JPS6343529A - Load regulating controller of hydro-electric power station - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a load adjustment control device for a hydroelectric power plant that limits changes in river water level due to water discharge from the power plant.

(Conventional technology) In a power plant with an environment like the one shown in Figure 6.

Normally, the water discharge gate 2 of the upper dam 1 is often closed. At the power plant 3, the water used for power generation is discharged into the river 5 through the water discharge port 4, but if the water discharge gate 2 is closed as mentioned above, the water used for power generation is discharged only from the power plant 3. The water level of River 5 will change. In such a river 5, in order to prevent anglers from being flooded due to a sudden rise in water level, it is mandatory to keep the change in river water level within a limit value. Therefore, in such a power plant 3, it is necessary to determine the rate of increase in water discharge, that is, the rate of increase in output (hereinafter referred to as load change rate), and perform power generation such that the rise in river water level is within a limit value.

FIG. 7 shows a conventional load change rate control device. Normally, the five power plants have a plurality of main engines, and the output command value P is given as the sum of the outputs of the main engines of the entire power plant. The load distribution processing unit 6 uses this output command value P.

An operating condition signal at indicating the load condition of each main engine.

..., input an and the fixed load change rate ΔPO.

For a main engine with sufficient load, the sum of the outputs of all main engines is P.
Output command values PI, ..., Pn are distributed to each machine until the following. Load adjustment control section 71. ..., 7n are the respective main engine output command values P+, ..., Pn inputted as target values, and the actual outputs 21' of each main engine.

...Input Pn / and output adjustment signals b + , "・", bn according to the deviation, p , / ,
, , , pn/ is PI.

..., performing feedback control to follow Pn.

With the above configuration, when a load request is made to the power plant and an output command value P is input, the load distribution processing section 6 issues an output command value P+ to each main engine based on this command value P.

..., Pn are calculated, but at this time, the amount of increase in these values is limited by the fixed load change rate ΔPo. That is, each of the output command values P+, .

(Problems to be Solved by the Invention) However, in the conventional method, the load change rate ΔPo is fixed to a value determined at a low water level where the water level changes rapidly when water is started to be discharged. However, as the water level of the river rises, the cross-sectional area of the river increases, and even though a higher water level would allow a larger amount of water to be discharged under the same water level change restriction condition, the discharge flow rate is limited to a small amount, and the output command value is The problem was that it was slow to follow changes, and other power plants would have to start up to meet expected peak loads.

SUMMARY OF THE INVENTION An object of the present invention is to provide a load adjustment control device for a hydroelectric power plant that maximizes the ability to follow increases in output within the permissible range of river water level changes.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a load change rate calculation processing unit that calculates a load change rate according to the shape of the river under the condition of a constant water level change, The load is distributed to each main engine based on the load change rate output from the load change rate calculation processing section.

(Function) The maximum load change rate can always be distributed to each main engine with respect to the river water level, and a load adjustment control device that can follow changes in the output command value can be obtained.

(Embodiment) FIG. 1 shows a load adjustment control device according to an embodiment of the present invention. The same parts as the conventional one are given the same reference numerals.

The load change rate calculation processing unit 8 inputs the river water level H, and calculates the current value based on the river shape characteristic f(H) and the operating unit signal C representing the load state of each main engine output from the load distribution processing unit 6. The load change rate ΔP is output to the load distribution processing section 6.

The configuration of this load change rate calculation processing unit 8 is shown in FIG. A ΔS bath processing unit 9 that calculates the cross-sectional area ΔS, a ΔS → ΔQ conversion processing unit 10 that calculates the water discharge flow rate ΔQ from this ΔS, and a P-Q of each main engine by inputting this ΔQ and the operation number signal C.
Main engine characteristic data processing unit 1 that outputs characteristic data g(Q)
1, a ΔP calculation processing unit 12 that outputs ΔP corresponding to ΔQ from this main engine characteristic data g(0), and a river water level 11 and a set rate of change ΔH, which calculates the actual increase ΔHa of the river water level 11. It consists of a ΔHa calculation processing unit 13 that stops the output of the ΔP calculation processing unit 12 when Δ11 occurs.

