CN117277447A - Distributed photovoltaic reactive/active local regulation and control method and device - Google Patents
Distributed photovoltaic reactive/active local regulation and control method and device Download PDFInfo
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Abstract
The invention provides a distributed photovoltaic reactive/active local regulation and control method and device, and relates to the technical field of distributed photovoltaics, wherein the method comprises the following steps: the parallel capacitor bank of slow-acting equipment in the power distribution network is controlled in a centralized manner based on a global optimization model before the day, and an adjustment plan of the capacitor bank in the future day is formulated; and carrying out segmented reactive/active control on the distributed photovoltaic in the day according to the voltage condition of the distributed photovoltaic access points based on the regulation plan. According to the photovoltaic on-site control strategy for treating voltage deviation, the active and reactive power output of the photovoltaic is used as a regulating resource, the distribution of tide in a power distribution network is optimized, and the degree of unqualified voltage is reduced. And control strategies of different scenes are analyzed, and specific measures aiming at different voltage intervals are provided, so that the degree of voltage disqualification is further improved.
Description
Technical Field
The invention relates to the technical field of distributed photovoltaic, in particular to a distributed photovoltaic reactive/active local regulation and control method and device.
Background
With a large number of photovoltaic cells connected into the distribution grid, the power flow conditions in the distribution grid are quite different from those of a traditional power system. Because of the extremely large volatility and uncertainty of photovoltaic power generation, when the photovoltaic output is low, the load demand is difficult to meet, and certain node voltages are low or even lower voltage limit conditions occur. Therefore, for distributed photovoltaics in a power distribution network, a local control strategy is urgently needed to alleviate the problems of voltage failure and voltage out-of-limit.
Disclosure of Invention
In view of the above, the present invention provides a distributed photovoltaic reactive/active local regulation method and apparatus to solve at least one of the above-mentioned problems.
In order to achieve the above purpose, the present invention adopts the following scheme:
according to a first aspect of the present invention, there is provided a distributed photovoltaic reactive/active local regulation method, the method comprising: the parallel capacitor bank of slow-acting equipment in the power distribution network is controlled in a centralized manner based on a global optimization model before the day, and an adjustment plan of the capacitor bank in the future day is formulated; and carrying out segmented reactive/active control on the distributed photovoltaic in the day according to the voltage condition of the distributed photovoltaic access points based on the regulation plan.
As an embodiment of the present invention, before the step of controlling the distributed photovoltaic in situ in segments according to the voltage conditions of the distributed photovoltaic access points in the day based on the adjustment schedule in the above method, the method further includes: the voltage of the distributed photovoltaic access point is segmented and divided into a conventional section, a high voltage section and a low voltage section.
As an example of the present invention, the conventional interval in the above method is [0.98,1.04] p.u.; the high voltage interval is divided into a first high voltage interval, a second high voltage interval and a third high voltage interval, the first high voltage interval is (1.04, 1.05) p.u., the second high voltage interval is (1.05, 1.06) p.u., the third high voltage interval is (1.06) p.u., the low voltage interval is divided into a first low voltage interval, a second low voltage interval and a third low voltage interval, the first low voltage interval is [0.95,0.98 ], the second low voltage interval is [0.93,0.95 ], and the third low voltage interval is (0.93).
As an embodiment of the present invention, the method in which the step of controlling the distributed photovoltaic in-situ in segments according to the voltage conditions of the distributed photovoltaic access points in the day based on the adjustment schedule includes: when the voltage is in the conventional interval, the photovoltaic keeps the existing state unchanged; when the voltage is in the first low voltage interval, keeping the photovoltaic active power unchanged, outputting the capacitive reactive power by the photovoltaic on the basis of the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensuring that the power factor is more than or equal to 0.95; when the voltage is in the second low voltage interval, keeping the photovoltaic active power unchanged, performing capacitive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output the capacitive reactive power based on the maximum adjustable reactive power output and the adjustment coefficient of the photovoltaic inverter; when the voltage is in the third low voltage interval, keeping the photovoltaic active power unchanged, and under the constraint of apparent power, performing capacitive reactive power control according to reactive power and voltage sensitivity coefficients, and enabling the photovoltaic to output the capacitive reactive power based on the maximum adjustable reactive power output and the adjustment coefficient of the photovoltaic inverter; when the voltage is in the first high voltage interval, keeping the photovoltaic active power unchanged, outputting inductive reactive power by the photovoltaic based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensuring that the power factor is more than or equal to 0.95; when the voltage is in the second high voltage interval, keeping the photovoltaic active power unchanged, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power shortage and the adjustment coefficient of the photovoltaic inverter; and when the voltage is in the third high-voltage interval, keeping the photovoltaic active power unchanged, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power shortage and the adjustment coefficient of the photovoltaic inverter.
