WO2020003619A1 - Systeme de conversion de puissance - Google Patents

Systeme de conversion de puissance Download PDF

Info

Publication number
WO2020003619A1
WO2020003619A1 PCT/JP2019/009156 JP2019009156W WO2020003619A1 WO 2020003619 A1 WO2020003619 A1 WO 2020003619A1 JP 2019009156 W JP2019009156 W JP 2019009156W WO 2020003619 A1 WO2020003619 A1 WO 2020003619A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
power conversion
reactive power
command signal
reactive
Prior art date
Application number
PCT/JP2019/009156
Other languages
English (en)
Japanese (ja)
Inventor
智道 伊藤
輝 菊池
一瀬　雅哉
Original Assignee
株式会社日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Publication of WO2020003619A1 publication Critical patent/WO2020003619A1/fr

Links

Images

Classifications

    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • 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

  • the present invention relates to a power conversion system.
  • the power system is mainly composed of a generator for converting various energy sources into electric power, a power transmission and distribution network for transmitting the electric power to a demand place, and a load for consuming electric power.
  • Generators include hydroelectric generators that convert the kinetic energy of flowing water into electrical energy, and thermal power generators that generate steam using the thermal energy obtained from the combustion of fossil fuels and rotate the turbine with the expansion force to generate electric power. There is.
  • the generator when large power is transmitted through a power transmission and distribution network having a long power transmission path, the generator is likely to fluctuate after a disturbance such as a lightning strike, and in some cases, the generator may be in an unstable state, that is, a fluctuating state. There is. To stabilize the generator, it is effective to increase the number of transmission lines, including the number of lines. However, there are problems in that the cost is high and the lead time is long.
  • Patent Document 1 discloses a reactive power compensator that receives a voltage of a power system and an active power flowing through a transmission line and outputs a reactive power for stabilizing the power system.
  • the device of Patent Document 1 detects a voltage of a power system and calculates a reactive power for reducing a deviation from a predetermined value, and a predetermined frequency of a pulsation (oscillation component) of active power flowing out of the power system.
  • a computing unit that extracts a component and calculates a reactive power command signal proportional to the vibration component of the active power.
  • the voltage of the power system is detected to calculate the compensation reactive power. Therefore, if the reactive power compensator is installed in the immediate vicinity of the generator, the reactive power compensator may interfere with the AVR that detects the output voltage of the generator and controls the field current. Control interference causes control instability and a reduction in compensation effect due to inappropriate reactive power output. Even when the reactive power assurance device is arranged away from the generator, if the SVC that controls the voltage of the power system to a predetermined voltage is connected to the same system, control interference may similarly occur. .
  • An object of the present invention is to provide a power conversion system capable of quickly converging a generator sway without causing control interference or the like.
  • a power conversion system is a power conversion system connected to a three-phase power system, and extracts a fluctuation component of a first reactive power output from a generator connected to the power system, A control unit that outputs a command signal corresponding to the fluctuation component; and a power conversion unit that generates, based on the command signal, a second reactive power that cancels a fluctuation component of the first reactive power and outputs the generated second reactive power to the power system. It is characterized by having.
  • FIG. 1 is a system configuration diagram illustrating a power conversion device 1 of a power conversion system according to a first embodiment, together with a power generation system 3 and a power system 5.
  • FIG. 3 is a detailed block diagram of a waveform controller 2000 according to the first embodiment.
  • 5 is a graph illustrating the effect of the first embodiment. A modification of the first embodiment is shown.
  • FIG. 7 is a system configuration diagram illustrating a power conversion device 1a of a power conversion system according to a second embodiment, together with a power generation system 3 and a power system 5.
