CN115954880B - Intelligent comprehensive compensation device for restraining harmonic waves - Google Patents
Intelligent comprehensive compensation device for restraining harmonic waves Download PDFInfo
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Abstract
The invention discloses an intelligent comprehensive compensation device for inhibiting harmonic waves, which comprises a passive filter module and an active filter module, wherein the passive filter module is connected in series with a first switch to form a passive filter module which can be disconnected; the active filter module is connected in series with a second switch to form an active filter module which can be disconnected; the disconnectable passive filter module and the disconnectable active filter module are connected in parallel and are connected in parallel with a power grid; the first switch or the second switch is in an off state; the power grid harmonic detection device comprises a first harmonic detector, wherein the first harmonic detector is used for detecting power grid harmonic, and when the detection value of the first harmonic detector is larger than a preset value, a switch which is switched on currently is controlled to be switched off by a first controller, and the switch which is switched off currently is controlled to be switched on currently. The invention improves the stability of restraining harmonic waves and is suitable for long-term unattended working environments.
Description
Technical Field
The invention belongs to the technical field of circuit filtering, and particularly relates to an intelligent comprehensive compensation device for inhibiting harmonic waves.
Background
The harmonic wave is a series of sine waves, the frequency of which is an integral multiple of the fundamental wave, and there are countless frequency waves with different frequencies and different amplitudes, and the sine waves can cause sinusoidal current in the power system and asymmetric voltage of the power system, so that the system is seriously damaged.
The Chinese patent with the application number of 202110764404.8 discloses an intelligent comprehensive compensation device for inhibiting harmonic waves, which comprises a passive module and an active module, wherein the passive module comprises a plurality of groups of thyristor switching capacitors, a single group of thyristor switching capacitors consists of compensation capacitors and thyristors, and the plurality of groups of thyristor switching capacitors are connected with a power grid in parallel through contactors; the active module comprises a three-phase full-bridge inverter, and the output end of the three-phase full-bridge inverter is connected with a power grid through a first inductor; when the system works, the passive module automatically compensates reactive power in a grading way, the active module can compensate the residual reactive power, and the passive module is used for filtering harmonic current on a load and enabling the power grid current to only contain fundamental positive sequence components with the same phase as the power grid voltage. The invention adopts the linkage operation of the active module and the passive module, has higher steady-state precision and dynamic response speed, improves the stability of the power system, and optimizes the power quality.
The problem of this prior art is that after the active module or passive module damages, in unmanned environment, after damaging be difficult to repair, then be difficult to realize stable filtering effect.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an intelligent comprehensive compensation device for inhibiting harmonic waves, which has the advantage of stable filtering and solves the problems that in the prior art, after an active module or a passive module is damaged, the active module or the passive module is difficult to repair in an unattended environment, and then the stable filtering effect is difficult to realize.
The invention is realized in such a way that the harmonic wave suppression intelligent comprehensive compensation device comprises a passive filter module and an active filter module, wherein the passive filter module is connected in series with a first switch to form a passive filter module which can be disconnected;
the active filter module is connected in series with a second switch to form an active filter module which can be disconnected;
the disconnectable passive filter module and the disconnectable active filter module are connected in parallel and are connected in parallel with a power grid; the first switch or the second switch is in an off state;
the power grid harmonic detection device comprises a first harmonic detector, wherein the first harmonic detector is used for detecting power grid harmonic, and when the detection value of the first harmonic detector is larger than a preset value, a switch which is switched on currently is controlled to be switched off by a first controller, and the switch which is switched off currently is controlled to be switched on currently.
Preferably, the second switch is in an on state, and the first switch is in an off state;
when the detection value of the first harmonic detector is larger than a preset value, the first controller controls the second switch to be turned off and controls the first switch to be turned on.
In the arrangement, the second switch is in a conducting state, and when the first switch is in an off state, the active filter module pair is used for restraining harmonic waves in the power grid, so that the transmission quality of the power grid is improved. When the active filtering module is damaged, the detection value of the first harmonic detector is larger than a preset value, and at the moment, the first harmonic detector controls the second switch to be disconnected and controls the first switch to be conducted through the first controller, so that the passive filtering module suppresses harmonic waves in the power grid, and the transmission quality of the power grid is not obviously reduced. The technical scheme provided by the equipment improves the stability of harmonic suppression, and is suitable for long-term unattended operation environment.
