WO2021014578A1 - Dispositif de conversion de courant et système d'alimentation électrique distribuée - Google Patents

Dispositif de conversion de courant et système d'alimentation électrique distribuée Download PDF

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Publication number
WO2021014578A1
WO2021014578A1 PCT/JP2019/028885 JP2019028885W WO2021014578A1 WO 2021014578 A1 WO2021014578 A1 WO 2021014578A1 JP 2019028885 W JP2019028885 W JP 2019028885W WO 2021014578 A1 WO2021014578 A1 WO 2021014578A1
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Prior art keywords
power
value
estimated value
interconnection point
conversion device
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PCT/JP2019/028885
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English (en)
Japanese (ja)
Inventor
重政　隆
康晃 三ツ木
克也 平
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東芝三菱電機産業システム株式会社
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Priority to PCT/JP2019/028885 priority Critical patent/WO2021014578A1/fr
Priority to JP2020503341A priority patent/JP7058056B2/ja
Publication of WO2021014578A1 publication Critical patent/WO2021014578A1/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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Definitions

  • An embodiment of the present invention relates to a power conversion device and a distributed power supply system.
  • the distributed power supply is used to compensate for the voltage fluctuation at the interconnection point of the distributed power supply. Injecting reactive power into the interconnection point from. The injection of ineffective power is controlled by a power converter that converts the power of the distributed power source into power according to the power system.
  • the voltage fluctuation at the interconnection point can be caused even in voltage suppression control using a linear approximation formula. It was difficult to control it properly. Therefore, in the distributed power supply system and the power conversion device used for the distributed power supply system, it is desired that the voltage fluctuation at the interconnection point of the distributed power supply can be suppressed more appropriately.
  • An embodiment of the present invention provides a power conversion device and a distributed power supply system capable of more appropriately suppressing voltage fluctuations at interconnection points of distributed power sources.
  • the power of the distributed power supply is converted into AC power corresponding to the power system connected to the infinity bus power system, and the converted AC power is supplied to the power system to disperse the distribution.
  • a power conversion device that connects a mold power supply to the power system, the operation of the main circuit unit that converts the power of the distributed power supply into the AC power corresponding to the power system, and the operation of the main circuit unit.
  • the control unit includes a control unit for controlling, and the control unit uses a Kalman filter corresponding to a non-linear expression to obtain an active power value at an interconnection point with the power system, an ineffective power value at the interconnection point, and the interconnection.
  • the estimated value of the resistance component of the system impedance of the power system Based on the voltage value of the system point, the estimated value of the resistance component of the system impedance of the power system, the estimated value of the reactorance component of the system impedance, and the estimated value of the voltage value of the infinite bus power system are calculated.
  • the power system is based on the estimated value calculation unit, the estimated value of the resistance component of the system impedance, the estimated value of the reactorance component of the system impedance, and the estimated value of the voltage value of the infinite bus power system.
  • An invalid power calculation unit that calculates an invalid power command value of the invalid power supplied to the main circuit unit, and a drive circuit that drives the main circuit unit so as to output a predetermined active power and the invalid power corresponding to the invalid power command value.
  • a power converter with is provided.
  • a power conversion device and a distributed power supply system capable of more appropriately suppressing voltage fluctuations at interconnection points of distributed power sources.
  • FIG. 1 is a block diagram schematically showing a distributed power supply system according to an embodiment.
  • the distributed power supply system 2 includes a power system 4 connected to an infinity bus power system 3, a distributed power supply 6, and a power conversion device 10.
  • the electric power of the electric power system 4 is AC electric power.
  • the electric power of the electric power system 4 is, for example, three-phase AC electric power.
  • the distributed power source 6 is, for example, a solar panel.
  • the electric power of the distributed power source 6 is DC electric power.
  • the power conversion device 10 is connected to the distributed power source 6 and is also connected to the power system 4 via transformers 12, 14 and the like.
  • the power conversion device 10 converts the DC power of the distributed power source 6 into AC power corresponding to the power system 4, and supplies the converted AC power to the power system 4, thereby converting the distributed power source 6 into the power system 4. To interconnect.