  • FIG. 14 is a detailed block diagram of a waveform controller 2000a according to the second embodiment.
  • FIG. 11 is a system configuration diagram illustrating a power conversion device 1b of a power conversion system according to a third embodiment, together with a power generation system 3 and a power system 5.
  • FIG. 1 is a system configuration diagram illustrating a power conversion device 1 according to a power conversion system according to a first embodiment, together with a power generation system 3 and a power system 5 (hereinafter, referred to as “system 5”).
  • system 5 a power system 5 that is a three-phase AC system
  • the power converter 1 detects a fluctuation component of the reactive power output from the power generation system 3 and outputs the reactive power to cancel the fluctuation component toward the system 5 as described later, thereby stabilizing the system 5. It is to perform the conversion.
  • the power generation system 3 includes a power generator 301.
  • the generator 301 is a rotary generator that obtains an output voltage by converting the rotational energy of the turbine 302 into electric energy by obtaining drive torque from the turbine 302 and being excited by the excitation device 303.
  • a stator winding (not shown) which is an output terminal of the generator 301 is electrically connected to the system 5 via a step-up transformer 304.
  • the power generation system 3 includes a governor controller (not shown) and a turbine driving force adjustment mechanism (not shown), and is configured to be able to adjust the turbine driving force adjustment force so as to match the power generation command.
  • the output voltage of the generator 301 is detected by the voltage sensor 305.
  • the detection value VG of the voltage sensor 305 is input to the exciter calculator 306.
  • the exciter calculator 306 calculates the output current command signal Di to be input to the exciter 303 so that the detected value VG matches a predetermined value near the rated voltage.
  • the excitation device 303 controls the output current Ifm so as to match the given output current command signal Di.
  • the power conversion device 1 is generally configured by the controller 100, the interconnection transformer 200, and the power conversion unit 500.
  • the controller 100 is a part that controls the power conversion unit 500. More specifically, the controller 100 detects the fluctuation component of the reactive power of the output voltage of the power generation system 3 and generates the reactive power from the power conversion unit 500 so as to cancel the fluctuation component. Execute the control.
  • the power converter 500 is a self-excited power converter composed of an IGBT, and includes a harmonic filter 500FL for cutting off harmonic components, an IGBT assembly 500ASM, and a DC capacitor 500C.
  • One end of the harmonic filter 500FL is connected to an AC output terminal of the IGBT assembly 500ASM, and the other end of the harmonic filter 500FL is connected to the interconnection transformer 200.
  • the AC circuit of the power conversion unit 500 is electrically connected to the system 5 via the interconnection transformer 200.
  • the DC terminal of IGBT assembly 500ASM is connected to DC capacitor 500C for smoothing DC voltage.
  • the voltage output from power converter 500 to system 5 is detected by voltage sensor 12 provided between harmonic filter 500FL and interconnection transformer 200, and the detected value Vac is output to controller 100 described above. . Further, the current output from power conversion section 500 to system 5 is detected by current sensor 13 provided between harmonic filter 500FL and interconnection transformer 200. The detection value Iac of the current sensor 13 is output to the controller 100. The voltage across DC capacitor 500C in power converter 500 is detected by voltage sensor 500S. The detected value Vdc is output to the controller 100 similarly to the detected values Vac and Iac.
  • the power conversion device 1 also includes a current sensor 10 and a voltage sensor 11.
  • the current sensor 10 is connected to a connection point where the power conversion device 1 connects to the system 5, and is configured to be able to detect an output current of the power generation system 3.
  • the voltage sensor 11 is connected to a connection point where the power conversion device 1 connects to the system 5, and is configured to be able to detect the output voltage of the power generation system 3.
