CN112701732A - Control method and device of virtual synchronous generator and storage medium - Google Patents
Control method and device of virtual synchronous generator and storage medium Download PDFInfo
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- 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
Abstract
The invention discloses a control method, a device and a storage medium of a virtual synchronous generator, wherein the control mode of the virtual synchronous generator comprises an inertial droop control mode and a dead-beat control mode, and the control method of the virtual synchronous generator comprises the following steps: monitoring the running state of the power grid side; if the power grid side is in a normal state, the virtual synchronous generator operates in an inertial droop control mode; if the power grid side is in a fault state, switching the virtual synchronous generator to a dead beat control mode for operation so as to inhibit the fault current of the virtual synchronous generator until the power grid side recovers to a normal state; the invention can be compatible with symmetrical and asymmetrical power grid side faults, effectively avoids equipment damage caused by overlarge impact current caused by the power grid side faults and effectively improves the stability of the power grid.
Description
Technical Field
The invention relates to the technical field of inverter control, in particular to a control method and device of a virtual synchronous generator and a storage medium.
Background
With the development of society, the stock of traditional fossil energy such as coal and petroleum is reduced year by year, while fossil energy is an important core resource for human development, and all countries face the problem of fossil energy shortage. In addition, fossil energy emits a large amount of harmful gases and greenhouse gases during combustion, resulting in an increasingly deteriorated natural ecological environment. Therefore, to alleviate the crisis of fossil energy and protect natural ecological environment, the vigorous development and use of new energy are inevitable choices in various countries.
The common new energy sources comprise wind energy sources, photovoltaic energy sources and other various forms, and compared with the traditional fossil energy sources, the common new energy sources have the characteristic of typical intermittency, and meanwhile, the output of a new energy source power supply is also usually direct current or variable-frequency alternating current and does not meet the grid-connected power supply requirement of a power system. Therefore, the conversion of the electric energy of the new energy into the important basis for the use of the new energy is realized by the power electronic converter.
When a network side fault occurs, the conventional method is to utilize a virtual synchronous generator to quickly suppress an impulse current by controlling switching, introducing virtual impedance, analyzing an excitation state, judging a fault state with a return difference characteristic, limiting current wave by wave or modifying a VSG reference voltage during the fault and the like.
However, the above method has the disadvantages of difficult application to a virtual synchronous generator without a current-voltage double closed loop, slow suppression speed, low output power quality, small output inductance, complex structure, high nonlinearity, unstable system or inability to reliably suppress asymmetric faults, and the like. And because the overcurrent capacity of the power electronic converter is weak, when the power electronic converter encounters a network side fault, large current is easily formed at a port, so that related equipment is burnt. Therefore, the popularization and application of new energy are severely restricted.
Disclosure of Invention
The invention aims to provide a control method of a virtual synchronous generator, which can be compatible with symmetrical and asymmetrical power grid side faults, effectively avoid equipment damage caused by overlarge impact current caused by the power grid side faults and effectively improve the stability of a power grid.
The invention further aims to provide a control device of the virtual synchronous generator, which can be compatible with symmetrical and asymmetrical power grid side faults, effectively avoid equipment damage caused by overlarge impact current caused by the power grid side faults and effectively improve the stability of a power grid.
Still another object of the present invention is to provide a storage medium, which is compatible with symmetric and asymmetric grid-side faults, and can effectively avoid the damage of equipment due to an excessive impact current caused by the grid-side fault, and effectively improve the stability of the grid.
In order to achieve the purpose, the invention discloses a control method of a virtual synchronous generator, wherein the control mode of the virtual synchronous generator comprises an inertia droop control mode and a dead-beat control mode, and the control method of the virtual synchronous generator comprises the following steps:
s1, monitoring the running state of the power grid side;
s2, if the power grid side is in a normal state, the virtual synchronous generator operates in an inertial droop control mode;
and S3, if the power grid side is in a fault state, switching the virtual synchronous generator to a dead-beat control mode to operate so as to restrain the fault current of the virtual synchronous generator until the power grid side returns to a normal state.
Compared with the prior art, the method has the advantages that the dead-beat control mode is introduced to inhibit the fault current of the virtual synchronous generator at the power grid side in the fault state, so that the damage of equipment caused by overlarge impact current caused by the fault at the power grid side is avoided; in addition, the virtual synchronous generator does not need to pay attention to a symmetric fault or an asymmetric fault when the power grid side fails, and the virtual synchronous generator is switched to the dead-beat control mode to operate only when the power grid side is in a fault state, so that the fault compatibility is effectively improved.
