CN115864453A - Interphase voltage balance control method and device and electronic equipment - Google Patents
Interphase voltage balance control method and device and electronic equipment Download PDFInfo
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Abstract
The invention discloses an inter-phase voltage balance control method, an inter-phase voltage balance control device and electronic equipment, wherein the method comprises the following steps: acquiring electrical measurement parameters of the photovoltaic grid-connected point, wherein the electrical measurement parameters comprise: a first instantaneous voltage measurement and a first instantaneous current measurement; determining photovoltaic self-adjusting parameters according to the electrical measurement parameters, wherein the photovoltaic self-adjusting parameters comprise an output voltage amplitude value, an output active instantaneous power, an output reactive instantaneous power and a reactive power instruction value; the grid-connected voltage of the photovoltaic grid-connected point is regulated for the first time according to the photovoltaic self-regulation parameters to obtain a first voltage regulation result; and when the first voltage regulation result does not meet the preset voltage balance condition, secondarily regulating the grid-connected voltage of the photovoltaic grid-connected point based on the inter-phase power flow control between the photovoltaic grid-connected point and the load node. According to the photovoltaic access point voltage unbalance self-adaptive dynamic regulation method, the voltage balance regulation strategies in two stages are set, the voltage unbalance self-adaptive dynamic regulation of the photovoltaic access point is realized, the photovoltaic residual installed capacity is effectively utilized, and the method is economical and efficient.
Description
Technical Field
The invention relates to the technical field of new energy power generation grid-connected control, in particular to a method and a device for controlling inter-phase voltage balance and electronic equipment.
Background
The distributed roof photovoltaic has good economic and social benefits and is widely popularized and applied across the country. However, with the access of a large number of single-phase photovoltaic power distribution networks, and the inherent characteristics of asymmetric three-phase parameters, large impedance-inductance ratio, obvious voltage and active coupling and the like of the power distribution networks, the problem of unbalanced three-phase voltage is more severe, and especially the problem of unbalanced voltage at the tail end of a distribution network line is more prominent. When the three phases of the distribution network run in an unbalanced manner, a large number of negative sequence components exist in the voltage, so that the loss of the equipment is increased, the equipment runs in an abnormal state, and the power supply quality is influenced.
In an existing single-phase distributed photovoltaic grid-connected power distribution system, the following technical means are generally adopted to solve the problem of unbalanced phase-to-phase voltage:
the purpose of adjusting the voltage unbalance degree is achieved by arranging an on-load voltage regulator, a group switching capacitor and a static reactive power compensation device, and the method has the technical problem that dynamic real-time adjustment of the voltage is difficult to realize through discrete variable control;
the method has the technical problems that the energy storage economy is poor, and the popularization and application are limited;
the voltage unbalance is adjusted by reducing the photovoltaic output, and the method has the technical problem that the photovoltaic output cannot be effectively utilized.
Disclosure of Invention
The invention provides a method and a device for controlling inter-phase voltage balance and electronic equipment.
According to an aspect of the present invention, there is provided an inter-phase voltage balance control method for a single-phase distributed photovoltaic grid-connected power distribution system, the method including the steps of:
acquiring electrical measurement parameters of the photovoltaic grid-connected point, wherein the electrical measurement parameters comprise: a first instantaneous voltage measurement and a first instantaneous current measurement;
determining photovoltaic self-adjusting parameters according to the electrical measurement parameters, wherein the photovoltaic self-adjusting parameters comprise output voltage amplitude values, output active instantaneous power, output reactive instantaneous power and reactive power instruction values;
carrying out primary regulation on the grid-connected voltage of the photovoltaic grid-connected point according to the photovoltaic self-regulation parameters to obtain a first voltage regulation result;
and when the first voltage regulation result does not meet the preset voltage balance condition, secondarily regulating the grid-connected voltage of the photovoltaic grid-connected point based on the inter-phase power flow control between the photovoltaic grid-connected point and the load node.
According to another aspect of the present invention, there is provided an inter-phase voltage balance control apparatus for an electrical distribution system under single-phase distributed photovoltaic access, comprising: the photovoltaic control module and the interphase power scheduling module; the photovoltaic control module includes: a parameter obtaining unit, configured to obtain an electrical measurement parameter of the photovoltaic grid-connected point, where the electrical measurement parameter includes: a first instantaneous voltage measurement and a first instantaneous current measurement; the parameter calculation unit is used for determining photovoltaic self-regulation parameters according to the electrical measurement parameters, and the photovoltaic self-regulation parameters comprise output voltage amplitude, output active instantaneous power, output reactive instantaneous power, residual reactive capacity and reactive power instructions; the voltage adjusting unit is used for adjusting the grid-connected voltage of the photovoltaic grid-connected point for the first time according to the photovoltaic self-adjusting parameters to obtain a first voltage adjusting result;
and when the first voltage regulation result does not meet the preset voltage balance condition, the interphase power scheduling module performs secondary regulation on the grid-connected voltage of the photovoltaic grid-connected point based on interphase power flow control between the photovoltaic grid-connected point and the load node.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the above-mentioned interphase voltage balance control method.