According to a second aspect of the present invention there is provided a distributed photovoltaic reactive/active local regulation device, the device comprising: the day-ahead optimization unit is used for intensively controlling the parallel capacitor banks of slow-acting equipment in the power distribution network based on a day-ahead global optimization model, and making an adjustment plan of the capacitor banks in the future day; and the local subsection control unit is used for carrying out reactive/active control on the distributed photovoltaic in a subsection mode according to the voltage condition of the distributed photovoltaic access points in the day based on the adjustment plan.
As an embodiment of the present invention, the above apparatus further includes: the voltage segmentation unit is used for segmenting the voltage of the distributed photovoltaic access point into a conventional section, a high voltage section and a low voltage section.
As an example of the present invention, the above conventional interval is [0.98,1.04] p.u.; the high voltage interval is divided into a first high voltage interval, a second high voltage interval and a third high voltage interval, the first high voltage interval is (1.04, 1.05) p.u., the second high voltage interval is (1.05, 1.06) p.u., the third high voltage interval is (1.06) p.u., the low voltage interval is divided into a first low voltage interval, a second low voltage interval and a third low voltage interval, the first low voltage interval is [0.95,0.98 ], the second low voltage interval is [0.93,0.95 ], and the third low voltage interval is (0.93).
As an embodiment of the present invention, the local segment control unit includes: the first control module is used for keeping the existing state of the photovoltaic unchanged when the voltage is in the conventional interval; the second control module is used for keeping the photovoltaic active power unchanged when the voltage is in the first low voltage interval, outputting the capacitive reactive power by the photovoltaic based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensuring that the power factor is more than or equal to 0.95; the third control module is used for keeping the photovoltaic active power unchanged when the voltage is in the second low-voltage interval, carrying out capacitive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output the capacitive reactive power based on the maximum adjustable reactive power output and the adjustment coefficient of the photovoltaic inverter; the fourth control module is used for keeping the photovoltaic active power unchanged when the voltage is in the third low voltage interval, performing capacitive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output the capacitive reactive power based on the maximum adjustable reactive power output and the adjustment coefficient of the photovoltaic inverter; the fifth control module is used for keeping the photovoltaic active power unchanged when the voltage is in the first high voltage interval, outputting inductive reactive power by the photovoltaic based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensuring that the power factor is more than or equal to 0.95; the sixth control module is used for keeping the photovoltaic active power unchanged when the voltage is in the second high-voltage interval, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power deficiency and the adjustment coefficient of the photovoltaic inverter; and the seventh control module is used for keeping the photovoltaic active power unchanged when the voltage is in the third high voltage interval, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power deficiency and the adjustment coefficient of the photovoltaic inverter.
According to a third aspect of the present invention there is provided an electronic device comprising a memory, a processor and a computer program stored on said memory and executable on said processor, the processor implementing the steps of the above method when executing said computer program.
According to a fourth aspect of the present invention there is provided a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above method.
According to a fifth aspect of the present invention there is provided a computer program product comprising computer programs/instructions which when executed by a processor implement the steps of the above method.
The distributed photovoltaic reactive/active local regulation and control method and device provided by the invention establish a photovoltaic local control strategy for treating voltage deviation, take the active and reactive output of the photovoltaic as regulation resources, optimize the distribution of tide in a power distribution network and reduce the degree of unqualified voltage. And control strategies of different scenes are analyzed, and specific measures aiming at different voltage intervals are provided, so that the degree of voltage disqualification is further improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic flow chart of a distributed photovoltaic reactive/active local regulation method provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of a distributed photovoltaic reactive/active local regulation method according to another embodiment of the present application;
fig. 3 is a schematic view of an operating range of a photovoltaic inverter provided in an embodiment of the present application;
fig. 4 is a schematic diagram of a process of the photovoltaic inverter participating in reactive voltage regulation in scenario one provided by the present embodiment;
fig. 5 is a schematic diagram of a process of participation of a photovoltaic inverter in reactive voltage regulation in scenario two provided in the present embodiment;
fig. 6 is a schematic structural diagram of a distributed photovoltaic reactive/active local regulation device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a distributed photovoltaic reactive/active local regulation device according to another embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a local segment control unit provided in an embodiment of the present application;
fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
Fig. 1 is a schematic flow chart of a distributed photovoltaic reactive/active local regulation method according to an embodiment of the present application, where the method includes the following steps:
step S101: and (3) based on a global optimization model before the day, the parallel capacitor bank of slow-motion equipment in the power distribution network is controlled in a centralized manner, and an adjustment plan of the capacitor bank in the future day is formulated.
