CN106501740B - Superconducting magnet quench detection method and device - Google Patents
Superconducting magnet quench detection method and device Download PDFInfo
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- CN106501740B CN106501740B CN201610843208.9A CN201610843208A CN106501740B CN 106501740 B CN106501740 B CN 106501740B CN 201610843208 A CN201610843208 A CN 201610843208A CN 106501740 B CN106501740 B CN 106501740B
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Abstract
The invention provides a superconducting magnet quench detection method and device, the method includes detecting the voltage and current of each unit coil in real time; calculating the power difference between two adjacent unit coils, and solving the absolute value of the power difference between the unit coil and the two adjacent unit coils; and if the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, judging that the unit coil is in a power quench state. The invention detects the power quench state of the unit coil, and accurately positions the position of the unit coil in the power quench state through comparison; respectively detecting voltage and temperature quench states of the single coils, and accurately positioning the positions of the single coils in the voltage and temperature quench states step by step through comparison; the invention integrates the detection of the electric quantity and the non-electric quantity, and overcomes the defect of a single quench detection method. And meanwhile, a voltage correction coefficient is introduced, so that the reliability of superconducting magnet quench detection is greatly improved.
Description
Technical Field
The invention relates to a quench detection method, in particular to a quench detection method and a quench detection device for a superconducting magnet.
Background
The superconducting energy storage system can be used for improving the stability of the system, improving the power supply quality, storing electric energy in a dispersed power supply system containing new energy such as solar energy, wind energy and the like and improving the power output characteristic in a power system, and can also be used for an emergency power supply of important devices. These excellent properties of superconducting energy storage systems would bring immeasurable technical and economic benefits in power systems. When the superconducting energy storage system is applied to a power system, problems which need to be solved are brought, wherein quench of the superconducting magnet is one of key problems influencing safe and stable operation of the superconducting energy storage system.
Superconductors can exhibit superconducting characteristics only when specific conditions are satisfied. Once the conditions are broken, the magnet will quench. Because the superconducting energy storage device operating in the power system encounters various dynamic processes such as system short-circuit fault, and is subjected to the impact of large short-circuit current and unbalanced current and the effects of electromagnetic, mechanical stress and heat generated thereby, the superconducting magnet may be quenched. The superconducting magnet quench is accompanied by magnet overcurrent and heating, the magnet can be damaged by serious local temperature rise, if measures are not taken in time, a large amount of energy is dissipated in the form of heat energy through the coil, the magnet can be burnt, and the safe, stable and economic operation of a superconducting power system is further influenced.
As a core component of the superconducting energy storage system, the superconducting energy storage magnet can be in the structural form of a ring-shaped superconducting energy storage magnet, a parallel multi-solenoid-shaped superconducting energy storage magnet and a simple single solenoid-shaped superconducting energy storage magnet. The superconducting annular magnet is formed by arranging a plurality of unit coils along the circumferential direction, wherein each unit coil is used as a coil module of the magnet and is formed by connecting a plurality of single coils in series. The ring magnet involves unit coils, single coils, the number of coils being very large, up to hundreds, and quench detection being also much more complex than a single coil. How to timely and effectively detect the quench of the superconducting magnet and protect the quench becomes an important aspect of superconducting application, and has important practical significance.
Disclosure of Invention
When the superconducting magnet normally runs in a superconducting state, the superconducting magnet basically has no resistance, does not generate heat, and does not change voltage and temperature; when the system is in failure, the superconducting condition is damaged, the superconducting magnet enters a non-superconducting state, and the superconducting magnet generates heat, and the voltage and the temperature rise rapidly. Based on the above, in order to solve the problem of quench detection of the superconducting magnet, the invention provides a superconducting magnet quench detection method and device, which are used for detecting the power quench state of a unit coil and the voltage quench state and the temperature quench state of a single coil.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention provides a superconducting magnet quench detection method, which comprises the following steps:
detecting the voltage and current of each unit coil in real time;
calculating the power difference of two adjacent unit coils according to the voltage and the current of each unit coil, and solving the absolute value of the power difference between the unit coil and the two adjacent unit coils;
and if the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, judging that the unit coil is in a power quench state.
The superconducting magnet is formed by annularly arranging N unit coils, and each unit coil is formed by M single coils which are connected in series and provided with a temperature probe and a lead.
