JP4666507B2 - Test apparatus and test method for isolated operation detection device - Google Patents

Description

  The present invention automatically determines the tidal current at the disconnection point in the test device of the isolated operation detection device for testing the isolated operation detection device provided in the private power generation facility that is interconnected to the commercial system. The present invention relates to an apparatus and a method for performing system disconnection.

  In-house power generation facilities such as cogeneration systems are generally operated in conjunction with the power system. In this case, even if the power system side is disconnected due to a power outage or the like, if a “single operation” occurs in which the in-house power generation facility continues to supply power to the load, an accident such as an electric shock or damage to the equipment at the time of power recovery occurs. There is a danger, and “Interpretation of technical standards for electrical equipment” (former grid connection guidelines) stipulates that protective relays such as isolated operation detectors are installed to prevent isolated operation.

  That is, as shown in FIG. 4, in the system in which power is supplied from the power system 4 to the load 30 via the power line 51, the private power generation facility 2 is connected to the load side of the power receiving breaker 11. There are various types of isolated operation detectors, and there are two types of installation methods: one built in the private power generation facility and another installed type. The isolated operation is detected by information such as voltage and frequency, and disconnected from the generator. Give a directive.

  The power generation equipment connected to the commercial system is equipped with an independent operation detection device, which satisfies the “interpretation of technical standards for electrical equipment”, and two or more private power generation equipment are installed on one pole transformer. In the case of interconnection, it is generally required to perform a test for confirming whether each isolated operation detection device operates normally. In other words, the test that the isolated operation time of the isolated operation detection device is within a predetermined time is determined by creating an isolated operation state in a state where the power generation output of the private power generation facility and the load are balanced, that is, in the absence of power flow. This is a test for measuring a disconnection time which is a time required from the start of operation to the disconnection.

  FIG. 3 shows a test apparatus for measuring the disconnection time of the isolated operation detection apparatus. This test apparatus includes, for example, a plurality of private power generation facilities 2, a simulated load 3, a commercial power source (simulated power source by UPS or the like) 4, a disconnection breaker 41, and a wattmeter that displays each power of a connection point 59. 7 and a disconnection time measuring unit 61 that measures the time from when the disconnection breaker 41 is disconnected until the independent operation detection device operates and the private power generation facility is disconnected. Each private power generation facility 2 and the load 3 are connected at a connection point 59, and the connection point 59 and the commercial power supply 4 are connected via a disconnection breaker 41. This figure shows the case where the isolated operation detection device 1 is built in the generator.

  Each private power generation facility 2 includes a private power generation device 21 using a fuel cell or sunlight, and each private power generation device 21 is connected to a connection point 59 via a power control device (power converter) 22. The simulated load 3 includes an R load 31, an L load 32, a C load 33, a motor load 34, and the like.

  In this test apparatus, the output of the private power generation facility 2 and the load amount of the simulated load 3 are adjusted, and the tidal current active power P3 and reactive power Q3 at the disconnection point 41 are adjusted to preset values in a stable state. The disconnection breaker 41 is disconnected to create a single operation state, and the disconnection time is measured. In the tidal current adjustment, the active power P and the reactive power Q at the interconnection point 59 using the power meter 6 (not shown), the active power 1P and the reactive power Q1 for the self-generated power, the active power P2 for the load and the reactive power Q2, The active power P3 and the reactive power Q3 at the disconnection point are confirmed, and the system breaker 41 is manually disconnected when the active power P3 and the reactive power Q3 at the disconnection point are set to predetermined values, for example, 0, respectively. ing.

Although the output of the private power generation facility 2 is very small, it constantly fluctuates, and the resistance of the simulated load 3 varies with temperature. Therefore, even when the power flow at the connection point 59 is stably adjusted, the active power P3 and the reactive power Q3 at the disconnection point always fluctuate. Therefore, at the time when the disconnection breaker 41 is manually disconnected. The current may deviate from the set value. In addition, as the amount of generated power increases, the fluctuation increases, and it is difficult to monitor the power meter and visually check the point of zero power flow. Therefore, the current flow sometimes deviates from a preset value when the disconnection point 41 is disconnected. For this reason, the same test is carried out a plurality of times so that the set value is disconnected.
JP 2001-112176 A

  An object of the present invention is to enable reliable disconnection at a predetermined set value of a tidal current in a test of an isolated operation detection device.

  In order to solve the above-described problem, the present invention measures the active power P and reactive power Q at the disconnection point, and predicts the time when the power flow becomes a set value by those values and automatically disconnects the circuit breaker 41. By disconnecting, the tidal current can be easily adjusted and the accuracy of the test is improved.