  • the distributed power source 6 is not limited to the solar panel, and may be another generator such as a wind power generator or a gas turbine generator. Further, the distributed power source 6 may be, for example, a charge storage element such as a storage battery or a capacitor.
  • a consumer 16 (load) and another generator 18 may be connected in the immediate vicinity of the power system 4.
  • the power conversion device 10 supplies active power to the power system 4 and supplies optimum reactive power to the power system 4.
  • the power conversion device 10 suppresses fluctuations in the voltage of the interconnection point LP with the power system 4 due to the supply of its own active power and the influence of the consumer 16 and the generator 18.
  • FIG. 2 is a block diagram schematically showing a power conversion device of the distributed power supply system according to the embodiment.
  • the power conversion device 10 includes a main circuit unit 40 and a control unit 42.
  • the main circuit unit 40 converts the DC power or AC power supplied from the distributed power source 6 into AC power corresponding to the power system 4.
  • the control unit 42 controls the operation of the main circuit unit 40.
  • the main circuit unit 40 has, for example, a plurality of switching elements, and converts power by turning on / off the plurality of switching elements.
  • the control unit 42 controls the conversion of electric power by the main circuit unit 40 by controlling the on / off switching of the plurality of switching elements of the main circuit unit 40.
  • a well-known inverter circuit is used for the main circuit unit 40.
  • the configuration of the main circuit unit 40 may be any configuration capable of performing the above power conversion.
  • the distributed power supply system 2 further includes, for example, measuring devices 20 and 22.
  • the measuring device 20 detects and detects the voltage value Vdc of the DC voltage input from the distributed power supply 6 to the power conversion device 10 and the current value Idc of the DC current input from the distributed power supply 6 to the power conversion device 10.
  • the voltage value Vdc and the current value Idc are input to the control unit 42.
  • the control unit 42 controls, for example, an MPPT (Maximum Power Point Tracking) method in which DC power is made to follow the maximum power point of the distributed power source 6.
  • the control unit 42 extracts the maximum power point (optimal operating point) of the distributed power source 6 based on the voltage value Vdc and the current value Idc detected by the measuring device 20, and corresponds to the extracted maximum power point.
  • the operation of the main circuit unit 40 is controlled so as to supply the active power to the power system 4.
  • the method of determining the active power supplied from the power conversion device 10 to the power system 4 is not limited to the MPPT method.
  • the active power supplied from the power conversion device 10 to the power system 4 may be determined based on, for example, an active power command value input from a higher-level controller or the like.
  • the control unit 42 may control the operation of the main circuit unit 40 so as to supply the active power according to the input active power command value to the power system 4.
  • the measuring device 22 detects the active power value P of the interconnection point LP with the power system 4 of the power conversion device 10, the invalid power value Q of the interconnection point LP, and the voltage value Vs of the interconnection point LP. , The detected active power value P, the ineffective power value Q, and the voltage value Vs are input to the control unit 42.
  • the control unit 42 includes an estimated value calculation unit 50, an reactive power calculation unit 52, and a drive circuit 54.
  • the control unit 42 inputs the active power value P, the active power value Q, and the voltage value Vs input from the measuring device 22 to the estimated value calculation unit 50.
  • the estimated value calculation unit 50 determines the estimated value ⁇ R of the resistance component R of the system impedance of the power system 4 and the power based on the active power value P, the ineffective power value Q, and the voltage value Vs input from the measuring device 22.
  • the estimated value ⁇ X of the reactance component X of the system impedance of the system 4 and the estimated value ⁇ Vr of the voltage value Vr of the infinite bus power system 3 are calculated.
  • ⁇ (hat) representing an estimated value such as ⁇ R is written directly above R or the like as shown in FIG. 2, but in the specification, due to the convenience of the format, ⁇ It shall be expressed in a staggered manner, such as R.
  • the estimated value calculation unit 50 estimates the system characteristics of the power system 4 based on the active power value P, the reactive power value Q, and the voltage value Vs. At this time, the estimated value calculation unit 50 considers the system model of the power system 4 as the simplest system model of only the resistance component R and the reactance component X of the system impedance, as shown in FIG.
