JPH11103598A - Controller for non-utility generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize received power from a commercial power system, by operating to lower the revolutions command value in response to differential power when the received power has fallen below a target value of the lowest received power to reduce generating power of a generator, thereby accelerating control of the generating power. SOLUTION: If the received power detected by a received power detector 15 is larger than a target value of the lowest received power, an output of a subtracter in a correction signal generator 13 is positive. Thus, an output of a functional circuit becomes zero, and no correction signal is generated. If the received power becomes a target value or lower of the lowest received power, an output of the subtracter becomes negative, and a signal responsive to the value is outputted from the functional circuit. The correction signal is generated by a signal obtained by integrating the signal by an integrating amplifier, and a rotational speed command value of a governor 8 is reduced. Accordingly, the received power is recovered. The correction signal is increased until generating power is recovered to the target value of the lowest received power, and then maintained at its value after the recovery, and hence the received power can be held at the target value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a private power generator that is operated while being connected to a commercial power system while supplying power to a premises load.

[0002]

2. Description of the Related Art FIG. 1 shows a control system for a private power generator operated in connection with a commercial power system while supplying power to a premises load.
There is a private power generation system shown in FIG. In the figure, 1 is a generator, 2 is a prime mover, 3 is a premises load, 4 is a commercial power system,
5 is a generator breaker, 6 is a load breaker, 7 is a power receiving breaker,
8 is a governor, 9 is a reference setter, 10 is a reference up switch, and 11 is a reference down switch.

[0003] Now, the generator 1 is driven by the prime mover 2 to generate electric power, and the generated electric power is consumed as load electric power by the local load 3 via the generator circuit breaker 5 and the load circuit breaker 6. The shortage of the load power in the power generated by the generator 1 is supplied from the interconnected commercial power system 4 via the power receiving circuit breaker 7.

[0004] Except for a case where a special protective relay is installed, a private power generator cannot generally cause reverse power flow to a commercial power system. The power received from the commercial power system must be zero or more. Therefore, when the on-premise load 3 is small, the electric power of the generator 1 is restricted so that the reverse power flow does not occur.

The governor 8 controls the power of the generator 1. The governor 8 controls the rotation speed of the prime mover 2, but has a droop characteristic that causes the rotation speed of the prime mover to drop in accordance with the output of the prime mover, that is, the generated power. Governor 8
Is the command value of the generated power. Governor 8
Is determined by the reference setting device 9. To change the rotation speed reference value, the reference setter 9 is switched on by the reference up switch 10 or the reference down switch 11.
Is performed by giving an operation pulse having a width corresponding to. The rotation speed reference value changes by an amount corresponding to the time length of the operation pulse. The generated power changes equal to the change in the rotation speed reference value. Usually, the operation pulse is given intermittently. The characteristics at that time are shown by the solid lines in FIG. In the case where the generated power is to be greatly changed quickly, a continuous pulse is used as shown by a broken line in FIG. By operating the generated power in this way, when the load power decreases, the generated power is also reduced to maintain the received power at zero or more.

[0006]

However, in the conventional private power generator, when a part of the load on the premises stops operating and the load power decreases stepwise, there is a problem that a reverse power flow is likely to occur. This is because the generator 1 continuously tries to supply constant power even when the load power changes stepwise. If the load power becomes smaller than the generated power, a reverse power flow occurs at that moment. When the change in load power is slow, it can be dealt with by reducing the generated power by an operation as shown in FIG. 14, but it cannot cope with a stepwise change. Even if the generated power is reduced by continuous pulses as shown by the broken line in FIG. 14, the reverse power flow continues for a time corresponding to the amount of the reverse power flow.

[0007] At the receiving point of the consumer, a reverse power relay is installed that trips the power receiving circuit breaker 7 and stops power receiving when the reverse power flow continues for a predetermined time or more. The trip of the power receiving circuit breaker 7 may extend to a total power failure in the premises and is not allowed. Conventionally, a step change amount of a load predicted as a method for preventing the change is calculated, and even if a maximum step change occurs, a predetermined predetermined value is set so that the received power recovers to zero or more within the operation time limit of the reverse power relay. A driving operation to secure the received power of the value was performed.

