CN110401201B - Reactive power configuration method, computer device and readable storage medium - Google Patents
Reactive power configuration method, computer device and readable storage medium Download PDFInfo
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- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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Abstract
The application relates to a reactive power configuration method, computer equipment and a readable storage medium, which are applied to a new energy station to supply power to a load center through a grid-connected point access converter station, wherein the method comprises the following steps: acquiring reactive power of the new energy station, voltage of a grid-connected point and a converter station transformation ratio, and inputting the obtained reactive power, voltage of the grid-connected point and the converter station transformation ratio into a well-established reactive power margin optimization model to obtain reactive power margin of the grid-connected point; obtaining the maximum value of the reactive margin, and calculating to obtain the target reactive power of the new energy station corresponding to the maximum value; and configuring the reactive power of the new energy station according to the target reactive power of the new energy station. The reactive margin comprises the sum of the reactive power margin and the voltage margin, so that the safety margin of a grid-connected point can be comprehensively considered to improve the running safety performance of a power grid system.
Description
Technical Field
The present application relates to the field of power system control technologies, and in particular, to a reactive power configuration method, a computer device, and a readable storage medium.
Background
The large-scale new energy power generation is remotely delivered to a load center through extra-high voltage flexible direct current transmission, and the future competitive development mode is provided. At present, large-scale new energy clusters are usually directly connected with an alternating current grid. Under the scene, the reactive voltage of the new energy cluster is optimized to ensure that the minimum network loss and the maximum safety margin are taken as optimization targets, and the combination of economy and safety is reflected.
Under the scene of flexible direct-output of large-scale new energy stations, reactive voltage optimization of the new energy stations only depends on power grid system topology, the distances between a current collecting line and a feeder line of the new energy cluster stations are short, the line voltage drop is small, and the system network loss change is small, so that the network loss is no longer the main target of reactive voltage optimization, and safety indexes such as a safe steady-state operation area of the converter station, dynamic reactive power margin and voltage margin of the converter station need to be considered. Currently, researchers also develop researches on reactive voltage optimization of the scene, but the researches have the problem that safety indexes are not considered sufficiently.
Disclosure of Invention
In view of the above, it is necessary to provide a reactive power configuration method, a computer device and a readable storage medium for solving the above technical problems.
The invention provides a reactive power configuration method, which is applied to a new energy station to supply power to a load center through a grid-connected point access converter station and comprises the following steps:
acquiring reactive power of the new energy station, voltage of a grid-connected point and a converter station transformation ratio, and inputting the obtained reactive power, voltage of the grid-connected point and the converter station transformation ratio into a well-established reactive power margin optimization model to obtain reactive power margin of the grid-connected point; wherein the reactive margin comprises a sum of a reactive power margin and a voltage margin;
obtaining the maximum value of the reactive margin, and calculating to obtain the target reactive power of the new energy station corresponding to the maximum value;
and configuring the reactive power of the new energy station according to the target reactive power.
In one embodiment, the reactive power margin is obtained by:
acquiring a safe steady-state operation area of active power and reactive power of the grid-connected point according to a power flow equation;
acquiring reactive power of the new energy station, voltage of a grid-connected point and a converter station transformation ratio, and inputting the trend equation to obtain current active power and current reactive power of the grid-connected point;
calculating the reactive power margin according to the current active power, the current reactive power and the safe steady-state operation area; and the reactive power margin is the minimum value of the boundary value difference between the current reactive power and the safe steady-state operation area under the current active power.
In one embodiment, the voltage margin is obtained by:
acquiring a safe steady-state operation area of active power and reactive power of the grid-connected point according to a power flow equation;
inputting the obtained reactive power of the new energy station, the voltage of a grid-connected point and the transformation ratio of the converter station into the power flow equation to obtain the current active power and the current reactive power of the grid-connected point;
acquiring the limit voltage of the grid-connected point according to the current active power, the current reactive power and the safe steady-state operation area; the limit voltage is the voltage of a grid-connected point when the current active power and the current reactive power are used as boundary values of the safe steady-state operation region;
calculating the voltage margin according to the current active power, the current reactive power and the limit voltage; and the voltage margin is the minimum value of the difference value between the grid-connected point voltage corresponding to the current active power and the current reactive power and the limit voltage.
In one embodiment, before the step of obtaining the reactive power of the new energy station, the voltage of the grid-connected point, and the transformer ratio of the converter station, and inputting the power flow equation to obtain the current active power and the current reactive power of the grid-connected point, the method further includes:
accessing the acquired new energy station into the topological relation of the converter station through a point of connection;
constructing an inter-node power flow equation and rated limit according to the topological relation; the rated limit is used for representing the maximum bearing capacity of each node.
