CN101075783B - Three-phase medium-frequency DC high-voltage power supply for ESP - Google Patents
Three-phase medium-frequency DC high-voltage power supply for ESP Download PDFInfo
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- CN101075783B CN101075783B CN200710069164A CN200710069164A CN101075783B CN 101075783 B CN101075783 B CN 101075783B CN 200710069164 A CN200710069164 A CN 200710069164A CN 200710069164 A CN200710069164 A CN 200710069164A CN 101075783 B CN101075783 B CN 101075783B
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Abstract
The invention comprises: a variable current main circuit, an interface circuit and a power intelligent control circuit. Said variable current main circuit comprises a three-phase power input control circuit, a three-phase full-wave rectification circuit, a filter circuit, a inverter circuit, a three-phase higher harmonic filter circuit, and a three-phase intermediate frequency transformer. The a three-phase power frequency AC power is inputted to the three-phase power input control circuit, and is filtered and rectified by the three-phase rectification circuit and filter circuit to get DC voltage which is sent to the inverter circuit; after high frequency inversion and filter, a intermediate frequency voltage is obtained; the intermediate frequency voltage is boosted and filtered by the intermediate rectification transformer to get a DC voltage which is inputted into the both ends of the load.
Description
Technical field
The present invention relates to a kind of power supply, refer in particular to a kind of ESP three-phase intermediate frequency DC high-voltage power supply.
Background technology
Electrostatic precipitator (being called for short ESP) is the visual plant in the environmental protection field, is mainly used in plasma discharge, dedusting, demist, dehydration, air cleaning, high-effective dust-removing desulfurization, impurity separation and plurality of raw materials recovery etc.
The high voltage electric field equivalence of ESP is R, C shunt load, and wherein C is the equivalent capacity of high voltage electric field, is generally several thousand～several ten thousand PF, and R is a variable resistor, changes at any time with the ESP operating mode.As seen, ESP is fluctuating load, and is very big to the impact of its DC high-voltage power supply when flashover or short circuit take place, and must take corresponding measure to guarantee that power supply is reliable, stable operation for this reason.
Existing ESP mainly contains following several with power supply:
1, single-phase SCR power supply:
(1) work in power frequency 50Hz, make that volume of transformer is big, weight big, consume a large amount of copper, iron and transformer oil, along with the rise of material price, advantage is disappearing cheaply;
(2) exchanging phase shifting control, make that the grid side harmonic wave is serious, adopt the two-phase power supply, is out of balance load to electrical network;
(3) adopt the interchange phase-shift voltage regulating, make that output high pressure ripple is bigger, the average voltage of exporting to ESP is lower.
2, high frequency electric source:
Because the inherent characteristics of high frequency electric source can obviously improve the power supply performance to ESP, and then improve the dust-collecting efficiency of ESP, the exploitation of high frequency electric source becomes a hot technology.
But at present, continuous increase along with the ESP area, the capacity of high frequency electric source can not satisfy user's needs, especially needs capacity more than the 80KV/1A in electric power system, and the exploitation of high-power high-frequency power supply is subject to high-frequency loss, being difficult to has big breakthrough, present commercial heap(ed) capacity high frequency electric source is 70KV/1A, in addition, because control cubicle and transformer are inseparable, control cubicle is in outdoor operation, and useful life is shorter.
3, intermediate frequency power supply:
Intermediate frequency power supply has SCR power supply low-loss, high-power concurrently, the characteristics of high frequency electric source small size, high power supply performance, and technical conditions maturation, can form products with larger capacity in a short time, substitute big capacity SCR power supply, high capacity as early as possible, large-scale production, the first chance that dominates the market, and have cost advantage.
Relative the above-mentioned type power supply, the transformer of intermediate frequency power supply is than SCR power transformer volume little (1/ (2～3) that are about the SCR power transformer); Power supply performance and high frequency electric source are suitable, are easy to big capacity; Adopt lower reverse frequency, the IGBT loss is less, transformer adopting 400Hz intermediate frequency, and loss higher-frequency power supply is little; Control cubicle can separate with transformer, and control cubicle can be placed indoor, and service conditions is better, and reliability is higher, and the life-span is longer, is convenient to safeguard and maintenance; Intermediate frequency power supply higher-frequency power technology continuity is good, and 80KV/2A and 80KV/1A technical scheme can be constant, are convenient to shorten the construction cycle, form scale rapidly.
Shortcoming is that equal capacity intermediate frequency transformer volume higher-frequency power supply is big, but core material and the requirement of line bag are lower than high frequency electric source.
Summary of the invention
The invention provides a kind of power supply balance, volume and weight is little, the ESP of high power supply performance three-phase intermediate frequency DC high-voltage power supply.
