JP2013040833A - Testing apparatus and testing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a testing apparatus and a testing method capable of efficiently evaluating influence on a power distribution system in an approximately actual state.SOLUTION: The testing apparatus includes a distribution line side voltage simulation device, a distribution line simulation circuit, a voltage detector, a voltage command generator, a conversion device, and a three-phase current amplifier. The distribution line side voltage simulation device generates a voltage obtained by reducing a distribution line side voltage of a transformer for actual power distribution at specified magnification. The distribution line simulation circuit is connected to the distribution line side voltage simulation device and electrically simulates a loss amount of power corresponding to the length of an actual distribution line. The voltage command generator is connected to the distribution line simulation circuit, includes a connection terminal connected to a tested device to be actually tested and generates a voltage command value from a voltage value of the distribution line simulation circuit detected by the voltage detector. The conversion device converts an inputted AC voltage into a three-phase AC voltage in accordance with the voltage command value and outputs the three-phase AC voltage from the connection terminal.

Description

  Embodiments of the present invention are designed to continuously operate a distributed power source that uses natural energy linked to a power distribution system, a load device in a customer, and a power distribution system under a variety of system conditions for a predetermined period of time. The present invention relates to a test apparatus and a test method for testing at cost.

  As a conventional test apparatus, Patent Document 1 discloses a test apparatus that can perform a comprehensive operation test of a distribution device by simulating various distribution systems.

  The test apparatus disclosed in Patent Document 1 performs a comprehensive operation test of a distribution device arranged in an arbitrary distribution system, and simulates a power supply unit that simulates a power supply, a substation unit that simulates a substation, and a distribution line. And a load unit that simulates a load.

  This test apparatus forms a power distribution system simulation circuit that simulates an arbitrary power distribution system by appropriately combining power supply units, substation units, distribution line units, and load units and connecting them with appropriate wiring. For example, a segment switch and a switch slave station that controls the segment switch are connected as equipment, and a comprehensive operation test of the segment switch and the switch slave station is performed.

  Further, Patent Document 2 discloses a test apparatus for an actual device that connects an actual device that is used by being connected to the distribution system to a power distribution system that can be tested in a space-saving and low-cost manner.

  An active power interface provided between a distribution system simulation circuit simulating a distribution system with an electronic circuit and an actual device, a voltage sensor and a current sensor for detecting the voltage and current on the actual device side, and the voltage VR and current IR are expressed as n Voltage control unit that controls the voltage (n / m) VR and current (N / M) IR multiplied by / m times and N / M times to be the voltage and current on the distribution system simulation circuit side, and the distribution system simulation circuit side The voltage sensor and current sensor for detecting the voltage and current, and the voltage (m / n) VS and the current (M / N) IS obtained by multiplying the voltage VS and current IS by m / n and M / N, respectively, are the voltage VR. And a current control unit that controls the current IR.

  Patent Document 3 discloses a test apparatus that can experimentally test the operation of a power distribution system interconnected with distributed power sources over a predetermined period.

  The sending voltage adjusting unit supplies the sending voltage to the simulated power distribution system. The plurality of distribution lines represent the overhead lines used as the distribution lines by a simulated equivalent circuit. The plurality of switches are connected between the delivery voltage adjusting unit and the plurality of distribution lines and between the plurality of distribution lines. The measurement unit measures values related to voltage and current in a power distribution system including a plurality of load circuits, a distributed power supply unit, a delivery voltage adjustment unit, a wiring line, a switch, a load circuit, and a distributed power output unit. The control unit controls the power distribution system to perform a test based on the calculated values related to the voltage and current from the measurement unit.

JP-A-8-205334 JP 2005-134280 A JP 2008-8766 A

  The conventional test apparatus disclosed in Patent Document 1 does not disclose a test apparatus for testing a distributed power source or a storage battery, but influences or effects on the distribution system due to the grid connection of the distributed power source or the storage battery. There is no description in terms of verification.

  Moreover, although the said patent document 2 is disclosing about the test apparatus which directly connects and tests the real device of a photovoltaic power generation system to the power distribution system simulation circuit comprised with the electronic circuit, it is between an actual device and a power distribution system simulation circuit. Since the active power interface provided in the circuit is configured by an electronic circuit such as an operational amplifier or a resistor, there is a problem that it is impossible to perform a test in which an actual device having a large capacity is connected. Moreover, there is no disclosure of changing the setting conditions such as the load size and location of the distribution system simulation circuit, and there is a problem that it is not easy to test the actual device of the photovoltaic power generation system when the simulation conditions of the distribution system are changed.

  Further, the above-mentioned Patent Document 3 prescribes the operation of a distribution system in which a distributed power source is connected by connecting a distributed power output unit that simulates a distributed power output to a distribution line means that simulates a distribution system. There is a problem in that a test apparatus for testing in a period is disclosed, and a test in which a real device such as a distributed power source or a load apparatus is connected cannot be performed.

  The problem to be solved by the present invention is that a large-capacity distributed power source and a load device can be connected to a space-saving simulated power distribution system that can easily change the configuration and load conditions of the power distribution system. Easily change the connection points of the power supply and load device to the simulated power distribution system to the power distribution system by testing the distributed power supply and load device real equipment for a predetermined period, changing the output of the distributed power supply and load, etc. It is an object of the present invention to provide a test apparatus and a test method that can efficiently evaluate the influence of the above in an almost realistic manner.

