CN113285454B - Broadband dynamic harmonic energy storage and utilization method - Google Patents
Broadband dynamic harmonic energy storage and utilization method Download PDFInfo
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- CN113285454B CN113285454B CN202110438082.8A CN202110438082A CN113285454B CN 113285454 B CN113285454 B CN 113285454B CN 202110438082 A CN202110438082 A CN 202110438082A CN 113285454 B CN113285454 B CN 113285454B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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- 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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides a broadband dynamic harmonic energy storage and utilization method, which can realize the collection and utilization of harmonic energy; when the power supply system transmits power to the user side, a harmonic analyzer is mounted on each phase and used for detecting the harmonic waves of the voltage, a fast Fourier transform oscilloscope is used for displaying voltage harmonic signals, inter-harmonic waves and higher harmonic waves are calculated by adopting fast Fourier transform, and the harmonic signals are analyzed to control the on-off of the harmonic energy storage system; the voltage of the harmonic wave converts the energy of the harmonic wave voltage into direct current voltage through an alternating current/direct current rectifier, the direct current voltage charges a harmonic wave energy storage system, and the harmonic wave energy is stored in the harmonic wave energy storage system; the harmonic energy collected by the harmonic energy storage system is inverted into 220V 50Hz power frequency three-phase voltage through the power inverter and is transmitted to the power grid, and collection and utilization of the harmonic energy are achieved.
Description
Technical Field
The invention belongs to the field of harmonic energy storage of power systems, and relates to a broadband dynamic harmonic energy storage and utilization control method which is suitable for storing and utilizing harmonic energy of a power system.
Background
Due to the existence of power generation equipment, power transmission and distribution equipment and nonlinear loads of a power system, wave current can be distorted during power transmission to generate harmonic waves. The conventional harmonic compensation device mostly adopts a method of arranging an inductance-capacitance tuning filter to suppress harmonic waves. Harmonic energy is lost by the filter and is not fully utilized, resulting in energy waste. And the compensation characteristic of the inductance-capacitance tuned filter is easily influenced by the impedance and the running state of a power grid, and parallel resonance is easily generated between the inductance-capacitance tuned filter and a power system, so that harmonic amplification is caused, and the inductance-capacitance tuned filter is overloaded and even burnt out.
The quality factor of the electric energy is an important standard of the electric energy quality, and the electric energy quality can be improved by improving the harmonic pollution of the voltage. Storage based on harmonic frequency distributions is one of the ways harmonic energy storage systems operate efficiently. Compared with the traditional harmonic pollution removal, the harmonic energy storage system is used for storing the energy of the harmonic voltage, and the energy is not consumed by a filter. The harmonic energy storage system collects the output voltage of the harmonic voltage rectified by the rectifier and stores the output voltage through a capacitor inside the harmonic energy storage system. The harmonic energy storage system inverts the direct-current voltage collected by the capacitor into 50Hz power frequency three-phase voltage through the power inverter and outputs the 50Hz power frequency three-phase voltage to the power grid, so that the utilization of harmonic energy is realized, and the power quality is improved.
Disclosure of Invention
The invention provides a broadband dynamic harmonic energy storage and utilization method. The method applies fast Fourier transform analysis to voltage harmonic detection and analysis to realize harmonic detection of the power grid voltage, analyzes inter-harmonic and higher harmonic existing in the power grid voltage, controls the switch of a corresponding harmonic signal rectifier according to signals of the inter-harmonic and higher harmonic, realizes rectification of alternating current harmonic voltage into direct current voltage, charges a harmonic energy storage system, and realizes storage of harmonic energy.
Higher harmonic voltage u in an electrical network 1 (t) is expressed as:
wherein N is the highest harmonic frequency of the voltage signal; a. The n Is the fundamental or harmonic amplitude; n is the harmonic frequency, and when n =1, the harmonic frequency is the fundamental wave;
is the initial phase of the fundamental wave or harmonic wave; omega 0 Is the fundamental angular frequency, and
T 0 is the signal fundamental period.
The signal for each adjacent period of the inter-harmonic signal may be different. And the harmonic signal is changed, and the change is repeated once when the change meets M fundamental wave periodic changes. Fourier transform is performed on M harmonic periods of the harmonic periodic signal, and inter-harmonic voltage u 2 (t) the expression is:
wherein, c m Is at a frequency of
The amplitude of the sinusoidal inter-harmonic signal of (a); f. of 0 Is the frequency of the fundamental wave signal, and 0 ＝50Hz；
is the initial phase of the inter-harmonic signal; m is the number of the periodic signals; m is the harmonic number of the inter-harmonic signal; a is m Amplitude of the real-axis component, b m Amplitude of the imaginary axis component; j is an imaginary unit.
