JP4095508B2 - Warm-up time reduction device - Google Patents

Description

  The present invention relates to a warm-up operation time shortening device for an engine-driven generator capable of grid interconnection (hereinafter referred to as “system interconnection engine-driven generator”).

In a grid-connected engine-driven generator (particularly, a grid-connected engine-driven generator with an automatic operation / stop function), a warm-up operation is performed for a predetermined time after the engine that drives the generator is started. For example, in this warm-up operation, a predetermined constant warm-up operation time of 2 minutes for low-speed operation, and then about 5 minutes for high-speed rated operation, and until the cooling water temperature of the engine reaches a predetermined temperature or more. It is performed in a no-load state over any one of the short times (for example, see Patent Document 1).
JP 7-42581 A ([0010]-[0026], FIGS. 1-2)

The warm-up operation time requires a long time in winter when the engine coolant temperature is low, but is short in summer when the engine coolant temperature is high. However, the warm-up operation time is set by a timer attached to the grid-connected engine-driven generator. However, if the set time is changed in consideration of the temperature conditions of each period, the work is There was a problem of becoming complicated.
Further, since the warm-up operation is performed in a no-load state, there is a problem that the time and fuel required for the warm-up operation are wasted.

  The present invention has been made in order to solve the above-described problem, and it is a system interconnection engine drive generator capable of shortening the warm-up operation time performed in a no-load state and increasing the supply power. An object of the present invention is to provide a warm-up operation time shortening device.

  In order to solve the above-mentioned problems, the present invention rectifies the output of a generator driven by an engine by rectifying means, converts the rectified output into AC power having a specified voltage and a specified frequency by an inverter device, and outputs the AC power An apparatus for shortening a warm-up operation time in an engine drive generator for interconnection, wherein the coolant temperature detection means detects the coolant temperature of the engine, the current detection means detects the output current of the inverter device, and the cooling Inverter control means for controlling the output of the inverter device based on the detected current detected by the current detecting means when the detected cooling water temperature detected by the water temperature detecting means is equal to or lower than a preset temperature. And the inverter control means includes a cooling water temperature range for each of a plurality of predetermined cooling water temperature ranges that are predetermined below the set temperature. The limit current value is set in stages so that the water temperature range increases as the temperature increases, and the limit current value of the inverter device is maintained so that the limit current value is maintained as the detected cooling water temperature increases. It is characterized in that it is configured to be able to perform control to increase the output current stepwise.

  Further, the present invention rectifies the output of a generator driven by an engine by a rectifying means, converts the rectified output into AC power having a specified voltage and a specified frequency by an inverter device, and outputs the AC power for grid interconnection. A device for shortening a warm-up operation time in a machine, wherein a coolant temperature detection means for detecting a coolant temperature of the engine, a current detection means for detecting an output current of the inverter device, and an output voltage of the inverter device are detected Voltage detection means that detects the detected current detected by the current detection means and the voltage detection means when the detected cooling water temperature detected by the cooling water temperature detection means is equal to or lower than a preset temperature. And an inverter control means for controlling the output of the inverter device based on the detected voltage. The limit power value is set stepwise so that the cooling water temperature range increases as the temperature rises for each of a plurality of predetermined cooling water temperature ranges below the temperature. It is configured to be able to perform control to increase the output power of the inverter device step by step so that the limit power value is maintained as the water temperature rises. .

  According to the present invention, in the inverter control means, the current limit value is set so that the cooling water temperature range increases as the cooling water temperature range becomes higher for each of a plurality of predetermined cooling water temperature ranges below the set temperature. Alternatively, the limit power value is set stepwise, and the output current or output power of the inverter device is stepwise so that the limit current value or limit power value is maintained as the detected cooling water temperature increases. Therefore, the warm-up operation time can be automatically shortened according to the detected coolant temperature. Moreover, since it can output as much as possible in the range which does not exceed a limit electric power value according to detected coolant temperature, power generation efficiency can be improved.

  A best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the drawings.

[Constitution]
(1) Engine interconnection generator for grid interconnection As shown in FIG. 1, an engine drive generator for grid interconnection 1 equipped with the warm-up operation time shortening device of the present invention includes a generator G driven by an engine E, Rectifying means REC for rectifying the AC output voltage of the generator G and outputting a DC voltage; inverter device IV for converting the DC voltage into AC power having a specified voltage and a specified frequency; and engine control means 20 And an inverter control means 30, a current detector 41 (current detection means), and a voltage detector 42 (voltage detection means).
The grid-connected engine-driven generator 1 is connected in parallel with the commercial power source 2 via the first circuit breaker CB1 and the second circuit breaker CB2, both of which are loaded via the third circuit breaker CB3. It is connected to the device 3.