  The test apparatus of the embodiment includes a distribution line side voltage simulation device, a distribution line simulation circuit, a voltage detector, a voltage command generator, a conversion device, a current detector, a current command generator, and a three-phase current amplifier. The distribution line side voltage simulation device generates a voltage obtained by reducing the distribution line side voltage of the actual distribution transformer by a specified magnification. The distribution line simulation circuit is connected to the distribution line side voltage simulation device and electrically simulates the amount of power loss according to the length of the actual distribution line. The voltage detector detects a voltage value of the distribution line simulation circuit. The voltage command generator is connected to the distribution line simulation circuit, has a connection terminal to which a device under test to be tested is connected, and generates a voltage command value from the voltage value detected by the voltage detector. The converter converts the input AC voltage into a three-phase AC voltage according to the voltage command value generated by the voltage command generator, and outputs it from the connection terminal. The current detector detects a current value flowing through the connection terminal. The current command generator generates a three-phase current command value from the current value detected by the current detector. The three-phase current amplifier inputs / outputs a three-phase current corresponding to the three-phase current command value to / from the distribution line simulation circuit.

It is a figure which shows the structure of the test apparatus of embodiment. It is a block diagram which shows an example of a distribution line simulation circuit. It is a block diagram which shows an example of a load distribution power supply simulation device.

  Hereinafter, embodiments will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of a test apparatus according to an embodiment.

  As shown in FIG. 1, the test apparatus of this embodiment includes a variable simulation voltage generator 1, a distribution line simulation circuit 2 that simulates a distribution line, and one or more that simulates electric input / output of a load or a distributed power source. Load distribution power supply simulation devices 3a, 3b, 3c, 3d, three-phase or single-phase voltage source 4, interconnection device 5, connection selection switch 6, single-phase transformer 7, and three-phase test object A three-phase device under test 8, a single-phase device under test 9 to be tested, and an operation management device 50.

  The variable simulation voltage generator 1 is a device that simulates the distribution line side voltage of the distribution transformer, and is a voltage obtained by reducing the actual distribution line side voltage of the distribution transformer at a magnification specified by the operation management apparatus 50. Functions as a distribution line side voltage simulation device. The variable simulation voltage generator 1 has a single-phase 200V or the like when the distribution line voltage of the actual distribution transformer is set to three-phase 6.6 kV and the magnification specified by the operation management device 50 is, for example, 1/33. Generate voltage.

  The distribution line simulation circuit 2 is connected between the variable simulation voltage generator 1, the interconnection device 10, and the device under test (such as the three-phase device under test 8 and the single-phase device under test 9). That is, the distribution line simulation circuit 2 is the length of the actual distribution line to be wired between the variable simulation voltage generator 1 and the device under test (such as the three-phase device under test 8 and the single-phase device under test 9). This is a circuit that electrically simulates the amount of power loss (power attenuation or power load) corresponding to the power loss. The distribution line simulation circuit 2 includes three distribution line simulation circuits 2a, 2b, and 2c.

  The load distribution power supply simulation devices 3a, 3b, 3c, and 3d are assumed to simulate a load and a distributed power supply in the area of each distribution line.

  The voltage source 4 is connected to the AC / DC converter 20 a in the interconnection device 5. When the AC / DC converter 20a is a single-phase converter, the voltage source 4 generates a single-phase alternating current. When the AC / DC converter 20a is a three-phase converter, the voltage source 4 generates a three-phase alternating current. The AC / DC converter 20b in the interconnection device 5 is a three-phase AC converter, and is connected to the single-phase transformer 7 by a three-phase AC.

  The connection selection switch 6 switches (selects) and connects the connection destinations of the interconnection device 5 and the three circuits 2 a, 2 b, and 2 c of the distribution line simulation circuit 2. That is, the connection selection switch 6 is a circuit changeover switch that switches between the distribution line simulation circuits 2a, 2b, and 2c. As a result, the resistance and reactance values of the distribution line simulation circuit 2 as a whole are varied.

  The single-phase transformer 7 is a circuit that interconnects a three-phase circuit and a single-phase circuit. The three-phase device under test 8 and the single-phase device under test 9 are actual devices to be tested or devices corresponding to actual devices.

  The operation management device 50 sets the test data in this test device, synchronizes the time between each circuit and device, collects and evaluates the measurement data during the test, controls the start / stop of the test, and controls the switching of the connection selection switch 6. The control operation is performed.

  Operation management device 50, variable simulation voltage generator 1, distribution line simulation circuits 2a, 2b, 2c, load distribution power simulation devices 3a, 3b, 3c, 3d, interconnection device 5, and connection selection switch 6 The three-phase device under test 8 to be tested and the single-phase device under test 9 are connected to each other via a communication line 60 such as a local network that can communicate information with each other. ing.

  The interconnection device 5 includes a conversion device 10, a current detector 11, a current command generator 12, a three-phase current amplifier 13, a voltage detector 14, and a voltage command generator 15.

  The interconnection device 5 has a connection terminal 5a to which devices under test (three-phase device under test 8 and single-phase device under test 9) are connected.

  The conversion device 10 converts the AC voltage input from the voltage source 4 into a three-phase AC voltage according to the voltage command value generated by the voltage command generator 15, and outputs it from the connection terminal 5a.