In this embodiment, the day-ahead optimization in this step is voltage optimization in the first stage through parallel capacitors, and the specific content thereof is not the focus of the present application, and the specific content thereof may refer to the existing day-ahead optimization technical scheme.
Step S102: and carrying out segmented reactive/active control on the distributed photovoltaic in the day according to the voltage condition of the distributed photovoltaic access points based on the regulation plan.
In this embodiment, the regulation schedule refers to a control schedule of a capacitor bank, which is a type of reactive output device that is generally controlled in hours, so that in the day-ahead optimization, the capacitor is optimally controlled. The relation between the local sectional control and the regulation plan is that the action of the capacitor is optimized and controlled in the future, reactive power in the power distribution network is regulated in the first stage, and the local sectional control is to perform sectional voltage control according to the node voltage condition after the capacitor is regulated on the basis.
The distributed photovoltaic reactive/active local regulation method establishes a photovoltaic on-site control strategy for treating voltage deviation, takes active and reactive output of the photovoltaic as regulation resources, optimizes distribution of tide in a power distribution network, and reduces the degree of unqualified voltage.
Fig. 2 is a schematic flow chart of a distributed photovoltaic reactive/active local regulation method according to another embodiment of the present application, where the method includes the following steps:
step S201: and (3) based on a global optimization model before the day, the parallel capacitor bank of slow-motion equipment in the power distribution network is controlled in a centralized manner, and an adjustment plan of the capacitor bank in the future day is formulated.
Step S202: the voltage of the distributed photovoltaic access point is segmented and divided into a conventional section, a high voltage section and a low voltage section.
Preferably, the present embodiment further divides the high voltage section into a first high voltage section, a second high voltage section, and a third high voltage section, and the low voltage section is further divided into a first low voltage section, a second low voltage section, and a third low voltage section. The safe voltage operating range is [ 0.93-1.07 ], wherein [ 1-1.07 ] is a high voltage interval and [ 0.93-1 ] is a low voltage interval, and in this embodiment, in order to avoid unnecessary frequent adjustment, a conventional interval is specifically set, and the voltage interval in this embodiment is set as follows:
the conventional interval is [0.98,1.04] p.u.; the first high voltage interval is (1.04, 1.05) p.u., the second high voltage interval is (1.05, 1.06) p.u., the third high voltage interval is (1.06) p.u., the first low voltage interval is [0.95,0.98 ], the second low voltage interval is [0.93,0.95 ], and the third low voltage interval is (-, 0.93).
Step S203: and carrying out segmented reactive/active control on the distributed photovoltaic in the day according to the voltage condition of the distributed photovoltaic access points based on the regulation plan.
In this embodiment, the segment control of the distributed photovoltaic is not real-time, but is performed at intervals according to a preset time, for example, control of 15 minutes may be performed, that is, the distributed photovoltaic is controlled every 15 minutes.
Before describing a specific control method, the embodiment first describes a distributed photovoltaic three-stage reactive power regulation model: photovoltaic can emit both inductive and capacitive reactive power with continuity, but is limited by active output, capacity and maximum allowable power factor angle, the operating range of the photovoltaic inverter is shown in the sector of fig. 3.
The abscissa in fig. 3 is the active power of the photovoltaic inverter, and the ordinate is the reactive power of the photovoltaic inverter, phi max S is the maximum allowable power factor angle of the photovoltaic inverter max Is the capacity of the photovoltaic inverter. Each point in the sector area is a viable operating area for the photovoltaic inverter.
According to the initial power of the photovoltaic inverterSize, can comb into two scenes the process that photovoltaic dc-to-ac converter participated in voltage adjustment:
scene one: fig. 4 is a schematic diagram of a process of the photovoltaic inverter participating in reactive voltage regulation in scenario one provided in the present embodiment, fig. 4I.e. the power factor angle at which the photovoltaic inverter reaches the capacity-constrained operating point is not greater than the maximum power factor angle.