Preferably, the virtual synchronous generator includes: the system comprises a three-phase bridge inverter module, a voltage and current sampling module, a central controller module, a PWM (pulse width modulation) driving module and a switch module, wherein the three-phase bridge inverter module is used for converting direct current electricity on a direct current side into SPWM (sinusoidal pulse width modulation) wave and then converting the SPWM wave into alternating current of power frequency through an LC (inductance-capacitance) filter; the voltage and current sampling module is used for acquiring voltage signals and current signals of the three-phase bridge inverter module and the power grid side, and converting the acquired voltage signals and current signals so as to enable the central controller module to identify and call; the central controller module is used for generating PWM reference signals according to the three-phase bridge inverter module, voltage signals and current signals of a power grid side; and the PWM driving module is used for controlling the on-off of the switch module according to the PWM reference signal so as to switch the control mode of the virtual synchronous generator.
Preferably, in the step (3), the switching the virtual synchronous generator to the deadbeat control mode to suppress the fault current of the virtual synchronous generator until the grid side returns to a normal state includes:
s31, collecting an internal reference voltage value, a power grid side voltage value, an output current value and a direct current side voltage value of the virtual synchronous generator at the moment before the power grid side fails;
s32, calculating the duty ratio of a switch module according to the internal reference voltage value, the grid side voltage value, the output current value and the direct current side voltage value of the virtual synchronous generator;
s33, updating register information of the PWM driving module according to the duty ratio of the switching module;
and S34, the PWM driving module controls the on-off of the switch module according to the duty ratio of the switch module so as to switch the virtual synchronous generator to a dead-beat control mode.
Preferably, in the step (3), the virtual synchronous generator is switched to a dead-beat control mode to operate, so as to suppress the fault current of the virtual synchronous generator until the grid side returns to a normal state, further comprising:
s301, switching a virtual synchronous control link of the virtual synchronous generator into a constant power control mode to suppress fault power of the virtual synchronous generator;
s302, establishing virtual electric connection between the virtual synchronous control link and a power grid side so as to form virtual current between the virtual synchronous control link and the power grid side;
s303, tracking the virtual current;
s304, judging whether the power grid side recovers a normal state or not according to the virtual current.
Preferably, the step (302) specifically includes:
and S3021, establishing a virtual resistor between the virtual synchronous control link and the power grid side.
Preferably, the step (304) specifically includes:
s3041, if a difference between the virtual current and an output current of the virtual synchronous generator in a normal state is less than or equal to a preset difference threshold, recovering the power grid side to a normal state;
s3042, if the difference between the virtual current and the output current of the virtual synchronous generator in the normal state is greater than a preset difference threshold, the power grid side is still in the fault state.
Preferably, the step (1) specifically includes:
s101, monitoring the output current of the virtual synchronous motor;
s102, if the output current of the virtual synchronous motor is smaller than a preset current threshold, marking that the power grid side is in a normal state;
s103, if the output current of the virtual synchronous motor is larger than or equal to a preset current threshold value, marking that the power grid side is in a fault state.
Preferably, the step (3) is further followed by:
and S4, restoring the virtual synchronous generator to the inertial droop control mode to continue to operate.
Correspondingly, the invention also discloses a control device of the virtual synchronous generator, the control mode of the virtual synchronous generator comprises an inertia droop control mode and a dead-beat control mode, and the control device of the virtual synchronous generator comprises:
the monitoring unit is used for monitoring the running state of the power grid side;
the judging unit is used for judging the running state of the power grid side;
the first control unit is used for controlling the virtual synchronous generator to operate in an inertial droop control mode if the power grid side operates in a normal state;
and if the power grid side operates in a fault state, the second control unit is used for controlling the virtual synchronous generator to operate in a dead-beat control mode so as to inhibit the fault current of the virtual synchronous generator until the power grid side returns to a normal state.
Accordingly, the present invention also discloses a storage medium for storing a computer program which, when executed by a processor, implements the control method of the virtual synchronous generator as described above.