A kind of ESP three-phase intermediate frequency DC high-voltage power supply, comprise unsteady flow main circuit, interface circuit and power supply smart control circuit, described unsteady flow main circuit adopts and exchanges (AC) → direct current (DC) → interchange (AC) → direct current (DC) unsteady flow working method, is connected and composed successively by three phase mains input control circuit, three-phase full wave rectifier circuit, filter circuit, inverter circuit, three-phase high-order harmonic filtering circuit, three-phase intermediate frequency rectifier transformer.The three phase mains input control circuit is introduced the three-phase main-frequency AC power, obtain direct voltage through three-phase full wave rectifier circuit and filter circuit rectifying and wave-filtering, deliver to inverter circuit, after high-frequency inversion, filtering, obtain three-phase midfrequent AC voltage, again through three-phase intermediate frequency rectifier transformer boost, rectification obtains direct voltage, inserts the load two ends.
Described three phase mains input control circuit is made up of several air switches or circuit breaker, several contactors and control circuit.
Described three phase mains input control circuit has soft start function.
Described three-phase full wave rectifier circuit is made up of a three phase full wave rectification module or three doube bridge arm rectification modules or six rectifier diodes, is used for the full-wave rectification of three-phase main-frequency AC power is become Rectified alternating current.
Described filter circuit is made up of direct current reactor and filter capacitor, and the Rectified alternating current that three-phase full wave rectifier circuit is exported is filtered into direct voltage more stably.
But described inverter circuit is made of several cut-off devices, it is 4.8kHz or 7.2kHz that the direct voltage that is used for importing is reverse into carrier wave fs, modulating wave fr is the three-phase PWM pulse of 400Hz, but the control end of each cut-off device links to each other with the output of corresponding module drive circuit, and the module drive circuit input end inserts the power supply smart control circuit.
But described cut-off device adopts gated transistor, static induction transistor, turn-off thyristor or huge transistor.
Described three-phase high-order harmonic filtering circuit is made up of the electric capacity that three inductance that link to each other respectively at the inverter circuit output and three Δs connect, its output inserts three-phase intermediate frequency rectifier transformer, the carrier wave fs that is used for inverter circuit output is 4.8kHz or 7.2kHz, and modulating wave fr is that to become frequency be the three-phase medium frequency alternating current of 400Hz in the three-phase PWM pulse bandwidth filtering of 400Hz.
Described three-phase intermediate frequency rectifier transformer is made up of three-phase intermediate frequency reactor, three-phase intermediate frequency step-up transformer, three-phase intermediate frequency rectifier and secondary voltage current sampling circuit, the output access interface circuit of secondary voltage current sampling circuit is used for the three-phase medium frequency alternating current is rectified into dc high-voltage through boosting.
Be connected to the dc bus sample circuit on the described inverter circuit, comprise voltage sample circuit and current sampling circuit, its input is connected with the dc bus of inverter circuit, and output access interface circuit is used to detect the voltage and current signal of inverter circuit dc bus.
Have access to the primary voltage current sampling circuit between described three-phase high-order harmonic filtering circuit and the three-phase intermediate frequency rectifier transformer, comprise at least one current transformer and a voltage transformer, its output access interface circuit.
Described interface circuit is by switching value signal output driving circuit, switching value input signal conditioning circuit, and once with compositions such as secondary current voltage sampling signal modulate circuits, the one end links to each other with main circuit, and the other end links to each other with the power supply smart control circuit.
Described power supply smart control circuit comprises the hardware configuration be made up of control circuit, display circuit and keyboard and control, software for display.
Power supply provided by the invention adopts the unsteady flow working method that exchanges (AC) → direct current (DC) → interchange (AC) → direct current (DC); The rectification of boosting of three-phase high-frequency inversion, intermediate frequency 400Hz can effectively improve power work efficient, the volume that reduces power supply, weight, reduces output ripple; Can produce the various waveforms that are suitable for the different operating modes of ESP, the ESP dust removing effects is had greatly improved; Power supply conversion efficiency height (＞92%), three phase supply balance and power factor height (＞0.9), little to the Harmonic Interference of electrical network; Custom-designed monitoring software interface is arranged, and easy to operate, user interface close friend can realize unmanned, few man on duty; Adopt independent operating, the advanced control model of centralized monitor; Have perfect defencive function, safe and reliable; It is the power supply that integrates modern power electronics technology, Computer Control Technology (DSP technology), network control technology.
Description of drawings
Fig. 1 is an electrical block diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of ESP comprises unsteady flow main circuit, interface circuit and power supply smart control circuit with three-phase intermediate frequency DC high-voltage power supply.
The unsteady flow main circuit is connected and composed successively by three phase mains input control circuit 1, three-phase full wave rectifier circuit 2, filter circuit 3, dc bus sample circuit 4, inverter circuit 5, three-phase high-order harmonic filtering circuit 6, primary voltage current sampling circuit 7, three-phase intermediate frequency rectifier transformer 8 and load circuit 9.