When the operation interval of the photovoltaic inverter is positioned on the OB line, the distributed photovoltaic device emits active power according to the requirement of maximum power tracking, and the emitted reactive power is zero.
And (3) setting the photovoltaic inverter to operate at a point C, increasing the reactive power of the photovoltaic inverter to operate in a CA section, wherein the active power of the photovoltaic inverter is kept unchanged at the moment, but the power factor angle is gradually increased, and the power factor is gradually reduced. With the increase of reactive power, the photovoltaic inverter reaches the maximum capacity at the point A, and the power factor angle of the photovoltaic inverter is phi 1 . At this stage, the photovoltaic inverter satisfies the following relationships of formulas (1), (2):
at AA 1 The reactive power output by the photovoltaic inverter continues to increase, the active power gradually decreases due to the constraint of the capacity of the photovoltaic inverter, and the inverter power factor gradually decreases until the minimum power factor. At this stage, the photovoltaic inverter satisfies the relationship of the following formula (3):
at A 1 And in the O stage, the photovoltaic inverter operates by adopting a constant power factor, the active power is reduced, and the reactive power is determined according to the active power and the maximum power factor angle. At this stage, the photovoltaic inverter satisfies the relationship of the following formula (4):
the four curves describe four possible states of the distributed photovoltaic in the scene, wherein the AA1 stage and the A1O stage are required to carry out photovoltaic active power reduction so as to meet the demand of reactive power increase.
Scene II: fig. 5 is a schematic diagram of a process of the photovoltaic inverter participating in reactive voltage regulation in scenario two provided in this embodiment, fig. 5I.e. the power factor angle at which the photovoltaic inverter reaches the capacity-constrained operating point is greater than the maximum power factor angle.
When the operation interval of the photovoltaic inverter is positioned on the OB line, the distributed photovoltaic device emits active power according to the requirement of maximum power tracking, and the emitted reactive power is zero.
Setting the photovoltaic inverter to operate at the point C, and increasing the reactive power of the photovoltaic inverter at the moment, namely, the photovoltaic inverter operates at CA 1 Segment, at this time, the active power of the photovoltaic inverter remains unchanged, but the power factor angle is gradually changedThe power factor gradually decreases with increasing power. As reactive power increases, the photovoltaic inverter is at a 1 The point reaches the maximum power factor, and the power factor angle of the photovoltaic inverter is phi max . At this stage, the photovoltaic inverter satisfies the relationship of the following formula (5):
at A 1 And in the O stage, the photovoltaic inverter operates by adopting a constant power factor, the active power is reduced, and the reactive power is determined according to the active power and the maximum power factor angle. At this stage, the photovoltaic inverter satisfies the relationship of the following formula (6):
the three curves describe three possible states of the distributed photovoltaic in the scene, wherein the A1O stage is required to cut the photovoltaic active power so as to meet the requirement of increasing reactive power.
In the adjusting process, as the active power emitted by the distributed photovoltaic is reduced, the light rejection rate of the distributed photovoltaic is increased, and the photovoltaic investor generates benefit loss, the adjustment of the active power of the distributed photovoltaic is reduced as much as possible, and when the voltage exceeds the upper limit and the reactive power adjustment of the inverter can not enable the voltage to return to the safe range, the reduction of the active power emitted by the photovoltaic can be considered.
In summary, the maximum reactive power output of the photovoltaic inverter can be expressed as formula (7):
wherein the first term in brackets is the maximum reactive power output calculated from the maximum power factor limit of the photovoltaic inverter and the second term is the maximum reactive power output calculated from the photovoltaic inverter capacity constraint.
The reactive power adjustment amount of the photovoltaic inverter can be calculated as follows (8):
wherein DeltaQ PV,max Representing reactive power adjustment quantity, Q of photovoltaic inverter PV The current reactive output value of the photovoltaic inverter is represented, U represents voltage, U min And U max Representing the lower and upper limits of the voltage, respectively. When the voltage is lower, the capacitive reactive power of the photovoltaic needs to be increased, and the voltage level is improved; conversely, reactive power needs to be absorbed and the voltage level is reduced.
