CN114142486B - Calculation method and device for dynamic reactive compensation response time and computer equipment - Google Patents
Calculation method and device for dynamic reactive compensation response time and computer equipment Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a method, a device and computer equipment for calculating dynamic reactive compensation response time, which are applied to a power system, wherein the power system comprises the following components: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output of the power transmission line is for connecting a load, the method comprising: acquiring first power operation data of a load and second power operation data of a transformer access point; calculating a first reactive power before the load step and a second reactive power after the step based on the first power operation data and the second power operation data; determining the starting moment of the step response time based on the actual reactive power of the load, the first reactive power and the second reactive power, and determining the ending moment of the step response time based on the actual reactive power of the load and a preset power range; a dynamic reactive compensation response time is determined based on the start time and the end time.
Description
Technical Field
The invention relates to the technical field of dynamic reactive power compensation, in particular to a method and a device for calculating dynamic reactive power compensation response time and computer equipment.
Background
At present, the dynamic reactive power compensation device mainly comprises a static reactive power compensation device (static VAR compensator, SVC), a static synchronous compensator (Static synchronous compensator, STATCOM) and a fast dynamic response synchronous tuner (fast dynamic response synchronous condenser).
The static reactive power compensation device is a parallel controllable reactive power compensation device formed by static elements, and the output is regulated by changing the capacitive or (and) inductive equivalent impedance of the static reactive power compensation device so as to maintain or control specific parameters (typical parameters are voltage and reactive power) of the power system.
The power industry standard DL/T1010.1-2006, high voltage static var compensator part 1 System design, defines a response time (response time) and a settling time (settling time). The response time is defined as: when the step control signal is input, the SVC output takes a time of 90% of the required output value, and no overshoot is generated during the time. The definition of the calm time is: when the step control signal is input, the SVC output takes time to reach within + -5% of the required output value. As shown in fig. 9, a response time and a settling time are schematically shown.
A static synchronous compensator (STATCOM) is a static synchronous generator consisting of voltage source converters connected in parallel to a system, the capacitive or inductive reactive current of which output is continuously adjustable and independent of the system voltage in the range of the operational system voltage. When used in a power distribution system, it is also known as a power distribution static synchronous compensator (D-STATCOM).
Power industry Standard DL/T1215.1-2015 part 1 of chain static synchronous compensator: the function specification rules define a step response time (step response time) and a settling time (settling time). The step response time is defined as: when the step control signal is input, the chain STATCOM output takes a time of 90% of the required output value and no overshoot is generated during this time. The definition of the calm time is: when the step control signal is input, the chained STATCOM outputs the time taken for the electric quantity to reach and stabilize within ±5% of the target value.
The synchronous phase regulator (synchronous compensator) is a large-scale non-salient pole synchronous motor which is connected with a power grid, does not convert electromechanical energy through a shafting, and only transmits or absorbs reactive power to the power grid by changing exciting current. The fast dynamic response synchronous phase-tuning machine (fast dynamic response synchronous condenser) has fast dynamic reactive power adjustment and short-time overload capacity, is mainly used for providing dynamic reactive power support for a system under fault working conditions, and simultaneously has a steady-state reactive power compensation function.
The national grid company corporation's enterprise standard Q/GDW 11588-2016 technical specification for fast dynamic response synchronous regulation sets forth capacity class, reactive power running capability, stator winding overload capability, rotor winding overload capability, reactance values (direct axis synchronous reactance, transverse axis synchronous reactance, direct axis transient reactance, transverse axis transient reactance), time constants, etc., but has no definition or definition similar to the response time, the tranquilization time. The national standard GB/T7064-2017 'technical requirement of non-salient pole synchronous generator' and the use instruction of synchronous speed regulator have no definition or regulation of similar response time and stabilization time.
In the existing scheme, the response time and the stabilization time of different dynamic reactive power compensation devices are defined differently, and even for some specific types of dynamic reactive power compensation devices, the response time and the stabilization time are not defined explicitly, so that in practical application, compensation parameters used in the dynamic reactive power compensation are not universal, and the calculation result of the reactive power compensation is not accurate easily.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the compensation parameters used in the dynamic reactive power compensation in the prior art are not universal and the calculation result of the reactive power compensation is inaccurate, so as to provide a calculation method, a device and computer equipment for the response time of the dynamic reactive power compensation.
