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Interconnection / Mains Decoupling
Contents:
  1. Navigation menu
  2. Relay protection and automation cubicles
  3. Power-system protection device with IoT-based support for integration in smart environments
  4. Why under voltage relay protection is important?

If an accident or emergency operation or the like in interconnection lines occurs, interconnection within systems, or to operate the breakers from the interconnected network to the commercial power supply side, all or part of the interconnection system is disconnected from the commercial power source it is that there is. Alone for such commercial power grid interconnection system, separated from the state in which the distributed power supply continues operating while connected to the interconnected network, supplies power to the interconnection lines is disconnected from the commercial power source that operation.

Although it should be inherently non-voltage interconnection lines is disconnected from the commercial power supply is in a state of interconnection lines islanding is disconnected from the commercial power supply by the distributed power supply upon failure has been charged. Therefore, the isolated operation can and interfere with maintenance of interconnection systems, hinder fire fighting for electrical fires.

Further, the interconnection lines is disconnected from the commercial power supply, and the power consumption of the load and the supply power of the distributed power supply is not balanced, thereby the voltage and voltage frequency output by the distributed power supply system greatly deviate from the predetermined range there is also a problem of damage to the load equipment.

Therefore, a distributed power source in the state of independent operation to promptly Kairetsu from interconnection system, by detecting the frequency fluctuation of the system voltage of the interconnection line, the distributed power supply is in a state of islanding and techniques for detection are mounted using the e. When the introduction of the distributed power supply system is enlarged, resulting in a large number of distributed power supply system is the interconnection to the power system. In this case, if erroneously detected as the single operation of the disturbance of the power system, a number of distributed power supply system Resshi solutions simultaneously from the power system, may impair power quality of the power system.

Therefore, the techniques disclosed herein, to ensure the power quality, and an object thereof to suppress unwanted disconnection. In order to solve the above problems, the relay operation setting device disclosed herein is a relay operation setting device for setting the disconnection condition of the protective relay which controls the disconnection of the dispersed type power supply from the power system a frequency detector for detecting the frequency of the system voltage of the electric power system, based on the detected frequency, and the angular acceleration calculation unit that calculates an angular acceleration of the system voltage based on the angular acceleration the calculated, or wherein the disconnection conditions of the protective relay, to the dispersed type power supply during an accident does not perform disconnection of the dispersed type power supply by detecting that meet accidents during operation continuation requirement accidents during operation continuation condition of the electric power system and a protection relay setting determination unit for determining whether.

According to the relay operation setting device, the disconnection condition of the protective relay, if necessary, an accident during the operation continues Fault Ride Through: hereinafter, abbreviated as FRT not Resshi solutions if they meet the requirements FRT conditions by switching it on, it is possible to suppress unwanted disconnection of the distributed power supply system in the event that meets the FRT requirements. Block diagram showing the configuration of a power conditioner according to the first embodiment.

Block diagram showing an example of a configuration of a power conditioner control apparatus according to the first embodiment. Flowchart illustrating the operation of relay operation setting apparatus according to the first embodiment is performed. A the system interconnection Regulations JEAC , and a frequency relay conforms to the standard of the system interconnection rules JEAC [ years Supplement Part 1 ] , and, the voltage relay setting an example of the solution column conditions.

OverCurrent Relay: Protection of electrical power systems against excessive currents

A In a distributed power supply system according to the first embodiment, and shows the frequency variation of the system voltage. B shows the operation and disconnection condition of the frequency relay with respect to the frequency variation of FIG. The disconnection condition of c the frequency relay when secured to the "system interconnection conditions", shows the operation of the frequency relay with respect to the frequency variation of FIG.

It shows the characteristics of the phase shift applying section according to the first embodiment. Block diagram showing an example of a configuration of a power conditioner control apparatus according to the second embodiment.


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It shows the characteristics of the phase shift applying section according to the second embodiment. Flowchart illustrating the operation of the relay operation setting apparatus according to the second embodiment performs. It shows the characteristics of the phase shift applying section according to the third embodiment.

Circumstances that led to the invention As described above, in the conventional distributed power system, it is required to disconnection of the distributed power supply by detecting the islanding state. Therefore, distributed power system has independent operation detecting function for detecting an islanding operation, it is necessary to disconnection promptly distributed power supply by detecting the islanding.

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On the other hand, as described above, disconnection of the distributed power supply is likely to affect the voltage and frequency of the power system. Fewer distributed power supply system, when the power supply of the distributed power supply is considerably smaller than the power supply amount of the commercial power supply, a small decrease in the electricity supply in a distributed power supply interconnection line be paralleled Therefore, it is less significant effect on the voltage and frequency of the commercial power is out.