Three phase mains input control circuit 1 is made up of several air switches (or circuit breaker), contactor (containing vacuum contactor) and control circuit, its input termination three-phase main-frequency AC power, power to the unsteady flow main circuit, three-phase main-frequency alternating current A, B, C control are delivered to three-phase full wave rectifier circuit 2, and contained soft start function.
Three-phase full wave rectifier circuit 2 is made up of a three phase full wave rectification module or three doube bridge arm rectification modules or six rectifier diodes, is used for the full-wave rectification of three-phase main-frequency AC power is become Rectified alternating current.
Filter circuit 3 is made up of direct current reactor and filter capacitor, and the Rectified alternating current that three-phase full wave rectifier circuit is exported is filtered into direct voltage more stably.
But inverter circuit 5 is made of several cut-off devices, it is 4.8kHz or 7.2kHz that the direct voltage that is used for importing is reverse into carrier wave fs, modulating wave fr is the three-phase PWM pulse of 400Hz, but the control end of each cut-off device links to each other with the output of corresponding module drive circuit 10, and module drive circuit 10 inputs insert power supply smart control circuit 12.But cut-off device adopts gated transistor, static induction transistor, turn-off thyristor or huge transistor.
Be connected to dc bus sample circuit 4 on the inverter circuit 5, comprise voltage sample circuit and current sampling circuit, its input is connected with the dc bus of inverter circuit 5, and output access interface circuit 11 is used to detect the voltage and current signal of inverter circuit 5 dc buss.
Three-phase high-order harmonic filtering circuit 6 is made up of the electric capacity that three inductance that link to each other respectively at inverter circuit 5 outputs and three Δs connect, its output inserts three-phase intermediate frequency rectifier transformer 8, the carrier wave fs that is used for inverter circuit 5 output is 4.8kHz or 7.2kHz, and modulating wave fr is that to become frequency be the three-phase medium frequency alternating current of 400Hz in the three-phase PWM pulse bandwidth filtering of 400Hz.
Primary voltage current sampling circuit 7 comprises at least one current transformer and a voltage transformer, its output access interface circuit 11.
Three-phase intermediate frequency rectifier transformer 8 is made up of three-phase intermediate frequency reactor, three-phase intermediate frequency step-up transformer, three-phase intermediate frequency full-wave rectifier and secondary voltage current sampling circuit, the output access interface circuit 11 of secondary voltage current sampling circuit is used for the three-phase medium frequency alternating current is rectified into dc high-voltage through boosting.
The core material of three-phase intermediate frequency rectifier transformer 8 can adopt silicon steel or the crystallite of 0.21mm; Line packaging material material adopts common lacquer line; The transformer triple line holds group and adopts Δ/Y structure; The three phase rectifier rectifier bridge adopts common or intermediate frequency silicon stack; The transformer heat radiation can be adopted the oil cooling radiation fin.
SVPWM (space vector PWM) inversion transformation technique is adopted in unsteady flow control of the present invention, can reduce switching loss, improves the direct current utilance.Its unsteady flow control principle is the adjusting that realizes output voltage by space vector PWM (SVPWM), be specially: in by-pass cock period T s (fs=12*400Hz=4.8kHz), the amplitude that the size of insertion voltage vector T1 action time, T2 is regulated the 400Hz sine wave, and then regulate output voltage; By modulating frequency fr, decision sine wave phase θ=2 π * fr*t.
Three-phase main-frequency AC power AC380V obtains 510V left and right sides direct voltage through three phase mains input control circuit 1, three-phase full wave rectifier circuit 2 and filter circuit 3 rectifying and wave-filterings, deliver to IGBT inverter circuit 5, producing carrier wave fs through IGBT inverter circuit 5 is 4.8kHz or 7.2kHz, modulating wave fr is the three-phase PWM pulse of 400Hz, produce the 400Hz sinusoidal voltage through three-phase high-order harmonic filtering circuit 6, deliver to three-phase intermediate frequency rectifier transformer 8, through three-phase intermediate frequency rectifier transformer 8 boost, rectification obtains the 80kV direct voltage, the 80KV direct voltage gives load ESP circuit 9 power supplies.
It is three phase rectifier, three-phase IGBT high-frequency inversion and high frequency LC filtering that the unsteady flow main circuit adopts the unsteady flow working method of AC → DC → AC → DC, and intermediate frequency 400Hz boosts, rectification; Have three phase supply balance and power factor height (＞0.9), little to the Harmonic Interference of electrical network; Can effectively improve power work efficient, reduce volume, the weight of power supply, reduce the advantage of output ripple, have the low-loss of SCR power supply, high-power and high frequency electric source small size, high performance advantage concurrently, and technical conditions maturation, be easy to produce in enormous quantities, and have cost advantage, can substitute big capacity SCR power supply within a short period of time.