[0008] Having a private power generator means reducing the power cost by replacing the power from the commercial power system with inexpensive generated power, and it is desirable that the received power during operation be as close to zero as possible. However, as described above, the operation of always securing the received power equal to or higher than the predetermined value has been a serious problem that the economical efficiency of the private power generator is deteriorated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control device for a private power generation device capable of speeding up control of generated power and minimizing received power from a commercial power system. .

[0010]

According to a first aspect of the present invention, there is provided a generator, a prime mover for driving the generator, and a governor for controlling a rotation speed of the prime mover.
A reference setter for setting a reference value of the number of revolutions of the prime mover, a control device for a private power generator that interconnects the generator with a commercial power system and supplies power to a premises load; Power detector that detects the received power to be received, a received power setter that sets the target value of the minimum received power, and a correction signal generator that generates a correction signal for the rotation speed of the prime mover from the received power and the target value of the minimum received power And an adder that adds the correction signal and the rotation speed reference value, and a limiter that limits upper and lower limits of an output signal of the adder and sets a rotation speed command value to the governor. When the received power falls below a target value of the minimum received power, the power generation of the generator is reduced by the correction signal that operates to reduce the rotation speed command value according to the difference power.

According to a second aspect of the present invention, in the control device for an in-house power generator according to the first aspect, the correction signal generator calculates a difference between the received power and a minimum received power target value, and the subtractor When the output is positive, the function circuit outputs a value corresponding to the output of the subtractor when the output is positive, and an amplifier amplifies the output of the function circuit.

According to a third aspect of the present invention, in the control device of the private power generator according to the second aspect, the amplifier is an amplifier having an integrating action. Claim 4 of the present invention
According to a third aspect of the present invention, the amplifier having an integral action is an amplifier having a self-discharge characteristic of an integral amount.

According to a fifth aspect of the present invention, in the control device of the private power generator according to the first to fourth aspects, the command value of the number of revolutions to the governor is a rate of change of a signal provided before or after the limiter. Is input through a rate limiter that limits

According to a sixth aspect of the present invention, in the control device of the private power generator according to the fifth aspect, the rate limiter can separately set a change rate limit value of a signal for increasing or decreasing the rotational speed command value. It is characterized by having such a configuration.

According to a seventh aspect of the present invention, there is provided a control device for an in-house power generator according to the first to sixth aspects, wherein a lock circuit for locking an operation of changing a rotation speed reference value of a reference setting device is added and corrected. While the signal is being output from the signal generator or for a predetermined time from the start of the output, the increase or decrease of one or both of the rotation speed reference values of the reference setting device is locked.

According to an eighth aspect of the present invention, in the control device for an in-house power generator according to any one of the first to seventh aspects, a reference setting device capable of presetting a reference value is provided instead of the reference setting device and the adding circuit. A rotation speed reference value is preset to a correction signal value calculated when the received power falls below the minimum received power target value.

According to a ninth aspect of the present invention, in the control device for an in-house power generator according to the eighth aspect, in order to preset the reference setting device, the reference setting device sets the rotation speed reference value faster than a normal setting change rate. A reference setter provided with an auxiliary signal input terminal for reducing the power, and driving the auxiliary signal input terminal when the received power is small by the output of the determiner for determining the magnitude of the received power and the minimum received power target value. I do.

According to a tenth aspect of the present invention, in the control device for an in-house power generator according to the fifth to ninth aspects, a generated power detector for detecting the generated power of the generator is provided. A rate limit value calculation circuit for determining a rate limit value of the rate limiter by a function determined in advance from the detected power value is provided.

According to an eleventh aspect of the present invention, in the control device for an in-house power generator according to the first to tenth aspects, a governor corrector for correcting nonlinearity of a governor droop characteristic is provided before the signal input to the governor. , And the rotation speed command value and the generator output active power characteristic are linearized.