Preferably, the first switch is in an on state, and the second switch is in an off state;
when the detection value of the first harmonic detector is larger than a preset value, the first switch is controlled to be turned off by the first controller, and the second switch is controlled to be turned on.
In the arrangement, when the first switch is in a conducting state and the second switch is in a disconnecting state, the passive filter module pair is used for restraining harmonic waves in the power grid, so that the transmission quality of the power grid is improved. When the passive filter module is damaged due to resonance or other reasons, the detection value of the first harmonic detector is larger than a preset value, and at the moment, the first harmonic detector controls the first switch to be disconnected and the second switch to be connected through the first controller, so that the active filter module can inhibit harmonic waves in the power grid, and the transmission quality of the power grid is not obviously reduced. The technical scheme provided by the equipment improves the stability of harmonic suppression, and is suitable for long-term unattended operation environment.
Furthermore, when filtering, the filtering is usually performed through a passive filter, and the passive filter has the advantages of simple structure, low cost, higher operation reliability, lower operation cost and the like, and is still widely applied to a harmonic wave treatment method. However, passive filters have the disadvantage of being prone to parallel resonance with the system, resulting in harmonic amplification, overloading and even burning out the LC filter. When parallel resonance occurs, a large current flows through the inductance and capacitance elements, and therefore, an accident such as a fuse of the circuit blowing or burning out an electric device may occur.
The parallel resonance occurs for the following reasons: in an ac circuit including a resistor, an inductor, and a capacitor, the voltage across the circuit is generally out of phase with the current, and if the circuit parameters or the power supply frequency are adjusted so that the current is in phase with the power supply voltage, the circuit is resistive, and the operating state of the circuit is said to be resonant. In a circuit in which an inductor and a capacitor are connected in parallel, when the capacitor is just in phase with the voltage and the current in the circuit, that is, the power supply power is consumed by all resistors, the circuit is called parallel resonance.
The parallel resonance problem of passive filters can be reduced by:
as a preferred embodiment of the present invention, the passive filtering module includes: the passive filter is connected in parallel with the power grid and used for inhibiting harmonic waves of circuit current;
the voltage phase detector is connected to the power grid and used for detecting the phase of the power grid voltage;
the current phase detector is connected to the power grid and used for detecting the phase of the power grid current;
a first comparator, signally connected to the voltage phase detector and the current phase detector, for comparing whether the phase of the circuit voltage and the phase of the circuit current are the same;
the first phase regulator is connected to the first comparator and is used for regulating the phase of the power grid voltage or the phase of the power grid current so that the phase of the power grid voltage and the phase of the power grid current are different.
By the arrangement, the parallel resonance of the passive filter module can be reduced, and overload and even burning of the passive filter caused by the fact that harmonic waves are amplified due to the parallel resonance when the passive filter module filters are prevented.
Preferably, the first phase regulator is used for regulating circuit parameters or power supply frequency, so that the phase of the grid current is different from that of the grid voltage.
Preferably, a filter capable of switching frequencies is further connected to the previous node of the passive filter module.
The filter capable of switching the frequency can inhibit the harmonic wave of partial frequency of the power grid current and reduce the overload degree of the passive filter module caused by resonance.
For example, the filter capable of switching frequencies is set as a dynamic filter (thyristor controlled filter), and harmonics of different frequencies can be filtered out in a preset order or randomly.
The thyristor control filter adopts a thyristor flexible switching technology, and can effectively solve the problems of overvoltage, overcurrent, transient impact and the like generated when the traditional thyristor voltage zero-crossing switching technology is adopted. The problems of low triggering reliability, waveform distortion and thyristor damage of the thyristor are fully solved.
As the preferable mode of the invention, the passive filter module is connected with an anti-resonance reactor in series, so that the resonance frequency of the parallel capacitor is lower than the frequency of the lowest harmonic, the resonance frequency is avoided, and the harmonic amplification can be avoided. This arrangement is suitable for use in systems with harmonic content less than 30%.