  • the estimated value calculation unit 50 calculates each estimated value ⁇ R, ⁇ X, ⁇ Vr from the active power value P, the inactive power value Q, and the voltage value Vs by using a Kalman filter corresponding to the non-linear formula. More specifically, the estimated value calculation unit 50 calculates each estimated value ⁇ R, ⁇ X, ⁇ Vr from the active power value P, the inactive power value Q, and the voltage value Vs by using the extended Kalman filter. The estimated value calculation unit 50 inputs the calculated estimated values ⁇ R, ⁇ X, and ⁇ Vr to the invalid power calculation unit 52.
  • the Kalman filter corresponding to the non-linear expression is not limited to the extended Kalman filter, and may be, for example, an Ensemble Kalman filter or an Ensemble Kalman filter. However, by using the extended Kalman filter, the calculation load in the estimated value calculation unit 50 can be suppressed as compared with these.
  • the reactive power calculation unit 52 calculates the reactive power command value Q op of the reactive power supplied to the power system 4 based on the estimated values ⁇ R, ⁇ X, and ⁇ Vr input from the estimated value calculation unit 50.
  • the reactive power calculation unit 52 inputs the calculated reactive power command value Q op to the drive circuit 54.
  • the invalid power calculation unit 52 calculates the invalid power command value Q op from each estimated value ⁇ R, ⁇ X, ⁇ Vr by, for example, the following equation (1).
  • "sign" is a sign function.
  • the reactive power command value Q op calculated by the reactive power calculation unit 52 is input to the drive circuit 54, and the voltage value Vdc and the current value Idc of the distributed power source 6 measured by the measuring device 20 are input. ..
  • the drive circuit 54 determines the active power by controlling the MPPT method based on the voltage value Vdc and the current value Idc, and outputs the active power corresponding to the determined active power and the ineffective power command value Q op.
  • Drive 40 The drive circuit 54 switches the on / off of the plurality of switching elements of the main circuit unit 40 to transfer the determined active power and the active power corresponding to the ineffective power command value Q op from the main circuit unit 40 to the power system 4. Supply.
  • the measuring device 22 and the estimated value calculation unit 50 periodically acquire the active power value P, the active power value Q, and the voltage value Vs. Each time the estimated value calculation unit 50 acquires the active power value P, the active power value Q, and the voltage value Vs, the estimated value calculation unit 50 calculates (predicts) each estimated value ⁇ R, ⁇ X, ⁇ Vr, and sets the predicted state. Update the current state from the observation information.
  • the invalid power calculation unit 52 calculates the invalid power command value Q op each time each estimated value ⁇ R, ⁇ X, ⁇ Vr is input from the estimated value calculation unit 50.
  • the drive circuit 54 generates a control signal of the main circuit unit 40 each time an invalid power command value Q op is input, and supplies the active power and the active power to the power system 4 from the main circuit unit 40.
  • the control unit 42 supplies the active power corresponding to the distributed power source 6 to the power system 4, and supplies the reactive power corresponding to the system characteristics of the power system 4 to the power system 4 at any time. ..
  • the active power is supplied from the power conversion device 10 to the power system 4, and the interconnection point LP due to the influence of the consumer 16 and the generator 18 and the like. It is possible to suppress fluctuations in the voltage of. For example, the fluctuation of the voltage value Vs of the interconnection point LP can be suppressed within ⁇ 2%.
  • each estimated value ⁇ R, ⁇ X, ⁇ Vr is calculated by using an extended Kalman filter (Kalman filter corresponding to a non-linear formula).
  • Kalman filter corresponding to a non-linear formula
  • the system characteristics of the power system 4 can be estimated more appropriately and the voltage fluctuation of the interconnection point LP can be suppressed. can do.
  • the voltage value Vs of the interconnection point LP can be expressed by the non-linear equation of the following equation (2).
  • each estimated value ⁇ R, ⁇ X, ⁇ Vr is calculated.
