CN113991658A - Power equipment control method and device - Google Patents
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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
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00004—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the power network being locally controlled
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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
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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Abstract
The invention discloses a power equipment control method and device. Wherein, the method comprises the following steps: acquiring device types and working parameters of first power equipment and second power equipment in a target power grid, wherein the second power equipment is newly accessed to the power equipment in the target power grid; determining a resonance equivalent model when the first power equipment and the second power equipment jointly run based on the equipment type and the working parameters; and determining a target control parameter based on the resonance equivalent model, and controlling the first power equipment and the second power equipment to jointly operate according to the target control parameter, wherein the target control parameter is a control parameter which enables the frequency and the peak value of the resonance voltage to be not greater than a preset threshold value when the first power equipment and the second power equipment jointly operate. The invention solves the technical problem that the interaction interference among different power electronic devices is easy to occur because the control method cannot be updated in time when new power electronic equipment is connected into a power grid.
Description
Technical Field
The invention relates to the field of power system control, in particular to a power equipment control method and device.
Background
With the rapid development of sensitive industries such as high-precision and the like in China, the problem of power quality becomes a problem of increasing concern in the field, and various power electronic compensation devices become reliable guarantees for maintaining the normal operation of sensitive loads and ensuring the power quality requirements of important industrial parks. However, the power electronic device itself is also a harmonic source, and when a feeder branch where a sensitive load is located has multiple power electronic devices at the same time, there is a high possibility that unnecessary mutual interference is caused due to lack of corresponding coordination control among the devices, and particularly after a new power electronic device is installed, mutual interference is more likely to occur due to the fact that control methods, control parameters, configuration schemes and the like for controlling the cooperative operation of the power electronic devices cannot be updated in time. In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a power equipment control method and a power equipment control device, which at least solve the technical problem that the mutual interference among different power electronic devices is easy to occur due to the fact that the control method cannot be updated in time when new power electronic equipment is connected into a power grid.
According to an aspect of an embodiment of the present invention, there is provided a power device control method including: acquiring device types and working parameters of first power equipment and second power equipment in a target power grid, wherein the second power equipment is newly accessed to the power equipment in the target power grid; determining a resonance equivalent model when the first power equipment and the second power equipment jointly run based on the equipment type and the working parameters; and determining a target control parameter based on the resonance equivalent model, and controlling the first power equipment and the second power equipment to jointly operate according to the target control parameter, wherein the target control parameter is a control parameter which enables the frequency and the peak value of the resonance voltage to be not greater than a preset threshold value when the first power equipment and the second power equipment jointly operate.
Optionally, the resonance equivalent model is composed of an equivalent impedance model and an equivalent current source model, and determining the target control parameter based on the joint operation equivalent model includes: determining a first expression of resonance voltage output by the first power equipment and the second power equipment when the first power equipment and the second power equipment are operated jointly based on the resonance equivalent model, wherein the first expression is used for reflecting the relation among the resonance voltage, impedance output by the equivalent impedance model and current output by the equivalent current source model; determining a second expression corresponding to the frequency of the resonance voltage and a third expression corresponding to the amplitude of the resonance voltage based on the first expression; and determining the target control parameter based on the second expression and the third expression.
Optionally, determining an output impedance equivalent model when the first power equipment and the second power equipment jointly run based on the equipment type and the working parameters; and determining a resonance equivalent model when the first power device and the second power device jointly run based on the output impedance equivalent model.
Optionally, determining an output impedance equivalent model when the first power device and the second power device operate jointly comprises: determining a joint operation topological model when the first electric power equipment and the second electric power equipment are in joint operation, wherein the joint operation topological model is used for showing a connection mode between the first electric power equipment and the second electric power equipment; determining an output impedance equivalent impedance model of each of the first and second electrical devices, wherein the output impedance equivalent impedance model of each of the first and second electrical devices consists of at least one of: an equivalent voltage source, an equivalent current source and an equivalent impedance; and determining an output impedance equivalent model when the first power equipment and the second power equipment jointly run based on the equivalent impedance models of the first power equipment and the second power equipment and the joint operation topological model.
