JPS58198116A - Instantaneous power interruption protecting system in marine power source - 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 provides an instantaneous power outage protection type in a marine power supply device,
In particular, it is equipped with a generator driven by the propulsion engine of a fishing boat, etc., and the output from the nuclear generator is converted by a forward conversion circuit and an inverse conversion circuit to supply an alternating voltage with a constant frequency. In the marine power supply system, even after the output from the VjL generator is stopped,
By continuing to supply gate signals to each thyristor that constitutes the above-mentioned inversion circuit for a predetermined period of time, it is possible to prevent damage to the induction motor, etc. that may occur during a power outage, and to prevent commutation of each of the above-mentioned thyristors after a momentary power outage. This invention relates to an instantaneous power outage protection method for a marine power supply device designed to prevent failure.

Conventionally, power supply equipment for ships, especially fishing boats, has been equipped with a main generator driven by the main engine that drives the propulsion machine, and has taken into consideration the fact that the rotational speed of the main engine fluctuates greatly due to full-speed operation, etc. It is equipped with a relatively small-capacity auxiliary engine and an auxiliary generator driven by it, and when operating at full speed, etc., it uses stable frequency power from the auxiliary generator X&. Ta. However, as mentioned above, in addition to the main generator, there is an auxiliary
:1'11 Providing an engine and an auxiliary generator will not only increase the installation cost but also the fuel cost as a regular expense.

In order to solve this problem, we focused on the fact that the main reason for installing an auxiliary generator is the frequency fluctuation of the main generator.The output of the main generator is first converted to DC via a forward conversion circuit, and then inversely converted. A system for generating an alternating voltage with a constant frequency through a circuit was considered, and the inventors of the present application previously filed an application for a marine power supply device as shown in FIG. That is, in the power supply device for a marine vessel shown in FIG. The voltage is smoothed by a capacitor 3, and then converted into a constant frequency alternating voltage by an inverse conversion circuit 4 and supplied to a load. Although not shown, the forward conversion circuit 1 is composed of six thyristors connected in a so-called three-phase bridge system, and the six thyristors are connected to the gate signal generator 1.
By controlling the phase by gate signals G1 to G6 supplied from i115, the three-phase variable voltage that is the output of the generator is converted into a DC voltage. Further, the inverse conversion circuit 4 is also constituted by six thyristors (not shown) connected in a so-called three-phase bridge system.
Since the phases of the thyristors are controlled based on the gate signal GA or GF supplied from the gate signal generator 5, the DC voltage converted in the forward conversion circuit 1 is converted into an alternating voltage with a constant frequency. Ru.

Even in such a modified system, if the output of the generator is stopped for some reason and the fC occurs, the following problem occurs. That is, (1) the thyristor of the inverse conversion circuit 4 was given the gate t= signal from the gate signal generator 5 immediately before the output of the generator was stopped; The on state continues even after that. Therefore, the charge in the capacitor 3 flows through only two of the three-phase outputs from the inverse conversion circuit 4 to the load. As a result, the induction motor has [f
(ii) If the output stop time of the generator is instantaneous, the thyristor of the inverse conversion circuit 4 may Of these, there is a high possibility that commutation failure will occur due to the relationship between the thyristor that is in the on state when the output of the generator is stopped and the thyristor that is in the on state when the output is restarted.The present invention aims to solve the above problem. For the purpose of The purpose of this article is to provide an instantaneous power outage protection system for a marine power supply system that makes it possible to prevent commutation failure of each of the thyristors in the event of a power outage. do.

FIG. 2 is a block diagram of an embodiment of the gate signal generator shown in FIG. 1, showing the basic configuration of a power supply device for ships according to the present invention, and FIG. 3 is a reverse conversion control section shown in FIG. 2. 2 shows a time chart for explaining gate signals supplied to the inverse conversion circuit from FIG.

In FIG. 2 showing the configuration of an embodiment of the gate signal generator 5 (illustrated in FIG. g1) according to the present invention, reference numeral 6 denotes a power supply section;
7 is a forward conversion control unit, which is a forward conversion circuit 1 (as shown in FIG. 1).
8 is an inverse conversion control unit which generates gate signals G1 to G6 for each thyristor constituting the inverse conversion circuit 4 (shown in FIG. 1). 9 and 1° represent diodes, and 11 and 12 represent capacitors.

In FIG. 2, the output voltage of the generator driven by the engine for driving the propulsion device of a fishing boat, as described above, is led to the power supply section 6, and the power supply section 6 is connected to a constant voltage +
6V, ground, and -6V voltages are generated and supplied as power supply voltages to the forward conversion control section 7 and the inverse conversion control section 8.

The forward conversion control unit 7 is directly supplied with voltages of +6V, ground, and -6V from the power supply unit 6, enters the operating state 9, and enters the forward conversion circuit 1 (the forward conversion circuit 1 (the first Gate signals G1 to G4 are supplied to each thyristor constituting the thyristor (shown in FIG. 1).

Further, the inverse conversion control section 8 receives +6V from the power supply section 6 via the diode 91, -6V via the diode 10,
Then, the ground is directly supplied to the operating state, and the oscillation and division section 13 outputs 1w quaternary pulse signals as shown in the 31st prison diagram 14-1 to 14-6. Then, towards the output terminal 14- of the oscillation and frequency division section 13,
When the pulse signals 1 to 31 shown in FIG.
1 is turned on, and gate signals GA and GE shown in FIG. 3(6) are outputted via transformers 27A and 27E. Next, the output terminal 1 of the oscillation and division section 13
When the pulse signal shown in FIG. 3 (4) 14-2 is output from 4-2, the transistor 16 of the gate-amplifier section 14
and 22 are turned on, and ゛transformer 27
Illustrated gate signal GF of FIG. 3 via F and 27Ak
and GA are output. Similarly, from the oscillation and division section 13 to FIG. 3(4) 14-3. ..., 14-
In response to the pulse signal of 6, the gate signal G shown in FIG.
B and CF, . . . , GC and GE are output.