  • the detection value IF of the current sensor 10 and the voltage detection value VF of the voltage sensor 11 are output to the controller 100.
  • the controller 100 includes a reactive power calculator 1001, a bandpass filter 1002, a multiplier 1003, a limiter 1004, and a waveform controller 2000, as shown in FIG.
  • the reactive power calculator 1001 calculates the reactive power output from the power generation system 3 to the system 5 based on the detected voltage value VF and the detected current value IF.
  • the output signal of the reactive power calculator 1001 is input to the band pass filter 1002.
  • the band pass filter 1002 is a filter that performs a band pass filter operation for extracting a fluctuation frequency component of the reactive power output from the generator 301. Since the power generation system 3 has the inertia of the generator 301 and the inertia of the turbine 302, the oscillation frequency is about 0.5 to 2 Hz.
  • the band-pass filter 1002 can extract the oscillating frequency component by having the characteristic of passing such a frequency component.
  • the output signal of the bandpass filter 1002 is input to the multiplier 1003.
  • Multiplier 1003 multiplies the output signal of bandpass filter 1002 by a constant ⁇ K (0 ⁇ K ⁇ 1), and outputs the product to limiter 1004.
  • the constant -K is a value that can be set by a parameter
  • the power conversion device 1 may include an interface that changes the constant K.
  • the interface may be a liquid crystal display provided in the power converter 1 or a terminal connection terminal for connecting a parameter setting terminal.
  • Limiter 1004 limits the output signal of multiplier 1003 to a predetermined upper limit or less, and outputs the signal after the limitation to waveform controller 2000 as reactive power command signal Q_ref. By setting the upper limit of the reactive power command signal Q_ref by the limiter 1004, it is possible to prevent the power converter 500 from outputting a command that is equal to or greater than the rated value.
  • the detected values Vac, Iac, Vdc of the voltage and current and the reactive power command signal Q_ref are input to the waveform controller 2000.
  • the waveform controller 2000 controls the voltage command signal Vc_ref based on the detected values Vac, Iac, Vdc, and the reactive power command signal Q_ref. Specifically, the waveform controller 2000 determines that the reactive power output from the power converter 1 (power converter 500) to the system 5 matches the reactive power command signal Q_ref, and that the voltage Vdc across the DC capacitor 500C is a fixed value. The voltage command signal Vc_ref is controlled so as to match the DC voltage command signal Vdcref.
  • FIG. 2 shows a detailed block diagram of the waveform controller 2000 according to the first embodiment.
  • the waveform controller 2000 includes, for example, a phase calculator 2001, a reactive power calculator 2002, an ⁇ - ⁇ converter 2003, a subtractor 2004, a reactive power controller (AQR) 2005, a subtractor 2006, a dq converter 2007, It comprises a subtractor 2008, a DC voltage controller (DC-AVR) 2009, a subtractor 2010, current controllers (ACR) 2011 and 2012, an inverse dq converter 2013, and a two-phase three-phase converter 2014.
  • DC-AVR DC voltage controller
  • ACR current controllers
  • the phase calculator 2001 receives the detection value Vac and calculates reference sine waves COS0 and SIN0 having an amplitude of 1 synchronized with the detection value Vac.
  • the phase calculator 2001 can be configured by a PLL (Phase @ Locked @ Loop) or a zero-crossing detection circuit, and can employ a circuit capable of calculating a phase or a digital operation in a controller.
  • the detected value Vac and the detected value Iac are input to the reactive power calculator 2002.
  • the reactive power calculator 2002 calculates the reactive power output from the power converter 500 of the power converter 1 to the system 5 based on the detected values Vac and Iac.
  • the output of the reactive power calculator 2002 and the reactive power command signal Q_ref are input to the subtractor 2004.
  • the subtractor 2004 calculates the difference between the reactive power command signal Q_ref based on the reactive power output from the power generation system 3 and the output of the reactive power calculator 2002 output from the power converter 500 (generates a deviation signal). And outputs the deviation signal to the reactive power controller 2005.
  • the reactive power controller 2005 is a PI controller, and calculates a reactive current command signal Iqref corresponding to the reactive power to be output to the system 5 by the power converter 1 so that the input deviation signal becomes zero.