The reactive output constraint of the photovoltaic inverter can be converted in an optimization model, and the reactive output constraint is represented by the following formula (9):
wherein P is PVi Representing the active power, Q of the ith photovoltaic inverter PVi Representing its reactive power, Q PVimax The reactive output upper limit of the ith photovoltaic inverter.
After the above description, the present embodiment further performs a segment control description on the voltage segment divided in step S202, which may be divided into the following seven control scenarios:
scene 1: when the voltage is in the conventional interval, i.e. when the voltage is at [0.98,1.04] p.u., the photovoltaic remains unchanged from the existing state.
Scene 2: when the voltage is in the first low voltage interval, that is, when the voltage is in [0.95,0.98 ] p.u., the photovoltaic active power is kept unchanged, the photovoltaic output capacitive reactive power is enabled to be based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and the power factor is ensured to be greater than or equal to 0.95, specifically, the photovoltaic output capacitive reactive power is enabled to be based on the following formula (10):
ΔQ 1 ＝k 1 α 1 Q pv,max (10)
Δq in the above 1 For the purpose ofCapacitive reactive power, k, output during regulation of distributed photovoltaics in a scene 1 To adjust the coefficient alpha 1 As reactive voltage sensitivity coefficient, Q PV,max Is the maximum adjustable reactive output of the photovoltaic inverter.
Scene 3: when the voltage is in the second low voltage interval, i.e. when the voltage is in [0.93,0.95) p.u., keeping the photovoltaic active power unchanged, performing capacitive reactive power control according to reactive power and voltage sensitivity coefficients under apparent power constraint, and enabling the photovoltaic to output the capacitive reactive power based on the maximum adjustable reactive power output and the adjustment coefficient of the photovoltaic inverter, specifically, enabling the photovoltaic to output the capacitive reactive power based on the following formula (11):
ΔQ 2 ＝k 2 α 2 Q pv,max (11)
Δq in the above 2 For the capacitive reactive power, k, output when the distributed photovoltaic participates in regulation in the scene 2 To adjust the coefficient alpha 2 As reactive voltage sensitivity coefficient, Q PV,max Is the maximum adjustable reactive output of the photovoltaic inverter.
Scene 4: when the voltage is in the third low voltage interval, namely when the voltage is in the range of (0.93) p.u., the photovoltaic active power is kept unchanged, under the apparent power constraint, the photovoltaic active power is controlled in a reactive and voltage sensitivity coefficient mode, the photovoltaic output capacitive reactive power is enabled based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, specifically, the photovoltaic output capacitive reactive power is enabled based on the following formula (12):
ΔQ 3 ＝k 3 α 3 Q pv,max (12)
Δq in the above 3 For the capacitive reactive power, k, output when the distributed photovoltaic participates in regulation in the scene 3 To adjust the coefficient alpha 3 As reactive voltage sensitivity coefficient, Q PV,max Is the maximum adjustable reactive output of the photovoltaic inverter.
Scene 5: when the voltage is in the first high voltage interval, namely when the voltage is in (1.04, 1.05) p.u., keeping the photovoltaic active power unchanged, enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensuring that the power factor is greater than or equal to 0.95, specifically enabling the photovoltaic to output inductive reactive power based on the following formula (13):
ΔQ 4 ＝k 4 α 4 Q pv,max (13)
Δq in the above 4 For the inductive reactive power, k, output when the distributed photovoltaic participates in regulation under the scene 4 To adjust the coefficient alpha 4 As reactive voltage sensitivity coefficient, Q PV,max Is the maximum adjustable reactive output of the photovoltaic inverter.
Scene 6: when the voltage is in the second high voltage interval, namely when the voltage is in (1.05, 1.06) p.u., keeping the photovoltaic active power unchanged, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power deficiency and the adjustment coefficient of the photovoltaic inverter, specifically, enabling the photovoltaic to output the inductive reactive power based on the following formula (14):
Δq in the above 5 For the inductive reactive power, k, output when the distributed photovoltaic participates in regulation under the scene 5 To adjust the coefficient alpha 5 For node voltage and reactive sensitivity coefficient, Q PV,max Maximum adjustable reactive output of photovoltaic inverter, Q dem And V is node voltage for the current reactive power shortage.
