CN115459292A - Grid-connected inverter fault ride-through control method based on virtual synchronous generator control - Google Patents
Grid-connected inverter fault ride-through control method based on virtual synchronous generator control Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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Abstract
The invention discloses a grid-connected inverter fault ride-through control method based on virtual synchronous generator control, which mainly comprises the following control measures: adding a re-setting of an active power compensation item and a reactive feedback coefficient; the difference value between the given active power and the output active power can be effectively reduced by adding the active power compensation item, and the power angle stability of the system is greatly improved; meanwhile, the maximum output current operation is realized when the voltage of the power grid drops greatly by utilizing the inherent poor regulation characteristic of the reactive control loop and combining the output current threshold of the grid-connected inverter; and when the grid voltage drops or rises slightly, the effective control of the grid voltage is realized by utilizing the target voltage control value. The method is suitable for various PWM-controlled three-phase inverter devices formed by various high-frequency switch self-turn-off devices under a weak-voltage support power grid, can exert the maximum reactive power support voltage capability of a grid-connected inverter while improving the power angle stability of the system, and has good transient stability.
Description
Technical Field
The invention belongs to the technical field of new energy grid-connected control, and particularly relates to a grid-connected inverter fault ride-through control method based on virtual synchronous generator control.
Background
With the rapid increase of installed capacity of new energy power generation, in the foreseeable future, the power system in China will take high-proportion new energy as a main characteristic, and a local power grid will even gradually move towards a pure new energy power system. And part of remote areas apply new energy in a large scale and simultaneously have fewer local matched thermal power generating units, so that the frequency regulation and reactive/voltage support capability are weaker, and a weak synchronous voltage support power grid system is formed or is about to be formed. The large access of power electronic equipment leads to the reduction of effective rotational inertia of a system, the rapid decrease of dynamic reactive power reserves, and the increase of risks of safety and stability problems such as power grid desynchronization, voltage breakdown, frequency instability, broadband oscillation and the like.
The inverter controlled based on the Virtual Synchronous Generator (VSG) can well provide voltage and frequency support for the power grid under the large background that the power grid is gradually weakened by virtue of the characteristics of the inverter, can improve the stability of the weak power grid to a certain extent by matching with virtual impedance, and plays a positive role in safe and stable operation of the power grid. The faults of the traditional power grid mainly comprise transverse faults and longitudinal faults, wherein the transverse faults (short-circuit faults) have the highest occurrence rate and the most serious influence. In the background of voltage drop caused by short-circuit fault, how to ensure safe operation of the VSG while continuously providing reactive voltage support for the power grid has become a hotspot of VSG fault ride-through research.
At present, the fault ride-through for the VSG at home and abroad is mainly divided into the following modes: (1) The method ignores the influence of active frequency, lacks control on the stability of a system power angle, and is not suitable for being applied under the background of a weak power grid; (2) Setting the given power value again, setting the active/reactive power value again according to the voltage drop degree of the power grid, not changing a control structure, but having errors in the sampling and calculating processes, and hardly exerting the output capability of the inverter to the maximum; (3) The method comprises the following steps of adding a current limiting measure on a current loop to inhibit the overcurrent of a converter, wherein the instability phenomenon can occur when a power grid is recovered due to overlarge output of a voltage loop integrator when the method is operated for a long time; (4) The virtual impedance is added, and under the condition that the internal potential is not changed, the output current is controlled in the form of additional virtual impedance, so that fault ride-through is realized, but larger abrupt current can be caused during the switching of the virtual impedance, and the dynamic stability of the inverter is not facilitated.
Experiments prove that the control mode can actually improve the transient stability of new energy grid connection to a certain extent, but the power angle stability of the system is not considered, and the maximum voltage supporting capability of the inverter is not exerted when the power grid has a serious fault. Therefore, it is very meaningful to research a fault ride-through control mode which considers the power angle stability of the system and has corresponding voltage supporting capability for different degrees of grid voltage drop faults.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a grid-connected inverter fault ride-through control method based on virtual synchronous generator control, which can improve the power angle stability of a system, can exert the maximum reactive power supporting voltage capability of the grid-connected inverter and has good transient stability.
