JPH02226314A - Power factor improving device - Google Patents

Abstract

PURPOSE:To efficiently use many capacitors different in capacity to improve and control the power factor by taking open/close states of respective breakers and the reactive electric energy into a center device and controlling the number of phase advancing capacitors in plural banks in accordance with these states. CONSTITUTION:The center device monitors states of breakers 01 to 04, 11 to 13, 21, 22, and 31 to 33 and a transformers 61 to 63 and takes in reactive power measured values measured by reactive volt-ampere meters 71 to 73 at intervals of a certain time. The number of phase advancing capacitors 40 is controlled in the combination of a maximum of three banks in accordance with open/close states of breakers 11 to 13, 21, 22, and 31 to 33. Thus, the number of phase advancing capacitors 40-1 to 40-n is controlled in accordance with the combination of respective banks so that the power factor is 100%.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power factor correction device that is an integral part of power receiving and transforming equipment in a building, and in particular, the present invention relates to a power factor correction device that is an integrated part of power receiving and transforming equipment in a building, and in particular, a power factor correction device that controls the number of phase advance capacitors in multi-stage banks ζ. The present invention relates to a power factor correction device that controls power factor improvement.

[Prior Art] Power factor improvement devices are used in power receiving and transforming equipment of buildings to improve the power factor.

2 and 3 are circuit diagrams of conventional power factor correction devices. Here, the power factor corrector shown in Fig. 2 installs a low-voltage capacitor individually for each load and controls the number of capacitors, and the power factor corrector shown in Fig. 3 High-voltage capacitors are installed all at once, and the number of capacitors is controlled for each bank.

In addition, in Figures 2 and 3, 01~04°21~2
4 is a circuit breaker, 11 to 14 are capacitors, 31 to 33 are transformers, and 41 to 44 are loads.

[Problems to be Solved] The conventional power factor improvement device described above had the following problems.

Although the capacitors 11 to 14 shown in FIG. 2 are installed individually for each of the loads 41 to 44, which is effective in reducing the loss in the distribution line, the number of loads is large. If there are too many capacitors, separate capacitors will be required for each load, resulting in a large number of capacitors with small capacities, increasing equipment costs. Further, when the load stops, the capacitor is no longer used, and the utilization rate of the capacitor decreases.

On the other hand, if the capacitors 11 and 12 are attached to the bus bar all at once, as shown in Figure 3, the capacitor utilization rate improves, but the loss reduction effect of the distribution line is lost, and furthermore, there are multiple banks. In this case, it is difficult to perform detailed control of a plurality of banks depending on the state of each bank, and a large number of capacitors of various capacities must be prepared.

The present invention has been made in view of the above-mentioned problem, and is a power factor that can perform power factor improvement control by efficiently utilizing capacitors with a large number of different capacitances installed corresponding to a plurality of banks. The purpose is to provide improvement equipment.

[Means for Solving the Problems] In order to achieve the above object, the power factor correction device of the present invention is provided correspondingly to each bank of power receiving and transforming equipment, , a power factor measuring means for measuring the reactive power or active power of each bank, a bank usage state detecting means for detecting the connection state between each bank, and an output value from the power factor measuring means and the bank usage state detecting means. The power factor improvement control means controls the number of phase advance capacitors by controlling the circuit breaker.

[Example] Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a circuit diagram of a power factor correction device according to an embodiment of the present invention.

In the same figure, 01-04, 11-13, 2122.3
1 to 33 are circuit breakers, respectively. Also, 40-1 to 4
0-n is a phase advance capacitor, and circuit breakers 50-1 to 50
- The number of capacitors 40 is controlled by opening and closing of n. On the other hand, 61 to 63 are transformers, and reactive power meters 71 to 73 are installed therein. Note that state monitoring and power factor improvement control of these devices are performed in a central device (not shown).

In the above configuration, the center device includes each circuit breaker 01 to 0.
4, 11 to 13, 21, and 22. The states of 31 to 33 and transformers 61 to 63 are monitored, and reactive power measurement values measured by reactive power meters 71 to 73 are taken in at regular intervals.