According to the technical scheme of the embodiment of the invention, through setting two stages of voltage balance adjustment strategies, in the first stage of voltage balance adjustment strategies, electrical measurement parameters of a photovoltaic grid-connected point are obtained, wherein the electrical measurement parameters comprise: a first instantaneous voltage measurement and a first instantaneous current measurement; determining photovoltaic self-adjusting parameters according to the electrical measurement parameters; the grid-connected voltage of the photovoltaic grid-connected point is regulated for the first time according to the photovoltaic self-regulation parameters to obtain a first voltage regulation result; when the first voltage regulation result does not meet the preset voltage balance condition, a second-stage voltage balance regulation strategy is executed, grid-connected voltage of the photovoltaic grid-connected point is regulated for the second time based on inter-phase power flow control between the photovoltaic grid-connected point and the load node, the problem of inter-phase voltage unbalance of the existing single-phase distributed photovoltaic grid-connected power distribution system is solved, self-adaptive dynamic regulation of voltage unbalance of the photovoltaic grid-connected point can be realized, residual photovoltaic installed capacity is effectively utilized, and the method is economical and efficient.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of an inter-phase voltage balance control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a single-phase distributed photovoltaic grid-connected power distribution system according to an embodiment of the present invention;
fig. 3 is a flowchart of an inter-phase voltage balance control method according to a first alternative embodiment of the present invention;
fig. 4 is a flowchart of an inter-phase voltage balance control method according to a second alternative embodiment of the present invention;
fig. 5 is a flowchart of a phase-to-phase voltage balance control method according to a third alternative embodiment of the first embodiment of the present invention;
fig. 6 is a flowchart of an inter-phase voltage balance control method according to a fourth alternative embodiment of the present invention;
fig. 7 is a flowchart of an inter-phase voltage balance control method according to a fifth alternative embodiment of the present invention;
fig. 8 is a control block diagram of a method for controlling voltage balance between phases according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an inter-phase voltage balance control apparatus according to a second embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electronic device for implementing the inter-phase voltage balance control method according to the embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a flowchart of an inter-phase voltage balance control method according to an embodiment of the present invention, where the method is applicable to a single-phase distributed photovoltaic grid-connected power distribution system, and the method may be executed by an inter-phase voltage balance control device, where the inter-phase voltage balance control device may be implemented in a form of hardware and/or software, and the inter-phase voltage balance control device may be configured in an electronic device.
Fig. 2 is a schematic structural diagram of a single-phase distributed photovoltaic grid-connected power distribution system according to an embodiment of the present invention.
As shown in fig. 2, the single-phase distributed photovoltaic is connected to the photovoltaic grid-connected Point a of the first low-voltage feeder L1 through the photovoltaic panel controller U1 and the photovoltaic grid-connected inverter DC/AC, the load node B of the second low-voltage feeder L2 is connected to the photovoltaic grid-connected Point a through a single-phase flexible Soft Switch (SOP), and the photovoltaic grid-connected Point a and the load node B form an interconnection node.
Optionally, the load node B comprises any one of: a load node B which is positioned on the same feeder line different phase with the photovoltaic grid-connected point A; or, a load node B on any phase of a feeder line different from the photovoltaic grid-connected point A; the load node B is positioned on one side of the feeder line close to the single-phase distributed photovoltaic; or the correlation degree between the load node B and the photovoltaic grid-connected point A for accessing the load and the power behavior characteristics is lower than a preset correlation degree threshold.
The photovoltaic grid-connected point A access load and power behavior characteristic correlation degree represents that: the correlation between the load and the degree of influence of a power supply (such as photovoltaic) on the electrical parameters of the photovoltaic grid-connected point a, the preset correlation threshold value can be obtained by calibration according to actual measurement data, and the specific numerical value is not limited.
Referring to fig. 1 and 2, the inter-phase voltage balance control method specifically includes the following steps:
s1: acquiring electrical measurement parameters of the photovoltaic grid-connected point A, wherein the electrical measurement parameters comprise: first instantaneous voltage measurement u a And a first instantaneous current measurement value i a 。
Wherein the electrical measurement parameters are obtained based on a down-sampling of the lighting conditions at any one time.
In this embodiment, a voltage detection unit and a current detection unit may be disposed at the single-phase distributed photovoltaic and photovoltaic grid-connected point a, and are used to collect a first instantaneous voltage measurement value u of the single-phase distributed photovoltaic output to the photovoltaic grid-connected point a a And a first instantaneous current measurement i a 。
S2: and determining photovoltaic self-adjusting parameters according to the electrical measurement parameters.
