JP2001231171A - Operation control device for plurality of distributed power supplies - Google Patents

Operation control device for plurality of distributed power supplies

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Publication number
JP2001231171A
JP2001231171A JP2000045065A JP2000045065A JP2001231171A JP 2001231171 A JP2001231171 A JP 2001231171A JP 2000045065 A JP2000045065 A JP 2000045065A JP 2000045065 A JP2000045065 A JP 2000045065A JP 2001231171 A JP2001231171 A JP 2001231171A
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Japan
Prior art keywords
distributed power
information
electric
power supply
control
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JP2000045065A
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Japanese (ja)
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JP3705409B2 (en
Inventor
Chikashi Nakazawa
親志 中沢
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Fuji Electric Co Ltd
富士電機株式会社
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Abstract

(57) [Summary] [PROBLEMS] To improve the accuracy of islanding detection and suppress voltage fluctuations in the system. SOLUTION: A periodic and minute fluctuation signal is superimposed on an output set value indicating that a plurality of distributed power supplies connected to an electric power system and operating in an interconnected state are disconnected from the electric power system to be in an independent operation state. Detected from the electricity amount information of each distributed power supply
The present invention relates to an operation control device for a plurality of distributed power sources that controls the distributed power sources to be disconnected at a power receiving point to operate independently or to stop the operation. A distributed power source,
For example the generator G amplitude variation signal superimposed on the output set value of 1, the frequency or phase, the generator G 1 of the electrical quantity information and the other generator G 2, G 3, ......, is transmitted from the G n controlled on the basis of that electric quantity data, to detect the islanding state from said electrical quantity information of the generator G 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for detecting whether a plurality of distributed power supplies connected to an electric power system have been operated independently and disconnecting the distributed power supplies from the power system for independent operation. Alternatively, the present invention relates to an operation control device for stopping the operation.

[0002]

2. Description of the Related Art In a power system in which a plurality of distributed power supplies are connected to a distribution line from a higher system via a distribution substation, a breaker of the distribution substation is opened for some reason ( As a result, the distributed power supply enters an isolated operation state), and external loads such as general consumers connected below this circuit breaker should originally be blackouts, but are not connected to the distribution line. If the decentralized power supply is operated alone, the external load is continuously supplied with power. This state is extremely dangerous for maintenance personnel, etc. who assume that the lower system will be out of power due to the opening of the circuit breaker at the distribution substation. Since unstable power may be supplied, such an isolated operation state was reliably detected, and the distributed power supply was disconnected from the system by opening the circuit breaker at the receiving point to which the distributed power supply was connected. In addition, it is necessary to operate the station independently or stop the operation.

[0003] When detecting the above-mentioned isolated operation of the distributed power supply, it is necessary to consider the impedance of the system and the state of the load, etc., to ensure that the detection can be performed within a required time, and to detect the frequent unnecessary disconnection. It is required that the sensitivity be high and that the active signal be of such an extent that the influence on the system is not substantially a problem.

On the other hand, there is also known a system in which a periodic and minute fluctuation signal is constantly superimposed on an output voltage set value of a distributed power supply, and an isolated operation is detected by monitoring a change in frequency at a power receiving point ( For example, “Equivalent conversion method of synchronous operation detection function for synchronous generator-reactive power fluctuation method and reactive power compensation method-” (Transactions of the Institute of Electrical Engineers of Japan, Vol. 119, No. 1, 1999, 1999)
Year)). According to this method, it is possible to detect even when the power flow at the power receiving point is almost zero, and there is an advantage that there is no detection dead zone.

[0005]

