WO2022269858A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
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- WO2022269858A1 WO2022269858A1 PCT/JP2021/023950 JP2021023950W WO2022269858A1 WO 2022269858 A1 WO2022269858 A1 WO 2022269858A1 JP 2021023950 W JP2021023950 W JP 2021023950W WO 2022269858 A1 WO2022269858 A1 WO 2022269858A1
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 18
- 230000001360 synchronised effect Effects 0.000 claims abstract description 83
- 238000012545 processing Methods 0.000 claims abstract description 20
- 238000004088 simulation Methods 0.000 claims abstract description 6
- 238000013016 damping Methods 0.000 claims description 18
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 abstract 1
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- 238000012986 modification Methods 0.000 description 4
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- 230000033228 biological regulation Effects 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Definitions
- the present disclosure relates to power converters.
- Patent Document 1 discloses a control device for distributed power sources.
- the control device calculates a virtual inertia value based on the specifications and operating conditions of the distributed power source, and provides a virtual Set inertia.
- Patent Literature 1 does not teach or suggest any technique for such needs.
- An object of one aspect of the present disclosure is to provide a power conversion device capable of improving the stability of a power system by simulating the characteristics of a plurality of synchronous generators.
- a power converter includes a power converter connected to a power storage element, and a control device that controls the power converter.
- the power converter converts the DC power output from the storage element into AC power and outputs the AC power to the power system.
- the control device includes a generator simulating unit that generates a voltage command value for the power converter by simulating the characteristics of a plurality of synchronous generators, and a power conversion unit based on the voltage command value generated by the generator simulating unit. and a signal generator for generating a control signal for the device.
- the generator simulating section simulates the characteristic of the first synchronous generator to generate a first command value, and the characteristic of the second synchronous generator different from the characteristic of the first synchronous generator.
- a second characteristic simulating unit that generates a second command value by simulating, an adder that performs addition processing of the first command value and the second command value, and addition of the first command value and the second command value and a voltage command generation unit that generates a voltage command value based on the processing result.
- FIG. 1 is a diagram showing the overall configuration of a power conversion system according to Embodiment 1; FIG. It is a figure which shows the hardware structural example of a control apparatus.
- 4 is a block diagram showing a specific functional configuration of a characteristic simulating section according to Embodiment 1;
- FIG. 10 is a diagram showing the overall configuration of a power conversion system according to Embodiment 2;
- FIG. 9 is a block diagram showing a specific functional configuration of a characteristic simulating section according to Embodiment 2; It is a figure for demonstrating the modification of a generator simulating part.
- FIG. 1 is a diagram showing the overall configuration of a power conversion system according to Embodiment 1.
- the power conversion system includes a power grid 2 , a transformer 3 , a power converter 6 , a current detector 7 , a voltage detector 8 and a storage element 60 .
- the power system 2 is, for example, a three-phase AC power supply.
- Power conversion device 6 includes a control device 100 and a power converter 20 .
- Power converter 20 is connected to interconnection point 4 of power system 2 via transformer 3 . Note that a configuration in which an interconnection reactor is connected to the power converter 20 instead of the transformer 3 may be employed.
- the power converter 20 is a power converter that is connected to the power storage element 60 and performs power conversion between the power storage element 60 and the power system 2 . Specifically, power converter 20 converts the DC power output from power storage element 60 into AC power, and outputs the AC power to power system 2 via transformer 3 . Further, power converter 20 converts AC power from power system 2 into DC power and outputs the DC power to power storage element 60 . Thereby, the power converter 20 charges and discharges the electric power of the storage element 60 .
- Power converter 20 is, for example, a self-commutated converter such as a two-level converter, a three-level converter, or a modular multi-level converter.
- the electricity storage element 60 is, for example, an energy storage element such as an electric double layer capacitor or a secondary battery.
- the current detector 7 detects a three-phase AC current at the interconnection point 4 of the power system 2 . Specifically, the current detector 7 detects an a-phase alternating current Ia, a b-phase alternating current Ib, and a c-phase alternating current Ic that flow between the connection point 4 and the power converter 20 .
- AC currents Ia, Ib, and Ic are input to control device 100 .
- the alternating currents Ia, Ib, and Ic are hereinafter collectively referred to as alternating current Isys.
- the voltage detector 8 detects the three-phase AC voltage at the interconnection point 4 of the power system 2 . Specifically, voltage detector 8 detects a-phase AC voltage Va, b-phase AC voltage Vb, and c-phase AC voltage Vc at interconnection point 4 .