Wherein the photovoltaic self-regulation parameter comprises an output voltage amplitude u dc Photovoltaic output active instantaneous power P a Photovoltaic output reactive instantaneous power Q a Reactive power instruction value Q of voltage regulation participated in by single-phase distributed photovoltaic aref 。
In one embodiment, determining photovoltaic self-regulating parameters from electrical measurement parameters comprises: according to the first instantaneous voltage measurement value u a And a first instantaneous currentMeasured value i a Determining an output voltage amplitude u dc Photovoltaic output active instantaneous power P a And photovoltaic output reactive instantaneous power Q a (ii) a According to the first instantaneous voltage measurement value u a And photovoltaic output active instantaneous power P a Determining a reactive power command value Q aref 。
In particular, the first instantaneous voltage measurement u may be measured a Substituting the voltage amplitude calculation formula to calculate the photovoltaic output voltage amplitude u dc (ii) a The first instantaneous voltage measurement u can be obtained a And a first instantaneous current measurement i a Substituting into a power calculation formula to calculate the photovoltaic output active instantaneous power P a And photovoltaic output reactive instantaneous power Q a (ii) a Calculating a reactive power instruction value Q by establishing a reactive power instruction calculation rule and combining the installation capacity of the single-phase distributed photovoltaic aref 。
S3: and regulating the grid-connected voltage of the photovoltaic grid-connected point A for the first time according to the photovoltaic self-regulation parameters to obtain a first voltage regulation result.
In this embodiment, in the first-stage voltage balance adjustment strategy, a constant dc voltage and constant reactive power control mode may be adopted, which not only ensures the maximum photovoltaic output, but also participates in the voltage balance adjustment.
S4: and when the first voltage regulation result does not meet the preset voltage balance condition, secondarily regulating the grid-connected voltage of the photovoltaic grid-connected point A based on the inter-phase power flow control between the photovoltaic grid-connected point A and the load node B.
The preset voltage balance condition may be a condition parameter established based on any one or a combination of multiple phase voltage deviation thresholds, phase current deviation thresholds or phase power deviation thresholds. And if the photovoltaic output power reaches the maximum installation capacity, the first voltage regulation result still does not meet the preset voltage balance condition, for example, the actual inter-phase voltage deviation of the photovoltaic grid-connected point is greater than the inter-phase voltage deviation threshold, and then the voltage balance regulation strategy of the second stage is started.
In this embodiment, if the first voltage regulation result meets the preset voltage balance condition before the photovoltaic output power reaches the maximum installation capacity, the voltage balance regulation strategy in the second stage is not started.
Specifically, the inter-phase voltage balance control method adopts a first-stage voltage balance adjustment strategy and a second-stage voltage balance adjustment strategy to realize inter-phase voltage balance control. When the voltage unbalance of the photovoltaic grid-connected point A is detected, starting a first-stage voltage balance adjustment strategy, and adjusting reactive power absorbed or emitted by the grid-connected point by using the residual photovoltaic installed capacity on the premise of ensuring the maximum photovoltaic output under the current illumination to realize the function of adjusting the preliminary voltage unbalance; when the photovoltaic output power reaches the maximum capacity and the voltage imbalance of the photovoltaic grid-connected point is still detected, a second-stage voltage balance adjustment strategy is started, the exchange power of the photovoltaic grid-connected point and other feeders or other phase nodes of the same feeder is adjusted based on the flexible soft switch SOP, the voltages of the interconnection nodes at two ends of the flexible soft switch SOP are subjected to balance adjustment, and the flexibility and the rapidity of voltage balance control are greatly improved. By setting the voltage balance adjusting strategies in two stages, the problem of unbalanced phase voltage of the existing single-phase distributed photovoltaic grid-connected power distribution system is solved, self-adaptive dynamic adjustment of the voltage unbalance degree of a photovoltaic access point can be realized, the residual photovoltaic installed capacity is effectively utilized, and the method is economical and efficient.
Optionally, fig. 3 is a flowchart of a interphase voltage balance control method according to a first alternative embodiment provided in the first embodiment of the present invention, and on the basis of fig. 1, a specific implementation of a voltage balance adjustment strategy in the second stage is exemplarily shown.
As shown in fig. 3, the secondary regulation of the grid-connected voltage of the photovoltaic grid-connected point a based on the inter-phase power flow control between the photovoltaic grid-connected point a and the load node B includes the following steps:
s410: and adjusting the active power and the reactive power input or output by the photovoltaic grid connection point A based on the constant active power and reactive power control mode.
S420: and regulating the reactive power input or output by the load node B based on the constant direct-current voltage and the constant reactive power control mode.