Drawings
FIG. 1 is a schematic diagram of the virtual synchronous generator of the present invention;
FIG. 2 is a block flow diagram of a method of controlling a virtual synchronous generator of the present invention;
FIG. 3 is a schematic diagram illustrating the suppression control of fault current by the virtual synchronous generator according to an embodiment of the present invention;
FIG. 4 is a current reference diagram for current control during the grid-side fault of FIG. 3;
FIG. 5 is P in FIG. 3setAnd QsetA reference map for calculation of (c);
FIG. 6 is a reference diagram for port voltage phase extraction calculations in FIG. 3;
fig. 7 is a block diagram showing the configuration of a control device for a virtual synchronous generator according to the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to fig. 3, the control method of the virtual synchronous generator 100 of the present embodiment is suitable for the virtual synchronous generator 100 with high power quality fault ride-through capability, and certainly, is also suitable for a common virtual synchronous generator.
The control modes of the virtual synchronous generator 100 include an inertial droop control mode and a deadbeat control mode. The inertia droop control mode is a common control method for the virtual synchronous generator 100, and is not described herein. The dead-beat control mode is a control mode based on a discrete control theory, and is a control mode aiming at a specific system and aiming at finding an input signal which can enable an output to enter a stable state within the shortest time, aiming at the virtual synchronous generator 100 in the embodiment, the introduction of the dead-beat control mode is to quickly restrain an impact current generated by the output end of the virtual synchronous generator 100 when a power grid side fault occurs, so that the equipment is prevented from being damaged due to the overlarge impact current.
The control method of the virtual synchronous generator 100 includes the steps of:
and S1, monitoring the running state of the power grid side.
The operation state of the power grid side comprises a normal state and a fault state. It can be understood that the fault state refers to a fault that a fault occurring on the grid side may affect the normal operation of the virtual synchronous generator 100 and may damage the related devices, and a fault that a fault occurring on the grid side may not affect the normal operation of the virtual synchronous generator 100 and may damage the related devices may be classified as a normal state, which is not described herein again.
S2, if the grid side is in a normal state, the virtual synchronous generator 100 operates in an inertial droop control mode.
It is understood that the grid side is in a normal state in the normal state, and therefore, the virtual synchronous generator 100 is operated in the inertial droop control mode in the normal state.
And S3, if the power grid side is in a fault state, switching the virtual synchronous generator 100 to a dead-beat control mode to operate so as to restrain the fault current of the virtual synchronous generator 100 until the power grid side returns to a normal state.
It is understood that the restoration of the grid side to the normal state may be performed manually or automatically.
Preferably, the virtual synchronous generator 100 includes: the three-phase bridge type inverter module comprises a three-phase bridge type inverter module 1, a voltage and current sampling module 2, a central controller module 3, a PWM driving module 4 and a switch module, wherein the switch module is a circuit breaker. The three-phase bridge inverter module 1 is used for modulating the direct current at the direct current side into SPWM wave through the three-phase bridge, and converting the SPWM wave into alternating current of power frequency through the LC filter so as to realize an energy channel of power conversion.
The voltage and current sampling module 2 is used for respectively collecting voltage signals and current signals of the three-phase bridge inverter module 1 and the power grid side, and converting the collected voltage signals and current signals for the central controller module 3 to recognize and call.
The central controller module 3 is configured to receive data uploaded by the voltage and current sampling module 2, and generate a PWM reference signal according to the data uploaded by the voltage and current sampling module 2 (i.e., the voltage signal and the current signal of the three-phase bridge inverter module 1 and the grid side).
The PWM driving module 4 is configured to receive the PWM reference signal and amplify the PWM reference signal with appropriate power to meet the driving requirement of the three-phase bridge inverter module 1, and the PWM driving module 4 controls the on/off of the switch module according to the PWM reference signal to switch the control mode of the virtual synchronous generator 100.
Preferably, in the step (3), the switching the virtual synchronous generator 100 to the deadbeat control mode to suppress the fault current of the virtual synchronous generator 100 until the grid side returns to the normal state specifically includes:
and S31, collecting an internal reference voltage value, a power grid side voltage value, an output current value and a direct current side voltage value of the virtual synchronous generator 100 at the moment before the power grid side fails.
And S32, calculating the duty ratio of the switch module according to the internal reference voltage value, the grid side voltage value, the output current value and the direct current side voltage value of the virtual synchronous generator 100.
And S33, updating the register information of the PWM driving module 4 according to the duty ratio of the switching module.
