JPH05161273A - Method of controlling number of running generators - Google Patents

Abstract

PURPOSE:To prevent overload condition even if the rated powers of generators are different in the case of controlling a plurality of generators running under the effective power balance control by running and stopping the operations thereof. CONSTITUTION:It is judged whether or not total sum (SIGMAGn-1) of the rated power of the generators other than those to be stopped among a plurality of generators under the running condition is larger than the product of a load power (PL) and a constant K (for example, 1.1) (step S3). As a result, when the total sum (SIGMAGn-1) is larger, a stop instruction is issued to a generator having the higher priority (for example, No. 3 generator, then the stop instruction is given in the sequence of No. 3 generator No. 2 generator No. 1 generator) (step S4) and such a stop instruction is not issued when the total sum is smaller.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is a cogeneration system (cogeneration).
The present invention relates to a condition for stopping a generator in a facility, and particularly to a method for controlling the number of operating generators.

[0002]

2. Description of the Related Art Conventionally, a method of starting and stopping a plurality of generators and its conditions (controlling the number of operating machines) are, for example, three generators, starting order is No. 1 → No. 2 → No. In case of starting, the next unit is started when the output of the previous unit becomes 90% or more of the rated value. If stopped, the output of Unit 3 is rated at 50
When the output of Unit 2 is less than 30% of the rated value, Unit 2 is stopped.

The number of generators, the starting order and the stopping order are not a single setting.

[0004]

In the above-mentioned control of the number of operating machines, if the ratings of the generators are different from each other, the generator may be overloaded. For example, the rating of Unit 1 is 200K
W, Unit 2 is rated at 200 kW, Unit 3 is rated at 500
Assuming KW, the stopping power of Unit 3 is 250K when 3 units are in operation.
It becomes W (= 500 × 50%). At that time, No. 1, No. 2, No. 3
Unit 1 is performing active power balance control, and Unit 1 is 100
KW, No. 2 unit is 100KW, load power is 450K
It becomes W (= 100 + 100 + 250). 3 in that state
When the No. 1 unit is stopped, the total rated power of the No. 1 and 2 units is 400K.
A load of 450 KW is applied to W, resulting in an overload state.

The present invention has been made in view of the above points, and an object thereof is to provide a method for controlling the number of operating generators that does not cause an overload state even when the rated power of the generators is different.

[0006]

SUMMARY OF THE INVENTION The present invention is a method for controlling the number of operating generators of a plurality of generators for performing active power balance control and supplying electric power to a load. When the total of the rated power is larger than the load power, the operation of the generator to be stopped is stopped.

[0007]

[Function] When any one of a plurality of generators is stopped, the total rated power of the generators in operation is larger than the load power, so that the generators in operation may be overloaded. There is no. Therefore, even when the ratings of the plurality of generators are different from each other, the operation stop control can be performed without falling into the overload state.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a procedure for carrying out the method of the present invention. In step S ₁ , active power balance control is performed on a plurality of generators. When the load power decreases in step S ₂ , the total rated power of the generators other than the generator to be stopped in step S ₃ (ΣG _n-1 )
Is greater than the product of the load power (P _L ) and a constant (K, eg 1.1). As a result, when the total of the rated power (ΣG _n-1 ) is larger, the stop command is given to the machine with the higher stop order (the machine with the stop order of 3 → 2 → 1 is the 3rd machine), If small, do not give. That is, the condition for stopping the generator is when the inequality ΣG _n-1 > K × P _L (1) holds.

By thus performing the stop control, it is possible to prevent the generators from being overloaded even when the ratings of the generators are different. The constant K is not limited to 1.1 and may be set arbitrarily.

[0010]

As described above, according to the present invention, when the sum of the rated power of the generators other than the generator to be stopped is larger than the load power, the operation of the generator to be stopped is stopped. Therefore, even when the generators have different ratings, it is possible to control the number of operating generators without falling into an overload state.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

Claims (1)

[Claims] 1. In a method for controlling the number of operating generators that perform active power balance control and supply power to a load, the sum of rated power of generators other than the generator to be stopped is the load power. A method for controlling the number of operating generators, wherein the operation of the generators to be stopped is stopped when the value is larger than the above.