In one embodiment, the step of obtaining the safe steady-state operation area of the grid-connected point active power and reactive power according to the power flow equation includes:
inputting the obtained grid-connected point voltage, the converter station transformation ratio and the grid-connected point active power and reactive power meeting the rated apparent power of the grid-connected point into the power flow equation to obtain the active power, reactive power and voltage of each node;
judging whether the active power, the reactive power and the voltage of each node meet the rated limit;
and if so, retaining the input active power and reactive power of the grid-connected point to obtain the safe steady-state operation area.
In one embodiment, the step of obtaining the limit voltage of the grid-connected point according to the current active power, the current reactive power and the safe steady-state operation area includes:
inputting prepared data into the power flow equation, and obtaining different safe steady-state operation areas under different grid-connected point voltages according to the rated limit; the preparation data comprise the acquired converter station voltage transformation ratio, the grid-connected point voltage meeting the rated limit, and the grid-connected point active power and reactive power meeting the rated apparent power of the grid-connected point;
judging whether the obtained boundary values of different safe steady-state operation areas comprise the current active power and the current reactive power;
and if so, taking the voltage of the grid-connected point corresponding to the current active power and the current reactive power as the limit voltage.
In one embodiment, the new energy site comprises at least two sub-sites, and the reactive power of the new energy site comprises the sum of the sub-reactive powers of the sub-sites; the step of configuring the reactive power of the new energy station according to the target reactive power comprises the following steps:
acquiring sub reactive power of the sub-stations;
inputting the sub reactive power into a well-established reactive power balance optimization model to obtain the target sub reactive power with balanced output of the sub-field station; the reactive power balance optimization model is a model comprising reactive power coordination factors of the sub-field stations, the reactive power coordination factors are used for representing reactive power output degrees of the sub-field stations, and the difference value between the reactive power coordination factors is smaller than or equal to a preset coordination factor difference value;
and configuring the sub reactive power of the sub-field station according to the target sub reactive power.
In one embodiment, the reactive coordination factor is a ratio of a first difference value and a second difference value, the first difference value is a difference between the sub-field station sub-reactive power and the sub-field station minimum reactive power, and the second difference value is a difference between the sub-field station maximum sub-reactive power and the sub-field station minimum reactive power;
and the difference value between the reactive coordination factors corresponding to any two sub-field stations is less than or equal to 0.05.
In another aspect, the present invention further provides a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of any one of the above methods when executing the computer program.
In another aspect, the present invention also provides a readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of any of the methods described above.
The reactive power configuration method is applied to a new energy station to supply power to a load center through a grid-connected point access converter station, and specifically comprises the steps of obtaining the reactive power of the new energy station, the grid-connected point voltage and the converter station voltage transformation ratio, inputting a well-established reactive margin optimization model, and obtaining the reactive margin of the grid-connected point, wherein the reactive margin comprises the sum of the reactive power margin and the voltage margin; obtaining the maximum value of the reactive margin, and calculating to obtain the reactive power of the new energy station corresponding to the maximum value of the reactive margin; and configuring the reactive power of the new energy station according to the reactive power of the new energy station. And realizing the maximum reactive power margin of the grid-connected point by configuring the reactive power of the new energy station, wherein the reactive power margin comprises the reactive power margin and the voltage margin, and comprehensively considering the safety margin of the grid-connected point so as to improve the running safety performance of a power grid system.
Drawings
FIG. 1 is a schematic flow chart of a method for configuring reactive power in one embodiment of the present invention;
FIG. 2 is a schematic diagram of a topology of a new energy grid system;
FIG. 3 is a flowchart illustrating a method for obtaining a reactive power margin of a grid-connected point according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a grid-connected point reactive power margin solution;
FIG. 5 is a flowchart illustrating a method for obtaining a voltage margin of a grid-connected point according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a grid-connected point voltage margin solution;
FIG. 7 is a flow chart illustrating a method for obtaining a power flow equation according to an embodiment of the present invention;
FIG. 8 is a schematic flow chart diagram illustrating a method for operating a safe steady state operating region in one embodiment of the present invention;
FIG. 9 is a schematic flow chart of a method for obtaining current active power and reactive power of a grid-connected point according to an embodiment of the present invention;
fig. 10 is a schematic flow chart of a method for configuring reactive power of a new energy station according to target reactive power of the new energy station in an embodiment provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that the execution main body of the method embodiments described below may be a computer device, and the computer device may implement some or all of the steps described below by software, hardware, or a combination of software and hardware. The computer device may be a server, a desktop, a personal digital assistant, other terminal devices such as a tablet computer, a mobile phone, and the like, or a cloud or a remote server, and the specific form of the computer device is not limited in the embodiments of the present application. The following method embodiments are described by taking the execution subject as the computer device as an example.
Referring to fig. 1, a schematic flow chart of a reactive power configuration method according to an embodiment of the present invention is shown. The method is applied to a scene that a new energy station accesses a converter station through a point-to-point network to supply power to a load center, and comprises the following steps:
step S11: and acquiring the reactive power of the new energy station, the voltage of a grid-connected point and the transformation ratio of the converter station, and inputting the obtained reactive power, voltage and transformation ratio into a well-established reactive power margin optimization model to obtain the reactive power margin of the grid-connected point.