  The current detector 11 is connected to the connection terminal 5a and measures the current flowing through the connection terminal 5a. That is, the current detector 11 detects the current value flowing through the connection terminal 5a.

  The current command generator 12 generates a three-phase current command value from the current value measured (detected) by the current detector 11. The three-phase current amplifier 13 inputs / outputs a three-phase current corresponding to the three-phase current command value to / from the distribution line simulation circuits 2a, 2b, and 2c.

  The voltage detector 14 detects a voltage generated between the three-phase current amplifier 13 and the distribution line simulation circuits 2a, 2b, and 2c. That is, the voltage detector 14 detects the voltage value of the distribution line simulation circuit 2.

  The voltage command generator 15 generates a voltage command value from the voltage value measured (detected) by the voltage detector 14.

  The converter 10 includes two AC / DC converters 20a and 20b and a DC capacitor 21, and converts an AC voltage into a DC voltage. The conversion device 10 converts the AC voltage input from the voltage source 4 into a three-phase AC voltage according to the voltage command value generated by the voltage command generator 15, and outputs it from the connection terminal 5a.

  The operation management device 50 switches the connection selection switch 6 in accordance with preset test conditions.

  The operation management device 50 acquires time-series data of distribution voltage values during the test period from the three-phase device under test 8 and the single-phase device under test 9 connected to the connection terminal 5a of the conversion device 10, and stores them as test data. The variable simulation voltage generator 1 is controlled so as to fall within a certain range in which the relationship between the demand power and the supply power is in reference to the time series data stored in the storage device. The voltage generated by the voltage generator 1 is applied to the distribution line simulation circuits 2a, 2b, and 2c. The storage device stores data to be provided to each device for testing.

  In addition, the operation management device 50 refers to the load corresponding to the test period and the time series data of the active power value and the reactive power value of the distributed power supply output, and applies the active power to the load distributed power supply simulation devices 3a, 3b, 3c, 3d. And reactive power is generated and applied to the wiring line simulation circuits 2a, 2b and 2c, and the current outputs of the three-phase device under test 8 and the single-phase device under test 9 and the voltage values of the wiring line simulation circuits 2a, 2b and 2c are obtained. It is acquired, compared with a preset threshold value, and a comparison result is output.

Subsequently, the operation of the test apparatus of this embodiment will be described.
In the case of this embodiment, each of the variable simulation voltage generator 1 and the one or more distribution line simulation circuits 2a, 2b, 2c is connected in series, and the three-phase AC voltage generated by the variable simulation voltage generator 1 is generated. Applied to the three-phase distribution line simulation circuits 2a, 2b and 2c.

  The three-phase AC voltage of the variable simulation voltage generator 1 generates a voltage in consideration of the rated voltages of the distribution line simulation circuits 2a, 2b and 2c.

  The variable simulation voltage generator 1 inputs a time synchronization signal and time-series voltage command value data from the operation management device 50 via the communication line 60 before starting the test, and sets the time in the variable simulation voltage generation device 1 to the operation management device 50. The time series voltage command value data is stored in the apparatus in synchronization with the above.

  Next, after inputting the test start signal transmitted by the operation management device 50, the voltage matching the time-series voltage command value data corresponding to the time is output, and at the same time, the voltage value is measured at the output terminal of the variable simulation voltage generator 1. Each measurement time set by the operation management apparatus 50 is sent to the operation management apparatus 50 via the communication line 60. When a test stop signal is input from the operation management device 50 via the communication line 60, the variable simulation voltage generator 1 stops and sets the voltage output value to zero.

  The variable simulation voltage generator 1 outputs the active power from the variable simulation voltage generator 1 to the distribution line simulation circuits 2a, 2b, and 2c, and the variable simulation voltage generation apparatus from the distribution line simulation circuits 2a, 2b, and 2c. It is assumed that the active power to 1 can be input. That is, the variable simulation voltage generator 1 can correspond to the output and input of active power, respectively.

  Distribution line simulation circuits 2a, 2b and 2c have a rated voltage of 1 / M of the rated voltage of the actual distribution line, a rated current of 1 / N times the rated current of the actual distribution line, and a rated capacity of the actual distribution line. 1 / (M × N).

  For example, assuming that the rated voltage of the actual distribution line is 6.6 kV, the rated current is 300 A, the rated voltage of the distribution line simulation circuits 2 a, 2 b, and 2 c is 200 V and the rated current is 10 A, M is 33 and N is 30; The rated capacity of the distribution line simulation circuits 2a, 2b, and 2c is 1/990 of the rated capacity of the actual distribution line.

  Moreover, since the simulation when the distribution line side voltage of the actual distribution transformer is 6.7 kV, for example, is 6.7 k / 6.6 k × 200 = 203.03, between the AC lines having an effective value of 203.3 V A voltage is generated by the variable simulation voltage generator 1.

  As shown in FIG. 2, for example, the distribution line simulation circuit 2a includes reactors 31a, 31b, and 31c, resistors 32a, 32b, and 32c, distance change switches 33a, 33b, and 33c, and voltage current frequency sensors 34a and 34b. Yes. The distribution line simulation circuits 2a, 2b, and 2c each equivalently simulate the power attenuation amount equivalent to the line length akm of the actual distribution line.

