JP2645000B2 - Hydroelectric power plant load regulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention is to adjust the output of a plurality of generators installed in a hydroelectric power plant with a limited rate of change in river water level. The present invention relates to a load adjusting device for a hydroelectric power plant.

(Prior Art) In a hydroelectric power plant, water used for power generation is discharged to a river. However, in order to prevent a water shortage, a change in water level per unit time may be limited based on the River Law. In such a power plant, the rate of increase in water discharge, that is, the rate of increase in output (hereinafter, referred to as load change rate) is limited, and load change rate control is performed so that the rate of rise in river water level falls within the limit range. .

FIG. 6 shows the configuration of a conventional load adjusting device. For simplicity of explanation, it is assumed that there are two generators in the office. The total output command value a is given as an output command value for all the generators in the power plant.

The load distribution processing unit 1 includes a total output command value a, and operation states b ₁ and b ₂ representing the number of revolutions or the load state of each unit.
And distributes the input total output command value a in accordance with the load state of each unit, and outputs output command values c ₁ and c ₂ to each unit. Unit load change rate limit processing units 2A, 2B
Input the output command values c ₁ and c ₂ of each unit and the operation states b ₁ and b ₂ of each unit output from the load distribution processing unit 1 to the preset water level change rate limit value of the river water level. Based on the actual command values d ₁ and d ₂ with the rate of change limited.
Is output. Each unit load adjustment controller 3A, 3B
Are the actual command values d ₁ and d _{2 for} each unit whose rate of change is limited.
Is input and compared with the actual output values e ₁ and e _{2 of} each unit, and load adjustment signals f ₁ and f ₂ are output to each unit according to the comparison result.

With the above configuration, when the total output command value a is newly set, the load distribution processing unit 1 determines the load state of each unit based on the operating states b ₁ and b ₂ of each unit, and determines the load state of each unit. Is distributed to the total output command value a. Therefore, at this time, the sum of the output command values c ₁ and c ₂ distributed to each unit is the set total output command value a. Each unit load change rate limiting processing unit 2A, 2B is configured to output the output command values c ₁ , c ₂
For the above, a change rate limit based on the water level change rate limit value of the river water level described above is given, so that each output command value is gradually set at the limited change rate as well as the direct output target value of each generator. c _1, the actual command value reaches the c ₂ d _1, and outputs a d _2. Each unit load adjustment control unit 3A, 3B inputs the actual output values e _1, e ₂ of the actual command values d _1, d ₂ and the power generator that changes toward the output command value c _1, c ₂ , Take these deviations and load adjustment signal according to the deviation
f ₁ and f ₂ are output, and feedback control is performed to increase the output of each generator so as to reach the set total output command value a while maintaining the water level change rate of the river water level due to water discharge at a certain value or less. Was.

(Problems to be Solved by the Invention) In the above-described conventional apparatus, each of the power plant total load change rates set based on the allowable river water level change rate is divided by the number of generators in the station. Limits the rate of change in generator load.

According to this, for example, when the two generators are both in a state in which the output can be changed and both are operated at the same load change rate, the river water level is quickly changed while changing the river water level at the value of the allowable maximum discharge amount. Can be reached.

However, when only one generator can change the output, the amount of water discharged is 1/2 compared to when both generators can change the output, and the follow-up time to the output command value is doubled. turn into.

Also, as shown in FIG. 7, even when two generators are operated together, if the start-up times are different, while only the preceding unit is in operation (t ₁ ≦ t ≦ t _{2 in the} figure). Until the succeeding machine reaches the following machine output command value (t ₃ ≦ t ≦ t _{4 in the} figure), the load change rate for one generator is limited. As in the case of operation by one unit, there is a problem that the ability to follow the total output command value is poor, and the good following ability, which is a feature of the hydroelectric power plant, cannot be sufficiently exhibited.

Therefore, the present invention, regardless of the number of operating generators,
It is an object of the present invention to provide a load adjusting device capable of reaching a total output command value in the fastest time within an allowable river water level change rate limit.

[Structure of the Invention] (Means for Solving the Problems) The present invention restricts the change rate of the set total output command value first based on the allowable change rate of the river water level. The total output command value whose rate of change is limited is distributed to each generator without omission, and the sum of the load change rates of each generator is maintained until the output of the power plant reaches the set total output command value. Is always the maximum allowable load change rate.

(Operation) This allows the output of the power plant to be adjusted to the total output command value set at the fastest time while maintaining the water level change rate of the river water level within an allowable range regardless of the number of generators operating. Can be reached.

(Embodiment) FIG. 1 shows a load adjusting device for a hydroelectric power plant according to an embodiment of the present invention. 6 that are the same as or correspond to those in FIG. 6 are denoted by the same reference numerals, and the description thereof will be omitted.

The total load change rate restriction processing unit 4 inputs the total output command value a and the operation statuses b ₁ and b ₂ of each unit to limit the total load change rate of all the generators of the power plant, and It outputs a total output actual command value g that changes at a rate. The load change rate distribution processing unit 5 includes the total output actual command value g output from the total load change rate restriction processing unit 4 and the operation state of each unit.
Input b ₁ , b ₂ , calculate the load change rate to be distributed to each unit, add the calculated result every moment, and add the actual command value d ₁ , d ₂ to each unit as the addition result. These are output to the adjustment controllers 3A and 3B.

FIG. 2 shows the internal configuration of the load change rate distribution processing unit 5.

In the figure, the actual command value change rate distribution processing unit 6 inputs the total output actual command value g and the operating states b ₁ and b ₂ of each unit, and calculates the change of the input total output actual command value g to each unit. And the actual command value change signals h ₁ and h ₂ to each unit.
Is output. Each unit actual command value calculation processing unit 7A, 7
B inputs the actual command value change signals h ₁ and h ₂ of the respective units from the actual command value change rate distribution processing unit 6, adds these momentarily, and outputs them as the actual command values d ₁ and d ₂ . Things.

