CN109980664A - The amplitudes redundancy control method such as modulation degree based on injected zero-sequence voltage - Google Patents
The amplitudes redundancy control method such as modulation degree based on injected zero-sequence voltage Download PDFInfo
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- 238000004804 winding Methods 0.000 abstract description 6
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- 238000011217 control strategy Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
A kind of amplitudes redundancy control methods such as the modulation degree based on injected zero-sequence voltage give three-phase phase voltage to inject residual voltage first when ship high voltage shore power power-supply system breaks down, and change three-phase voltage phase difference, final to realize that three alternate line voltages of output are symmetrical.Residual voltage can be by keeping three-phase phase voltage modulation degree amplitude equal and corresponding mathematical operation is calculated.Ship shore electric power system includes Multiple coil phase-shifting transformer, and bank electricity network voltage is divided into the winding voltage of 3N group out of phase by Multiple coil phase-shifting transformer, and N is power module unit number；The rectifier of Multiple coil phase-shifting transformer connection three-phase, after the winding voltage of 3N group out of phase is rectified, respectively as the direct-flow input signal for being made of every group of H-bridge unit device for power switching, successively by inverter, filter and isolating transformer output after cascade.Control method serious forgiveness of the invention is high, realizes simple, has the advantages that operating cost is low and high reliablity.
Description
Technical Field
The invention belongs to the field of ship shore power, and relates to a modulation degree equal-amplitude redundancy control method based on zero-sequence voltage injection.
Background
The ship shore power is that when the ship is parked at a wharf, all ship diesel engine power stations stop running, and the ship power is provided by the shore power stations, so that the purposes of improving air quality, reducing noise and vibration in a port area and improving economic benefits are achieved.
The ship shore power is suitable for the fields of ports, shipyards, floating docks, ocean drilling platforms and the like. At present, the redundant control strategy of the high-voltage shore power supply of the ship mostly adopts the traditional symmetrical bypass control and the traditional asymmetrical bypass control. The symmetrical bypass control means that when a certain unit fails, the three-phase units at the corresponding positions need to be bypassed, phase voltages and line voltages of the three phases are output symmetrically, and derating operation is performed. According to the traditional asymmetric bypass control, the phase difference of phase voltages is changed, the line voltage symmetry between three phases is realized under the condition that only a bypass unit has a fault, the output three-phase voltage is higher than the traditional symmetric bypass voltage, the fault tolerance capability is higher than the traditional symmetric bypass control, the cost is low, and the modulation degree amplitude of the output three-phase voltage is unequal.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a modulation degree and amplitude redundancy control method based on zero sequence voltage injection, which has the advantages of higher fault tolerance rate than the traditional asymmetric bypass control, low cost and high reliability.
In order to achieve the above object, the modulation degree equal amplitude redundancy control method based on zero sequence voltage injection of the present invention includes:
1) judging whether the ship shore power supply system has a fault, if so, carrying out the operation of the step 2);
2) and injecting zero sequence voltage into the three-phase voltage, wherein the zero sequence voltage is obtained by performing mathematical operation by enabling the modulation degree amplitude of the three-phase voltage to be equal, and changing the phase difference of the three-phase voltage to enable the output three-phase line voltage to be symmetrical.
Step 1) if the ship shore powerThe power supply system does not have a fault and outputs three-phase voltage UOA，UOB，UOCThe vector of (a) is:
in the above formula, ma、mb、mcThe modulation degrees corresponding to the phase A, the phase B and the phase C before the fault; n is the number of the submodules; u shapedcIs the dc bus voltage.
After the step 2) is failed, if P modules of the A phase are failed, M modules of the B phase are failed, Z modules of the C phase are failed, and zero sequence voltage U is injectedOO'Outputting three-phase voltage U'O'A，U'O'B，U'O'CThe vector of (a) is:
wherein ,m1、m2、m3is a zero sequence voltage proportionality coefficient.
