.2.2. Constra i nt Con d i tion
a) The related constraints of pumped storage
1) Pumped storage capacity constraints
Power generation capacity constraint
,max
0()
gg
Pt P
(2)
Pumping capacity constraint
,max
0()
pu pu
Pt P
(3)
Without other restrictions, to make full use of the unit
capacity, generally think,maxg, equal to the
pumped storage power plant capacity.
P,maxpu
P
2) Power balance constraints
Under the restricted constraints ①, get week pumping
power:
7 168
11
() ()
pu
it
Epu iPt
(4)
The biggest generating capacity constraints on i day:
1
11
0()() (
ii
Eg iEpuiEgi
)
(5)
Eg (0) = 0.
3) Capacity constraints
Set pumped storage power station as a reference for
processing agricultural products on power C, then
max(( ))Es iC (6)
4) Work position constraints
To avoid the position overlap of pumped storage posi-
tion and generation position, it must satisfy the follow:
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