Further, the following describes the active filtering module of the present application:
the active filter module comprises an active filter, wherein the active filter comprises an operational amplifier, a negative resistor, a negative capacitor, a negative inductor, a frequency rheostat, a generalized impedance converter, a negative impedance converter, a positive impedance converter, a negative impedance inverter, a positive impedance inverter and four controlled sources, and in addition, a sick element pole and a sick element pole are arranged. The method can dynamically filter out each subharmonic wave and can completely absorb the harmonic wave in the system.
An active power filter is a novel power electronic device for dynamically suppressing harmonics, compensating for reactive power, and capable of compensating for harmonics and varying reactive power that vary in both size and frequency. The active filter is called active, and the name implies that the device needs to provide power, and the application of the device can overcome the defects of the traditional harmonic suppression and reactive compensation methods such as an LC filter, realize dynamic tracking compensation and can compensate both harmonic waves and reactive power. The three-phase circuit instantaneous reactive power theory is a main basic theory of APF development; APF has two types of parallel connection type and serial connection type, and the former is used for a lot; the parallel active filters are mainly used for treating current harmonics, and the series active filters are mainly used for treating voltage harmonics and the like. Compared with a passive filter, the active filter has good treatment effect, can mainly filter out multiple times and higher harmonics at the same time, does not cause resonance, but has relatively high price.
The principle of the active filter is as follows:
and active filtering, which compensates the harmonic wave with the changing amplitude and frequency and the changing reactive power. The controllable power semiconductor device is used for injecting current with the same amplitude and opposite phase to the original harmonic current into the power grid, so that the total harmonic current of the power supply is zero, and the purpose of compensating the harmonic current in real time is achieved.
The following problems occur when the active filter is used for filtering: if the phase of the injected current harmonic wave deviates from the phase of the original harmonic current, the active dynamic filtering effect cannot be achieved.
Preferably, the invention further comprises an adjusting module for adjusting the current phase of the active filtering module:
the system comprises a phase detector, a second harmonic detector and an intelligent discriminator;
the phase detector is used for detecting the phase of the original current in the power grid;
the second harmonic detector is used for detecting the harmonic wave in the current filtered by the active filtering module;
the output end signal of the second harmonic detector is connected with the intelligent discriminator, the intelligent discriminator is connected with a second controller, the output end signal of the second controller is connected with the active filtering module, and the second controller adjusts the phase and the amplitude of the current input into the power grid by the active filtering module according to the phase and the amplitude of the original current detected by the phase detector. Thereby ensuring that the current with the same amplitude and opposite phase to the original harmonic current is injected into the power grid.
A harmonic-wave-suppressing intelligent comprehensive compensation method of a harmonic-wave-suppressing intelligent comprehensive compensation device comprises the following steps:
setting the second switch to an on state and the first switch to an off state;
when the detection value of the first harmonic detector is larger than a preset value, the first controller controls the second switch to be disconnected, controls the first switch to be conducted, and controls the second switch to be in a conducting state, and when the first switch is in a disconnecting state, an active filter module is used for suppressing harmonic waves in a power grid, so that the transmission quality of the power grid is improved;
when the active filter module is damaged, the detection value of the first harmonic detector is larger than a preset value, and at the moment, the first harmonic detector controls the second switch to be disconnected through the first controller and controls the first switch to be conducted, so that the passive filter module can inhibit harmonic waves in a power grid.
Compared with the prior art, the invention has the following beneficial effects:
in the invention, when the second switch is in a conducting state and the first switch is in a disconnecting state, the active filter module is used for restraining harmonic waves in the power grid, so that the transmission quality of the power grid is improved. When the active filtering module is damaged, the detection value of the first harmonic detector is larger than a preset value, and at the moment, the first harmonic detector controls the second switch to be disconnected and controls the first switch to be conducted through the first controller, so that the passive filtering module suppresses harmonic waves in the power grid, and the transmission quality of the power grid is not obviously reduced. The technical scheme provided by the equipment improves the stability of harmonic suppression, and is suitable for long-term unattended operation environment.