That is, in this distribution line simulation circuit 2a, the rated voltage to be simulated is 1 / M of the rated voltage of the actual distribution line, and the rated capacity to be simulated is 1 / (M × N) of the rated capacity of the actual distribution line. Resistance and reactance values are set. Distribution line simulation circuits 2a, 2b, and 2c equivalently simulate actual distribution lines under these conditions.
Reactors 31a, 31b, and 31c and resistors 32a, 32B, and 32c are power attenuating circuits. By opening and closing distance change switches 33a, 33b, and 33c, the values of reactors 31a, 31b, and 31c and resistors 32a, 32B, and 32c are changed. The value of each element can be changed while keeping the ratio constant.

  The distribution line simulation circuits 2a, 2b, and 2c simulate the distribution line when the length of the distribution line is changed by changing the values of the reactors 31a, 31b, and 31c and the resistors 32a, 32B, and 32c. The configurations of the other distribution line simulation circuits 2b and 2c are the same.

  The distribution line simulation circuit 2a equivalently simulates a reactor corresponding to akm of the actual distribution line by the reactor 31a, the reactor 31b, and the reactor 31c.

  Similarly, the resistance corresponding to akm of the actual distribution line is equivalently simulated by the resistor 32a, the resistor 32b, and the resistor 32c. That is, the distribution line simulation circuit 2a electrically simulates the amount of power loss (power load) according to the length of the actual distribution line.

  Here, in order to simplify the description, the reactance values of the reactor 31a, the reactor 31b, and the reactor 31c are assumed to be equal, and the resistance values of the resistor 32a, the resistor 32b, and the resistor 32c are assumed to be equivalent.

  In the configuration of FIG. 2, the distribution line simulation corresponding to the line length akm of the actual distribution line is divided into three equal parts according to the open / closed state of the three distance change switches 33a, 33b, 33c. The line length of the electric wire can be changed discretely.

  For example, when the distance change switch 33a is closed and the distance change switch 33b and the distance change switch 33c are opened ("open"), the reactor 31a and the resistor 32a are short-circuited (2a / 3) Km distribution line simulation circuit Become.

  In the example of FIG. 2, the configuration having the three distance change switches 33a, 33b, and 33c has been described. However, the number of distance change switches may be two or four, and one distance change switch is provided. That's all you need.

  As described above, in the distribution line simulation circuits 2a, 2b, and 2c, by opening / closing (selecting) the n distance change switches in the distribution line simulation circuits 2a, 2b, and 2c, the line length a of each distribution line is selected. The km equivalent of 0 km to akm can be changed discretely in units of (a / n) km, and the distribution line route from 0 km to a km can be changed by three distribution line simulation circuits 2a, 2b, 2c ( a / 3) Can be simulated in steps of km.

  The distance setting of the distribution line simulation circuits 2a, 2b, and 2c is performed by the distance change switch in the distribution line simulation circuits 2a, 2b, and 2c (33a, 33b, and 33c in the case of the distribution line simulation circuit 2a) before starting the test. ) And a distance change switch 33a, 33b, 33c opens or closes the switch according to the switch open / close command.

  Further, during the test, the three-phase line voltage and the three-phase line measured by the voltage / current frequency sensors in the distribution line simulation circuits 2a, 2b, and 2c (in the case of the distribution line simulation circuit 2a, the voltage / current frequency sensors 34a and 34b). Current and frequency measurement values are sent to the operation management apparatus 50 via the communication line 60 at every measurement time preset in the operation management apparatus 50.

  One or more load distribution power supply simulation devices 3a, 3b, 3c and 3d are connected in parallel to one or more distribution line simulation circuits 2a, 2b and 2c.

  The load distribution power supply simulation devices 3a, 3b, and 3c set the active power and reactive power obtained by adding the time series active power and reactive power of the load connected to the distribution line and the distributed power supply for each region for each time as target values. The active power and the reactive power corresponding to the active power target value and the reactive power target value are generated at the connection points with the distribution line simulation circuits 2a, 2b, and 2c.

As shown in FIG. 3, the load distribution power supply simulation device 3 a includes a data storage device 41, a PQV detector 42, a current command generator 43, and a three-phase current amplifier 44.
PQV is an abbreviation where P represents active power, Q represents reactive power, and V represents a three-phase line voltage.

  The data storage device 41 includes a test period of active power values and reactive power values that are input or output according to time by the load distribution power supply simulation device 3a sent from the operation management device 50 via the communication line 60 before starting the test. The time series data corresponding to is saved.

  In addition, the data storage device 41 receives a time synchronization signal from the operation management device 50, thereby synchronizing the time of the operation management device 50 with the time of the data storage device 41.

  When the test start signal transmitted from the operation management device 50 is input to the current command generator 43, the current command generator 43 detects the active power at the output terminal of the load sharing power supply simulation device 3a detected by the PQV detector 42. The measurement value, the reactive power measurement value, the three-phase line voltage measurement value, and the active power target value and the reactive power target value output from the data storage device 41 by the load distribution power supply simulation device 3a at the current time are captured.

  The current command generator 43 generates the active power target value, the reactive power target value that follows the active power target value and the reactive power target value from the three-phase line voltage value, and the amplitude of the three-phase current required for outputting the reactive power and the three-phase line voltage. A three-phase current command value composed of the phase of the three-phase current is calculated.

  During the test, the active power measurement value, the reactive power measurement value, and the three-phase line voltage value respectively measured by the load distribution power supply simulation devices 3a, 3b, 3c, and 3d are measured every measurement time set by the operation management device 50. To the operation management apparatus 50 via the communication line 60 from the load distribution power supply simulation apparatuses 3a, 3b, 3c, and 3d.