  • the detection value Iac of the current sensor 13 is also input to the ⁇ - ⁇ converter 2003.
  • the ⁇ - ⁇ converter 2003 converts the three-phase quantities (IacU, IacV, IacW) of the detected value Iac into two-phase quantities (I ⁇ , I ⁇ ) according to the following [Equation 1].
  • the dq converter 2007 converts the signal of the orthogonal coordinate system into the signal of the rotating coordinate system (effective current Id) according to the following [Equation 2] based on the output of the ⁇ - ⁇ converter 2003 and the reference sine waves COS0 and SIN0. , Reactive current Iq).
  • the ⁇ - ⁇ converter 2003 and the dq converter 2007 have a function of outputting the active current Id and the reactive current Iq output from the power conversion unit 500 to the system 5 as signals of the rotating coordinate system. Have.
  • the reactive current command signal Iqref and the reactive current Iq are input to the subtractor 2006.
  • the subtractor 2006 calculates a difference between the reactive current command signal Iqref and the reactive current Iq as a feedback value from the power conversion unit 500, and outputs the difference to the current controller 2011.
  • the DC voltage detection value Vdc and the DC voltage command signal Vdcref that is a fixed value are input to the subtractor 2008.
  • the subtracter 2008 calculates the difference (deviation signal) between the DC voltage detection value Vdc and the DC voltage command signal Vdcref, and inputs the difference to the DC voltage controller (DC-AVR) 2009.
  • the DC voltage controller 2009 is a PI controller and calculates an effective current command signal Idref that reduces the deviation signal calculated by the subtractor 2008.
  • the active current command signal Idref and the active current Id calculated by the dq converter 2007 are output to the subtractor 2010.
  • the subtractor 2010 calculates a deviation between the effective current command signal Idref and the effective current Id as a feedback value from the power conversion unit 500, and outputs the result to the current controller (ACR) 2012.
  • Current controllers (ACR) 2011 and 2012 are both PI controllers, and calculate voltage command signals Vd and Vq for reducing the input deviation.
  • Output signals of the current controllers 2011 and 2012 are input to the inverse dq converter 2013.
  • the inverse dq converter 2013 converts the voltage command signals Vd and Vq on the rotating coordinates calculated by the current controllers 2011 and 2012 into fixed coordinates (V ⁇ , V ⁇ ).
  • the inverse dq converter 2013 is configured to be able to execute a matrix operation represented by the following [Equation 3].
  • the output signal of the inverse dq converter 2013 is output to the two-phase three-phase converter 2014.
  • the two-phase / three-phase converter 2014 converts the two-phase quantities (V ⁇ , V ⁇ ) into three-phase quantities (VU, VV, VW) and calculates a three-phase voltage command signal Vc_ref.
  • the specific operation of the two-phase to three-phase converter is represented by the following [Equation 4], where VU, VV, and VW indicate the three-phase values of the voltage command signal Vc_ref.
  • the voltage command signal Vc_ref is converted into a gate signal of the IGBT assembly 500ASM in the power converter 500 by a PWM converter (not shown).
  • the IGBT assembly 500ASM is a semiconductor power conversion circuit including a semiconductor element such as an IGBT or a diode, and has a function of outputting an AC voltage having an amplitude and a phase corresponding to the voltage command signal Vc_ref.
  • the power conversion device 1 ensures that the voltage Vdc across the DC capacitor 500C matches the DC voltage command signal Vdcref, and that the reactive power that the power conversion device 1 outputs to the system 5 is the reactive power command signal
  • the voltage command signal is controlled so as to match Q_ref.
  • the power conversion device 1 detects the output voltage of the power generation system 3 using the voltage sensor 11 and detects the output current of the power generation system 3 using the current sensor 10.
  • the detected voltage value VF of the voltage sensor 11 and the detected value IF of the current sensor 10 are output to the controller 100 of the power conversion device 1.
  • the detected voltage value VF and the detected current value IF are input to a reactive power calculator 1001 in the controller 100, and the reactive power calculator 1001 calculates the reactive power output from the power generation system 3 to the grid 5.
  • the reactive power calculated by the reactive power calculator 1001 is output to the bandpass filter 1002.