Drawings
FIG. 1 is a block diagram of an intelligent comprehensive compensation device for suppressing harmonic waves according to embodiment 1 of the present invention;
FIG. 2 is a block diagram of the device for suppressing harmonic intelligent integrated compensation according to embodiment 2 of the present invention;
FIG. 3 is a block diagram of an intelligent comprehensive compensation device for suppressing harmonic waves according to embodiment 3 of the present invention;
FIG. 4 is a block diagram of the device for suppressing harmonic intelligent integrated compensation provided in embodiment 4 of the present invention;
FIG. 5 is a block diagram of the device for suppressing harmonic intelligent integrated compensation provided in embodiment 5 of the present invention;
FIG. 6 is a block diagram of an intelligent comprehensive compensation device for suppressing harmonic waves according to embodiment 6 of the present invention;
fig. 7 is a flow chart of a method for suppressing harmonic intelligent integrated compensation of the device for suppressing harmonic intelligent integrated compensation provided by the embodiment of the invention.
In the figure: 1. a passive filtering module; 2. an active filtering module; 3. a first switch; 4. a second switch; 5. a passive filtering module capable of being disconnected; 6. an active filter module that can be disconnected; 7. a first harmonic detector; 8. a first controller; 9. a filter capable of switching frequencies; 10. an anti-resonance reactor; 101. a passive filter; 102. a voltage phase detector; 103. a current phase detector; 104. a first comparator; 105. a first phase adjuster; 111. a phase detector; 112. a second harmonic detector; 113. an intelligent arbiter; 114. and a second controller.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings.
The structure of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2, the harmonic-wave-suppressing intelligent comprehensive compensation device provided by the embodiment of the invention comprises a passive filter module 1 and an active filter module 2, wherein the passive filter module 1 is connected in series with a first switch 3 to form a passive filter module 5 which can be disconnected; the active filter module 2 is connected in series with a second switch 4 to form an active filter module 6 which can be disconnected; the disconnectable passive filter module 5 and the disconnectable active filter module 6 are connected in parallel and are both connected in parallel to a power grid; the first switch 3 or the second switch 4 is in an off state; the device also comprises a first harmonic detector 7 for detecting the harmonic of the power grid, and when the detection value of the first harmonic detector 7 is larger than a preset value, the first controller 8 controls the switch which is turned on currently to be turned off, and controls the switch which is turned off currently to be turned on.
Examples
Referring to fig. 2, the second switch 4 is in an on state, and the first switch 3 is in an off state;
when the detection value of the first harmonic detector 7 is larger than a preset value, the first controller 8 controls the second switch 4 to be turned off and controls the first switch 3 to be turned on.
In this arrangement, the second switch 4 is in an on state, and when the first switch 3 is in an off state, the active filter module 2 is used to suppress harmonics in the power grid, thereby improving the transmission quality of the power grid. When the active filtering module 2 is damaged, the detection value of the first harmonic detector 7 is larger than a preset value, and at the moment, the first harmonic detector 7 controls the second switch 4 to be disconnected and controls the first switch 3 to be conducted through the first controller 8, so that the passive filtering module 1 suppresses the harmonic wave in the power grid, and the transmission quality of the power grid is not obviously reduced. The technical scheme provided by the equipment improves the stability of harmonic suppression, and is suitable for long-term unattended operation environment.
Examples
Referring to fig. 1, the first switch 3 is in an on state, and the second switch 4 is in an off state;
when the detection value of the first harmonic detector 7 is larger than a preset value, the first switch 3 is controlled to be turned off by the first controller 8, and the second switch 4 is controlled to be turned on.
In this arrangement, when the first switch 3 is in an on state and the second switch 4 is in an off state, the passive filter module 1 is used to suppress harmonics in the power grid, thereby improving the transmission quality of the power grid. When the passive filter module 1 is damaged due to resonance or other reasons, the detection value of the first harmonic detector 7 is larger than a preset value, and at this time, the first harmonic detector 7 controls the first switch 3 to be turned off and controls the second switch 4 to be turned on through the first controller 8, so that the active filter module 2 suppresses the harmonic wave in the power grid, and the transmission quality of the power grid is not significantly reduced. The technical scheme provided by the equipment improves the stability of harmonic suppression, and is suitable for long-term unattended operation environment.
Examples
When filtering, the filtering is usually carried out through a passive filter, and the passive filter has the advantages of simple structure, low cost, higher operation reliability, lower operation cost and the like, and is still widely applied to a harmonic wave treatment method. However, passive filters have the disadvantage of being prone to parallel resonance with the system, resulting in harmonic amplification, overloading and even burning out the LC filter. When parallel resonance occurs, a large current flows through the inductance and capacitance elements, and therefore, an accident such as a fuse of the circuit blowing or burning out an electric device may occur.