Power supply smart control circuit 12 comprises the hardware configuration be made up of control circuit, display circuit and keyboard and control, software for display.
Control circuit adopts three-phase intermediate frequency (400Hz) amplitude modulation pressure regulation, realize the adjusting of output voltage, and flashover processing response speed is fast, realizes the best power supply to ESP.
PI (proportional integral) control algolithm is adopted in voltage stabilizing/constant current control, realizes floating voltage stabilizing/constant current control.
The digital signal processor DSP s (TMS320F2812) of TI company is adopted in operation control, can realize the Optimal Control of power-supply system.
ARM or PC are adopted in monitoring, by the communication of RS485/CAN communication network, realize the collecting and distributing type Long-distance Control.
Claims (10)
1. an ESP is with three-phase intermediate frequency DC high-voltage power supply, comprise the unsteady flow main circuit, interface circuit (11) and power supply smart control circuit (12), it is characterized in that: described unsteady flow main circuit adopts the unsteady flow working method of interchange → direct current → interchange → direct current, by three phase mains input control circuit (1), three-phase full wave rectifier circuit (2), filter circuit (3), inverter circuit (5), three-phase high-order harmonic filtering circuit (6), three-phase intermediate frequency rectifier transformer (8) connects and composes successively, three phase mains input control circuit (1) is introduced the three-phase main-frequency AC power, obtain direct voltage through three-phase full wave rectifier circuit (2) and filter circuit (2) rectifying and wave-filtering, deliver to inverter circuit (5), through high-frequency inversion, obtain three-phase midfrequent AC voltage after the filtering, boost through three-phase intermediate frequency rectifier transformer (8) again, rectification obtains direct voltage, inserts load (9) two ends.
2. ESP as claimed in claim 1 three-phase intermediate frequency DC high-voltage power supply, it is characterized in that: described three phase mains input control circuit (1) is made up of several air switches or circuit breaker, several contactors and control circuit.
3. ESP as claimed in claim 1 is characterized in that with three-phase intermediate frequency DC high-voltage power supply: described three-phase full wave rectifier circuit (2) is made up of a three phase full wave rectification module or three doube bridge arm rectification modules or six rectifier diodes.
4. ESP as claimed in claim 1 three-phase intermediate frequency DC high-voltage power supply, it is characterized in that: described filter circuit (3) is made up of direct current reactor and filter capacitor, to the pulsating dc voltage filtering of three-phase full wave rectifier circuit (2) output.
5. ESP as claimed in claim 1 three-phase intermediate frequency DC high-voltage power supply, it is characterized in that: described inverter circuit (5) but constitute by several cut-off devices, but the control end of each cut-off device links to each other with the output of corresponding module drive circuit (10), and module drive circuit (10) input inserts power supply smart control circuit (12).
6. ESP as claimed in claim 5 three-phase intermediate frequency DC high-voltage power supply is characterized in that: but described cut-off device adopts gated transistor, static induction transistor, turn-off thyristor or huge transistor.
7. ESP as claimed in claim 1 three-phase intermediate frequency DC high-voltage power supply, it is characterized in that: described three-phase high-order harmonic filtering circuit (6) is formed its output access three-phase intermediate frequency rectifier transformer (8) by the electric capacity that three inductance that link to each other with inverter circuit (5) output respectively and three Δs are connected.
8. ESP as claimed in claim 1 three-phase intermediate frequency DC high-voltage power supply, it is characterized in that: described three-phase intermediate frequency rectifier transformer (8) is made up of three-phase intermediate frequency reactor, three-phase intermediate frequency step-up transformer, three-phase intermediate frequency rectifier and secondary voltage current sampling circuit, the output access interface circuit (11) of secondary voltage current sampling circuit.
9. ESP as claimed in claim 1 three-phase intermediate frequency DC high-voltage power supply, it is characterized in that: be connected to dc bus sample circuit (4) on the described inverter circuit (5), comprise voltage sample circuit and current sampling circuit, its input is connected with the dc bus of inverter circuit (5), output access interface circuit (11).
10. ESP as claimed in claim 1 three-phase intermediate frequency DC high-voltage power supply, it is characterized in that: have access to primary voltage current sampling circuit (7) between described three-phase high-order harmonic filtering circuit (6) and the three-phase intermediate frequency rectifier transformer (8), comprise at least one current transformer and a voltage transformer, its output access interface circuit (11).
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| CN200710069164A CN101075783B (en) | 2007-06-01 | 2007-06-01 | Three-phase medium-frequency DC high-voltage power supply for ESP |
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| CN200710069164A CN101075783B (en) | 2007-06-01 | 2007-06-01 | Three-phase medium-frequency DC high-voltage power supply for ESP |
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| CN101075783B true CN101075783B (en) | 2010-05-26 |
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