According to a first aspect, an embodiment of the present invention provides a method for calculating a dynamic reactive compensation response time, applied to an electric power system, where the electric power system includes: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output of the power transmission line is used for connecting a load, the method comprising: acquiring first power operation data of the load and second power operation data of the transformer access point; calculating a first reactive power before the load step and a second reactive power after the step based on the first and second power operation data; determining the starting moment of the step response time based on the actual reactive power of the load and the first reactive power and the second reactive power, and determining the ending moment of the step response time based on the actual reactive power of the load and a preset power range; and determining a dynamic reactive compensation response time based on the starting time and the ending time.
Optionally, determining the start time of the step response time based on the actual reactive power of the load and the first reactive power and the second reactive power, and determining the end time of the step response time based on the actual reactive power of the load and the preset power range includes: adding the first reactive power with the second reactive power based on a first preset ratio of the second reactive power to the first reactive power difference to obtain a power value of the response time at the beginning time; obtaining the starting time of the step response time based on the power value of the starting time of the response time; adding the second preset proportion of the preset power range and the first power difference with the first power to obtain a power value at the end time of the response time; and obtaining the end time of the step response time based on the power value of the end time of the response time.
Optionally, the starting instant of the step response time and the ending instant of the step response time are calculated according to the following formulas:
Q L1 +(Q L2 -Q L1 )*10％，
Q L1 +(Q S -Q L1 )×90％，
wherein Q is L1 For the first passive power, Q L2 For the second reactive power, 10% is the first preset proportion, Q S For the preset power range, 90% is the second preset ratio.
According to a second aspect, an embodiment of the present invention provides a method for calculating a dynamic reactive compensation response time, applied to an electric power system, the electric power system including: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output of the power transmission line is used for connecting a load, the method comprising: acquiring first power operation data of the transformer access point; calculating a first power frequency amplitude before the load step and a second power frequency amplitude after the step based on the first power operation data; determining the starting time of the step response time based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and determining the ending time of the step response time based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage; and determining a dynamic reactive compensation response time based on the starting time and the ending time.
Optionally, determining the start time of the step response time based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and determining the end time of the step response time based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage includes: adding a first preset proportion based on the difference between the second power frequency amplitude and the first power frequency amplitude with the first power frequency amplitude to obtain a power value of the response time at the beginning time; obtaining the starting time of the step response time based on the power value of the starting time of the response time; adding a second preset proportion based on the difference between the preset voltage power frequency amplitude and the initial voltage power frequency amplitude with the initial voltage power frequency amplitude to obtain the voltage power frequency amplitude at the end time of the response time; and obtaining the end time of the step response time based on the voltage power frequency amplitude at the end time of the response time.
Optionally, the starting instant of the step response time and the ending instant of the step response time are calculated according to the following formulas:
U 1 +(U 2 -U 1 )*10％，
Q D1 +(Q O -Q D1 )*90％，
wherein U is 1 U is the first power frequency amplitude 2 For the second power frequency amplitude, 10% is the first preset proportion, Q O To preset the power frequency amplitude of voltage, Q D1 For the power frequency amplitude of the initial voltage, 90% is the second preset proportion.
According to a third aspect, an embodiment of the present invention provides a computing device for dynamic reactive compensation response time, applied to an electric power system, the electric power system comprising: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output of the power transmission line is for connecting a load, the apparatus comprising: the first acquisition module is used for acquiring first power operation data of the load and second power operation data of the transformer access point; the first calculation module is used for calculating the first reactive power before the load step and the second reactive power after the load step based on the first power operation data and the second power operation data; the first moment determining module is used for determining the starting moment of the step response time based on the actual reactive power of the load, the first reactive power and the second reactive power, and determining the ending moment of the step response time based on the actual reactive power of the load and a preset power range; and the first time determining module is used for determining the dynamic reactive compensation response time based on the starting time and the ending time.
According to a fourth aspect, an embodiment of the present invention provides a dynamic reactive compensation response time calculation device applied to an electric power system, the electric power system including: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output of the power transmission line is for connecting a load, the apparatus comprising: the second acquisition module is used for acquiring first power operation data of the transformer access point; the second calculation module is used for calculating a first power frequency amplitude before the load step and a second power frequency amplitude after the load step based on the first power operation data; the second moment determining module is used for determining the starting moment of the step response time based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and determining the ending moment of the step response time based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage; and the second time determining module is used for determining the dynamic reactive compensation response time based on the starting time and the ending time.
