JPH0223037A - Power receiving facility controller - Google Patents

Abstract

PURPOSE:To reduce the load of a generating facility by operating a non-utility generator when the total power demand exceeds over a reference level. CONSTITUTION:Current signal Si1 and voltage signal Sv1 of a commercial power source 20 are detected through a current detector 9 and a voltage detector 8 and fed to a first power detector 41a, while current detection signal Si2 and voltage detection signal Sv2 of a general load 6 and a high frequency load 7 are fed through an overload current detecting section 30 and a voltage detector 22 to a second power detector 41b. The first and second power detectors 41a, 41b produce positive and negative voltage signals respectively then they are compared, at a comparing section 43, with set signals ted from voltage setters 47a, 47b thus producing a differential signal. A controller 44 operates in proportion to the differential signal to close the contacts in output circuits 45a, 45b based on a dead zone set signal fed from a dead zone setter 46 and controls closing function of each circuitbreaker based on a control command signal therefor. By such arrangement, load of the generator 12 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a control device for power receiving equipment, and more particularly to a control device for power receiving equipment that controls power generating equipment in response to rapidly fluctuating loads.

B1 Summary of the Invention The present invention provides a control device for power receiving equipment that receives a predetermined standard amount of power from a commercial power source, and when the commercial power amount exceeds the standard amount of power, operates a private generator to supply power to a load. In this method, the burden on the generator equipment is reduced by not directly burdening the private generator with electricity bonds for high-frequency switching loads.

C1 Conventional technology If a customer receives high-voltage power and has a regularly used in-house power generation facility, reverse transmission of power to the power company is not allowed unless the power transmission line from the power company is a specially dedicated line. Therefore, automatic power control (APC), which controls the received power at a constant level, is generally performed at the power receiving point.

Fig. 3 shows a conventional power receiving equipment control device, where 1 is a disconnector connected to, for example, a GKV commercial power source 20, 2 is a breaker connected to a disconnector I, and 3a, 3b, and 3c are power receiving equipment. A circuit breaker connected to point J, 4a and 4b are transformers, 5
A to 5c are open/close switches, 6a and 6b are general loads, and 7 is a frequently applied load such as a crane. 8 is a voltage detector (PT) connected between the disconnector ■ and the breaker 2,
9 is a current detector (
CT), lO is the voltage signal of voltage detector 8 and current detector 9
11 is a governor controlled by the output signal of the automatic power control circuit IO; 12 is a private generator; and 13 is a voltmeter.

According to the power receiving equipment control device shown in FIG. 3, the automatic power control circuit IO detects the received Wffl, controls the governor 11 with the detection signal, and thereby controls the amount of power generated by the private power generator 12.

D. Problems to be Solved by the Invention According to the conventional power receiving equipment control device shown in FIG. 3, the automatic power control circuit 10 sets the required power amount P in the power receiving equipment as shown in FIG. Power ff1P. is compared and detected, and the private generator I2 is controlled based on the amount of deviation. That is, the required received power amount PI is the set received power amount P. If it becomes larger, the automatic power control circuit IO operates the governor 11 and makes the private generator I2 bear the power amount of P+Pa.

However, if there is a high-frequency input load 7 that frequently turns on and off among the equipment loads, all of the fluctuations are covered by the private generator! 2
This placed a heavy burden on the generator equipment.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to compare the total power demand of power receiving equipment with the reference power amount to be received from a commercial power source, and calculate the total power demand. To provide a counterfeit device for power receiving equipment that can reduce the burden on power generating equipment by operating a private generator when the amount of power exceeds a reference power amount.

E1 Means for Solving Problems In order to achieve the above-mentioned object, the present invention receives a predetermined standard amount of power from a commercial power source, and when the required amount of power reaches the above-mentioned base Q power 1 or more, generates private power. Operate the machine,
A control device of a power receiving equipment that supplies power to a load detects and compares the amount of power received from a commercial power source and the required power of a frequently turned on load, and when the deviation value exceeds a set value, starts the private generator. make it work.

F. EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a control device for power receiving equipment according to this embodiment, and the same or corresponding parts as those in FIG. 3 are given the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 1, 31a and 31b are current detectors 32a for detecting the load current of the frequently applied load 7.