However, in the above-described system for detecting the isolated operation of the distributed power supply from the frequency change of the power receiving point, the output voltage set value of each distributed power supply is independent of the other distributed power supplies. Since the fluctuation signals are superimposed, the output voltages including these fluctuation signals interfere with each other,
There has been a problem that the amount of frequency fluctuation at the receiving point may decrease, and the islanding detection sensitivity may decrease. Further, there is also a disadvantage that voltage fluctuations in the system become large due to the superposition of random fluctuation signals from a plurality of distributed power supplies, which adversely affects power quality.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an operation control apparatus for a plurality of distributed power supplies, which can detect isolated operation with high sensitivity and can prevent a decrease in power quality.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 is an invention in which a plurality of distributed power supplies connected to an electric power system and connected to each other are disconnected from the electric power system to operate independently. The state is detected from the electric quantity information of each distributed power source in which a periodic and minute fluctuation signal is superimposed on the output set value, and the distributed power source is disconnected at the receiving point to operate independently. Or an operation control device for a plurality of distributed power supplies that controls to stop or stop the operation, the amplitude, frequency, or phase of the fluctuation signal superimposed on the output set value of one distributed power supply, Control based on the electric quantity information of one distributed power supply and electric quantity information transmitted from another distributed power supply, and detecting the isolated operation state of the distributed power supply from the electric quantity information of the one distributed power supply Is what you do.

According to a second aspect of the present invention, the amplitude, frequency, or phase of the fluctuation signal superimposed on the output set value of one distributed power supply is calculated by using the electric quantity information of the one distributed power supply and other distributed information. The control is performed based on electric quantity information transmitted from the type power supply, and the isolated operation state of the distributed power supply is detected from the electric quantity information of the other distributed power supply.

According to a third aspect of the present invention, the amplitude, frequency or phase of the fluctuation signal to be superimposed on the output set value of one distributed power supply is calculated by using the electric quantity information of the one distributed power supply and other distributed information. A control is performed based on the electric quantity information transmitted from the type power supply, and the isolated operation state is detected from the electric quantity information of the one distributed power supply and the other distributed power supply.

According to a fourth aspect of the present invention, there is provided the operation control device for a plurality of distributed power supplies according to the first, second, or third aspect, wherein a distribution substation provided on a higher system side of each distributed power supply is shut off. The islanding operation state is detected by further taking into account the opening / closing information.

The invention according to claim 5 is the invention according to claims 1, 2, 3
Alternatively, in the operation control device for a plurality of distributed power supplies described in 4, the time information obtained by using a global positioning system (GPS) is added to the electric quantity information.

[0012] The invention according to claim 6 is the invention according to claims 1, 2, and 3.
In the operation control device for a plurality of distributed power supplies described in 3, 4 or 5, the electric quantity information is an output voltage and a current of each distributed power supply at a power receiving point, and the electric quantity information is transmitted to each distributed power supply. Are transmitted and received between them.

According to a seventh aspect of the present invention, in the operation control device for a plurality of distributed power supplies according to the fourth aspect, the electric quantity information is an output voltage and a current of each distributed power supply at a receiving point. The quantity information and the circuit breaker switching information are transmitted and received between the distribution substation and each distributed power source.

The transmission / reception means of the electric quantity information and the circuit breaker switching information according to claim 6 or 7 may use a public line as described in claim 8 or spread spectrum communication as described in claim 9. It is good to use.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing the configuration of the embodiment. In the figure, reference numeral 1 denotes a distribution line, and a distribution substation 2
To the upper system (infinity bus) 3 via.
Incidentally, distribution substation 2 is provided with a transformer Tr and breaker 4 0.

The distribution line 1 includes power receiving point circuit breakers 4 1 , 4 2 ,.
, 4 n , through the generator circuit breakers 5 1 , 5 2 , ..., 5 n
Generators G 1 , G 2 ,... Such as synchronous generators as distributed power sources
, Gn are connected to each other. Further, the generator circuit breaker 5 1, 5 2, ..., 5 to the distribution line 1 side of n is plant load 7 1, 7 2, ..., 7 n are respectively connected, each generator G 1 , G 2 ,..., G n .
Reference numeral 8 denotes an external load of a general customer or the like connected to the distribution line 1, and power is directly supplied from the distribution substation 2 in normal times.

The receiving point breaker 4 1, 4 2, ..., 4 n a generator breaker 5 1, 5 2, ..., between 5 n, i.e. the receiving point, the potential transformer PT and current transformer CT is connected, the generator G 1, G 2, ......, a voltage output from the G n,
The electric quantity information of the current is detected. These electrical quantity information, each generator G 1, G 2, ......, 6 1 having the islanding detection function provided corresponding to G n,
6 2, ..., are input to 6 n, these units 61,
From 6 2 ,..., 6 n , each generator G 1 , G 2 ,.
Is output periodically and minutely fluctuating signal superimposed on the output voltage set value. Further, each device 6 1 , 6 2 ,..., 6 n
From the receiving point breaker 4 1, 4 2, ..., 4 n, the generator breaker 5 1, 5 2, ..., disconnecting command to 5 n, the generator G 1, G
2 ,..., Gn are respectively output as stop commands.