Scene 7: when the voltage is in the third high voltage interval, namely when the voltage is in (1.06 to) p.u., keeping the photovoltaic active power unchanged, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power deficiency and the adjustment coefficient of the photovoltaic inverter, specifically, enabling the photovoltaic to output the inductive reactive power based on the following formula (15):
Δq in the above 6 For the inductive reactive power, k, output when the distributed photovoltaic participates in regulation under the scene 6 To adjust the coefficient alpha 6 For node voltage and reactive sensitivity coefficient, Q PV,max Maximum adjustable reactive output of photovoltaic inverter, Q dem And V is node voltage for the current reactive power shortage.
The distributed photovoltaic reactive/active local regulation method establishes a photovoltaic on-site control strategy for treating voltage deviation, takes active and reactive output of the photovoltaic as regulation resources, optimizes distribution of tide in a power distribution network, and reduces the degree of unqualified voltage. And control strategies of different scenes are analyzed, and specific measures aiming at different voltage intervals are provided, so that the degree of voltage disqualification is further improved.
Fig. 6 is a schematic structural diagram of a distributed photovoltaic reactive/active local regulation device according to an embodiment of the present application, where the device includes: a day-ahead optimization unit 610 and a local segment control unit 620, wherein:
the day-ahead optimization unit 610 is configured to centrally control parallel capacitor banks of slow-motion devices in the power distribution network based on a day-ahead global optimization model, and make an adjustment plan for the capacitor banks in the future day.
The local segment control unit 620 is used for reactive/active control of the segments of the distributed photovoltaic according to the voltage situation of the distributed photovoltaic access points during the day based on the regulation schedule.
Preferably, as shown in fig. 7, the apparatus of this embodiment further includes: the voltage segmentation unit 630 is configured to segment the voltage of the distributed photovoltaic access point into a regular interval, a high voltage interval, and a low voltage interval.
Preferably, the above conventional interval is [0.98,1.04] p.u.; the high voltage interval is divided into a first high voltage interval, a second high voltage interval and a third high voltage interval, the first high voltage interval is (1.04, 1.05) p.u., the second high voltage interval is (1.05, 1.06) p.u., the third high voltage interval is (1.06) p.u., the low voltage interval is divided into a first low voltage interval, a second low voltage interval and a third low voltage interval, the first low voltage interval is [0.95,0.98 ], the second low voltage interval is [0.93,0.95 ], and the third low voltage interval is (0.93).
Preferably, as shown in fig. 8, the local segment control unit 620 of the present embodiment includes: a first control module 621, a second control module 622, a third control module 623, a fourth control module 624, a fifth control module 625, a sixth control module 626, a seventh control module 627, wherein:
a first control module 621 for keeping the photovoltaic in an existing state unchanged when the voltage is in the regular interval;
a second control module 622, configured to maintain the photovoltaic active power unchanged when the voltage is in the first low voltage range, and to output the photovoltaic active power based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and to ensure that the power factor is greater than or equal to 0.95;
a third control module 623 for maintaining the photovoltaic active power unchanged when the voltage is in the second low voltage interval, performing capacitive reactive power control according to reactive power and voltage sensitivity coefficients under apparent power constraints, and enabling the photovoltaic to output capacitive reactive power based on the maximum adjustable reactive power output and adjustment coefficients of the photovoltaic inverter;
a fourth control module 624, configured to keep the photovoltaic active power unchanged when the voltage is in the third low voltage interval, perform capacitive reactive power control according to reactive power and voltage sensitivity coefficient under apparent power constraint, and enable the photovoltaic to output capacitive reactive power based on the maximum adjustable reactive power output and adjustment coefficient of the photovoltaic inverter;
a fifth control module 625, configured to, when the voltage is in the first high voltage interval, keep the photovoltaic active power unchanged, enable the photovoltaic to output inductive reactive power based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensure that the power factor is greater than or equal to 0.95;
a sixth control module 626, configured to keep the photovoltaic active power unchanged when the voltage is in the second high voltage interval, perform inductive reactive power control according to reactive power and voltage sensitivity coefficients under apparent power constraint, and enable the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power deficiency and the adjustment coefficient of the photovoltaic inverter;
and a seventh control module 627, configured to keep the photovoltaic active power unchanged when the voltage is in the third high voltage interval, perform inductive reactive power control according to reactive power and voltage sensitivity coefficient under apparent power constraint, and enable the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power deficiency and the adjustment coefficient of the photovoltaic inverter.
The detailed description of each unit may be referred to the corresponding description in the foregoing method embodiment, and will not be repeated here.
