CN107395034A - From commutation rectification circuit and idle method for transformation - Google Patents
From commutation rectification circuit and idle method for transformation Download PDFInfo
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- CN107395034A CN107395034A CN201710808179.7A CN201710808179A CN107395034A CN 107395034 A CN107395034 A CN 107395034A CN 201710808179 A CN201710808179 A CN 201710808179A CN 107395034 A CN107395034 A CN 107395034A
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- 238000006243 chemical reaction Methods 0.000 claims description 80
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- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000005868 electrolysis reaction Methods 0.000 abstract description 5
- 238000003723 Smelting Methods 0.000 abstract description 2
- 230000005284 excitation Effects 0.000 abstract description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/1552—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a biphase or polyphase arrangement
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
- H02M7/1623—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit
- H02M7/1626—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration with control circuit with automatic control of the output voltage or current
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
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Abstract
The present invention is a kind of rectification circuit.Can be converted into the quadergy stored in the resistive load of inductive load or capacity load or direct current reactor of having connected from commutation rectification circuit can be supported active energy used, and a kind of novel rectifying circuit of resistive load power factor can be greatly improved.Electrochemical electrolysis system, direct current smelting system, motor excitation system, some IC systems etc. are can be applied to, are particularly played an important roll in DC transmission system.The present invention can also apply in 12 pulsating wave system above, and application principle is identical.
Description
Technical Field
The invention relates to a rectification circuit. The self-commutation rectifying circuit can convert the reactive energy stored in inductive load or capacitive load or resistive load connected in series with DC reactor into functional quantity which can be used by load, and can greatly raise the power factor of resistive load. The method can be applied to electrochemical electrolysis systems, direct current smelting systems, motor excitation systems, integrated circuit systems and the like, and particularly has an important effect on direct current transmission systems. The system can be applied to a system with more than twelve pulses, and the application principle is the same.
Background
The rectifier circuit is a power electronic circuit which can convert alternating current into direct current and is composed of power electronic devices. The method is widely applied to various fields of industrial and agricultural production, social life, scientific experiments and the like.
The rectifier circuit is divided into bridge type (including six-phase star midpoint non-leading-out bridge type, equilateral hexagon bridge type), double reversed star type, single-phase full-wave midpoint leading-out, three-phase half-wave, three-phase zigzag type, six-phase star midpoint leading-out, six-phase fork type (double zigzag type) and other rectifier circuit forms according to the structure (see a design manual of a rectifier transformer used in the transformer industry).
The rectifier circuits are classified into full-control type, half-control type and non-phase-control type rectifier circuits according to the control type of the electronic device. Similarly, each phase-change group can be divided into a fully-controlled type and a non-phase-controlled type. But also by number of phases and output waveform, etc.
A six-pulse wave rectifier circuit system consisting of two series phase-changing groups is called a six-pulse wave bridge rectifier circuit and is a basic unit for forming a bridge rectifier circuit with more than twelve pulse waves.
The double-reverse star rectifier circuits mainly include a double-reverse star rectifier circuit with a balance reactor and a double-reverse star rectifier circuit (a three-phase five-limb double-reverse star rectifier circuit) in which a three-phase five-limb iron core is adopted for a transformer to cancel the balance reactor.
The bridge rectifier circuit is mainly applied to single-phase, three-phase star or angular bridge rectifier circuits. When the semi-controlled bridge rectifier circuit is connected with an inductive load, a freewheeling diode is connected to the two ends of the load to keep the passage of inductive current, so that dangerous overvoltage is prevented from being generated at the two ends of the inductive load when the controllable silicon is turned off, and the controllable silicon can be ensured to be conducted in a phase-change mode.