- AC voltages Va, Vb, and Vc are input to control device 100 .
- the AC voltages Va, Vb, and Vc are hereinafter collectively referred to as the AC voltage Vsys.
- the control device 100 is a device that controls the operation of the power converter 20 .
- the control device 100 includes a generator simulating section 101 and a signal generating section 103 as main functional configurations.
- Each function of the generator simulating unit 101 and the signal generating unit 103 is implemented by a processing circuit.
- the processing circuit may be dedicated hardware, or may be a CPU that executes a program stored in the internal memory of the control device 100 . If the processing circuitry is dedicated hardware, the processing circuitry may be, for example, an FPGA, an ASIC, or a combination thereof.
- the generator simulating unit 101 generates a voltage command value for the power converter 20 by simulating the characteristics of a plurality of synchronous generators based on the AC voltage Vsys and the AC current Isys at the interconnection point 4 .
- generator simulating section 101 includes first characteristic simulating section 11 , second characteristic simulating section 12 , adder 13 , reactive power command generating section 14 , and voltage command generating section 15 .
- the first characteristic simulating section 11 By simulating the characteristics of the first synchronous generator, the first characteristic simulating section 11 outputs an active power command value P1x indicating the target value of the active power to be output in order to simulate the characteristics.
- the second characteristic simulating unit 12 simulates the characteristics of the second synchronous generator that are different from the characteristics of the first synchronous generator, thereby simulating the active power indicating the target value of the active power to be output to simulate the characteristics.
- a command value P2x is output. Specific configurations of the first characteristic simulating section 11 and the second characteristic simulating section 12 will be described later.
- the first characteristic simulating section 11 and the second characteristic simulating section 12 are also collectively referred to as "the characteristic simulating section 10".
- Active power command value Pref is a target value of active power to be output by power converter 20 in order to simulate both the characteristics of the first synchronous generator and the characteristics of the second synchronous generator.
- the reactive power command generation unit 14 Based on the detected value of the AC voltage Vsys, the reactive power command generation unit 14 performs automatic AC voltage adjustment to bring the detected value of the AC voltage Vsys closer to the rated value. Further, the reactive power command generation unit 14 performs automatic reactive power adjustment to bring the reactive power measurement value closer to the target value based on the reactive power measurement value calculated from each detected value of the AC voltage Vsys and the AC current Isys. do.
- the reactive power command generator 14 generates a reactive power command value Qref by executing automatic AC voltage regulation and automatic reactive power regulation.
- the voltage command generation unit 15 generates the voltage command value Vref based on the addition processing result of the adder 13 (that is, the active power command value Pref). Specifically, the voltage command generator 15 calculates the active current component and the reactive current component by subjecting the detected value of the three-phase alternating current Isys to variable conversion. Further, the voltage command generator 15 calculates the effective voltage component and the ineffective voltage component by subjecting the detected value of the three-phase AC voltage Vsys to variable conversion. Based on the active current component, the reactive current component, the active voltage component, and the reactive voltage component, the voltage command generation unit 15 outputs active power according to the active power command value Pref and outputs reactive power according to the reactive power command value Qref.
- a voltage command value Vref for each phase of power converter 20 is generated as follows.
- the signal generating unit 103 generates a control signal for the power converter 20 based on the voltage command value Vref generated by the generator simulating unit 101 and outputs the control signal to the power converter 20 .
- the signal generator 103 includes a three-phase voltage generator 17 and a PWM (Pulse Width Modulation) controller 19 .
- the three-phase voltage generator 17 generates three-phase sinusoidal voltages Va*, Vb*, Vc* based on the absolute value
- and the phase ⁇ ref of the voltage command value Vref. Specifically, Va*
- ⁇ sin( ⁇ ref), Vb*
- ⁇ sin( ⁇ ref+2 ⁇ /3), and Vc*
- the PWM control unit 19 performs pulse width modulation on each of the three-phase sinusoidal voltages Va*, Vb*, and Vc* to generate control signals as PWM signals.
- PWM control unit 19 outputs the control signal to power converter 20 .
- the control signal is a gate control signal for controlling on and off of each switching element included in power converter 20 .
- FIG. 2 is a diagram showing a hardware configuration example of the control device 100. As shown in FIG. FIG. 2 shows an example of configuring the control device 100 by a computer.
