CN115833241A - Network-building type photovoltaic power generation system control method and system considering active standby capacity - Google Patents
Network-building type photovoltaic power generation system control method and system considering active standby capacity Download PDFInfo
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Abstract
The invention discloses a control method and a system of a network-building type photovoltaic power generation system with active standby capacity considered, wherein the control method comprises the following steps: determining the duty ratio of the booster circuit based on the active standby output power; controlling a boost circuit based on a trigger pulse generated by the duty ratio of the boost circuit to determine the high-voltage side voltage of the boost converter; determining a voltage virtual phase angle of the potential in the grid-connected inverter based on the active standby output power and the boost converter high-voltage side voltage; determining a potential amplitude value in a grid-connected inverter based on the reactive power and grid-connected voltage of the photovoltaic power generation system; determining an internal potential reference value output signal under a three-phase static coordinate system based on the voltage virtual phase angle of the internal potential of the grid-connected inverter and the amplitude of the internal potential of the grid-connected inverter; and controlling the three-phase grid-connected inverter based on a driving signal generated by modulating the PWM generator according to the internal potential reference value output signal.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a control method and a control system of a network-type photovoltaic power generation system with active standby capacity taken into consideration.
Background
Under the trends of continuous depletion of fossil energy and more rigorous requirements on carbon emission, a power system which is dominated by a conventional synchronous power supply is gradually evolved to a power system which is dominated by asynchronous power supplies such as wind and light, and renewable energy power generation keeps a rapidly-developed situation in the world. Most of new energy power generation equipment is connected to the grid through a power electronic inverter control device, and the new problem is brought to the safe operation of the system while the grid connection requirement of the system is met. Compared with a synchronous generator, the new energy power supply is connected to the grid through the power electronic device and is in a decoupling operation state with the system, the frequency change of the system cannot be actively responded, and particularly, the photovoltaic power generation does not have a rotating object and does not have inertia essentially. The high-proportion new energy power generation is combined into a power grid, so that the inertia of the system is greatly weakened, and the low-inertia system is easy to have voltage and frequency stability problems, wherein the frequency problem is particularly prominent.
In addition, the new energy equipment based on inverter structure grid connection has the problem of weak voltage supporting capability, and the traditional new energy equipment such as photovoltaic equipment does not have the dynamic reactive power supporting capability similar to a conventional power supply, and has poor tolerance capability to system overvoltage. Particularly in an extra-high voltage direct current transmission end new energy collection area, during the direct current single commutation failure period, the transient overvoltage of a transmission end power grid is about 1.2 times of rated voltage, conventional units such as thermal power units and the like can still normally operate, but large-scale chain off-grid risks exist in new energy units such as photovoltaic units and the like, and therefore the improvement of the active supporting capacity of new energy equipment has important significance for guaranteeing the reliable operation of a novel power system.
The control modes of the current power electronic converter are mainly divided into a grid following type and a grid forming type, wherein a grid forming type control method is mainly applied to an energy storage inverter. At present, the photovoltaic inverters all adopt net-following type converters basically, a net-forming type converter control system is different from a current source type converter control system, the influence of a phase-locked loop is avoided due to the adoption of a self-synchronizing mode, meanwhile, the frequency and voltage support similar to a synchronous generator can be actively provided, the photovoltaic inverter is more suitable for running under a weak current network, and the photovoltaic inverter has a good development prospect. Therefore, a control method of the grid-type photovoltaic power generation system considering the active reserve capacity needs to be researched.
Disclosure of Invention
The invention provides a method and a system for controlling a network-forming type photovoltaic power generation system in consideration of active standby capacity, and aims to solve the problem of how to control the network-forming type photovoltaic power generation system.
In order to solve the above problems, according to an aspect of the present invention, there is provided a method of controlling a grid type photovoltaic power generation system in consideration of active reserve capacity, the method including:
in a boost converter control link of a photovoltaic power generation system, determining the duty ratio of a boost circuit based on active standby output power;
controlling a boost circuit based on a trigger pulse generated by the duty ratio of the boost circuit to determine the high-voltage side voltage of the boost converter;
in an active power outer loop control link, determining a voltage virtual phase angle of an internal potential of the grid-connected inverter based on the active standby output power and the boost converter high-voltage side voltage;
in a reactive power outer loop control link, determining an internal potential amplitude of a grid-connected inverter based on the reactive power and grid-connected voltage of the photovoltaic power generation system;
in a voltage and current double-loop control link, determining an internal potential reference value output signal under a three-phase static coordinate system based on a voltage virtual phase angle of the internal potential of the grid-connected inverter and an internal potential amplitude of the grid-connected inverter;
and controlling the three-phase grid-connected inverter based on a driving signal generated by modulating the PWM generator according to the internal potential reference value output signal.
Preferably, wherein the determining the boost circuit duty cycle based on the active standby output power comprises:
P cap ＝kP mppt ，
wherein d is the duty cycle of the booster circuit; k pdc 、K idc Is PI controller parameter, s is Laplace operator; p is dc The active power output value of the photovoltaic cell array is obtained; p cap Outputting power for the active standby; p mppt The maximum active power of the photovoltaic power generation system; k is the active standby coefficient.
Preferably, the controlling the boost circuit based on the trigger pulse generated by the duty cycle of the boost circuit to determine the boost converter high-side voltage comprises:
wherein d is the duty cycle of the booster circuit; u. of dc Boost converter high side voltage for boost; u. of pv Is the boost converter low side voltage.
Preferably, the determining a voltage virtual phase angle of a potential in the grid-connected inverter based on the active standby output power and the boost converter high-voltage side voltage includes:
j is virtual inertia simulating the traditional synchronous machine; d p Simulating a damping coefficient corresponding to a damping torque of a traditional synchronous machine; p v In order to simulate the mechanical power of the traditional synchronous machine; p is the measured output active power of the photovoltaic power generation system; p cap Outputting power for active standby; omega is the angular frequency of the internal potential of the grid-connected inverter; omega n At a nominal angular frequency, K pap 、K iap Is a PI controller parameter; s is a laplace operator; u. of dc-ref The reference value is a direct-current side voltage reference value of the grid-connected inverter; u. of dc The boost converter high-voltage side voltage is obtained; and theta is a voltage virtual phase angle of the potential in the grid-connected inverter.