On the other hand, ST is a global positioning system (GP)
S), and the satellite S
The time information transmitted from T is the GPS antenna AT 0 , A
T 1, AT 2, ..., power distribution via the AT n substations 2 and the units 61 and 62 2, ..., are transmitted to the controller in the 6 n. These control units have a function of receiving the time information and adding it to the electric quantity information.

The distribution substation 2 and each of the devices 6 1 ,
6 2, ..., corresponding to 6 n, PHS slave station PHS 0, PH
S 1, PHS 2, ......, PHS n is provided with, PHS master station CS 0 corresponding to these, CS 1, CS 2, ...... ,
CS n are connected by a public line 9. The PHS slave station and the master station, and a communication system constituted by a public line 9, the opening and closing information and circuit breakers 4 0 in distribution substations 2, the units 61 and 62 2, ..., is 6 n The collected generators G 1 ,
G 2, ......, is intended for transmitting and receiving mutual electrical quantity information of G n.

The distribution substation 2 and each of the devices 6 1 , 6 2 ,.
As a communication system between..., 6 n , a mobile phone system using the public line 9 may be used in addition to the PHS. Alternatively, a spread spectrum (SS) communication system may be used without using a public line. As is well known, this spread spectrum communication uses a PN code to perform a Fourier transform (SS modulation) on an information signal on the transmission side and then wirelessly transmits the information signal, and a reception side uses the same and synchronized PN code as the transmission side. By performing inverse Fourier transform (correlation processing) and performing filter processing, noise and multipath noise superimposed on the received signal
This is a communication method capable of extracting only information signals at a large level by reducing the power density of interference waves due to fading (these waves are not subjected to SS modulation). Using this spread spectrum communication, it is possible to eliminate the effects of noise and multipath fading on the receiving side, and because the power density of the transmitted signal is low, it may become a noise source or crosstalk to surrounding equipment. There is no inconvenience to cause.

Now, the operation of FIG. 1 will be described. The devices 6 1 , 6 2 ,..., 6 n having the islanding detection function are controlled by the generators G 1 , G 2 ,. A periodic and minute fluctuation signal is constantly superimposed on the output voltage set value for Gn . Here, each of the devices 6 1 , 6 2 ,..., 6 n converts the amplitude, frequency, or phase of the fluctuating signal output by itself into the electric quantity information of the generator under the control of the device, the public line (PH).
It can be arbitrarily controlled based on electricity amount information of a generator under the control of another device sent via S) and time information by GPS. In the present embodiment, in order to prevent the output voltages of the generators G 1 , G 2 ,..., G n on which the fluctuation signals are superimposed from interfering with each other or causing voltage fluctuations in the system, The amplitude, frequency, or phase of the fluctuation signal of the own device is appropriately controlled with reference to the output voltages and currents of the generators managed by the own device and the other devices described in the above. Specifically, while referring to the electric quantity information of the other apparatus (the fluctuation signal is superimposed), the interference of the output voltage and the voltage fluctuation of the system with the electric quantity information of the own apparatus (the same) are considered. The amplitude, frequency or phase of the fluctuation signal on the own device side is appropriately adjusted so as not to occur. Note that the time information is not necessarily indispensable for controlling the fluctuation signal,
By being added to the transmitted / received electric quantity information, it is useful in various data processing such as identification of the time when the isolated operation occurs.

Each of the devices 6 1 , 6 2 ,..., 6 n is a generator G 1 , under its own control detected by PT and CT.
G 2, ......, a frequency variation of the electric quantity data of G n (voltage), the generator under its own control can detect respectively whether interconnected operation state or islanding state. Here, islanding state and the generator G 1 of a plurality, G 2, ......, G n breaker 4 0 distribution substation 2 for some reason when it is interconnected operation to the power system Indicates that the generator under its own control is in the linked operation state, based on the electricity amount information of the generator under the control of the other device sent via the public line (PHS). It is possible to detect whether the vehicle is in the islanding operation state. Each device 61 opening and closing information via the public line (PHS) of the circuit breaker 4 0 distribution substations 2, 6 2, ...
, 6 n , the isolated operation state of each of the generators G 1 , G 2 ,..., G n can be detected from this information. Thus, each device 6 1 , 6 2 ,..., 6 n
Since not only the electricity amount information of the generator under its own control but also the electricity amount information of the generator under the control of other devices and the circuit breaker switching information of the distribution substation 2 are used for the islanding operation detection, the detection accuracy is high. Can be further increased.