A grid-connected inverter fault ride-through control method based on virtual synchronous generator control comprises the following steps:
(1) Collecting three-phase power grid voltage, three-phase grid-connected point voltage, three-phase output current of a grid-connected inverter and three-phase grid-connected point current, and determining components of the three-phase power grid voltage, the three-phase grid-connected point voltage, the three-phase output current and the three-phase grid-connected point current in a rotating d-q coordinate system through dq transformation;
(2) Calculating the output active power P of the grid-connected inverter according to the components of the three-phase grid-connected point voltage and the three-phase grid-connected point current in a rotating d-q coordinate system e And output reactive power Q e ；
(3) Calculating an internal potential E and a phase theta controlled by the virtual synchronous generator by utilizing an active frequency control loop and a reactive voltage control loop of the traditional virtual synchronous generator;
(4) Monitoring the voltage amplitude U of the power grid g (ii) a When U is formed g When the voltage is lower than 0.9pu, starting fault ride-through control; if U is present g When the voltage is between 0.9pu and 1.1pu, the normal operation mode is adopted for operation; if U is present g When the voltage is higher than 1.1pu, starting fault ride-through control;
(5) When starting the fault ride-through control, the active frequency control loop of the virtual synchronous generator adds a compensation item delta P and the reactive feedback coefficient in the reactive voltage control loop is switched to D q * ；
(6) Active shaft voltage instruction is calculated by using voltage and current double closed loops and virtual impedance control
And reactive axis voltage command
Then obtaining the component of the voltage command in a static alpha-beta coordinate system through Park inverse transformation; and then a group of PWM signals are obtained through SVPWM technology construction according to the component of the voltage command in the static alpha-beta coordinate system so as to control the grid-connected inverter.
In the above technical solution, further, in the step (2), the output active power P of the grid-connected inverter is calculated by the following equation e And output reactive power Q e ：
Wherein: u shape od And U oq Respectively a d-axis component and a q-axis component of the three-phase grid-connected point voltage in a rotating d-q coordinate system, I od And I oq Respectively a d-axis component and a q-axis component of the three-phase grid-connected point current in a rotating d-q coordinate system.
In the step (3), the internal potential E and the phase θ controlled by the virtual synchronous generator are calculated by the following equations:
θ＝∫ωdt
wherein: p ref And Q ref Are given as an active power reference and a reactive power reference, U, respectively ref For a given control voltage, U o Is the grid-connected point voltage amplitude, J is the virtual moment of inertia, D q And D are respectively a given reactive feedback coefficient and a given virtual damping coefficient, K is an integral coefficient,omega is the virtual angular frequency, omega n ＝314，
In the step (4), the grid voltage amplitude U is calculated by the following formula g ：
Wherein: u shape gd And U gq The d-axis component and the q-axis component of the grid voltage under the rotating coordinate system are respectively.
In the step (5), an active power compensation term delta P and a reactive feedback coefficient resetting value D are obtained through calculation by the following formula q * ：
δ o ＝∫(ω-ω n )dt
Wherein: u shape of And U gf The voltage amplitude of the grid-connected point and the voltage amplitude of the power grid under the fault are U on And U gn Are respectively under rated operationDot voltage amplitude and grid voltage amplitude, P ef And Q ef Respectively outputting active power and reactive power X for the grid-connected inverter under the fault g For line reactance of the power grid, I max Is the inverter output current threshold (1.5 times of rated output current), U e For the control voltage value in the fault-ride-through control mode,
for improved control voltage values in fault ride-through control mode, U low_ref And U up_ref Respectively a target control voltage lower limit set value, an upper limit set value, delta o The work angle is shown.
In the step (6), the voltage and current double closed-loop control is carried out by the following formula to obtain an active shaft voltage command
And reactive axis voltage command
Wherein: l is v Is a virtual reactance, K p And K i Proportional and integral coefficients for the PI controller,
and
respectively giving an active voltage instruction and a reactive voltage instruction, U for the control of a grid-connected point od And U oq Active voltage and reactive voltage are controlled for the grid-connected point respectively,
and
respectively giving an active current instruction and a reactive current instruction, I, to the current inner loop sd And I sq Respectively, the active current and the reactive current of the current inner loop, I od And I oq Active current and reactive current are controlled for the grid-connected point respectively,
and
respectively an active voltage instruction and a reactive voltage instruction, L, at the output end of the grid-connected inverter f And C f Respectively a filter inductor and a filter capacitor.