The vector of the output three-phase voltage after the fault occurs is obtained by the formulas (1) and (2):
and (3) obtaining the corresponding modulation degree after the fault as follows:
m 'in the above formula'a、m'b、m'cFor the A phase after failureAnd the modulation degrees corresponding to the phase B and the phase C.
|m'a|、|m'b|、|m'cL is modulation degree amplitude corresponding to A phase, B phase and C phase after fault, and l m'a|＝|m'b|＝|m'cDetecting and determining P, M, Z fault number of each phase submodule, and calculating zero sequence voltageCorresponding proportionality coefficient m1、m2、m3。
A. The number P, M, Z of modules with B, C phase faults satisfies the relation that P + M + Z is less than N, when all sub-modules have faults, the output three-phase voltage is 0, and the control method of the invention is not applicable. Modulation degree m 'corresponding to A phase, B phase and C phase after fault'a、m'b、m'cThe unsaturated condition is met and the control strategy will fail when the modulation degree is saturated.
Compared with the prior art, the invention has the following beneficial effects: the control method is improved on the basis of the traditional asymmetric bypass control, when a ship high-voltage shore power supply system fails, zero-sequence voltage is injected into three-phase voltage firstly, the phase difference of the three-phase voltage is changed, then the modulation degree amplitude is equal, the output three-phase line voltage is symmetric, and the fault tolerance capability is higher than that of the traditional asymmetric bypass control. The modulation degree equal-amplitude redundancy control method based on zero-sequence voltage injection ensures the stable operation of the shore power supply device and the ship electric equipment, is simple to realize, and has the advantages of low cost and high reliability.
Drawings
FIG. 1 is a schematic diagram of a high-voltage shore power supply system for a ship;
FIG. 2 is a schematic diagram of a power unit structure of a high-voltage shore power supply system for a ship;
FIG. 3 is a zero-sequence voltage vector diagram for fault injection of one module of the A-phase of the high-voltage shore power supply of the ship;
FIG. 4 is a zero sequence voltage injection vector diagram before and after a fault of a high-voltage shore power supply of a ship;
in FIGS. 1-2: 1-a multi-winding phase-shifting transformer; 2-a power unit integration cabinet; 3-a filter; 4-an isolation transformer; 5-a switch cabinet; 6-direct current low-frequency capacitor; 7-a three-phase rectifier; an 8-H bridge unit; 9-controlling the protection system; 10-load.
In the attached figures 3-4: u shapeOA、UOB、UOCThree-phase voltage before fault respectively; u shapeAB、UBC、UCAThe three-phase line voltage before and after the fault is respectively; u'O'A、U'O'B、U'O'CThe three-phase voltages after the fault are respectively.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1-2, the invention discloses a ship shore power supply system, the whole system adopts a three-phase uncontrolled rectification + chain structure, shore power grid voltage is firstly divided into 3N groups of windings with different phases through a multi-winding phase-shifting transformer 1, and N is the number of power module units. Then, 3N groups of winding voltages with different phases are rectified by a three-phase rectifier 7 and then respectively used as direct current input signals of each group of H-bridge units 8 formed by power switching devices, and after being cascaded, the three-phase voltages are output after being isolated by an inverter 8, an LC filter 3 and a transformer 4, so that power supply to a load is realized, and a switch cabinet 5 is arranged between the isolation transformer 4 and the load 10.
The control method of the invention comprises the following steps: when the ship high-voltage shore power supply system has a fault, zero-sequence voltage is injected into three-phase voltage, and the phase difference of the three-phase voltage is changed, so that the output three-phase line voltage is symmetrical. The zero sequence voltage is obtained by equalizing the modulation degree amplitude of the three-phase voltage and corresponding mathematical operation, as shown in fig. 4.