(2) Warm-up operation time shortening device The warm-up operation time shortening device includes an engine control means 20, an inverter control means 30 for controlling the output of the inverter device IV, a current detector 41, a voltage detector 42, and a water temperature. The sensor 51 (cooling water temperature detection means) is the main part.

A radiator R is connected to the engine E, a water temperature sensor 51 (cooling water temperature detecting means) for detecting the cooling water temperature of the radiator R, and the cooling water temperature is not less than a set value (for example, 105 degrees). There is provided a water temperature switch 52 that is turned on in the case of turning off and turned off in case of being lower than the set value.
The water temperature sensor 51 can output a voltage proportional to the detected coolant temperature to an A / D (analog / digital) converter 22 a of a microcomputer 22 (hereinafter referred to as “microcomputer”) in the engine control means 20. .

The engine control means 20 has an engine governor control circuit 21 and a microcomputer 22 for controlling the engine governor control circuit 21.
The engine governor control circuit 21 outputs a start signal to the engine starter S based on an engine E start command signal issued from the microcomputer 22 to start the engine E, controls the engine speed, operates the engine E, and It is a circuit that controls various operations for stopping.
In addition to controlling the engine governor control circuit 21, the microcomputer 22 converts the input detected coolant temperature data into a digital value (hereinafter referred to as “detected coolant temperature data”) by the A / D converter 22a. While being able to output to the inverter control means 30, it is possible to control the engine E by detecting on / off of the water temperature switch 52.

The inverter device IV is configured as an IGBT (insulated gate bipolar transistor) 6 including a gate circuit 7. This inverter device IV can output AC power to the load device 3 by performing on / off control of the IGBT 6 by the gate circuit 7 in accordance with the gate signal transmitted from the inverter control means 30. In addition, code | symbol MC is an electromagnetic contactor.
Further, the current detector 41 and the voltage detector 42 are devices for detecting the output current and output voltage of the inverter device IV, respectively, and a voltage proportional to the detected output current and output voltage is the inverter control means 30 described later. Are output to the A / D converters 31 and 32.

The inverter control means 30 is constituted by a microcomputer, and sequentially reads and executes a program stored in a storage means (not shown), thereby performing a series of operations from setting of a limited power setting value, which will be described later, to ON / OFF of the IGBT 6. It is a means for executing control and controlling the output of the inverter device IV step by step.
The inverter control means 30 includes A / D converters 31 and 32 for converting the detected output current and the detected output voltage into digital values (hereinafter referred to as “detected current data” and “detected voltage data”, respectively). A detected cooling water temperature data receiving unit 33, an output power calculating unit 34, a limited power value storage unit 35, a limited power value setting unit 36, an output power determining unit 37, and a gate signal transmitting unit 38. ing.

The detected cooling water temperature data receiving unit 33 is a unit for receiving the detected cooling water temperature data transmitted from the engine control unit 20 and outputting it to the limit power value setting unit 36.
The output power calculation unit 34 is a means for calculating an actual output value of the inverter device IV from the detected current data and the detected voltage data output from the A / D converters 31 and 32.

The limit power value storage unit 35 is set in correspondence with the data of a predetermined plurality of categories of the cooling water temperature range that is predetermined below the set temperature value (40 degrees in the present embodiment) and the respective categories. The data of the limited power value is stored in association with each other. In the present embodiment, the grid-connected engine-driven generator 1 having a rated output of 10 kW is targeted, and is divided into five categories of coolant temperature ranges (0 degrees or less, 0 degrees to 10 degrees or less, 10 degrees to 20 degrees In the following, it is set to more than 20 degrees and less than 30 degrees, more than 30 degrees and less than 40 degrees), and for each cooling water temperature range, 0 kW so that the power limit value increases step by step as the temperature increases. (No load output) Limit power values of 2 kW, 4 kW, 6 kW, and 8 kW are set.
For the coolant temperature range in which the detected coolant temperature data exceeds the set temperature value, an output power set value of 10 kW, which is the total output, is set.

When the detected coolant temperature data is lower than the set temperature value, the limit power value setting unit 36 receives detected coolant temperature data from a plurality of limit power value data stored in the limit power value storage unit 35. The limit power value data corresponding to the coolant temperature range to which the detected coolant temperature data output from the unit 33 belongs is extracted (hereinafter, the extracted limit power value is referred to as “limit power set value” to be distinguished) ), Means for outputting to the output power determination unit 37.
The output power determination unit 37 compares the limit power set value extracted by the limit power value setting unit 36 with the actual output power value so that the actual output power value of the inverter device IV matches the limit power set value. It is a means for judging whether or not the output power actual measured value is larger or smaller than the limit power set value if they do not coincide with each other.