In this example, circuit breakers 11-13 and 21.22
．． The number of phase advance capacitors 40 is controlled within combinations of up to three banks according to the open/close states of capacitors 31 to 33.

Here, the combination pattern (hereinafter ζ) is shown below.

(1) When the circuit breaker 11 is closed and the circuit breaker 21 is open,
No, the number of phase advance capacitors 4o in one bank is controlled.

(2) The circuit breaker 12 is closed, the circuit breaker 21 is open, and
When the circuit breaker 22 is open, the number of phase advance capacitors 40 in the No. 2 bank is controlled.

(3) When the circuit breaker 13- is closed and the circuit breaker 22 is open, the number of phase advance capacitors 4o in the No. 3 bank is controlled.

(4) The circuit breaker 11 is closed, and the circuit breaker 21 is closed, and
When the circuit breaker 12 is open and the circuit breaker 22 is open, No.
The number of phase advance capacitors 40 in the 1st bank, No. 2 bank, and No. 2 bank is controlled.

(5) Circuit breaker 11 is open, circuit breaker 21 is closed, and circuit breaker 1
2 is closed and circuit breaker 22 is open, No.

1 hang and control the number of 400 phase advance capacitors in the N092 bank.

(6) The circuit breaker 12 is closed, the circuit breaker 21 is open, and
When the circuit breaker 13 is open and the circuit breaker 22 is closed, No.
The number of phase advance capacitors 40 in the 2 hang and the N013 hang is controlled.

(7) The circuit breaker 12 is open, and the circuit breaker 21 is open, and
When the circuit breaker 13 is closed and the circuit breaker 22 is a leap, No.
The number of phase advance capacitors 40 in the 2nd bank and the N003 bank is controlled.

Therefore, according to the above pattern, the switching on and off of the phase advance capacitor 40 is determined using the measured reactive energy amount and active energy amount, and the closing and disconnection instructions for the circuit breaker 50 are outputted from the center device to power up the circuit breaker 50. Perform rate improvement control.

In this way, this embodiment has a function to monitor the connection and operating status of a large number of phase advance capacitors with various capacities installed in multiple banks, and busbar communication circuit breakers and transformers installed between banks. Based on the reactive power measurement function and the measured reactive power, the power factor is adjusted to 1 for each bank combination according to the open/closed state of the busbar communication circuit breaker.
The function of controlling the number of phase advance capacitors is achieved so that the number of phase advance capacitors becomes 00%.

That is, a large number of phase advance capacitors and circuit breakers having different capacities are installed in a multistage bank, and the number of phase advance capacitors is controlled according to the open/closed state of the busbar communication circuit breaker.

[Effects of the Invention] As explained above, the present invention captures the opening/closing status of each circuit breaker and the amount of reactive power in a central device, and controls the number of phase advance capacitors across multiple banks according to the opening/closing status of the circuit breaker. By doing this, it is possible to control the number of phase advance capacitors installed in a large number of banks regardless of their capacity without being restricted by the open/closed state of the bus-bar communication circuit breaker. This has the effect of providing a power factor improvement device that can increase the power factor and perform effective and detailed power factor improvement control.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a power factor correction device according to an embodiment of the present invention, and FIGS. 2 and 3 are circuit diagrams of a conventional power factor correction device. 11-13, 21, 22. 31-33: Circuit breaker 40-
n: Phase advance capacitor 50- n: Breaker 71 to 73: Reactive power meter

Claims (1)

[Claims] A plurality of phase advance capacitors are provided corresponding to each bank of the power receiving and transforming equipment and have a circuit breaker for each, a power factor measuring means for measuring reactive power or active power for each bank, and a power factor measuring means for measuring reactive power or active power for each bank, and bank usage status detection means for detecting the connection state of the bank usage status detection means; and power factor improvement control for controlling the number of the phase advance capacitors by controlling the circuit breaker based on output values from the power factor measurement means and the bank usage status detection means. A power factor correction device characterized by comprising means.