  • the equation of state of the extended Kalman filter can be expressed by the following equation (3).
  • the output equation of the extended Kalman filter can be expressed by the following equation (4).
  • x is composed of the resistance component R of the system impedance of the power system 4, the reactance component X, and the voltage value Vr of the infinite bus power system 3 as expressed in the following equation (5). It is a state vector.
  • "T" represents transposition.
  • Equation (3) f is a non-linear function of the state vector x.
  • w is a vector of system noise.
  • the subscript "k” represents the time. In other words, the subscript "k” is the order of data corresponding to the periodically acquired active power value P, active power value Q, and voltage value Vs. “K-1” represents the data immediately before “k”. Therefore, Eq. (3) represents estimating the current state vector x from the previous state vector x.
  • the subscript "k” is the same in each of the following equations.
  • Equation (4) z is an observed value of the voltage value Vs.
  • h is a non-linear function of x.
  • v is the observed noise.
  • Equation (4) represents the reaction of the observed value z to the state vector x.
  • the observed value z is a measured value of the voltage value Vs by the measuring device 22.
  • the extended Kalman filter has a prediction step and an update step.
  • the estimated value calculation unit 50 predicts the state vector x by the following equation (6).
  • x f represents a predicted value of the state vector x.
  • x a represents the state vector x updated in the update step. As described above, in this example, the updated state vector x a is used as the predicted state vector x f .
  • the estimated value calculation unit 50 calculates each component of the predicted state vector x f as the estimated values ⁇ R, ⁇ X, and ⁇ Vr, respectively. That is, each estimated value ⁇ R, ⁇ X, ⁇ Vr is, in other words, each component of the updated state vector x a . Further, the estimated value calculation unit 50 has an initial value of the state vector x, and uses this initial value as the predicted state vector x f in the initial state in which the update step is not performed.
  • the control unit 42 controls the operation of the main circuit unit 40 as described above based on the estimated values ⁇ R, ⁇ X, and ⁇ Vr calculated in this way.
  • the initial value of the state vector x may be a constant value.
  • the average value of each estimated value ⁇ R, ⁇ X, ⁇ Vr for one day is used. You may calculate and use the average value of each estimated value ⁇ R, ⁇ X, ⁇ Vr as the initial value of the state vector x of the next day.
  • the estimated value calculation unit 50 calculates the average value of each estimated value ⁇ R, ⁇ X, ⁇ Vr in each predetermined period, and sets the average value of the calculated estimated values ⁇ R, ⁇ X, ⁇ Vr as the next predetermined value. It may have a function of setting the initial value of the state vector x in the period.
  • the estimated value calculation unit 50 predicts the state vector x and predicts the covariance matrix P f by the following equation (7).
  • the covariance matrix P f is an error covariance matrix of the predicted state vector x f in consideration of the influence of the system noise w.
  • J f (x) is a matrix defined by the Jacobian of the nonlinear function f. In this example, as shown in Eq. (8) below, the diagonal of (1,1,1) It is a matrix.
  • P k-1 is the previous covariance matrix or the initial value of the covariance matrix.
  • J f (x) T is the transposed matrix of the Jacobian matrix J f (x).
  • Q k-1 is a covariance matrix of the system noise w.
  • the covariance matrix Q k-1 of the system noise w is the expected value of the inner product of the system noise w and its transposed matrix as expressed by the following equation (9).
  • the control unit 42 operates the main circuit unit 40 based on the estimated values ⁇ R, ⁇ X, and ⁇ Vr calculated in the prediction step, and the active power value P when the main circuit unit 40 is operated is invalid.
  • the power value Q and the voltage value Vs are acquired.
  • the estimated value calculation unit 50 executes the update step after the active power value P, the active power value Q, and the voltage value Vs are acquired.
  • the estimated value calculation unit 50 updates the state vector x based on the acquired active power value P, active power value Q, and voltage value Vs.
  • the estimated value calculation unit 50 first updates the state vector x based on the acquired measured values of the active power value P, the ineffective power value Q, and the voltage value Vs and the covariance matrix P f. Optimize the Kalman gain for this.