The zero sequence voltage is calculated as follows:
before the fault happens, three-phase voltage U is outputOA，UOB，UOCAs in equation (1), the three-phase voltage is symmetrical:
after the fault occurs, if P modules of the A phase fail, M modules of the B phase fail, Z modules of the C phase fail, zero sequence voltage is injected, and three-phase voltage U 'is output'O'A，U'O'B，U'O'CComprises the following steps:
wherein ,
the three-phase voltage output after the fault occurs is as follows according to the formulas (1) and (2):
the modulation degree corresponding to the three-phase voltage after the fault can be obtained by the formula (3) as follows:
[ m ] in the formula (4)'a|＝|m'b|＝|m'cI, detecting and determining the value of P, M, Z fault numbers of each phase sub-module, and calculating m through corresponding mathematical operation1，m2，m3To calculate the zero to be injectedSequence voltage
In the above formulae (1), (2), (3), (4):
ma，mb，mcthe modulation degrees corresponding to the phase A, the phase B and the phase C before the fault; n is the number of the submodules; u shapedcIs a dc bus voltage; m is1，m2，m3Is a zero sequence voltage proportionality coefficient; m'a，m'b，m'cAnd the three-phase voltage modulation degree after the fault is obtained.
Note: the above formula (4) satisfies the condition P + M + Z < N and M'a，m'b，m'cThe three-phase modulation degree is not saturated.
The control method of the invention is compared with the traditional asymmetric zero-sequence voltage injection control strategy as follows:
if the total number of modules N per phase is 10, a single module of phase a fails.
1. The invention is based on the modulation degree equal amplitude redundancy control strategy of zero sequence voltage injection;
as can be seen from fig. 3, the injected zero-sequence voltage after the fault and the modulation degree of the three-phase voltage are calculated as follows:
zero-sequence voltage three-phase voltage U 'injected after fault'O'A，U'O'B，U'O'CThe amplitude of (d) is:
in the formula (5), | m'a|＝|m'b|＝|m'c|，|UOO'|＝m1|UOATaking N as 10, the formula (5) can calculate: m is1＝0.0679。
The final injected zero sequence voltage is
M is to be1＝0.0679，m2＝0，m3Substituting equation (4) into equation (0) to obtain post-fault three-phase voltage modulation degree m'a，m'b，m'cComprises the following steps:
will | m'a|＝|m'b|＝|m'cSubstituting the phase voltage into the formula (6) to obtain the three-phase voltage modulation degree amplitude of m'a|＝|m'b|＝|m'c|＝1.0357|ma|；
2. Traditional asymmetric zero-sequence voltage injection control;
as can be seen from fig. 3, the injected zero-sequence voltage after the fault and the modulation degree of the three-phase voltage are calculated as follows:
zero-sequence voltage three-phase voltage U 'injected after fault'O'A，U'O'B，U'O'CComprises the following steps:
wherein, willSubstituting the formula (7) to obtain the three-phase voltage modulation degree as follows:
solving the three-phase voltage modulation degree m after the fault according to the formula (8) "a，mb"，mcThe amplitude of "can be given by the equation (9):
wherein ,|ma|＝|mb|＝|mc|。
The amplitude of the three-phase voltage modulation degree after the fault can be obtained by the formula (9) is as follows:
substituting 10 into the formula (10) to obtain a three-phase voltage modulation degree amplitude value when the A-phase fault is one sub-module:
in formulae (5) to (11), ma，mb，mcThe modulation degrees corresponding to the phase A, the phase B and the phase C before the fault; n is the number of the submodules; u shapedcIs a dc bus voltage; m is1，m2，m3Is a zero sequence voltage proportionality coefficient; m'a，m'b，m'cThree-phase voltage modulation degree m' for adopting modulation degree equal-amplitude redundancy control strategy based on zero-sequence voltage injection after fault "a，mb"，mcThe three-phase voltage modulation degree of the traditional asymmetric zero-sequence voltage injection control strategy is adopted after the fault occurs.