In this embodiment, the single-phase flexible soft switch SOP adjusts the power absorbed or injected from the photovoltaic grid-connected point a through the converter, and adjusts the power injected or absorbed into or from the load node B through the converter.
Specifically, as shown in fig. 2, one end of the single-phase flexible soft switch SOP is connected to a grid-connected access point a whose voltage is greatly influenced by distributed photovoltaic output, and the other end is connected to another load node B whose voltage is less influenced by photovoltaic output and load variation. The power flow is exchanged between the two nodes through the single-phase flexible soft switch SOP, and when the voltage of the grid-connected access point A is higher than that of the load node B, the power of the grid-connected access point A flows to the load node B through the single-phase flexible soft switch SOP; on the contrary, when the voltage of the grid-connected access point A is lower than that of the load node B, the power of the load node B flows to the grid-connected access point A through the single-phase flexible soft switch SOP, and therefore the purpose of phase-to-phase voltage balance is achieved. Through setting different control targets, the voltage of the interconnection nodes at two ends of the soft switch SOP is balanced and adjusted, and the flexibility and the rapidity of voltage balance control are greatly improved.
In one embodiment, as shown in fig. 4, the adjusting of the active power and the reactive power input or output by the photovoltaic grid-connected point a based on the constant active and reactive power control mode includes the following steps:
s401: obtaining a first voltage amplitude U input or output by a photovoltaic grid-connected point A A And a second voltage amplitude U input or output to or from the load node B B 。
The amplitude of the voltage input by the photovoltaic grid-connected point A represents the amplitude of the instantaneous voltage of the single-phase flexible soft switch SOP injected into the photovoltaic grid-connected point A; the magnitude of the voltage output by the photovoltaic grid-connected point a represents the magnitude of the instantaneous voltage absorbed by the single-phase flexible soft switch SOP from the photovoltaic grid-connected point a.
S402: according to a first voltage amplitude U A And a second voltage amplitude U B Determining voltage amplitude reference value U of photovoltaic grid-connected point A Aref 。
S403: according to the voltage amplitude reference value U Aref And a first voltage amplitude U A Determining active power instruction value P of photovoltaic grid-connected point A Aref 。
Wherein the active power instruction value P Aref The method comprises the following steps: and the soft switch SOP absorbs the active power instruction value from the photovoltaic grid-connected point A and injects the active power instruction value into the load node B, or absorbs the active power instruction value from the load node B and injects the active power instruction value into the photovoltaic grid-connected point A.
S403: determining a reactive power instruction value Q of a photovoltaic grid-connected point A according to the coupling characteristics of voltage and active power and voltage and reactive power Aref 。
Wherein, the reactive power instruction value Q Aref The method comprises the following steps: and the soft switch SOP absorbs the reactive power instruction value of the load node B from the photovoltaic grid-connected point A and injects the reactive power instruction value into the load node B, or absorbs the reactive power instruction value of the photovoltaic grid-connected point A from the load node B and injects the reactive power instruction value into the photovoltaic grid-connected point A.
Preferably, considering that the coupling characteristic of the voltage and the active power in the power distribution network is stronger than the coupling characteristic of the voltage and the reactive power, in order to fully utilize the capacity of the flexible soft switch SOP to realize voltage regulation, a reactive power instruction value can be set to be equal to zero.
Specifically, the active power command value P Aref Satisfies the following formula one:
wherein, P Aref Representing an active power instruction value of the photovoltaic grid-connected point A; g PI Representing the transfer function of the PI controller, U Aref Representing a voltage amplitude reference value of the photovoltaic grid-connected point A; u shape A Instantaneous voltage measurement u representing photovoltaic grid-connected point A A Voltage amplitude of (d); u shape B Representing instantaneous voltage measurement u of load node B B The voltage amplitude of (a); u shape N Representing the nominal value of the amplitude of the phase voltage.
Specifically, the active power command P is shown in combination with equation one Aref Voltage amplitude U of photovoltaic grid connection point A A Transfer function G combined with PI controller PI Calculating to obtain a voltage amplitude reference value U of the photovoltaic grid-connected point A Aref According to the photovoltaic grid-connected point A and the negativeThe voltage of the charge node B exceeds the upper limit of 1.07U N And lower limit of 0.9U N Are obtained in different situations.
In an embodiment, as shown in fig. 5, the adjusting of the active power and the reactive power input or output by the photovoltaic grid-connected point a based on the constant active and reactive power control mode further includes the following steps:
s404: and acquiring an active instantaneous power measured value, a reactive instantaneous power measured value, a second instantaneous voltage measured value and a second instantaneous current measured value which are input or output to the photovoltaic grid-connected point A.
S405: and determining an active power intermediate regulating variable according to the active power instruction value and the active instantaneous power measured value.
S406: and determining a reactive power intermediate regulating variable according to the reactive power instruction value and the reactive instantaneous power measured value.
