JPH06276795A - Controller for main engine shaft-driven generator - Google Patents

Abstract

PURPOSE:To stably control by so presetting a value of an integral amplifier that a difference of DC voltages of a converter and an inverter becomes a predetermined value at a time point when a current control.is restarted from a phase iris. CONSTITUTION:A controller for a main engine shaft-driven generator calculates a value of an integral amplifier 53 of a current controller 15 in which a converter DC voltage coincides with an inverter DC voltage with a condition decided by a deciding unit 22, a voltage detected value of a shaft generator 1, a voltage detected value of a synchronous phase modifier 4 and a limit value set by phase control angle limit setters 58A, 58B of the converter and the inverter by a reset calculator 23. A bias amount of a minimum limit set by a bias amount setter 24 is subtracted by a bias amount subtracter 25, and the value of the amplifier 53 of the controller 15 is switched to a value in which a difference of the converter DC voltage and the inverter DC voltage becomes a predetermined value according to a signal from a reset signal generator 54. As a result, a recovery time from a phase iris state is shortened, and a stable frequency control can be conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main shaft drive power generator for a ship, which enables high speed switching between power generation and electric drive of the main shaft drive generator and stable control. The present invention relates to a device control device.

[0002]

2. Description of the Related Art A main shaft drive generator is a system for driving a generator by a main engine of a ship to generate electric power, which has a great effect on energy saving and maintenance and is used in many ships.

FIG. 3 is a block diagram of a conventional main-generator drive power generator. In the figure, 1 is a shaft generator, 2 is a converter,
3 is an inverter, 4 is a synchronous phase adjuster, 5 is a main engine, 6
Is a propeller, 7 is a load, 8 is a circuit breaker, 9 is a busbar, 10 is an output frequency command setter, 11 is an output frequency detector, and 12
Is a frequency controller that calculates the current command value by the deviation between the output frequency command and the output frequency detection value, 13 is a current limiter that limits the current command value, 14 is a current detector, and 15 is the current command value and the current detection value. A current controller including a deviation amplifier including an integrating amplifier that calculates the phases of the inverter 3 and the converter 2 so as to match, 16 is a phase controller of the converter 2, 17 is a phase controller of the inverter 3, and 18 is a shaft generator 1. Is a voltage regulator for controlling the terminal voltage of, and 19 is a voltage regulator for controlling the terminal voltage of the synchronous phase shifter 4.

The operation of the conventional main shaft drive generator will be described below with reference to FIG. Generally, a power generation operation for generating electric power and an electric operation for energizing the engine by the electric power of another generator are known for the main shaft drive generator.

First, the power generation operation will be described. The main engine 5 drives the propeller 6, but at the same time the shaft generator 1 is driven.
Also drives. Since the rotation speed of the main engine 5 changes depending on the navigation state, the frequency of the AC power of the shaft generator 1 also changes. Therefore, the converter 2 once converts alternating current into direct current, and the inverter 3 converts it into constant frequency alternating current power.
The synchronous phase shifter 4 supplies reactive power to the inverter and the load to keep the voltage of the bus bar 9 constant. The obtained constant-frequency constant-voltage power is supplied to the load 7 through the breaker 8 and the busbar 9.

Next, the electric operation will be described. The inverter 3 is used as a forward converter and the converter 2 is used as an inverse converter by controlling the firing angles of the converter 2 and the inverter 3. Another engine generator (not shown) is connected to the bus bar 9 in the system inside the ship, and the electric power is supplied to the inverter 3 through the circuit breaker 8. Therefore, the inverter 3 once converts the alternating current into the direct current, and the converter 2 converts the alternating current into the variable frequency power, and the shaft generator 1 is operated as a synchronous motor.
Energize the engine.

The main-shaft drive power generator can be operated by switching between the power generation operation and the electric operation depending on the use condition of the electric power in the ship or the necessary condition of the propulsion force, so that the efficient operation is possible. .