The distributed photovoltaic reactive/active local regulation and control device provided by the invention establishes a photovoltaic on-site control strategy for treating voltage deviation, takes the active and reactive output of the photovoltaic as regulation resources, optimizes the distribution of tide in a power distribution network, and reduces the degree of unqualified voltage. And control strategies of different scenes are analyzed, and specific measures aiming at different voltage intervals are provided, so that the degree of voltage disqualification is further improved.
Fig. 9 is a schematic diagram of an electronic device according to an embodiment of the present invention. The electronic device shown in fig. 9 is a general-purpose data processing apparatus including a general-purpose computer hardware structure including at least a processor 801 and a memory 802. The processor 801 and the memory 802 are connected by a bus 803. The memory 802 is adapted to store one or more instructions or programs executable by the processor 801. The one or more instructions or programs are executed by the processor 801 to implement the steps in the transformation data processing equivalent adjustment method for electromagnetic transient models described above.
The processor 801 may be a separate microprocessor or a collection of one or more microprocessors. Thus, the processor 801 performs the process of processing data and controlling other devices by executing the commands stored in the memory 802, thereby executing the method flow of the embodiment of the present invention as described above. The bus 803 connects the above-described components together, while connecting the above-described components to a display controller 804 and a display device and an input/output (I/O) device 805. Input/output (I/O) devices 805 may be a mouse, keyboard, modem, network interface, touch input device, somatosensory input device, printer, and other devices known in the art. Typically, input/output (I/O) devices 805 are connected to the system through input/output (I/O) controllers 806.
The memory 802 may store software components such as an operating system, communication modules, interaction modules, and application programs, among others. Each of the modules and applications described above corresponds to a set of executable program instructions that perform one or more functions and methods described in the embodiments of the invention.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, is used for realizing the steps of the conversion data processing equivalent adjustment method of the electromagnetic transient model.
The embodiment of the invention also provides a computer program product, which comprises a computer program/instruction, wherein the computer program/instruction realizes the steps of the conversion data processing equivalent adjustment method of the upper electromagnetic transient model when being executed by a processor.
From the above, the method and the device for adjusting the equivalent of the conversion data processing of the electromagnetic transient model can quickly perfect the parameters of the electromagnetic transient model, do not need to manually check the parameters of each element, and save a great deal of time cost. The method is strong in universality, does not aim at specific electromechanical software, and can be suitable for data adjustment after different electromechanical software is converted into the same electromagnetic software. The simulation support can be used for model data adjustment of scenes such as large power grid planning and design, and the like, and provides simulation support for constraint factors and mechanism analysis of power transmission and reception capacity of a planning grid.
Preferred embodiments of the present invention are described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments which fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.
It will be appreciated by those skilled in the art that 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 is 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A distributed photovoltaic reactive/active local regulation method, characterized in that it comprises:
the parallel capacitor bank of slow-acting equipment in the power distribution network is controlled in a centralized manner based on a global optimization model before the day, and an adjustment plan of the capacitor bank in the future day is formulated;
and carrying out segmented reactive/active control on the distributed photovoltaic in the day according to the voltage condition of the distributed photovoltaic access points based on the regulation plan.
2. The distributed photovoltaic reactive/active local regulation method of claim 1, wherein the method further comprises, prior to the step of controlling the distributed photovoltaic in-situ in segments according to voltage conditions of the distributed photovoltaic access points on a daily basis based on the regulation schedule:
the voltage of the distributed photovoltaic access point is segmented and divided into a conventional section, a high voltage section and a low voltage section.
3. The distributed photovoltaic reactive/active local regulation method of claim 2, wherein the regular interval is [0.98,1.04] p.u.; the high voltage interval is divided into a first high voltage interval, a second high voltage interval and a third high voltage interval, the first high voltage interval is (1.04, 1.05) p.u., the second high voltage interval is (1.05, 1.06) p.u., the third high voltage interval is (1.06) p.u., the low voltage interval is divided into a first low voltage interval, a second low voltage interval and a third low voltage interval, the first low voltage interval is [0.95,0.98 ], the second low voltage interval is [0.93,0.95 ], and the third low voltage interval is (0.93).