According to a twelfth aspect of the present invention, in the control apparatus for a private power generator according to any one of the first to eleventh aspects, a plurality of generators, a prime mover, a governor, and a reference setter associated with each of the generators are provided. And, if there is a limiter and a generated power detector, these limiters and generated power detectors are also provided for each of the generators, and the value of the correction signal is distributed to and controlled by each of the generators. .

According to a thirteenth aspect of the present invention, in the control device of the private power generator according to the first to twelfth aspects, at least a part of the control device components is realized by software of a microcomputer. I do.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a control device of a private power generator according to a first embodiment (corresponding to claims 1 to 3) of the present invention.

The present embodiment is different from the conventional control system of the private power generator shown in FIG. 13 in that a receiving power detector 15 for detecting the receiving power received from the commercial power system 4 and a voltage for the receiving power detector 15 are provided. Detection transformer 16 and current detection CT1
7, a received power setting unit 14 for setting a target value of the minimum received power, a correction signal generator 13 for generating a correction signal for the prime mover rotation speed from the target values of the received power and the minimum received power, a correction signal and a rotation speed. The difference is that an adder 12 that adds a reference value and sets a rotational speed command value to the governor 8 and an upper / lower limiter 18 are added, and the other components are the same. The description is omitted.

FIG. 2 shows an example of the configuration of the correction signal generator 13, wherein 100 is a subtractor, 101 is zero when the output of the subtractor 100 is positive, and is a value corresponding to the output of the subtractor 100 when the output is negative. Is an amplifier for amplifying the output of the function circuit 101. Here, an integrating amplifier is used.

Next, the operation of this embodiment will be described.
When the received power detected by the received power detector 15 is larger than the target value of the minimum received power, the output of the subtractor 100 in the correction signal generator 13 is positive. Therefore, the function circuit 1
The output of 01 becomes zero and no correction signal is generated. When the received power falls below the minimum received power target value, the subtractor 10
The output of 0 becomes negative, and a signal corresponding to the value becomes a function circuit 10.
1 is output. A correction signal is generated by a signal obtained by integrating this signal by the integrating amplifier 102, and the rotation speed command value of the governor 8 is reduced, so that the generated power is also reduced and the received power is recovered. The correction signal is increased by the operation of the integrating amplifier 102 until the received power is restored to the target value of the minimum received power, and the value is maintained after the recovery, so that the received power can stably maintain the target value.

FIG. 3 shows this state. That is, the broken line in the figure is an example in which the generated power is reduced by using the operation pulse as a continuous pulse in the conventional control device, and the solid line is an example in which the control device of the present embodiment performs the operation. High-speed control can be realized by correcting the rotation speed command value of the governor 8 by the analog signal portion.

Further, since the rotation speed command value given to the governor 8 by the limiter 18 in FIG. 1 is limited to a preset allowable value specific to each engine, the engine may be overloaded or underloaded. It is safe without becoming. Only one of the limit values may be set depending on the characteristics of the engine.

FIG. 4 is a block diagram of a correction signal generator 13A used in a control device of a private power generator according to a second embodiment (corresponding to claim 4) of the present invention. As shown in the figure, the correction signal generator 13A of this embodiment includes a polarity inversion circuit 131 for subtraction, an arithmetic circuit 132 in which an addition circuit and a function circuit for subtraction are combined, and an amplifier 133. ing. Since the amplifier 133 is a first-order delay amplifier, when the input becomes zero, the output becomes zero in a predetermined time period. In addition, it goes without saying that the discharge characteristics of the integral amount can be realized by various other circuits.

Since the correction signal generator 13 of the first embodiment shown in FIG. 3 employs the integrating amplifier 102, the correction signal is continuously output even after the generated power is reduced.
When it is better to withdraw the correction signal after a predetermined time from the recovery of the received power, for example, the setting range of the reference setting unit 9 that determines the rotation speed reference is narrow, and the change in the rotation speed command value due to the correction signal cannot be covered. There are cases. In such a case, instead of the complete integrating amplifier 102 as in the first embodiment,
The first-order lag amplifier 133 having the self-discharge characteristic of the integral amount as in this embodiment may be used.