Preferably, the determining the magnitude of the potential in the grid-connected inverter based on the reactive power of the photovoltaic power generation system and the grid-connected voltage includes:
wherein E is the potential amplitude in the grid-connected inverter; q ref Is a reactive power reference value; q is the measured output reactive power of the photovoltaic power generation system; k is a voltage integral coefficient; u is a grid-connected voltage effective value of the photovoltaic power generation system; u shape n The voltage is the rated voltage effective value of the grid-connected inverter; d q Is the ratio of the reactive power change in a steady state to the corresponding voltage amplitude change.
Preferably, the determining an internal potential reference value output signal in a three-phase static coordinate system based on the voltage virtual phase angle of the internal potential of the grid-connected inverter and the amplitude of the internal potential of the grid-connected inverter includes:
determining a current inner ring reference value based on the grid-connected inverter inner potential amplitude, wherein the method comprises the following steps:
determining an inverter internal potential based on the inner loop current value, including:
wherein e is d 、e q Dq axis components of the internal potential of the grid-connected inverter are respectively; u. of d 、u q Respectively obtaining dq axis components by park transformation of grid-connected voltage of the photovoltaic power generation system; i.e. i dref 、i qref Dq axis components of the inner loop current reference values, respectively; i.e. i d 、i q Dq-axis components of the inductor current, respectively; l is the inductance value of the filter circuit; k is pi 、K ii Is a PI controller parameter; s is a laplace operator; (ii) a i.e. i dg 、i qg Respectively are dq axis components of grid-connected current of the photovoltaic power generation system; u. of d 、u q Respectively obtaining dq axis components by park transformation of grid-connected voltage of the photovoltaic power generation system; u. of dref 、u qref Respective inner loop voltage reference value, u dref ＝E，u qref =0, e is the amplitude of the potential in the grid-connected inverter; c is the capacitance value of the filter circuit; k pu 、K iu Is the pi controller parameter;
and carrying out Clark conversion on the dq-axis component of the potential in the inverter based on the voltage virtual phase angle of the potential in the grid-connected inverter, and determining an internal potential reference value output signal under a three-phase static coordinate system.
According to another aspect of the present invention, there is provided a control system for a grid-type photovoltaic power generation system considering active reserve capacity, the system comprising:
the boost circuit duty ratio determining unit is used for determining the duty ratio of the boost circuit based on active standby output power in a boost converter control link of the photovoltaic power generation system;
the boost circuit control unit is used for controlling the boost circuit based on the trigger pulse generated by the duty ratio of the boost circuit so as to determine the high-voltage side voltage of the boost converter;
the voltage virtual phase angle determining unit is used for determining a voltage virtual phase angle of an internal potential of the grid-connected inverter based on the active standby output power and the boost converter high-voltage side voltage in an active power outer ring control link;
the internal potential amplitude determining unit is used for determining the internal potential amplitude of the grid-connected inverter based on the reactive power and the grid-connected voltage of the photovoltaic power generation system in the reactive power outer ring control link;
the internal potential reference value output signal determining unit is used for determining an internal potential reference value output signal under a three-phase static coordinate system based on a voltage virtual phase angle of the internal potential of the grid-connected inverter and an internal potential amplitude of the grid-connected inverter;
and the pulse width modulation unit is used for controlling the three-phase grid-connected inverter based on a driving signal generated by the pulse width modulation PWM generator according to the internal potential reference value output signal modulation.
Preferably, the step-up circuit duty ratio determining unit, which determines the step-up circuit duty ratio based on the active standby output power, includes:
P cap ＝kP mppt ，
wherein d is the duty cycle of the booster circuit; k pdc 、K idc Is a PI controller parameter, s is a Laplace operator; p dc The active power output value of the photovoltaic cell array is obtained; p is cap Outputting power for the active standby; p mppt The maximum active power of the photovoltaic power generation system; k is the active standby coefficient.
Preferably, the step-up circuit control unit, based on the trigger pulse generated by the step-up circuit duty ratio, controls the boost circuit to determine the boost converter high-voltage side voltage, and includes:
wherein d is the duty cycle of the booster circuit; u. of dc The boost converter high-voltage side voltage is obtained; u. of pv Is the boost converter low side voltage.
Preferably, the voltage virtual phase angle determining unit determines a voltage virtual phase angle of a potential in the grid-connected inverter based on the active standby output power and a boost converter high-voltage side voltage, and includes:
j is virtual inertia simulating the traditional synchronous machine; d p Simulating a damping coefficient corresponding to a damping torque of a traditional synchronous machine; p v In order to simulate the mechanical power of the traditional synchronous machine; p is measured output active power of the photovoltaic power generation system; p cap Outputting power for active standby; omega is the angular frequency of the internal potential of the grid-connected inverter; omega n At a nominal angular frequency, K pap 、K iap Is a PI controller parameter; s is a laplace operator; u. of dc-ref The reference value is a direct-current side voltage reference value of the grid-connected inverter; u. of dc The boost converter high-voltage side voltage is obtained; and theta is a voltage virtual phase angle of the potential in the grid-connected inverter.
Preferably, the internal potential amplitude determining unit determines the internal potential amplitude of the grid-connected inverter based on the reactive power of the photovoltaic power generation system and the grid-connected voltage, and includes:
wherein E is the potential amplitude in the grid-connected inverter; q ref Is a reactive power reference value; q is the measured output reactive power of the photovoltaic power generation system; k is a voltage integral coefficient; u is a grid-connected voltage effective value of the photovoltaic power generation system; u shape n The voltage is the rated voltage effective value of the grid-connected inverter;D q is the ratio of the reactive power change in a steady state to the corresponding voltage amplitude change.
Preferably, the internal potential reference value output signal determination unit determines an internal potential reference value output signal in a three-phase stationary coordinate system based on a virtual phase angle of a voltage of an internal potential of the grid-connected inverter and an amplitude of the internal potential of the grid-connected inverter, and includes:
determining a current inner ring reference value based on the potential amplitude in the grid-connected inverter, wherein the method comprises the following steps:
determining an inverter internal potential based on the inner loop current value, including:
wherein e is d 、e q Respectively are dq axis components of the potential in the grid-connected inverter; u. of d 、u q Respectively obtaining dq axis components by park transformation of grid-connected voltage of the photovoltaic power generation system; i.e. i dref 、i qref Dq-axis components of the inner loop current reference values, respectively; i.e. i d 、i q Dq-axis components of the inductor current, respectively; l is the inductance value of the filter circuit; k pi 、K ii Is a PI controller parameter; s is a laplace operator; (ii) a i.e. i dg 、i qg Respectively are dq axis components of grid-connected current of the photovoltaic power generation system; u. u d 、u q Respectively obtaining dq axis components by park transformation of grid-connected voltage of the photovoltaic power generation system; u. of dref 、u qref Respective inner loop voltage reference value, u dref ＝E，u qref =0, e is the amplitude of the potential in the grid-connected inverter; c is the capacitance value of the filter circuit; k pu 、K iu Is the pi controller parameter;
and carrying out Clark conversion on the dq-axis component of the potential in the inverter based on the voltage virtual phase angle of the potential in the grid-connected inverter, and determining an internal potential reference value output signal under a three-phase static coordinate system.