S407: and determining a current instruction value of the photovoltaic grid-connected point A according to the second instantaneous voltage measurement value, the active power intermediate regulating variable and the reactive power intermediate regulating variable.
In one embodiment, the instantaneous voltage measurement may be orthogonally decomposed based on a transfer function of a Second Order Generalized Integral (SOGI) to obtain a first orthogonal component and a second orthogonal component.
S408: and determining a converter control signal of the photovoltaic grid-connected point A according to the second instantaneous current measured value and the current instruction value.
S409: and adjusting the active power and the reactive power input or output by the photovoltaic grid-connected point A according to the converter control signal of the photovoltaic grid-connected point A.
The converter control signal can be a converter control pulse modulation signal.
Specifically, a converter control pulse modulation signal U of a photovoltaic grid-connected point A is accessed by a flexible soft switch SOP Am Satisfies the following formula two:
wherein,
respectively representing active power and reactive power intermediate regulation variables of the photovoltaic grid-connected point A; p Aref 、Q Aref Respectively an active power instruction and a reactive power instruction absorbed or injected from a photovoltaic grid-connected point A by the flexible soft switch SOP; p is A 、Q A Respectively are active and reactive instantaneous measurement values absorbed or injected from a photovoltaic grid connection point A by the soft switch SOP; i.e. i Aref A current instruction absorbed or injected from the photovoltaic grid-connected point A is taken as the flexible soft switch SOP; u. of A Is an instantaneous voltage measurement value of the photovoltaic grid-connected point A; u shape A Is u A The amplitude of (d); u. of Aα 、u Aβ Are each u A Passing through the SOGI transfer function G α 、G β A pair of orthogonal components is obtained; i.e. i A Is an instantaneous measure of the current absorbed or injected by the flexible soft switch SOP from or into the photovoltaic grid-connected point a.
In this embodiment, the soft switch SOP is connected to the converter control pulse modulation signal U of the load node B Bm Satisfies the formula three shown below:
wherein,
respectively representing active power and reactive power intermediate regulating variables of the load node B; p Bref 、Q Bref Respectively an active power instruction and a reactive power instruction absorbed or injected from a load node B by the soft switch SOP; p B 、Q B Respectively the active and reactive instantaneous measurement values absorbed or injected by the soft switch SOP from the load node B; i.e. i Bref A current command to sink or sink from the load node B for the soft switch SOP; u. of B Is an instantaneous voltage measurement of load node B; u shape B Is u B The amplitude of (d); u. of Bα 、u Bβ Are each u B Transmitted through the SOGITransfer function G α 、G β A pair of orthogonal components is obtained; i.e. i B Is an instantaneous measure of the current drawn or injected from the load node B by the soft switch SOP.
In an embodiment, as shown in fig. 6, the primary adjustment of the grid-connected voltage of the photovoltaic grid-connected point a according to the photovoltaic self-adjustment parameter includes:
s301: obtaining direct-current voltage instantaneous value U of photovoltaic grid-connected inverter dc 。
S302: according to the output reactive instantaneous power Q a And a reactive power command value Q aref And a DC voltage instantaneous value U dc And determining an active power self-regulation variable and a reactive power self-regulation variable.
In one embodiment, closed-loop regulation of the intermediate regulating variables of active and reactive power may be achieved based on a PI controller. If the transfer function of the PI controller is defined as G PI Then, the calculation rule of the active power self-regulation variable and the reactive power self-regulation variable satisfies the following formula four:
wherein,
representing an active power self-adjusting variable of the photovoltaic grid connection point A; />
Representing a reactive power self-adjusting variable of the photovoltaic grid-connected point A; u shape set And the voltage rated value of the direct current side of the photovoltaic grid-connected inverter is shown.
S303: and determining a current self-regulation instruction value according to the active power self-regulation variable, the reactive power self-regulation variable and the instantaneous voltage measurement value.
In one embodiment, the current command for the single-phase distributed photovoltaic output may be calculated based on a Second Order Generalized Integrator (SOGI). If the closed loop transfer function of the SOGI is defined as G α 、G β Then, the calculation rule of the current self-regulation instruction value satisfies the following formula five:
wherein i aref The current self-regulation instruction value of the photovoltaic grid connection point A is represented; u. of a A first instantaneous voltage measurement representing a photovoltaic grid-connected point a; u. of α 、u β Are each u a A pair of orthogonal components obtained after the SOGI; omega n Rated angular frequency for the grid; k represents an open loop scaling factor of the SOGI; s represents a variable.
S304: and carrying out proportional resonance control on the current self-regulation instruction value to obtain an inverter control signal.
