WO2013118265A1 - Système et procédé de commande de stabilisation de système électrique - Google Patents

Système et procédé de commande de stabilisation de système électrique Download PDF

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Publication number
WO2013118265A1
WO2013118265A1 PCT/JP2012/052919 JP2012052919W WO2013118265A1 WO 2013118265 A1 WO2013118265 A1 WO 2013118265A1 JP 2012052919 W JP2012052919 W JP 2012052919W WO 2013118265 A1 WO2013118265 A1 WO 2013118265A1
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WO
WIPO (PCT)
Prior art keywords
control
power
predetermined
storage device
generator
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PCT/JP2012/052919
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English (en)
Japanese (ja)
Inventor
弘一 原
大一郎 河原
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株式会社日立製作所
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Publication date
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Priority to PCT/JP2012/052919 priority Critical patent/WO2013118265A1/fr
Publication of WO2013118265A1 publication Critical patent/WO2013118265A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means

Definitions

  • the present invention relates to a power system stabilization control system and method.
  • the power system is a collection of many synchronous generators.
  • a specific synchronous generator may be shaken due to the influence of an accident.
  • the phase difference between the plurality of synchronous generators may become too large to operate stably. This phenomenon is called step-out.
  • FIG. 9 shows the characteristics of a generator that is shaken by the influence of a grid fault (hereinafter sometimes abbreviated as an accident).
  • the horizontal axis of FIG. 9 indicates the generator internal phase difference angle that is the phase difference, and the vertical axis indicates the generator output.
  • acceleration energy As shown in the lower side of FIG. 9, when the locus of the generator output curve is lower than the output before the accident (the output value of the initial operating point), the power generation is maintained in order to maintain the output before the accident occurs.
  • the rotor of the machine accelerates.
  • a period in which the rotation of the generator accelerates is referred to herein as an acceleration period Tsu.
  • the time integration of the generator output curve in this acceleration period Tsu is called acceleration energy.
  • deceleration energy when the locus of the generator output curve is higher than the output before the accident, the generator rotor decelerates.
  • a period during which the rotation of the generator is decelerated is referred to herein as a deceleration period Tsd.
  • the time integration of the generator output curve in the deceleration period Tsd is called deceleration energy.
  • the transient stability of the generator can be evaluated by comparing the magnitude relationship between acceleration energy and deceleration energy. If the acceleration energy is greater than the deceleration energy, the generator may step out.
  • Patent Documents 1 and 2 a control method for stabilizing the generator by absorbing the acceleration energy of the generator is known.
  • the present invention has been made in view of the above-described problems, and an object of the present invention is to determine the control operation of the power storage device connected to the power generation device based on information obtained from a plurality of locations in the power system. It is an object of the present invention to provide a power system stabilization control system and method. Another object of the present invention is to provide a power system stabilization control system capable of determining and storing a control operation for suppressing a predetermined influence caused by a predetermined accident by a prior calculation before the occurrence of the predetermined accident. It is to provide a method.
  • an electric power system stabilization control system for stabilizing an electric power system including a plurality of power generation devices, and any of the plurality of power generation devices.
  • the power storage device is connected to the at least one power generation device
  • the control system is connected to the power storage device
  • the control system is connected to the power storage device of the power system
  • the predetermined power generation device and the predetermined power generation device The control operation of the power storage device is determined based on the system operation information respectively acquired from a plurality of locations other than the above, and a control signal based on the determined control operation is output to the power storage device to control the power storage device.
  • the control system may determine and store a control operation for suppressing a predetermined influence due to a predetermined accident by pre-calculation before the predetermined accident occurs.
  • the whole lineblock diagram containing a power system stabilization control system The flowchart which shows the process performed with a management computer.
  • the flowchart which shows the other process performed with a management computer The flowchart which shows the process performed with a control terminal.
  • the flowchart which shows the process which concerns on 2nd Example and is performed with a management computer.
  • the storage battery control method is formulated by taking into account not only the self-end information of the generator in which the storage battery is installed but also the information of the entire system, thereby stabilizing the entire system. Plan.
  • the transient stability of the power system is simulated in advance in consideration of not only information on the target generator but also information on other generators and the like.
  • Transient stability is the degree to which stable operating conditions are restored again in the event of a sudden disturbance such as a short circuit or ground fault when the power system is stably transmitting power under certain conditions.
  • system operation information for the entire power system is collected, and a storage battery control method (control operation) is formulated in a state in which the entire power system is simulated.