The method is applied to an application scenario in which a new energy power grid system supplies power to a load center, wherein the new energy power grid system comprises a new energy station, a converter station transformer and a converter station, and is specifically shown in fig. 2.
Specifically, the optimization target of the reactive margin optimization model is the reactive margin F of the grid-connected point, and the reactive margin F comprises a reactive power margin FQAnd a voltage margin FU。
Specifically, the reactive margin F includes a reactive power margin FQAnd a voltage margin FUAnd the reactive margin optimization model meets the following formula:
F＝αFQ+(1-α)FU
wherein, alpha is a weight coefficient, and the reactive power margin FQAnd a voltage margin FUIs about the voltage U of the grid-connected pointpccConverter station transformation ratio k and grid-connected point active power PccAnd reactive power QccAs a function of (c).
Specifically, the grid-connected point voltage U obtained by the computer equipmentpccAnd under the condition that the transformation ratio k of the converter station is constant, acquiring reactive power Q of a plurality of new energy field stationsSInput solution reactive power margin FQIn function of (a), a plurality of reactive power margins F are obtainedQSaid plurality of reactive power margins FQForming a reactive power margin set, and corresponding the maximum value in the reactive power margin set to the reactive power Q of the new energy stationSAs target reactive power QSref。
The computer equipment obtains the reactive power Q of the new energy stationSAnd under the condition that the transformation ratio k of the converter station is constant, acquiring a plurality of grid-connected point voltages UpccInput solution voltage margin FUIn a function of (a), a plurality of voltage margins F are obtainedUThe plurality of voltage margins FUA set of voltage margins is formed.
Step S12: and obtaining the maximum value of the reactive margin, and calculating to obtain the target reactive power of the new energy station corresponding to the maximum value.
The reactive power configuration method aims to maximize the reactive margin F of the grid-connected point so as to increase the reactive power regulation capacity of the new energy station.
Specifically, the computer device obtains the maximum value of the reactive power margin F, and the maximum value of the reactive power margin F can be obtained by obtaining the reactive power margin FQAnd said reactive power margin FQThe maximum corresponding voltage margin FUIs obtained as the maximum value of (a).
Specifically, the computer device obtains the reactive power margin F in the reactive power margin setQMaximum value ofCalculating the reactive power margin F by the function for calculating the reactive power marginQAt the maximum value of (2), the corresponding reactive power Q of the new energy stationSAs the target reactive power QSref(ii) a In the new energy station reactive power QSFor the target reactive power QSrefAnd under the condition that the converter station transformation ratio k is constant, the computer equipment acquires the voltage margin F in the voltage margin setUFor the reactive power margin FQAnd the voltage margin FUThe maximum value of the reactive margin F is obtained by summation.
Step S13: and configuring the reactive power of the new energy station according to the target reactive power.
Wherein the target reactive power QSrefThe reactive power Q of the new energy station corresponding to the maximum value of the reactive margin FSSo that the computer device is dependent on said target reactive power QSrefTo the reactive power Q of the new energy stationSAnd inputting reactive power, so that the reactive margin F of the grid-connected point is maximized.
In this embodiment, a reactive power margin and a voltage margin of the grid-connected point are comprehensively considered through a reactive power margin optimization model, so that a target reactive power of the new energy station when the reactive power margin of the grid-connected point is the maximum is obtained, and then the reactive power of the new energy station is input according to the target reactive power, so that the reactive power margin of the grid-connected point is the maximum, and the safety performance of the operation of the power grid system is integrally improved.
In one embodiment, as shown in fig. 3, in step S11, a reactive power margin F of the grid-connected point is obtainedQThe method comprises the following steps:
step S111: and acquiring a safe steady-state operation area of the active power and the reactive power of the grid-connected point according to a power flow equation.
And the power flow equation is a function relation of power balance at each node bus in the new energy power grid system.
Specifically, the power flow equation of each node satisfies the following formula:
wherein the active power P of each nodeiReactive power QiAnd a voltage UiThe following power flow constraints are satisfied:
Umin≤Ui≤Umax
Pmin≤Pi≤Pmax
Qmin≤Qi≤Qmax
the specific meaning of the above formula is the same as that in the prior art and is not described herein again.
Specifically, the safe steady-state operation area is that the rated apparent power S of the grid-connected point is metccUnder the condition of (2), the computer equipment obtains the active power P of each node according to the power flow equationiReactive power QiAnd a voltage UiAnd obtaining the physical quantity of each node such as active power P through judgmentiReactive power QiAnd a voltage UiWhether the rated limit of each node is met or not is waited, and then the active power P of the grid-connected point is further judgedccAnd reactive power QccAnd performing trial and error screening to obtain the safe steady-state operation area.
Wherein, in the safe steady-state operation area, the computer equipment selects different grid-connected point active power PccAnd reactive power QccInputting the power flow equation to obtain the reactive power Q of a plurality of new energy stationssReactive power Q of the plurality of new energy stationssAnd forming a reactive power set of the new energy station.