In practical operation of the rectifier circuit, due to the existence of the reactance of the transformer, the commutation cannot be completed instantaneously, but the current of the former rectifier arm of one commutation group of the rectifier circuit is reduced slowly, the current of the latter rectifier arm is increased slowly, and a phenomenon that the two rectifier arms work simultaneously occurs, which is called an overlapping phenomenon and is also called a commutation phenomenonaAnd the phase voltage e of the rectifier arm 2 to be conductedbAnd then the rectifying arm 2 starts conducting, and the load current starts to be transferred from the rectifying arm 1 to the rectifying arm 2, so that phase commutation is generated. Because of the existence of commutation reactance, commutation can not be completed instantly, and when the load current is completely transferred from the rectifying arm 1 to the rectifying arm 2, commutation is performedTo conclude, the electrical angle of time (duty cycle angle) over which the commutation is rectified is referred to as the commutation angle or overlap angle. The rectifier circuit may have a voltage dip (sudden voltage drop) during commutation.
In a controllable (phase-controlled) rectifier circuit, a thyristor regulates the magnitude of a direct voltage by controlling the phase of a gate trigger pulse, the functional relationship between the rectifier output direct voltage and a phase control angle α is called as a phase control characteristicd=Ud0COS α, wherein Ud0Is the ideal no-load DC output voltage (V) of the non-phase-controlled rectifier.
The output DC voltage of the phase control rectification circuit decreases along with the increase of the phase control angle (trigger delay angle) α when the phase control angle is larger than the critical phase control angle αLAt this time, the rectifier arm begins to conduct current in the negative half cycle of the AC voltage, and the critical phase control angle α of the rectifier circuitLAnd (3) pi/2-pi/p, wherein p is the pulse wave number.
For example, in a three-phase rectifier circuit, the electrical angle (time electrical angle) ξ =120 ° experienced by each of the rectifying arm operating times (durations) of one voltage cycle, and the operating duration of 120 ° may also be called the duty cycle angle of one rectifying arm, and the duty cycle angle of the rectifying arm is also the duty cycle angle of the load, i.e., the operating duration of the load.
Disclosure of Invention
From commutation rectifier circuit, characterized by: two sequentially conductive rectifying arms in a phase-changing group of the fully-controlled rectifying circuit are at the phase-changing point of the intersection point of phase voltage curves, the phase voltage of the conductive rectifying arm 1 is equal to the phase voltage of the rectifying arm 2 to be conductive, and the conductive rectifying arm 1 is triggered to be turned off by using a control gate at the phase-changing point or after the phase-changing point; the phase control of the rectifier arm 2 to be conducted is continued after the phase change point, and the phase control angle alpha is more than or equal to 0; when phase change is needed, the rectifier arm 2 is switched on by using a control gate trigger pulse to complete phase change;
after the commutation point, the rectifying arm 1 can be turned off in a delayed mode, the current continues to be conducted for a time electrical angle beta, wherein the beta is the turn-off angle of the rectifying arm 1 after the commutation point, and the beta is more than or equal to 0 and less than or equal to alpha.
The turn-off angle 0 of the rectifying arm 1 of the self-commutation rectifying circuit from a commutation point is not less than β and not more than α, the overlapping phenomenon can be eliminated when β = α =0, and the phase-control rectifying arm outputs a working period angle ξ with zero voltage when β =0 and α > 0n= α, and the phase-controlled rectifying arm outputs a duty cycle angle ξ with zero voltage when β > 0 and β < αnAnd (3) = α - β, and when β is more than 0 and β = α, the voltage control efficiency of the common phase control rectification circuit is equivalent and the overlapping phenomenon is eliminated.
The self-commutation rectifying circuit is mainly different from the original rectifying circuit in that a rectifying arm 1 which is conductive at a commutation point or after the commutation point is automatically turned off by using a control gate trigger pulse, and an overlapping phenomenon does not exist.
From commutation rectifier circuit, characterized by: in the rectifier circuit with more than two series phase-changing groups, a self-phase-changing rectification working method can be adopted in one phase-changing group, and the self-phase-changing rectifier circuit is called as a semi-self-phase-changing rectifier circuit;
wherein, the other phase-changing group has an overlapping phenomenon;
the rectifier circuit with more than two series phase-changing groups is a fully-controlled rectifier circuit or a semi-controlled rectifier circuit.
