JPS5829330A - Power supply system - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to energy-saving operation of a system that supplies power to a load by combining a power generator, a charging unit, an inverter, a storage battery, etc. The aim is to reduce operating costs. Traditionally, motor generators have been commonly used as a power supply source for areas without commercial power sources.
Ko. However, this oak generator has the disadvantage that the efficiency decreases significantly during light load operation, and the operating cost becomes high rpJ in applications where the load factor is small, such as general household loads.

This system improves the above-mentioned drawbacks and is composed of a motor generator, a charger, an inverter, a storage battery, etc., and the load connected to the output circuit of the motor generator, the charger input circuit, and the inverter output circuit. It also has a circuit in which a charger output circuit and an inverter input circuit are connected in parallel, and when the generator output wli is within a predetermined value, the phase relationship between the generator and the inverter is adjusted to generate power. The inverter adjusts the load so that the inverter shares the load, and when a predetermined value is about to be exceeded, only the excess amount is supplied from the inverter side.

Embodiments of the system of the present invention will be described below. FIG. 1 is a block diagram showing an embodiment of the present invention.
is a motor, 3 is a generator directly connected to the motor 1, 5 is a charger, 7 is a storage battery, 9 is an inverter, and 11 is a load. 13 is an r-shaped current transformer for detecting the output noise of the generator 8, and 15 is a current transformer for detecting the current supplied from the generator to the load 11. 17 is the output of generator B! This is a phase adjuster for determining the phase between the FE and the output Ill of the inverter 9.

19 is an electromagnetic contactor on the generator power supply side, and 21 is an aS contactor on the inverter power supply side. 28.25 is a phase difference control reactor. The charger shown in this example is a fixed WIL51E for floating charging of ordinary stationary storage batteries.
In addition to the function as a constant voltage charger, the wl and Wt detected by the current transformer 13 also act as a constant current, and if the output current of the generator 8 tries to exceed a certain value, the output current of the charger is changed. The output of the current transformer 18 is automatically controlled so that the output current of the generator 3 does not exceed a certain value. In addition, the inverter 9 can take out an output having a certain phase relationship with the generator output voltage, and a phase adjuster 17
Therefore, if the current wl supplied from the generator to the load exceeds a certain value, the phase on the inverter side is advanced and the excess load DC current is supplied from the inverter to the load 11. The operating principle of this embodiment will be comprehensively explained.

In general, two power supplies are connected in series with the output sides of the reactors via a parallel supply type IIE source equipment, and the phase difference between the output currents Eo and [il is 61. θ2
Then [power PI supplied from source ■ and power source ■,
P2 is given by, similarly to equation (1). If we consider the power supplied to the load, there is P between P+, Pz, and Po.
The following relationship holds true: 1+Pt=Po' (4).

For Pl, Ps, and Po, equation (4) always operates in a relationship that holds true, and PI and Pl are as follows (as is clear from the equation + IL f21).

The phase difference θr can take positive or negative values depending on the sign of at. That is, by adjusting the phase between the two power sources, it becomes possible to freely control the power supply state between the Wl source I and the Wl source ■. Next, examples of the present invention will be described.

The engine 1 causes the generator 3 to generate electric power, thereby supplying electric power to the load 11. When the load 11 force is small, the battery 7 is charged via the charging WL device 5, and the generator output is adjusted by the current transformer 13 to keep the generator output constant.

Even if it is closed, the load 11 is immediately supplied (I'll ~ none), so adjust the inverter phase, and then turn on the electromagnetic contactor 21 to time the inverter.

When the load increases and attempts to exceed the rating of the generator 8, the output of the current transformer 15 increases, and the phase adjuster 17 advances the output phase of the inverter (9) so that f exceeds the rating of the generator 3.
t5ft is supplied from the inverter 9 to the load.

Therefore, the generator can continue its rated operation.

Further, the output for operating the inverter is supplied from the storage 11a7. Lighting up of the storage wIL pond 7 is performed after the load DC decreases and there is a surplus in the generator output.

At this time, the current transformer 13 also generates l! The machine output wt flow is disappointing at the rated value. Further, by carrying out the present invention, the generator will not be operated in an overload range, so that the generator itself can be operated economically at the most fuel-efficient location. Therefore, overall, it becomes possible to significantly reduce fuel consumption and enable energy-saving operation.

[Brief explanation of the drawing]

FIG. 1 shows a block connection disease showing one embodiment of the present invention. 1...Motor, 3...Moving side 15...Charging WL device, 7...
Storage battery. 9...Inverter, 11...Load. 17... Phase adjuster.

Claims (1)

[Claims] It consists of a starter generator, a charger, an inverter, a #battery, etc., and the load and charger connected to the output circuit of the starter generator.
It has an E@s input circuit and an inverter output circuit, and also has a circuit in which the charger output circuit and the inverter input circuit are connected in parallel, and if the generator output current is within a predetermined value, the The phase relationship between the generator and the cough inverter is adjusted so that the generator wl1M shares the load, and when a predetermined value is about to be exceeded, only the excess amount is supplied from the inverter side. power supply system.