Based on another aspect of the invention, the invention provides a computer readable storage medium having stored thereon a computer program which, when being executed by a processor, realizes the steps of any one of the control methods of a grid-type photovoltaic power generation system taking into account active reserve capacity.
Based on another aspect of the present invention, the present invention provides an electronic device comprising:
the computer-readable storage medium described above; and
one or more processors to execute the program in the computer-readable storage medium.
The invention provides a network-building type photovoltaic power generation system control method and system considering active standby capacity, which comprises the following steps: in a boost converter control link of a photovoltaic power generation system, determining the duty ratio of a boost circuit based on active standby output power; controlling a boost circuit based on a trigger pulse generated by the duty ratio of the boost circuit to determine the high-voltage side voltage of the boost converter; in an active power outer loop control link, determining a voltage virtual phase angle of an internal potential of the grid-connected inverter based on the active standby output power and the boost converter high-voltage side voltage; in a reactive power outer loop control link, determining an internal potential amplitude of a grid-connected inverter based on the reactive power and grid-connected voltage of a photovoltaic power generation system; in a voltage and current double-loop control link, determining an internal potential reference value output signal under a three-phase static coordinate system based on a voltage virtual phase angle of the internal potential of the grid-connected inverter and an internal potential amplitude of the grid-connected inverter; and controlling the three-phase grid-connected inverter based on a driving signal generated by modulating the PWM generator according to the internal potential reference value output signal. The photovoltaic power generation system and the photovoltaic power generation method can solve the problem that a power grid lacks active supporting capacity after high-proportion photovoltaic access, can improve the safety and stability level of the photovoltaic power generation system, promote development and utilization of new energy resources such as photovoltaic and the like, and meanwhile can promote development of the photovoltaic industry.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flow chart of a method 100 for controlling a grid-type photovoltaic power generation system that takes into account active reserve capacity, according to an embodiment of the present invention;
fig. 2 is a primary topology circuit diagram of a grid-type photovoltaic power generation system considering active reserve capacity according to an embodiment of the present invention;
FIG. 3 is a block diagram of a boost converter control element according to an embodiment of the present invention;
fig. 4 is a block diagram of an active power control link according to an embodiment of the present invention;
FIG. 5 is a block diagram of a reactive power control link according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a power step response of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 7 is a grid-connected voltage waveform diagram of a photovoltaic power generation system according to an embodiment of the invention;
fig. 8 is a schematic diagram of a control system 900 of a grid-type photovoltaic power generation system considering active reserve capacity according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Aiming at the defects of the prior art, the invention provides a control method and a system of a network-forming type photovoltaic power generation system considering active reserve capacity, and inertia, frequency and voltage support similar to a synchronous generator can be actively provided by constructing a rotor motion equation and an excitation regulation system in a photovoltaic inverter. Meanwhile, an active deviation signal is introduced in a control link of the boost converter, so that maximum power tracking and active power standby operation can be realized, and the requirement of flexibly adjusting the active power output of the photovoltaic power generation system is met.
Fig. 1 is a flow chart of a method 100 for controlling a grid-type photovoltaic power generation system in consideration of active reserve capacity according to an embodiment of the present invention. As shown in fig. 1, the method for controlling a grid-type photovoltaic power generation system in consideration of active standby capacity according to the embodiment of the present invention can solve the problem that a power grid lacks active support capability after a high-proportion photovoltaic is connected, can improve the safety and stability level of the photovoltaic power generation system, and promote development and utilization of new energy resources such as photovoltaic, and meanwhile, the technology can promote development of the photovoltaic industry. In the method 100 for controlling a network-forming type photovoltaic power generation system considering active standby capacity according to the embodiment of the present invention, starting from step 101, in a boost converter control link of the photovoltaic power generation system, a duty ratio of a boost circuit is determined based on active standby output power.
Preferably, wherein the determining the boost circuit duty cycle based on the active standby output power comprises:
P cap ＝kP mppt ，
wherein d is the duty cycle of the booster circuit; k pdc 、K idc Is a PI controller parameter, s is a Laplace operator; p dc The active power output value of the photovoltaic cell array is obtained; p cap Outputting power for the active standby; p mppt The maximum active power of the photovoltaic power generation system; k is the active standby coefficient.
As shown in fig. 2, in the present invention, the photovoltaic power generation system is a photovoltaic power generation system without an energy storage unit, and the primary topology circuit includes: the photovoltaic grid-connected inverter comprises a photovoltaic cell array, a boost converter, a grid-connected inverter and an LC filter circuit. The control system includes: boost converter control link and grid-connected inverter control link.
In the boost converter control link of the photovoltaic power generation system, firstly, the maximum active power P of the photovoltaic power generation system is obtained by adopting a maximum power tracking algorithm based on the illumination intensity and the temperature mppt Based on the maximum active power P mppt Obtaining active standby output power P cap ：P cap ＝kP mppt And k is an active standby coefficient.
Then, based on the active standby output power P cap And photovoltaic cell array active power output P dc Determining a boost circuit duty cycle d, comprising:
wherein, K pdc 、K idc For the PI controller parameters, s is the laplacian.
In step 102, the boost circuit is controlled based on the trigger pulse generated by the boost circuit duty cycle to determine the boost converter high side voltage.
Preferably, the controlling the boost circuit based on the trigger pulse generated by the duty cycle of the boost circuit to determine the boost converter high-side voltage comprises:
wherein d is the duty cycle of the booster circuit; u. of dc The boost converter high-voltage side voltage is obtained; u. of pv Is the boost converter low side voltage.