The gate signal transmission unit 38 is a unit for generating an appropriate gate signal for performing predetermined on / off control on the IGBT 6 based on the determination result of the output power determination unit 37 and transmitting it to the gate circuit 7. .
That is, when the actual output power value matches the limit power setting value, the gate signal transmission unit 38 continues the output of the inverter device IV as it is, and the actual output power value is the limit power setting value. If the value is larger than the value, the output power of the inverter device IV is reduced, and if the actual output power value is smaller than the limit power setting value, each gate signal for increasing the output power of the inverter device IV is generated, It can be transmitted to the gate circuit 7.

[Operation]
The operation of the warm-up operation time shortening device will be described below with reference to FIG.
First, the second circuit breaker CB2 is turned on and the third circuit breaker CB3 is turned on.
Subsequently, the first circuit breaker CB1 is turned on, the engine E of the grid-connected engine drive generator 1 is started, the synchronization with the commercial power supply 2 is confirmed, and the electromagnetic contactor MC is turned on to connect Operation is started (S1). And the inverter control means 30 discriminate | determines the value after receiving the detected cooling water temperature data output from the water temperature sensor 51 of the engine E (S2), and controls the inverter apparatus IV as follows.

(1) When the detected cooling water temperature data is 0 degrees or less When the detected cooling water temperature data is 0 degrees or less (Yes in S3), a plurality of limit power values stored in the limit power value storage unit 35 are stored. The data of the limit power value corresponding to the cooling water temperature range is extracted from the data, and the limit power set value is set to 0 kW by the limit power value setting unit 36 (S3 ′). On the other hand, based on the detected current data and the detected voltage data detected by the current detector 41 and the voltage detector 42, the output power calculation unit 34 calculates the actual output power value of the inverter device IV.

  Then, the output power determination unit 37 compares the actual output power value with the limit power setting value (0 kW), and if the actual output power value matches the limit power setting value (Yes in S8), A gate signal is transmitted from the gate signal transmission unit 38 so as to continue the operation as it is, and the output of the inverter device IV is controlled. On the other hand, when the actual output power value is larger than the set limit power value (No in S8 and Yes in S9), the output of the inverter device IV is controlled so as to reduce the output power of the inverter device IV (S9 ').

(2) When the detected cooling water temperature data exceeds 0 degrees and is 10 degrees or less When the detected cooling water temperature data exceeds 0 degrees and is 10 degrees or less (No in S3 and Yes in S4), the same procedure as described above Thus, the limit power set value is set to 2 kW (S4 ′).
If the actual output power value of the inverter device IV matches the limit power setting value (2 kW) (Yes in S8), the output of the inverter device IV is controlled so that the operation is continued as it is. To do. On the other hand, when the actual output power value is larger than the limit power set value (No in S8 and Yes in S9), the output power of the inverter device IV is lowered (S9 '), and the actual output power value is smaller than the limit power set value. In the case (No in S8 and No in S9), the output of the inverter device IV is controlled so as to increase the output power of the inverter device IV (S9 ″).

(3) When the detected coolant temperature data exceeds 10 degrees and is 20 degrees or less, when the detected coolant temperature data exceeds 20 degrees and is 30 degrees or less, and when the detected coolant temperature data exceeds 30 degrees and is 40 degrees or less In these cases ([No of S3 and No of S4 and Yes of S5], [No of S3 and No of S4 and No of S5 and Yes of S6], [No of S3 and No of S4 and No of S5] And No of S6 and Yes of S7]), as described above, the output power actual measurement value of the inverter device IV is set to the limit power set value (4 kW [S5 ′] set for each cooling water temperature range, respectively. ), 6 kW [S 6 ′], 8 kW [S 7 ′]), and if it matches the limit power set value (Yes in S 8), the operation is continued as it is. Output of inverter device IV To control. On the other hand, when the actual output power value is larger than the limit power set value (No in S8 and Yes in S9), the output power of the inverter device IV is lowered (S9 '), and the actual output power value is smaller than the limit power set value. In the case (No in S8 and No in S9), the output of the inverter device IV is controlled so as to increase the output power of the inverter device IV (S9 ″).