Step S112: and inputting the obtained reactive power of the new energy station, the voltage of the grid-connected point and the converter station transformation ratio into the power flow equation to obtain the current active power and the current reactive power of the grid-connected point.
Wherein, the obtained reactive power Q of the new energy stationsThe reactive power is obtained from the reactive power set of the new energy station.
Step S113: and calculating the reactive power margin according to the current active power, the current reactive power and the safe steady-state operation area.
And the reactive power margin is the minimum value of the boundary value difference between the current reactive power and the safe steady-state operation area under the current active power.
As shown in fig. 4, the reactive power margin F of the grid-connected pointQDefined as constant active power PccNext, the current operating point A (P) of the converter stationcc,Qcc) The shortest distance to the boundary L of the safe steady-state operation area.
The specific calculation process is as follows:
the reactive power margin FQIs about the reactive power Q of the new energy stationsGrid point voltage UpccAnd the converter station transformation ratio k and the current active power P of the grid-connected pointccAnd the current reactive power QccThe computer device obtains a reactive power Q of the new energy stationsGrid point voltage UpccAnd inputting the converter station transformation ratio k into the power flow equation to obtain the current active power P of the grid-connected pointccAnd the current reactive power QccI.e. the current operating point A (P) of the point of connectioncc，Qcc). The new energy power grid system is used as a sending end system, an area with the active power of the grid-connected point being greater than or equal to 0 is selected as the safe steady-state operation area S, the safe steady-state operation area boundary L is determined according to the safe steady-state operation area S, and the current operation point A of the grid-connected point keeps the active power P of the grid-connected pointccUnder the constant condition, the distances from the boundary L of the safe steady-state operation area are dQ1 and dQ2, namely the dQ1 and the dQ2 are the current reactive power Q of the grid-connected pointccAnd the securityDifference of boundary values of steady-state operating region, the reactive power margin FQIs the minimum of dQ1 and dQ 2.
In particular, the reactive power margin FQSatisfies the following formula:
FQ(Pcc,Qcc,Upcc,k)＝min{dQ1,dQ2}
wherein the reactive power margin FQThe maximum value of (3) is in the reactive power set of the new energy station, and the computer equipment selects and inputs different reactive powers Q of the new energy station into a function for solving the reactive power marginsMaximum value in the resulting set of reactive power margins.
In one embodiment, as shown in FIG. 5, a voltage margin F of the grid-connected point is obtainedUThe method comprises the following steps:
step S111': and acquiring a safe steady-state operation area of the active power and the reactive power of the grid-connected point according to a power flow equation.
Step S112': and acquiring the reactive power of the new energy station, the voltage of a grid-connected point and the transformation ratio of the converter station, and inputting the power flow equation to obtain the current active power and the current reactive power of the grid-connected point.
Wherein, the specific processes of the steps S111 'to S112' are the same as the process of obtaining the reactive power margin F of the grid-connected pointQThe specific steps in steps S111 to S112 are not described herein again.
Step S113': and acquiring the limit voltage of the grid-connected point according to the current active power, the current reactive power and the safe steady-state operation area.
And the limit voltage is the voltage of a grid connection point when the current active power and the current reactive power are used as boundary values of the safe steady-state operation region.
Step S114': and calculating the voltage margin according to the current active power, the current reactive power and the limit voltage.
And the voltage margin is the minimum value of the difference value between the grid-connected point voltage corresponding to the current active power and the current reactive power and the limit voltage.
As shown in fig. 6, the voltage margin F of the grid-connected pointUIs defined as the current operation point B (P) of the grid-connected pointcc,Qcc) Corresponding grid-connected point voltage UpccThe shortest distance to the limit voltage.
The specific calculation process is as follows:
the voltage margin FuIs about the reactive power Q of the new energy stationsGrid point voltage UpccAnd the converter station transformation ratio k and the current active power P of the grid-connected pointccAnd the current reactive power QccFunction of (a) to obtain a reactive power Q of the new energy stationsGrid point voltage UpccAnd the converter station transformation ratio k is input into the power flow equation to obtain the current active power P of the grid-connected pointccAnd reactive power QccI.e. the current running point B (P) of the point of connectioncc，Qcc). The limit voltage comprises a lower limit voltage Upcc1And upper limit voltage Upcc2The current operation point B (P) of the grid-connected pointcc，Qcc) Corresponding grid point voltage UpccAnd the lower limit voltage Upcc1And upper limit voltage Upcc2Are dU1 and dU2, that is, the current operation point B (P) of the grid-connected pointcc，Qcc) Corresponding grid point voltage UpccAnd the lower limit voltage Upcc1And the upper limit voltage Upcc2Absolute value of difference, said voltage margin FUIs the minimum of dU1 and dU 2.