Comparing the formula (5) and the formula (11), when the module has a fault, the modulation amplitude of the three-phase voltage obtained by the control method of the invention is smaller than that obtained by the traditional control method, and the margin of the modulation degree reaching saturation is larger, so that the control method of the invention has higher fault tolerance rate compared with the traditional control method.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way, and it will be understood by those skilled in the art that several modifications and substitutions can be made to the technical solution of the present invention without departing from the basic concept of the present invention, and these modifications and substitutions will fall within the protective scope defined by the appended claims.
Claims (6)
1. A modulation degree equal amplitude redundancy control method based on zero sequence voltage injection is characterized by comprising the following steps:
1) judging whether the ship shore power supply system has a fault, if so, carrying out the operation of the step 2);
2) and injecting zero sequence voltage into the three-phase voltage, wherein the zero sequence voltage is obtained by performing mathematical operation by enabling the modulation degree amplitude of the three-phase voltage to be equal, and changing the phase difference of the three-phase voltage to enable the output three-phase line voltage to be symmetrical.
2. The modulation degree constant amplitude redundancy control method based on zero sequence voltage injection as claimed in claim 1, wherein the step 1) outputs three-phase voltage U if the ship shore power supply system is not in faultOA，UOB，UOCThe vector of (a) is:
in the above formula, ma、mb、mcThe modulation degrees corresponding to the phase A, the phase B and the phase C before the fault; n is the number of the submodules; u shapedcIs the dc bus voltage.
3. The modulation degree equiamplitude redundancy control method based on zero sequence voltage injection as claimed in claim 2, wherein the step 2) after the fault occurs, if P modules of A phase are failed, M modules of B phase are failed, Z modules of C phase are failed, and the zero sequence voltage U is injectedOO'Outputting three-phase voltage U'O'A，U'O'B，U'O'CThe vector of (a) is:
wherein ,m1、m2、m3is a zero sequence voltage proportionality coefficient.
4. The modulation degree equal-amplitude redundancy control method based on zero-sequence voltage injection as claimed in claim 3, characterized in that: A. the number P, M, Z of modules with B, C phase faults satisfies the relation P + M + Z < N.
5. The modulation degree equal-amplitude redundancy control method based on zero-sequence voltage injection as claimed in claim 3, characterized in that:
the vector of the output three-phase voltage after the fault occurs is obtained by the formulas (1) and (2):
and (3) obtaining the corresponding modulation degree after the fault as follows:
m 'in the above formula'a、m'b、m'cAnd the modulation degrees corresponding to the phase A, the phase B and the phase C after the fault.
6. The modulation degree equal-amplitude redundancy control method based on zero-sequence voltage injection as claimed in claim 5, characterized in that: l m'a|、|m'b|、|m'cL is modulation degree amplitude corresponding to A phase, B phase and C phase after fault, and l m'a|＝|m'b|＝|m'cDetecting and determining P, M, Z fault number of each phase submodule, and calculating zero sequence voltageCorresponding proportionality coefficient m1、m2、m3。
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| CN114063492A (en) * | 2021-09-30 | 2022-02-18 | 科华数据股份有限公司 | Energy-saving control method and device for power supply system rectifier module and storage medium |
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| CN104283219A (en) * | 2014-10-20 | 2015-01-14 | 中国矿业大学 | Voltage fluctuation restraining method for high-frequency zero-sequence voltage injection cascaded static synchronous compensator (STACOM) |
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| CN104283219A (en) * | 2014-10-20 | 2015-01-14 | 中国矿业大学 | Voltage fluctuation restraining method for high-frequency zero-sequence voltage injection cascaded static synchronous compensator (STACOM) |
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| 毛乾锟: "单相电压源整流器新型调制算法与控制策略的研究", 《电气应用》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114063492A (en) * | 2021-09-30 | 2022-02-18 | 科华数据股份有限公司 | Energy-saving control method and device for power supply system rectifier module and storage medium |
| CN114063492B (en) * | 2021-09-30 | 2024-04-19 | 科华数据股份有限公司 | Energy-saving control method, control device and storage medium for power supply system rectifying module |
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