In the present invention, a boost circuit is controlled based on a trigger pulse generated by a duty ratio d, and the boost circuit includes:
wherein u is dc For boost converter high side voltage, u pv Is the boost converter low side voltage.
In step 103, in the active power outer loop control link, a voltage virtual phase angle of an internal potential of the grid-connected inverter is determined based on the active standby output power and the boost converter high-voltage side voltage.
Preferably, the determining a voltage virtual phase angle of a potential in the grid-connected inverter based on the active standby output power and the boost converter high-voltage side voltage includes:
j is virtual inertia simulating the traditional synchronous machine; d p Simulating a damping coefficient corresponding to a damping torque of a traditional synchronous machine; p v In order to simulate the mechanical power of the traditional synchronous machine; p is measured output active power of the photovoltaic power generation system; p cap Outputting power for active standby; omega is the angular frequency of the internal potential of the grid-connected inverter; omega n At a nominal angular frequency, K pap 、K iap Is a PI controller parameter; s is a laplace operator; u. u dc-ref The reference value is a direct-current side voltage reference value of the grid-connected inverter; u. of dc The boost converter high-voltage side voltage is obtained; and theta is a voltage virtual phase angle of the potential in the grid-connected inverter.
In step 104, in the reactive power outer loop control link, the potential amplitude in the grid-connected inverter is determined based on the reactive power and the grid-connected voltage of the photovoltaic power generation system.
Preferably, the determining the magnitude of the potential in the grid-connected inverter based on the reactive power of the photovoltaic power generation system and the grid-connected voltage includes:
wherein E is a grid-connected inverterAn internal potential amplitude; q ref Is a reactive power reference value; q is the measured output reactive power of the photovoltaic power generation system; k is a voltage integral coefficient; u is a grid-connected voltage effective value of the photovoltaic power generation system; u shape n The voltage is the rated voltage effective value of the grid-connected inverter; d q Is the ratio of the reactive power change in a steady state to the corresponding voltage amplitude change.
In step 105, in a voltage and current double-loop control link, an internal potential reference value output signal under a three-phase static coordinate system is determined based on a voltage virtual phase angle of the internal potential of the grid-connected inverter and an internal potential amplitude of the grid-connected inverter.
Preferably, the determining an output signal of an internal potential reference value under a three-phase stationary coordinate system based on the virtual phase angle of the voltage of the internal potential of the grid-connected inverter and the amplitude of the internal potential of the grid-connected inverter comprises:
determining a current inner ring reference value based on the potential amplitude in the grid-connected inverter, wherein the method comprises the following steps:
determining an inverter internal potential based on the inner loop current value, including:
wherein e is d 、e q Dq axis components of the internal potential of the grid-connected inverter are respectively; u. of d 、u q Respectively obtaining dq axis components by park transformation of grid-connected voltage of the photovoltaic power generation system; i.e. i dref 、i qref Dq-axis components of the inner loop current reference values, respectively; i.e. i d 、i q Dq-axis components of the inductor current, respectively; l is the inductance value of the filter circuit; k pi 、K ii Is a PI controller parameter; s is a Laplace operator; (ii) a i.e. i dg 、i qg Respectively are dq axis components of grid-connected current of the photovoltaic power generation system; u. of d 、u q Respectively dq axis components obtained by park transformation of grid-connected voltage of the photovoltaic power generation system；u dref 、u qref Respective inner loop voltage reference value, u dref ＝E，u qref =0, e is the amplitude of the potential in the grid-connected inverter; c is the capacitance value of the filter circuit; k pu 、K iu Is the pi controller parameter;
and carrying out Clark conversion on the dq-axis component of the potential in the inverter based on the voltage virtual phase angle of the potential in the grid-connected inverter, and determining an internal potential reference value output signal under a three-phase static coordinate system.
In step 106, the three-phase grid-connected inverter is controlled based on the driving signal generated by the pulse width modulation PWM generator according to the internal potential reference value output signal modulation.
In the invention, the control link of the grid-connected inverter comprises active power outer loop control, reactive power outer loop control and voltage and current double closed loop control.
In the active power outer loop control link, based on the active standby output power P cap And the grid-connected inverter direct-current voltage u dc The method for acquiring the voltage virtual phase angle of the potential in the grid-connected inverter comprises the following steps:
wherein J is the virtual inertia of the simulated traditional synchronous machine, D p Simulating the damping coefficient, P, corresponding to the damping torque of a conventional synchronous machine v For simulating the mechanical power of a conventional synchronous machine, P is the measured output active power of the photovoltaic power generation system, P cap For active standby output power, omega is the angular frequency of the potential in the grid-connected inverter, omega n At a nominal angular frequency, K pap 、K iap For PI controller parameters, s is Laplace operator, u dc-ref Is a DC side voltage reference value u of the grid-connected inverter dc And theta is a measured value of the direct-current side voltage of the grid-connected inverter, and is a virtual phase angle of the potential in the grid-connected inverter.
In a reactive power outer loop control link, acquiring an internal potential amplitude of a grid-connected inverter based on the reactive power Q and the grid-connected voltage U of the photovoltaic power generation system, wherein the step comprises the following steps:
wherein Q is ref Is a reactive power reference value, Q is the measured output reactive power of the photovoltaic power generation system, K is a voltage integral coefficient, E is the internal potential amplitude of the grid-connected inverter, U is the grid-connected voltage effective value of the photovoltaic power generation system, and U is the voltage integral coefficient of the grid-connected inverter n For an effective value of the rated voltage of the grid-connected inverter, D q Is the ratio of the reactive power change in a steady state to the corresponding voltage amplitude change.
The calculation method of U comprises the following steps:
wherein u is d 、u q And the dq axis components are respectively obtained by park transformation of grid-connected voltage of the photovoltaic power generation system.
In a voltage and current double-loop control link, an internal potential reference value output signal under a three-phase static coordinate system is determined based on an internal potential amplitude and an internal potential virtual phase angle of a grid-connected inverter, and the method comprises the following steps:
in a voltage and current double-loop control link, determining a current inner loop reference value based on an inner loop voltage reference value:
wherein i dref 、i qref Dq-axis components, i, of the reference value of the inner loop current, respectively dg 、i qg Are respectively dq axis component u of grid-connected current of the photovoltaic power generation system d 、u q Respectively a dq axis component u obtained by park transformation of grid-connected voltage of the photovoltaic power generation system dref 、u qref The reference value of the inner ring voltage, C is the capacitance of the filter circuit, K pu 、K iu For the PI controller parameters, s is the laplacian.