In this way, as shown in FIG. 3 CB), from the inverse conversion control unit 8, for example, gate signals GA and GE, GA and GF, etc. are transmitted during one cycle.
By sequentially supplying two gate signals such as GC and GE to the inverse conversion circuit 4 (shown in FIG. 1),
Each thyristor (not shown) constituting the inverse conversion circuit 4 is controlled, and the DC voltage output from the H1f conversion circuit 1 is converted into an alternating voltage.

In addition, in the present invention, as shown in FIG.
F) capacitors 11 and 12 are provided.

Therefore, even if the output of the generator is stopped and the supply of +6V and 16V t-line from the power supply unit 6 to the forward conversion control unit 7 and inverse conversion control unit 8 is stopped, the discharge time constant of the capacitors 11 and 12 is Within the time determined by
is output. In this case, diodes 9 and 10
is created, the above capacitors 11 and 1
The charged charges of No. 2 do not flow into the forward conversion control section 7,
The charges in the capacitors 11 and 12 are effectively consumed only for outputting the gate signals GA to GF.

In other words, the gate signals G1 to G6 from the forward conversion control section 7 disappear early, and the output of the forward conversion circuit 1 becomes zero.

In this way, even after the output of the generator is stopped, the gate signal OA or GF to the inverse conversion circuit 4 (shown in FIG. By being supplied,
Accidents such as undesired burnout of the induction motor load during a power outage described at the beginning of this specification can be prevented. Further, when the output of the generator stops for an instant of about 1 second, the gate signal O to the inverse conversion circuit 4 is
Since the supply of A to GF is continued, commutation failure of the thyristor constituting the inverse conversion circuit 4 can also be prevented. Note that the gate signal output from the inverse conversion control section 8 in the present invention is in a so-called double pulse system, with pulse 1- being made small, as shown in FIG. 3 CB), so that the inverse conversion Control unit 8 (
Self-expended electric power is reduced, and it becomes possible to lengthen the gate signal output continuation time when the output of the generator is stopped.

Note that the breaker trip control unit 30 detects when the abnormal voltage detection unit 28 detects an abnormality in the power supply voltage or when the reverse phase open phase control unit 29 detects an open phase or reverse phase of the source ridge pressure. , which controls the cutoff of the input play force (not shown) of this device.

As explained above, according to the present invention, in a marine power supply device, even when the output of the generator driven by the engine is stopped, the supply of gate signals to each thyristor constituting the inversion circuit continues for a predetermined period of time. This can prevent burnout of the rust-conducting motor load during a power outage and commutation failure of the thyristor when the power outage is a momentary power outage, and reduce the amount of noise output from the generator driven by the ship's engine. It becomes possible to convert stable electric power into stable electric power and supply it to negative phrases.

[Brief explanation of drawings]

1jIi1 is a basic configuration block diagram of an embodiment of a marine power supply device to which the instantaneous power outage sampling method of the present invention is applied; FIG. 2 is a detailed block diagram of an embodiment of the gate signal generator shown in FIG. 1; FIG. 3 shows a time chart for converting the gate signal outputted from the inverse conversion control section shown in FIG. 2. In the figure, 1 is a forward conversion circuit, 2 is a choke coil, 3 is a capacitor, 4 is an inverse conversion circuit, 6 is a power supply section, 7 is a forward conversion control section, 8 is a tl inverse conversion control section, 9 and 10 are #'i diodes. , 11 and 12 are capacitors, 14 is a gate 17
71, 15 to 26 are transistors, 27A to 27F are transformers, 28H is an abnormal voltage detection section, 29 is a negative phase/open phase control section, and 30 is a breaker trip control section. % fraudulent applicant 4PIk Electric Co., Ltd.

Claims (2)

[Claims] (1) A power generation system that is driven by a marine propulsion engine and whose output voltage is controlled by a voltage adjustment circuit, a forward conversion circuit that rectifies the output voltage from the generator,
A smoothing circuit including at least a capacitor that smoothes the output of the forward conversion circuit, an inverse conversion circuit that obtains a predetermined alternating voltage from the output from the forward conversion circuit, and control including gate signal supply to the forward conversion circuit. A power supply device for a ship, comprising a forward conversion control section, an inverse conversion control section that performs control including supplying a gate signal to the inverse conversion circuit, and a power supply section that generates a power supply voltage for the forward conversion control section and the inverse conversion control section. A capacitor and a diode for preventing backflow are provided on the input side of the inverse conversion control section, and after the supply of power supply voltage from the power supply section to the inverse conversion control section is stopped, the charge accumulated in the capacitor is connected to the inverse conversion control section. The gate signal is configured to be supplied to a control section, and the cough inversion control section continues to supply the gate signal to each thyristor constituting the inversion circuit for a predetermined period of time after the power supply voltage supply is stopped. Momentary power outage protection type for marine power supply equipment. (2) Claims characterized in that the inverse conversion control section is configured to generate at least two gate signals for each of the cyrisks constituting the inverse conversion circuit at a predetermined interval. Momentary power outage protection method 0 in the marine power supply system described in paragraph (1)