The parallel resonance occurs for the following reasons: in an ac circuit including a resistor, an inductor, and a capacitor, the voltage across the circuit is generally out of phase with the current, and if the circuit parameters or the power supply frequency are adjusted so that the current is in phase with the power supply voltage, the circuit is resistive, and the operating state of the circuit is said to be resonant. In a circuit in which an inductor and a capacitor are connected in parallel, when the capacitor is just in phase with the voltage and the current in the circuit, that is, the power supply power is consumed by all resistors, the circuit is called parallel resonance.
The parallel resonance problem of passive filters can be reduced by:
referring to fig. 3, the passive filtering module 1 includes: a passive filter 101 connected in parallel to the power grid for suppressing harmonics of the circuit current;
a voltage phase detector 102 connected to the power grid for detecting a phase of the power grid voltage;
a current phase detector 103 connected to the power grid for detecting the phase of the power grid current;
a first comparator 104, signally connected to said voltage phase detector 102 and said current phase detector 103, for comparing whether the phase of the circuit voltage and the phase of the circuit current are the same;
the first phase adjuster 105 is connected to the first comparator 104, and is configured to adjust a phase of the grid voltage or a phase of the grid current so that the phase of the grid voltage and the phase of the grid current are different.
By this arrangement, the parallel resonance of the passive filter module 1 can be reduced, and overload and even burnout of the passive filter due to the amplification of harmonics caused by the parallel resonance when the passive filter module 1 filters can be prevented.
Specifically, the first phase adjuster 105 is configured to adjust a circuit parameter or a power frequency so that a phase of the grid current is different from a phase of the grid voltage.
Examples
Referring to fig. 4, a filter 9 capable of switching frequencies is further connected to the previous node of the passive filter module 1.
The frequency-switchable filter 9 suppresses harmonics of part of the frequency of the grid current and reduces the degree of overload of the passive filter module 1 due to resonance. For example, the frequency-switchable filter 9 is provided as a dynamic filter (thyristor-controlled filter) that filters out harmonics of different frequencies in a predetermined order or randomly.
The thyristor control filter adopts a thyristor flexible switching technology FACTF, and can effectively solve the problems of overvoltage, overcurrent, transient impact and the like generated when the traditional thyristor voltage zero-crossing switching technology is adopted. The problems of low triggering reliability, waveform distortion and thyristor damage of the thyristor are fully solved.
Examples
Referring to fig. 5, the passive filter module 1 is connected in series with an anti-resonant reactor 10, so that the resonant frequency of the parallel capacitor is lower than the frequency of the lowest harmonic, avoiding the resonant frequency and avoiding the harmonic amplification. This arrangement is suitable for use in systems with harmonic content less than 30%.
Further, the active filter module 2 of the present application is described below:
the active filtering module (2) comprises an active filter, wherein the active filter comprises an operational amplifier, a negative resistor, a negative capacitor, a negative inductor, a frequency rheostat (FDNR), a generalized impedance transformer (GIC), a negative impedance transformer (NIC), a positive impedance transformer (PIC), a Negative Impedance Inverter (NII), a Positive Impedance Inverter (PII) and four controlled sources, and in addition, a sick element pole and a zero. The method can dynamically filter out each subharmonic wave and can completely absorb the harmonic wave in the system.
An active power filter (Active Power Filter, APF for short) is a novel power electronic device for dynamically suppressing harmonics, compensating for reactive power, and capable of compensating for harmonics and varying reactive power of varying magnitude and frequency. The active filter is called active, and the name implies that the device needs to provide a power supply (for compensating the harmonic wave of a main circuit), and the application of the active filter can overcome the defects of the traditional harmonic wave suppression and reactive compensation methods such as an LC filter (the traditional method can only be used for fixed compensation), realize dynamic tracking compensation and can compensate both the harmonic wave and reactive power. The three-phase circuit instantaneous reactive power theory is a main basic theory of APF development; APF has two types of parallel connection type and serial connection type, and the former is used for a lot; the parallel active filters are mainly used for treating current harmonics, and the series active filters are mainly used for treating voltage harmonics and the like. Compared with a passive filter, the active filter has good treatment effect, can mainly filter out multiple times and higher harmonics at the same time, does not cause resonance, but has relatively high price.