  • the bandpass filter 1002 executes a bandpass filter operation for extracting a fluctuation frequency component of the reactive power output from the generator 301. Since the power generation system 3 has the inertia of the generator 301 and the inertia of the turbine 302, the oscillation frequency is about 0.5 to 2 Hz.
  • the bandpass filter 1002 has a characteristic of passing the frequency component.
  • the output signal of the bandpass filter 1002 is output to the multiplier 1003.
  • Multiplier 1003 multiplies the output signal of bandpass filter 1002 by a constant ⁇ K (0 ⁇ K ⁇ 1), and outputs the product to limiter 1004.
  • the limiter 1004 limits the output of the multiplier 1003 to the upper limit of the reactive power that can be output by the power converter 500, and outputs the limited reactive power command signal Q_ref to the waveform controller 2000.
  • the power conversion device converts the reactive power that cancels the fluctuation of the reactive power that occurs when the output voltage of the power generation system 3 fluctuates due to a system disturbance such as a system accident. 1 can be output.
  • FIG. 3 shows, in order from the top, the voltage Vgrid at the interconnection point of the power converter 1, the reactive power Qgen output by the power generation system 3, the reactive power Qc output by the power converter 1, and the reactive power output to the grid 5.
  • the graph of FIG. 3 shows the total of the voltage Vgrid, the reactive power Qgen, the reactive power Qc, and the reactive power when a system fault occurs in the system 5 at time t1 and the cause of the fault is eliminated in a short time (for example, within 100 ms). It shows the time change of the value (Qgen + Qc).
  • the waveform shown by the solid line shows an example of the waveform when the above-described reactive power compensation operation is performed by the power conversion device 1 of the first embodiment.
  • a broken line shows an example of a waveform when the reactive power compensation operation by the power conversion device 1 is not performed.
  • the band-pass filter 1002 of the power conversion device 1 extracts the fluctuation frequency component of the reactive power Qgen output from the power generation system 3 and performs the fluctuation.
  • a reactive power Qc similar to the frequency and having the opposite polarity is output.
  • the system 5 outputs the sum (synthesis) Qgen + Qc of the two.
  • the power converter 1 according to the first embodiment can contribute to speeding up the fluctuation convergence of the rotary generators connected to the same system. Further, the power conversion device 1 according to the first embodiment does not include a feedback-type voltage control unit intended to detect the voltage of the system 5 and stabilize the voltage amplitude. Therefore, control interference with a voltage controller of the power generation system 3 or a voltage control system such as an SVC connected to the same system can be avoided.
  • the band-pass filter 1002 is used as a means for extracting the fluctuation component of the output of the power generation system 3.
  • the band-pass filter 1002 instead of the band-pass filter 1002, as shown in FIG. It is also possible to employ a band-pass filter 1002_2 with a phase compensation function including a compensator 1002_22 and a high-pass filter 1002_23.
  • the bandpass filter 1002 the difference between the lower limit value and the upper limit value of the pass frequency and the oscillation frequency of the power generation system 3 needs to be set sufficiently large in order to reduce the phase lag and lead in the pass frequency band.
  • the power conversion device 1 may perform unnecessary reactive power compensation and increase power loss.
  • the band-pass filter with phase compensation 1002_2 as shown in FIG. 4, it is possible to set the lower limit and the upper limit of the pass frequency to frequencies close to the generator oscillation frequency. Can reduce the power loss that occurs.
  • the voltage sensor 11 and the current sensor 10 that detect the system voltage are components of the power conversion device 1.
  • the voltage sensor 11 and the current sensor 10 are provided outside the power conversion device 1, and an interface for receiving the detection values VF and IF as an analog signal or a digital signal is provided between the sensors 10 and 11 and the power conversion device 1. You may.
  • FIG. 5 is a system configuration diagram illustrating the power conversion device 1a according to the power conversion system according to the second embodiment, together with the power generation system 3 and the system 5.