In a voltage-current double-loop control link, determining an output signal of a potential reference value in an inverter based on the inner ring current reference value, wherein the method comprises the following steps:
wherein e is d 、e q Are respectively dq-axis components of the internal potential of the grid-connected inverter, u d 、u q Respectively a dq axis component i obtained by park transformation of grid-connected voltage of the photovoltaic power generation system dref 、i qref Dq-axis components, i, of the reference value of the inner loop current, respectively d 、i q Are dq-axis components of the inductor current, L is the inductance of the filter circuit, K pi 、K ii For the PI controller parameters, s is the laplacian operator.
And carrying out Clark conversion on the internal potential dq axis component of the grid-connected inverter based on the virtual phase angle of the internal potential of the grid-connected inverter to obtain an internal potential reference value output signal under a three-phase static coordinate system.
And finally, modulating an output signal of the internal potential reference value under the three-phase static coordinate system by carrier phase-shifting SPWM to generate a driving signal to control the three-phase grid-connected inverter.
The method improves the control system of the photovoltaic power generation equipment, so that the photovoltaic power generation equipment has the frequency and voltage regulation characteristics similar to those of a conventional synchronous unit, the problem that a power grid lacks active support capability after high-proportion photovoltaic access is solved, the safety and stability level of the photovoltaic power generation system can be improved, development and utilization of new energy resources such as photovoltaic and the like are promoted, and meanwhile, the technology can promote the development of the photovoltaic industry in China.
The embodiment takes a simulation system based on a PSCAD as an example, and describes a network-type photovoltaic power generation system control method and system implementation steps considering active standby capacity:
1. a primary topological circuit of the photovoltaic power generation system shown in fig. 2 is built on a PSCAD simulation platform and comprises a photovoltaic cell array, a boost converter, a grid-connected inverter and an LC filter circuit. A boost converter control link and a grid-connected inverter control link are sequentially established in a control link of a grid-structured photovoltaic power generation system considering active standby capacity.
2. In the control link of a boost converter of a photovoltaic power generation system, the maximum active power P of the photovoltaic power generation system is obtained by adopting a maximum power tracking algorithm based on illumination intensity and temperature mppt In the embodiment, the temperature of the photovoltaic cell is 28 ℃, and the illumination intensity of the photovoltaic cell is 1000W/m 2 Obtaining the maximum active power P of the photovoltaic power generation system by adopting a maximum power tracking algorithm mppt It was 0.5MW. Based on the maximum active power P mppt Obtaining active standby output power P cap The calculation method is as follows: p cap ＝kP mppt ；
Wherein k is an active standby coefficient.
Example k is 0.4 to give P cap And 0.2MW.
3. In a boost converter control link of a photovoltaic power generation system, a specific implementation method is shown in fig. 3. Will have active standby output power P cap And the active power output P of the photovoltaic cell array dc The difference is used as the input of the PI controller to obtain the duty ratio d of the boost converter, and the control equation is as follows:
wherein, K pdc 、K idc For the PI controller parameters, s is the laplacian operator.
Example K pdc Is 4,K pdc The concentration of the active carbon is 0.002%.
4. The boost circuit is controlled by the trigger pulse generated based on the duty ratio d, and the control equation is as follows:
wherein u is dc For boost converter high side voltage, u pv Is the boost converter low side voltage.
5. And in the control link of the grid-connected inverter, active power outer loop control, reactive power outer loop control and voltage and current double closed loop control are included.
6. In the active power outer loop control link, a specific implementation method is shown in fig. 4. The active power outer ring control link simulates a rotor mechanical equation of the synchronous generator, so that the photovoltaic inverter has the frequency and inertia response characteristics of the traditional synchronous generator. Will have active standby output power P cap The dynamic response deviation of the direct current voltage is used as virtual mechanical power of the inverter, the measured active power P output by the photovoltaic power generation system is used as virtual electromagnetic power, the difference between the two is subjected to an inertia control module and a damping control module to obtain the angular velocity of the inverter, the angular velocity is subjected to an integration link to obtain a potential virtual phase angle in the grid-connected inverter, and a control equation is as follows:
wherein J is the virtual inertia of the simulated traditional synchronous machine, D p Simulating the damping coefficient, P, corresponding to the damping torque of a conventional synchronous machine v For simulating the mechanical power of a conventional synchronous machine, P is the measured output active power of the photovoltaic power generation system, P cap For active standby output power, omega is the angular frequency of the potential in the grid-connected inverter, omega n At a nominal angular frequency, K pap 、K iap For PI controller parameters, s is Laplacian, u dc-ref Is a reference value of the DC side voltage of the grid-connected inverter u dc And theta is a measured value of the voltage on the direct current side of the grid-connected inverter, and is a virtual phase angle of the potential in the grid-connected inverter.
In the examples J is 100, dp is 0.0008, ω n 314.15926rad/s, u dc-ref Is 2kV, K pdc Is 0.5,K pdc Is 10.
7. In the reactive power outer loop control link, a specific implementation method is shown in fig. 5. The reactive control link simulates an excitation regulation system of a traditional synchronous machine, and obtains the potential amplitude in the grid-connected inverter based on the reactive power and grid-connected voltage of the photovoltaic power generation system, and the control equation is as follows:
wherein Q is ref Is a reactive power reference value, Q is the measured output reactive power of the photovoltaic power generation system, K is a voltage integral coefficient, E is an internal potential amplitude of the grid-connected inverter, U is an effective grid-connected voltage value of the photovoltaic power generation system, and U is a voltage integral coefficient n For an effective value of the rated voltage of the grid-connected inverter, D q Is the ratio of the reactive power change in a steady state to the corresponding voltage amplitude change.
Example Q ref Is 0, K is 10 q Is 100,U n Is 0.4kV.
The calculation method of U comprises the following steps:
wherein u is d 、u q And the dq axis components are respectively obtained by park transformation of grid-connected voltage of the photovoltaic power generation system.