  The three-phase current amplifier 44 outputs a three-phase current corresponding to the three-phase current command value. The three-phase current amplifier 44 can output or input current, and the load distribution power supply simulation device 3a can output in the four quadrants in which the active power output and the reactive power output are independently combined with positive or negative.

  The load distribution power supply simulation devices 3a, 3b, 3c, and 3d generate active power and reactive power that are input or output while reading target values corresponding to the current times of the time-series data of active power values and reactive power values to be stored.

  When the active power is output from the load distribution power supply simulation devices 3a, 3b, 3c, and 3d to the distribution line simulation circuits 2a, 2b, and 2c, the load distribution power supply simulation devices 3a, 3b, 3c, and 3d output the effective power to the distribution system. When the active power is input from the distribution line simulation circuits 2a, 2b, and 2c to the load distribution power supply simulation devices 3a, 3b, 3c, and 3d, the load distribution power generation simulation devices 3a, 3b, 3c, and 3d are realized. Becomes a load simulator that receives active power from the distribution system.

  The rated line voltage of the load distribution power supply simulation devices 3a, 3b, 3c and 3d is equivalent to the rated voltage of the distribution line simulation circuits 2a, 2b and 2c, and the rated capacity of the distribution line simulation circuits 2a, 2b and 2c is actually distributed. As with 1 / (M × N) of the rated capacity of the electric wire, the active power target value and the reactive power target value that are transmitted from the operation management device 50 to the load distribution power supply simulation devices 3a, 3b, 3c, and 3d and stored. The time series data is assumed to be 1 / (M × N) of the active power value and the reactive power value obtained by adding up the active power and reactive power of the local distribution load and the distributed power source for each time.

  In the single-phase transformer 7, the primary side is a three-phase alternating current, the secondary side is a single-phase alternating current, and the other terminal of the single-phase transformer 7 that is not connected to the interconnection device 5 is a single-phase alternating current.

  Here, in order to simplify the explanation, the transformation ratio of the single-phase transformer 7 is 1: 1. A three-phase device under test 8 to be tested for three-phase alternating current is connected to the terminal on the interconnection device 5 side of the single-phase transformer 7, and a single-phase transformer under test is connected to the other terminal of the single-phase transformer 7. A single-phase device under test 9 to be tested is connected.

  The total capacity of the three-phase device under test 8 and the single-phase device under test 9 may be equal to or less than the capacity of the conversion device 10, and the three-phase device under test 8 and the single-phase device under test 9 may be connected simultaneously, For example, a single-phase device under test may be used as a plurality of home appliances in a detached customer. The three-phase device under test 8 and the single-phase device under test 9 may be home appliances such as a refrigerator, a television, an air conditioner, and a microwave oven, and a home power generation device such as a household solar power generation device or a fuel cell.

  In the test apparatus having this configuration, when the test start signal from the operation management apparatus 50 is input to the interconnection apparatus 5 via the communication line 60, the interconnection apparatus 5 starts operation, and the AC voltage of the voltage source 4 is AC / DC converted. The converter 20a converts the DC voltage of the DC capacitor 21 into a DC voltage while controlling the DC capacitor 21 to be constant, and the AC / DC converter 20b outputs an AC voltage corresponding to an AC voltage command value described later from the DC voltage.

  This AC voltage is applied to the three-phase device under test 8, converted into a single-phase AC via the single-phase transformer 7, and applied to the single-phase device under test 9. The current flowing through the three-phase device under test 8 and the single-phase device under test 9 is input from the voltage source 4 or input to the voltage source 4 via the converter 10.

  The current detector 11 in the interconnection device 5 measures a three-phase current flowing between the AC / DC converter 20 b and the single-phase transformer 7. The measured value of the three-phase current is three single-phase current values measured for each phase. The measured value of the three-phase current is sent to the current command generator 12.

The current command generator 12 generates a command value for the three-phase current of the three-phase current amplifier 13 from the three input single-phase current measurement values. The three-phase current command value is composed of three command values corresponding to the U phase, V phase, and W phase.
Here, the three-phase AC line rated voltage between the AC / DC converter 20b and the single-phase transformer 7 is A [V], and the three-phase AC line rated voltage of the distribution line simulation circuits 2a, 2b and 2c is In the case of B [V], the three-phase current command value of the three-phase current amplifier 13 generated by the current command generator 12 is
Three-phase current command value of the three-phase current amplifier 13 (U phase, V phase, W phase) =
Single-phase current measurement value (U phase, V phase, W phase) / (M × N) × A / B input from the current command generator 12
And

  The three-phase current command value is sent to the three-phase current amplifier 13, and the three-phase current amplifier 13 outputs a three-phase current composed of three single-phase currents corresponding to the three-phase current command value.

  When the three single-phase current measurement values input by the current command generator 12 are in an unbalanced state, the three-phase current output from the three-phase current amplifier 13 is in an unbalanced state. The three-phase current is input to any one of the distribution line simulation circuits 2a, 2b, and 2c connected by the connection selection switch 6.

  The contacts of the connection selection switch 6 are switched and connected according to connection information transmitted from the operation management device 50 to the connection selection switch 6 via the communication line 60 before the start of the test. That is, the connection selection switch 6 is switched by the control from the operation management device 50, and any of the distribution line simulation circuits 2 a, 2 b, 2 c is connected to the interconnection device 5.