According to a fifth aspect, an embodiment of the present invention further discloses a computer device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the steps of the method of calculating a dynamic reactive compensation response time as described in the first aspect or any of the alternative embodiments of the first aspect or to cause the at least one processor to perform the steps of the method of calculating a dynamic reactive compensation response time as described in the second aspect or any of the alternative embodiments of the second aspect.
According to a sixth aspect, embodiments of the present invention provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for calculating a dynamic reactive compensation response time according to the first aspect or any of the alternative embodiments of the first aspect, or the steps of the method for calculating a dynamic reactive compensation response time according to the second aspect or any of the alternative embodiments of the second aspect.
The technical scheme of the invention has the following advantages:
the invention provides a method and a device for calculating dynamic reactive compensation response time and computer equipment, wherein the method comprises the following steps: acquiring first power operation data of a load and second power operation data of a transformer access point, and calculating first reactive power before load step and second reactive power after step based on the first power operation data and the second power operation data; determining the starting moment of the step response time based on the actual reactive power of the load, the first reactive power and the second reactive power, and determining the ending moment of the step response time based on the actual reactive power of the load and a preset power range; a dynamic reactive compensation response time is determined based on the start time and the end time. According to the obtained first power operation data and second power operation data, the first reactive power before load step and the second reactive power after step can be accurately obtained, the starting time and the ending time of the response time are regulated according to the first reactive power and the second reactive power, and the time required for detecting the dynamic reactive compensation step response time process and the time required for testing the calculation instruction value of the dynamic reactive compensation step response time can be accurately and accurately reflected.
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The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1 is an application apparatus of a method for calculating a dynamic reactive compensation response time in an embodiment of the present invention;
FIG. 2 is a flowchart of a specific example of a method for calculating a dynamic reactive compensation response time in an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a specific example of a method for calculating a dynamic reactive compensation response time according to an embodiment of the present invention;
FIG. 4 is a flowchart of a specific example of a method for calculating a dynamic reactive compensation response time in an embodiment of the present invention;
FIG. 5 is a schematic diagram showing a specific example of a method for calculating a dynamic reactive compensation response time according to an embodiment of the present invention;
FIG. 6 is a schematic block diagram of one specific example of a dynamic reactive compensation response time calculation device in an embodiment of the present invention;
FIG. 7 is a schematic block diagram of a specific example of a method for calculating a dynamic reactive compensation response time in an embodiment of the present invention;
FIG. 8 is a diagram of a computer device in accordance with an embodiment of the present invention;
FIG. 9 is a schematic diagram of response time and settling time in the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The method for calculating the dynamic reactive compensation response time disclosed by the embodiment of the invention is applied to the power system shown in the figure 1, and the power system comprises the following steps: the dynamic reactive power compensation device 1 is connected via a transformer 2 to a first output B of a power transmission line, a second output a of which is used for connecting a load.
The embodiment of the invention discloses a method for calculating response time of dynamic reactive power compensation, which is shown in fig. 2, and comprises the following steps of:
step 201: and acquiring first power operation data of the load and second power operation data of the transformer access point. The first power operation data of the load is illustratively indicative of the measured current i of the load L Second electricityThe force operation data represent the voltage u at the point A, and the first power operation data and the second power operation data can be obtained through measurement of an ammeter or a voltmeter and the like.
Step 202: and calculating the first reactive power before the load step and the second reactive power after the load step based on the first power operation data and the second power operation data. The first reactive power may be, for example, a current i of the load based on the measurement L And the voltage u at the point A is calculated, and the second reactive power can be calculated according to the current and the voltage of the corresponding point after the measurement step.
Step 203: and determining the starting moment of the step response time based on the actual reactive power of the load and the first reactive power and the second reactive power, and determining the ending moment of the step response time based on the actual reactive power of the load and a preset power range. The starting moment of the step response time is illustratively a starting moment when the actual reactive power of the load reaches a given value. The end time of the step response time is determined from the value of the actual reactive power of the load reaching a given preset power.