8. In a voltage and current double-loop control link, an internal potential reference value under a three-phase static coordinate system is determined based on an internal potential amplitude and an internal potential virtual phase angle of a grid-connected inverter, and the method comprises the following steps:
in a voltage and current double-loop control link, a dq axis component obtained by park transformation of grid-connected voltage of the photovoltaic power generation system is subtracted from a voltage reference value, and then a current reference value i is obtained by calculation of a capacitive coupling term of a PI control link and a filter circuit dref 、i qref The control equation is as follows:
wherein i dref 、i qref Dq-axis components, i, of the reference value of the inner loop current, respectively dg 、i qg Are respectively dq axis component u of grid-connected current of the photovoltaic power generation system d 、u q Respectively a dq axis component u obtained by park transformation of grid-connected voltage of the photovoltaic power generation system dref 、u qref Voltage of inner ring respectivelyReference value, C is the capacitance of the filter circuit, K pu 、K iu For the PI controller parameters, s is the laplacian operator.
In the examples, C is 10uF pu Is 10,K iu Is 0.1.
In the voltage and current double-loop control link, the potential reference value vector in the grid-connected inverter is set to be in the d-axis direction and has u dref ＝E，u qref ＝0。
In a voltage and current double-loop control link, a dq axis component obtained by carrying out park transformation on inductive current is subtracted from a current reference value, and then an internal potential reference value is obtained by carrying out calculation on a P I control link and a filter circuit inductive coupling term, wherein a control equation is as follows:
wherein e is d 、e q Are respectively dq-axis components of the internal potential of the grid-connected inverter, u d 、u q Respectively a dq axis component, i, obtained by park transformation of grid-connected voltage of the photovoltaic power generation system dref 、i qref Dq-axis components, i, of the reference value of the inner loop current, respectively d 、i q Are dq-axis components of the inductor current, L is the inductance of the filter circuit, K pi 、K ii For the PI controller parameters, s is the laplacian operator.
In the examples L is 0.3mH pu Is 0.8, K iu Was 0.08.
And carrying out Clark conversion on the internal potential dq axis component of the grid-connected inverter based on the virtual phase angle of the internal potential of the grid-connected inverter to obtain an internal potential reference value output signal under a three-phase static coordinate system.
9. And modulating an output signal of the internal potential reference value under the three-phase static coordinate system by carrier phase-shifting SPWM to generate a driving signal to control the three-phase grid-connected inverter.
10. The system is simulated, and the simulation working conditions are as follows: in the initial state, the active power is 0.2MW, the reactive power is 0Mvar, an active step is applied at 3 seconds, and the active power is increased from 0.2MW to 0.4MW. Active power changes are shown in fig. 6, and system voltage waveforms are shown in fig. 7, so that it can be seen that the photovoltaic system outputs active power, an active instruction can be well tracked, and system stability is good.
Fig. 8 is a schematic structural diagram of a control system 900 of a grid-type photovoltaic power generation system considering active reserve capacity according to an embodiment of the present invention. As shown in fig. 8, a control system 900 of a grid-type photovoltaic power generation system considering active reserve capacity according to an embodiment of the present invention includes: a booster circuit duty ratio determination unit 901, a booster circuit control unit 902, a voltage virtual phase angle determination unit 903, an internal potential amplitude determination unit 904, an internal potential reference value output signal determination unit 905, and a pulse width modulation unit 906.
Preferably, the boost circuit duty ratio determining unit 901 is configured to determine, in a boost converter control link of the photovoltaic power generation system, a boost circuit duty ratio based on the active standby output power.
Preferably, the determining unit 901 for the duty cycle of the boost circuit based on the active standby output power determines the duty cycle of the boost circuit, including:
P cap ＝kP mppt ，
wherein d is the duty cycle of the booster circuit; k pdc 、K idc Is PI controller parameter, s is Laplace operator; p dc The active power output value of the photovoltaic cell array is obtained; p cap Outputting power for the active standby; p mppt The maximum active power of the photovoltaic power generation system; k is the active standby coefficient.
Preferably, the boost circuit control unit 902 is configured to control the boost circuit based on a trigger pulse generated by the duty cycle of the boost circuit to determine the boost converter high-side voltage.
Preferably, the step-up circuit control unit 902, controlling the boost circuit based on the trigger pulse generated by the duty cycle of the boost circuit to determine the boost converter high-voltage side voltage, includes:
wherein d is the duty cycle of the booster circuit; u. of dc The boost converter high-voltage side voltage is obtained; u. of pv Is the boost converter low side voltage.
Preferably, the voltage virtual phase angle determining unit 903 is configured to determine, in an active power outer loop control link, a voltage virtual phase angle of an internal potential of the grid-connected inverter based on the active standby output power and a high-voltage side voltage of the boost converter.
Preferably, the voltage virtual phase angle determining unit 903, which determines a voltage virtual phase angle of a potential in the grid-connected inverter based on the active standby output power and a boost converter high-voltage side voltage, includes:
j is virtual inertia simulating the traditional synchronous machine; d p Simulating a damping coefficient corresponding to a damping torque of a traditional synchronous machine; p is v In order to simulate the mechanical power of the traditional synchronous machine; p is measured output active power of the photovoltaic power generation system; p is cap Outputting power for active standby; omega is the angular frequency of the internal potential of the grid-connected inverter; omega n At a nominal angular frequency, K pap 、K iap Is a PI controller parameter; s is a laplace operator; u. u dc-ref The reference value is a direct-current side voltage reference value of the grid-connected inverter; u. u dc The boost converter high-voltage side voltage is obtained; and theta is a voltage virtual phase angle of the potential in the grid-connected inverter.
Preferably, the internal potential amplitude determining unit 904 is configured to determine, in the reactive power outer loop control link, an internal potential amplitude of the grid-connected inverter based on the reactive power of the photovoltaic power generation system and the grid-connected voltage.
Preferably, the determining unit 904 for the internal potential amplitude determines the internal potential amplitude of the grid-connected inverter based on the reactive power of the photovoltaic power generation system and the grid-connected voltage, and includes:
wherein E is the potential amplitude in the grid-connected inverter; q ref Is a reactive power reference value; q is the measured output reactive power of the photovoltaic power generation system; k is a voltage integral coefficient; u is a grid-connected voltage effective value of the photovoltaic power generation system; u shape n The voltage is the rated voltage effective value of the grid-connected inverter; d q Is the ratio of the reactive power change in a steady state to the corresponding voltage amplitude change.
Preferably, the internal potential reference value output signal determination unit 905 is configured to determine an internal potential reference value output signal in a three-phase stationary coordinate system based on a voltage virtual phase angle of the internal potential of the grid-connected inverter and an internal potential amplitude of the grid-connected inverter.