The inter-harmonics were analyzed:
when b is m When not less than 0, there is
When b is m When less than 0, there are
Wherein, c 0 Is a direct current component; t is w Is the width of the fourier time window; t is w ＝MT 1 ；T 1 The period of the inter-harmonic.
The harmonic analysis method adopts a fast Fourier transform analysis method.
The fourier transform is calculated as:
wherein F (ω) is the Fourier transform of F (t); f (t) is a integrable function; e is a natural constant; e.g. of the type -jωt Is a complex exponential sequence.
According to the principle of Fourier series, a periodic function can be expanded to be the sum of a constant and a set of sine function and cosine function with a common period, and f (t) is expanded to be Fourier series.
Wherein ω =2 π/T; t is the period of the periodic signal;
is the dc component of the periodic function signal.
Wherein, a k ，b k Is Fourier series; k is a natural number.
At the discontinuity, the fourier series can be expressed as:
for harmonic voltages with different frequencies, different rectifying circuits are adopted in the harmonic energy storage system, alternating-current harmonic voltage energy is converted into direct-current voltage energy through the rectifying circuits, and the harmonic energy storage system is charged, so that the storage function of harmonic energy is realized.
For the multi-frequency harmonic voltage converted into the direct current voltage to charge the harmonic energy storage system, the invention adopts the three-phase bridge type fully-controlled rectifying circuit to realize the function of converting alternating current into direct current. The rectified output voltage is pulsed six times in one period, and the waveform of each pulse is the same. The zero-crossing point of the line voltage is taken as the zero point of the time coordinate, and the rectified output voltage U can be obtained d Comprises the following steps:
wherein, U d Is a rectified output voltage; ω is the frequency of the harmonic voltage; alpha is the firing angle of the rectifying circuit.
Because the three-phase bridge type fully-controlled rectifying circuit is a resistance load, the average value of output current obtained by rectification is as follows:
I d ＝U d /R (14)
wherein, I d To rectify the output current; and R is the resistance value of the resistor of the rectifying circuit.
For recycling the energy in the harmonic energy storage system, the invention adopts the sine wave power inverter to invert the direct current voltage in the harmonic energy storage system into the alternating current voltage of 220V 50Hz, and sends the alternating current into the power grid through a line, thereby realizing the recycling of the energy. Because the harmonic energy storage system stores direct current voltage to form a voltage source, the invention adopts a voltage type inverter circuit to invert the direct current voltage stored by the harmonic energy.
The alternating voltage generated after voltage type inversion is 220V 50Hz sinusoidal alternating voltage, and the output voltage of the three-phase bridge type inversion circuit is quantitatively analyzed. Output line voltage u of harmonic energy storage system UV Comprises the following steps:
wherein u is UV Is the output line voltage; λ =6 η ± 1, η being a natural number.
The harmonic signal in the power grid voltage is analyzed through the harmonic analyzer, and the harmonic frequency of the harmonic signal is determined through fast Fourier transform. The harmonic energy storage system is controlled to be switched on and off by determining inter-harmonic and higher harmonic signals existing in the power grid voltage, and the harmonic voltage in the power grid charges the harmonic energy storage system through a corresponding harmonic frequency rectifying circuit, so that the storage of harmonic energy is realized. The charged harmonic energy storage system inverts the direct-current voltage in the harmonic energy storage system into a 220V 50Hz sinusoidal alternating-current voltage through a three-phase bridge type power inverter, and the sinusoidal alternating-current voltage is transmitted to a power grid, so that the harmonic energy is utilized.
Drawings
FIG. 1 is a diagram of a method for storing and utilizing broadband dynamic harmonic energy according to the method of the present invention.
FIG. 2 is a control diagram of a harmonic analyzer of the method of the present invention.
Fig. 3 is a block diagram of the basic structure of a sine wave power inverter system according to the method of the present invention.