Step 204: and determining a dynamic reactive compensation response time based on the starting time and the ending time. For example, the starting time and the ending time may result in corresponding dynamic reactive compensation response times.
The invention provides a calculation method of dynamic reactive compensation response time, which is applied to a power system, wherein the power system comprises the following components: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output of the power transmission line is for connecting a load, the method comprising: acquiring first power operation data of a load and second power operation data of a transformer access point; calculating a first reactive power before the load step and a second reactive power after the step based on the first power operation data and the second power operation data; determining the starting moment of the step response time based on the actual reactive power of the load, the first reactive power and the second reactive power, and determining the ending moment of the step response time based on the actual reactive power of the load and a preset power range; a dynamic reactive compensation response time is determined based on the start time and the end time. According to the obtained first power operation data and second power operation data, the first reactive power before load step and the second reactive power after step can be accurately obtained, the starting time and the ending time of the response time are regulated according to the first reactive power and the second reactive power, and the time required for detecting the dynamic reactive compensation step response time process and the time required for testing the calculation instruction value of the dynamic reactive compensation step response time can be accurately and accurately reflected.
As an optional embodiment of the present invention, the step 203 includes: adding the first reactive power with the second reactive power based on a first preset ratio of the second reactive power to the first reactive power difference to obtain a power value of the response time at the beginning time; obtaining the starting time of the step response time based on the power value of the starting time of the response time; adding the second preset proportion of the preset power range and the first power difference with the first power to obtain a power value at the end time of the response time; and obtaining the end time of the step response time based on the power value of the end time of the response time.
Exemplary, as shown in FIG. 3, to correspond to a response time for increasing the power factor, Q L1 For the first passive power, Q L2 For the second reactive power, when the actual reactive power Q of the load LY When a first preset proportion of the first reactive power of 10% is reached, as a starting point of the response time, wherein when the actual reactive power Q of the load is Ly The power value at the start time of the response time when the first preset proportion of the first reactive power reaches 10% is calculated by the following formula:
Q L1 +(Q L2 -Q L1 )*10％，
The preset power range is according to the initial value Q L1 To steady state value Q S To determine that when the output power frequency reactive power of the dynamic reactive power compensation device reaches 90%, the dynamic reactive power compensation device is taken as the ending time of the response time, and the specific ending time of the response timeThe power value of the etch is calculated by the following formula:
Q L1 +(Q S -Q L1 )×90％。
the step response time of the dynamic reactive power compensation device is from the moment of exceeding the preset value to the moment that the output power frequency reactive power of the dynamic reactive power compensation device reaches 90% of the actual change value.
The method for calculating the dynamic reactive compensation response time provided by the invention is applied to a power system shown in fig. 1, and as shown in fig. 3, the method embodiment is a method for calculating the stable power grid voltage according to a dynamic reactive compensation device, and the method comprises the following steps:
step 401: and acquiring first power operation data of the transformer access point. The first power operation data is illustratively representative of the measured point a voltage u.
Step 402: and calculating a first power frequency amplitude before the load step and a second power frequency amplitude after the load step based on the first power operation data. Exemplary, as shown in FIG. 4, the power frequency amplitude of the voltage at the point A before the step is U 1 The power frequency amplitude of the voltage after the step is U 2 。
Step 403: and determining the starting time of the step response time based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and determining the ending time of the step response time based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage. Illustratively, the start time of the step response time is based on the start time when the power frequency amplitude of the actual voltage of the load reaches a given value. And determining the ending time according to the fact that the power frequency amplitude of the actual voltage of the load reaches the value of the preset power.
Step 404: and determining a dynamic reactive compensation response time based on the starting time and the ending time.
For example, the starting time and the ending time may result in corresponding dynamic reactive compensation response times.
The invention provides a calculation method of dynamic reactive compensation response time, which is applied to a power system, wherein the power system comprises the following components: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output of the power transmission line is used for connecting a load, the method comprising: acquiring first power operation data of the transformer access point; calculating a first power frequency amplitude before the load step and a second power frequency amplitude after the step based on the first power operation data; determining the starting time of the step response time based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and determining the ending time of the step response time based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage; and determining a dynamic reactive compensation response time based on the starting time and the ending time. According to the set dynamic reactive compensation response time, the time required by the detection process and the time required by calculating the instruction value can be accurately reflected. The first reactive power before load step and the second reactive power after step can be accurately obtained according to the obtained first power operation data and the second power operation data, the starting time and the ending time of the response time are regulated according to the first reactive power and the second reactive power, and the time required by the dynamic reactive compensation step response time detection process and the time required by the dynamic reactive compensation step response time test calculation instruction value can be accurately and accurately reflected.