Optionally, determining the output impedance equivalent impedance model of each of the first and second power devices comprises: determining an equivalent model of each of the first and second power devices, wherein the equivalent model is composed of at least one of: the equivalent voltage source, the equivalent current source, the equivalent resistance, the equivalent inductance and the equivalent capacitance; determining a joint operation equivalent model of the first power equipment and the second power equipment according to the joint operation topological model and the equivalent model; determining an equivalent model of a power supply in a target power grid and an equivalent model of a load in the target power grid; determining an equivalent impedance model of the first power equipment according to the equivalent model of the first power equipment and the equivalent model of the power supply; and determining an equivalent impedance model of the second power equipment according to the equivalent model of the second power equipment and the equivalent model of the load.
Optionally, the device types of the first power device and the second power device include a dynamic voltage restorer DVR and an active power filter APF, wherein when the target power grid includes a plurality of APF devices connected in parallel to the target power grid, the plurality of APF devices connected in parallel to the power grid are equivalent to the target APF device, and the power of the target APF device is equal to the sum of the powers of the plurality of APF devices connected in parallel to the power grid.
Optionally, when the first and second power devices operating in conjunction are DVR and APF devices operating in conjunction, the target control parameter is a control parameter that increases active damping of the DVR device.
According to another aspect of the embodiments of the present invention, there is also provided a power equipment control apparatus, including: the acquisition module is used for acquiring the device types and working parameters of first power equipment and second power equipment in a target power grid, wherein the second power equipment is newly connected into the target power grid; the processing module is used for determining a resonance equivalent model when the first power equipment and the second power equipment jointly run based on the equipment type and the working parameters; and the control module is used for determining a target control parameter based on the resonance equivalent model and controlling the first power equipment and the second power equipment to jointly operate according to the target control parameter, wherein the target control parameter is a control parameter which enables the frequency and the peak value of the resonance voltage to be not greater than a preset threshold value when the first power equipment and the second power equipment jointly operate.
According to another aspect of the embodiments of the present invention, there is also provided a nonvolatile storage medium including a stored program, the program controlling a device in which the nonvolatile storage medium is located to execute the power device control method when the program is executed.
According to another aspect of the embodiments of the present invention, there is also provided a processor, where the processor is configured to run a program, and the program executes the power device control method when running.
In the embodiment of the invention, the device types and the working parameters of a first power device and a second power device in a target power grid are obtained, wherein the second power device is a power device newly connected to the target power grid; determining a resonance equivalent model when the first power equipment and the second power equipment jointly run based on the equipment type and the working parameters; the method comprises the steps of determining target control parameters based on a resonance equivalent model, controlling the first power equipment and the second power equipment to run jointly according to the target control parameters, wherein the target control parameters are in a mode that the frequency and the peak value of resonant voltage are not larger than the control parameters of a preset threshold value when the first power equipment and the second power equipment run jointly, determining the optimal control parameters during parallel running based on the equipment type and the working parameters of the power equipment, achieving the purpose of reducing the resonant voltage during the joint running of the power equipment, achieving the technical effect of reducing mutual interference between different power electronic devices during parallel running, and further solving the technical problem that the mutual interference between different power electronic devices is easy to occur due to the fact that a control method cannot be updated timely when new power electronic equipment is connected into a power grid.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic flow chart of a power equipment control method according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a topology model operating in conjunction, in accordance with an embodiment of the present invention;
FIG. 3 is a circuit diagram of a co-operating equivalent model according to an embodiment of the invention;
FIG. 4 is a circuit diagram of an output impedance model at runtime in combination according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a resonance equivalent model according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a power equipment control device according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present invention, there is provided a method embodiment of a power device control method, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 1 is a power equipment control method according to an embodiment of the present invention, which is operable in a control apparatus of a target power grid, as shown in fig. 1, wherein the control apparatus is configured to control a plurality of power electronic devices in the target power grid to cooperatively operate, and includes the steps of:
step S102, acquiring device types and working parameters of first power equipment and second power equipment in a target power grid, wherein the second power equipment is newly connected to the target power grid;
in some embodiments of the present application, a communication chip may be integrated in the first power device and the second power device, and the communication chip may transmit a device type, an operating parameter, a mode of accessing to a power grid, and the like of the power device to a control device in a target power grid, where the operating parameter at least includes an operating current, an operating voltage, an output impedance, and the like of the corresponding power device.