  The connection point of the connection selection switch 6 is determined as one of the terminals of the distribution line simulation circuit 2 serving as a connection point on the distribution line to which the three-phase device under test 8 or the single-phase device under test 9 is to be connected. When the contact point 6 is changed, the connection positions of the distribution lines of the three-phase device under test 8 and the single-phase device under test 9 can be changed.

  The voltage detector 14 measures the three-phase AC voltage value of the three-phase current amplifier 13 and sends the three-phase AC voltage value to the voltage command generator 15. The three-phase AC voltage value is equal to the effective value of the three-phase line voltage at any terminal of the distribution line simulation circuits 2a, 2b, and 2c connected by the connection selection switch 6.

  The voltage command generator 15 calculates the AC voltage command value of the AC / DC converter 20b from the three-phase AC voltage value.

The three-phase AC line rated voltage between the AC / DC converter 20b and the single-phase transformer 7 is A [V], and the three-phase AC line rated voltage of the distribution line simulation circuits 2a, 2b, and 2c is B [V]. ]
AC voltage command value of voltage command generator 15 =
(A / B) × three-phase AC voltage value of the three-phase current amplifier 13... The AC voltage command value of the AC converter 20b is calculated by this equation.

  In this way, the line voltage value at the connection end of the distribution line simulation circuits 2a, 2b, 2c connecting the interconnection device 5 to the three-phase device under test 8 or the single-phase device under test 9 is multiplied by (A / B). The equivalent line voltage is applied.

  That is, the voltage command generator 15 multiplies the voltage value detected by the voltage detector 14 of the distribution line simulation circuit (B / A) to generate the voltage command value of the converter 10.

  Further, the current command generator 12 multiplies the current value of the connection terminal 5 a detected by the current detector 11 in the interconnection device 5 by (B / (A × M × N)), and the three-phase current amplifier 13. A phase current command value is generated.

  When the three-phase device under test 8 or the single-phase device under test 9 is a power supply source, the current from the device under test is equivalent to each phase obtained by equivalently converting each phase current value by A / (M × N × B) times. The current is switched by the connection selection switch 6 and input to the distribution line simulation circuit 2 from the distribution line simulation circuit (any one of the distribution line simulation circuits 2a, 2b, 2c) connected to the contacts.

  During the test, the distribution line voltage at the distribution line position where the three-phase device under test 8 and the single-phase device under test 9 are connected to the three-phase device under test 8 and the single-phase device under test 9 via the interconnection device 5. The equivalent conversion is applied to the three-phase device under test 8 and the single-phase device under test 9, and the load current generated by the voltage application is equivalently converted via the interconnection device 5 and injected into the distribution line simulation circuit 2.

  During the test, the three-phase AC voltage and the three-phase AC current of the connection selection switch 6, the three-phase AC voltage and the three-phase AC current at the end of the AC / DC converter 20b, the three-phase device under test 8 and the single-phase device under test The measured values (measurement data) of the nine AC voltages and AC currents are sent to the operation management device 50 via the communication line 60 at every measurement time preset in the operation management device 50 and stored in the internal storage device. Is done.

  The operation management device 50 confirms whether the voltage values of the distribution line simulation circuits 2a, 2b, and 2c at each time are within a specified range from the measurement data at the time of the test stored in the storage device after the test, and load distribution Confirm whether the power simulation devices 3a, 3b, 3c, 3d, the three-phase device under test 8 and the single-phase device under test 9 have changes in active power and reactive power, and whether there is an influence on the distribution line voltage due to the connection point to the distribution line To do. Furthermore, the measured values of the AC voltage and AC current of the device under test such as the three-phase device under test 8 and the single-phase device under test 9 are confirmed to check whether the device under test has failed or stopped, and over the test period. Check for problems when connecting the distribution line of the device under test. The confirmation of the occurrence of a problem may be automatic or manual.

  Test conditions that are sent and set from the operation management device 50 in this way (voltage values of the variable simulation voltage generator 1, distribution line distances of distribution line simulation devices 2a, 2b, 2c, load distribution power supply simulation devices 3a, 3b, 3c 3d time series active power value and reactive power value, connection selection switch 6 connection point, etc.) are changed for each test to change the distribution line condition (power load: distance), and to the three-phase device under test 8 And a system connection test of the single-phase device under test 9 is performed.

  Thus, according to this embodiment, m distribution line simulation circuits 2a, 2b, and 2c are connected in series to the variable simulation voltage generator 1, and the load distribution power supply simulation devices 3a, 3b, 3c, and 3d are respectively connected to the distribution lines. In the configuration in which k terminals are connected in parallel to the terminals of the simulation circuits 2a, 2b, and 2c, and the voltage is applied by the variable simulation voltage generator, the rated voltage of the distribution line simulation circuits 2a, 2b, and 2c is 1 of the actual distribution line rated voltage. / M, the rated current of the distribution line simulation circuits 2a, 2b, 2c is 1 / N of the actual distribution line rated voltage, and the line length of the distribution line can be freely changed in increments of a / n km with a length of a × m km It is possible to freely simulate various distribution line configurations.