When each of the devices 6 1 , 6 2 ,..., 6 n detects the isolated operation state, the power receiving point circuit breakers 4 1 , 4 2 according to a procedure predetermined according to the importance and priority of the in-house load. , ……, 4
When n is opened, the in-house load 7 1 , 7 2 ,.
…, Continue to supply power to 7 n or generator breaker 5 1 ,
5 2 ,..., 5 n are opened and the in-house loads 7 1 , 7 2 ,.
Power supply to n is stopped or generators G 1 , G 2 ,.
..., a stop command is sent to Gn to stop the operation itself. As a result, the generator G 1, G 2 in a state where the breaker 4 0 distribution substation 2 becomes open, ..., generated power of G n is supplied to the external load 8 through the distribution line 1 There is no danger, and the safety of maintenance personnel is not threatened, and there is no worry about unstable power being supplied to the external load 8.

According to this embodiment, the generators G 1 , G 2 ,.
.., Gn electric quantity information and circuit breaker switching information of the distribution substation 2 are transmitted and received via the public line, so there is no need to install and maintain dedicated transmission equipment, and the economic effect is great. .

[0025]

As described above, according to the present invention, the amplitude, frequency or phase of the fluctuation signal superimposed on the output set value of its own distributed power source is determined with reference to the electric quantity information of another distributed power source. Since the control is performed, it is possible to avoid the interference between the outputs of the respective distributed power sources, to improve the islanding detection sensitivity, and to suppress the voltage fluctuation of the system. Further, by mutually transmitting and receiving the electric quantity information of each distributed power source and the circuit breaker switching information of the distribution substation, it is possible to further improve the accuracy of the islanding operation detection.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

1 distribution line 2 distribution substation 3 upper lines (infinite bus) 4 0 breaker 4 1, 4 2, ......, 4 n receiving point breaker 5 1, 5 2, ......, 5 n generator breaker 6 1 , 6 2 ,..., 6 n Device with islanding detection function 7 1 , 7 2 ,..., 7 n Internal load 8 External load G 1 , G 2 ,..., G n generator Tr transformer vessel PT instrument transformer CT current transformer ST artificial satellite AT 0, AT 1, AT 2 , ......, AT n GPS antenna PHS 0, PHS 1, PHS 2 , ......, PHS n PHS slave station CS 0, CS 1, CS 2, ......, CS n PHS master station

Claims (9)