  • the formulated control operation is transmitted to the control terminal for controlling the storage battery via the transmission line.
  • the control terminal controls the storage battery according to the received control operation.
  • the control operation of the storage battery for optimizing the entire system can be determined in a state of simulating the entire power system. Therefore, the power system can be more appropriately stabilized, and the reliability of the system is improved.
  • FIG. 1 shows the configuration of the entire system including the power system stabilization control system.
  • the configuration of the power system varies from country to country.
  • the configuration shown in FIG. 1 is an example.
  • a plurality of generators 2 as “power generation devices” are connected to the power system 1.
  • the generator 2 is configured as, for example, a synchronous generator, but it is not necessary that all the generators 2 included in the power system 1 are synchronous generators.
  • other types of generators such as a solar power generator May be mixed in the system.
  • a storage battery 50 as a “power storage device” is electrically connected in parallel to a predetermined generator 2 among the plurality of generators 2.
  • the storage battery 50 is configured, for example, as a lead storage battery, a nickel / hydrogen storage battery, a lithium ion secondary battery, or a sodium / sulfur battery.
  • a configuration including a capacitor may also be used.
  • the power system stabilization control system includes, for example, a management computer 10 and a control terminal 40 that is communicably connected to the management computer 10 via the transmission path 20. Further, the management computer 10 is also communicably connected via the transmission line 20 to a plurality of information terminals 30 distributed in the power system.
  • the information collection terminal 30 is a device for collecting system operation information of the power system 1 and transmitting it to the management computer 10.
  • Each information collection terminal 30 collects TM (telemeter) data such as terminal voltage, active power, reactive power, load bus voltage, consumed active power, consumed reactive power, etc. of the generator 2 and sends it to the management computer 10.
  • TM telemeter
  • the information collection terminal 30 collects device configuration change data (supervisor data) such as the relay operation state, the circuit breaker open / close state, and its state change, and transmits the collected data to the management computer 10.
  • the management computer 10 is configured as a computer system including, for example, an arithmetic device such as a microprocessor, a storage device such as a main storage device and an auxiliary storage device, and a communication device.
  • the management computer 10 is a computer system for calculating in advance the control method of each storage battery 50 according to the state of the power system 1 by simulation processing. Therefore, the management computer 10 can also be called as a device (storage battery control method creation device) for creating a storage battery control method, for example.
  • the management computer 10 calculates the transient stability according to the dynamic characteristic model of the power system for the accident assumed in advance as the “predetermined accident”. , Determine the presence or absence of step-out, or perform stabilization measures.
  • the management computer 10 determines the storage battery (storage battery to be controlled) 50 to be controlled in accordance with the stabilization measures according to the calculation results.
  • the management computer 10 calculates the charge / discharge control operation of the storage battery 50 to be controlled by simulating the entire power system 1, and relates the charge / discharge control operation, which is the calculation result, to the accident assumed in advance. Register in advance in the control terminal 40 in charge of the target storage battery 50.
  • the control terminal 40 as a “control device” outputs a control signal based on a pre-registered control operation to the storage battery 50 when an assumed accident occurs in the power system 1.
  • FIG. 2 shows a process in which the management computer 10 determines the control operation of the storage battery 50 to be controlled by simulating the entire power system 1.
  • the management computer 10 captures system operation information from each information collection terminal 30 via the transmission path 20 (S100).
  • the system operation information includes the active power and reactive power and voltage of the generator 2, the active power and reactive power of the transmission line, the active power and reactive power and voltage of the load, the operation of the relay, and the switching of the breaker States and changes.
  • the management computer 10 creates a system model based on the system operation information collected from each information collection terminal 30 (S101). Subsequently, the management computer 10 determines a state based on the created system model (S102). In step S102, the collected grid operation information is changed to consistent data.
  • the management computer 10 converts the system operation information collected from each information collection terminal 30 into data consistent with the power system, and obtains a consistent system model.
  • the management computer 10 calculates the transient stability when an assumed accident occurs based on the consistent system model (S103).
  • the dynamic characteristics of the generator 2 when an accident occurs in the current power system state are simulated.
  • the management computer 10 formulates a charge / discharge control method for the storage battery 50 (S104).
  • the charge / discharge control method includes, for example, operation designation information for instructing whether to charge or discharge the storage battery 50, a charge / discharge amount for instructing a current amount to be charged or discharged, and acceleration energy calculated by simulation. Including estimated values.