FIG. 5 is a block diagram of a control device for a private power generator according to a third embodiment of the present invention (corresponding to claim 5). The configuration of this embodiment different from the first embodiment of FIG. The same components are denoted by the same reference numerals and description thereof is omitted.

As shown in the figure, in this embodiment, the output signal of the limiter 18 is not directly input to the governor 8 but is
A rate limiter 19 for limiting the rate of change is provided and configured to input via this.

According to the characteristics of the engine, a rapid change in the engine speed command value to the engine results in a rapid change in the amount of fuel, resulting in a loss of balance with the amount of intake air, and incomplete combustion and misfiring. Engine life,
Frequent maintenance may be required. Such a case can be dealt with by providing a rate limiter 19 that limits the rate of change of the rotation speed command value to the governor 8 as in the present embodiment. Although not particularly described in the present embodiment, the same effects as in the first embodiment can be obtained.

In this embodiment, the rate limiter 19 is provided between the limiter 18 and the governor 8 as described above.
Even if the rate limiter 19 is provided between the adder 12 and the limiter 18, the same effect as in the present embodiment can be obtained.

FIG. 6 is a block diagram of a control device for a private power generator according to a fourth embodiment of the present invention (corresponding to claim 6). This embodiment differs from the third embodiment in FIG. This is a configuration in which different setting values are set by the rate limit value setting device 20 and the deceleration rate limit value setting device 21, and other configurations are the same. Description is omitted.

Depending on the engine, the limit of the change rate of the rotational speed command value may be different between the direction in which the rotational speed command value is increased, that is, the fuel increasing direction, and the direction in which the rotational speed command value is reduced, that is, the fuel decreasing direction. In such a case,
This can be dealt with by providing the upward direction rate limit value setting unit 20 and the downward direction rate limit value setting unit 21 as in this embodiment, and setting them to different values. Although not particularly described in the present embodiment, the same effects as in the third embodiment can be obtained.

FIG. 7 is a block diagram of a control device for a private power generator according to a fifth embodiment of the present invention (corresponding to claim 7). The configuration of this embodiment different from the fourth embodiment of FIG. 22
Are added to the switches 23 and 23 while the correction signal is output.
The reference numeral 24 designates a configuration for locking the reference raising / lowering signal of the reference setting device 9, and other configurations are the same. Therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

As shown in the drawing, this embodiment employs a lock circuit 2
2 while the correction signal is being output.
The reference signals 3 and 24 lock the reference raising / lowering signal of the reference setting device 9. This locking method is a method of locking with both switches 23 and 24 while the correction signal is being output, a method of locking for a predetermined time after the output of the correction signal is started, or if the correction signal is in the direction of increasing the rotational speed command value. A lock method using only the switch 23 and only the switch 24 in the downward direction may be used.

In the above-described first to fourth embodiments, the operation of reducing the generated power by the correction signal and the reference setting switch 9 or the reference lowering switch 11 are used to set the reference setting device 9.
In some cases, the operation of changing the rotation speed reference value may be in opposition. When the reference raising switch 10 and the reference lowering switch 11 are operated by the power controller of the generator (not shown) and the power generation control is constant, if the correction signal becomes a signal in the direction of decreasing the rotation speed, the power controller conversely reduces the power generation. Activate the reference raising switch to maintain it. This operation is problematic when priority is given to the correction signal.

In the case of such a problem, a lock circuit 22 is added as in the present embodiment, and the switches 23 and 24 are used to lock the reference raise / lower signal of the reference setter 9 while the correction signal is being output. it can. Although not particularly described in the present embodiment, the same effects as in the first to fourth embodiments can be obtained.

FIG. 8 is a block diagram of a control device for a private power generator according to a sixth embodiment of the present invention (corresponding to claim 8). The configuration of this embodiment different from the fourth embodiment of FIG. And a reference setting unit 25 capable of presetting an output reference value is added. Since other configurations are the same, the same components are denoted by the same reference numerals and description thereof is omitted.