The invention has the beneficial effects that:
compared with the traditional low-voltage ride-through control mode, the invention has better power angle stability and voltage stability, and the main control measures are as follows: adding a re-setting of an active power compensation item and a reactive feedback coefficient; the difference value between the given active power and the output active power can be effectively reduced by adding the active power compensation item, and the power angle stability of the system is greatly improved; meanwhile, the operation with the maximum output current is realized when the voltage of the power grid drops greatly by utilizing the inherent poor regulation characteristic of the reactive control loop and combining the output current threshold of the grid-connected inverter; and when the grid-connected voltage drops or rises slightly, the effective control of the grid-connected voltage is realized by using the target voltage control value. The invention utilizes the output current threshold value of the inverter, so the risk of overcurrent of the inverter does not exist; meanwhile, the target control voltage is set to cope with different power grid voltage drop degrees, and the large-amplitude, small-amplitude drop and small-amplitude voltage rise scenes of the power grid voltage can be coped with; the invention is suitable for various PWM controlled three-phase inverter devices formed by various high-frequency switch self-turn-off devices under a weak voltage support power grid, such as grid-connected devices of power generation systems of wind energy, solar energy, fuel cells and the like, and power electronic devices of flexible alternating current transmission systems.
Drawings
Fig. 1 is a schematic diagram of a grid-connected control principle of a conventional virtual synchronous generator.
Fig. 2 is a schematic diagram of the improvement measure of the active frequency control loop and the reactive voltage control loop of the present invention.
Fig. 3 is a simulation comparison graph of output voltage, output reactive power and output current of the grid-connected inverter under the traditional control and the control strategy of the invention when the voltage of the power grid drops to 0.2 pu.
Fig. 4 is a comparison graph of the output voltage of the grid-connected inverter under the control strategy of the conventional control and the present invention when the grid voltage drops to 0.8 pu.
Fig. 5 is a comparison graph of the output voltage of the grid-connected inverter under the control strategy of the invention and the traditional control when the grid voltage is slightly increased.
Detailed Description
In order to describe the present invention more specifically, the following describes the fault-ride-through control method of the virtual synchronous generator according to the present invention in detail with reference to the accompanying drawings and the detailed description.
Taking a grid-connected operation condition of a 1.5MW grid-connected inverter as an example, as shown in fig. 1, the grid-connected operation condition includes a DC voltage source V dc Filter inductor L f Filter capacitor C f Line reactance X g The three-phase full-bridge inverter comprises a large power grid and a three-phase full-bridge inverter circuit formed by six IGBT (insulated gate bipolar transistor) switching tubes.
As shown in fig. 3, the method for controlling fault ride-through of a virtual synchronous generator adopted by the grid-connected inverter includes the following steps:
(1) Firstly, two groups of Hall voltage sensors are utilized to respectively acquire three-phase power grid voltage U ga ～U gc Three-phase grid-connected voltage U of grid-connected inverter grid-connected point oa ～U oc Respectively collecting three-phase output current I of the grid-connected inverter by using two groups of Hall current sensors sa ～I sc And three-phase grid-connected current I of grid-connected point of grid-connected inverter oa ～I oc ；
Then, controlling by using a virtual synchronous generator to obtain the angular frequency omega and the phase theta of the virtual synchronous generator;
finally, for three-phase network voltage U ga ～U gc Three-phase grid-connected point voltage U oa ～U oc Three-phase output current I sa ～I sc And three-phase grid-connected point current I oa ～I oc D-axis component U of three-phase grid voltage in a rotating d-q coordinate system is obtained by dq conversion gd And q-axis component U gq D-axis component U of three-phase grid-connected point voltage in rotating d-q coordinate system od And q-axis component U oq、 D-axis component I of three-phase output current in rotating d-q coordinate system sd And q-axis component I sq And d-axis component I of three-phase grid-connected point current in a rotating d-q coordinate system od And q-axis component I oq (ii) a The transformation matrix of the dq transformation is as follows:
(2) According to the components of the three-phase grid-connected point voltage and the three-phase grid-connected point current in the rotating d-q coordinate system, the output active power P of the grid-connected inverter is calculated by a power calculation module (power calculation) through the following formula e And output reactive power Q e ：
Wherein: u shape od And U oq Respectively a d-axis component and a q-axis component of the three-phase grid-connected point voltage in a rotating d-q coordinate system, I od And I oq Respectively a d-axis component and a q-axis component of the three-phase grid-connected point current in a rotating d-q coordinate system.