From commutation rectifier circuit, characterized by: the system comprises a fully-controlled or semi-controlled rectifying circuit, a load, or a reactive power conversion arm, or a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
wherein, the fully-controlled or semi-controlled rectifying circuit is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
the two ends of the load or the two ends of the load and direct current reactor series circuit are connected with reactive power conversion arms in parallel;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device.
The fully-controlled or semi-controlled rectifier circuit adopts a working method of a self-commutation rectifier circuit or a semi-self-commutation rectifier circuit.
From commutation rectifier circuit, characterized by: the three-phase full-control or half-control bridge type rectifier circuit comprises a three-phase full-control or half-control bridge type rectifier circuit and a load, or comprises a reactive power conversion arm, or comprises a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the three-phase full-control or half-control bridge rectifier circuit is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
the two ends of the load or the two ends of the load and direct current reactor series circuit are connected with reactive power conversion arms in parallel;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device. Fig. 1 and 2 show two circuit forms, and other circuit forms are the same as below.
From commutation rectifier circuit, characterized by: the three-phase full-control double-reverse star-shaped belt balancing reactor comprises a three-phase full-control double-reverse star-shaped belt balancing reactor rectifying circuit and a load, or comprises two reactive power conversion arms, or comprises a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the three-phase full-control double-reversed star-shaped belt balancing reactor rectifying circuit is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
two phase-change groups of the three-phase full-control double-inverted star-shaped band balance reactor rectifying circuit are respectively connected with a reactive power conversion arm in parallel.
Wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device. Fig. 3 shows one of the circuit forms, but also other circuit forms.
From commutation rectifier circuit, characterized by: the three-phase five-column full-control double-reverse star rectifier circuit without a balance reactor and a load or one or two reactive power conversion arms or a direct-current reactor are included;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the three-phase five-column full-control double-reversed star-shaped rectifying circuit without the balancing reactor is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
the three-phase five-column fully-controlled double-reversed-star rectifier circuit is characterized in that two phase-change groups of the three-phase five-column fully-controlled double-reversed-star rectifier circuit without the balancing reactor are respectively connected in parallel with a reactive power conversion arm or two phase-change groups of the three-phase five-column fully-controlled double-reversed-star rectifier circuit without the balancing reactor are connected in parallel with a reactive power conversion arm;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device. Fig. 4 shows one of the circuit forms, but also other circuit forms.
From commutation rectifier circuit, characterized by: the system comprises a fully-controlled six-phase star-shaped neutral point leading-out rectifying circuit and a load, or comprises a reactive power conversion arm, or comprises a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the fully-controlled six-phase star-shaped neutral point is led out of a rectifying circuit or is connected with a load, or is connected with a series circuit formed by connecting the load and a direct current reactor in series;
the two ends of the load or the two ends of the load and direct current reactor series circuit are connected with reactive power conversion arms in parallel;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device. Fig. 5 shows one of the circuit forms, but also other circuit forms.
From commutation rectifier circuit, characterized by: the device comprises a single-phase full-control or half-control bridge rectifier circuit, a load, or a reactive power conversion arm, or a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the single-phase full-control or half-control bridge rectifier circuit is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
the two ends of the load or the two ends of the load and direct current reactor series circuit are connected with reactive power conversion arms in parallel;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device. Fig. 6 and 7 show two circuit forms, and other circuit forms are also provided.
The reactive power conversion method of the self-commutation rectifying circuit is characterized in that: the self-commutation rectifying circuit with reactive conversion arm enters into the working period angle of the instant zero output voltage state, the rectifying circuit utilizes the non-abrupt change characteristic of inductive load or capacitive load current and voltage, and the reactive energy stored in the load is self-circulated between the reactive conversion arm and the load through the short circuit action of the reactive conversion arm to the load, thus becoming the active energy.
The reactive power conversion method of the self-commutation rectifying circuit is characterized in that: one phase-changing group of the semi-self phase-changing rectifying circuit with the reactive power conversion arm enters a working period angle with an instantaneous output voltage of a zero state and the other phase-changing group enters an overlapped working period angle (phase-changing angle), and the rectifying circuit generates voltage sudden drop; the rectification circuit utilizes the characteristic that current and voltage of an inductive load or a capacitive load cannot be suddenly changed, and the reactive energy stored on the load is self-circulated between the reactive conversion arm and the load through the short-circuit action of the reactive conversion arm on the load to become active energy.
