CN111541250A - Local control method and system of voltage detection type APF - Google Patents

Local control method and system of voltage detection type APF Download PDF

Info

Publication number
CN111541250A
CN111541250A CN202010288930.7A CN202010288930A CN111541250A CN 111541250 A CN111541250 A CN 111541250A CN 202010288930 A CN202010288930 A CN 202010288930A CN 111541250 A CN111541250 A CN 111541250A
Authority
CN
China
Prior art keywords
harmonic
conductance
detection type
voltage detection
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010288930.7A
Other languages
Chinese (zh)
Inventor
贾清泉
林丽娟
王宁
石磊磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yanshan University
Original Assignee
Yanshan University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yanshan University filed Critical Yanshan University
Priority to CN202010288930.7A priority Critical patent/CN111541250A/en
Publication of CN111541250A publication Critical patent/CN111541250A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20—Active power filtering [APF]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to a local control method and a local control system of a voltage detection type APF. The method comprises the following steps: dividing the power grid into a plurality of control areas by taking a node where each voltage detection type APF in the power grid is located as a center; acquiring the fluctuation range of harmonic pollution source injection harmonic current in each control area and the local running characteristic of a preset voltage detection type APF; according to the fluctuation range and the local operation characteristic, determining the optimal harmonic conductance regulating quantity of the voltage detection type APF in each control area by taking the harmonic distortion of each node in the control area not to be out of limit as a constraint condition and taking the minimum harmonic conductance regulating quantity of each time as a target function; and adjusting the conductance value of the voltage detection type APF in each control area according to the optimal harmonic conductance adjustment quantity so as to control the voltage detection type APF. The local control method and the local control system of the voltage detection type APF provided by the invention can achieve a good treatment effect while visually reflecting node harmonic distortion information.