Preferably, the internal potential reference value output signal determining unit 905 determines an internal potential reference value output signal in a three-phase stationary coordinate system based on the virtual voltage phase angle of the internal potential of the grid-connected inverter and the amplitude of the internal potential of the grid-connected inverter, and includes:
determining a current inner ring reference value based on the grid-connected inverter inner potential amplitude, wherein the method comprises the following steps:
determining an inverter internal potential based on the inner loop current value, including:
wherein e is d 、e q Respectively are dq axis components of the potential in the grid-connected inverter; u. of d 、u q Respectively obtaining dq axis components by park transformation of grid-connected voltage of the photovoltaic power generation system; i all right angle dref 、i qref Are respectively an inner ringA dq-axis component of the current reference value; i.e. i d 、i q Dq-axis components of the inductor current, respectively; l is the inductance value of the filter circuit; k pi 、K ii Is a PI controller parameter; s is a laplace operator; (ii) a i.e. i dg 、i qg Respectively are dq axis components of grid-connected current of the photovoltaic power generation system; u. of d 、u q Respectively obtaining dq axis components by park transformation of grid-connected voltage of the photovoltaic power generation system; u. of dref 、u qref Respective inner loop voltage reference value, u dref ＝E，u qref =0, e is the amplitude of the potential in the grid-connected inverter; c is the capacitance value of the filter circuit; k pu 、K iu Is the pi controller parameter;
and carrying out Clark conversion on the dq-axis component of the potential in the inverter based on the voltage virtual phase angle of the potential in the grid-connected inverter, and determining an internal potential reference value output signal under a three-phase static coordinate system.
Preferably, the pulse width modulation unit 906 is configured to control the three-phase grid-connected inverter based on a driving signal generated by the pulse width modulation PWM generator according to the internal potential reference value output signal modulation.
The network-forming type photovoltaic power generation system control system 900 considering the active reserve capacity according to the embodiment of the present invention corresponds to the network-forming type photovoltaic power generation system control method 100 considering the active reserve capacity according to another embodiment of the present invention, and details thereof are not repeated herein.
Based on another aspect of the invention, the invention provides a computer readable storage medium having stored thereon a computer program which, when being executed by a processor, realizes the steps of any one of the control methods of a grid-type photovoltaic power generation system taking into account active reserve capacity.
Based on another aspect of the present invention, the present invention provides an electronic device comprising:
the computer-readable storage medium described above; and
one or more processors to execute the program in the computer-readable storage medium.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (14)
1. A method for controlling a grid-type photovoltaic power generation system in consideration of active reserve capacity, the method comprising:
in a boost converter control link of a photovoltaic power generation system, determining the duty ratio of a boost circuit based on active standby output power;
controlling a boost circuit based on a trigger pulse generated by the duty ratio of the boost circuit to determine the high-voltage side voltage of the boost converter;
in an active power outer loop control link, determining a voltage virtual phase angle of an internal potential of the grid-connected inverter based on the active standby output power and the boost converter high-voltage side voltage;
in a reactive power outer loop control link, determining an internal potential amplitude of a grid-connected inverter based on the reactive power and grid-connected voltage of a photovoltaic power generation system;
in a voltage and current double-loop control link, determining an internal potential reference value output signal under a three-phase static coordinate system based on a voltage virtual phase angle of the internal potential of the grid-connected inverter and an internal potential amplitude of the grid-connected inverter;
and controlling the three-phase grid-connected inverter based on a driving signal generated by modulating the PWM generator according to the internal potential reference value output signal.
2. The method of claim 1, wherein determining the boost circuit duty cycle based on the active standby output power comprises:
P cap ＝kP mppt ，
wherein d is the duty cycle of the booster circuit; k pdc 、K idc Is PI controller parameter, s is Laplace operator; p dc The active power output value of the photovoltaic cell array is obtained; p cap Outputting power for the active standby; p mppt The maximum active power of the photovoltaic power generation system; k is the active standby coefficient.
3. The method of claim 1, wherein the controlling the boost circuit to determine a boost converter high side voltage based on the trigger pulse generated by the boost circuit duty cycle comprises:
wherein d is the duty cycle of the booster circuit; u. of dc The boost converter high-voltage side voltage is obtained; u. of pv Is the boost converter low side voltage.
4. The method of claim 1, wherein determining a voltage virtual phase angle of a potential within a grid-tied inverter based on the active standby output power and a boost converter high side voltage comprises:
j is virtual inertia simulating the traditional synchronous machine; d p Simulating a damping coefficient corresponding to a damping torque of a traditional synchronous machine; p v In order to simulate the mechanical power of the traditional synchronous machine; p is measured output active power of the photovoltaic power generation system; p cap Outputting power for active standby; omega is the angular frequency of the internal potential of the grid-connected inverter; omega n At a nominal angular frequency, K pap 、K iap Is a PI controller parameter; s is a Laplace operator; u. of dc-ref The reference value is a direct-current side voltage reference value of the grid-connected inverter; u. of dc The boost converter high-voltage side voltage is obtained; and theta is a voltage virtual phase angle of the potential in the grid-connected inverter.
5. The method according to claim 1, wherein the determining the magnitude of the potential in the grid-connected inverter based on the reactive power of the photovoltaic power generation system and the grid-connected voltage comprises:
wherein E is the potential amplitude in the grid-connected inverter; q ref Is a reactive power reference value; q is the measured output reactive power of the photovoltaic power generation system; k is a voltage integral coefficient; u is a grid-connected voltage effective value of the photovoltaic power generation system; u shape n The voltage is the rated voltage effective value of the grid-connected inverter; d q Is the ratio of the reactive power change in a steady state to the corresponding voltage amplitude change.