In this embodiment, the inverter control signal is closed-loop regulated based on the PR controller, and the inverter control signal may be calculated by using a formula six as follows:
wherein G is PR Representing a closed loop transfer function of the PR controller; i.e. i a Representing the grid-connected current of the single-phase photovoltaic grid-connected inverter, namely a first instantaneous current measured value of a photovoltaic grid-connected point A;
is the cut-off frequency; k is a radical of p Is a proportionality coefficient; k is a radical of i Is an integral coefficient; s represents a variable.
S305: and carrying out closed-loop control on the photovoltaic grid-connected inverter according to the inverter control signal.
In one embodiment, as shown in fig. 7, the step of determining the reactive power command value according to the first instantaneous voltage measurement value and the output active instantaneous power includes the following steps:
s201: and acquiring the installation capacity and phase voltage amplitude rated values of the single-phase distributed photovoltaic.
S202: and determining a reactive power command value according to the first instantaneous voltage measurement value, the output active instantaneous power, the installation capacity and the phase voltage amplitude rated value.
In this embodiment, the closed-loop control of the reactive power command value may adopt a PI controller.
Specifically, reactive power instruction value Q of voltage regulation is participated in to single-phase distributed photovoltaic aref Calculated by the following formula seven:
wherein S is N Representing the installation capacity of the single distributed photovoltaic; g PI Representing the transfer function of the PI controller; u shape N Representing a phase voltage amplitude rating; u shape a Representing instantaneous voltage measurement u a Voltage amplitude of (d); p a Indicating the output active instantaneous power.
Fig. 8 is a control block diagram of a phase-to-phase voltage balance control method according to an embodiment of the present invention, where the control block diagram of the embodiment includes a single-phase photovoltaic and first-stage voltage unbalance control block diagram i, and an SOP and second-stage voltage unbalance control block diagram ii.
With reference to fig. 8 and formulas one to seven, during the first-stage voltage imbalance control, the remaining adjustable reactive power capacity is calculated based on the current active power output by the photovoltaic and the photovoltaic capacity information, and the voltage of the photovoltaic access point is suppressed or raised by absorbing or emitting reactive power adjustment, so that the uneconomic performance caused by a large amount of light waste is avoided, and the efficient utilization of the photovoltaic capacity is realized; the method is started under the condition that the first-stage regulation still cannot meet the requirement of the voltage balance degree, the first-stage voltage unbalance control is executed, the voltage unbalance degree regulation is further realized through the power transfer of the photovoltaic access point, and the method has the advantage of self-adaptive regulation of the interphase voltage balance degree.
Example two
Based on the same inventive concept, the second embodiment of the invention provides an inter-phase voltage balance control device, which is used for a power distribution system under single-phase distributed photovoltaic access.
Fig. 9 is a schematic structural diagram of an inter-phase voltage balance control apparatus according to a second embodiment of the present invention.
As shown in fig. 9, the single-phase distributed photovoltaic is connected to the photovoltaic grid-connected Point a of the first low-voltage feeder L1 through the photovoltaic panel controller U1 and the photovoltaic grid-connected inverter DC/AC, the load node B of the second low-voltage feeder L2 is connected to the photovoltaic grid-connected Point a through a single-phase flexible Soft Switch (SOP), and the photovoltaic grid-connected Point a and the load node B form an interconnection node.
As shown in fig. 9, the interphase voltage balance control device includes: photovoltaic control module 110 and interphase power scheduling module 120. The photovoltaic control module 110 is configured to execute a first-stage voltage balance adjustment strategy on the photovoltaic grid-connected access point; the inter-phase power scheduling module 120 is configured to execute a second-stage voltage balance adjustment strategy on the photovoltaic grid-connected access point.
As shown in fig. 9, the photovoltaic control module 110 includes:
the parameter obtaining unit 101 is configured to obtain an electrical measurement parameter of the photovoltaic grid-connected point a, where the electrical measurement parameter includes: a first instantaneous voltage measurement and a first instantaneous current measurement.
And the parameter calculation unit 102 is configured to determine photovoltaic self-adjustment parameters of the photovoltaic grid-connected point a according to the electrical measurement parameters, where the photovoltaic self-adjustment parameters include an output voltage amplitude, an output active instantaneous power, an output reactive instantaneous power, a residual reactive capacity, and a reactive power instruction.
And the voltage adjusting unit 103 is used for adjusting the grid-connected voltage of the photovoltaic grid-connected point A for the first time according to the photovoltaic self-adjusting parameters to obtain a first voltage adjusting result.
When the first voltage regulation result does not meet the preset voltage balance condition, the interphase power scheduling module 120 performs secondary regulation on the grid-connected voltage of the photovoltaic grid-connected point a based on interphase power flow control between the photovoltaic grid-connected point a and the load node B.
In one embodiment, the interphase power scheduling module 120 is configured to adjust active power and reactive power input or output by the photovoltaic grid-connected point based on a constant active and reactive power control mode; and regulating the reactive power input or output by the load node based on the constant direct-current voltage and the constant reactive power control mode.