Description

Local control method and system of voltage detection type APF
Technical Field
The invention relates to the technical field of power system harmonic suppression, in particular to a local control method and system of a voltage detection type APF.
Background
With the large-scale penetration of distributed power generation and power electronic electric equipment containing converters into a power distribution network and the rapid development and application of power grid control equipment such as alternating current-direct current power grid converters and power electronic transformers, the modern power distribution network presents a remarkable power electronization trend. Harmonic emission of a single power electronic device in the power electronic distribution network is relatively limited and can be regarded as a micro-harmonic source; however, the superposition of a large number of micro-harmonic sources can seriously increase the harmonic pollution degree, so that the pollution has the characteristics of high density, decentralization and full networking.
The traditional power grid harmonic sources are few and high in concentration, and an active filter is often adopted to realize point-to-point treatment at a user side. Due to the fact that a large number of microwave sources exist in the power electronic power grid, not only are new conditions on the number and distribution extent, but also the dynamics and uncertainty of harmonic distribution are remarkably increased, and the point-to-point treatment of a large number of microwave sources is obviously not feasible. Therefore, it is necessary to search a new means to solve the harmonic problem caused by the power electronization of the distribution network from the grid-side system.
Different from a traditional voltage detection type Active Power Filter (APF), the working characteristic of the voltage detection type APF is to detect the harmonic voltage of an access point and make the APF show the conductance characteristic on the harmonic frequency, and the harmonic voltage of the access node is used as a reference signal to calculate the APF injection current according to the set conductance value. The core idea of the voltage detection type APF is to convert harmonic voltage into command current by introducing control gain, and the gain has a conductance dimension. Thus, the voltage detection type APF is equivalent to providing a harmonic current conduction path between the grid and the ground in terms of external characteristics, and the existence of the path enables harmonic current to be effectively released, so that voltage distortion is corrected.
The prior art generally establishes a first linear relationship of voltage detection type APF harmonic power-harmonic conductance. Each APF in the voltage detection type APF shares a harmonic wave treatment task in proportion according to the total capacity, and actually, the harmonic wave power-harmonic wave conductance first-order relation of the voltage detection type APF established in the prior art cannot visually reflect node harmonic wave distortion information, and the harmonic wave has a local characteristic, so that the proportional sharing cannot achieve a good treatment effect.
Therefore, it is a technical problem to be solved in the art to provide a local control method for a voltage detection type APF, which can intuitively reflect node harmonic distortion information and achieve a good treatment effect.
Disclosure of Invention
The invention aims to provide a local control method and a local control system of a voltage detection type APF (active power filter), which can achieve a good treatment effect while visually reflecting node harmonic distortion information.
In order to achieve the purpose, the invention provides the following scheme:
a local control method of a voltage detection type APF includes:
dividing a power grid into a plurality of control areas by taking a node where each voltage detection type APF in the power grid is located as a center; the control node of the control area is an access node of the voltage detection type APF, and the controlled node of the control area is a node which is not accessed to the voltage detection type APF;
acquiring the fluctuation range of harmonic pollution source injection harmonic current in each control area and the preset local running characteristic of the voltage detection type APF; the local operating characteristic is a raising characteristic between harmonic conductance and harmonic voltage;
according to the fluctuation range and the local operation characteristic, determining the optimal harmonic conductance regulating quantity of the voltage detection type APF in each control region by taking the harmonic distortion of each node in the control region not to be out of limit as a constraint condition and taking the minimum harmonic conductance regulating quantity of each time as a target function;
and adjusting the conductance value of the voltage detection type APF in each control area according to the optimal harmonic conductance adjustment quantity so as to control the voltage detection type APF.
Preferably, the dividing the power grid into a plurality of control areas by taking a node where each voltage detection type APF in the power grid is located as a center specifically includes:
obtaining the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node;
determining the sensitivity of the harmonic voltage to the virtual harmonic conductance according to the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node, and constructing a sensitivity matrix according to the sensitivity;
and acquiring the maximum sensitivity value of each row of elements in the sensitivity matrix, and distributing the controlled node corresponding to the harmonic voltage with the maximum sensitivity value to the control area where the control node corresponding to the virtual harmonic conductance with the maximum sensitivity value is located.
Preferably, the uplift characteristic is as follows:
Figure RE-GDA0002538456390000031
in the formula (I), the compound is shown in the specification,
Figure RE-GDA0002538456390000032
for voltage detection type APFiCommand harmonic conductance of (G)0As a harmonic conductance reference value, biFor degree of conductivity adjustment, Uh,i0For voltage detection type APFiMaximum harmonic voltage value, U, allowed at the nodeh,iFor voltage detection type APFiThe actual harmonic voltage value of the node at which it is located.
Preferably, the determining, according to the fluctuation range and the local operating characteristic, the optimal harmonic conductance adjustment amount of the voltage detection type APF in each control region by using non-overrun harmonic distortion of each node in the control region as a constraint condition and using the minimum harmonic conductance adjustment amount of each subharmonic as an objective function specifically includes:
detecting a harmonic voltage of the control node with a local controller;