In some embodiments of the present application, the control device stores equivalent models corresponding to electrical devices of different device types, where the equivalent models are obtained by equivalently replacing different electrical devices with a plurality of basic electrical components in a circuit diagram, where the basic electrical components at least include an impedance element, a current source, a voltage source, and the like.
Step S104, determining a resonance equivalent model when the first power equipment and the second power equipment jointly run based on the equipment type and the working parameters;
in some embodiments of the present application, based on the device type and the operating parameter, a specific procedure for determining the resonance equivalent model when the first power device and the second power device operate jointly is as follows: determining a first output impedance model corresponding to the first power device and a second output impedance model corresponding to the second power device based on the device type and the operating parameters; determining an output impedance equivalent model when the first power equipment and the second power equipment jointly run according to the first output impedance model and the second output impedance model; and determining a resonance equivalent model when the first power device and the second power device jointly run based on the output impedance equivalent model.
In some embodiments of the present application, a method of determining an output impedance equivalent model of a first power device and a second power device when operating in conjunction comprises: determining a joint operation topological model when the first electric power equipment and the second electric power equipment are in joint operation, wherein the joint operation topological model is used for showing a connection mode between the first electric power equipment and the second electric power equipment; determining an output impedance equivalent impedance model for each of the first and second electrical devices, wherein the output impedance model is comprised of at least one of: an equivalent voltage source, an equivalent current source and an equivalent impedance; and determining an output impedance equivalent model when the first power equipment and the second power equipment jointly run based on the equivalent impedance models of the first power equipment and the second power equipment and the joint operation topological model.
In some embodiments of the present application, when determining the joint operation topology model, the control device may use a topology model corresponding to a manner in which the plurality of power devices are actually connected to the power grid as the topology model in the joint operation.
In other embodiments of the present application, the control device may further determine, based on the device types of the multiple power devices, ways of accessing different power devices into the power grid, determine a topology model corresponding to each access way, and then determine a resonant frequency and an amplitude corresponding to the different topology models, thereby determining, from the multiple topology models, a topology model that can achieve a minimum resonant frequency and amplitude.
In some embodiments of the present application, in order to determine an output impedance equivalent impedance model of each of the first and second electrical devices, it is necessary to determine an equivalent model of each of the first and second electrical devices, wherein the equivalent model consists of at least one of: the equivalent voltage source, the equivalent current source, the equivalent resistance, the equivalent inductance and the equivalent capacitance; determining an equivalent model of a power supply in a target power grid and an equivalent model of a load in the target power grid; determining an equivalent impedance model of the first power equipment according to the equivalent model of the first power equipment and the equivalent model of the power supply; and determining an equivalent impedance model of the second power equipment according to the equivalent model of the second power equipment and the equivalent model of the load.
And S106, determining a target control parameter based on the resonance equivalent model, and controlling the first power equipment and the second power equipment to jointly operate according to the target control parameter, wherein the target control parameter is a control parameter which enables the frequency and the peak value of the resonance voltage to be not greater than a preset threshold value when the first power equipment and the second power equipment jointly operate.
In some embodiments of the present application, before determining the target control parameter based on the resonance equivalent model, a suitable control method for the combined operation of different power devices may also be determined based on the resonance model. The control method is a control parameter which enables the frequency and the peak value of the resonant voltage of the plurality of power equipment to be not greater than a preset threshold value when the plurality of power equipment are operated in a combined mode.
Specifically, when different control methods are adopted, the impedance values output by the corresponding output impedance models when the plurality of power devices operate in combination are not the same. The control apparatus may determine an output impedance model corresponding to each control method based on different control methods stored in advance, and then select any one of the output impedance models to analyze a relationship between the output impedance and the resonance, thereby determining a control method that can achieve the minimum resonance.
In some embodiments of the application, when the control method for minimizing resonance determined in the above steps still fails to satisfy that both the frequency and the amplitude of resonance when the multiple power devices operate in a combined manner are smaller than the preset threshold, the control device may send a prompt message to the operation and maintenance staff to prompt the operation and maintenance staff to replace the second power device or the first power device accessed to the target power grid.