In an embodiment, the interphase power scheduling module 120 is further configured to obtain a first voltage amplitude of the photovoltaic grid-connected point and a second voltage amplitude of the load node; determining a voltage amplitude reference value of the photovoltaic grid-connected point according to the first voltage amplitude and the second voltage amplitude; determining an active power instruction value of the photovoltaic grid-connected point according to the voltage amplitude reference value and the first voltage amplitude; and determining a reactive power instruction value of the photovoltaic grid connection point according to the coupling characteristics of the voltage and the active power and the voltage and the reactive power.
In one embodiment, the interphase power scheduling module 120 is further configured to obtain an active instantaneous power measurement value, a reactive instantaneous power measurement value, a second instantaneous voltage measurement value and a second instantaneous current measurement value input or output to the photovoltaic grid-connected point; determining an active power intermediate regulating variable according to the active power instruction value and the active instantaneous power measured value; determining a reactive power intermediate regulating variable according to the reactive power instruction value and the reactive instantaneous power measured value; determining a current instruction value of the photovoltaic grid-connected point according to the second instantaneous voltage measured value, the active power intermediate regulating variable and the reactive power intermediate regulating variable; and determining a converter control signal of the photovoltaic grid-connected point according to the second instantaneous current measured value and the current instruction value.
In one embodiment, the voltage regulating unit 103 is configured to obtain a dc voltage instantaneous value of the pv grid-connected inverter; determining an active power self-regulation variable and a reactive power self-regulation variable according to the output reactive instantaneous power, the reactive power instruction value and the direct-current voltage instantaneous value; determining a current self-regulation instruction value according to the active power self-regulation variable, the reactive power self-regulation variable and the instantaneous voltage measurement value; carrying out proportional resonance control on the current self-regulation instruction value to obtain an inverter control signal; and carrying out closed-loop control on the photovoltaic grid-connected inverter according to the inverter control signal.
In one embodiment, the parameter obtaining unit 101 is configured to determine an output voltage amplitude, an output active instantaneous power, and an output reactive instantaneous power according to the first instantaneous voltage measurement value and the first instantaneous current measurement value; and determining a reactive power instruction value according to the first instantaneous voltage measurement value and the output active instantaneous power.
In one embodiment, the parameter obtaining unit 101 is configured to obtain an installation capacity and a phase voltage amplitude rating of a single-phase distributed photovoltaic system; and determining a reactive power command value according to the first instantaneous voltage measurement value, the output active instantaneous power, the installation capacity and the phase voltage amplitude rated value.
In one embodiment, the load node comprises any one of: the load nodes are positioned on the same feeder line different phases with the photovoltaic grid-connected point; or, a load node on any phase of a feeder line different from the photovoltaic grid-connected point; the load node is positioned on one side of the feeder line close to the single-phase distributed photovoltaic; or the correlation degree of the load node and the photovoltaic grid-connected point access load and the power behavior characteristic is lower than a preset correlation degree threshold.
EXAMPLE III
Based on the same inventive concept, a third embodiment of the present invention provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the storage stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor, so that the at least one processor can execute the interphase voltage balance control method for the single-phase distributed photovoltaic power distribution system.
Fig. 10 is a schematic structural diagram of an electronic device 10 for implementing an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 10, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, and the like, wherein the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from a storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data necessary for the operation of the electronic apparatus 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
A number of components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, or the like; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
In some embodiments, the inter-phase voltage balance control method may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the inter-phase voltage balance control method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the inter-phase voltage balance control method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired result of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An inter-phase voltage balance control method is used for a single-phase distributed photovoltaic grid-connected power distribution system, and is characterized by comprising the following steps:
acquiring electrical measurement parameters of the photovoltaic grid-connected point, wherein the electrical measurement parameters comprise: a first instantaneous voltage measurement and a first instantaneous current measurement;
determining photovoltaic self-adjusting parameters according to the electrical measurement parameters, wherein the photovoltaic self-adjusting parameters comprise output voltage amplitude values, output active instantaneous power, output reactive instantaneous power and reactive power instruction values;
carrying out primary regulation on the grid-connected voltage of the photovoltaic grid-connected point according to the photovoltaic self-regulation parameters to obtain a first voltage regulation result;
and when the first voltage regulation result does not meet the preset voltage balance condition, secondarily regulating the grid-connected voltage of the photovoltaic grid-connected point based on the inter-phase power flow control between the photovoltaic grid-connected point and the load node.
2. The method according to claim 1, wherein the secondary regulation of the grid-connected voltage of the photovoltaic grid-connected point based on the inter-phase power flow control between the photovoltaic grid-connected point and a load node comprises:
the active power and the reactive power input or output by the photovoltaic grid connection point are adjusted based on a constant active power and reactive power control mode;
and adjusting the reactive power input or output by the load node based on the constant direct-current voltage and the constant reactive power control mode.