    [Claims]
  1. When a plurality of distributed power supplies connected to an electric power system and connected to each other are disconnected from the electric power system to enter an independent operation state, a periodic and minute fluctuation signal is output to an output set value. Detected from the electric quantity information of each superimposed distributed power supply,
    In the operation control device for a plurality of distributed power supplies that controls the distributed power supply to be disconnected at the receiving point to operate independently or to stop the operation, the output setting value of one distributed power supply is Controlling the amplitude, frequency or phase of the fluctuating signal to be superimposed on the basis of electric quantity information of the one distributed power supply and electric quantity information transmitted from another distributed power supply; An operation control device for a plurality of distributed power supplies, wherein the independent operation state of the distributed power supplies is detected from the electric quantity information.
  2. 2. A periodic and minute fluctuation signal in an output set value indicates that a plurality of distributed power supplies connected to an electric power system and operating in an interconnected state are disconnected from the electric power system to be in an independent operation state. Detected from the electric quantity information of each superimposed distributed power supply,
    In the operation control device for a plurality of distributed power supplies that controls the distributed power supply to be disconnected at the receiving point to operate independently or to stop the operation, the output setting value of one distributed power supply is Controlling the amplitude, frequency or phase of the fluctuation signal to be superimposed on the basis of the electric quantity information of the one distributed power supply and the electric quantity information transmitted from another distributed power supply; An operation control device for a plurality of distributed power supplies, wherein an independent operation state of the distributed power supply is detected from electric quantity information.
  3. 3. A periodic and minute fluctuation signal in the output set value indicates that a plurality of distributed power supplies connected to the power system and operating in an interconnected state are disconnected from the power system to be in an independent operation state. Detected from the electric quantity information of each superimposed distributed power supply,
    In the operation control device for a plurality of distributed power supplies that controls the distributed power supply to be disconnected at the receiving point to operate independently or to stop the operation, the output setting value of one distributed power supply is Controlling the amplitude, frequency or phase of the fluctuating signal to be superimposed on the basis of electric quantity information of the one distributed power supply and electric quantity information transmitted from another distributed power supply; And an operation control device for a plurality of distributed power supplies, wherein the independent operation state of the distributed power supplies is detected from the electric quantity information of the other distributed power supplies.
  4. 4. The operation control device for a plurality of distributed power supplies according to claim 1, 2, or 3, further taking into account breaker switching information of a distribution substation provided on a higher system side of each distributed power supply. An operation control apparatus for a plurality of distributed power supplies, wherein the operation control apparatus detects a single operation state.
  5. 5. The operation control device for a plurality of distributed power supplies according to claim 1, wherein time information obtained by using a global positioning system is added to the electric quantity information. Characteristic operation control device for multiple distributed power supplies.
  6. 6. The operation control apparatus for a plurality of distributed power supplies according to claim 1, wherein the electric quantity information is an output voltage and a current of each distributed power supply at a power receiving point. An operation control device for a plurality of distributed power supplies, wherein the electric quantity information is transmitted and received between the distributed power supplies.
  7. 7. The operation control device for a plurality of distributed power supplies according to claim 4, wherein the electric quantity information is an output voltage and a current of each distributed power supply at a power receiving point, and the electric quantity information and circuit breaker switching. An operation control device for a plurality of distributed power supplies, wherein information is transmitted and received between a distribution substation and each distributed power supply.
  8. 8. The operation control device for a plurality of distributed power supplies according to claim 6, wherein a public line is used as a transmission / reception means.
  9. 9. The operation control device for a plurality of distributed power supplies according to claim 6, wherein spread spectrum communication is used as a transmission / reception means.
JP2000045065A 2000-02-17 2000-02-17 Operation control device for multiple distributed power sources Expired - Lifetime JP3705409B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007202266A (en) * 2006-01-25 2007-08-09 Omron Corp Detecting method for isolated operation, controller for detection of isolated operation in dispersed power system, isolated operation detector, and dispersed power system
JP2009247210A (en) * 2005-02-17 2009-10-22 Osaka Gas Co Ltd Method and apparatus for detecting individual operation of power generating facility
JP2011523342A (en) * 2008-06-10 2011-08-04 ロールス‐ロイス、パブリック、リミテッド、カンパニーRolls−Royce Public Limited Company Generator network and local electrical system
JP2011205779A (en) * 2010-03-25 2011-10-13 Tokyo Electric Power Co Inc:The Single operation detecting device, distributed power supply unit, system linkage system, single operation detecting method and system linkage control method
KR101126073B1 (en) * 2010-07-27 2012-03-29 국민대학교산학협력단 System for preventing islanding of distributed power in smart grid

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009247210A (en) * 2005-02-17 2009-10-22 Osaka Gas Co Ltd Method and apparatus for detecting individual operation of power generating facility
JP2007202266A (en) * 2006-01-25 2007-08-09 Omron Corp Detecting method for isolated operation, controller for detection of isolated operation in dispersed power system, isolated operation detector, and dispersed power system
JP2011523342A (en) * 2008-06-10 2011-08-04 ロールス‐ロイス、パブリック、リミテッド、カンパニーRolls−Royce Public Limited Company Generator network and local electrical system
JP2011205779A (en) * 2010-03-25 2011-10-13 Tokyo Electric Power Co Inc:The Single operation detecting device, distributed power supply unit, system linkage system, single operation detecting method and system linkage control method
KR101126073B1 (en) * 2010-07-27 2012-03-29 국민대학교산학협력단 System for preventing islanding of distributed power in smart grid

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