  • the charge / discharge control method can also be called charge / discharge control operation.
  • step S104 the management computer 10 determines the possibility of step-out for each generator based on the dynamic characteristics of the generator 2 as a result of the simulation process.
  • the management computer 10 creates a charge / discharge control method for preventing the step-out of the storage battery 50 associated with the generator 2 that has been determined to be out of step.
  • the storage battery 50 corresponding to the generator 2 determined to have the possibility of step-out becomes the storage battery to be controlled.
  • the management device 10 does not create a charge / discharge control method in advance for the storage battery 50 associated with the generator 2 that is not likely to step out even if an assumed accident occurs ( S104). This is because it is not necessary to create a charge / discharge control method in advance for the storage battery 50 that is not controlled.
  • the management computer 10 transmits the charge / discharge control method created in step S104 to the control terminal 40 for controlling the storage battery 50 to be controlled via the transmission line 20, and registers the charge / discharge control method in the control terminal 40. (S105).
  • the management computer 10 executes the above-described steps S100 to S105 at a predetermined opportunity (S106).
  • a predetermined opportunity for example, there is a change in the configuration (generator, storage battery, information collection terminal, etc.) managed by the management computer 10.
  • Steps S100 to S105 can also be executed according to instructions from the system administrator.
  • step S104 the system administrator or another computer can also correct the charge / discharge control method created in step S104.
  • FIG. 3 shows a process for the management computer 10 to monitor a system fault.
  • the management computer 10 monitors whether or not a predetermined accident (accident assumed in advance) has occurred in the power system 1 based on the system operation information received from each information collection terminal 30 (S110). If the management computer 10 determines that a predetermined accident has occurred (S110: YES), the management computer 10 notifies the control terminal 40 (control terminal to be controlled) affected by the accident of the accident (S111).
  • FIG. 4 is a flowchart showing processing executed by the control terminal 40.
  • the control terminal 40 determines whether a charge / discharge control method has been received from the management computer 10 (S120).
  • the control terminal 40 stores the received charge / discharge control method in a memory or the like (S121).
  • control terminal 40 determines whether an accident has occurred in the power system 1 (S122).
  • the presence or absence of an accident can be known by notification from the management computer 10.
  • the structure which can detect the accident of the electric power grid 1 directly by the control terminal 40 may be sufficient.
  • control terminal 40 When the control terminal 40 knows that an accident has occurred (S122: YES), the control terminal 40 refers to the output of the generator 2 in charge and the internal phase difference angle (S123).
  • the generator 2 in charge is the generator 2 controlled by the control terminal 40.
  • the control terminal 40 corrects the charge / discharge control method stored in step S121 based on the output of the generator 2 and the internal phase difference angle checked in step S123 (S124).
  • the control terminal 40 compares the acceleration energy of the generator when the generator dynamic characteristics are simulated in advance with the acceleration energy of the generator when an accident actually occurs. When determining that the actual acceleration energy is larger than the acceleration energy at the time of simulation, the control terminal 40 increases the charge amount of the storage battery 50 (S124). This is because when the acceleration energy is larger than the value at the time of simulation, the possibility of step-out increases.
  • the control terminal 40 controls the operation of the storage battery 50 according to the charge / discharge control method corrected in step S124 (S125). That is, in step S125, the control terminal 40 instructs the storage battery 50 to start the charge / discharge operation and also instructs the charge / discharge amount.
  • FIG. 5 With reference to FIG. 5, the charging / discharging control operation
  • the upper side of FIG. 5 shows a case where this embodiment is not applied.
  • the lower side of FIG. 5 shows a simulation result of the dynamic characteristics of the generator, which is calculated by calculating the transient stability.
  • the horizontal axis represents the generator internal phase difference angle ⁇
  • the vertical axis represents the generator output P.
  • the initial operating point is the output of the generator 2 before the accident occurs. Unless an accident occurs, the generator 2 basically operates to maintain the output at the initial operating point. However, when an accident occurs in the power system 1 at time t0, the output of the generator 2 decreases until the accident is removed at time t1, and a locus like the generator characteristic 201 is drawn.
  • the output of the generator 2 draws a locus like the generator characteristic 202 and rises. Eventually, at time t2, the output of the generator 2 reaches the output of the initial operating point.
  • the output of the generator 2 is a value below the initial operating point as indicated by the generator characteristics 201 and 202 from the time t0 to the time t2 when the accident occurs.