A series circuit of a resistive load and a dc reactor in series may also be considered an inductive load.
When the discharge characteristic of the load needs to be controlled, the reactive conversion arm is formed by a controllable valve device, or is connected with one or two or three of an inductor, a capacitor and a resistor device in series, or is formed by the controllable valve device and is connected with one or two or three of the inductor, the capacitor and the resistor device in series.
The reactive power conversion method is divided into a rectification arm working time length control type, a cycle control type and the like according to the control type. The control type of the working time length of the rectifying arms is that the working time length of each rectifying arm has a reactive power conversion stage. The cycle control type is that one cycle carries out reactive power conversion, and the other cycle does not carry out reactive power conversion. By analogy, a plurality of transformation modes can be realized.
The terms all adopt the design and application manual of power electronic equipment compiled by the institute of Electrical and technology in China.
The non-phase control rectification circuit is an uncontrollable rectification circuit. The phase control rectification circuit is a controllable rectification circuit.
The controllable valve device forming the rectifying arm and the reactive conversion arm is a power electronic device with the conducting direction and the current path controllable in a bistable state, such as a turn-off thyristor, an insulated gate bipolar transistor IGBT, a common thyristor, a bidirectional thyristor formed by the turn-off thyristor and the like. The uncontrollable valve devices forming the rectifying arm and the reactive conversion arm are reverse blocking power electronic valve devices which can conduct current in the conducting direction without applying any control signal, such as common rectifying tubes, various diodes and the like.
When the reactive conversion arm is composed of a controllable valve device, the direct current voltage is in a positive or negative direction according to the property requirement of the capacitive load or the inductive load, the forward voltage state is ensured when the device is switched off, and the discharge direction of the capacitive load is ensured. When the reactive conversion arm is formed by an uncontrollable valve device (diode), the direct current voltage is connected in a reverse mode, and the negative pole of the reactive conversion arm can be connected with the positive pole of the direct current.
The energy-saving basic principle of the reactive power conversion method is that, taking large-scale electrolysis as an example, according to the angle analysis of inductance values in an electrolytic tank, because direct current in the electrolytic tank can be approximately considered to be a certain value in the electrical angle of the working time of a rectifying arm, and load inductance in the electrical angle of the working time of the rectifying arm can be approximately considered to be a certain value, energy per unit time length in any cycle can be approximately considered to be equal, the electrical angle of the working time of a load is the electrical angle of the working time of the rectifying arm, the electrical angle of the working time of the rectifying arm in a cycle is also called as a load working cycle angle ξ, for example, ξ =120 degrees, the working cycle angle can be decomposed into a rectifying working cycle angle ξzAnd a duty cycle angle ξ at which the sum phase control rectifying arm output voltage is zeron，ξnThe percentage of the total duty cycle angle ξ of a rectifying arm is ξ%, and in the case of extension, the duty cycle angle of the total rectifying arm output voltage zero loaded with one cycle is also ξnThe percentage of the duty cycle angle ξ in one cycle sum is also called ξ%, and the duty cycle angle of the load sum phase control rectifying arm output voltage in the whole rectifying whole process is also called ξnA percentage of the total duty cycle angle ξ, also called ξ%. if at ξnIn the phase-control rectifier arm, the rectifier circuit does not supply power to the load, the load runs by means of reactive energy stored in the rectifier circuit, ξ% of the reactive energy released by the load in a working period angle of the phase-control rectifier arm with zero output voltage accounts for the percentage of input energy, namely the percentage of load gain energy.