determining a harmonic conductance value of the control node according to the harmonic voltage;
and acquiring a harmonic conductance reference value, and determining the optimal harmonic conductance regulating quantity according to the harmonic conductance value and the harmonic conductance reference value.
Preferably, the adjusting the conductance value of the voltage detection type APF in each control region according to the optimal harmonic conductance adjustment amount to control the voltage detection type APF specifically includes:
obtaining a harmonic voltage value before disturbance of a control node and a harmonic voltage value after disturbance;
determining the minimum value of the harmonic conductance regulation degree according to the optimal harmonic conductance regulation quantity, the harmonic voltage value of the control node before disturbance and the harmonic voltage value after disturbance;
and adjusting the conductance value of the voltage detection type APF in each control area according to the minimum value of the harmonic conductance adjustment degree so as to control the voltage detection type APF.
Preferably, the constraint conditions are:
Uh≤Uhmax
THDV≤THDVmax；
in the formula of UhFor h harmonic voltage of the controlled node, UhmaxH-order harmonic voltage U of controlled nodehMaximum value of, THDVFor total distortion rate of voltage, THDVmaxAs a total distortion rate of the voltage THDVMaximum value of (d);
the objective function is f:
f＝minΔGi
in the formula,. DELTA.GiFor voltage detection type APFiThe amount of harmonic conductance regulation.
A local control system of a voltage detection type APF, comprising:
the control area division module is used for dividing the power grid into a plurality of control areas by taking a node where each voltage detection type APF in the power grid is located as a center; the control node of the control area is an access node of the voltage detection type APF, and the controlled node of the control area is a node which is not accessed to the voltage detection type APF;
the acquisition module is used for acquiring the fluctuation range of harmonic pollution source injection harmonic current in each control area and the preset local operation characteristic of the voltage detection type APF; the local operating characteristic is a raising characteristic between harmonic conductance and harmonic voltage;
an optimal harmonic conductance regulating quantity determining module, configured to determine an optimal harmonic conductance regulating quantity of the voltage detection type APF in each control region according to the fluctuation range and the local operating characteristic, with non-off-limit harmonic distortion of each node in the control region as a constraint condition, and with a minimum subharmonic conductance regulating quantity as a target function;
and the conductance value adjusting module is used for adjusting the conductance value of the voltage detection type APF in each control area according to the optimal harmonic conductance adjustment quantity so as to control the voltage detection type APF.
Preferably, the control region dividing module specifically includes:
the first acquisition unit is used for acquiring the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node;
the sensitivity matrix construction unit is used for determining the sensitivity of the harmonic voltage to the virtual harmonic conductance according to the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node, and constructing a sensitivity matrix according to the sensitivity;
and the control area dividing unit is used for acquiring the maximum sensitivity value of each row of elements in the sensitivity matrix and distributing the controlled node corresponding to the harmonic voltage with the maximum sensitivity value to the control area where the control node corresponding to the virtual harmonic conductance with the maximum sensitivity value is located.
Preferably, the optimal harmonic conductance adjustment amount determining module specifically includes:
a harmonic voltage detection unit for detecting a harmonic voltage of the control node by using a local controller;
the harmonic conductance value determining unit is used for determining the harmonic conductance value of the control node according to the harmonic voltage;
and the optimal harmonic conductance regulating quantity determining unit is used for acquiring a harmonic conductance reference value and determining the optimal harmonic conductance regulating quantity according to the harmonic conductance value and the harmonic conductance reference value.
Preferably, the conductance value adjusting module specifically includes:
a second acquisition unit for acquiring the control node
The harmonic voltage value before disturbance and the harmonic voltage value after disturbance;
the minimum value determining unit is used for determining the minimum value of the harmonic conductance regulation degree according to the optimal harmonic conductance regulation quantity, the harmonic voltage value of the control node before disturbance and the harmonic voltage value after disturbance;
and the conductance value adjusting unit is used for adjusting the conductance value of the voltage detection type APF in each control area according to the minimum value of the harmonic conductance adjustment degree so as to control the voltage detection type APF.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the local control method and the local control system of the voltage detection type APF provided by the invention have the advantages that the node where each voltage detection type APF in the power grid is located is taken as the center, the power grid is divided into a plurality of control areas, harmonic distortion of each node in each control area is not out of limit as a constraint condition according to the fluctuation range and the local operation characteristic, the minimum harmonic conductance regulating quantity of each sub-harmonic is taken as a target function, the optimal harmonic conductance regulating quantity of the voltage detection type APF in each control area is determined, then the conductance value of the voltage detection type APF in each control area is regulated according to the optimal harmonic conductance regulating quantity to control the voltage detection type APF, and therefore, the node harmonic distortion information can be intuitively reflected, and meanwhile, a good treatment effect is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a distributed global optimization governance scheme of a power electronic distribution network considering a harmonic governance partition and a voltage detection type APF local control method;
FIG. 2 is a basic schematic diagram of a voltage sensing APF implementation;
FIG. 3 is a schematic diagram of a voltage detection type APF command current generation and current control loop;
FIG. 4 is a circuit diagram of the equivalent circuit of the system harmonic;