- control device 100 includes one or more input converters 70, one or more sample and hold (S/H) circuits 71, multiplexer (MUX) 72, A/D converter 73 , one or more CPU (Central Processing Unit) 74, RAM (Random Access Memory) 75, ROM (Read Only Memory) 76, one or more input/output interfaces 77, and auxiliary storage device 78 .
- Controller 100 also includes a bus 79 interconnecting components.
- the input converter 70 has an auxiliary transformer for each input channel.
- Each auxiliary transformer converts the signals detected by current detector 7 and voltage detector 8 of FIG. 1 to signals of voltage levels suitable for subsequent signal processing.
- a sample hold circuit 71 is provided for each input converter 70 .
- the sample hold circuit 71 samples and holds the signal representing the electric quantity received from the corresponding input converter 70 at a prescribed sampling frequency.
- a multiplexer 72 sequentially selects the signals held in the plurality of sample hold circuits 71 .
- A/D converter 73 converts the signal selected by multiplexer 72 into a digital value. By providing a plurality of A/D converters 73, A/D conversion may be performed in parallel on detection signals of a plurality of input channels.
- the CPU 74 controls the entire control device 100 and executes arithmetic processing according to a program.
- a RAM 75 as a volatile memory and a ROM 76 as a nonvolatile memory are used as main memory of the CPU 74 .
- the ROM 76 stores programs and set values for signal processing.
- the auxiliary storage device 78 is a non-volatile memory having a larger capacity than the ROM 76, and stores programs, data of detected electric quantity values, and the like.
- the input/output interface 77 is an interface circuit for communication between the CPU 74 and external devices.
- control device 100 can be configured using circuits such as FPGA (Field Programmable Gate Array) and ASIC (Application Specific Integrated Circuit).
- FPGA Field Programmable Gate Array
- ASIC Application Specific Integrated Circuit
- FIG. 3 is a block diagram showing a specific functional configuration of a characteristic simulating section according to the first embodiment.
- characteristic simulating unit 10 includes a divider 30, a subtractor 31, proportional units 32 and 34, integrators 33 and 36, adders 35 and 37, and a calculator 38. .
- the proportional device 32 multiplies the difference ⁇ T by "1/M".
- M is the moment of inertia (also referred to as the constant of inertia) of the rotor of the synchronous generator to be simulated by the characteristic simulating unit 10 (hereinafter also referred to as “virtual synchronous generator”).
- Active power command value Px corresponds to a target value of active power to be output from power converter 20 in order to simulate characteristics equivalent to those of a synchronous generator.
- the integrator 33 time-integrates the multiplied value (that is, ⁇ T/M) of the proportional device 32 and outputs the angular frequency deviation ⁇ .
- the angular frequency deviation ⁇ corresponds to the difference between the angular frequency ⁇ of the rotor of the virtual synchronous generator and the reference angular frequency ⁇ 0 of the electric power system 2 .
- the reference angular frequency ⁇ 0 is the angular frequency of the reference frequency (for example, 50 Hz or 60 Hz) of power in the power system 2 .
- the proportional device 34 multiplies the angular frequency deviation ⁇ by "D" to calculate the braking torque Td. "D” is the damping factor of the virtual synchronous generator.
- the adder 35 calculates the angular frequency ⁇ by adding the angular frequency deviation ⁇ and the reference angular frequency ⁇ 0.
- the integrator 36 time-integrates the angular frequency deviation ⁇ and outputs the phase deviation ⁇ m.
- the phase deviation ⁇ m corresponds to the difference between the phase of the AC voltage Vsys at the interconnection point 4 and the phase of the rotor of the virtual synchronous generator.
- the phase deviation ⁇ o corresponds to the difference between the phase of the AC voltage Vsys at the interconnection point 4 and the reference phase of the AC voltage output from the power converter 20 .
- the phase deviation ⁇ corresponds to the difference between the phase of the AC voltage Vsys at the interconnection point 4 and the phase of the AC voltage to be output from the power converter 20 .
- a calculator 38 calculates an active power command value Px based on the power supply voltage Vs of the power system 2 , the AC voltage Vsys of the interconnection point 4 , the phase deviation ⁇ , and the inductance Xg of the power converter 20 . It is assumed that the power supply voltage Vs is the rated voltage. Calculator 38 calculates active power command value Px by dividing a multiplied value (that is, Vs ⁇ Vsys ⁇ ) of power supply voltage Vs, AC voltage Vsys, and phase deviation ⁇ by inductance Xg.