Specifically, the voltage margin FUSatisfies the following formula:
FU(Pcc,Qcc,Upcc,k)＝min{dU1,dU2}
dU1＝∣Upcc-Upcc1∣
dU2＝∣Upcc-Upcc2∣
wherein the voltage margin FUThe maximum value of (b) is that the reactive power at the new energy station is the target reactive power,the transformation ratio k of the converter station is constant, and the computer equipment selects and inputs different grid-connected point voltages U to a function for solving the voltage marginpccThe maximum value in the resulting set of voltage margins.
In this embodiment, a reactive power margin optimization model is used to optimize the reactive power margin of the grid-connected point, so that the reactive power margin is maximized, where the reactive power margin of the grid-connected point includes a reactive power margin and a voltage margin, and the maximum value of the reactive power margin and the maximum value of the voltage margin when the reactive power margin is maximized are obtained respectively, so that the reactive power margin of the grid-connected point is maximized, and the safety performance of the operation of the power grid system is improved.
In an embodiment, as shown in fig. 7, before step S111 or S111', a step of obtaining the power flow equation is further included, which specifically includes the following steps:
step S1101: and acquiring a topological relation of the new energy station accessed to the converter station through a grid-connected point.
Specifically, the topological relation is used for reflecting an internal connection relation of the new energy power grid system. The flexible alternating current output by the new energy station is collected through a grid-connected point, a converter station transformer is connected into the converter station after being boosted, and then the flexible direct current is output by the converter station for supplying power to a load center.
Step S1102: and constructing an inter-node power flow equation and rated limit according to the topological relation.
Wherein the rated limit is used for representing the maximum bearing capacity of each node.
Specifically, the power flow equation is a function relation of power balance at each node bus in the new energy power grid system, and the rated limit is the maximum bearing capacity of physical quantities such as active power, reactive power and voltage of each node calculated according to the power flow equation.
Specifically, on the basis of the topological relation, the computer equipment constructs an inter-node power flow equation according to the power balance function relation of each node, and determines the active power P between each nodeiReactive power QiAnd node voltage UiIs composed ofA numerical relationship.
In one embodiment, as shown in fig. 8, step S111 or S111' further includes the following steps:
step S1111: and inputting the acquired grid-connected point voltage, the converter station transformation ratio and the grid-connected point active power and reactive power meeting the rated apparent power of the grid-connected point into the power flow equation to obtain the active power, reactive power and voltage of each node.
Wherein the grid-connected point active power PccAnd reactive power QccRated apparent power S of the grid-connected pointccThe following relationship is satisfied:
specifically, the computer device traverses the grid-connected point active power P satisfying the above formulaccAnd reactive power QccCombining the acquired grid-connected point voltage UPccAnd inputting the power flow equation into the converter station transformation ratio k, so as to obtain the active power, the reactive power and the voltage of each node according to the functional relation of the active power and the reactive power among the nodes.
Step S1112: and judging whether the active power, the reactive power and the voltage of each node meet the rated limit.
If the rated limit is met, the input active power P of the grid-connected point is reservedccAnd reactive power QccAnd obtaining the safe steady-state operation area.
Specifically, the rated limit includes a limit range of the device/equipment at each node and the whole system to the physical parameter concerned, and it is determined whether the physical parameter concerned is within the limit range.
Specifically, the computer device determines whether the active power, the reactive power and the voltage of each node meet the rated limit, and further determines whether the station apparent power, the alternating current input into the converter station, the direct current output from the converter station and the modulation ratio of the converter station are within the limit range.
The following rated limits are specifically met:
Qsmin≤Qs≤Qsmax
Umin≤Us,Upcc,Uv≤Umax
wherein Q issmaxAnd QsminRespectively an upper limit and a lower limit of the reactive power of the new energy station (determined by the reactive configuration capacity of the new energy station), UmaxAnd UminRepresents the upper and lower limits of the system voltage (generally, the per unit values are 1.07 and 0.97 in a 220kV system), UsIs the voltage of a new energy station, UvIs the voltage of the transformer of the converter station, SvIs rated apparent power, I, of the transformer of the converter stationvNRating the converter station for AC current, Idc maxIs the maximum value of the DC current of the converter station, UdcNIs the DC rated voltage of the converter station, m is the modulation ratio of the converter station, mmaxAnd mminThe modulation ratio upper and lower limits (generally taking values of 1.15 and 1), and mu is the direct-current voltage utilization rate (generally taking value of 0.866).
In one embodiment, as shown in fig. 9, step S113' specifically includes:
step S1131': and inputting the prepared data into the power flow equation, and obtaining different safe steady-state operation areas under different grid-connected point voltages according to the rated limit.
The preparation data comprise the acquired converter station transformation ratio, the grid-connected point voltage meeting the rated limit, and the grid-connected point active power and reactive power meeting the rated apparent power of the grid-connected point.