  • the second embodiment is different from the first embodiment in that the power converter 1a is a storage battery unit.
  • the power converter 1a is a storage battery unit.
  • the power converter 1a is configured as a storage battery unit to which the storage battery unit 500BAT is connected instead of the DC capacitor 500C (FIG. 1) in the power conversion unit 500a.
  • the storage battery unit 500BAT may include a storage battery and a controller (both not shown) for detecting the state of charge SOC of the storage battery.
  • the detected state of charge SOC can be transmitted to the host controller 50 as an example.
  • the host control device 50 may be configured to calculate the active power command Pref based on the information on the state of charge SOC so that the state of charge SOC falls within the storage battery operation range.
  • the power converter 1a according to the second embodiment further includes a frequency calculator 1005, a bandpass filter 1006, a multiplier 1007, an adder 1008, and a limiter 1009, in addition to the components of the first embodiment. Have.
  • the frequency calculator 1005 calculates a frequency component included in the voltage output by the power generation system 3 based on the detection value VF of the voltage sensor 11.
  • the bandpass filter 1006 has a function of extracting a frequency component related to a fluctuation component from the output of the frequency calculator 1005.
  • the multiplier 1007 multiplies the output signal of the band-pass filter 1007 by a constant ⁇ K2 (K2 is a positive value), and inputs the product signal p_damp to the adder 1008.
  • Adder 1008 calculates the sum of signal p_damp and the above-mentioned active power command signal Pref (generates an addition signal), and outputs the addition signal.
  • the limiter 1009 limits the addition signal to a predetermined upper limit or less, and outputs the signal after the limitation as the active power command signal P_ref2.
  • the waveform controller 2000a corresponds to the waveform controller 2000 of the first embodiment, and based on the active power command signal P_ref2, the detected values Vac and Iac, and the reactive power command signal Q_ref, the voltage command signal Vc_ref Control.
  • the waveform controller 2000a according to the second embodiment differs from the waveform controller 2000 according to the first embodiment in that an active power command signal P_ref2 is used as an input value instead of the detection value Idc. This difference is based on the fact that storage battery unit 500BAT is employed instead of DC capacitor 500C.
  • the waveform controller 2000a controls the voltage command signal Vc_ref so that the reactive power output from the power converter 1 to the system 5 matches the signal Q_ref and the signal P_ref2 matches the active power P.
  • the voltage detection value VF detected by the voltage sensor 11 is output to the frequency calculator 1005 in addition to the reactive power calculator 1001.
  • the reactive power calculators 1001 to 1004 operate in the same manner as in the first embodiment, and generate a reactive power command signal Q_ref.
  • the frequency calculator 1005 calculates the frequency of the output voltage of the power generation system 3 from the detected value VF, and outputs the frequency to the band-pass filter 1006.
  • the bandpass filter 1006 extracts the fluctuation frequency component of the output voltage of the power generation system 3 included in the output of the frequency calculator 1005.
  • the band pass filter 1006 may be the band pass filter with phase compensation shown in FIG.
  • the output signal of the band-pass filter 1006 is input to the multiplier 1007.
  • the multiplier 1007 multiplies the output signal of the band-pass filter 1006 by -K2 (K2 is a constant of a positive value), and adds the output P_damp to the adder 1008.
  • the adder 1008 adds P_damp and the active power command signal Pref received from the host controller 50, and outputs the sum signal to the limiter 1009.
  • the limiter 1009 limits the output signal of the adder 1008 to less than or equal to the restrictions of the storage battery in the storage battery unit 500BAT and the power conversion unit 500a, and outputs the limited signal to the waveform controller 2000a as the active power command signal P_ref2.
  • FIG. 6 shows a detailed block diagram of the waveform controller 2000a according to the second embodiment. 6, the same components as those in FIG. 2 are denoted by the same reference numerals in FIG. 6, and overlapping descriptions will be omitted.