- the first characteristic simulating section 11 and the second characteristic simulating section 12 simulate the corresponding synchronous generator based on the corresponding moment of inertia M and braking coefficient D. Specifically, first characteristic simulating section 11 generates active power command value P1x for simulating the characteristic of the first synchronous generator using moment of inertia M1 and damping coefficient D1. The second characteristic simulating section 12 uses the moment of inertia M2 and the damping coefficient D2 to generate an active power command value P2x for simulating the characteristic of the second synchronous generator.
- the characteristics of the first synchronous generator depend on the values of the moment of inertia M1 and the damping factor D1
- the characteristics of the second synchronous generator depend on the values of the moment of inertia M2 and the damping factor D2. Note that the moment of inertia M1 is different from the moment of inertia M2. Furthermore, the damping factor D1 may be different from the damping factor D2.
- Synchronous generators typically have large inertia and losses, so frequency components (e.g., grid impedance, synchronous generator moment of inertia and internal impedance It has the characteristic of suppressing the frequency component caused by Therefore, when a plurality of synchronous generators having different moments of inertia and internal impedances are interconnected to the electric power system, frequency components due to resonance between the electric power system and the respective synchronous generators are suppressed.
- Generator simulating section 101 according to the first embodiment simulates the characteristics of both the first synchronous generator and the second synchronous generator. As a result, frequency components due to resonance between each of the first synchronous generator and the second synchronous generator and the electric power system 2 are suppressed, so that the stability of the frequency band corresponding to each frequency component is improved.
- FIG. 4 is a diagram showing the overall configuration of a power conversion system according to Embodiment 2. As shown in FIG. The power conversion system of FIG. 4 replaces the control device 100 of the power conversion system of FIG. 1 with a control device 100A. 100 A of control apparatuses replace the generator simulating part 101 of the control apparatus 100 with the generator simulating part 101A. The configuration other than the generator simulating unit 101A is the same as the configuration in FIG. 1, so detailed description thereof will not be repeated.
- the generator simulating section 101A includes a first characteristic simulating section 11A, a second characteristic simulating section 12A, an adder 13A, and a voltage command generating section 15A.
- the first characteristic simulating section 11A By simulating the characteristics of the first synchronous generator, the first characteristic simulating section 11A outputs a phase command value ⁇ 1x indicating the target value of the phase of the voltage to be output in order to simulate the characteristics.
- the second characteristic simulating section 12 simulates the characteristic of the second synchronous generator and outputs a phase command value ⁇ 2x indicating the target value of the phase of the voltage to be output to simulate the characteristic.
- the first characteristic simulating section 11A and the second characteristic simulating section 12A are also collectively referred to as the "characteristic simulating section 10A.”
- the phase command value ⁇ ref is a target value for the phase of the voltage that power converter 20 should output in order to simulate both the characteristics of the first synchronous generator and the characteristics of the second synchronous generator.
- the voltage command generator 15A generates the voltage command value Vref for the power converter 20 based on the phase according to the addition processing result of the adder 13A (that is, the phase command value ⁇ ref). Specifically, the voltage command generator 15A converts the absolute value
- signal generating section 103 generates a control signal for power converter 20 based on absolute value
- FIG. 5 is a block diagram showing a specific functional configuration of a characteristic simulating section according to the second embodiment.
- characteristic simulating unit 10A includes subtractors 50 and 51 , proportional units 52 and 54 , integrators 53 and 56 and an adder 55 .
- the subtractor 50 calculates the difference ⁇ P between the active power command value Px and the active power P.
- the active power P is the current active power supplied to the interconnection point 4, and is calculated based on the alternating current Isys detected by the current detector 7 and the alternating voltage Vsys detected by the voltage detector 8. be.
- the active power command value Px is appropriately set by the system operator.
- the subtractor 51 subtracts the output value of the proportional device 54 from the difference ⁇ P.
- the output value of the proportional device 54 is the product "D*.DELTA..omega.” of the angular frequency deviation .DELTA..omega. and the damping coefficient D*.
- M* is the moment of inertia of the rotor of the synchronous generator to be simulated by the characteristic simulating unit 10A
- D* is the braking coefficient of the synchronous generator. Note that the moment of inertia M and the damping coefficient D in FIG. 3 are values used when calculating the angular frequency deviation ⁇ based on the torque, and the moment of inertia M* and the damping coefficient D* in FIG. It is a value used when calculating the angular frequency deviation ⁇ based on.