FIG. 4 is a detailed view of the current controller 15. 5
1 is a subtractor for calculating the deviation between the current detection value detected by the current detector 14 and the current command value output from the frequency controller 12, and 52 is a proportional for performing a proportional operation for the deviation from the subtractor 51. An amplifier, 53 is an integrating amplifier that performs an integral calculation on the deviation from the subtractor 51, and 54 is the frequency controller 1
2 is a reset signal generator that detects the polarity change of the current command value output from 2, that is, the mode change between power generation operation and electric operation, and resets the integrating amplifier;
Is added to the calculation result of the integrating amplifier 53, 56 is a phase calculator for calculating the converter and inverter phase control angle command values based on the deviation amplifier output signal, 5
7A and 57B are limiters for limiting the converter and inverter phase control angle command values calculated by the phase calculator 56, and 58A is a converter phase angle control angle limiter 157A.
Is a setter for setting the limit value of the inverter phase control angle limiter 57B, and 58B is a setter for setting the limit value of the inverter phase control angle limiter 57B.

In order to reduce the size of the shaft generator 1, the converter usually has a constant phase control angle α = 0 ° in a power generating operation.
In electric operation, the phase control angle α is controlled to be constant at 150 °. The deviation amplifier output signal is used as the phase reference of the inverter to adjust the current by the phase control of the inverter.

[0010]

According to the main shaft drive power generator operated as described above, a constant frequency / constant voltage power source can be obtained by the power of the main engine, which is effective in energy saving / maintenance saving. . In the conventional system, when switching between the power generation operation and the electric operation of the main shaft drive generator,
By resetting the value of the integrating amplifier 53 of the current controller 15 to the minimum value, the control angles of the converter 2 and the inverter 3 are brought into a phase squeezing state of about α = 150 °, and the current is once switched to zero. After switching, the phase corresponding to the deviation between the current command value and the current detection value is set to the current controller 15
Calculate with and advance the control angle. However, the current controller 1
Since the value of the integrating amplifier 53 of 5 is reset to the minimum value,
There is a phenomenon in which frequency control becomes unstable when it takes time to advance the control angle, the current starts to flow slowly, and switching frequently occurs.

The present invention has been made in view of the above circumstances, and an object of the present invention is to perform main-machine-shaft drive power generation capable of performing high-speed switching between power-generating operation and electric-drive operation of a main machine-shaft drive generator and capable of stable control. It is to provide a control device for the device.

[0012]

In order to achieve the above object, the present invention provides a shaft generator driven by a main engine of a ship, a converter for converting the output of the shaft generator into a direct current, and the converter. An inverter for converting the DC output of the AC into a constant frequency AC, a synchronous phase adjuster for supplying reactive power to the inverter and the load, and an output current command value of the converter so that the frequency of the synchronous phase adjuster becomes a predetermined value. A frequency controller for calculating, a current controller including an integrating amplifier that gives a firing angle command value to the converter and the inverter so that the output current matches the output current command value, and a firing angle of the converter. In a main shaft drive power generator comprising a first phase controller for controlling and a second phase controller for controlling the ignition angle of the inverter, in order to make the output current zero, When performing the phase narrowing of the inverter and the inverter, when the current control is restarted from the phase narrowing, the difference between the DC voltage of the converter and the DC voltage of the inverter becomes a predetermined value, The feature is that the value of the integrating amplifier is preset.

[0013]

According to the controller of the main shaft drive generator of the present invention, the recovery time from the phase squeezing state to the start of the current flow at the time of starting the main shaft drive generator or switching between the power generation operation and the electric operation is performed. It can be shortened and frequency control can be performed stably.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. The same parts as those in FIGS. 3 and 4 are designated by the same reference numerals and the description thereof will be omitted.

In the figure, 20 is a detector for detecting the voltage of the shaft generator 1, 21 is a detector for detecting the voltage of the synchronous phase adjuster 4, and 22 is a voltage detection value of the shaft generator 1 and the synchronous phase adjuster 4.
Of the voltage generator of the shaft generator 1 and the voltage detector of the synchronous phase shifter 4 based on the detected voltage value and the limit value of the phase control for determining whether the converter for performing the phase control is a converter or an inverter. An integral reset calculator for calculating the converter DC voltage and the inverter DC voltage from the limit value of the phase control angle command value and the value of the integrating amplifier 53 of the current controller 15 where the converter DC voltage and the inverter DC voltage match, 24 Is a reset value bias amount setting device, 25 is a bias amount subtracter for subtracting the setting value of the bias amount setting device 24 from the calculation result of the integral reset computing device 23, and 26 is the current controller 15 by the signal of the reset signal generator 54. The value of the integrating amplifier 53 of
It is a switching device for switching to the calculation result of.