  • the waveform controller 2000a according to the second embodiment includes an active / reactive power calculator 2002a instead of the reactive power calculator 2002.
  • the active / reactive power calculator 2002a calculates the reactive power Q output from the power conversion unit 500a of the power conversion device 1 to the system 5 based on the detected values Vac and Iac, and the power conversion unit 500a The output active power P is calculated.
  • the waveform controller 2000a according to the second embodiment includes a subtracter 2030 and an active power controller 2031 instead of the subtractor 2008 and the DC voltage controller (DC-AVR) 2009.
  • the subtractor 2030 performs a subtraction process between the active power command signal P_ref2 and the active power P calculated by the active / reactive power calculator 2002a, and outputs a subtraction signal.
  • the active power controller 2031 is a PI controller, and calculates an active current command signal Idref to make the subtraction signal (active power deviation) calculated by the subtractor 2030 zero.
  • Other configurations and operations are the same as those of the first embodiment (FIG. 2), and thus the duplicate description will be omitted.
  • the power converter 1a calculates a frequency deviation having a generator fluctuation frequency component of the transmission line 5 caused by system disturbance, and when the frequency rises, receives active power from the system 5 and charges the storage battery. However, when the frequency decreases, active power can be supplied to the grid 5 by discharging the storage battery.
  • the state where the frequency is high is a state where the rotation speed of the generator 301 is high.
  • the active power P is positively received by the power converter 1a from the system 5, so that the excessive rotational energy stored in the rotor of the generator 301 can be absorbed.
  • the state where the frequency is low is a state where the rotation speed of the generator 301 is low.
  • the power conversion device 1a positively outputs the active power P to the system 5, so that the rotational energy can be supplied to the rotor of the generator 301 having insufficient rotational energy. .
  • the power converter 1a according to the second embodiment does not include a feedback-type voltage control unit intended to stabilize the voltage amplitude by detecting the interconnection point voltage. Therefore, control interference with a voltage controller of the generator or a voltage control system such as SVC interconnected to the same system can be avoided. Further, by constructing the power conversion device 1a as a storage battery unit, it is possible to utilize both the active power and the reactive power, thereby contributing to further speeding up the fluctuation of the generator.
  • FIG. 7 is a system configuration diagram illustrating the power conversion device 1b according to the power conversion system according to the third embodiment, together with the power generation system 3 and the system 5.
  • the power conversion device 1a includes an interface unit (input unit) capable of externally inputting a command signal for instructing validity / invalidity of the reactive power compensation. Is different from the form.
  • the same components as those of the second embodiment (FIG. 5) are denoted by the same reference numerals, and redundant description is omitted below.
  • the power converter 1b receives a flag QFLG (selection signal) for selecting the validity / invalidity of the reactive power compensation from the host controller 50, and is driven by the flag QFLG to generate a reactive power command.
  • a switch calculator 1010 is provided which can select whether the signal Q_ref is a value calculated by a fluctuation component calculator of the reactive power calculators 1001 to 1004 or is maintained at zero. According to this configuration, when the fluctuation in the entire system 5 is confirmed, the reactive power compensation operation can be stopped, and the widening of the fluctuation can be avoided.
  • bandpass filter with phase compensation # 1002_21 ... low-pass filter, # 1002_22 ... phase compensator, # 1002_23 ... high-pass filter, # 1003, 1007 ... multiplier, # 1004, 1009 ... limiter, # 1005 ... frequency calculator, # 1008 ..Adder, $ 1010 switch calculator, $ 2000, 2000a waveform controller, $ 2001 phase calculator, $ 2002 reactive power calculator, $ 2003 alpha-beta converter 2004, 2006, 2008, 2010, 2030... Subtractor, # 2007 ... dq converter, # 2011, 2012 ... current controller, # 2013 ... inverse dq converter, # 2014 ... Two-phase to three-phase converter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Eletrric Generators (AREA)
  • Inverter Devices (AREA)