The principle of the active filter is as follows:
and active filtering, which compensates the harmonic wave with the changing amplitude and frequency and the changing reactive power. The controllable power semiconductor device is used for injecting current with the same amplitude and opposite phase to the original harmonic current into the power grid, so that the total harmonic current of the power supply is zero, and the purpose of compensating the harmonic current in real time is achieved.
The following problems occur when the active filter is used for filtering: if the phase of the injected current harmonic wave deviates from the phase of the original harmonic current, the active dynamic filtering effect cannot be achieved.
Examples
Referring to fig. 6, the apparatus further includes an adjusting module for adjusting the current phase of the active filtering module 2:
comprises a phase detector 111, a second harmonic detector 112 and an intelligent arbiter 113;
the phase detector 111 is configured to detect a phase of an original current in the power grid;
the second harmonic detector 112 is configured to detect a harmonic in the current filtered by the active filtering module 2;
the output end signal of the second harmonic detector 112 is connected with the intelligent discriminator 113, the intelligent discriminator 113 is connected with the second controller 114, the output end signal of the second controller 114 is connected with the active filtering module 2, and the second controller 114 adjusts the phase and the amplitude of the current input into the power grid by the active filtering module 2 according to the phase and the amplitude of the original current detected by the phase detector 111, so that the current with the same amplitude and opposite phase to the original harmonic current is injected into the power grid.
Referring to fig. 7, a method for suppressing harmonic intelligent integrated compensation of a harmonic intelligent integrated compensation device includes the following steps:
step S1, setting the second switch 4 to be in a conducting state, and setting the first switch 3 to be in an off state;
step S2, when the detection value of the first harmonic detector 7 is greater than a preset value, the first controller 8 controls the second switch 4 to be turned off, and controls the first switch 3 to be turned on, the second switch 4 is in a conducting state, and when the first switch 3 is in a turning-off state, the active filter module 2 is used for suppressing the harmonic wave in the power grid, so that the transmission quality of the power grid is improved;
and step S3, when the active filter module 2 is damaged, the detection value of the first harmonic detector 7 is larger than a preset value, and at the moment, the first harmonic detector 7 controls the second switch 4 to be disconnected and controls the first switch 3 to be connected through the first controller 8, so that the passive filter module 1 suppresses the harmonic wave in the power grid.
The working principle of the invention is as follows:
when the active filter module 2 is used, the second switch 4 is in a conducting state, and when the first switch 3 is in a disconnecting state, the active filter module 2 is used for suppressing harmonic waves in the power grid, so that the transmission quality of the power grid is improved. When the active filtering module 2 is damaged, the detection value of the first harmonic detector 7 is larger than a preset value, and at the moment, the first harmonic detector 7 controls the second switch 4 to be disconnected and controls the first switch 3 to be conducted through the first controller 8, so that the passive filtering module 1 suppresses the harmonic wave in the power grid, and the transmission quality of the power grid is not obviously reduced. The technical scheme provided by the equipment improves the stability of harmonic suppression, and is suitable for long-term unattended operation environment.
Or when the first switch 3 is in a conducting state and the second switch 4 is in a disconnecting state, the passive filter module 1 is used for suppressing harmonic waves in the power grid, so that the transmission quality of the power grid is improved. When the passive filter module 1 is damaged due to resonance or other reasons, the detection value of the first harmonic detector 7 is larger than a preset value, and at this time, the first harmonic detector 7 controls the first switch 3 to be turned off and controls the second switch 4 to be turned on through the first controller 8, so that the active filter module 2 suppresses the harmonic wave in the power grid, and the transmission quality of the power grid is not significantly reduced. The technical scheme provided by the equipment improves the stability of harmonic suppression, and is suitable for long-term unattended operation environment.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a restrain harmonic formula intelligence and synthesize compensation arrangement, includes passive filter module (1) and active filter module (2), its characterized in that:
the passive filter module (1) is connected in series with a first switch (3) to form a disconnected passive filter module (5);
the active filtering module (2) is connected in series with a second switch (4) to form an active filtering module (6) which can be disconnected;
the disconnectable passive filter module (5) and the disconnectable active filter module (6) are connected in parallel and are connected in parallel to a power grid; the first switch (3) or the second switch (4) is in an off state;
the power grid harmonic detection device further comprises a first harmonic detector (7) for detecting power grid harmonic, and when the detection value of the first harmonic detector (7) is larger than a preset value, the first controller (8) controls the switch which is turned on currently to be turned off, and controls the switch which is turned off currently to be turned on.