(3) Calculating the internal potential E and the phase theta controlled by the virtual synchronous generator by utilizing an active frequency control loop and a reactive voltage control loop of the traditional virtual synchronous generator:
θ＝∫ωdt
wherein: p ref And Q ref Respectively a given active power reference quantity and a given reactive power reference quantity, U ref For a given control voltage, U o Is the grid-connected point voltage amplitude, J is the virtual moment of inertia, D q D is a given reactive feedback coefficient and a given virtual damping coefficient respectively, K is an integral coefficient, and omega is a virtual angular frequency; in this embodiment, P ref ＝1.5，Q ref ＝0，K＝30，D＝550，D q ＝0.0045，U ref ＝311，J＝20，ω n ＝314，
(4) To the voltage amplitude U of the power grid g Monitoring is carried out; when U is formed g When the voltage is lower than 0.9pu, starting fault ride-through control; if U is g When the pressure is 0.9pu-1.1pu, positive pressure is adoptedRunning in a normal running mode; if U is g When the voltage is between 1.1pu and 1.3pu, starting fault ride-through control; grid voltage amplitude U g The calculation formula is as follows:
wherein: u shape gd And U gq Respectively a d-axis component and a q-axis component of the grid voltage under a rotating d-q coordinate system.
(5) When starting the fault ride-through control, as shown in fig. 2, a compensation term Δ P is added to the active frequency control loop of the virtual synchronous generator and the reactive feedback coefficient in the reactive voltage control loop is switched to D q * ：
δ o ＝∫(ω-ω n )dt
Wherein: u shape of And U gf The voltage amplitude of the grid-connected point and the voltage amplitude of the power grid under the fault are U on And U gn The grid-connected point voltage amplitude and the grid voltage amplitude under rated operation are respectively P ef And Q ef Respectively under faultThe grid inverter outputs active power and reactive power, X g For line reactance of the power grid, I max Is the inverter output current threshold (1.5 times rated output current), U e For the control voltage value in the fault-ride-through control mode,
for improved control voltage values in fault ride-through control mode, U low_ref ＝290，U up_ref ＝320，δ o The work angle is shown.
(6) Active shaft voltage instruction is calculated by using voltage and current double closed loops and virtual impedance control
And reactive axis voltage command
Wherein: l is v Is a virtual reactance, K p And K i Proportional and integral coefficients for the PI controller,
and
respectively giving an active voltage command and a reactive voltage command, U, for the grid-connected point control od And U oq The active voltage and the reactive voltage are respectively controlled for the grid-connected point,
and
respectively giving an active current instruction and a reactive current instruction, I, to the current inner loop sd And I sq Respectively, the active current and the reactive current of the current inner loop, I od And I oq Active current and reactive current are controlled for the grid-connected point respectively,
and
respectively an active voltage instruction and a reactive voltage instruction, L, at the output end of the grid-connected inverter f And C f Respectively a filter inductor and a filter capacitor. In this embodiment, K p ＝0.3，K i ＝5，L v ＝0.0012。
Then, the active shaft voltage instruction is given
And reactive axis voltage command
Carrying out Park inverse transformation to obtain an alpha axis component V of the voltage command in a static alpha-beta coordinate system α And a beta axis component V β (ii) a The transformation matrix of the Park inverse transformation is as follows:
finally, the component V in the stationary alpha-beta coordinate system is determined according to the voltage command α And V β Obtaining a group of PWM signals S through the construction of an SVPWM modulation module a ～S c So as to carry out switch control on the IGBT in the grid-connected inverter.