(4) When the detected cooling water temperature data exceeds 40 degrees When the detected cooling water temperature data exceeds 40 degrees (No in S3, No in S4, No in S5, No in S6 and No in S7) The power setting value is set to 10 kW (all outputs) (S7 "). Therefore, when the actual output power value is all outputs (Yes in S8), the operation is continued as it is. On the other hand, when the actual output power value is smaller than the total output (No in S8 and No in S9), the output of the inverter device IV is increased so as to increase the output power of the inverter device IV. The output is controlled (S9 ″).

  Thus, according to the warm-up operation time shortening device of the present invention, the power limit value is set so that the cooling water temperature range gradually increases as the cooling water temperature range becomes higher for each of the predetermined plural cooling water temperature ranges. It is set in a stepwise manner, and it is possible to perform a control for increasing the output power of the inverter device IV in a stepwise manner so that the limit power value is maintained in accordance with an increase in the detected cooling water temperature. It is configured. Therefore, the warm-up operation time can be automatically shortened according to the detected cooling water temperature regardless of the temperature condition of each period. In addition, since it is possible to output as much as possible within the range that does not exceed the limit power value according to the detected coolant temperature, without causing the warm-up operation to be performed without load regardless of the detected coolant temperature, the power generation efficiency is reduced. Can be improved.

  In the embodiment, the inverter control means 30 is based on the actual output power value calculated from the detected current detected by the current detector 41 and the detected voltage detected by the voltage detector 42. The output is controlled. However, based on only the detected current detected by the current detector 41, the inverter control means 30 determines the cooling water temperature range for each of a plurality of predetermined cooling water temperature ranges below the set temperature. You may control the output of the inverter apparatus IV so that the limiting current value set so that it may increase as it becomes high temperature may be maintained.

As mentioned above, although an example about a suitable embodiment was explained about the present invention, the present invention is not restricted to the embodiment concerned, and a design change is possible suitably in the range which does not deviate from the meaning of the present invention. In particular, the set value of the cooling water temperature, the cooling water temperature range and the number of divisions thereof, and each power limit value (limit current value) are appropriately determined according to the rated output of the grid-connected engine drive generator. Needless to say.
Further, the inverter control means is configured to be controlled by a microcomputer, but may be controlled by other methods.

It is a block diagram of the engine drive generator for grid connection. It is a flowchart which shows operation | movement of a warming-up operation time shortening apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine drive generator for grid connection 20 Engine control means 21 Engine governor control circuit 22 Microcomputer (microcomputer)
30 Inverter Control Unit 34 Detected Power Calculation Unit 35 Limit Power Value Storage Unit 36 Limit Power Value Setting Unit 37 Output Power Determination Unit 38 Gate Signal Transmitter 41 Current Detector (Current Detection Unit)
42 Voltage detector (voltage detection means)
51 Water temperature sensor (cooling water temperature detection means)
E Engine G Generator IV Inverter REC Rectifier

Claims (2)

Warm-up operation time in the grid-connected engine-driven generator that rectifies the output of the generator driven by the engine by the rectifier and converts the rectified output into AC power of the specified voltage and specified frequency by the inverter device. A shortening device,
Cooling water temperature detecting means for detecting the cooling water temperature of the engine;
Current detecting means for detecting an output current of the inverter device;
Inverter control means for controlling the output of the inverter device based on the detected current detected by the current detecting means when the detected cooling water temperature detected by the cooling water temperature detecting means is equal to or lower than a predetermined set temperature; With
In the inverter control means,
For each of a plurality of predetermined predetermined coolant temperature ranges below the set temperature, the limit current value is set stepwise so that the coolant temperature range increases as the temperature increases.
It is configured to be able to perform control to increase the output current of the inverter device in a stepwise manner so that the limit current value is maintained as the detected cooling water temperature increases. A feature to shorten the warm-up operation time. Warm-up operation time in the grid-connected engine-driven generator that rectifies the output of the generator driven by the engine by the rectifier and converts the rectified output into AC power of the specified voltage and specified frequency by the inverter device. A shortening device,
Cooling water temperature detecting means for detecting the cooling water temperature of the engine;
Current detecting means for detecting an output current of the inverter device;
Voltage detection means for detecting an output voltage of the inverter device;
Based on the detection current detected by the current detection means and the detection voltage detected by the voltage detection means when the detected cooling water temperature detected by the cooling water temperature detection means is equal to or lower than a predetermined set temperature. Inverter control means for controlling the output of the inverter device,
In the inverter control means,
The limit power value is set stepwise so that the cooling water temperature range increases as the cooling water temperature range becomes higher for each of a plurality of predetermined cooling water temperature ranges that are set in advance below the set temperature.
It is configured to be able to perform control to increase the output power of the inverter device step by step so that the limit power value is maintained as the detected coolant temperature rises. A feature to shorten the warm-up operation time.

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