fig. 5 is a flowchart of a local control method of the voltage detection type APF according to an embodiment of the present invention;
FIG. 6 is a flow chart of solving a distributed voltage detection type APF global optimization governing model of the power electronic distribution network;
FIG. 7 is a schematic diagram of the local control G-U raising regulation characteristic of the voltage detection type APF;
FIG. 8a is a diagram illustrating the situation where the THD value of the voltage-detecting APF node is close to the threshold value;
FIG. 8b is a diagram illustrating the situation where the THD value of the voltage detection type APF node is far from the limit value;
fig. 9 is a schematic structural diagram of a local control system of a voltage detection type APF according to an embodiment of the present invention.
Detailed Description
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.
The invention aims to provide a local control method and a local control system of a voltage detection type APF (active power filter), which can achieve a good treatment effect while visually reflecting node harmonic distortion information.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The local control method of the voltage detection type APF provided by the invention essentially comprises a harmonic wave governance partitioning method, and the structure of a distributed global optimization governance scheme is shown in figure 1.
The basic principle of the voltage detection type APF implementation, the APF command current generation and the current control loop principle are respectively shown in fig. 2 and fig. 3. The master station is responsible for analyzing the collected harmonic data, performing global optimization on each subharmonic conductance value of each APF, partitioning the network based on the subharmonic conductance values and setting local operation parameters of each APF.
Each voltage detection type APF is mainly responsible for the harmonic wave treatment task of the controlled node in the control area, and the network is partitioned according to the sensitivity index of the harmonic wave voltage of the controlled node to the virtual harmonic wave conductance of the control node. The system harmonic equivalent circuit is shown in fig. 4, equivalent harmonic injection of each node is represented by a norton circuit, a voltage detection type APF is represented by a ground harmonic conductance, and a large power grid side power supply branch is equivalent to a ground harmonic impedance.
The method adopts a voltage detection type APF local control method, designs the local operation of the voltage detection type APF as the raising characteristic between harmonic conductance and harmonic voltage, takes the non-out-of-limit harmonic distortion of all nodes in a control area as a constraint condition aiming at harmonic pollution time-varying, takes the minimum of each subharmonic conductance regulating quantity as a target function, and solves the optimal conductance increment of the APF, thereby determining the value of the local control conductance regulating quantity.
By using the local control method of the voltage detection type APF provided by the invention, on the basis of the overall optimization management of the harmonic wave of the power distribution network, the robust control of the node harmonic wave voltage in the control area can be realized for the harmonic wave disturbance, and a scientific overall optimization and local autonomous operation scheme is provided for the harmonic wave management of the power electronic power distribution network.
Fig. 5 is a flowchart of a local control method of a voltage detection type APF according to an embodiment of the present invention, and as shown in fig. 5, the local control method of a voltage detection type APF according to the present invention includes:
and S1, dividing the power grid into a plurality of control areas by taking the node where each voltage detection type APF in the power grid is located as the center. The control node of the control area is an access node of the voltage detection type APF, and the controlled node of the control area is a node which is not accessed to the voltage detection type APF. The method mainly comprises the step of dividing a control area by adopting a power distribution network harmonic wave treatment partitioning method.
And S2, acquiring the fluctuation range of the harmonic pollution source injection harmonic current in each control area and the preset local operation characteristics of the voltage detection type APF. The local operating characteristic is a rising characteristic between the harmonic conductance and the harmonic voltage. The raising characteristics are as follows:
Figure RE-GDA0002538456390000071
in the formula (I), the compound is shown in the specification,
Figure RE-GDA0002538456390000072
for voltage detection type APFiCommand harmonic conductance of (G)0As a harmonic conductance reference value, biFor degree of conductivity adjustment, Uh,i0For voltage detection type APFiMaximum harmonic voltage value, U, allowed at the nodeh,iFor voltage detection type APFiThe actual harmonic voltage value of the node at which it is located.
And S3, determining the optimal harmonic conductance regulating quantity of the voltage detection type APF in each control area by taking the fact that harmonic distortion of each node in the control area is not out of limit as a constraint condition according to the fluctuation range and the local operation characteristic. The constraint conditions are as follows:
Uh≤Uhmax，
THDV≤THDVmax。
in the formula of UhFor h harmonic voltage of the controlled node, UhmaxH-order harmonic voltage U of controlled nodehMaximum value of, THDVFor total distortion rate of voltage, THDVmaxAs a total distortion rate of the voltage THDVIs measured.
The objective function is f:
f＝minΔGi
in the formula,. DELTA.GiFor voltage detection type APFiThe amount of harmonic conductance regulation.
And S4, adjusting the conductance value of the voltage detection type APF in each control area according to the optimal harmonic conductance adjustment quantity so as to control the voltage detection type APF.
The distribution network main station performs global optimization on each subharmonic conductance value of the distributed voltage detection type APF based on short-term prediction and evaluation of harmonic waves and by combining the online quantity, position and capacity information of the voltage detection type APF in the power grid, and a global optimization solving flow chart of the distributed APF conductance values is shown in 6.
The S1 divides the power grid into a plurality of control areas with a node where each voltage detection type APF in the power grid is located as a center, and specifically includes:
and acquiring the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node.