2. The intelligent comprehensive compensation device for suppressing harmonic waves as claimed in claim 1, wherein:
the second switch (4) is in an on state, and the first switch (3) is in an off state;
when the detection value of the first harmonic detector (7) is larger than a preset value, the first controller (8) controls the second switch (4) to be turned off, and controls the first switch (3) to be turned on.
3. The intelligent comprehensive compensation device for suppressing harmonic waves as claimed in claim 1, wherein:
the first switch (3) is in an on state, and the second switch (4) is in an off state;
when the detection value of the first harmonic detector (7) is larger than a preset value, the first switch (3) is controlled to be turned off by the first controller (8), and the second switch (4) is controlled to be turned on.
4. The intelligent comprehensive compensation device for suppressing harmonic waves as claimed in claim 1, wherein:
the passive filter module (1) comprises: a passive filter (101) connected in parallel to the power grid for suppressing harmonics of the circuit current;
a voltage phase detector (102) connected to the power grid for detecting a phase of the power grid voltage;
a current phase detector (103) connected to the grid for detecting the phase of the grid current;
a first comparator (104) signally connected to said voltage phase detector (102) and said current phase detector (103) for comparing whether the phase of the circuit voltage and the phase of the circuit current are the same;
and a first phase adjuster (105) connected to the first comparator (104) for adjusting the phase of the grid voltage or the phase of the grid current so that the phase of the grid voltage and the phase of the grid current are different.
5. The intelligent comprehensive compensation device for suppressing harmonic waves as claimed in claim 4, wherein:
the first phase adjuster (105) is used for adjusting circuit parameters or power supply frequency so that the phases of the power grid current and the power grid voltage are different.
6. The intelligent comprehensive compensation device for suppressing harmonic waves as claimed in claim 5, wherein:
the last node of the passive filtering module (1) is also connected with a filter (9) capable of switching the frequency.
7. The intelligent comprehensive compensation device for suppressing harmonic waves as claimed in claim 6, wherein:
the passive filter module (1) is connected in series with an anti-resonance reactor (10) so that the resonance frequency of the parallel capacitor is lower than the frequency of the lowest harmonic wave and avoids the resonance frequency.
8. The intelligent comprehensive compensation device for suppressing harmonic waves as claimed in claim 1, wherein:
the device further comprises an adjusting module for adjusting the current phase of the active filtering module (2):
comprises a phase detector (111), a second harmonic detector (112) and an intelligent discriminator (113);
the phase detector (111) is used for detecting the phase of the original current in the power grid;
the second harmonic detector (112) is used for detecting the harmonic wave in the current filtered by the active filtering module (2);
the output end signal of the second harmonic detector (112) is connected with the intelligent discriminator (113), the intelligent discriminator (113) is connected with a second controller (114) in a signal mode, the output end signal of the second controller (114) is connected with the active filtering module (2), and the second controller (114) adjusts the phase and the amplitude of the current input into a power grid by the active filtering module (2) according to the phase and the amplitude of the original current detected by the phase detector (111).
9. The intelligent comprehensive compensation device for suppressing harmonic waves as claimed in claim 1, wherein:
the harmonic-wave-suppressing intelligent comprehensive compensation method of the harmonic-wave-suppressing intelligent comprehensive compensation device comprises the following steps of:
-setting the second switch (4) to an on-state and the first switch (3) to an off-state;
when the detection value of the first harmonic detector (7) is larger than a preset value, the first controller (8) controls the second switch (4) to be disconnected, and controls the first switch (3) to be conducted, the second switch (4) is in a conducting state, and when the first switch (3) is in a disconnecting state, the active filter module (2) is used for suppressing harmonic waves in a power grid;
when the active filtering module (2) is damaged, the detection value of the first harmonic detector (7) is larger than a preset value, and at the moment, the first harmonic detector (7) controls the second switch (4) to be disconnected through the first controller (8) and controls the first switch (3) to be connected, so that the passive filtering module (1) can inhibit harmonic waves in a power grid.
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