Specifically, the computer equipment inputs the acquired converter station transformation ratio k into the power flow equation and selects and inputs different grid-connected point voltages UpccSatisfying the rated apparent power S of the grid-connected point by traversingccThe grid-connected point active power PccAnd reactive power QccTo obtain different grid-connected point voltages UpccAnd correspondingly different safe steady-state operation areas.
Step S1132': and judging whether the obtained boundary values of different safe steady-state operation areas comprise the current active power and the current reactive power of the grid-connected point.
And if so, taking the voltage of the grid-connected point corresponding to the previous active power and the current reactive power as the limit voltage.
Specifically, the computer device determines a boundary value of the safe steady-state operation region from the safe steady-state operation region, and sets the current operation point of the grid-connected point, i.e. the current active power PccAnd the current reactive power QccWith different grid-connected point voltages UpccComparing the boundary values of the corresponding different safe steady-state operation areas, and judging the different grid-connected point voltages UpccWhether the current active power P is included in the boundary values of the corresponding different safe steady-state operation areasccAnd the current reactive power Qcc。
Specifically, the computer equipment inputs different grid-connected point voltages U to the power flow equation one by onepccTo obtain corresponding different safe steady-state operation areas, and then judging whether the boundary value of the obtained safe steady-state operation area comprises the current active power PccAnd the current reactive power QccI.e. whether the current operating point of the point-of-connection is obtainedOn the boundaries of the different safe steady state operating regions. And if so, taking the obtained safe steady-state operation area as a limit steady-state operation area of the current grid-connected point operation point. As shown in fig. 6, when the grid-connected point voltage U is inputtedpccWhen the current operation point is equal to 1, the safe steady-state operation area a is obtained, and the current operation point B (P) of the grid-connected point is obtainedcc,Qcc) Within the safe steady state operating region a; when the grid-connected point voltage U is inputpcc1When the current operating point B is 0.98, the safe steady-state operating area B is obtained, and the current operating point B (P) of the grid-connected point is obtainedcc,Qcc) On the boundary of the safe steady-state operation area b; when the grid-connected point voltage U is inputpcc2When the current operation point is 1.02, the safe steady-state operation area c is obtained, and the current operation point B (P) of the grid-connected point is obtainedcc,Qcc) On the boundary of the safe steady-state operation region c; when the grid-connected point voltage U is inputpcc3When the current operation point is 1.04, the safe steady-state operation area d is obtained, and the current operation point B (P) of the grid-connected point is obtainedcc,Qcc) Outside the safe steady state operating region d. From this, the current operation point B (P) of the grid-connected point can be obtainedcc,Qcc) Corresponding lower limit voltage Upcc1And upper limit voltage Upcc2。
In the embodiment, the safe steady-state operation area and the limit voltage are respectively solved by adopting a trial-and-error method, and then the maximum value of the reactive power margin and the maximum value of the voltage margin are solved to obtain the maximum value of the reactive margin.
In one embodiment, the new energy station includes at least two sub-stations, and in order to equalize reactive power output of each sub-station of the new energy station, that is, output reactive power is equivalent, the new energy station can regulate and control voltage and reactive power of the whole power grid system in time, and improve the safety of the power grid system, as shown in fig. 10, step S13 specifically includes the following steps:
step S131: and acquiring the sub reactive power of the sub station.
And the reactive power of the new energy station comprises the sum of the sub reactive powers of the sub stations.
Specifically, the reactive power Q of the new energy stationsFor the total reactive power of the new energy station, in order to ensure that the safety margin F of the grid-connected point is maximum, the total reactive power Q of the new energy stationsAnd the target reactive power Q obtained by the reactive margin optimization modelsrefEqual or difference is less than preset difference to make the total reactive power QsAnd the target reactive power QsrefAnd (4) approaching.
Wherein, total reactive power Q of the new energy stationsIs equal to the sub reactive power Q of each sub-stationiAnd (4) summing.
Specifically, the following formula is satisfied:
wherein W is the total number of sub-field stations included in the new energy field station, and i is 1,2, …, W.
Step S132: and inputting the sub reactive power into a well established reactive power balance optimization model to obtain the target sub reactive power with balanced output of the sub-field station.
The reactive power balance optimization model is a model comprising reactive power coordination factors of the sub-field stations, the reactive power coordination factors are used for representing reactive power output degrees of the sub-field stations, and differences among the reactive power coordination factors are smaller than or equal to preset coordination factor differences.
Specifically, one of the sub-stations corresponds to a reactive coordination factor.
In this embodiment, the reactive power equalization optimization model includes that the difference value of the reactive power coordination factors between the sub-field stations is less than or equal to 0.05, which can meet the optimization purpose of the reactive power equalization optimization model, so that the reactive power output of each sub-field station is equalized. Wherein the optimization variable is the reactive power Q of the sub-stationi。
Specifically, the reactive power coordination factor is a ratio of a first difference value and a second difference value, the first difference value is a difference between sub-reactive power of the sub-field station and minimum reactive power of the sub-field station, and the second difference value is a difference between maximum sub-reactive power of the sub-field station and minimum reactive power of the sub-field station.