However, when a state results in which the large number of distributed power sources are interconnection to the power grid, distributed power because the power supply amount to the instant when Kairetsu simultaneously decreases, the voltage and frequency of the interconnection system is significantly reduced is a problem that. In particular, the system interconnecting system for the power distribution system, the instantaneous voltage drop or the instantaneous frequency variation interconnection system according to accidents such as power generation systems and power transmission system, the distributed power islanding detection function erroneously recognize When it is islanding , there is a possibility that simultaneous disconnection of the distributed power supply is generated.

Relay protection and automation cubicles

To address this problem, the future, for the distributed power sources that large quantities can be interconnection is expected, if the voltage drop or frequency fluctuation satisfies the FRT requirement to have a function to continue the operation of the dispersed type power supply is required. On the other hand, if the distributed power becomes isolated operation, or if the dispersed type power supply and power conditioner when a failure or interconnected network continuous abnormality occurs, promptly distributed power sources it is required to solutions column.

In the conventional independent operation detecting function, even grid fault as determined operation continues at FRT requirements, performing disconnection of rapidly dispersed power source in the case of distributed power supply is erroneously recognized as the sole driving for thus, there is a possibility that unnecessary disconnection occurs. On the other hand, when the distributed power is solely operated also detect the islanding detection function, Ensure whether or not the condition asked to continue operation in the FRT requirements, make sure that does not satisfy the condition assuming that performs disconnection from, may not perform the disconnection in a defined time period in the case where the distributed power supply is shifted to independent operation.

Therefore, we, during independent operation, when operation continuation conditions are satisfied frequency variation, and in each case at the time of system interconnection operation, the constant time rate of change of the frequency of the system voltage of the electric power system angular acceleration trend was focused on the fact that there is. This gave the idea to change depending frequency relay, the operation setting of the protection relay such voltage relay angular acceleration.

Islanding fear to paralleled the distributed power supply and senses the abnormality of the system voltage and frequency when the certain set, if the condition is not satisfied by monitoring whether or not the condition asked to continue operation in the FRT requirements setting to the distributed power supply disconnection by switching setting to disconnection of the distributed power supply and senses the abnormality of the system voltage and frequency, a disconnection condition in accordance with the angular acceleration otherwise, the protection relay not avoiding the appropriate configuration, it is possible to suppress unnecessary disconnecting.

Power-system protection device with IoT-based support for integration in smart environments

Moreover, rather than determining whether to disconnection of distributed power directly using angular acceleration, by changes the disconnection condition of the protection relay, for disconnecting satisfy the disconnecting condition of the protection relay , it is possible to check the operating condition of the dispersed type power supply using both disconnection condition of the angular acceleration and the protection relay, it is possible to achieve both the implementation and unnecessary inhibition of the disconnection of the disconnecting required.

Embodiment Hereinafter, embodiments of the present invention will be described with reference to the drawings. The power conditioner has a terminal Ta and the terminal Tb, along with the distributed power supply is connected a DC power source to the terminal Ta, it is used in the interconnection morphology to the power system through a terminal Tb provides power to connected between the power conditioner and the electric power system Distributed power source is, for example, solar cells, fuel cells, or a DC power source composed of a secondary battery such as a lithium ion battery.

The power conditioner includes an inverter , a connector relay , a measurement unit , and a power conditioner control apparatus The inverter performs a switching operation in response to the gate signal Sg received from power conditioner control apparatus , converts the DC power input from the dispersed type power supply to AC power, and outputs to the terminal Tb side.

Note that when the sending of the gate block signal Sb is released, gate block is canceled, the inverter resumes operation according to a gate signal Sg. Connector relay is provided on a line connecting the inverter and the terminal Tb.

Why under voltage relay protection is important?

Connector relay is opened from the power conditioner control apparatus and receives a relay Kairetsu signal Sr, which paralleled the dispersed type power supply from the power system Measurement unit measures the voltage value at the terminal Tb, and outputs the detected value of the measured AC voltage voltage value V s to the power conditioner control apparatus Further, the measuring unit measures the current flowing from the power conditioner to the electric power system through a terminal Tb, the detection value of the measured alternating current current value I s to the power conditioner control apparatus Output.

Figure 2 is a block diagram showing a configuration of a power conditioner control apparatus of the present embodiment. Power conditioner control apparatus includes an inverter driving unit and the system interconnection protection device , system interconnection protection device includes a relay operation setting device Inverter drive unit includes the coordinate conversion unit , the active current controller , the reactive current controller , the coordinate transformation unit , PWM signal generator Coordinate conversion unit performs coordinate transformation of the current value I s with the output current phase value theta s, calculates the effective current detection value I p active ingredient and reactive current detected value I q reactive component.

Coordinate conversion unit , the active current detection value I p to the active current controller , the reactive current controller a reactive current detection value I q, and output respectively. System interconnection protection device includes a relay operation setting unit , a phase detector , a passive islanding detection unit , a phase shift applying section , a frequency relay , and a voltage relay The frequency detecting unit is shared by the system interconnection protection device and the relay operation setting device , the frequency detecting unit is also a component of the system interconnection protection device will be described in this item.