As shown in the figure, the present embodiment is provided with a reference setter 25 capable of presetting a reference value of an output by an external signal. The reference setter 25 is a device that outputs an integrated value of an input operation pulse, and has an integrator therein.
When the received power falls below the minimum received power target value, the integral value is preset with a correction signal corresponding to the difference, so that the integrating amplifier 10 in the correction signal generator 13 can be used.
2 can be omitted. The correction part is an analog signal part, and enables high-speed generation power reduction. Although not particularly described in the present embodiment, the same effects as in the fourth embodiment can be obtained.

FIG. 9 is a block diagram of a control device for a private power generator according to a seventh embodiment (corresponding to claim 9) of the present invention. As shown in the drawing, this embodiment is different from the fourth embodiment in FIG. 6 in that, in place of the reference setter 9 and the correction signal generator 13, a judgment is made to determine the magnitude of the received power and the minimum received power target value. Vessel 26
And a reference setter 27 provided with an auxiliary signal input terminal for reducing the rotation speed reference value faster than the normal setting change rate.
And an auxiliary switch 28 for driving an auxiliary signal input terminal. Since the other configuration is the same, the same components are denoted by the same reference numerals and description thereof will be omitted.

As shown in the figure, the present embodiment is configured so that the output of the reference setter 25 can be preset when high speed is not required as much as correction by an analog circuit. Can respond. Although not particularly described in the present embodiment, the same effects as in the fourth embodiment can be obtained.

FIG. 10 shows an eighth embodiment of the present invention.
FIG. 10 is a configuration diagram of a control device of the in-house power generation device (corresponding to FIG. 5). This embodiment is different from the third embodiment in FIG. This is a configuration in which the limit value calculation circuit 32 is added, and the other configuration is the same. Therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

Normally, the private power generator connected to the commercial power system is operated at the rated generated power. Therefore, the rate control value of the rate limiter 19 may be a fixed value, which simplifies the configuration. However, some devices operate while changing the generated power. In this case, the rate of change based on the number of revolutions allowed by the engine also changes according to the amount of the generated power.

The present embodiment can cope with a case where the rate of change based on the number of revolutions permitted by the engine also changes according to the amount of generated power as described above. That is, the generated power is converted into the generated power detector 29 and the voltage detection transformer 3 for the same.
0 is detected by a current detection CT 31, a rate limit value is calculated by a rate limit value calculation circuit 32 according to a predetermined pattern, and set in a rate limiter 19. Although not particularly described in the present embodiment, the same effects as in the third embodiment can be obtained.

FIG. 11 shows a ninth embodiment of the present invention.
FIG. 10 is a configuration diagram of a control device of the in-house power generation device (corresponding). The configuration of the present embodiment that differs from the third embodiment of FIG. 5 is that a governor corrector 33 is added, and the other configurations are the same. Therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

In a general governor, the droop characteristic has a characteristic substantially proportional to the output active power of the generator. However, in a governor having strong nonlinearity, the change in the rotation speed command value is not proportional to the output active power of the generator.

In this embodiment, in order to correct the droop characteristic, the governor corrector 33 compensates for the nonlinearity of the governor droop characteristic. The governor corrector 33 has a function of the reciprocal of the governor droop characteristic and linearizes from the rotation speed command value of the rate limiter output to the generator output active power.

Therefore, according to the present embodiment, even when a plurality of generators are operated in parallel and governor characteristics are different, the output active power of each generator can be balanced. If the droop characteristic of the governor is linear, the output active power of each generator can be balanced without the governor corrector. Although not specifically described in the present embodiment,
The same effects as in the third embodiment can be obtained.

FIG. 12 shows a tenth embodiment of the present invention.
5 is a configuration diagram of a control device of the in-house power generation device (corresponding to 2). This embodiment is different from the third embodiment in FIG. 5 in that the same power generation set is provided in two systems. Since the configuration is the same, the same components are denoted by the same reference numerals and description thereof will be omitted.

As shown in the figure, this embodiment is an example of two generators. The first power generation set has the same configuration as the third embodiment. The second power generation set includes a second generator 1a, a second prime mover 2a, a second generator breaker 5a, a second governor 8a, a second reference setter 9a, and a second It comprises a reference raising switch 10a, a second reference lowering switch 11a, a second adder 12a, a second limiter 18a, and a second rate limiter 19a.