- the integrator 53 time-integrates the multiplied value (that is, ⁇ P/M*) of the proportional device 52 and outputs the angular frequency deviation ⁇ .
- the adder 55 calculates the angular frequency ⁇ by adding the angular frequency deviation ⁇ and the reference angular frequency ⁇ 0.
- the integrator 56 time-integrates the angular frequency ⁇ and outputs a phase command value ⁇ x.
- the first characteristic simulating section 11A and the second characteristic simulating section 12A simulate the corresponding synchronous generator based on the corresponding moment of inertia M* and braking coefficient D*. Specifically, the first characteristic simulating section 11A uses the moment of inertia M1* and the damping coefficient D1* to generate the phase command value ⁇ 1x for simulating the characteristic of the first synchronous generator. The second characteristic simulating section 12 uses the moment of inertia M2* and the damping coefficient D2* to generate a phase command value ⁇ 2x for simulating the characteristic of the second synchronous generator.
- the characteristics of the first synchronous generator depend on the values of the moment of inertia M1* and the damping factor D1*
- the characteristics of the second synchronous generator depend on the values of the moment of inertia M2* and the damping factor D2*. Note that the moment of inertia M1* is different from the moment of inertia M2*. Furthermore, the damping factor D1* may differ from the damping factor D2*.
- the generator simulating unit 101A simulates the characteristics of both the first synchronous generator and the second synchronous generator. As a result, frequency components due to resonance between each of the first synchronous generator and the second synchronous generator and the electric power system 2 are suppressed, so that the stability of the frequency band corresponding to each frequency component can be improved. .
- FIG. 6 is a diagram for explaining a modification of the generator simulating section. Specifically, FIG. 6A shows a modification of generator simulating section 101 according to the first embodiment. FIG. 6B shows a modification of generator simulating section 101A according to the second embodiment.
- a proportional device 41 is added between the first characteristic simulating unit 11 and the adder 13 compared to the configuration of FIG. Also, a proportional device 42 is added between the second characteristic simulating section 12 and the adder 13 .
- the adder 13 calculates a value obtained by multiplying the active power command value P1x by the gain G1 (that is, P1x ⁇ G1) and a value that is obtained by multiplying the active power command value P2x by the gain G2 (that is, P2x ⁇ G2).
- the added active power command value Pref is output.
- a proportional device 41 is added between the first characteristic simulating unit 11A and the adder 13A.
- a proportional device 42 is added between 13A.
- the adder 13A adds the value obtained by multiplying the phase command value ⁇ 1x by the gain G1 (that is, ⁇ 1x ⁇ G1) and the value obtained by multiplying the phase command value ⁇ 2x by the gain G2 (that is, ⁇ 2x ⁇ G2). Outputs the phase command value ⁇ ref.
- the vibration of the power system 2 can be suppressed more effectively.
- the gain G1 is set larger than the gain G2.
- the gain G2 is set larger than the gain G1.
- the power system 2 includes a first vibration frequency component corresponding to the first synchronous generator and a second vibration frequency component corresponding to the second synchronous generator.
- the first vibration frequency component is a frequency component due to resonance between the electric power system 2 and the first synchronous generator, and the frequency and amplitude caused by the impedance of the electric power system 2 and the moment of inertia and internal impedance of the first synchronous generator.
- the second vibration frequency component is a frequency component due to resonance between the second synchronous generator and the electric power system 2, and the frequency and amplitude caused by the impedance of the electric power system 2 and the moment of inertia and internal impedance of the second synchronous generator.
- the gain G1 and the gain G2 are set based on the magnitude (eg, amplitude) of the first vibration frequency component and the second vibration frequency component. For example, when the first vibration frequency component is greater than the second vibration frequency component, the vibration of the power system 2 is more effectively suppressed by setting the gain G1 to be greater than the gain G2. On the other hand, when the second vibration frequency component is larger than the first vibration frequency component, the vibration of the power system 2 is more effectively suppressed by setting the gain G2 larger than the gain G1.
- the generator simulating unit simulates the two first synchronous generators and the second synchronous generator has been described, but the present invention is not limited to this configuration.
- the generator simulating unit may be configured to simulate three or more synchronous generators.