  • the generator 2 In the low output state from time t0 to time t2, the generator 2 tries to return the output to the generator output before the accident (output of the initial operating point). Therefore, the generator 2 accelerates during the acceleration period Tsu from time t0 to time t2.
  • the output of the generator 2 transitions to a state exceeding the initial operating point as indicated by the generator characteristics 203.
  • the output of the generator 2 exceeds the initial operating point from time t2 to time t3 due to, for example, imbalance between acceleration energy and deceleration energy and inertial force.
  • the generator 2 decelerates during the deceleration period Tsd from time t2 to time t3 in order to return the output to the initial operating point.
  • charging control of the storage battery 50 is performed in the acceleration period Tsu.
  • discharge control of the storage battery 50 is performed.
  • the charge control by charging the storage battery 50, a part of the acceleration energy of the generator 2 is absorbed.
  • the discharge control the storage battery 50 is discharged.
  • the total power generation amount is larger than the total demand. Therefore, in order to balance the total power generation amount and the total demand, the demand is increased by using the storage battery 50 in the charging mode. As a result, the total power generation and total demand will be balanced.
  • the total power generation amount is smaller than the total demand. Therefore, in order to balance the total power generation amount and the total demand, the power generation amount is increased by using the storage battery 50 in the discharge mode. As a result, the total power generation and total demand will be balanced.
  • the dynamic characteristic 200A of the generator 2 changes as shown as the generator characteristic 204 on the lower side of FIG.
  • the acceleration period Tsu1 of the generator 2 is shortened, according to this embodiment, the fluctuation of the generator 2 converges early. Therefore, according to the present embodiment, it is possible to prevent the generator 2 that may be out of step from being stepped out in advance and to operate the generator 2 more stably. As a result, in this embodiment, the power system 1 can be more appropriately managed to increase the stability, and the reliability can be improved.
  • the generators 2 located particularly close to each other are easily influenced by each other. Therefore, it is necessary to appropriately control the operation of the storage battery 50 after grasping the operation state of the entire power system. is there.
  • FIG. 6 shows an example of a method for determining the control operation of the storage battery after grasping the operation state of the entire power system.
  • the generator 2 (GA), the generator 2 (GB), and the generator 2 (GC) are connected to the power system, and the output end of the generator 2 (GA) is connected.
  • a storage battery 50 is connected.
  • the dynamic characteristic of the generator 2 (GA) from the accident occurrence time t0 to the current time after several milliseconds has elapsed is shown as a generator characteristic 301.
  • the dynamic characteristic of the generator 2 (GB) from the accident occurrence time t0 to the current time is shown as a generator characteristic 302.
  • the dynamic characteristic of the generator 2 (GC) from the accident occurrence time t0 to the current time is shown as a generator characteristic 303.
  • the generator 2 (GA) is once accelerated and then enters a deceleration region.
  • the generator GB and the generator GC are still accelerating as indicated by the generator characteristics 302 and 303.
  • the control terminal 40 commands the storage battery 50 to discharge.
  • generator 2 (GB) and generator 2 (GC) are still accelerating. Therefore, when the storage battery 2 (GA) located in the vicinity is discharged, it may adversely affect other nearby generators 2 (GB) and 2 (GC).
  • the charging / discharging of the storage battery 50 is performed in consideration of the situation of other generators 2 existing within a predetermined range that may be affected by the charging / discharging of the storage battery 50.
  • a control method is determined in advance, and the determined charge / discharge control method is registered in the control terminal 40.
  • the charge / discharge control method is created and registered in advance only for the storage battery 50 corresponding to the generator 2 that has been determined to be out of step by the simulation process. Therefore, according to the present embodiment, it is not necessary to formulate the charge / discharge control method for every assumed accident for all the storage batteries 50 included in the power system, and the charge / discharge control method is formulated within a necessary range. Good. For this reason, the process in the management computer 10 can be simplified and the calculation load of the management computer 10 can be reduced.
  • control terminal 40 refers to the current state of the generator 2 associated with the storage battery 50 in charge of the own terminal when an accident occurs, and from the management computer 10 based on the current state.
  • the charge / discharge control method registered in advance is corrected. Therefore, the control terminal 40 can quickly respond to the actual change in the generator characteristics with a small calculation load.
  • the management computer 10 is configured to correct the simulation result (charge / discharge control method created in advance) at the time of an accident, the time until the correction process is completed and notified to the control terminal 40 (time of the correction process) Time required for transmission). Therefore, compared with the present embodiment in which the control terminal 40 performs correction processing, the response to changes in generator characteristics is delayed.