In some embodiments of the present application, the resonance equivalent model is composed of an equivalent impedance model and an equivalent current source model, and the method for determining the target control parameter based on the joint operation equivalent model includes: determining a first expression of resonance voltage output by the first power equipment and the second power equipment when the first power equipment and the second power equipment are operated jointly based on the resonance equivalent model, wherein the first expression is used for reflecting the relation among the resonance voltage, impedance output by the equivalent impedance model and current output by the equivalent power model; determining a second expression corresponding to the frequency of the resonance voltage and a third expression corresponding to the amplitude of the resonance voltage based on the first expression; and determining the target control parameter based on the second expression and the third expression.
In some embodiments of the present application, the target control parameter includes, in addition to a control parameter when a plurality of power devices are operated in combination, a control parameter when each power device is individually regulated.
In some embodiments of the present application, after determining the influence factors affecting the resonant frequency and amplitude of the output when the multiple power devices operate jointly based on the resonance equivalent model, the power devices themselves may be optimized on a hardware level based on the influence factors, for example, the impedance values of the power devices themselves are changed.
In some embodiments of the present application, the device types of the first power device and the second power device include a dynamic voltage restorer DVR and an active power filter APF, wherein, when the target power grid includes a plurality of APF devices connected in parallel to the target power grid, the plurality of APF devices connected in parallel to the power grid are equivalent to the target APF device, and the power of the target APF device is equal to the sum of the respective powers of the plurality of APF devices connected in parallel to the power grid.
In some embodiments of the present application, when the first and second power devices operating in concert are DVR devices and APF devices operating in concert, the target control parameter may be a control parameter that increases active damping of the DVR device.
To facilitate understanding of the above process for determining the target control parameter, the above method is further explained below with reference to a specific example:
assuming that the target power grid is a power grid in which the DVR device and the APF device jointly operate when a new power device intervenes in the target power grid, the control device may generate the topology model in which the DVR device and the APF device jointly operate as shown in fig. 2 after receiving the device type and the operating parameter sent by the power device in the target power grid, where is、iLRespectively representing the grid side and load side currents. Vs、VLThe voltages on the grid side and the load side are indicated. L is1、R1、C1Respectively representing the filter inductance, equivalent inductance resistance and filter capacitance, L, of DVR2、R2Connecting reactor and resistance, i, respectively, representing APF1、i2Respectively, the filter inductor currents of DVR and APF. And the sensitive load end is a mixed load of linear and nonlinear.
When voltage fluctuation occurs in the power grid, such as drop of Vs, the DVR is switched from a bypass state to an operation state, and corresponding compensation voltage Vc is injected, so that the sensitive load voltage VL at the load end is maintained in a normal range. The APF is always in a compensation state, and at the moment, the control equipment can enable the converters of the DVR and the APF to be equivalent to an ideal voltage source E1、E2Thereby, is atOn the basis of fig. 2, a joint operation equivalent model as shown in fig. 3 is obtained.
After obtaining the equivalent model of joint operation shown in fig. 3, the control device may determine the output impedance models corresponding to the DVR device and the APF device, respectively, based on the current operating conditions of the two devices, and then obtain the output impedance models of joint operation shown in fig. 4 by combining the output impedance models corresponding to the two devices, respectively, based on fig. 3. Wherein the load voltage V in FIG. 4 is when the control device controls the DVR device using an open-loop control strategyL＝u1-Z1isEquivalent voltage source
Equivalent output impedance of DVR device
Output impedance Z of APF deviceapf＝L2S+R2+Kp2+Ki2S, current source iapfThe output current is set by the control device according to actual needs.
In some embodiments of the present application, controlling the device on may determine the effect the power device itself may have on the resonance based on the device type of the power device. For example, in the case of an APF device, although the APF is a compensation device for improving the quality of current and power, due to its own power electronic device and its inherent dead zone effect, the nonlinear characteristics of the devices all cause certain harmonic currents; meanwhile, the APF is digitally controlled, so that certain time delay exists in the control links of sampling, detection operation, compensation and the like, and certain harmonic wave residue exists in the compensated power grid current.