For example, in a phase-change group of a fully controlled rectifier circuit, at the intersection of the phase voltage curves of two successively conducting rectifier limbs, the phase voltage of the already conducting rectifier limb 1 is equal to the phase voltage of the rectifier limb 2 to be conducted, and the rectifier limb 1 is then switched off by means of a control gate trigger pulse, in which case the phase angle α = ξ of the rectifier limb 2 to be conducted is controlled by a phase angle α = ξnDuring the phase control period of the rectifier arm 2, the rectifier enters a state that the instantaneous output voltage is zero, and the electricity is output instantaneouslyThe electrical angle of the zero-pressed duty cycle angular operating duration is ξn. The self-commutation rectifying circuit utilizes the characteristic that the inductive current of the inductive load can not change suddenly within the working period angle with zero instantaneous output voltage, and the reactive energy stored on the inductive load is self-circulated between the reactive conversion arm and the load through the short circuit action of the reactive conversion arm on the load, so that the reactive energy becomes active energy.
Taking a three-phase bridge rectifier circuit as an example for chemical electrolysis, the working cycle angle of each rectifying arm is 120 degrees according to the analysis of a reactive power conversion method of a self-phase-conversion rectifier circuit, and the working cycle angle ξ of the rectifying arm 2 when the output voltage is zero for a period of timenWhen the reactive energy stored in the inductive load circulates in the form of a short circuit between the load and the reactive conversion arm, keeping the current in the cell constant and converting the reactive energy into an active energy, assume the artificial formation ξnIf the energy per electrical angle of the load is equal, 10 °/120 ° × 100% =8.33%, and 8.33% of the operating electrical angles of the system are supplied to the load by using the reactive energy in the inductive load.
The self-phase-conversion rectifying circuit or the fully-controlled bridge type rectifying circuit with the reactive conversion arm is butted with the inverter circuit, namely a basic converter unit of the direct current transmission system. The self-commutated rectifier circuit may have a reactive converter arm, but it must be formed by a controllable valve device. The existing non-self-commutation rectifying circuit can generate instantaneous voltage sudden drop during commutation or deep control at the rectifying circuit side of a direct current transmission system, an ultrahigh voltage line is a capacitive load and has the capacity of keeping voltage unchanged instantaneously, reactive power is sent back to the rectifying side at the moment, the rectifying circuit is changed into an inverter circuit, instantaneous inversion occurs, the inverter circuit side is changed into a rectifying circuit, and the instantaneous rectification occurs. The energy loss is a minor factor and has a significant impact on the generator. This phenomenon can be called as the instantaneous inversion phenomenon of the capacitive load rectification process and the instantaneous rectification phenomenon of the inversion process, and can also be called as the instantaneous inverse operation of the current transformation circuit. A controllable reactive conversion arm is arranged on a rectifying circuit or a self-phase-conversion rectifying circuit, so that energy on the side of the inverting circuit is not transmitted to the rectifying side. Or a self-phase-change rectification circuit without a reactive conversion arm is adopted, the phase-change angle gamma =0 is matched with the rectification arms 1 and 2 to control the voltage in a phase-controlled manner, so that the output voltage of the rectification circuit is stable during the phase-controlled period, and the phenomenon of instantaneous reverse operation of the converter circuit is eliminated. The control efficiency of the phase control angle of the self-commutation rectifying circuit to the direct-current voltage is far higher than that of a common rectifying circuit. In principle, only one set of reactive conversion arm is needed for the direct current transmission system, but if the rectifying circuit and the inverter circuit are far away, the line loss is too large by using one set of line, and the direct current transmission system is unfavorable for tide control.
The self-commutation rectifying circuit has the beneficial effects that: the method has the advantages of eliminating the overlapping phenomenon of the rectifying circuit (which is the most important great advantage compared with other rectifying circuits), saving energy, eliminating the instant reverse operation of the capacitive load converter circuit, improving the yield, ensuring the system safety, having high voltage phase control efficiency, reducing ripple voltage under the same phase control angle compared with other rectifying circuits, and the like.
Drawings
Fig. 1 is an electrical schematic diagram of a novel rectifier circuit.
Fig. 2 is an electrical schematic diagram of the novel rectifier circuit.
Fig. 3 is an electrical schematic diagram of the novel rectifier circuit.
Fig. 4 is an electrical schematic diagram of the novel rectifier circuit.
Fig. 5 is an electrical schematic diagram of the novel rectifier circuit.
Fig. 6 is an electrical schematic diagram of a novel rectifier circuit.