  • the Kalman gain is obtained by the following equation (10).
  • J h (x) is a matrix defined by the Jacobian of the nonlinear function h.
  • J h (x) is expressed by the following equation (11).
  • ⁇ Vs / ⁇ R, ⁇ Vs / ⁇ X, and ⁇ Vs / ⁇ Vr are the following equations (12), (13), and (14) from the above equation (2), respectively. It is expressed as. However, in the equations (12), (13) and (14), B is the following equation (15), and C is the following equation (16). Further, in the above equation (10), J h (x) T is a transposed matrix of the Jacobian matrix J h (x). In equation (10), R k is a covariance matrix of the observed noise v. The covariance matrix R k of the observed noise v is the expected value of the inner product of the observed noise v and its transposed matrix, as shown in the following equation (17). In equation (10), the part [J h (x) P f J h (x) T + R k ] -1 is, in other words, the error covariance with respect to the prediction error (z-h (x f )). ..
  • the estimated value calculation unit 50 uses this Kalman gain to update the state vector x according to the following equation (18).
  • h (x f ) is a predicted value of the voltage value Vs calculated from the predicted state vector x f using the equation (2). That is, the estimated value calculation unit 50, the measured values z of the voltage value Vs of the interconnection point LP, the predicted value h of the voltage Vs of the linking point LP computed using the state vector x f after prediction (x f ) And, the prediction error of the voltage value Vs of the interconnection point LP is obtained.
  • the estimated value calculation unit 50 obtains a prediction error by subtracting the predicted value h (x f ) from the measured value z.
  • the estimated value calculation unit 50 calculates the correction value of the state vector x by multiplying this prediction error by the Kalman gain, and adds the correction value to the predicted state vector x f to update the updated state vector x. Find a. As a result, the next state vector x can be predicted in consideration of the prediction error.
  • the estimated value calculation unit 50 determines whether or not the absolute value of the prediction error (zh (x f )) is equal to or greater than a predetermined value.
  • the estimated value calculation unit 50 resets the previous covariance matrix P k-1 to the initial value.
  • the initial value of the covariance matrix is, for example, a covariance matrix having a relatively large value such as diag (200, 200, 200). As a result, the convergence of the covariance matrix P k-1 can be accelerated when the system characteristics change.
  • the estimated value calculation unit 50 updates the state vector x, and also updates the covariance matrix P by the following equation (19). As expressed in equation (19), the estimated value calculation unit 50 updates the covariance matrix P based on the optimized Kalman gain.
  • the estimated value calculation unit 50 repeatedly executes the above-mentioned prediction step and update step. As a result, each estimated value ⁇ R, ⁇ X, ⁇ Vr can be predicted by the extended Kalman filter, and the operation of the main circuit unit 40 can be controlled based on the prediction. As a result, fluctuations in the voltage value Vs of the interconnection point LP can be suppressed.
  • I is an identity matrix.
  • FIGS. 3 (a) to 3 (d) are graphs schematically showing an example of simulation results of the distributed power supply system according to the embodiment.
  • the vertical axis of FIG. 3A is the active power value P in the simulation.
  • the vertical axis of FIG. 3B is the invalid power value Q in the simulation.
  • the vertical axis of FIG. 3C is the voltage value Vs of the interconnection point LP in the simulation.
  • the vertical axis of FIG. 3D shows the voltage value Vr of the infinite bus power system 3 in the simulation and the estimated value Vr of the voltage value Vr of the infinity bus power system 3 obtained by the system characteristics estimated by the extended Kalman filter. It is Vr.
  • the horizontal axis of FIGS. 3 (a) to 3 (d) is time. Further, in FIGS. 3 (a) to 3 (d), the vertical axis represents an amount per unit having a rating of “1 pu”.
  • 3 (a) to 3 (d) schematically show an example of the simulation result when there is no other load (customer 16) or distributed power source (generator 18) in the immediate vicinity of the interconnection point LP. ing.
  • the reactive power value Q is controlled by the leading power factor.