Frequency detector , the voltage value V s obtained from the measuring unit detects the frequency f v of the system voltage, phase detector , and outputs to the phase shift applying section and the angular acceleration calculating unit ,. Phase detector detects the phase theta v of the system voltage, and outputs to the passive islanding detection unit and the phase shift applying section using the frequency f v of the acquired system voltage from the frequency detecting unit Passive islanding detection unit monitors the phase theta v of the system voltage, detects the voltage phase jump caused by a single operation.

Passive islanding detection unit sends a gate block signal Sb to the gate circuit included detects a voltage phase jump in the inverter , thereby disconnecting the dispersed type power supply from the power system by a gate block of inverter Phase shift applying section acquires the phase theta v of the system voltage from the phase detector , and acquires a frequency f v of the system voltage from the frequency detecting unit The phase shift applying section calculates the shift amount of phase theta sft corresponding to the frequency f v of the system voltage.

Details are as follows. Figure 6 is a frequency deviation of the phase shift applying section - shows the phase characteristic reactive power characteristic. By shifting the output current phase theta s relative phase theta v of the system voltage, the inverter , to supply the reactive power in accordance with the phase shift amount theta sft to the power system As shown in FIG. Therefore, when the dispersed type power supply is system interconnection, reactive power load requires is supplied all from the power system On the other hand, when the dispersed type power supply transitions to the isolated operation from the system interconnection, since the reactive power is insufficient load requires, the frequency f v of the voltage of the power conditioner , shown in FIG.

Frequency relay , the frequency f v of the system voltage obtained from the frequency detector , the frequency f v of the system voltage exceeds the upper limit value frequency increase , or below the lower limit frequency reduction Kotono to detect. An increase or frequency decrease frequency, when the detected continuously beyond the detection timing, frequency relay sends a gate block signal Sb to the gate circuit included in the inverter , and the connector relay performing transmission of disconnection signal Sr for. The frequency relay , "islanding condition", "FRT conditions", corresponding to each of the "system interconnection condition", the upper limit value and the lower limit value, holds the detected timed, from the relay operation setting device When receiving the setting signal Sd, the upper and lower limit values of the frequency f v of the system voltage, and the respective detection time period is changed to a value corresponding to the disconnection condition shown on the configuration signal Sd.

Voltage relay holds an upper limit value and the lower limit value of the voltage value V s of the electric power system , and the detection timing.

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Voltage relay obtains from the measurement unit a voltage value V s of the electric power system , the voltage value V s of the electric power system exceeds the upper limit value over-voltage , or below the lower limit undervoltage the detection of that. The overvoltage or undervoltage, when the detected continuously beyond the detection timing, the voltage relay sends a gate block signal Sb to the gate circuit included in the inverter , and, with respect to connector relay performing transmission of disconnection signal Sr Te.

Further, the voltage relay receives the setting signal Sd from the relay operation setting device , the upper limit value and the lower limit value of the voltage value V s of the electric power system , and the respective detection time period is shown in the setting signal Sd to change to a value corresponding to the solution column conditions. Relay operation setting unit includes a frequency detecting unit , an angular acceleration calculation unit , and a protective relay settings determination unit Each disconnection condition, for each frequency and voltage, the upper limit value and the lower limit value, and includes detection timing.

First, the frequency detector detects the frequency f v of the system voltage S For more details, the following procedure. The "islanding condition", by detecting whether the dispersed type power supply is performing a single operation, with disconnection conditions for prompt Kairetsu if performed alone operation dispersed type power supply is there.

https://wieloaglycerno.tk The power supply amount to the electric power system before and after the dispersed type power supply is isolated operation since fluctuates, the frequency variation of the power system may occur. The "FRT condition", a disconnection condition for disturbance of the system voltage and voltage frequency of the power system is not Resshi solutions of distributed power source is within a predetermined range.


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  4. Description;

The "system interconnection conditions", abnormality occurs in the system voltage and voltage frequency of the power system , or, in the case where an abnormality occurs in the output voltage and the voltage frequency of the power conditioner , to detect the anomalous dispersion a disconnection condition for disconnection type power supply System interconnection conditions islanding condition is a condition for detecting an abnormality of the electric power system in the case of non-FRT conditions.

Finally, protection relay setting determination unit , a setting signal Sd indicating the disconnection condition of the determined protection relay, the frequency relay , and outputs to the voltage relay S Operation example 1 of the relay operation setting device 5, in a distributed power supply system according to this embodiment, a diagram showing the configuration and operation of the protection relay when the frequency fluctuation of the system voltage occurs. Incidentally, the reference frequency f S of the system voltage and 50 Hz, disconnection condition shown in FIG.

The operation and disconnection condition of the frequency relay in a distributed power supply system according to this embodiment will be described with reference to FIG.