In order to solve the above-described problem, the present invention is directed to solving the above-described problem, in which the self-power generation facility and the simulated load are linked to the power system via a disconnect circuit breaker. the apparatus for testing isolated operation detecting apparatus for measuring time of the circuit breaker from the Kairetsu to isolated operation detecting apparatus detects house power generators are disconnection, self house power generation amount active power and reactive power, and the simulated load Means for detecting the active power and reactive power of the minute and the active power and reactive power at the disconnection point, a condition setting unit for setting a condition for disconnecting, and the simulated load based on the set value of the condition setting unit A simulated load control unit that controls the active power and reactive power of the power source, a tidal current power predicting unit that predicts a time at which the value set by the condition setting unit is predicted, comprising a disconnecting circuit breaker disconnecting unit for disconnecting the circuit breaker .

The test apparatus for the isolated operation detection apparatus includes a disconnection time measuring unit that measures a time from when the disconnection circuit breaker is disconnected until the isolated operation detection apparatus operates .

This is a test method for an isolated operation detection device that detects isolated operation caused by disconnecting a disconnect circuit breaker in a circuit where the private power generation facility and the simulated load are linked to the power system, and is effective for private power generation. It detects the power and reactive power, and the active power and reactive power for the simulated load, and the active power and reactive power at the disconnection point, and sets the conditions for disconnecting, and based on this setting value, Controls the active power and reactive power, and monitors the active power and reactive power for in-house power generation, the active power and reactive power for the simulated load, and the active power and reactive power at the disconnection point, and predicts the time that will be set Then, the disconnect circuit breaker is disconnected at the time, and the time from the time of disconnection to the time when the independent operation detection device operates and the private power generator is disconnected is measured .

  The private power generation facility and the simulated load are connected to the power system via the disconnect circuit breaker, and after the disconnect circuit breaker is disconnected, the isolated operation detection device detects and the private power generation facility is disconnected. In the test method of the isolated operation detection device that measures time, it detects the active power and reactive power for in-house power generation at the interconnection point, the active power and reactive power for the simulated load, and the active power and reactive power at the disconnection point, The time at which the circuit breaker is disconnected is predicted from each detected power, and the circuit breaker is disconnected at the predicted time, and the isolated operation detection device operates and the private power generator is disconnected from the time of the disconnection. Measure the time until.

  The test apparatus for an isolated operation detection apparatus according to the present invention includes an in-house power generation facility 2, a simulated load 3, a commercial power source (simulated power source using UPS, etc.) 4, a disconnection breaker 41, and each power at a connection point 59. From this, the system disconnection time prediction unit 62 that predicts the time when the power flow at the disconnection point becomes a predetermined value and disconnects the disconnection breaker 41 at the predicted time, and the disconnection breaker 41 disconnects. And a disconnection time measuring unit 61 that measures the time until the private power generation facility is disconnected. The private power generation facility 2 and the simulated load 3 are connected at a connection point 59, and the connection point 59 and the commercial power supply 4 are connected via a disconnection breaker 41. The isolated operation detection device 1 has a type built in the private power generation facility and a separate type, but is inserted between the private power generator 21 and the interconnection point 59 to perform a test.

  The private power generation facility 2 includes a private power generation device 21 using a fuel cell or sunlight, and each private power generation device 21 is connected to a connection point 59 via a power control device (power converter) 22. The simulated load 3 includes an R load 31, an L load 32, a C load 33, a motor load 34, and the like, and the load-based active power P <b> 2 and the reactive power Q <b> 2 are controlled by a load control command from the simulated load control unit 622.

  The test apparatus for an isolated operation detection apparatus according to the present invention adjusts the output of the private power generation facility 2 and the load amount of the simulated load 3, and adjusts the active power P2 and the reactive power Q2 of the simulated load to preset values. A stable state, that is, a time when the active power P3 and reactive power Q3 at the disconnection point reach predetermined values is predicted, and the disconnect circuit breaker 41 is disconnected at the predicted time to create a single operation state. Measure the time from the column to the self-generated column. In the tidal current adjustment, the active power P1 and reactive power Q1 for private power generation at the interconnection point 59, the active power P2 and reactive power Q2 for the load, and the active power P and reactive power Q3 at the disconnection point are acquired. Thus, the time when the active power P3 and the reactive power Q3 at the disconnection point are each 0 or a predetermined value is predicted, and the disconnection breaker 41 is disconnected at that time.