The operation of this embodiment will be described below with reference to FIG. The condition determined by the determiner 22, the voltage detection value of the shaft generator 1 and the voltage detection value of the synchronous phase shifter 4,
The value of the integration amplifier 53 of the current controller 15 at which the converter DC voltage value and the inverter DC voltage match is determined by the integral reset calculator 23 according to the limit values set by the converter and inverter phase control angle limit setters 58A and 58B. Calculate If the value calculated by the integral reset calculator 23 is switched to the same value, an inrush current may flow due to a calculation error. Therefore, the minimum bias amount set by the bias amount setter 24 is set to the bias amount subtracter 25. To reduce. A signal from the reset signal generator 54 causes the value of the integrating amplifier 53 of the current controller 15 to be a value such that the difference between the converter DC voltage and the inverter DC voltage, which is the subtraction result of the bias amount subtractor 25, becomes a predetermined value. Switch to. As a result, the recovery time from the phase squeezing state is shortened, and stable frequency control can be obtained.

FIG. 2 shows characteristics of current recovery from phase narrowing and the integrated value of the integrating amplifier 53 with respect to time. That is, FIG. 2A is based on the conventional method of resetting the integrated value to the minimum value, and FIG. 2B is based on the method of presetting the calculation result of the bias amount subtracter 25 according to the present invention. As can be seen, the method according to the present invention has a shorter current recovery time from zero than the conventional method, and stable control can be performed.

In the above embodiment, the shaft generator voltage detector (2
Each element of 0) to the switch (26) is realized by independent hardware, but the present invention is not limited to this, and similar functions can be realized by software of a microcomputer.

[0019]

As described above, according to the controller of the main shaft drive generator of the present invention, the recovery time from the phase squeezing state to the start of current flow at the time of switching between the power generation operation and the electric operation in the shaft generator. Can be shortened and stable control can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device for a main shaft drive power generator that is an embodiment of the present invention.

FIG. 2 is a characteristic diagram comparing the current recovery time due to phase narrowing and the integrated value of the integrating amplifier between the present invention and the conventional example.

FIG. 3 is a block diagram of a control device for a conventional main shaft drive power generator.

4 is a detailed block diagram of the current controller of FIG.

[Explanation of symbols]

1 ... Shaft generator, 2 ... Converter, 3 ... Inverter, 4 ...
Synchronous phase shifter, 5 ... Main engine, 7 ... Load, 12 ... Frequency controller, 15 ... Current controller, 51 ... Subtractor, 52 ... Proportional amplifier, 53 ... Integral amplifier, 54 ... Reset signal generator, 55 ... Addition , 56 ... Phase calculator, 57A ... Converter phase control angle limiter, 57B ... Inverter phase control angle limiter, 58A ... Converter control angle limit setter, 58B ... Inverter control angle limit setter, 16,
17 ... Phase controller, 20 ... Shaft generator voltage detector, 21 ...
Synchronous phase shifter voltage detector, 22 ... Judgment device, 23 ... Integral reset computing device, 24 ... Bias amount setting device, 25 ... Bus ass amount subtractor, 26 ... Switching device.

Claims (1)

[Claims] 1. A shaft generator driven by a main engine of a ship, a converter for converting an output of the shaft generator into a direct current, an inverter for converting a direct current output of the converter into a constant frequency alternating current, and the inverter. And a synchronous phase adjuster that supplies reactive power to the load, a frequency controller that calculates the output current command value of the converter so that the frequency of the synchronous phase adjuster becomes a predetermined value, and the output current to the output current command value. Current controller including an integrator amplifier for giving a firing angle command value to the converter and the inverter so as to match, a first phase controller controlling a firing angle of the converter, and a firing angle of the inverter. In the main shaft drive generator including the second phase controller for controlling, when performing phase narrowing of the converter and the inverter to make the output current zero, When the current control is restarted from the phase restriction, the value of the integrating amplifier of the current controller is preset so that the difference between the DC voltage of the converter and the DC voltage of the inverter becomes a predetermined value. A control device for a main shaft drive power generation device, which is characterized in that