Detailed Description
The invention provides a broadband dynamic harmonic energy storage and utilization method, which is explained in detail by combining the attached drawings as follows:
FIG. 1 is a diagram of a method for storing and utilizing broadband dynamic harmonic energy according to the method of the present invention. The broadband dynamic harmonic energy storage system comprises a harmonic analyzer, a fast Fourier transform oscilloscope, a three-phase bridge inverter and a harmonic energy storage system. Firstly, when a power supply system transmits power to a user terminal, a harmonic analyzer is installed on each phase and used for detecting voltage harmonic, a fast Fourier transform oscilloscope is used for displaying voltage harmonic signals, inter-harmonic waves and higher harmonics are calculated by adopting fast Fourier transform, and the harmonic energy storage system is controlled to be switched on and off by analyzing the harmonic signals. 29 capacitors of the harmonic energy storage system respectively store f with frequency 0 /9、f 0 /7、f 0 /5、f 0 /3、3f 0 、5f 0 、7f 0 、9f 0 、11f 0 、13f 0 、15f 0 、17f 0 、19f 0 、21f 0 、23f 0 、25f 0 、27f 0 、29f 0 、31f 0 、33f 0 、35f 0 、37f 0 、39f 0 、41f 0 、43f 0 、45f 0 、47f 0 、49f 0 And 51f 0 The harmonic energy. And when the harmonic wave is the third harmonic wave, a switch controlled by the third harmonic wave is turned on, the voltage of the third harmonic wave converts the energy of the harmonic wave voltage into direct-current voltage through an alternating-current/direct-current rectifier, and the direct-current voltage charges the harmonic wave energy storage system to store the harmonic wave energy in the harmonic wave energy storage system. The harmonic energy collected by the harmonic energy storage system is inverted into 220V 50Hz power frequency three-phase voltage through the power inverter and is transmitted to the power grid, and collection and utilization of the harmonic energy are achieved.
FIG. 2 is a control diagram of a harmonic analyzer of the method of the present invention. The harmonic analyzer system comprises a signal acquisition board card, a signal processing board card and a communication and power supply module. Firstly, the acquisition board card acquires voltage harmonic signals through acquiring current and voltage signals on a three-phase circuit and a multi-path synchronous analog-to-digital conversion sampling module, and the period measurement and shaping module is used for detecting the frequency of the harmonic signals. The frequency of voltage harmonics is analyzed by the acquired electric signals through the field programmable gate array chip through the induction coil, and the processed voltage harmonic signals are displayed on the open multimedia application platform through the core processing module. The communication and power supply module is used for supplying power and communicating parts of the harmonic analyzer, and the state display module displays the working state and the using state of the harmonic analyzer, and can display the working temperature and the battery power.
Fig. 3 is a block diagram of the basic structure of a sine wave power inverter system according to the method of the present invention. The sine wave power inverter system comprises a harmonic energy storage system, an input circuit, an inverter circuit, an auxiliary circuit, a control circuit, an output circuit and a protection circuit. Firstly, harmonic energy collected by the harmonic energy storage system converts direct-current voltage stored in the harmonic energy storage system into alternating-current voltage of 220V 50Hz through an input circuit and an inverter circuit, and the alternating-current voltage of 220V 50Hz is transmitted to a power grid through an output circuit, so that the recovery and utilization of the harmonic energy are realized. The auxiliary circuit is used for assisting the control circuit, the control circuit controls the working state of the inverter through reference voltage, and the protection circuit is used for protecting the power inverter in a normal working state.
Claims (1)
1. A broadband dynamic harmonic energy storage and utilization method is characterized in that when a power supply system transmits power to a user side, a harmonic analyzer is mounted on each phase and used for detecting harmonic waves of voltage, a voltage harmonic signal is displayed by a fast Fourier transform oscilloscope, inter-harmonic waves and higher harmonic waves are calculated by adopting fast Fourier transform, and the harmonic signals are analyzed to control the on-off of a harmonic energy storage system; 29 capacitors of the harmonic energy storage system respectively store the frequency f 0 /9、f 0 /7、f 0 /5、f 0 /3、3f 0 、5f 0 、7f 0 、9f 0 、11f 0 、13f 0 、15f 0 、17f 0 、19f 0 、21f 0 、23f 0 、25f 0 、27f 0 、29f 0 、31f 0 、33f 0 、35f 0 、37f 0 、39f 0 、41f 0 、43f 0 、45f 0 、47f 0 、49f 0 And 51f 0 The harmonic energy of (a); when the harmonic wave is the third harmonic wave, a switch controlled by the third harmonic wave is turned on, the voltage of the third harmonic wave converts the energy of the harmonic wave voltage into direct-current voltage through an alternating-current/direct-current rectifier, the direct-current voltage charges a harmonic wave energy storage system, and the harmonic wave energy is stored in the harmonic wave energy storage system; the harmonic energy collected by the harmonic energy storage system is inverted into power frequency three-phase voltage of 220V 50Hz through a power inverter and is transmitted to a power grid, and the collection and utilization of the harmonic energy are realized; higher harmonic voltage u in an electrical network 1 (t) is expressed as:
wherein N is the highest harmonic frequency of the voltage signal; a. The n Is the fundamental or harmonic amplitude; n is the harmonic frequency, and when n =1, the harmonic frequency is the fundamental wave;
is the initial phase of the fundamental wave or harmonic wave; omega 0 Is the fundamental angular frequency, an
T 0 Is the signal fundamental wave period;
the signal of each adjacent period of the inter-harmonic signal may be different, and the harmonic signal is changed, when the change satisfies that the change of M fundamental wave periods is repeated once, the Fourier transform is carried out on the M fundamental wave periods of the harmonic periodic signal, and the inter-harmonic voltage u 2 (t) the expression is:
wherein, c m Is at a frequency of
The amplitude of the sinusoidal inter-harmonic signal of (a); f. of 0 Is the frequency of the fundamental wave signal, and 0 ＝50Hz；
an initial phase of the inter-harmonic signal; m is the number of the periodic signals; m is the harmonic frequency of the inter-harmonic signal; a is m Amplitude of the real-axis component, b m Amplitude of the imaginary axis component; j is an imaginary unit; the inter-harmonics were analyzed: when b is m When not less than 0, there is
When b is m When less than 0, there are
Wherein, c 0 Is a direct current component; t is a unit of w Is the width of the fourier time window; t is w ＝MT 1 ；T 1 The period of the interharmonic;
the harmonic analysis method adopts a fast Fourier transform analysis method, and the calculation of Fourier transform is as follows:
wherein F (ω) is the Fourier transform of F (t); f (t) is a integrable function; e is a natural constant; e.g. of the type -jωt Is a complex exponential sequence;
according to the principle of Fourier series, a periodic function is expanded into a sum of a constant and a set of sine function and cosine function with a common period, and the Fourier series expansion of f (t) is as follows:
wherein ω =2 π/T; t is the period of the periodic signal;
is the direct current component of the periodic function signal;
wherein, a k ，b k Is Fourier series; k is a natural number; at the discontinuity, the fourier series is represented as:
for harmonic voltages with different frequencies, the harmonic energy storage system adopts different rectifier circuits, converts alternating harmonic voltage energy into direct current voltage energy through the rectifier circuits, and charges the harmonic energy storage system to realize the storage function of harmonic energy;
converting harmonic voltage of multiple frequencies into direct current voltage to charge a harmonic energy storage system, and realizing the function of converting alternating current into direct current by adopting a three-phase bridge type full-control rectifying circuit; the rectified output voltage is pulsed for six times in one period, and the waveform of each pulse is the same; obtaining the rectified output voltage U by using the zero crossing point of the line voltage as the zero point of the time coordinate d Comprises the following steps:
wherein, U d Is a rectified output voltage; omega is the frequency of the harmonic voltage; alpha is a trigger angle of the rectifying circuit;
because the three-phase bridge type fully-controlled rectifying circuit is a resistance load, the average value of output current obtained by rectification is as follows:
I d ＝U d /R
wherein, I d To rectify the output current; r is the resistance value of the resistor of the rectifying circuit;
energy in the harmonic energy storage system is recycled, a sine wave power inverter is adopted to invert direct-current voltage in the harmonic energy storage system into alternating-current voltage of 220V 50Hz, and alternating current is sent into a power grid through a line, so that the recycling of the energy is realized; the harmonic energy storage system stores direct-current voltage to form a voltage source; inverting the direct-current voltage stored by the harmonic energy by using a voltage type inverter circuit, wherein the alternating-current voltage generated after voltage type inversion is 220V 50Hz sinusoidal alternating-current voltage, and quantitatively analyzing the output voltage of the three-phase bridge inverter circuit; output line voltage u of harmonic energy storage system UV Comprises the following steps:
wherein u is UV Is the output line voltage; λ =6 η ± 1, η being a natural number;
the charged harmonic energy storage system inverts the direct-current voltage in the harmonic energy storage system into a 220V 50Hz sinusoidal alternating-current voltage through a three-phase bridge type power inverter, and the sinusoidal alternating-current voltage is transmitted to a power grid, so that the harmonic energy is utilized.
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| CN104868473A (en) * | 2015-06-03 | 2015-08-26 | 重庆大学 | Method and device for extracting and using secondary side harmonic wave of distribution transformer |
| CN110266009A (en) * | 2019-07-05 | 2019-09-20 | 华中科技大学 | A kind of exchange micro-capacitance sensor higher hamonic wave active stabilization device and method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10243559A (en) * | 1997-02-26 | 1998-09-11 | Meidensha Corp | Method of adjusting filter of device having higher harmonic wave suppressive function |
| CN1360727A (en) * | 1999-06-10 | 2002-07-24 | 鲁道夫·林帕埃克尔 | Charge transfer apparatus and method therefor |
| CN101807799A (en) * | 2010-04-27 | 2010-08-18 | 天津大学 | Super capacitor energy storage type power quality compensator |
| CN104868473A (en) * | 2015-06-03 | 2015-08-26 | 重庆大学 | Method and device for extracting and using secondary side harmonic wave of distribution transformer |
| CN110266009A (en) * | 2019-07-05 | 2019-09-20 | 华中科技大学 | A kind of exchange micro-capacitance sensor higher hamonic wave active stabilization device and method |
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