  • the system characteristics ( ⁇ R, ⁇ X, ⁇ Vr) can be estimated well, so that the voltage value Vs of the interconnection point LP is ⁇ Vr. It can be seen that the voltage rise due to the transmitted power P is suppressed. By supplying an appropriate reactive power, the voltage value Vs of the interconnection point LP becomes 1p., Similar to the estimated value ⁇ Vr. u. Is practically constant.
  • the system characteristics of the power system 4 are appropriately estimated by using the extended Kalman filter, and the fluctuation of the voltage value Vs of the interconnection point LP is appropriately suppressed. be able to.
  • FIGS. 4 (a) to 4 (d) are graphs schematically showing another example of the simulation result of the distributed power supply system according to the embodiment.
  • the relationship between the vertical axis and the horizontal axis of FIGS. 4 (a) to 4 (d) is the same as the relationship between the vertical axis and the horizontal axis of FIGS. 3 (a) to 3 (d).
  • the generator 18 is 1p. In the immediate vicinity of the interconnection point LP. u. It is a simulation result when the output of is performed. As shown in FIG. 4 (b), the generator 18 has 1 p. u. When the output is performed, the reactive power value Q is controlled by the delay power factor.
  • each estimated value can be appropriately estimated by the extended Kalman filter.
  • the extended Kalman filter is used even when there is another load (customer 16) or a distributed power supply (generator 18) in the immediate vicinity of the interconnection point LP. Therefore, the system characteristics of the power system 4 can be appropriately estimated, and fluctuations in the voltage value Vs of the interconnection point LP can be appropriately suppressed.
  • 5 (a) to 5 (c), 6 (a) to 6 (c), 7 (a) and 7 (b) are examples of the operation of the distributed power supply system according to the embodiment. It is a graph which shows typically. 5 (a) to 5 (c) show a case where the operation of the main circuit unit 40 is controlled by constant power factor control and a case where the operation of the main circuit unit 40 is controlled based on an estimation using an extended Kalman filter. , Is schematically shown as an example of comparison.
  • FIG. 5A shows an extended Kalman filter based on the active power value P obtained by MPPT control, the active power value Q obtained by constant power factor control with respect to the active power value P, and the active power value P.
  • the reactive power command value Q op obtained by estimation using the above is schematically shown.
  • FIG. 5B schematically shows an example of the voltage value Vs of the interconnection point LP when the constant power factor control is performed and the voltage value Vsh of the interconnection point LP obtained by estimation using the extended Kalman filter. Represents.
  • FIG. 5C schematically shows an example of the power factor Pf when the constant force factor control is performed and the power factor Pf op when the estimation is performed using the extended Kalman filter.
  • FIG. 6A schematically shows an example of the prediction error err when the estimation is performed using the extended Kalman filter.
  • FIG. 6B shows an example of an estimated value of the resistance component R of the system impedance of the power system 4 and an estimated value of the reactance component X of the system impedance of the power system 4 when the estimation is performed using the extended Kalman filter. It is represented schematically.
  • FIG. 6C shows the voltage value Vs of the interconnection point LP when the constant power factor control is performed and the estimated value Vr of the voltage value Vr of the infinite bus power system 3 when the estimation is performed using the extended Kalman filter.
  • Each example is schematically shown.
  • FIG. 7A schematically shows an example of the active power Ppf1 when the constant power factor control is performed and the active power Ppf2 when the estimation is performed using the extended Kalman filter.
  • FIG. 7B schematically shows an example of the reactive power Qpf1 when the constant power factor control is performed and the reactive power Qpf2 when the estimation is performed using the extended Kalman filter.
  • the reactive power can be reduced and the power factor can be improved as compared with the case where the constant power factor control is performed. .. Therefore, active power can be efficiently supplied from the distributed power source 6 to the power system 4.
  • the owner of the distributed power source 6 can increase the profit on sale of electric power.
  • the fluctuation of the voltage Vs of the interconnection point LP is suppressed more appropriately by injecting an appropriate invalid power into the interconnection point LP.