  The system disconnection time prediction unit 62 includes the active power P1 and reactive power Q1 for private power generation at the interconnection point 59, the active power P2 and reactive power Q2 for the load, and the active power P3 and reactive power Q3 for the disconnection point. Is set, and the active power P2 and reactive power Q2 for the load are adjusted so as to correspond to the active power P1 and reactive power Q2 for in-house power generation, and the power flow is set to the target state, and the disconnection point is enabled The fluctuations in the power P3 and the reactive power Q3 are monitored, and the active power P3 and the reactive power Q3 at the disconnection point become predetermined values, for example, “0” from the fluctuation patterns of the active power P3 and the reactive power Q3 at the disconnection point. A time is predicted, and at that time, a signal (disconnection breaker disconnection command) for disconnecting the disconnection breaker 41 is output to disconnect the disconnection breaker 41.

  In order to perform such a function, as shown in FIG. 2, the system disaggregation prediction unit 62 includes a condition setting unit 621 for setting a condition for disconnecting, and the effective of the simulated load 3 based on this setting. The simulated load control unit 622 controls the power P2 and the P reactive power Q2 so that the active power P3 and the reactive power Q3 at the disconnection point (tidal current) become predetermined values, and the active power P3 and the reactive power Q3 at the disconnection point. A tidal power predicting unit 623 that predicts a time when becomes a predetermined value, and a disconnect circuit breaker disconnecting unit 624 that operates the disconnect circuit breaker 41 at the predicted time to disconnect commercial power. is doing.

As described above, according to the present invention,
A. The person who performs the disconnection operation becomes unnecessary, and it is not necessary to observe the instrument.
I. The power value of the tidal current at the disconnection point can be easily set to other than zero.
C. Since the power is automatically measured by the machine to perform the disconnection, it can be operated instantaneously, data can be acquired under the same disconnection conditions, and data accuracy can be improved. Thereby, there is an effect that it is not necessary to set a plurality of tests for operating under accurate conditions.

The figure explaining the outline | summary of a structure of the test apparatus of the independent operation detection apparatus concerning this invention. The figure explaining the outline | summary of a structure of the system disconnection time prediction part of the test apparatus of the independent operation detection apparatus concerning this invention. The figure explaining the outline | summary of a structure of the testing apparatus of the conventional independent operation detection apparatus. The figure explaining the installation state of the independent operation detection apparatus in the private power generation equipment connected to an electric power grid | system.

Explanation of symbols

  1: isolated operation detection device, 11: power receiving circuit breaker, 12: current measurement CT, 13: reverse power circuit breaker, 14: underfrequency circuit breaker, 2: private power generation equipment, 21: private power generation device, 22: power Control device, 3: Simulated load, 30: Load, 31: R load, 32: L load, 33: C load, 34: Motor load, 4: Power system, 41: Disconnection breaker (disconnection point), 51 : Power line, 52: breaker for generator, 53: breaker for distribution, 54: power demand monitor, 59: interconnection point, 61: disconnection time measurement unit, 62: system disconnection time prediction unit, 621: condition Setting unit, 622: Simulated load control unit, 623: Tidal power prediction unit, 624: Disconnection breaker disconnection unit, 7: Wattmeter.

Claims (3)

In a circuit where a private power generation facility and a simulated load are connected to the power system via a disconnect circuit breaker, a test of an isolated operation detection device that detects an isolated operation caused by disconnecting the disconnect circuit breaker is performed. A test device for an isolated operation detection device,
Means for detecting active power and reactive power for in-house power generation, active power and reactive power for the simulated load, and active power and reactive power at the disconnection point;
A condition setting unit for setting conditions for disassembling,
A simulated load control unit that controls the active power and reactive power of the simulated load based on the set value of the condition setting unit;
A tidal current power predicting unit that predicts a time that is a value set by the condition setting unit;
A test apparatus for an isolated operation detecting device , comprising: a disconnect circuit breaker disconnecting unit that disconnects the disconnect circuit breaker at the time predicted by the power flow prediction unit . In the test apparatus of the isolated operation detection device according to claim 1,
A test apparatus for a stand-alone operation detection apparatus, comprising: a disconnection time measuring unit that measures a time from when the disconnection breaker is disconnected until the stand-alone operation detection apparatus operates. In a circuit in which a private power generation facility and a simulated load are linked to a power system, a test method for an isolated operation detection device that detects isolated operation caused by disconnecting a disconnected circuit breaker,
Active power and reactive power for private power generation, active power and reactive power for simulated load, and active power and reactive power at the disconnection point are detected.
In addition to setting conditions for disconnecting,
Based on this set value, the active power and reactive power of the simulated load are controlled,
Privately generated partial active and reactive power, and simulated the load-active and reactive power of the active and reactive power and disconnecting point to predict the time and a value set by monitoring the disconnection interrupted to the time Disconnect the vessel,
A test method for an isolated operation detecting device, characterized by measuring a time from when the disconnected operation is performed until the isolated operation detection device operates and the private power generation device is disconnected.

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