  By giving the time series data of the active power value and reactive power value as 1 / (M × N) of the active power and reactive power in the actual distribution line in the load distribution power supply simulation devices 3a, 3b, 3c, 3d, the rated capacity Connected n loads / distributed power supplies that input / output 1 / (M × N) active power or reactive power to the rated capacity of the actual distribution line to any terminals of the distribution line simulation circuits 2a, 2b, 2c. The distribution system can be simulated.

  Thus, the line length of the wiring line, the load on the distribution line, the distribution of the distributed power source and the size thereof can be freely changed, and various distribution line configurations in which the capacity is equivalently converted to the actual distribution line can be simulated.

  Time series data of active power values and reactive power values of the load distribution power supply simulation devices 3a, 3b, 3c, and 3d are prepared for a time length corresponding to a predetermined period, and the load distribution power supply simulation device 3a is referred to with reference to the time series data. The input and output of the active power value and the reactive power value of 3b, 3c, and 3d are changed every moment, and the voltage value of the variable simulation voltage generator 1 is set so as to correspond to the voltage change of the actual distribution substation for a predetermined period. If it is changed from time to time, it is possible to simulate a power distribution system obtained by equivalently converting the capacity of the actual power distribution system for a predetermined period.

  Further, the interconnection device 5 is connected to an arbitrary terminal of the wiring line simulation circuits 2a, 2b, 2c via the connection selection switch 6, and the line voltage at this connection point is set to the three-phase of the distribution line simulation circuits 2a, 2b, 2c. Three-phase voltage to be tested by generating equivalent three-phase voltage in consideration of the ratio between the AC line voltage rating and the three-phase AC line voltage rating between the AC / DC converter 20b and the single-phase transformer 7 The single-phase voltage applied to the single-phase transformer 7 is applied to the single-phase test object 9 and the voltage is applied to the three-phase test object 8 and the single-phase test object 9. The generated three-phase current between the AC / DC converter 20b and the single-phase transformer 7 is changed to the three-phase AC rated current of the distribution line simulation circuits 2a, 2b and 2c and the three-phase current between the AC / DC converter 20b and the single-phase transformer 7 The distribution line simulation circuits 2a, 2b, 2c connected by the connection selection switch 6 in consideration of the ratio with the rated current of the phase alternating current It is possible to inject current into the child.

  As a result, the distribution line simulation circuits 2a, 2b, and 2c equivalently simulate the actual distribution line, connect the three-phase device under test 8 and the single-phase device under test 9 corresponding to the actual machine, and further change the voltage of the actual distribution line. Correspondingly changing the voltage of the distribution line simulation circuits 2a, 2b, and 2c equivalently equivalent to the rated voltage of the three-phase device under test 8 or the single-phase device under test 9 is equivalently converted. Since it can be applied to the device under test 9, the response and characteristics of the three-phase device under test 8 and the single-phase device under test 9 when the three-phase device under test 8 and the single-phase device under test 9 are connected to the actual distribution line can be obtained. It is possible to test the distribution line simulation circuits 2a, 2b, and 2c and verify the operation and performance. Since the distribution line simulation circuits 2a, 2b and 2c can change the conditions such as the wiring line length and load distribution as described above, the three-phase device under test 8 and the single-phase device under test 9 can be connected in various distribution line configurations. Can be carried out efficiently.

  In addition, since a circuit simulating the equivalent of a distribution line is used, a test can be performed in a smaller space than a test equivalent to an actual distribution line.

  Further, the current when voltage is applied to the three-phase device under test 8 or the single-phase device under test 9 corresponding to the actual machine is equivalently converted in consideration of the rated current of the distribution line simulation circuit 2 and injected into the distribution line simulation circuit 2. it can. As a result, the distribution line simulation circuit 2 can reflect the load characteristic that is the relationship between the voltage and current of the three-phase device under test 8 and the single-phase device under test 9, so that the simulation accuracy in the distribution line simulation circuit 2 can be highly evaluated. .

  Further, an operation management device 50 that collects and controls data from each device is provided. The operation management device 50 is a device under test (three-phase device under test 8 or single-phase device under test) connected to the connection terminal 5a of the conversion device 10. The time series data of the distribution voltage value in the test period is acquired from the device 9), and the variable simulated voltage generator 1 is set so that the relationship between the demand power and the supplied power falls within a certain range with reference to the acquired time series data. The voltage generated by the variable simulation voltage generator 1 is applied to the distribution line simulation circuit by controlling the load and the time series data of the active power value and reactive power value of the distributed power source output corresponding to the test period. Then, active power and reactive power are generated in the load distribution power supply simulation devices 3a, 3b, 3c and 3d and applied to the wiring line simulation circuit 2, and the current output and distribution of the three-phase device under test 8 and the single-phase device under test 9 are distributed. Voltage of electric wire simulation circuit 2 It acquires, compared with a preset threshold for evaluation, and outputs a comparison result. Thereby, the result of the test can be comprehensively evaluated in a form closer to the actual wiring by connecting the distribution line simulation circuit 2 simulating the distribution line to the actual machine and performing the test for a predetermined period.

  In other words, a large-capacity distributed power supply or load device can be connected to a space-saving simulated power distribution system that can easily change the distribution system configuration and load conditions. Easily change the connection point to the simulated power distribution system, and the effects on the power distribution system due to the test of the distributed power supply and load device actual equipment for a predetermined period and the output change of the distributed power supply and the load etc. It can be evaluated efficiently.

  Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  Further, each component shown in the above embodiment may be realized by a program installed in a storage such as a hard disk device of a computer, and the program is stored in a computer-readable electronic medium: electronic media, The computer may realize the functions of the present invention by causing a computer to read a program from an electronic medium. Examples of the electronic medium include a recording medium such as a CD-ROM, flash memory, and removable media. Further, the configuration may be realized by distributing and storing components in different computers connected via a network, and communicating between computers in which the components are functioning.

  DESCRIPTION OF SYMBOLS 1 ... Variable voltage generator, 2a, 2b, 2c ... Distribution line simulation circuit, 3a, 3b, 3c, 3d ... Load distribution power supply simulation device, 4 ... Voltage source, 5 ... Interconnection device, 6 ... Connection selection switch, 7 DESCRIPTION OF SYMBOLS ... Single phase transformer, 8 ... Three-phase device under test, 9 ... Single-phase device under test, 10 ... Conversion device, 11 ... Current detector, 12 ... Current command generator, 13 ... Three-phase current amplifier, 14 ... voltage detector, 15 ... voltage command generator, 20a, 20b ... AC / DC converter, 21 ... DC capacitor, 31a, 31b, 31c ... reactor, 32a, 32B, 32c ... resistor, 33a, 33b 33c ... Distance change switch 34a, 34b ... Voltage current frequency sensor 41 ... Data storage device 42 ... PQV detector 43 ... Current command generator 44 ... Three phase current amplifier 50 ... Operation management device 60 ... Communication line.

Claims (7)

A distribution line side voltage simulator that generates a voltage obtained by reducing the distribution line side voltage of the actual distribution transformer by a specified magnification;
A distribution line simulation circuit that is connected to the distribution line side voltage simulation device and electrically simulates the amount of power loss according to the length of the actual distribution line,
A voltage detector for detecting a voltage value of the distribution line simulation circuit;
A voltage command generator that is connected to the distribution line simulation circuit, has a connection terminal to which a device under test is connected, and generates a voltage command value from the voltage value detected by the voltage detector;
In accordance with the voltage command value generated by the voltage command generator, a conversion device that converts an input AC voltage into a three-phase AC voltage and outputs it from the connection terminal;
A current detector for detecting a current value flowing through the connection terminal;
A current command generator for generating a three-phase current command value from the current value detected by the current detector;
A test apparatus comprising a three-phase current amplifier that inputs and outputs a three-phase current corresponding to the three-phase current command value to and from the distribution line simulation circuit. The rated voltage of the distribution line simulation circuit is 1 / M of the rated voltage of the actual distribution line, the rated current is 1 / N of the rated current of the actual distribution line, and the rated voltage of the distribution line simulation circuit is A [V]. When the rated voltage of the connection terminal of the converter is B [V],
The voltage command generator is
(B / A) times the voltage value of the distribution line simulation circuit detected by the voltage detector to generate a voltage command value of the converter,
The current command generator is
The test apparatus according to claim 1, wherein the current value of the connection terminal detected by the current detector is multiplied by (B / (A × M × N)) to generate a three-phase current command value of a three-phase current amplifier.   2. The test according to claim 1, further comprising a load distribution power supply simulation device that refers to time series data of the active power value and the reactive power value and simulates a load that generates active power and reactive power according to time and an output of the distributed power source. apparatus. The distribution line simulation circuit is
It has a power attenuating circuit composed of a resistor and a reactance, and the value of each element can be varied while keeping the ratio of the value of the resistor and the reactance constant, and the value of the resistor and the reactance can be changed. The test apparatus according to claim 1, wherein the test apparatus simulates the distribution line when the length of the distribution line is changed by changing the length. A circuit switch for varying the resistance and reactance values of the distribution line simulation circuit;
The test apparatus according to claim 1, further comprising an operation management apparatus that switches the circuit changeover switch in accordance with a preset test condition. The operation management device includes:
Obtain time series data of distribution voltage values during the test period from the device under test connected to the connection terminal, and refer to the obtained time series data to enter a certain range where the relationship between demand power and supply power And controlling the distribution line side voltage simulation device to apply the voltage generated by the distribution line side voltage simulation device to the distribution line simulation circuit, and the effective power value of the load corresponding to the test period and the distributed power source output And reactive power value time series data, the load-distributed power supply simulation device generates active power and reactive power and applies them to the wiring line simulation circuit, and the current output of the device under test and the distribution line simulation 6. The test apparatus according to claim 5, wherein a voltage value of the circuit is acquired, compared with a preset threshold value, and a comparison result is output. The distribution line side voltage simulator generates a voltage obtained by reducing the distribution line side voltage of the actual distribution transformer by the specified magnification.
The distribution line simulation circuit connected to the distribution line side voltage simulator electrically simulates the amount of power loss according to the actual length of the distribution line,
A voltage detector detects the voltage value of the distribution line simulation circuit,
A voltage command generator connected to the distribution line simulation circuit has a connection terminal to which a device under test is connected, and generates a voltage command value from the detected voltage value,
In accordance with the generated voltage command value, the input AC voltage is converted into a three-phase AC voltage and output to the device under test,
A current detector detects a current value flowing through the connection terminal,
A current command generator generates a three-phase current command value from the detected current value,
A test method, wherein a three-phase current amplifier inputs / outputs a three-phase current corresponding to the generated three-phase current command value to / from the distribution line simulation circuit.

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