And determining the sensitivity of the harmonic voltage to the virtual harmonic conductance according to the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node, and constructing a sensitivity matrix according to the sensitivity.
And acquiring the maximum sensitivity value of each row of elements in the sensitivity matrix, and distributing the controlled node corresponding to the harmonic voltage with the maximum sensitivity value to the control area where the control node corresponding to the virtual harmonic conductance with the maximum sensitivity value is located.
S3, according to the fluctuation range and the local operating characteristic, determining an optimal harmonic conductance adjustment value of the voltage detection type APF in each control region by using non-overrun harmonic distortion of each node in the control region as a constraint condition and using the minimum harmonic conductance adjustment value as an objective function, specifically including:
detecting a harmonic voltage of the control node with a local controller.
And determining the harmonic conductance value of the control node according to the harmonic voltage.
And acquiring a harmonic conductance reference value, and determining the optimal harmonic conductance regulating quantity according to the harmonic conductance value and the harmonic conductance reference value.
The value of the optimal harmonic conductance regulating quantity is an optimal solution in a certain feasible region. When the harmonic current injected by the harmonic source is disturbed, the harmonic control intensity is changed to adapt to the disturbance of the harmonic current injection by adjusting the harmonic conductance value of the voltage detection type APF. The adjustment of the harmonic conductance value needs to satisfy two constraint conditions that the node harmonic voltage is not out of limit and the node harmonic voltage distortion rate is not out of limit. The value of each sub-optimal harmonic conductance regulating quantity is the optimal solution obtained by taking a formula (5) as a harmonic power flow equality constraint, taking a formula (6) and a formula (7) as an inequality constraint and taking the minimum harmonic conductance regulating quantity as a target function, namely the optimal solution obtained under the condition that the harmonic power quality index is qualified and the harmonic conductance regulating quantity is minimum.
S4, according to the optimal harmonic conductance adjustment amount, adjusting the conductance value of the voltage detection type APF in each control region to control the voltage detection type APF, including:
and acquiring a harmonic voltage value before disturbance of the control node and a harmonic voltage value after disturbance.
And determining the minimum value of the harmonic conductance regulation according to the optimal harmonic conductance regulation, the harmonic voltage value of the control node before disturbance and the harmonic voltage value after disturbance.
And adjusting the conductance value of the voltage detection type APF in each control area according to the minimum value of the harmonic conductance adjustment degree so as to control the voltage detection type APF.
To further explain the local control method of the voltage detection type APF provided by the present invention, as another embodiment of the present invention, taking h-th dominant harmonic as an example, the sensitivity w of the harmonic voltage of any controlled node j to the equivalent conductance of the ci harmonic of the control node is definedh,j,ciIs composed of
Figure RE-GDA0002538456390000091
In the formula (1), Uh,jH harmonic voltage, G, of controlled node jh,ciTo control the equivalent conductance of node ci, wh,j,ciThe degree of change in the harmonic voltage of the controlled node j to the change in the conductance of the control node ci.
The equivalent conductance of the control node exists in the admittance matrix YnnAmong the diagonal elements of (a) the diagonal elements,
Figure RE-GDA0002538456390000101
in the formula (2), G is the diagonal elementiConnecting node i with equivalent conductance, Y, of voltage detection type APFi' removal of G from the admittance for node iiThe latter part. I ish,iA predictable known amount, Uh,iIs composed of GiA dependent variable of the decision. Solving for U by equation (2)hFor GiAccording to the partial derivative of the voltage, and according to the optimal conductance value of each voltage detection type APF obtained by global optimization, the sensitivity w is further obtainedh,j,ciThe value of (c).
Setting m control nodes and n controlled nodes in the system network, and obtaining a sensitivity matrix S of harmonic voltage of all the controlled nodes to equivalent conductance of the control nodes according to the formulas (1) and (2)U-GIs composed of
Figure RE-GDA0002538456390000102
Wherein, the sensitivity represents the coupling strength of the conductance of the control node and the harmonic voltage of the controlled node.
The invention assumes that one voltage detection type APF is enough to independently control one area by taking the voltage detection type APF reasonably arranged in the system as the area center, namely the number of the areas is the total arrangement number of the voltage detection type APFs, and m initial areas are formed. The sensitivity matrix SU-GThe rows are sorted from large to small to obtain n sequences. And distributing each controlled node to the area where the control node with the highest sensitivity is located.
The APF local control is designed as the local operation characteristic between the harmonic conductance and the harmonic voltage, and the inclination reflects the harmonic conductance increment corresponding to the harmonic voltage of the regulating unit.
The equivalent harmonic conductance of the voltage detection type APF represents the treatment strength of the voltage detection type APF on the harmonic, and the local control of the voltage detection type APF is designed to be the raising regulation characteristic, as shown in fig. 7. The voltage detection type APF is based on the rising characteristics of harmonic conductance-harmonic voltage
Figure RE-GDA0002538456390000103
Wherein Gi is the command harmonic conductance of voltage detection type APFi, G0 is the reference value of harmonic conductance, bi is the conductance regulation degree, Uh,i0For voltage detection type APFiMaximum harmonic voltage value, U, allowed at the nodeh,iFor voltage detection type APFiThe actual harmonic voltage value of the node at which it is located.
Real-time random fluctuations in the harmonic current injected by the pollution source can cause distortion fluctuations in the control node voltage, and there are two extremes, close to the limit and far from the limit, as shown in fig. 8a and 8 b. Wherein the two dotted lines represent the fluctuation range of the node voltage distortion. Local control should ensure that the treatment requirements can be met under two extreme conditions.