And S34, the PWM driving module 4 controls the on-off of the switch module according to the duty ratio of the switch module so as to switch the virtual synchronous generator 100 to a dead-beat control mode.
Preferably, in the step (3), switching the virtual synchronous generator 100 to a deadbeat control mode to suppress the fault current of the virtual synchronous generator 100 until the grid side returns to a normal state, further includes:
s301, switching a virtual synchronization control link of the virtual synchronous generator 100 to a constant power control mode to suppress the fault power of the virtual synchronous generator 100.
S302, virtual electric connection is established between the virtual synchronous control link and the power grid side, so that virtual current is formed between the virtual synchronous control link and the power grid side.
And S303, tracking the virtual current.
S304, judging whether the power grid side recovers a normal state or not according to the virtual current.
Preferably, the step (302) specifically includes:
and S3021, establishing a virtual resistor between the virtual synchronous control link and the power grid side.
Preferably, the step (304) specifically includes:
s3041, if the difference between the virtual current and the output current of the virtual synchronous generator 100 in the normal state is less than or equal to a preset difference threshold, the power grid side returns to the normal state;
s3042, if the difference between the virtual current and the output current of the virtual synchronous generator 100 in the normal state is greater than a preset difference threshold, the grid side is still in the fault state.
While the grid side is still in the fault state, the virtual synchronous generator 100 remains operating in a deadbeat control mode.
Preferably, the step (1) specifically includes:
s101, monitoring the output current of the virtual synchronous motor;
s102, if the output current of the virtual synchronous motor is smaller than a preset current threshold, marking that the power grid side is in a normal state;
s103, if the output current of the virtual synchronous motor is larger than or equal to a preset current threshold value, marking that the power grid side is in a fault state.
Preferably, the step (3) is further followed by:
and S4, restoring the virtual synchronous generator 100 to the inertial droop control mode to continue to operate.
Referring to fig. 1 to 6, the following describes the procedure of the control method of the virtual synchronous generator 100 according to the present invention.
The method comprises the following steps: when the grid side is in a normal state, the virtual synchronous generator 100 operates in an inertial droop control mode.
Step two: when a grid fault occurs on the grid side, the virtual synchronous generator 100 is switched to a dead-beat control mode to operate. The virtual synchronous generator 100 can respond to a fault very quickly in the deadbeat control mode, thereby limiting a fault current quickly and effectively, and can ensure the power quality of the output current of the virtual synchronous generator 100, thereby providing an unrivaled advantage in terms of suppressing a fault inrush current.
Meanwhile, the virtual synchronous control link of the virtual synchronous generator 100 is switched to a constant power control mode to suppress the fault power of the virtual synchronous generator 100, and virtual impedance is introduced to connect the virtual synchronous generator 100 with the power grid to track the dead beat output current, so as to monitor and judge whether the power grid side is recovered to a normal state in real time.
Step three: after clearing the grid fault, the virtual synchronous generator 100 should wait for a period of time until the virtual current is controlled to be very close to the actual output current, and then the grid side is considered to be restored to the normal state.
Step four: when the virtual synchronous generator 100 is switched back to the inertial droop control mode again, the output current of the virtual synchronous generator 100 is adjusted to be in a normal state, so that the external output of the virtual synchronous generator 100 is not affected.
Fig. 1 shows a block diagram of the virtual synchronous generator 100. In the figure, the virtual current is
When the grid is in normal state, S, as shown in FIG. 3pAnd SqIn the open state. S1、S2、S3And S4Are connected to position 1. Therefore, the virtual synchronous generator 100 operates in the inertial droop control mode.
When a serious grid fault occurs on the grid side, at this time, whether the grid side fault occurs is detected by detecting the instantaneous current at the output end of the three-phase bridge inverter module 10, and the working mode of the virtual synchronous generator 100 is quickly switched to the dead-beat control mode. When any phase of the fault rush current output by the virtual synchronous generator 100 is greater than a protection reference value, SpAnd SqWill be turned off; s1、S2、S3And S4Is switched to position 2, thereby switching the virtual synchronous generator 100 to operate in deadbeat control mode.