6. The method according to claim 1, wherein the determining an internal potential reference value output signal in a three-phase static coordinate system based on the voltage virtual phase angle of the internal potential of the grid-connected inverter and the amplitude of the internal potential of the grid-connected inverter comprises:
determining a current inner ring reference value based on the grid-connected inverter inner potential amplitude, wherein the method comprises the following steps:
determining an inverter internal potential based on the inner loop current value, including:
wherein e is d 、e q Respectively are dq axis components of the potential in the grid-connected inverter; u. of d 、u q Respectively obtaining dq axis components by park transformation of grid-connected voltage of the photovoltaic power generation system; i.e. i dref 、i qref Dq-axis components of the inner loop current reference values, respectively; i.e. i d 、i q Dq-axis components of the inductor current, respectively; l is the inductance value of the filter circuit; k pi 、K ii Is a PI controller parameter; s is a laplace operator; (ii) a i.e. i dg 、i qg Respectively are dq axis components of grid-connected current of the photovoltaic power generation system; u. of d 、u q Dq axis components are respectively obtained by park transformation of grid-connected voltage of the photovoltaic power generation system; u. of dref 、u qref Respective inner loop voltage reference value, u dref ＝E，u qref =0, e is the amplitude of the potential in the grid-connected inverter; c is the capacitance value of the filter circuit; k pu 、K iu Is a PI controller parameter;
and carrying out Clark conversion on the dq-axis component of the potential in the inverter based on the voltage virtual phase angle of the potential in the grid-connected inverter, and determining an internal potential reference value output signal under a three-phase static coordinate system.
7. A grid-type photovoltaic power generation system control system taking into account active reserve capacity, the system comprising:
the boost circuit duty ratio determining unit is used for determining the duty ratio of the boost circuit based on active standby output power in a boost converter control link of the photovoltaic power generation system;
the boost circuit control unit is used for controlling the boost circuit based on the trigger pulse generated by the duty ratio of the boost circuit so as to determine the high-voltage side voltage of the boost converter;
the voltage virtual phase angle determining unit is used for determining a voltage virtual phase angle of an internal potential of the grid-connected inverter based on the active standby output power and the boost converter high-voltage side voltage in an active power outer ring control link;
the internal potential amplitude determining unit is used for determining the internal potential amplitude of the grid-connected inverter based on the reactive power and the grid-connected voltage of the photovoltaic power generation system in the reactive power outer ring control link;
the internal potential reference value output signal determining unit is used for determining an internal potential reference value output signal under a three-phase static coordinate system based on a voltage virtual phase angle of the internal potential of the grid-connected inverter and an internal potential amplitude of the grid-connected inverter;
and the pulse width modulation unit is used for controlling the three-phase grid-connected inverter based on a driving signal generated by the pulse width modulation PWM generator according to the internal potential reference value output signal modulation.
8. The system of claim 7, wherein the boost circuit duty cycle determination unit determines the boost circuit duty cycle based on the active standby output power, comprising:
P cap ＝kP mppt ，
wherein d is the duty cycle of the booster circuit; k pdc 、K idc Is a PI controller parameter, s is a Laplace operator; p dc As a photovoltaic cellArray active power output values; p cap Outputting power for the active standby; p mppt The maximum active power of the photovoltaic power generation system; k is the active standby coefficient.
9. The system of claim 7, wherein the boost circuit control unit controls the boost circuit to determine the boost converter high side voltage based on a trigger pulse generated by the boost circuit duty cycle, comprising:
wherein d is the duty cycle of the booster circuit; u. of dc The boost converter high-voltage side voltage is obtained; u. of pv Is the boost converter low side voltage.
10. The system of claim 7, wherein the voltage virtual phase angle determination unit determines a voltage virtual phase angle of a potential within a grid-tied inverter based on the active standby output power and a boost converter high side voltage, comprising:
j is virtual inertia simulating the traditional synchronous machine; d p Simulating a damping coefficient corresponding to a damping torque of a traditional synchronous machine; p is v In order to simulate the mechanical power of the traditional synchronous machine; p is measured output active power of the photovoltaic power generation system; p cap Outputting power for active standby; omega is the angular frequency of the internal potential of the grid-connected inverter; omega n At a nominal angular frequency, K pap 、K iap Is a PI controller parameter; s is a laplace operator; u. of dc-ref The reference value is the direct-current side voltage reference value of the grid-connected inverter; u. of dc Boost converter high side voltage for boost; theta is the voltage virtual phase of the potential in the grid-connected inverterAnd (4) an angle.
11. The system of claim 7, wherein the internal potential amplitude determination unit determines the grid-connected inverter internal potential amplitude based on the photovoltaic power generation system reactive power and the grid-connected voltage, and comprises:
wherein E is the potential amplitude in the grid-connected inverter; q ref Is a reactive power reference value; q is the measured output reactive power of the photovoltaic power generation system; k is a voltage integral coefficient; u is a grid-connected voltage effective value of the photovoltaic power generation system; u shape n The voltage is the rated voltage effective value of the grid-connected inverter; d q Is the ratio of the reactive power change in a steady state to the corresponding voltage amplitude change.
12. The system according to claim 7, wherein the internal potential reference value output signal determination unit determines an internal potential reference value output signal in a three-phase stationary coordinate system based on a voltage virtual phase angle of the grid-connected inverter internal potential and a grid-connected inverter internal potential amplitude, and includes:
determining a current inner ring reference value based on the potential amplitude in the grid-connected inverter, wherein the method comprises the following steps:
determining an inverter internal potential based on the inner loop current value, comprising:
wherein e is d 、e q Respectively are dq axis components of the potential in the grid-connected inverter; u. u d 、u q Are respectively a photovoltaic power generation systemA dq axis component obtained by carrying out park transformation on the grid voltage; i.e. i dref 、i qref Dq-axis components of the inner loop current reference values, respectively; i.e. i d 、i q Dq-axis components of the inductor current, respectively; l is the inductance value of the filter circuit; k pi 、K ii Is a PI controller parameter; s is a laplace operator; (ii) a i.e. i dg 、i qg Respectively are dq axis components of grid-connected current of the photovoltaic power generation system; u. of d 、u q Dq axis components are respectively obtained by park transformation of grid-connected voltage of the photovoltaic power generation system; u. of dref 、u qref Respective inner loop voltage reference value, u dref ＝E，u qref =0, e is the amplitude of the potential in the grid-connected inverter; c is the capacitance value of the filter circuit; k pu 、K iu Is a PI controller parameter;
and carrying out Clark conversion on the dq-axis component of the potential in the inverter based on the voltage virtual phase angle of the potential in the grid-connected inverter, and determining an internal potential reference value output signal under a three-phase static coordinate system.
13. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
14. An electronic device, comprising:
the computer-readable storage medium recited in claim 13; and
one or more processors to execute the program in the computer-readable storage medium.
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| CN117154765B (en) * | 2023-10-30 | 2024-03-12 | 国网江西省电力有限公司电力科学研究院 | Active standby grid-structured photovoltaic virtual synchronous generator control method and system |
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