For the dead zone effect of the APF equipment, the proportion of the dead zone time of a single APF in the switching period is small, but when a plurality of devices are connected in parallel, low-order harmonic accumulation caused by the dead zone factor cannot be ignored, and the loss of the output voltage waveform caused by the dead zone effect and the non-ideal characteristics of the devices is approximated by average error voltage, namely, the loss is equivalent to a harmonic voltage disturbance quantity with constant amplitude and the direction determined by the alternating current of the converter.
The influence of the hysteresis effect of the APF on the compensation performance of the APF device is that the harmonic current compensated by the digitally controlled APF has a certain phase lag compared with the harmonic current on the load side, and the phase lag is caused by the inherent defects of the digital control and hardware, and can be specifically divided into the following three aspects:
1) in a load side current detection link, a load current detected by a current sensor according to an electromagnetic induction principle has certain phase lag relative to an actual load current.
2) In the stage of extracting the harmonic current by the APF, since the digital controller (for example, DSP) of the APF needs at least one sampling period of operation time, and a certain time is needed for the PWM converter to establish the voltage itself, it is likely that the angles of d/q conversion and q/d conversion in the algorithm are changed, thereby causing the delay of the detected current.
3) In the current compensation stage of the APF, due to the dead-time effect of the switching tube and the influence of factors such as conduction and turn-off, the compensation current has a certain lag.
Taking a nonlinear load of a three-phase rectifier bridge as an example, the amplitude of an AC side square wave is set as IdThrough Fourier decomposition, the a-phase nonlinear load current i can be obtainedLaCan be expressed as:
iLa＝I1 sinωt-I5 sin 5ωt-I7 sin 7ωt+I11 sin 11ωt
+I13 sin 13ωt-I17 sin 17ωt-I19 sin 19ωt+…
wherein the fundamental wave and the nth harmonic amplitude expressions are respectively as follows:
if the phase lag of the current of the APF output is delta t and the current harmonic wave caused by the dead zone effect of the APF output is not considered, the nth harmonic current i of the APF outputcanCan be expressed as:
ican＝In sin nω(t-Δt)
compensating the n-th residual harmonic i on the side of the rear power gridsanCan be expressed as:
the proportion of n-th residual harmonic wave to the amplitude of the load fundamental wave current is MIsan：
As can be seen from the expression of the proportion of the n-th order residual harmonic to the amplitude of the load fundamental current, the residual harmonic current has a large correlation with the delay time. Assuming that the delay time is within 300 μ s, the amplitude of the low harmonic residual current will increase with increasing delay time Δ t, while the amplitude of the high harmonic current will fluctuate with increasing delay time.
In some embodiments of the present application, based on the above analysis of the APF device, it can be determined that when the DVR device and the APF device operate in combination, the APF compensates the nonlinear load, so that a certain harmonic residual exists in the grid-side current, and especially when the number of the APFs connected in parallel is large, the cumulative effect of the injected harmonic current will have a serious influence on the compensation effect of the DVR. If the non-linear part of the mixed load is equivalent to the current source iL2, the output impedance model in combined operation can be obtained as shown in fig. 4, in which the linear load Z of the sensitive load is mixedL1＝Rz+LzS，ZL2Representing a non-linear load, equivalently a current source iL2。
Further, on the basis of fig. 2 to 4, the control device may obtain a resonance equivalent model as shown in fig. 5, wherein the equivalent harmonic current source i2s in fig. 5 is i2s＝iapf+iL2Admittance Y1、Y2Respectively with impedance Z1、Z2Correspondingly, the expressions are respectively:
impedance Y in FIG. 51And Y2Forming a new parallel system, if the total impedance after parallel connection is set as ZhThen by a current source i2sThe induced resonance voltage can be expressed as
From the above expression of the resonance voltage, it can be seen that if Y is1And Y2When the amplitude is nearly equal and the phase is nearly opposite at a certain frequency, the total parallel equivalent admittance is minimum, and the circuit is at a harmonic source i2sThe excitation of the transformer causes quasi-resonance, even leads to load voltage distortion when the excitation is serious, and the system is unstable.