32b is a detection input winding that is connected to the current detectors 31a and 31b, respectively, and generates magnetic flux according to the amount of current detected by the current detectors 31a and 31b.

33 is an iron core around which these detection input windings 32a, 32b are wound; 34 is a detection output winding also wound around iron core 33;
3 and the detection output winding 34
0 is configured.

41a is a second power detector which manually generates the current detection signal S11 of the current detector 9 and the voltage detection signal Svl of the voltage detector 8; 41b is the voltage detection signal Svt of the voltage detector 22;
This is a second power detector which receives as input the high current detection signal stf corresponding to the current of the high frequency load 7. 42 is an amplifier, 4
Reference numeral 3 denotes a matching unit that receives the output signal of the amplifier 42 and the voltage setting signal of the first voltage setter 47a or the second voltage setter 47b as input, and 44 a control that receives the deviation output signal of the matching unit 43 as input. 45a is a first output circuit, 45b is a second output circuit, and 47 is a dead zone setting device. The first of these. Second power detectors 41a, 41b, amplifier 42, controller 44, and output circuit 45a.

45b and the dead zone setting device 46, the power control unit 40
is configured.

In the control device for the power receiving equipment having the above configuration, as shown in FIG. 2, the amount of power Po received from the commercial power source 20 is set to be approximately constant m.

Pl is the power generation amount of the private power generator 12, and P is the required power amount of the high-frequency load 7, which bears the power amount when the total demand power bond becomes 20 or more (P+Pa).

That is, of the amount of power received from the commercial power supply 20, the current detection signal Sll is detected by the current detector 9, and the voltage detection signal S V+ is detected by the voltage detector 8, and these are the first power as the power detection signal. The signal is input to the detector 41a. In addition, the received power amount of general load and high frequency load 7
The voltage component is detected by the voltage detector 22 out of the total demand power bond with the received power amount of - the voltage detection signal Sv
1 is manually input to the second power detector 41b, the current component of the received power of the high-frequency load 7 is detected by the high-frequency load current detection section 30, and the current detection signal SXt is inputted to the second power detector 41b.
is input to the power detector 41b.

The first power detector 11a outputs a positive voltage signal, and the second voltage detector 41b outputs a negative voltage signal. These voltage signals are matched and input to an amplifier (AMP) 42. Amplifier 42. amplifies these voltage deviation signals and inputs them to the matching section 43. The matching section 43 matches the output signal of the amplifier 42 with the setting signal of the voltage setting device 47a or 47b to obtain a deviation signal, and inputs this deviation signal to the controller 44 manually. The controller 44 operates in proportion to the deviation signal from the butt section 43, operates the contacts of the output circuits 45a and 45b based on the dead zone setting signal of the dead zone setting device 46, and operates the contacts of the output circuits 45a and 45b based on the control command signal. The new installation operation is controlled, thereby reducing the burden on the generator 12.

G1 Effects of the Invention The present invention is as described above, and detects the total power demand of the power receiving equipment by comparing and detecting the standard amount of power to be received from the commercial power source, and when the total amount of power demand becomes larger than the standard amount of power, Since it operates a generator, it is possible to reduce the burden on the power generation equipment and to obtain highly reliable power receiving equipment.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a control device for power receiving equipment according to an embodiment of the present invention, Fig. 2 is a diagram of its operating characteristics, Fig. 3 is a block diagram of a conventional control device for power receiving equipment, and Fig. 4 is its operating characteristics. It is a diagram. 3a to 3c, 21... Breaker, 6a... General load, 7... Frequently turned on load, 8... Voltage detector, 9.
... Current detector, 12... Private generator, 20... Commercial power supply, 22... Voltage detector, overload current detection section, 3
1a. 31b... Current detector, 40... Power control unit, 41
a... First power detector, 41b... Second power detector, 43... Butt portion, 44... Controller, 45a. 45b...output circuit.

Claims (1)

[Claims] (1) In a control device for power receiving equipment that receives a predetermined standard amount of power from a commercial power source and operates a private generator to supply power to a load when the required amount of power exceeds the standard amount of power, The power generator is characterized in that it detects and compares the amount of power received from a commercial power source and the amount of power required for a frequently turned-on load, and operates the private generator when the deviation value exceeds a set value. Control device for power receiving equipment.