Fig. 7 is an electrical schematic diagram of a novel rectifier circuit.
Fig. 8 is an electrical schematic diagram of a novel rectifier circuit.
Wherein,
1 is a rectifying arm of a rectifying circuit.
And 2 is a reactive conversion arm.
And 3 is a load.
And 4 is a direct current reactor.
And 5 is a valve side winding.
Detailed Description
The invention is not totally listed in the patent because of too many forms of rectifier circuits, but any rectifier circuit structure which is derived by utilizing a self-commutation method and a self-commutation rectifier circuit reactive power conversion method in the rectification process of the rectifier circuit and combining with the common knowledge of technical personnel in the rectifier industry is the protection scope of the patent, such as a twelve-pulse or more rectifier circuit, a same-phase inverse parallel rectifier circuit, other rectifier circuit forms with reactive power conversion arms, and the like.
Example 1, a certain manganese electrolysis enterprise, a ZHSSPZ-10000/35 rectifier transformer, a transformer high voltage of 35KV, a transformer low voltage of 198V-290V, a positive and negative voltage regulation of 27 gears, and a voltage regulation range of 70% Udn-105% Udn. A rectifier cabinet: the structure of the three-phase fully-controlled bridge type rectifier circuit with a turn-off thyristor is shown in figure 1, and the three-phase fully-controlled bridge type rectifier circuit with the turn-off thyristor is an in-phase anti-parallel rectifier circuit.
1. To simplify the analysis, the reactance Xd = ∞ can be assumed by the electrolyzer of the dc output circuit.
2. Energy-saving data analysis:
simplified analysis, design of the rectifier circuit ξnThe working time of each rectifying arm of the three-phase fully-controlled bridge rectifying circuit is 120 degrees, the novel rectifying circuit can be considered as saving electricity charge altogether by 15/120 × 100% =12.5% due to short sight.
Claims (10)
1. From commutation rectifier circuit, characterized by: two sequentially conductive rectifying arms in a phase-changing group of the fully-controlled rectifying circuit are at the phase-changing point of the intersection point of phase voltage curves, the phase voltage of the conductive rectifying arm 1 is equal to the phase voltage of the rectifying arm 2 to be conductive, and the conductive rectifying arm 1 is triggered to be turned off by using a control gate at the phase-changing point or after the phase-changing point; the phase control angle alpha of the rectifying arm 2 to be conducted is more than or equal to 0; when phase change is needed, the rectifier arm 2 is switched on by using a control gate trigger pulse to complete phase change;
after the commutation point, the rectifying arm 1 can be turned off in a delayed mode, the current continues to be conducted for a time electrical angle beta, wherein the beta is the turn-off angle of the rectifying arm 1 after the commutation point, and the beta is more than or equal to 0 and less than or equal to alpha.
2. The self-commutated rectifier circuit as defined in claim 1, wherein: in the rectifier circuit with more than two series phase-changing groups, self-phase-changing rectification can be adopted in one phase-changing group, and the self-phase-changing rectifier circuit is called as a semi-self-phase-changing rectifier circuit;
the rectifier circuit with more than two series phase-changing groups is a fully-controlled rectifier circuit or a semi-controlled rectifier circuit.
3. The self-commutated rectifier circuit as defined in claim 1, wherein: the system comprises a fully-controlled or semi-controlled rectifying circuit, a load, or a reactive power conversion arm, or a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
wherein, the fully-controlled or semi-controlled rectifying circuit is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
the two ends of the load or the two ends of the load and direct current reactor series circuit are connected with reactive power conversion arms in parallel;
the reactive power conversion arm is composed of a controllable valve device or an uncontrollable valve device;
the fully-controlled or semi-controlled rectifier circuit adopts a working method of a self-commutation rectifier circuit or a semi-self-commutation rectifier circuit.
4. The self-commutated rectifier circuit of claim 3, wherein: the three-phase full-control or half-control bridge type rectifier circuit comprises a three-phase full-control or half-control bridge type rectifier circuit and a load, or comprises a reactive power conversion arm, or comprises a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the three-phase full-control or semi-control bridge type rectifying circuit is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
the two ends of the load or the two ends of the load and direct current reactor series circuit are connected with reactive power conversion arms in parallel;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device.