The simulation is carried out on the grid-connected operation condition of the grid-connected inverter under the control method of the embodiment; referring to fig. 3, it can be seen from comparison with a traditional control strategy for fixing a reactive feedback coefficient that when the grid voltage drops greatly (drops to 0.2 pu), by adopting the embodiment, the grid-connected inverter can realize maximum output current operation while ensuring stable operation, and maximally realize reactive support voltage. Referring to fig. 4, it can be seen from the control strategy comparing with the conventional fixed reactive feedback coefficient that when the grid voltage drops to a small extent (drops to 0.8 pu), the embodiment can effectively control the voltage of the grid-connected point, and the voltage is raised to a position near 1 pu. Referring to fig. 5, when the grid voltage rises slightly, compared with a traditional fixed reactive feedback coefficient control mode, the embodiment can effectively control the voltage of a grid-connected point to 1.05pu. Therefore, compared with the traditional control mode of fixing the reactive feedback coefficient, the control method has a better control effect on the aspect of reactive support voltage capability.
In summary, according to the embodiment, the maximum reactive support voltage can be realized by the maximum output current when the grid voltage drops greatly, and the grid-connected point voltage can be strictly controlled within a reliable operation voltage range by virtue of the control superiority when the grid voltage drops or rises slightly, so that the reactive support capability of the grid-connected inverter is improved, and the stable operation of the grid-connected inverter under the grid voltage fault is realized.
Claims (6)
1. A grid-connected inverter fault ride-through control method based on virtual synchronous generator control comprises the following steps:
(1) Collecting three-phase power grid voltage, three-phase grid-connected point voltage, three-phase output current of a grid-connected inverter and three-phase grid-connected point current, and determining components of the three-phase power grid voltage, the three-phase grid-connected point voltage, the three-phase output current and the three-phase grid-connected point current in a rotating d-q coordinate system through dq transformation;
(2) Calculating the output active power P of the grid-connected inverter according to the components of the three-phase grid-connected point voltage and the three-phase grid-connected point current in the rotating d-q coordinate system e And output reactive power Q e ；
(3) Calculating an internal potential E and a phase theta controlled by the virtual synchronous generator by utilizing an active frequency control loop and a reactive voltage control loop of the traditional virtual synchronous generator;
(4) Monitoring the voltage amplitude U of the power grid g : when U is turned g When the voltage is lower than 0.9pu, starting fault ride-through control; if U is present g When the voltage is between 0.9pu and 1.1pu, the normal operation mode is adopted for operation; if U is g When the voltage is higher than 1.1pu, starting fault ride-through control;
(5) When starting the fault ride-through control, the active frequency control loop of the virtual synchronous generator adds a compensation item delta P and the reactive feedback coefficient in the reactive voltage control loop is switched to D q * ；
(6) Calculating to obtain an active shaft voltage instruction by using voltage and current double closed loops and virtual impedance control
And reactive axis voltage command
Then obtaining the component of the voltage command in a static alpha-beta coordinate system through Park inverse transformation; and then a group of PWM signals are obtained through SVPWM technology construction according to the component of the voltage command in the static alpha-beta coordinate system so as to control the grid-connected inverter.
2. The virtual synchronous generator control-based grid-connected inverter fault ride-through control method according to claim 1, characterized in that: what is needed isIn the step (2), the output active power P of the grid-connected inverter is calculated by the following equation e And output reactive power Q e ：
Wherein: u shape od And U oq Respectively a d-axis component and a q-axis component of the three-phase grid-connected point voltage in a rotating d-q coordinate system, I od And I oq Respectively a d-axis component and a q-axis component of the three-phase grid-connected point current in a rotating d-q coordinate system.