Specifically, the following formula is satisfied:
|θi-θj|≤0.05
wherein Q isWBeing reactive power of sub-stations, QWminAnd QWminThe minimum reactive power and the maximum reactive power of the sub-stations are determined by the reactive configuration capacity of each sub-station, W is the total number of the sub-stations included in the new energy station, i, j is 1,2, …, W i is not equal to j.
Step S133: and configuring the sub reactive power of the sub-field station according to the target sub reactive power.
In this embodiment, after the target reactive power of the new energy station is obtained through a reactive margin optimization model, a computer device further optimizes the target reactive power through a reactive balance optimization model, and performs sub reactive power distribution and input on the sub reactive power of the sub station according to the obtained target sub reactive power optimized through the reactive balance optimization model, so that the total reactive power of the new energy station is equal to the target reactive power, the reactive margin of the grid-connected point is maximized, the reactive power regulation capability of the new energy station is increased, and the safe operation capability of a power grid system is improved.
In one embodiment, there is provided a reactive power configuration device including:
the acquisition module is used for acquiring the reactive power of the new energy station, the voltage of a grid-connected point and the transformer ratio of the converter station, inputting the well-established reactive margin optimization model and obtaining the reactive margin of the grid-connected point; wherein the reactive margin comprises a sum of a reactive power margin and a voltage margin;
the calculation module is used for obtaining the maximum value of the reactive margin and calculating to obtain the target reactive power of the new energy station corresponding to the maximum value;
and the configuration module is used for configuring the reactive power of the new energy station according to the target reactive power.
The reactive power configuration apparatus provided in this embodiment may implement the above method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.
In one embodiment, a computer device is provided, comprising a memory storing a computer program and a processor implementing the steps of any of the above methods when the processor executes the computer program.
In an embodiment, a readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the method of any of the above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
In summary, according to the reactive power configuration method provided by the invention, the target reactive power of the new energy station when the reactive margin is the maximum is obtained according to the constructed grid-connected point reactive margin optimization model, and then the reactive power of the new energy station is configured according to the target reactive power, the reactive power margin and the voltage margin are comprehensively considered, the safety performance of the operation of the power grid system is integrally improved, specifically, the reactive power margin and the voltage margin are solved by adopting a trial-and-error method, the solving method is simple and convenient, and further, the model optimization speed is improved; and further optimizing the sub reactive power of the sub-stations of the new energy station according to the constructed reactive power balance optimization model, so that the reactive power output balance of each sub-station is met while the total reactive power of the new energy station is equal to or close to the target reactive power obtained by the reactive power margin optimization model, and therefore the voltage and the reactive power of the whole power grid system can be timely regulated and controlled by the new energy station, and the operation safety of the power grid system is improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A reactive power configuration method is applied to a new energy station to supply power to a load center through a grid-connected point access converter station, and is characterized by comprising the following steps:
acquiring reactive power of the new energy station, voltage of a grid-connected point and a transformation ratio of a converter transformer, and inputting the obtained reactive power, voltage and transformation ratio into a well-established reactive power margin optimization model to obtain the reactive power margin of the grid-connected point; wherein the reactive margin comprises a sum of a reactive power margin and a voltage margin;
obtaining the maximum value of the reactive margin, and calculating to obtain the target reactive power of the new energy station corresponding to the maximum value;
configuring reactive power of the new energy station according to the target reactive power;
the reactive power margin is obtained by the following steps:
acquiring a safe steady-state operation area of active power and reactive power of the grid-connected point according to a power flow equation;
inputting the obtained reactive power of the new energy station, the voltage of a grid-connected point and the transformation ratio of a converter transformer into the power flow equation to obtain the current active power and the current reactive power of the grid-connected point;
calculating the reactive power margin according to the current active power, the current reactive power and the safe steady-state operation area; the reactive power margin is the minimum value of the boundary value difference between the current reactive power and the safe steady-state operation area under the current active power;
the voltage margin is obtained by the following steps:
acquiring a safe steady-state operation area of active power and reactive power of the grid-connected point according to a power flow equation;
inputting the obtained reactive power of the new energy station, the voltage of a grid-connected point and the transformation ratio of a converter transformer into the power flow equation to obtain the current active power and the current reactive power of the grid-connected point;
acquiring the limit voltage of the grid-connected point according to the current active power, the current reactive power and the safe steady-state operation area; the limit voltage is the voltage of a grid-connected point when the current active power and the current reactive power are used as boundary values of the safe steady-state operation region;
calculating the voltage margin according to the current active power, the current reactive power and the limit voltage; and the voltage margin is the minimum value of the difference value between the grid-connected point voltage corresponding to the current active power and the current reactive power and the limit voltage.