The disturbance quantity of harmonic current injected into a harmonic source node in a control area is set as IhWhich is typically a given quantity, can be predicted from the harmonic data. If the node i is a control node, the harmonic voltage value of each node in the region can be obtained by the propagation equation of the regional harmonic network shown in the formula (5). The invention considers the most serious condition of harmonic current disturbance quantity, namely each node IhThe maximum boundary value of the fluctuation range is taken. With the formula f ═ min Δ GiTaking the formulas (6) and (7) as constraint conditions for an objective function to obtain the optimal harmonic conductance regulating quantity delta G meeting the constrainti。
Figure RE-GDA0002538456390000111
Uh≤Uhmax(6)
THDV≤THDVmax(7)
Regulating quantity delta G according to optimal harmonic wave conductanceiThe minimum value b of the conductivity adjustment degree of the local operation characteristic at the moment can be obtainedcminComprises the following steps:
Figure RE-GDA0002538456390000112
in the formula, bcminThe degree of conductance regulation of the control node c is U 'when harmonic voltages of all nodes in the area are regulated to a limit value'hcFor controlling the value of the harmonic voltage of the node after disturbance, UhcTo control the harmonic voltage values of the nodes before disturbance.
By the voltage detection type APF local control method, the APF can dynamically adjust the self harmonic conductance value according to the actual harmonic voltage value detected by the access node to change the treatment intensity, and realize the online dynamic treatment of the harmonic in the subarea. By constructing a harmonic wave treatment partition algorithm with a voltage detection type APF access point as a reference, APF local operation control characteristics reflecting the relationship between treatment strength and harmonic wave voltage and a parameter selection method thereof, and combining with a distributed APF operation point optimization model aiming at the optimal voltage distortion index of each node of the whole network, the autonomous operation of each APF in each partition can be realized, and thus the distributed master-slave cooperative treatment of the harmonic wave of the whole network is realized.
The invention also correspondingly provides a local control system of the voltage detection type APF, which corresponds to the local control method of the voltage detection type APF. As shown in fig. 9, the system includes: the device comprises a control area division module 1, an acquisition module 2, an optimal harmonic conductance regulating quantity determination module 3 and a conductance value regulating module 4.
The control area division module 1 is configured to divide a power grid into a plurality of control areas with a node where each voltage detection type APF in the power grid is located as a center. The control node of the control area is an access node of the voltage detection type APF, and the controlled node of the control area is a node which is not accessed to the voltage detection type APF.
The obtaining module 2 is configured to obtain a fluctuation range of the harmonic pollution source injection harmonic current in each of the control regions and a preset local operating characteristic of the voltage detection type APF. The local operating characteristic is a rising characteristic between the harmonic conductance and the harmonic voltage.
And the optimal harmonic conductance regulating quantity determining module 3 is used for determining the optimal harmonic conductance regulating quantity of the voltage detection type APF in each control area according to the fluctuation range and the local operation characteristic by taking the harmonic distortion of each node in the control area not to be out of limit as a constraint condition and taking the minimum harmonic conductance regulating quantity of each time as a target function.
And the conductance value adjusting module 4 is configured to adjust the conductance value of the voltage detection type APF in each control region according to the optimal harmonic conductance adjustment amount, so as to control the voltage detection type APF.
Wherein, the control area division module 1 specifically includes: the device comprises a first acquisition unit, a sensitivity matrix construction unit and a control area division unit.
The first acquisition unit is used for acquiring the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node.
The sensitivity matrix construction unit is used for determining the sensitivity of the harmonic voltage to the virtual harmonic conductance according to the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node, and constructing a sensitivity matrix according to the sensitivity.
The control area dividing unit is used for acquiring the maximum sensitivity value of each row of elements in the sensitivity matrix and distributing the controlled node corresponding to the harmonic voltage with the maximum sensitivity value to the control area where the control node corresponding to the virtual harmonic conductance with the maximum sensitivity value is located.
The optimal harmonic conductance adjustment amount determining module 3 specifically includes: the harmonic voltage detection unit, the harmonic conductance value determination unit and the optimal harmonic conductance regulating quantity determination unit.
The harmonic voltage detection unit is used for detecting the harmonic voltage of the control node by adopting a local controller.
And the harmonic conductance value determining unit is used for determining the harmonic conductance value of the control node according to the harmonic voltage.
The optimal harmonic conductance regulating quantity determining unit is used for acquiring a harmonic conductance reference value and determining the optimal harmonic conductance regulating quantity according to the harmonic conductance value and the harmonic conductance reference value.
The conductance value adjusting module 4 specifically includes: the device comprises a second acquisition unit, a minimum value determination unit and a conductance value adjusting unit.
The second obtaining unit is used for obtaining a harmonic voltage value of the control node before disturbance and a harmonic voltage value after disturbance.
The minimum value determining unit is used for determining the minimum value of the harmonic conductance regulation degree according to the optimal harmonic conductance regulation quantity, the harmonic voltage value of the control node before disturbance and the harmonic voltage value after disturbance.
The electric conductance value adjusting unit is used for adjusting the electric conductance value of the voltage detection type APF in each control area according to the minimum value of the harmonic electric conductance adjustment degree so as to control the voltage detection type APF.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