The reference current calculation method for the a phase in the deadbeat control mode is as shown in equation (2), and the reference current calculation methods for the B phase and the C phase in the deadbeat control mode are as shown in equation (3), i.e., the B phase and the C phase in the deadbeat control mode can be obtained by rotating the a phase by 120 ° and-120 °, respectively.
isetA＝Iset·sin(θg+ δ) formula (2);
carrying out park transformation on the reference current and the internal potential in the dead beat control mode by taking the internal potential phase angle as a rotation angle to obtain isd、isq、udAnd uqThen, the virtual power output by the virtual synchronous generator 100 at this time can be obtained by calculating according to the formula (4), and the power is used as the reference P for virtual synchronous controlsetAnd QsetCan guarantee the virtual current isGradually approaching hysteresis loop output current iout。
The details of the deadbeat control mode are as follows:
equation (5) is an implementation expression of the deadbeat control mode:
in the formula (5), ivsg(n) inverter output current sampled at time n, uvsg(n) is an inverter internal reference voltage at time n, ug(n) and i* vsg(n +1) is the grid voltage sampled at the moment n and the inverter reference current at the moment (n +1), D (n) is the duty ratio of the inverter switching tube, udcAnd (n) is the voltage value of the direct current side.
Firstly, obtaining a reference voltage value inside the virtual synchronous generator 100, a network side voltage value, an inverter output current value and a direct current side voltage value at the previous moment through a voltage and current sampling module; and then, substituting the state quantities such as the voltage and the current obtained by sampling into a formula (5), substituting the tracked current reference value, the filter inductance value and the sampling time into the formula (5) for calculation to obtain the duty ratio D (n) of the switching tube, and updating a PWM register in the controller by using the duty ratio, namely finishing the control process of one-time dead beat.
Correspondingly, the present invention also discloses a control device of the virtual synchronous generator 100, the control mode of the virtual synchronous generator 100 includes an inertial droop control mode and a dead-beat control mode, the control device of the virtual synchronous generator 100 includes:
the monitoring unit 10 is used for monitoring the running state of the power grid side;
a determination unit 20 configured to determine an operation state of the grid side;
a first control unit 30, configured to control the virtual synchronous generator 100 to operate in an inertial droop control mode if the grid side operates in a normal state;
and a second control unit 40, configured to control the virtual synchronous generator 100 to operate in a dead-beat control mode if the power grid side operates in a fault state, so as to suppress a fault current of the virtual synchronous generator 100 until the power grid side returns to a normal state.
Accordingly, the present invention also discloses a storage medium for storing a computer program which, when executed by a processor, implements the control method of the virtual synchronous generator 100 as described above.
With reference to fig. 1 to 7, the virtual synchronous generator 100 in the fault state on the grid side is suppressed by introducing the dead-beat control mode, so as to avoid equipment damage caused by excessive impact current due to grid-side fault; in addition, the virtual synchronous generator 100 is suitable for being switched to the deadbeat control mode to operate only by needing to be in a fault state on the power grid side without paying attention to the symmetric fault or the asymmetric fault when the power grid side fails, the continuous output of high-power quality current of the virtual synchronous generator 100 during the fault period on the power grid side can be ensured, and the fault compatibility is effectively improved.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. A control method of a virtual synchronous generator, wherein control modes of the virtual synchronous generator include an inertia droop control mode and a dead-beat control mode, the control method of the virtual synchronous generator comprising the steps of:
monitoring the running state of the power grid side;
if the power grid side is in a normal state, the virtual synchronous generator operates in an inertial droop control mode;
and if the power grid side is in a fault state, switching the virtual synchronous generator to a dead beat control mode for operation so as to inhibit the fault current of the virtual synchronous generator until the power grid side is recovered to a normal state.
2. The method of controlling a virtual synchronous generator according to claim 1, wherein the virtual synchronous generator includes: the system comprises a three-phase bridge inverter module, a voltage and current sampling module, a central controller module, a PWM (pulse width modulation) driving module and a switch module, wherein the three-phase bridge inverter module is used for converting direct current electricity on a direct current side into SPWM (sinusoidal pulse width modulation) wave and then converting the SPWM wave into alternating current of power frequency through an LC (inductance-capacitance) filter; the voltage and current sampling module is used for acquiring voltage signals and current signals of the three-phase bridge inverter module and the power grid side, and converting the acquired voltage signals and current signals so as to enable the central controller module to identify and call; the central controller module is used for generating PWM reference signals according to the three-phase bridge inverter module, voltage signals and current signals of a power grid side; and the PWM driving module is used for controlling the on-off of the switch module according to the PWM reference signal so as to switch the control mode of the virtual synchronous generator.