As an optional embodiment of the present invention, the step 403 includes: adding a first preset proportion based on the difference between the second power frequency amplitude and the first power frequency amplitude with the first power frequency amplitude to obtain a power value of the response time at the beginning time; obtaining the starting time of the step response time based on the power value of the starting time of the response time; adding a second preset proportion based on the difference between the preset voltage power frequency amplitude and the initial voltage power frequency amplitude with the initial voltage power frequency amplitude to obtain the voltage power frequency amplitude at the end time of the response time; and obtaining the end time of the step response time based on the voltage power frequency amplitude at the end time of the response time.
Illustratively, as shown in FIG. 5, is a response to a step response at a steady voltageSchematic diagram of response time, U in the diagram 1 U is the first power frequency amplitude 2 For the second power frequency amplitude, when the actual power frequency amplitude of the voltage of the load exceeds U y When reaching the first preset proportion of 10% of the first power frequency amplitude, the starting moment of response time is taken as the starting moment of response time, wherein when the actual reactive power U of the load y The power frequency amplitude reaching the starting moment of the response time when reaching the first preset proportion of 10% of the first power frequency amplitude is calculated by the following formula:
U 1 +(U 2 -U 1 )*10％。
The power frequency amplitude of the initial voltage of the dynamic reactive power compensation device is Q D1 The power frequency amplitude of the preset voltage is the power frequency amplitude Q of the initial voltage D1 To an overload value Q O 90% of the power frequency is a second preset proportion, the arrival of the specific response time is determined, and the power frequency amplitude at the end time of the specific response time is calculated by the following formula: q (Q) D1 +(Q O -Q D1 )*90％。
The method for calculating the dynamic reactive power compensation response time can be applied to an application scene for improving the power factor and a scene for stabilizing the voltage, specifically, (1) the step response time of the dynamic reactive power compensation device is from the moment of exceeding a preset value to the moment when the dynamic reactive power compensation device outputs power frequency reactive power to reach 90% of an actual change value, and the preset value is 10% of the preset value in the embodiment.
(2) For the application scenario of stabilizing voltage by using the dynamic reactive power compensation device, if the access point of the device and the voltage required stabilization point are different, the set value in (1) refers to the voltage value of the voltage required stabilization point.
(3) The voltage value in (2) refers to an effective value or a power frequency amplitude of the required stable voltage.
(4) For the effective value or the power frequency amplitude of the voltage to be stabilized in (3), the effective value or the power frequency amplitude of the voltage to be stabilized in (3) can be the maximum value, the minimum value or the three-phase average value in the three-phase values.
(5) For the application scenario in which the dynamic reactive power compensation device is used to increase the power factor, the default value in (1) refers to the fundamental reactive power value of the load to be compensated.
(6) For the fundamental reactive power value of the compensation load required in (5), it should be the sum of the three phase values for the three phase system.
(7) For the output power frequency reactive power in (1), if harmonic components exist in the input voltage or/and current, the influence of the harmonic components on the calculation result should be eliminated when the reactive power is calculated. The corresponding elimination method is Fourier transform or fast Fourier transform, etc.
(8) For the output power frequency reactive power in (1), if the device and the power grid have active power interaction, the influence of the exchanged active power on a calculation result is eliminated when the reactive power is calculated.
(9) For the output power frequency reactive power in (1), if the device has overload capacity and the overload capacity is actually used in practical application, the practical change value of the output power frequency reactive power of the device should calculate a 90% corresponding value according to the working condition that the device exerts the overload capacity.
(10) For the output power frequency reactive power in the step change process, if overshoot exists in the step change process and the overshoot value does not exceed 20%, the actual change value of the output power frequency reactive power of the device should calculate a 90% corresponding value according to neglecting the overshoot.