Further, both power generation sets have a commercial power system 4
Power detector 15 for detecting the received power received from
A voltage detection transformer 16 and a current detection CT 17 for the received power detector 15, a received power setter 14 for setting a target value of the minimum received power, and a correction of the rotation speed of the prime mover from the target values of the received power and the minimum received power. The correction signal generator 13 for generating a signal is configured to be common.

Since the present embodiment is configured as described above, the signal of the correction signal generator 13 can be distributed to each of the generators 1 and 1a. The operation of reducing the generated power can be the same. In this embodiment, the governor 8 or 8a has a linear droop characteristic. However, if the governor is strongly nonlinear, similar characteristics can be obtained by using the governor corrector shown in FIG. In addition, the present invention exerts the same effect regardless of whether it is a plurality of generators or a single generator.

In each of the embodiments described above, each block in the components is described as independent hardware. However, the present invention is not limited to this, and a part or all of the control device is realized by software of a microcomputer. It is also possible.

[0056]

As described above, the present invention (Claim 1)
According to claim 12), in the private power generator operated in connection with the commercial power system while supplying power to the premises load, the received power has become equal to or less than the minimum received power target value due to a sudden change in the premises load. Even in this case, since the analog signal portion of the rotation speed command value to the governor device can be corrected at a high speed, the generated power can be narrowed down at a high speed, and the received power can be promptly restored to the minimum received power target value or more. . In addition, it is possible to prevent the correction signal from affecting normal operation or generating too little power, or to support multiple generators, dramatically improving the stability of operation of the private power generator. It is possible to improve.

If the time required for the received power to return to or above the target value of the minimum received power can be shortened, the target value can be lowered. If the target value of the minimum received power can be reduced, the ratio of the power generated by the private power generator to the power consumed by the in-house load can be increased, which is economical.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a control device of a private power generation device according to a first embodiment.

FIG. 2 is a configuration diagram of a correction signal generator of FIG. 1;

FIG. 3 is a characteristic diagram showing a relationship between generated power, an operation pulse, and a correction signal in FIG. 1;

FIG. 4 is a configuration diagram of a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of a fifth embodiment of the present invention.

FIG. 8 is a configuration diagram of a sixth embodiment of the present invention.

FIG. 9 is a configuration diagram of a seventh embodiment of the present invention.

FIG. 10 is a configuration diagram of an eighth embodiment of the present invention.

FIG. 11 is a configuration diagram of a ninth embodiment of the present invention.

FIG. 12 is a configuration diagram of a tenth embodiment of the present invention.

FIG. 13 is a configuration diagram of a control device of a conventional private power generation device.

FIG. 14 is a characteristic diagram for explaining a conventional private power generator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Generator, 2 ... Prime motor, 3 ... Premise load, 4 ... Commercial power system, 5 ... Generator breaker, 6 ... Load breaker, 7 ... Power receiving breaker, 8 ... Governor, 9 ... Reference setter, 10 ... Reference raising switch, 11 ... Reference lowering switch, 12 ... Adder, 1
3, 13A: correction signal generator, 14: received power setting device,
15: Received power detector, 16: Voltage detection transformer, 17
... Current detection CT, 18 ... Limiter, 19 ... Rate limiter, 100 ... Subtractor, 101 ... Functional circuit, 102 ... Amplifier, 131 ... Polarity inversion circuit, 132 ... Operation circuit, 133
... amplifier, 20 ... increase rate limit value setting device, 21 ... decrease rate limit value setting device, 22 ... lock circuit, 23, 2
4 switch, 25 reference presetter that can be preset, 2
6 ... determiner, 27 ... reference setter provided with auxiliary signal input terminal, 28 ... auxiliary switch, 29 ... generated power detector, 30
... voltage detection transformer, 31 ... current detection CT, 32 ... rate limit value calculation circuit, 33 ... governor corrector, 1a ... second generator, 2a ... second prime mover, 5a ... second generator breaker, 8a: second governor, 9a: second reference setter, 1
0a: second reference raising switch, 11a: second reference lowering switch, 12a: second adder, 18a: second limiter, 19a: second rate limiter.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshimitsu Maeda 1000 Hamada, Aboshi-ku, Himeji-shi, Hyogo Nishishiba Electric Machinery Co., Ltd. (72) Inventor Takao Ogata 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd.