Next, in the load adjusting device of the hydroelectric power plant configured as described above, when the total output command value a is set, the total actual output, which is the sum of the output values of the respective units, depends on the number of operating units. The total output command value a set at a constant rate of change
Will be described with reference to FIGS. 3 to 5. FIG.

When the total output command value a is set in the power plant, the total load change rate control processing unit 4 calculates a maximum load change rate (hereinafter, referred to as ΔP) within a permissible range of water discharge, and integrates the integrated load change rate. The value is output as the total output command value g. The actual command value change rate distribution processing unit 6 in the load change rate distribution processing unit 5 receives the total output command value g and the operation states b ₁ and b ₂ of each of the units and, as shown in FIG. A change Δ per unit time Δt of the total output command value g that changes at a constant change rate
P is distributed according to the load condition of each unit. At this time,
In the case where the number of generators whose load can be changed is one, ΔP is directly distributed to the operating machine as shown in FIG. If there are two generators whose load can be changed, ΔP / 2 is distributed to both units, and the actual command value change signals h ₁ and h ₂ are assigned to each unit so that the load change rate always becomes ΔP as a whole. Actual command value calculation processing unit 7A,
Output to 7B. Each unit the actual command value calculation processing section 7A, 7B is the each car actual command value distributed variation signal h _1, h ₂ adds every moment, the actual command value d ₁ as an output target value of each unit, and outputs the d _2. Then, each unit load adjustment control unit 3A, 3B, respectively enter the actual command value d _1, d _2, each unit load adjustment them so as to follow each unit of real output e _1, e ₂ as the target value The signals f ₁ and f ₂ are output. FIG. 5 shows an example of a follow-up characteristic until the total output value of the generator at this time reaches the set total output command value.

FIG. 5 is an example of the case where the number of operating vehicles whose load can be changed changes, and is a characteristic diagram when there is a difference in the startup time of the generator.

When the total output command value a is set, the preceding
The sum of the actual output values e ₁ and e ₂ of the respective units (starting at t ₁₎ and subsequently starting at time t ₂ and ending at time t ₄ when reaching the total output command value a ( = E ₁ + e ₂ )
Rises at a constant rate of change. This is because the total output value e reaches the total output command value a until the following device starts up (t ₁ ≦ t ≦ t _{2 in the} figure) and after the preceding device reaches its own output command value. Until (t ₃ ≦ t ≦ t _{4 in the} figure), only one generator can change the load, so the actual command values d ₁ and d _{2 of} the preceding and succeeding units are changed in each section. Only one of them increases by ΔP, and when both the preceding and following units are in operation (t ₂ ≦ t ≦ t _{3 in the} figure), the actual command value of each unit
This is because both d ₁ and d ₂ increase by ΔP / 2. That is, when one generator is capable of changing the load even if the number of operating machines changes (t ₁ ≦ t ≦ t ₂ and t ₃ ≦ t ≦ t _{4 in the} figure), ΔP is assigned to the generator, In addition, there are two generators that can change the load.
In the case of a unit (t ₂ ≦ t ≦ t _{3 in the} figure), ΔP is set to ΔP /
By distributing by two, the overall load change rate can be always kept constant until the total output command value a is reached.

As described above, according to the present embodiment, the total load change rate can be kept constant regardless of the number of operating units. By maximizing the rate of change, the time to reach the set total output command value can be minimized.

In the present embodiment, the number of generators is described as two. However, it is needless to say that the same control can be performed when there are two or more generators.

[Effects of the Invention] As described above, according to the present invention, regardless of the number of generators operated, the total output command value is reached in the shortest time within the limit range of the allowable overall load change rate. It is possible to provide a load adjusting device for a hydroelectric power plant, which makes it possible to prevent the water level of the river from rising rapidly.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a load adjusting device of a hydroelectric power plant according to an embodiment of the present invention, FIG. 2 is an internal configuration diagram of a load change rate distribution processing unit of FIG. 1, and FIG. FIG. 4 is an explanatory diagram of a change rate of an actual output command value, FIG. 4 is an explanatory diagram of a change rate of an actual command value of each unit in FIG. 1, FIG.
FIG. 1 is a configuration diagram of a conventional load adjusting device for a hydroelectric power plant, and FIG. 7 is a diagram illustrating a tracking characteristic of the conventional device. 1 load distribution processing unit, 2A, 2B load change rate restriction processing unit, 3A, 3B load adjustment control unit, 4 total load change rate restriction processing unit, 5 load load rate distribution processing unit , 6 ... Actual command value change rate distribution processing unit, 7A, 7B ... Actual command value calculation processing unit.

Claims (1)

(57) [Claims] 1. A load adjusting device for a hydroelectric power plant, which adjusts the outputs of a plurality of generators installed in a hydroelectric power plant having a limited rate of change in river water level based on an integrated output command value. Total load change that limits the sum of the load change rates distributed to each generator based on the output command value, the operating state of each generator, and the water level change rate limit value, and outputs a total output actual command that changes at a constant change rate Rate limiting processing unit, the actual command value based on the total output actual command output from the comprehensive load change rate limiting processing unit and the load change rate distributed to each generator calculated based on the operating state of each generator. A load change rate distribution processing unit that calculates and outputs the load change rate distribution processing unit; and a load adjustment control unit that calculates a deviation between the actual command value and the actual output value for each generator and outputs the deviation as a load adjustment command for each generator. Load adjustment equipment for a hydroelectric power plant .