3. The grid-connected inverter fault ride-through control method based on virtual synchronous generator control according to claim 2, characterized in that: in the step (3), the internal potential E and the phase θ controlled by the virtual synchronous generator are calculated by the following equations:
θ＝∫ωdt
wherein: p is ref And Q ref Are given as an active power reference and a reactive power reference, U, respectively ref For a given control voltage, U o Is the voltage amplitude of the grid-connected point, J is the virtual moment of inertia, D q And D are respectively a given reactive feedback coefficient and a given virtual damping coefficient, K is an integral coefficient, omega is a virtual angular frequency, omega n ＝314，
4. The grid-connected inverter fault ride-through control method based on virtual synchronous generator control according to claim 3, characterized in that: in the step (4), the grid voltage amplitude U is calculated by the following formula g ：
Wherein: u shape gd And U gq Respectively a d-axis component and a q-axis component of the grid voltage under a rotating d-q coordinate system.
5. The virtual synchronous generator control-based grid-connected inverter fault ride-through control method according to claim 4, characterized in that: in the step (5), an active power compensation term delta P and a reactive feedback coefficient resetting value D are obtained through calculation by the following formula q * ：
δ o ＝∫(ω-ω n )dt
Wherein: u shape of And U gf The grid-connected point voltage amplitude and the grid voltage amplitude under the fault are respectively U on And U gn The voltage amplitude of the grid-connected point and the voltage amplitude of the power grid under rated operation, P ef And Q ef Respectively outputting active power and reactive power X for the grid-connected inverter under the fault g For line reactance of the power grid, I max For the inverter output current threshold, I max Taking 1.5 times of rated output current, U e For the control voltage value in the fault-ride-through control mode,
for improved control voltage values in fault ride-through control mode, U low_ref And U up_ref Respectively a target control voltage lower limit set value, an upper limit set value, delta o The work angle is shown.
6. The virtual synchronous generator control-based grid-connected inverter fault ride-through control method according to claim 5, characterized in that: in the step (6), the voltage and current double closed-loop control is carried out by the following formula to obtain the active shaft voltage instruction
And reactive axis voltage command
Wherein: l is v Is a virtual reactance, K p And K i Proportional and integral coefficients for the PI controller,
and
respectively giving an active voltage command and a reactive voltage command, U, for the grid-connected point control od And U oq Active voltage and reactive voltage are controlled for the grid-connected point respectively,
and
respectively giving an active current instruction and a reactive current instruction to the current inner loop, I sd And I sq Respectively, the active current and the reactive current of the current inner loop, I od And I oq Active current and reactive current are controlled for the grid-connected point respectively,
and
respectively an active voltage instruction and a reactive voltage instruction, L, at the output end of the grid-connected inverter f And C f Respectively a filter inductor and a filter capacitor.
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| CN116545003A (en) * | 2022-12-30 | 2023-08-04 | 中国电力科学研究院有限公司 | Electromechanical transient stability control method and system for active support type converter |
| CN116961116A (en) * | 2023-09-20 | 2023-10-27 | 四川大学 | Transient stability lifting method for grid-built inverter based on self-adaptive q-axis voltage feedback |
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| CN116545003A (en) * | 2022-12-30 | 2023-08-04 | 中国电力科学研究院有限公司 | Electromechanical transient stability control method and system for active support type converter |
| CN116545003B (en) * | 2022-12-30 | 2024-06-07 | 中国电力科学研究院有限公司 | Electromechanical transient stability control method and system for active support type converter |
| CN117096941A (en) * | 2023-07-13 | 2023-11-21 | 山东大学 | Network-structured new energy synchronous stable control method with self-adaptive voltage drop depth |
| CN117096941B (en) * | 2023-07-13 | 2024-03-26 | 山东大学 | Network-structured new energy synchronous stable control method with self-adaptive voltage drop depth |
| CN116961116A (en) * | 2023-09-20 | 2023-10-27 | 四川大学 | Transient stability lifting method for grid-built inverter based on self-adaptive q-axis voltage feedback |
| CN116961116B (en) * | 2023-09-20 | 2023-12-01 | 四川大学 | Transient stability lifting method for grid-built inverter based on self-adaptive q-axis voltage feedback |
| CN117411098A (en) * | 2023-10-16 | 2024-01-16 | 湖北工业大学 | Self-adaptive virtual admittance current limiting method based on voltage drop dynamic |
| CN117411098B (en) * | 2023-10-16 | 2024-04-19 | 湖北工业大学 | Self-adaptive virtual admittance current limiting method based on voltage drop dynamic |
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