5. The self-commutated rectifier circuit of claim 3, wherein: the three-phase full-control double-reverse star-shaped belt balancing reactor comprises a three-phase full-control double-reverse star-shaped belt balancing reactor rectifying circuit and a load, or comprises two reactive power conversion arms, or comprises a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the three-phase full-control double-reversed star-shaped belt balancing reactor rectifying circuit is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
two phase-changing groups of the three-phase double-reverse star-shaped rectifying circuit are respectively connected with a reactive power conversion arm in parallel;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device.
6. The self-commutated rectifier circuit of claim 3, wherein: the three-phase five-column full-control double-reverse star rectifier circuit without a balance reactor and a load or one or two reactive power conversion arms or a direct-current reactor are included;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the three-phase five-column full-control double-reversed star-shaped rectifying circuit without the balancing reactor is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
the three-phase five-column fully-controlled double-reversed-star rectifier circuit is characterized in that two phase-change groups of the three-phase five-column fully-controlled double-reversed-star rectifier circuit without the balancing reactor are respectively connected in parallel with a reactive power conversion arm or two phase-change groups of the three-phase five-column fully-controlled double-reversed-star rectifier circuit without the balancing reactor are connected in parallel with a reactive power conversion arm;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device.
7. The self-commutated rectifier circuit of claim 3, wherein: the system comprises a fully-controlled six-phase star-shaped neutral point leading-out rectifying circuit and a load, or comprises a reactive power conversion arm, or comprises a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the fully-controlled six-phase star-shaped neutral point is led out of a rectifying circuit or is connected with a load, or is connected with a series circuit formed by connecting the load and a direct current reactor in series;
the two ends of the load or the two ends of the load and direct current reactor series circuit are connected with reactive power conversion arms in parallel;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device.
8. The self-commutated rectifier circuit of claim 3, wherein: the device comprises a single-phase full-control or half-control bridge rectifier circuit, a load, or a reactive power conversion arm, or a direct current reactor;
wherein, the load and the DC reactor are connected in series to form a series circuit;
the single-phase full-control or half-control bridge rectifier circuit is connected with a load or a series circuit formed by connecting the load and a direct current reactor in series;
the two ends of the load or the two ends of the load and direct current reactor series circuit are connected with reactive power conversion arms in parallel;
wherein, the reactive conversion arm is composed of a controllable valve device or an uncontrollable valve device.
9. The reactive power conversion method of the self-commutation rectifying circuit is characterized in that: the self-commutation rectifying circuit with reactive conversion arm enters into the working period angle of the instant zero output voltage state, the rectifying circuit utilizes the non-abrupt change characteristic of inductive load or capacitive load current and voltage, and the reactive energy stored in the load is self-circulated between the reactive conversion arm and the load through the short circuit action of the reactive conversion arm to the load, thus becoming the active energy.
10. The reactive power conversion method of the self-commutation rectifying circuit is characterized in that: one phase-changing group of the semi-self phase-changing rectifying circuit with the reactive power conversion arm enters a working period angle with an instantaneous output voltage of a zero state and the other phase-changing group enters an overlapped working period angle, and the rectifying circuit generates voltage sudden drop; the rectification circuit utilizes the characteristic that current and voltage of an inductive load or a capacitive load cannot be suddenly changed, and the reactive energy stored on the load is self-circulated between the reactive conversion arm and the load through the short-circuit action of the reactive conversion arm on the load to become active energy.
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| CN201710808179.7A CN107395034A (en) | 2017-09-09 | 2017-09-09 | From commutation rectification circuit and idle method for transformation |
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| CN201710808179.7A CN107395034A (en) | 2017-09-09 | 2017-09-09 | From commutation rectification circuit and idle method for transformation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108075636A (en) * | 2018-01-10 | 2018-05-25 | 上海英联电子系统有限公司 | Novel flexible commutation control algolithm applied to BUCK type three-phase pfc circuits |
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