  • the power factor of the output AC power can be improved, and the active power can be supplied to the power system 4 more efficiently.
  • the embodiments of the present invention have been described above with reference to specific examples. However, the embodiments of the present invention are not limited to these specific examples.
  • the present invention can be similarly carried out by appropriately selecting from a range known to those skilled in the art, and the same effect can be obtained. As far as possible, it is included in the scope of the present invention. Further, a combination of any two or more elements of each specific example to the extent technically possible is also included in the scope of the present invention as long as the gist of the present invention is included.

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  • Inverter Devices (AREA)

Abstract

L'invention concerne un dispositif de conversion de courant qui convertit le courant provenant d'une alimentation électrique distribuée en courant alternatif qui correspond à un système d'alimentation connecté à un système d'alimentation à barre omnibus infinie, et fournit le courant alternatif converti au système d'alimentation, ce qui permet d'interconnecter l'alimentation électrique distribuée au système électrique, le dispositif de conversion de courant comprenant une unité de circuit principal qui convertit le courant provenant de l'alimentation électrique distribuée en courant alternatif qui correspond au système d'alimentation, et une unité de commande qui commande les opérations de l'unité de circuit principal, et l'unité de commande ayant : une unité de calcul de valeur d'estimation qui calcule une valeur d'estimation d'une composante de résistance de l'impédance de système du système d'alimentation, une valeur d'estimation d'une composante de réactance de l'impédance du système, et une valeur d'estimation d'une valeur de tension du système d'alimentation à barre omnibus infinie, le calcul étant effectué sur la base d'une valeur de courant efficace d'un point d'interconnexion du système d'alimentation, d'une valeur de courant inefficace du point d'interconnexion, et d'une valeur de tension du point d'interconnexion à l'aide d'un filtre de Kalman qui correspond à un format sans fil ; une unité de calcul de courant inefficace qui calcule une valeur de commande de courant inefficace d'un courant inefficace fourni au système d'alimentation, le calcul étant effectué sur la base de la valeur d'estimation de la composante de résistance de l'impédance du système, de la valeur d'estimation de la composante de réactance de l'impédance du système, et de la valeur d'estimation de la valeur de tension du système d'alimentation à barre omnibus infinie ; et un circuit de commande qui commande l'unité de circuit principal de façon à produire un courant efficace prescrit et un courant inefficace qui correspond à la valeur de commande de courant inefficace. L'invention concerne ainsi un dispositif de conversion de courant et un système d'alimentation électrique distribuée dans lesquels il est possible de supprimer de manière plus appropriée la fluctuation de tension au niveau d'un point d'interconnexion d'une alimentation électrique distribuée.
PCT/JP2019/028885 2019-07-23 2019-07-23 Dispositif de conversion de courant et système d'alimentation électrique distribuée WO2021014578A1 (fr)

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JP2020503341A JP7058056B2 (ja) 2019-07-23 2019-07-23 電力変換装置及び分散型電源システム

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014199502A1 (fr) * 2013-06-14 2014-12-18 株式会社 日立製作所 Dispositif de réseau électrique, système et procédé
JP2017034739A (ja) * 2015-07-28 2017-02-09 株式会社ダイヘン 系統インピーダンス推定装置、インバータ装置、および、系統インピーダンス推定方法
JP2017063525A (ja) * 2015-09-24 2017-03-30 東芝三菱電機産業システム株式会社 分散型電源システムの制御装置および制御方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4689756B1 (ja) * 2010-03-31 2011-05-25 古河電気工業株式会社 電池内部状態推定装置および電池内部状態推定方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014199502A1 (fr) * 2013-06-14 2014-12-18 株式会社 日立製作所 Dispositif de réseau électrique, système et procédé
JP2017034739A (ja) * 2015-07-28 2017-02-09 株式会社ダイヘン 系統インピーダンス推定装置、インバータ装置、および、系統インピーダンス推定方法
JP2017063525A (ja) * 2015-09-24 2017-03-30 東芝三菱電機産業システム株式会社 分散型電源システムの制御装置および制御方法

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