After the above analysis, the control device may determine that the resonant frequency, peak value in the target grid is mainly dependent on the resonant frequency, peak value of the DVR output impedance in case of the combined operation of the DVR device and the APF device. Therefore, the influence of resonance on the load voltage can be reduced from the aspects of harmonic source and DVR output impedance.
Harmonic source aspect: delay effects caused by APF detection, compensation and the like, dead zone effects of switching devices and non-ideal characteristics can cause harmonic currents to appear on the power grid side, so that the influence of equivalent harmonic current sources can be effectively reduced by improving the APF detection algorithm and adopting various control algorithms for compensating nonlinear factors.
Output impedance aspect: when the DVR adopts open loop control, the resonance peak value of the output impedance of the DVR is larger, so that measures can be adopted to increase the damping of the DVR output filter, including the passive damping of hardware and the active damping corresponding to various improved control algorithms, thereby effectively reducing the resonance peak value of the system resonance.
Through the steps, the purpose of reducing the resonance voltage of the power equipment during combined operation can be achieved, so that the technical effect of reducing mutual interference between different power electronic devices during parallel operation is achieved, and the technical problem that the mutual interference between different power electronic devices is easy to occur due to the fact that a control method cannot be updated in time when new power electronic equipment is connected into a power grid is solved.
Example 2
According to an embodiment of the present invention, there is provided an apparatus embodiment of a power equipment control device, which is operable in the control apparatus described in embodiment 1, as shown in fig. 6, and includes: the acquisition module 60 is configured to acquire device types and working parameters of a first power device and a second power device in a target power grid, where the second power device is a power device newly connected to the target power grid; a processing module 62, configured to determine, based on the device type and the operating parameter, a resonance equivalent model when the first power device and the second power device operate jointly; and a control module 64, configured to determine a target control parameter based on the resonance equivalent model, and control the first power device and the second power device to jointly operate according to the target control parameter, where the target control parameter is a control parameter that makes both a frequency and a peak value of a resonance voltage of the first power device and the second power device jointly operate be not greater than a preset threshold.
Since the apparatus described in embodiment 2 can be used to perform the method described in embodiment 1, the explanation in embodiment 1 is also applicable to embodiment 1, and thus is not repeated herein.
Example 3
According to an embodiment of the present invention, there is provided a nonvolatile storage medium including a stored program, the program controlling a device in which the nonvolatile storage medium is located when running to execute the following power device control method: acquiring device types and working parameters of first power equipment and second power equipment in a target power grid, wherein the second power equipment is newly accessed to the power equipment in the target power grid; determining a resonance equivalent model when the first power equipment and the second power equipment jointly run based on the equipment type and the working parameters; and determining a target control parameter based on the resonance equivalent model, and controlling the first power equipment and the second power equipment to jointly operate according to the target control parameter, wherein the target control parameter is a control parameter which enables the frequency and the peak value of the resonance voltage to be not greater than a preset threshold value when the first power equipment and the second power equipment jointly operate.
According to an embodiment of the present invention, there is provided a processor configured to execute a program, where the program executes the following power device control method when executed: acquiring device types and working parameters of first power equipment and second power equipment in a target power grid, wherein the second power equipment is newly accessed to the power equipment in the target power grid; determining a resonance equivalent model when the first power equipment and the second power equipment jointly run based on the equipment type and the working parameters; and determining a target control parameter based on the resonance equivalent model, and controlling the first power equipment and the second power equipment to jointly operate according to the target control parameter, wherein the target control parameter is a control parameter which enables the frequency and the peak value of the resonance voltage to be not greater than a preset threshold value when the first power equipment and the second power equipment jointly operate.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An electric power equipment control method characterized by comprising:
acquiring device types and working parameters of first power equipment and second power equipment in a target power grid, wherein the second power equipment is newly accessed to the power equipment in the target power grid;
determining a resonance equivalent model of the first and second power devices when operating in combination based on the device type and the operating parameters;
and determining a target control parameter based on the resonance equivalent model, and controlling the first power equipment and the second power equipment to jointly operate according to the target control parameter, wherein the target control parameter is a control parameter which enables the frequency and the peak value of the resonance voltage to be not greater than a preset threshold value when the first power equipment and the second power equipment jointly operate.