3. The method for controlling a virtual synchronous generator according to claim 1, wherein the switching the virtual synchronous generator to the deadbeat control mode to suppress the fault current of the virtual synchronous generator until the grid side returns to a normal state specifically comprises:
acquiring an internal reference voltage value, a power grid side voltage value, an output current value and a direct current side voltage value of the virtual synchronous generator at the moment before the power grid side fails;
calculating the duty ratio of a switch module according to the internal reference voltage value, the grid side voltage value, the output current value and the direct current side voltage value of the virtual synchronous generator;
updating register information of a PWM driving module according to the duty ratio of the switching module;
and the PWM driving module controls the on-off of the switch module according to the duty ratio of the switch module so as to switch the virtual synchronous generator to a dead-beat control mode.
4. The method for controlling a virtual synchronous generator according to claim 1, wherein the virtual synchronous generator is switched to a deadbeat control mode operation to suppress a fault current of the virtual synchronous generator until the grid side returns to a normal state, further comprising:
switching a virtual synchronous control link of the virtual synchronous generator into a constant power control mode to suppress fault power of the virtual synchronous generator;
establishing virtual electric connection between the virtual synchronous control link and the power grid side so as to form virtual current between the virtual synchronous control link and the power grid side;
tracking the virtual current;
and judging whether the power grid side recovers a normal state or not according to the virtual current.
5. The method for controlling a virtual synchronous generator according to claim 4, wherein the establishing a virtual electrical connection between the virtual synchronous control link and the grid side to form a virtual current between the virtual synchronous control link and the grid side includes:
and establishing a virtual resistor between the virtual synchronous control link and the power grid side.
6. The method for controlling a virtual synchronous generator according to claim 4, wherein the determining whether the grid side returns to a normal state according to the virtual current specifically includes:
if the difference value between the virtual current and the output current of the virtual synchronous generator in the normal state is smaller than or equal to a preset difference threshold value, the power grid side returns to the normal state;
and if the difference value between the virtual current and the output current of the virtual synchronous generator in the normal state is larger than a preset difference value threshold value, the power grid side is still in the fault state.
7. The method for controlling a virtual synchronous generator according to claim 1, wherein the monitoring of the operation state of the grid side specifically comprises:
monitoring the output current of the virtual synchronous motor;
if the output current of the virtual synchronous motor is smaller than a preset current threshold value, marking that the power grid side is in a normal state;
and if the output current of the virtual synchronous motor is greater than or equal to a preset current threshold value, marking that the power grid side is in a fault state.
8. The method for controlling the virtual synchronous generator according to claim 1, wherein if the grid side is in a fault state, the virtual synchronous generator is switched to a deadbeat control mode to operate so as to suppress a fault current of the virtual synchronous generator until the grid side returns to a normal state, and then further comprising:
and restoring the virtual synchronous generator to the inertial droop control mode to continue to operate.
9. A control apparatus of a virtual synchronous generator, characterized in that control modes of the virtual synchronous generator include an inertia droop control mode and a deadbeat control mode, the virtual synchronous generator control apparatus comprising:
the monitoring unit is used for monitoring the running state of the power grid side;
the judging unit is used for judging the running state of the power grid side;
the first control unit is used for controlling the virtual synchronous generator to operate in an inertial droop control mode if the power grid side operates in a normal state;
and if the power grid side operates in a fault state, the second control unit is used for controlling the virtual synchronous generator to operate in a dead-beat control mode so as to inhibit the fault current of the virtual synchronous generator 100 until the power grid side returns to a normal state.
10. A storage medium for storing a computer program, characterized in that: the program, when executed by a processor, implements a method of controlling a virtual synchronous generator according to any one of claims 1 to 8.
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| JP2019115194A (en) * | 2017-12-25 | 2019-07-11 | 株式会社デンソー | Power converter control device |
| CN109274125A (en) * | 2018-11-27 | 2019-01-25 | 南方电网科学研究院有限责任公司 | A kind of grid-connected control method and device for multi-machine parallel connection virtual synchronous inverter |
| CN110176787A (en) * | 2019-06-28 | 2019-08-27 | 广东志成冠军集团有限公司 | A kind of load virtual synchronous machine control device and method having both harmonic compensation |
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