Abstract

La présente invention concerne un système de conversion de puissance qui peut faire converger des oscillations de générateur à un stade précoce, sans provoquer la génération de brouillage de commande ou similaire. Ce système de conversion de puissance est raccordé à un réseau électrique triphasé et est pourvu : d'une unité de commande qui extrait la composante d'oscillation d'une première puissance réactive qui est transmise par un générateur raccordé au réseau électrique, et qui émet un signal de commande correspondant à la composante d'oscillation ; et d'une unité de conversion de puissance qui, en fonction du signal de commande, génère une seconde puissance réactive qui annule la composante d'oscillation de la première puissance réactive, et transmet la seconde puissance réactive au réseau électrique.
PCT/JP2019/009156 2018-06-27 2019-03-07 Systeme de conversion de puissance WO2020003619A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018122425A JP7054653B2 (ja) 2018-06-27 2018-06-27 電力変換システム
JP2018-122425 2018-06-27

Publications (1)

Publication Number Publication Date
WO2020003619A1 true WO2020003619A1 (fr) 2020-01-02

Family

ID=68986823

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/009156 WO2020003619A1 (fr) 2018-06-27 2019-03-07 Systeme de conversion de puissance

Country Status (2)

Country Link
JP (1) JP7054653B2 (fr)
WO (1) WO2020003619A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7337764B2 (ja) * 2020-09-15 2023-09-04 東芝三菱電機産業システム株式会社 電力システム、制御装置、電力補償ユニット、および制御方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08263153A (ja) * 1995-03-23 1996-10-11 Meidensha Corp 電動機装置
JP2000253579A (ja) * 1999-02-25 2000-09-14 Shibafu Engineering Kk 直列補償装置
JP2010187482A (ja) * 2009-02-13 2010-08-26 Hitachi Ltd 風力発電装置および風力発電装置の制御方法
JP2012125019A (ja) * 2010-12-07 2012-06-28 Tohoku Electric Power Co Inc 電力系統安定化装置
JP2014042381A (ja) * 2012-08-21 2014-03-06 Daihen Corp インバータ回路を制御する制御回路、および、当該制御回路を備えたインバータ装置
JP2014042409A (ja) * 2012-08-23 2014-03-06 Daihen Corp 電力動揺成分出力抑制装置
JP2017147785A (ja) * 2016-02-15 2017-08-24 株式会社東芝 電力系統安定化装置、電力系統安定化方法および補助電源装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09252537A (ja) * 1996-03-18 1997-09-22 Hitachi Ltd 電力系統安定化装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08263153A (ja) * 1995-03-23 1996-10-11 Meidensha Corp 電動機装置
JP2000253579A (ja) * 1999-02-25 2000-09-14 Shibafu Engineering Kk 直列補償装置
JP2010187482A (ja) * 2009-02-13 2010-08-26 Hitachi Ltd 風力発電装置および風力発電装置の制御方法
JP2012125019A (ja) * 2010-12-07 2012-06-28 Tohoku Electric Power Co Inc 電力系統安定化装置
JP2014042381A (ja) * 2012-08-21 2014-03-06 Daihen Corp インバータ回路を制御する制御回路、および、当該制御回路を備えたインバータ装置
JP2014042409A (ja) * 2012-08-23 2014-03-06 Daihen Corp 電力動揺成分出力抑制装置
JP2017147785A (ja) * 2016-02-15 2017-08-24 株式会社東芝 電力系統安定化装置、電力系統安定化方法および補助電源装置

Also Published As

Publication number Publication date
JP7054653B2 (ja) 2022-04-14
JP2020005395A (ja) 2020-01-09

Similar Documents

Publication Publication Date Title
JP4575272B2 (ja) 分散型電源システム及び系統安定化方法
US9252601B2 (en) Method for controlling a power converter in a wind turbine generator
JP6796029B2 (ja) 新エネルギー源統合電力変換装置
JP4680102B2 (ja) 電力変換装置
EP2606548B1 (fr) Procédé de commande d'un convertisseur latéral de grille d'une turbine éolienne et système correspondant adapté
CN109698517B (zh) 一种控制电力***的方法和装置
JP5542609B2 (ja) 無効電力補償装置
EP2355317B1 (fr) Dispositif de contrôleur de courant et procédé de contrôle de vecteur pour contrôler la conversion d'alimentation
JP5226540B2 (ja) インバータ制御回路、このインバータ制御回路を備えた系統連系インバータシステム
US9548690B2 (en) System and method for adjusting current regulator gains applied within a power generation system
JP6022711B2 (ja) ガスタービン発電システム
JP6043543B2 (ja) インバータ回路を制御する制御回路、および、当該制御回路を備えたインバータ装置
US8693220B2 (en) System for improved wind turbine generator performance
JP2011193606A (ja) 太陽光発電システム
JP2012085482A (ja) 分散型電源システム
Zhou et al. Control of DFIG under unsymmetrical voltage dip
JP5830484B2 (ja) 無効電力比率制御器、無効電力比率制御方法、およびこれを用いた発電システム
JP2019003454A (ja) 交直変換器制御装置
JP2011015493A (ja) 分散型電源装置
CN112368934A (zh) 用于控制风能设备的发电机的方法
WO2020003619A1 (fr) Systeme de conversion de puissance
WO2017064820A1 (fr) Système de génération de puissance électrique et son système de commande
CN114051692A (zh) 用于使发电机振荡最小化的方法
Wu AC/DC power conversion interface for self-excited induction generator
KR101732028B1 (ko) 풍력 발전기 및 그의 계통연계점 불평형 전압 보상 제어 방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19826145

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19826145

Country of ref document: EP

Kind code of ref document: A1