2. The method of claim 1, wherein the resonance equivalent model consists of an equivalent impedance model and an equivalent current source model, and wherein determining target control parameters based on the joint operational equivalent model comprises:
determining a first expression of a resonance voltage output by the first power equipment and the second power equipment when the first power equipment and the second power equipment jointly run based on the resonance equivalent model, wherein the first expression is used for reflecting the relation among the resonance voltage, the impedance output by the equivalent impedance model and the current output by the equivalent current source model;
determining a second expression corresponding to a frequency of the resonance voltage and a third expression corresponding to an amplitude of the resonance voltage based on the first expression;
determining the target control parameter based on the second expression and the third expression.
3. The method of claim 2, wherein determining a resonance equivalent model for the first and second power devices when operating in conjunction based on the device type and the operating parameters comprises:
determining an output impedance equivalent model of the first power device and the second power device when jointly operating based on the device type and the operating parameters;
determining a resonance equivalent model of the first and second power devices when operating in conjunction based on the output impedance equivalent model.
4. The method of claim 3, wherein determining an output impedance equivalent model of the first and second power devices when operating in conjunction comprises:
determining a joint operation topological model when the first electric power equipment and the second electric power equipment are operated jointly, wherein the joint operation topological model is used for showing a connection mode between the first electric power equipment and the second electric power equipment;
determining an output impedance equivalent impedance model for each of the first and second electrical devices, wherein the output impedance equivalent impedance model for each of the first and second electrical devices is comprised of at least one of: an equivalent voltage source, an equivalent current source and an equivalent impedance;
determining an output impedance equivalent model when the first power device and the second power device operate jointly based on the equivalent impedance models of the first power device and the second power device, respectively, and the joint operation topology model.
5. The method of claim 4, wherein determining the output impedance equivalent impedance model for each of the first and second power devices comprises:
determining respective equivalent models of the first and second electrical devices, wherein the equivalent models consist of at least one of: the equivalent voltage source, the equivalent current source, the equivalent resistance, the equivalent inductance and the equivalent capacitance;
determining an equivalent model of a power supply in the target power grid and an equivalent model of a load in the target power grid;
determining an equivalent impedance model of the first power equipment according to the equivalent model of the first power equipment and the equivalent model of the power supply; and the number of the first and second groups,
and determining an equivalent impedance model of the second power equipment according to the equivalent model of the second power equipment and the equivalent model of the load.
6. The method according to claim 1, wherein the device types of the first power device and the second power device comprise a Dynamic Voltage Restorer (DVR) and an Active Power Filter (APF), wherein when a plurality of APF devices which are connected into the target power grid after being connected in parallel are included in the target power grid, the APF devices are equivalent to the target APF devices, and wherein the power of the target APF devices is equal to the sum of the respective powers of the APF devices which are connected into the power grid after being connected in parallel.
7. The method of claim 6, wherein the target control parameter is a control parameter that increases active damping of the DVR device when the first and second jointly operating power devices are jointly operating DVR devices and APF devices.
8. An electric power equipment control device, characterized by comprising:
the acquisition module is used for acquiring the device types and working parameters of first power equipment and second power equipment in a target power grid, wherein the second power equipment is newly connected into the target power grid;
a processing module for determining a resonance equivalent model of the first and second power devices when operating in combination based on the device type and the operating parameters;
and the control module is used for determining a target control parameter based on the resonance equivalent model and controlling the first power equipment and the second power equipment to jointly operate according to the target control parameter, wherein the target control parameter is a control parameter which enables the frequency and the peak value of the resonance voltage to be not greater than a preset threshold value when the first power equipment and the second power equipment jointly operate.
9. A non-volatile storage medium, characterized in that the non-volatile storage medium includes a stored program, wherein a device in which the non-volatile storage medium is located is controlled to execute the power device control method according to any one of claims 1 to 7 when the program is executed.
10. A processor, characterized in that the processor is configured to execute a program, wherein the program executes the power device control method according to any one of claims 1 to 7.
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