(11) For the actual variation value of the output power frequency reactive power in the step (1), if the instruction value of the device and the actual value of the device have no obvious deviation, the instruction value of the device can be used for calculating the 90% corresponding value. If the command value and the actual value of the device have a non-negligible deviation, the command value of the device cannot be used to calculate the 90% corresponding value.
(12) And (3) calculating the effective value or the power frequency amplitude value in the step (3) by adopting data corresponding to a power frequency when the reactive power actual value in the step (1) is calculated correspondingly.
(13) The data of one power frequency in (12) may be (a) data between the current time and a time before the power frequency, or (b) first half power frequency data and second half power frequency data of the current time. However, in practical application, only (a) or (b) can be selected, and the selection cannot be made as part (a) or the selection (b) is made as the other part.
(14) For the default value in (1), a percentage of the total step change value is added to the initial value.
(15) For the percentages in (14), 10%, 20% and 50% are possible.
(16) And (3) for the effective value or the power frequency amplitude value in (3), the reactive power in (1) can be correspondingly calculated, and the influence caused by frequency change can be ignored.
The embodiment of the invention also discloses a calculating device of the dynamic reactive compensation response time, which is applied to a power system, wherein the power system comprises: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; the second output end of the power transmission line is used for connecting a load, as shown in fig. 6, and the device includes:
the first obtaining module 601 is configured to obtain first power operation data of the load and second power operation data of the transformer access point. Illustratively, details of the above method step 201 are provided, and will not be repeated herein.
A first calculation module 602 is configured to calculate a first reactive power before the load step and a second reactive power after the load step based on the first power operation data and the second power operation data. Illustratively, the details of the method step 202 are described above, and will not be repeated here.
The first moment determining module 603 is configured to determine a start moment of the step response time based on the actual reactive power of the load and the first reactive power and the second reactive power, and determine an end moment of the step response time based on the actual reactive power of the load and a preset power range. For example, the details of the method step 203 are described above, and will not be described herein.
A first time determination module 604 for determining a dynamic reactive compensation response time based on the start time and the end time. For example, the details of the method step 204 are described above, and will not be described herein.
The invention provides a calculating device of dynamic reactive compensation response time, which is applied to a power system, wherein the power system comprises: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output of the power transmission line is for connecting a load, the apparatus comprising: the first acquisition module is used for acquiring first power operation data of the load and second power operation data of the transformer access point. And the first calculation module is used for calculating the first reactive power before the load step and the second reactive power after the load step based on the first power operation data and the second power operation data. The first moment determining module is used for determining the starting moment of the step response time based on the actual reactive power of the load and the first reactive power and the second reactive power, and determining the ending moment of the step response time based on the actual reactive power of the load and a preset power range. And the first time determining module is used for determining the dynamic reactive compensation response time based on the starting time and the ending time. The first reactive power before load step and the second reactive power after step can be accurately obtained according to the obtained first power operation data and the second power operation data, the starting time and the ending time of the response time are regulated according to the first reactive power and the second reactive power, and the time required by the dynamic reactive compensation step response time detection process and the time required by the dynamic reactive compensation step response time test calculation instruction value can be accurately and accurately reflected.
The invention provides a calculating device of dynamic reactive compensation response time, which is applied to a power system, wherein the power system comprises: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; the second output end of the power transmission line is used for connecting a load, as shown in fig. 7, and the device includes:
a second obtaining module 701, configured to obtain first power operation data of the transformer access point. Illustratively, details of the above method step 401 are provided, and will not be repeated herein.
A second calculation module 702, configured to calculate a first power frequency amplitude before the load step and a second power frequency amplitude after the step based on the first power operation data. Illustratively, details of the method step 402 are described above, and will not be repeated here.
The second moment determining module 703 is configured to determine a start moment of the step response time based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and determine an end moment of the step response time based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage. Illustratively, the details of the method step 403 are described above, and will not be described herein.
A second time determination module 704 is configured to determine a dynamic reactive compensation response time based on the start time and the end time. Illustratively, the details of the method step 404 are described above, and will not be repeated here.
The invention provides a calculating device of dynamic reactive compensation response time, which is applied to a power system, wherein the power system comprises: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output of the power transmission line is for connecting a load, the apparatus comprising: and the second acquisition module is used for acquiring the first power operation data of the transformer access point. And the second calculation module is used for calculating a first power frequency amplitude before the load step and a second power frequency amplitude after the load step based on the first power operation data. And the second moment determining module is used for determining the starting moment of the step response time based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and determining the ending moment of the step response time based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage. And the second time determining module is used for determining the dynamic reactive compensation response time based on the starting time and the ending time.