With the above configuration, the operation of the load adjustment control device will be explained using FIGS. 3 to 5.

FIG. 3 is a relationship diagram between the river water level 11 created based on river shape data and the river cross section Is up to the water surface. The river cross-sectional area S is a downwardly convex parabola S with respect to the river water level H =
f (H). The ΔS calculation processing unit 9 calculates the water level change rate ΔH and the increase amount ΔS in the river cross-sectional area S from the river water level H.
is calculated as Δ5=f(I++ΔH)−f(+()).

Next, the ΔS→ΔQ calculation processing unit 10 calculates the increase in flow rate ΔQ per unit time based on this ΔS and the average flow velocity of the river. Then, the ΔP calculation processing unit 12 calculates this flow rate increase ΔQ and the P-low characteristic P=
From g(Q), the load change rate ΔP is 622g(Q+ΔQ)−
Calculate as g(Q). This ΔP has a slightly different value depending on the selected main engine.

Load change rate ΔP and river water level calculated in this way! (The relationship between
It can be seen that increases monotonically. FIG. 5 shows the followability of the load change rate ΔP obtained in this way to the target actual output value.

It can be seen that the target output command value is reached Δt earlier than the conventional fixed load change rate.

Note that when the load change stop signal d is output from the ΔIla calculation processing unit 13, the load change rate ΔP output from the ΔP calculation processing unit 12 becomes OMW. This ΔHa calculation processing section 13 is
This is provided in consideration of the case where changes in the water level of the river are affected by water discharged from the water discharge gate 2 of the upper dam 1 shown in FIG. 6 or by water from sources other than the power plant, such as heavy rain. This makes it possible to keep the water level change below ΔH even under the influence of heavy rain or the like.

In the manner described above, a load adjustment control device for a hydroelectric power plant can be obtained that has good followability to changes in power generation load while always limiting changes in river water level within a certain range.

[Effects of the Invention] As described above, according to the present invention, the ability to follow output command values is greatly improved, the capacity of the power plant can be fully utilized for expected peak loads, and the power supply A load adjustment control device for a hydroelectric power plant that greatly contributes to operational aspects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a load adjustment control device according to an embodiment of the present invention. Figure 2 is a detailed block configuration diagram of the load change rate calculation processing section in Figure 1, Figure 3 is a relationship diagram between river water level and river cross-sectional area, Figure 4 is a characteristic diagram of river water level and load change rate, and Figure 5 is a diagram of the relationship between river water level and river cross-sectional area. Figure 6 is a characteristic diagram of followability to actual output, Figure 6 is a diagram of the surrounding environment of a power plant where the rate of change in river water level is limited, and Figure 7 is a configuration diagram of a conventional load adjustment control device. 1...Upper dam, 2...Water discharge gate, 3...Power plant. 4... Water outlet, 5... River, 6... Load distribution processing section, 7+, 7n... Load M adjustment control section, 8... Load change rate calculation processing section, 9... ΔS Calculation processing unit, 10...
ΔS→ΔΩ conversion processing section, 11... Main engine characteristic data processing section, 12... ΔP calculation processing section, 13... ΔHa calculation processing section. Nosagawa 1) 1. Tree (IH- Figure 3 Hot i Lake: 5 employment wood group day □ Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] In the load adjustment control device of a hydroelectric power plant, which distributes the load to each main engine at a predetermined load change rate in response to an output command value, the load change calculates the load change rate according to the shape of the river by inputting the river water level. 1. A load adjustment control device for a hydroelectric power plant, characterized in that a rate calculation processing section is provided, and load distribution is performed to each main engine based on a load change rate output from the load change rate calculation processing section.