3. The method according to claim 2, wherein the adjusting the active power and the reactive power input or output by the photovoltaic grid-connected point based on the constant active and reactive power control mode comprises:
acquiring a first voltage amplitude of the photovoltaic grid-connected point and a second voltage amplitude of the load node;
determining a voltage amplitude reference value of the photovoltaic grid-connected point according to the first voltage amplitude and the second voltage amplitude;
determining an active power instruction value of the photovoltaic grid-connected point according to the voltage amplitude reference value and the first voltage amplitude;
and determining a reactive power instruction value of the photovoltaic grid-connected point according to the coupling characteristics of the voltage and the active power and the voltage and the reactive power.
4. The method according to claim 3, wherein the adjusting of the active power and the reactive power inputted or outputted by the photovoltaic grid-connected point based on the constant active and reactive power control mode further comprises:
acquiring an active instantaneous power measured value and a reactive instantaneous power measured value which are input or output to the photovoltaic grid-connected point, and a second instantaneous voltage measured value and a second instantaneous current measured value;
determining an active power intermediate regulating variable according to the active power instruction value and the active instantaneous power measured value;
determining a reactive power intermediate regulating variable according to the reactive power instruction value and the reactive instantaneous power measured value;
determining a current instruction value of the photovoltaic grid-connected point according to the second instantaneous voltage measurement value, the active power intermediate regulating variable and the reactive power intermediate regulating variable;
and determining a converter control signal of the photovoltaic grid-connected point according to the second instantaneous current measured value and the current instruction value.
5. The method according to claim 1, wherein once adjusting the grid-connected voltage of the photovoltaic grid-connected point according to the photovoltaic self-regulation parameter comprises:
acquiring a direct-current voltage instantaneous value of a photovoltaic grid-connected inverter;
determining an active power self-regulation variable and a reactive power self-regulation variable according to the output reactive instantaneous power, the reactive power instruction value and the direct current voltage instantaneous value;
determining a current self-regulation instruction value according to the active power self-regulation variable, the reactive power self-regulation variable and the instantaneous voltage measurement value;
carrying out proportional resonance control on the current self-adjusting instruction value to obtain an inverter control signal;
and performing closed-loop control on the photovoltaic grid-connected inverter according to the inverter control signal.
6. The method of claim 1, wherein determining photovoltaic self-regulating parameters from the electrical measurement parameters comprises:
determining the output voltage amplitude, the output active instantaneous power and the output reactive instantaneous power according to the first instantaneous voltage measurement value and the first instantaneous current measurement value;
and determining the reactive power instruction value according to the first instantaneous voltage measurement value and the output active instantaneous power.
7. The method of claim 6, wherein determining the reactive power command value based on the first instantaneous voltage measurement and the output active instantaneous power comprises:
obtaining the installation capacity and phase voltage amplitude rated values of the single-phase distributed photovoltaic;
and determining the reactive power command value according to the first instantaneous voltage measurement value, the output active instantaneous power, the installation capacity and the phase voltage amplitude rated value.
8. The method according to any of claims 1-7, wherein the load node comprises any of:
the load nodes are positioned on the same feeder line different phase with the photovoltaic grid-connected point; or,
a load node on any phase of a different feeder line from the photovoltaic grid-connected point;
wherein the load node is positioned on one side of the feeder line close to the single-phase distributed photovoltaic; or,
and the correlation degree of the load node with the photovoltaic grid-connected point access load and the power behavior characteristic is lower than a preset correlation degree threshold value.
9. An inter-phase voltage balance control device for a power distribution system under single-phase distributed photovoltaic access, comprising: the photovoltaic control module and the interphase power scheduling module;
the photovoltaic control module includes:
a parameter obtaining unit, configured to obtain an electrical measurement parameter of the photovoltaic grid-connected point, where the electrical measurement parameter includes: a first instantaneous voltage measurement and a first instantaneous current measurement;
the parameter calculation unit is used for determining photovoltaic self-regulation parameters according to the electrical measurement parameters, and the photovoltaic self-regulation parameters comprise output voltage amplitude, output active instantaneous power, output reactive instantaneous power, residual reactive capacity and reactive power instructions;
the voltage adjusting unit is used for adjusting the grid-connected voltage of the photovoltaic grid-connected point for the first time according to the photovoltaic self-adjusting parameters to obtain a first voltage adjusting result;
and when the first voltage regulation result does not meet the preset voltage balance condition, the interphase power scheduling module performs secondary regulation on the grid-connected voltage of the photovoltaic grid-connected point based on interphase power flow control between the photovoltaic grid-connected point and the load node.
10. An electronic device, characterized in that the electronic device comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the interphase voltage balance control method recited in any one of claims 1 to 8.
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