Embodiments of the present invention also provide a computer device, as shown in fig. 8, which may include a processor 801 and a memory 802, where the processor 801 and the memory 802 may be connected by a bus or otherwise, and in fig. 8, the connection is exemplified by a bus.
The processor 801 may be a central processing unit (Central Processing Unit, CPU). The processor 801 may also be a chip such as other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination thereof.
The memory 802, as a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the method for calculating a dynamic reactive compensation response time in an embodiment of the present invention. The processor 801 executes various functional applications of the processor and data processing, i.e., implements the method of calculating the dynamic reactive compensation response time in the above-described method embodiments, by running non-transitory software programs, instructions, and modules stored in the memory 802.
Memory 802 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created by the processor 801, or the like. In addition, memory 802 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 802 may optionally include memory located remotely from processor 801, which may be connected to processor 801 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 802, which when executed by the processor 801, performs the method of calculating a dynamic reactive compensation response time in the embodiment shown in fig. 2 or fig. 4.
The details of the above-mentioned computer device may be correspondingly understood with reference to the corresponding relevant descriptions and effects in the embodiments shown in fig. 2 or fig. 4, and will not be repeated here.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment method may be implemented by a computer program to instruct related hardware, where the program may be stored in a computer readable storage medium, and the program may include the above-described embodiment method when executed. Wherein the storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.
Claims (8)
1. A method of calculating a dynamic reactive compensation response time, applied to an electrical power system, the electrical power system comprising: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output terminal of the power transmission line is used for connecting a load, wherein the method comprises:
acquiring first power operation data of the load and second power operation data of the transformer access point;
calculating a first reactive power before the load step and a second reactive power after the step based on the first and second power operation data;
determining the starting moment of the step response time based on the actual reactive power of the load and the first reactive power and the second reactive power, and determining the ending moment of the step response time based on the actual reactive power of the load and a preset power range;
determining a dynamic reactive compensation response time based on the start time and the end time;
Determining a start time of the step response time based on the actual reactive power of the load and the first reactive power and the second reactive power, and determining an end time of the step response time based on the actual reactive power of the load and a preset power range, including:
adding the first reactive power with the second reactive power based on a first preset ratio of the second reactive power to the first reactive power difference to obtain a power value of the response time at the beginning time;
obtaining the starting time of the step response time based on the power value of the starting time of the response time;
adding the second preset proportion of the preset power range and the first power difference with the first power to obtain a power value at the end time of the response time;
and obtaining the end time of the step response time based on the power value of the end time of the response time.
2. The method of calculating a dynamic reactive compensation response time according to claim 1, wherein the start time of the step response time and the end time of the step response time are calculated according to the following formula:
Q L1 +(Q L2 -Q L1 )*10％，
Q L1 +(Q S -Q L1 )×90％，
wherein Q is L1 For the first passive power, Q L2 For the second reactive power, 10% is the first preset proportion, Q S For the preset power range, 90% is the second preset ratio.
3. A method of calculating a dynamic reactive compensation response time, applied to an electrical power system, the electrical power system comprising: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output terminal of the power transmission line is used for connecting a load, wherein the method comprises:
acquiring first power operation data of the transformer access point;
calculating a first power frequency amplitude before the load step and a second power frequency amplitude after the step based on the first power operation data;
determining the starting time of the step response time based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and determining the ending time of the step response time based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage;
determining a dynamic reactive compensation response time based on the start time and the end time;
the step response time starting time is determined based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and the step response time ending time is determined based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage, and the step response time ending method comprises the following steps:
Adding a first preset proportion based on the difference between the second power frequency amplitude and the first power frequency amplitude with the first power frequency amplitude to obtain a power value of the response time at the beginning time;
obtaining the starting time of the step response time based on the power value of the starting time of the response time;
adding a second preset proportion based on the difference between the preset voltage power frequency amplitude and the initial voltage power frequency amplitude with the initial voltage power frequency amplitude to obtain the voltage power frequency amplitude at the end time of the response time;
and obtaining the end time of the step response time based on the voltage power frequency amplitude at the end time of the response time.