Claims (13)

[Claims] A generator for driving the generator, a governor for controlling a rotation speed of the motor, and a reference setting device for setting a rotation speed reference value of the motor. In the control device of the private power generator that supplies power to the premises load in conjunction with the commercial power system, a received power detector that detects received power received from the commercial power system,
A received power setting device that sets a target value of the minimum received power, a correction signal generator that generates a correction signal of the prime mover rotation speed from the received power and the target value of the minimum received power, and the correction signal and the rotation speed reference value. An adder to be added, and a limiter that limits the upper and lower limits of the output signal of the adder and sets a rotation speed command value to the governor, and when the received power falls below a target value of the minimum received power, the difference is determined. A control device for a private power generator, wherein the power generated by the generator is reduced by the correction signal that operates so as to reduce a rotation speed command value according to power. 2. The private power generator control device according to claim 1, wherein the correction signal generator is configured to calculate a difference between the received power and the minimum received power target value, and when the output of the subtractor is positive. Wherein the control circuit comprises a function circuit for outputting a value corresponding to the output of the subtractor when the value is zero or negative, and an amplifier for amplifying the output of the function circuit. 3. The control device for a private power generator according to claim 2, wherein the amplifier is an amplifier having an integral action. 4. The control device for a private power generator according to claim 3, wherein the amplifier having an integral action is an amplifier having a self-discharge characteristic of an integral amount. 5. The control device for a private power generator according to claim 1, wherein the command value for the number of revolutions to the governor is a rate limiter provided for limiting a change rate of a signal provided before or after the limiter. A control device for a private power generation device, wherein the control device is configured to input the information via a personal computer. 6. The control device for an in-house power generator according to claim 5, wherein the rate limiter is configured to separately set a change rate limit value of a signal for increasing or decreasing the rotation speed command value. A control device for a private power generator. 7. A control device for a private power generator according to claim 1, further comprising a lock circuit for locking an operation of changing a rotation speed reference value of a reference setting device, wherein a signal is output from a correction signal generator. A control device for an in-house power generation device, which locks an increase and / or a decrease in a rotation speed reference value of the reference setting device during output or for a predetermined time from the start of output. 8. A control device for a private power generator according to claim 1, further comprising a reference setter capable of presetting a reference value instead of the reference setter and the adding circuit, wherein the received power is the minimum received power. A control device for a private power generator, wherein a rotation speed reference value is preset to a correction signal value calculated when a value falls below a target value. 9. The control device for an in-house power generator according to claim 8, wherein the reference setting device presets the reference setting device, wherein the reference setting device reduces the rotation speed reference value faster than a normal setting change rate. Control of the private power generator, characterized in that the auxiliary signal input terminal is driven when the received power is small based on the output of the determiner that determines the magnitude of the received power and the minimum received power target value as a reference setter having terminals. apparatus. 10. The control device for a private power generator according to claim 5, further comprising a generated power detector for detecting the generated power of the generator, wherein the generated power detector is determined in advance based on the detected generated power of the generated power detector. A rate limit value calculation circuit for determining a rate limit value of the rate limiter using a function provided by the control device. 11. A control device for a private power generator according to claim 1, wherein a governor corrector for correcting non-linearity of a governor droop characteristic is installed at a stage before a signal input to the governor, and A control device for a private power generator, wherein a command value and a generator output active power characteristic are linearized. 12. The control device for a private power generator according to claim 1, further comprising a plurality of generators, a prime mover, a governor, and a reference setting device associated with each of the generators, and If there is a generated power detector, the limiter and the generated power detector are also provided for each of the generators, and the value of the correction signal is distributed to and controlled by each of the generators. . 13. The control device for a private power generator according to claim 1, wherein at least a part of the control device components is realized by software of a microcomputer. apparatus.