4. The distributed photovoltaic reactive/active local regulation method of claim 3 wherein the step of sectionalizing the distributed photovoltaic in-situ from the voltage conditions of the distributed photovoltaic access points over the day based on the regulation schedule comprises:
when the voltage is in the conventional interval, the photovoltaic keeps the existing state unchanged;
when the voltage is in the first low voltage interval, keeping the photovoltaic active power unchanged, outputting the capacitive reactive power by the photovoltaic on the basis of the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensuring that the power factor is more than or equal to 0.95;
when the voltage is in the second low voltage interval, keeping the photovoltaic active power unchanged, performing capacitive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output the capacitive reactive power based on the maximum adjustable reactive power output and the adjustment coefficient of the photovoltaic inverter;
when the voltage is in the third low voltage interval, keeping the photovoltaic active power unchanged, and under the constraint of apparent power, performing capacitive reactive power control according to reactive power and voltage sensitivity coefficients, and enabling the photovoltaic to output the capacitive reactive power based on the maximum adjustable reactive power output and the adjustment coefficient of the photovoltaic inverter;
when the voltage is in the first high voltage interval, keeping the photovoltaic active power unchanged, outputting inductive reactive power by the photovoltaic based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensuring that the power factor is more than or equal to 0.95;
when the voltage is in the second high voltage interval, keeping the photovoltaic active power unchanged, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power shortage and the adjustment coefficient of the photovoltaic inverter;
and when the voltage is in the third high-voltage interval, keeping the photovoltaic active power unchanged, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power shortage and the adjustment coefficient of the photovoltaic inverter.
5. A distributed photovoltaic reactive/active local regulation device, characterized in that it comprises:
the day-ahead optimization unit is used for intensively controlling the parallel capacitor banks of slow-acting equipment in the power distribution network based on a day-ahead global optimization model, and making an adjustment plan of the capacitor banks in the future day;
and the local subsection control unit is used for carrying out reactive/active control on the distributed photovoltaic in a subsection mode according to the voltage condition of the distributed photovoltaic access points in the day based on the adjustment plan.
6. The distributed photovoltaic reactive/active local regulation device of claim 5, further comprising:
the voltage segmentation unit is used for segmenting the voltage of the distributed photovoltaic access point into a conventional section, a high voltage section and a low voltage section.
7. The distributed photovoltaic reactive/active local regulation device of claim 6 wherein the regular interval is [0.98,1.04] p.u.; the high voltage interval is divided into a first high voltage interval, a second high voltage interval and a third high voltage interval, the first high voltage interval is (1.04, 1.05) p.u., the second high voltage interval is (1.05, 1.06) p.u., the third high voltage interval is (1.06) p.u., the low voltage interval is divided into a first low voltage interval, a second low voltage interval and a third low voltage interval, the first low voltage interval is [0.95,0.98 ], the second low voltage interval is [0.93,0.95 ], and the third low voltage interval is (0.93).
8. The distributed photovoltaic reactive/active local regulation device of claim 7 wherein the local segment control unit comprises:
the first control module is used for keeping the existing state of the photovoltaic unchanged when the voltage is in the conventional interval;
the second control module is used for keeping the photovoltaic active power unchanged when the voltage is in the first low voltage interval, outputting the capacitive reactive power by the photovoltaic based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensuring that the power factor is more than or equal to 0.95;
the third control module is used for keeping the photovoltaic active power unchanged when the voltage is in the second low-voltage interval, carrying out capacitive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output the capacitive reactive power based on the maximum adjustable reactive power output and the adjustment coefficient of the photovoltaic inverter;
the fourth control module is used for keeping the photovoltaic active power unchanged when the voltage is in the third low voltage interval, performing capacitive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output the capacitive reactive power based on the maximum adjustable reactive power output and the adjustment coefficient of the photovoltaic inverter;
the fifth control module is used for keeping the photovoltaic active power unchanged when the voltage is in the first high voltage interval, outputting inductive reactive power by the photovoltaic based on the maximum adjustable reactive output and the adjustment coefficient of the photovoltaic inverter, and ensuring that the power factor is more than or equal to 0.95;
the sixth control module is used for keeping the photovoltaic active power unchanged when the voltage is in the second high-voltage interval, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power deficiency and the adjustment coefficient of the photovoltaic inverter;
and the seventh control module is used for keeping the photovoltaic active power unchanged when the voltage is in the third high voltage interval, performing inductive reactive power control according to reactive power and voltage sensitivity coefficients under the apparent power constraint, and enabling the photovoltaic to output inductive reactive power based on the maximum adjustable reactive power output, the current reactive power deficiency and the adjustment coefficient of the photovoltaic inverter.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of any of claims 1 to 4 when the computer program is executed by the processor.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 4.
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