4. A method of calculating a dynamic reactive compensation response time according to claim 3, characterized in that the start instant of the step response time and the end instant of the step response time are calculated according to the following formula:
U 1 +(U 2 -U 1 )*10％，
Q D1 +(Q O -Q D1 )*90％，
wherein U is 1 U is the first power frequency amplitude 2 For the second power frequency amplitude, 10% is the first preset proportion, Q O To preset the power frequency amplitude of voltage, Q D1 For the power frequency amplitude of the initial voltage, 90% is the second preset proportion.
5. A computing device for dynamic reactive compensation response time, applied to a power system, the power system comprising: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output terminal of the power transmission line is used for connecting a load, characterized in that the device comprises:
The first acquisition module is used for acquiring first power operation data of the load and second power operation data of the transformer access point;
the first calculation module is used for calculating the first reactive power before the load step and the second reactive power after the load step based on the first power operation data and the second power operation data;
the first moment determining module is used for determining the starting moment of the step response time based on the actual reactive power of the load, the first reactive power and the second reactive power, and determining the ending moment of the step response time based on the actual reactive power of the load and a preset power range;
the first time determining module is used for determining dynamic reactive power compensation response time based on the starting time and the ending time;
the first time determining module is specifically configured to:
adding the first reactive power with the second reactive power based on a first preset ratio of the second reactive power to the first reactive power difference to obtain a power value of the response time at the beginning time;
obtaining the starting time of the step response time based on the power value of the starting time of the response time;
adding the second preset proportion of the preset power range and the first power difference with the first power to obtain a power value at the end time of the response time;
And obtaining the end time of the step response time based on the power value of the end time of the response time.
6. A computing device for dynamic reactive compensation response time, applied to a power system, the power system comprising: the dynamic reactive power compensation device is connected with a first output end of the power transmission line through a transformer; a second output terminal of the power transmission line is used for connecting a load, characterized in that the device comprises:
the second acquisition module is used for acquiring first power operation data of the transformer access point;
the second calculation module is used for calculating a first power frequency amplitude before the load step and a second power frequency amplitude after the load step based on the first power operation data;
the second moment determining module is used for determining the starting moment of the step response time based on the power frequency amplitude of the actual voltage of the load and the first power frequency amplitude and the second power frequency amplitude, and determining the ending moment of the step response time based on the power frequency amplitude of the initial voltage of the load and the power frequency amplitude of the preset voltage;
the second time determining module is used for determining dynamic reactive power compensation response time based on the starting time and the ending time;
the second moment determining module is specifically configured to:
Adding a first preset proportion based on the difference between the second power frequency amplitude and the first power frequency amplitude with the first power frequency amplitude to obtain a power value of the response time at the beginning time;
obtaining the starting time of the step response time based on the power value of the starting time of the response time;
adding a second preset proportion based on the difference between the preset voltage power frequency amplitude and the initial voltage power frequency amplitude with the initial voltage power frequency amplitude to obtain the voltage power frequency amplitude at the end time of the response time;
and obtaining the end time of the step response time based on the voltage power frequency amplitude at the end time of the response time.
7. A computer device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the steps of the method of calculating dynamic reactive compensation response time according to any one of claims 1-4.
8. 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 of calculating a dynamic reactive compensation response time according to any one of claims 1-4.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4857821A (en) * | 1987-03-27 | 1989-08-15 | Mitsubishi Denki Kabushiki Kaisha | Reactive power compensation system |
| JP2019030052A (en) * | 2017-07-26 | 2019-02-21 | 株式会社日立製作所 | Reactive power compensation system and method |
| CN111769554A (en) * | 2020-07-07 | 2020-10-13 | 山东省产品质量检验研究院 | System and method for testing dynamic response time of reactive compensation device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4857821A (en) * | 1987-03-27 | 1989-08-15 | Mitsubishi Denki Kabushiki Kaisha | Reactive power compensation system |
| JP2019030052A (en) * | 2017-07-26 | 2019-02-21 | 株式会社日立製作所 | Reactive power compensation system and method |
| CN111769554A (en) * | 2020-07-07 | 2020-10-13 | 山东省产品质量检验研究院 | System and method for testing dynamic response time of reactive compensation device |
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