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Abstract
Description
<全体構成>
図1は、実施の形態1に従う電力変換システムの全体構成を示す図である。電力変換システムは、電力系統2と、変圧器3と、電力変換装置6と、電流検出器7と、電圧検出器8と、蓄電要素60とを含む。電力系統2は、例えば、三相の交流電源である。電力変換装置6は、制御装置100と、電力変換器20とを含む。電力変換器20は、変圧器3を介して、電力系統2の連系点4に接続される。なお、変圧器3の代わりに連系リアクトルが電力変換器20に接続される構成であってもよい。
図2は、制御装置100のハードウェア構成例を示す図である。図2には、コンピュータによって制御装置100を構成する例が示される。
図3は、実施の形態1に従う特性模擬部の具体的な機能構成を示すブロック図である。図3を参照して、特性模擬部10は、除算器30と、減算器31と、比例器32,34と、積分器33,36と、加算器35,37と、演算器38とを含む。
<全体構成>
図4は、実施の形態2に従う電力変換システムの全体構成を示す図である。図4の電力変換システムは、図1の電力変換システムの制御装置100を、制御装置100Aに置き換えたものである。制御装置100Aは、制御装置100の発電機模擬部101を、発電機模擬部101Aに置き換えたものである。発電機模擬部101A以外の構成については、図1の当該構成と同様であるための、その詳細な説明は繰り返さない。
図5は、実施の形態2に従う特性模擬部の具体的な機能構成を示すブロック図である。図5を参照して、特性模擬部10Aは、減算器50,51と、比例器52,54と、積分器53,56と、加算器55とを含む。
(1)発電機模擬部101および発電機模擬部101Aの変形例について説明する。図6は、発電機模擬部の変形例を説明するための図である。具体的には、図6(a)は、実施の形態1に従う発電機模擬部101の変形例を示している。図6(b)は、実施の形態2に従う発電機模擬部101Aの変形例を示している。
Claims (6)
- 蓄電要素に接続された電力変換器と、
前記電力変換器を制御する制御装置とを備え、
前記電力変換器は、前記蓄電要素から出力される直流電力を交流電力に変換して、当該交流電力を電力系統に出力し、
前記制御装置は、
複数の同期発電機の特性を模擬することにより、前記電力変換器に対する電圧指令値を生成する発電機模擬部と、
前記発電機模擬部により生成された前記電圧指令値に基づいて、前記電力変換器に対する制御信号を生成する信号生成部とを含み、
前記発電機模擬部は、
第1同期発電機の特性を模擬することにより、第1指令値を生成する第1特性模擬部と、
前記第1同期発電機の特性とは異なる第2同期発電機の特性を模擬することにより、第2指令値を生成する第2特性模擬部と、
前記第1指令値および前記第2指令値の加算処理を実行する加算器と、
前記第1指令値および前記第2指令値の加算処理結果に基づいて、前記電圧指令値を生成する電圧指令生成部とを含む、電力変換装置。 - 前記第1特性模擬部は、第1有効電力指令値を前記第1指令値として出力し、
前記第2特性模擬部は、第2有効電力指令値を前記第2指令値として出力し、
前記電圧指令生成部は、前記第1有効電力指令値および前記第2有効電力指令値の加算処理結果に従う有効電力が前記電力変換器から出力されるように前記電圧指令値を生成する、請求項1に記載の電力変換装置。 - 前記第1特性模擬部は、第1位相指令値を前記第1指令値として出力し、
前記第2特性模擬部は、第2位相指令値を前記第2指令値として出力し、
前記電圧指令生成部は、前記第1位相指令値および前記第2位相指令値の加算処理結果に従う位相に基づいて前記電圧指令値を生成する、請求項1に記載の電力変換装置。 - 前記第1同期発電機の第1慣性モーメントは、前記第2同期発電機の第2慣性モーメントと異なる、請求項1~請求項3のいずれか1項に記載の電力変換装置。
- 前記第1同期発電機の第1制動係数は、前記第2同期発電機の第2制動係数と異なる、請求項4に記載の電力変換装置。
- 前記加算器は、前記第1指令値に第1ゲインを乗じた値と、前記第2指令値に第2ゲインを乗じた値とを加算し、
前記電力系統は、前記第1同期発電機に対応する第1振動周波数成分および前記第2同期発電機に対応する第2振動周波数成分を含み、
前記第1ゲインおよび前記第2ゲインは、前記第1振動周波数成分および前記第2振動周波数成分の大きさに基づいて設定される、請求項1~請求項5のいずれか1項に記載の電力変換装置。
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WO2019116419A1 (ja) * | 2017-12-11 | 2019-06-20 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
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