2. The method according to claim 1, wherein before the step of obtaining the reactive power of the new energy station, the voltage of a grid-connected point, and the transformation ratio of a converter transformer, and inputting the power flow equation to obtain the current active power and the current reactive power of the grid-connected point, the method further comprises:
acquiring a topological relation of the new energy station accessed to the converter station through a grid-connected point;
constructing an inter-node power flow equation and rated limit according to the topological relation; the rated limit is used for representing the maximum bearing capacity of each node.
3. The method of claim 2, wherein the step of obtaining safe steady state operating regions of the grid-connected point active power and reactive power according to a power flow equation comprises:
inputting the obtained voltage of the grid-connected point, the transformation ratio of a converter transformer and the active power and the reactive power of the grid-connected point meeting the rated apparent power of the grid-connected point into the power flow equation to obtain the active power, the reactive power and the voltage of each node;
judging whether the active power, the reactive power and the voltage of each node meet the rated limit;
and if so, retaining the input active power and reactive power of the grid-connected point to obtain the safe steady-state operation area.
4. The method according to claim 1, wherein the step of obtaining the limit voltage of the grid-connected point according to the current active power, the current reactive power and the safe steady-state operation area comprises:
inputting prepared data into the power flow equation, and obtaining different safe steady-state operation areas under different grid-connected point voltages according to rated limits; the preparation data comprise the acquired transformation ratio of the converter transformer, the voltage of a grid-connected point meeting the rated limit, and the active power and the reactive power of the grid-connected point meeting the rated apparent power of the grid-connected point; the rated limit is used for representing the maximum bearing capacity of each node;
judging whether the obtained boundary values of different safe steady-state operation areas comprise the current active power and the current reactive power;
and if so, taking the voltage of the grid-connected point corresponding to the current active power and the current reactive power as the limit voltage.
5. The method of claim 1, wherein the new energy site comprises at least two sub-sites, the reactive power of the new energy site comprising a sum of sub-reactive powers of the sub-sites; the step of configuring the reactive power of the new energy station according to the target reactive power comprises the following steps:
acquiring sub reactive power of the sub-stations;
inputting the sub reactive power into a well-established reactive power balance optimization model to obtain the target sub reactive power with balanced output of the sub-field station; the reactive power balance optimization model is a model comprising reactive power coordination factors of the sub-field stations, the reactive power coordination factors are used for representing reactive power output degrees of the sub-field stations, and the difference value between the reactive power coordination factors is smaller than or equal to a preset coordination factor difference value;
and configuring the sub reactive power of the sub-field station according to the target sub reactive power.
6. The method of claim 5, wherein the reactive coordination factor is a ratio of a first difference value and a second difference value, the first difference value being a difference between the sub-field station sub-reactive power and the sub-field station minimum reactive power, the second difference value being a difference between the sub-field station maximum sub-reactive power and the sub-field station minimum reactive power;
and the difference value between the reactive coordination factors corresponding to any two sub-field stations is less than or equal to 0.05.
7. The method of claim 1, wherein the reactive margin optimization model satisfies the following equation:
F=αFQ+(1-α)FU
wherein alpha is a weight coefficient, F is a reactive margin, FQFor margin of reactive power, FUIs the voltage margin.
8. A reactive power configuration device, characterized in that the reactive power configuration device comprises:
the acquisition module is used for acquiring the reactive power of the new energy station, the voltage of a grid-connected point and the transformation ratio of the converter transformer, inputting the well-established reactive margin optimization model and obtaining the reactive margin of the grid-connected point; wherein the reactive margin comprises a sum of a reactive power margin and a voltage margin;
the calculation module is used for obtaining the maximum value of the reactive margin and calculating to obtain the target reactive power of the new energy station corresponding to the maximum value;
the configuration module is used for configuring the reactive power of the new energy station according to the target reactive power;
the reactive power margin is obtained by the following steps:
acquiring a safe steady-state operation area of active power and reactive power of the grid-connected point according to a power flow equation;
inputting the obtained reactive power of the new energy station, the voltage of a grid-connected point and the transformation ratio of a converter transformer into the power flow equation to obtain the current active power and the current reactive power of the grid-connected point;
calculating the reactive power margin according to the current active power, the current reactive power and the safe steady-state operation area; the reactive power margin is the minimum value of the boundary value difference between the current reactive power and the safe steady-state operation area under the current active power;
the voltage margin is obtained by the following steps:
acquiring a safe steady-state operation area of active power and reactive power of the grid-connected point according to a power flow equation;
inputting the obtained reactive power of the new energy station, the voltage of a grid-connected point and the transformation ratio of a converter transformer into the power flow equation to obtain the current active power and the current reactive power of the grid-connected point;
acquiring the limit voltage of the grid-connected point according to the current active power, the current reactive power and the safe steady-state operation area; the limit voltage is the voltage of a grid-connected point when the current active power and the current reactive power are used as boundary values of the safe steady-state operation region;
calculating the voltage margin according to the current active power, the current reactive power and the limit voltage; and the voltage margin is the minimum value of the difference value between the grid-connected point voltage corresponding to the current active power and the current reactive power and the limit voltage.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.
10. A readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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