1. A local control method of a voltage detection type APF, comprising:
dividing a power grid into a plurality of control areas by taking a node where each voltage detection type APF in the power grid is located as a center; the control node of the control area is an access node of the voltage detection type APF, and the controlled node of the control area is a node which is not accessed to the voltage detection type APF;
acquiring the fluctuation range of harmonic pollution source injection harmonic current in each control area and the preset local running characteristic of the voltage detection type APF; the local operating characteristic is a raising characteristic between harmonic conductance and harmonic voltage;
according to the fluctuation range and the local operation characteristic, determining the optimal harmonic conductance regulating quantity of the voltage detection type APF in each control region by taking the harmonic distortion of each node in the control region not to be out of limit as a constraint condition and taking the minimum harmonic conductance regulating quantity of each time as a target function;
and adjusting the conductance value of the voltage detection type APF in each control area according to the optimal harmonic conductance adjustment quantity so as to control the voltage detection type APF.
2. The local control method of the voltage detection type APF according to claim 1, wherein the dividing the power grid into a plurality of control areas with a node where each voltage detection type APF in the power grid is located as a center specifically comprises:
obtaining the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node;
determining the sensitivity of the harmonic voltage to the virtual harmonic conductance according to the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node, and constructing a sensitivity matrix according to the sensitivity;
and acquiring the maximum sensitivity value of each row of elements in the sensitivity matrix, and distributing the controlled node corresponding to the harmonic voltage with the maximum sensitivity value to the control area where the control node corresponding to the virtual harmonic conductance with the maximum sensitivity value is located.
3. The local control method of the voltage detection type APF according to claim 1, wherein the boost characteristic is:
Figure FDA0002449660380000011
in the formula (I), the compound is shown in the specification,
Figure FDA0002449660380000012
for voltage detection type APFiCommand harmonic conductance of (G)0As a harmonic conductance reference value, biFor degree of conductivity adjustment, Uh,i0For voltage detection type APFiMaximum harmonic voltage value, U, allowed at the nodeh,iFor voltage detection type APFiThe actual harmonic voltage value of the node at which it is located.
4. The local control method of a voltage detection type APF according to claim 1, wherein the determining an optimal harmonic conductance adjustment amount of the voltage detection type APF in each of the control regions according to the fluctuation range and the local operating characteristics under a constraint condition that harmonic distortion of each node in the control region is not out of limit and a target function that a harmonic conductance adjustment amount is minimum comprises:
detecting a harmonic voltage of the control node with a local controller;
determining a harmonic conductance value of the control node according to the harmonic voltage;
and acquiring a harmonic conductance reference value, and determining the optimal harmonic conductance regulating quantity according to the harmonic conductance value and the harmonic conductance reference value.
5. The local control method of a voltage-sensing APF according to claim 1, wherein the adjusting the conductance value of the voltage-sensing APF in each of the control regions according to the optimal harmonic conductance adjustment amount to control the voltage-sensing APF specifically comprises:
obtaining a harmonic voltage value before disturbance of a control node and a harmonic voltage value after disturbance;
determining the minimum value of the harmonic conductance regulation degree according to the optimal harmonic conductance regulation quantity, the harmonic voltage value of the control node before disturbance and the harmonic voltage value after disturbance;
and adjusting the conductance value of the voltage detection type APF in each control area according to the minimum value of the harmonic conductance adjustment degree so as to control the voltage detection type APF.
6. The local control method of a voltage detection type APF according to claim 1, wherein the constraint condition is:
Uh≤Uhmax
THDV≤THDVmax；
in the formula of UhFor h harmonic voltage of the controlled node, UhmaxH-order harmonic voltage U of controlled nodehMaximum value of, THDVFor total distortion rate of voltage, THDVmaxAs a total distortion rate of the voltage THDVMaximum value of (d);
the objective function is f:
f＝minΔGi
in the formula,. DELTA.GiFor voltage detection type APFiThe amount of harmonic conductance regulation.
7. A local control system of a voltage detection type APF, comprising:
the control area division module is used for dividing the power grid into a plurality of control areas by taking a node where each voltage detection type APF in the power grid is located as a center; the control node of the control area is an access node of the voltage detection type APF, and the controlled node of the control area is a node which is not accessed to the voltage detection type APF;
the acquisition module is used for acquiring the fluctuation range of harmonic pollution source injection harmonic current in each control area and the preset local operation characteristic of the voltage detection type APF; the local operating characteristic is a raising characteristic between harmonic conductance and harmonic voltage;
an optimal harmonic conductance regulating quantity determining module, configured to determine an optimal harmonic conductance regulating quantity of the voltage detection type APF in each control region according to the fluctuation range and the local operating characteristic, with non-off-limit harmonic distortion of each node in the control region as a constraint condition, and with a minimum subharmonic conductance regulating quantity as a target function;
and the conductance value adjusting module is used for adjusting the conductance value of the voltage detection type APF in each control area according to the optimal harmonic conductance adjustment quantity so as to control the voltage detection type APF.
8. The local control system of the voltage detection type APF according to claim 7, wherein the control region dividing module specifically comprises:
the first acquisition unit is used for acquiring the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node;
the sensitivity matrix construction unit is used for determining the sensitivity of the harmonic voltage to the virtual harmonic conductance according to the harmonic voltage of the controlled node and the virtual harmonic conductance of the control node, and constructing a sensitivity matrix according to the sensitivity;
and the control area dividing unit is used for acquiring the maximum sensitivity value of each row of elements in the sensitivity matrix and distributing the controlled node corresponding to the harmonic voltage with the maximum sensitivity value to the control area where the control node corresponding to the virtual harmonic conductance with the maximum sensitivity value is located.
9. The local control system of the voltage detection type APF of claim 7, wherein the optimal harmonic conductance adjustment amount determination module specifically comprises:
a harmonic voltage detection unit for detecting a harmonic voltage of the control node by using a local controller;
the harmonic conductance value determining unit is used for determining the harmonic conductance value of the control node according to the harmonic voltage;
and the optimal harmonic conductance regulating quantity determining unit is used for acquiring a harmonic conductance reference value and determining the optimal harmonic conductance regulating quantity according to the harmonic conductance value and the harmonic conductance reference value.
10. The local control system of the voltage detection type APF according to claim 7, wherein the conductance adjusting module specifically comprises:
the second acquisition unit is used for acquiring a harmonic voltage value before the disturbance of the control node and a harmonic voltage value after the disturbance;
the minimum value determining unit is used for determining the minimum value of the harmonic conductance regulation degree according to the optimal harmonic conductance regulation quantity, the harmonic voltage value of the control node before disturbance and the harmonic voltage value after disturbance;
and the conductance value adjusting unit is used for adjusting the conductance value of the voltage detection type APF in each control area according to the minimum value of the harmonic conductance adjustment degree so as to control the voltage detection type APF.
CN202010288930.7A 2020-04-14 2020-04-14 Local control method and system of voltage detection type APF Pending CN111541250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010288930.7A CN111541250A (en) 2020-04-14 2020-04-14 Local control method and system of voltage detection type APF