  • the management computer 10 acquires information (correction information) necessary for the correction process from the generator 2 to be controlled. Then, it is included in the accident occurrence notification and notified to the control terminal 40 (S111A).
  • the correction information includes, for example, the output of the generator and the internal phase difference angle.
  • the management computer 10 since the management computer 10 notifies the control terminal 40 of the correction information, the management computer 10 not only determines the state of the generator 2 corresponding to the storage battery 50 to be controlled, but also its power generation. The state of other generators 2 existing around the machine 2 can also be notified to the control terminal 40. Therefore, the control terminal 40 can correct the charge / discharge control method registered in advance in consideration of the states of the plurality of generators 2.
  • the management computer 10 calculates the correction amount and notifies the control terminal 40 when an accident occurs.
  • the management computer 10 refers to the output of the generator 2 and the internal phase difference angle within a predetermined range as correction information (S112). ).
  • the generator 2 within the predetermined range includes not only the generator affected by the accident (the generator associated with the storage battery 50 to be controlled) but also other generators that can be affected by the output change of the generator. Is also included. Which range of generators is included in the affected range is set in advance in the management computer 10 for each assumed accident.
  • the management computer 10 calculates a correction amount for correcting the charge / discharge control method formulated in advance for the storage battery 50 to be controlled based on the correction information acquired from the plurality of generators (S113). The amount is transmitted to the control terminal 50 (S114).
  • the management computer 10 calculates the correction amount for correcting the charge / discharge control method in consideration of the states of the plurality of generators 2, so that the correction accuracy is higher than that in the first embodiment. Can improve.
  • this invention is not limited to the Example mentioned above.
  • a person skilled in the art can make various additions and changes within the scope of the present invention.
  • the present invention can be applied to other generators other than the synchronous generator, such as a solar power generator.

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

L'invention a pour objet de supprimer une oscillation d'un générateur par commande appropriée d'une batterie d'accumulateurs lorsqu'un accident survient. Une batterie d'accumulateurs (50) est connectée à au moins un générateur d'une pluralité de générateurs (2). Un système de commande servant à commander le fonctionnement de la batterie d'accumulateurs comprend un ordinateur de gestion (10) pour gérer un système électrique entier et un terminal de commande (40) connecté à la batterie d'accumulateurs (50). Sur la base d'informations de fonctionnement de système obtenues auprès d'un générateur prédéterminé connecté à la batterie d'accumulateurs et des autres générateurs de la pluralité de générateurs à l'exception du générateur prédéterminé dans le système électrique, l'ordinateur de gestion (10) détermine préalablement une opération de commande de la batterie d'accumulateurs. L'ordinateur de gestion (10) enregistre l'opération de commande déterminée dans le terminal de commande (40). Lorsqu'un accident survient, le terminal de commande (40) délivre un signal de commande basé sur l'opération de commande enregistrée à la batterie d'accumulateurs (50).
PCT/JP2012/052919 2012-02-09 2012-02-09 Système et procédé de commande de stabilisation de système électrique WO2013118265A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016203587A1 (fr) * 2015-06-17 2016-12-22 株式会社 東芝 Dispositif de génération de signal simulé, procédé de génération de signal simulé, et programme informatique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10285804A (ja) * 1997-03-31 1998-10-23 Hitachi Ltd 電力系統安定度維持装置
JP2001352680A (ja) * 2000-06-08 2001-12-21 Hitachi Ltd 系統安定化制御方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10285804A (ja) * 1997-03-31 1998-10-23 Hitachi Ltd 電力系統安定度維持装置
JP2001352680A (ja) * 2000-06-08 2001-12-21 Hitachi Ltd 系統安定化制御方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016203587A1 (fr) * 2015-06-17 2016-12-22 株式会社 東芝 Dispositif de génération de signal simulé, procédé de génération de signal simulé, et programme informatique
JPWO2016203587A1 (ja) * 2015-06-17 2017-06-22 株式会社東芝 模擬信号生成装置、および模擬信号生成方法、およびコンピュータプログラム
US10310018B2 (en) 2015-06-17 2019-06-04 Kabushiki Kaisha Toshiba Device for generating a simulation-signal serving as a command signal of charge/discharge for an energy-storage system, method for generating the simulation signal, and non-transitory computer readable medium

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