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010288930.7A CN111541250A (en) 2020-04-14 2020-04-14 Local control method and system of voltage detection type APF

Publications (1)

Publication Number Publication Date
CN111541250A true CN111541250A (en) 2020-08-14

Family

ID=71975104

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010288930.7A Pending CN111541250A (en) 2020-04-14 2020-04-14 Local control method and system of voltage detection type APF

Country Status (1)

Country Link
CN (1) CN111541250A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113285455A (en) * 2021-05-28 2021-08-20 燕山大学 Distributed setting method for voltage detection type APF local operation control parameters
CN116660623A (en) * 2023-06-29 2023-08-29 国网山东省电力公司汶上县供电公司 Harmonic detection method and system for power distribution network with distributed power supply

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08228469A (en) * 1995-02-20 1996-09-03 Matsushita Seiko Co Ltd Active power filter controller
CN107706915A (en) * 2017-10-11 2018-02-16 燕山大学 A kind of global optimization administering method for solving scattered harmonic source active distribution network harmonic wave
CN109617076A (en) * 2018-12-29 2019-04-12 燕山大学 For improving the voltage detecting type active filter of power quality at PCC

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08228469A (en) * 1995-02-20 1996-09-03 Matsushita Seiko Co Ltd Active power filter controller
CN107706915A (en) * 2017-10-11 2018-02-16 燕山大学 A kind of global optimization administering method for solving scattered harmonic source active distribution network harmonic wave
CN109617076A (en) * 2018-12-29 2019-04-12 燕山大学 For improving the voltage detecting type active filter of power quality at PCC

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
石磊磊等: "电力电子化配电网谐波分布式全局优化治理策略", 《中国电机工程学报》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113285455A (en) * 2021-05-28 2021-08-20 燕山大学 Distributed setting method for voltage detection type APF local operation control parameters
CN113285455B (en) * 2021-05-28 2023-02-14 燕山大学 Distributed setting method for voltage detection type APF local operation control parameters
CN116660623A (en) * 2023-06-29 2023-08-29 国网山东省电力公司汶上县供电公司 Harmonic detection method and system for power distribution network with distributed power supply

Similar Documents

Publication Publication Date Title
CN100530889C (en) Integrated power quality adjustment control method and device
CN110518575A (en) Multiple Time Scales active distribution network voltage optimization control method based on region division
CN109617105B (en) Distributed composite energy storage cooperative control method based on droop control
CN107342586B (en) Method and device for determining static equivalence of power distribution network
CN111900719B (en) Power grid adequacy evaluation method, device and system considering flexible controllable load
CN111541250A (en) Local control method and system of voltage detection type APF
CN112086997A (en) Photovoltaic coordination frequency modulation control method based on variable power tracking and super capacitor storage
CN112769127B (en) Alternating current micro-grid frequency attack detection and recovery method of distributed intermediate observer
Arunkumar et al. Supercapacitor voltage based power sharing and energy management strategy for hybrid energy storage system
CN111884195A (en) Method and system for optimizing droop control margin of direct-current power grid in consideration of probability power flow
CN111509728A (en) Optimal regulation and control method and system based on multi-source heterogeneous virtual load
CN115036978A (en) Operation control method and system for distributed photovoltaic cluster
CN114759584A (en) Frequency safety and stability judgment method of power system considering energy storage inertia support
CN107169562A (en) A kind of energy efficiency controlling method and device for data center
CN110137974B (en) Distributed photovoltaic cluster voltage control method and system
CN116341883B (en) Resource coordination method and system for photovoltaic grid-connected switch
Doostinia et al. Distributed event-triggered average consensus control strategy with fractional-order local controllers for DC microgrids
Tian et al. A network analysis-based distributed load shedding strategy for voltage collapse prevention
Taher et al. Precise current sharing and decentralized power management schemes based on virtual frequency droop method for LVDC microgrids
CN114172149B (en) Distributed generation cluster autonomous control method and system
CN113224770B (en) Power grid reactive power partitioning method integrating electrical distance and edge betweenness
CN109038558A (en) Simulate the power distribution network planning scheme security assessment method of optimum control process
CN113890057A (en) Control method and device based on multi-microgrid collaborative optimization and storage medium
Fahim et al. A method based on Fast Fourier transform for online supervising of power system and control structure design
US10847975B2 (en) Conservation voltage reduction system and methods using constant impedance load and constant power load technique

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20200814