The calculating the power difference of the two adjacent unit coils according to the voltage and the current of each unit coil and the solving of the absolute value of the power difference between the unit coil and the two adjacent unit coils comprises:
P1＝(u1-u2)i1
P2＝(u2-u3)i2
…
Pn＝(un-un+1)in
…
PN＝(uN-u1)iN
wherein u isnIs the voltage of the nth unit coil, and N is 1,2nIs the current of the nth unit coil, and i1＝i2＝...＝in＝...＝iN；
Calculating the absolute value | P of the power difference between the unit coil and two adjacent unit coils1|、|P2|、...、|Pn|、...、|PN|。
If the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, the step of judging that the unit coil is in the power quench state comprises the following steps:
setting the power quench threshold to PquenchThe absolute value P of the power difference between the unit coil and two adjacent unit coils1|、|P2|、...、|Pn|、...、|PNL is respectively associated with PquenchComparing, if the absolute value of the power difference between the unit coil and the two adjacent coils is greater than PquenchIt indicates that the unit coil is in a power quench state.
If the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, indicating that the unit coil is in the power quench state includes:
setting the power delay constant value to NPWhen the absolute value of the power difference between a certain unit coil and two adjacent coils exceeds PquenchSustained NPAnd when the sampling point is detected, the unit coil is in a power quench state.
If the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, the step of judging that the unit coil is in the power quench state comprises the following steps:
and respectively detecting the voltage quench state and/or the temperature quench state of the single coil.
The detecting of the voltage quench state of the single coil comprises the following steps:
let the collection time interval of voltage and current be Deltat1Detecting the current and the voltage of each single coil in real time, taking each H sampling points as a group, solving the average value of the current of each group, and calculating the induction voltage u of a certain single coil according to the inductance value L of the single coilLThe method comprises the following steps:
wherein ilThe current of the l sampling point;
calculating the average value u of two adjacent groups of voltages at the same time, including:
wherein u islIs the voltage at the ith sample point;
according to u and uLCalculating the resistance voltage u of the single coilRThe method comprises the following steps:
uR＝u-uL
introducing a voltage correction coefficient alpha, comprising:
u′R＝u-αuL
wherein u isR' to the resistance voltage of the cell coil after introducing the voltage correction coefficient alpha,
u ' is the average voltage value u ' when the single coil is not in the voltage quenching state 'LThe induction voltage is the induction voltage when the single coil is not in the voltage quenching state;
setting the voltage quench threshold to uquenchWill uR' and uquenchComparison, if uR' greater than uquenchAnd indicating that the single coil is in a voltage quenching state.
Detecting a temperature quench condition of the cell coil includes:
the temperature probes arranged on the single coils detect the temperature of the single coils in real time, and the temperature acquisition time interval for acquiring the temperature of a certain single coil by the temperature probes is delta t2Calculating the temperature change rate v of a single coilTThe method comprises the following steps:
wherein, TkTemperature, T, of the monoblock coil acquired for the kth time of the temperature probek-1The temperature of the single coil collected by the temperature probe at the k-1 st time;
let the temperature quench threshold be vquenchThe rate of change v of the temperature of a single body coilTAnd vquenchBy comparison, if vTGreater than vquenchAnd indicating that the single coil is in a temperature quenching state.
The detecting of the temperature quench state of the single coil comprises:
setting the temperature rise delay constant value to NTV is to beTAnd vquenchMaking a comparison when vTOver vquenchSustained NTAfter sampling points, the single coil is in a temperature quenching state.
The invention also provides a superconducting magnet quench detection device, comprising:
means for detecting voltage and current of each unit coil in real time;
means for calculating a power difference between two adjacent element coils according to the voltage and current of each element coil, and solving an absolute value of the power difference between the element coil and the two adjacent element coils;
means for setting a power quench threshold; and
and the device is used for judging that the absolute values of the power differences between the unit coil and the two adjacent coils are larger than the power quench threshold value, and indicating that the unit coil is in a power quench state.
The superconducting magnet is formed by annularly arranging N unit coils, and each unit coil is formed by M single coils which are connected in series and provided with a temperature probe and a lead.
The device for calculating the power difference between two adjacent unit coils according to the voltage and the current of each unit coil and solving the power difference absolute value between the unit coil and the two adjacent unit coils comprises the following steps:
means for calculating the power difference between two adjacent element coils according to the following formula:
P1＝(u1-u2)i1
P2＝(u2-u3)i2
…
Pn＝(un-un+1)in
…
PN＝(uN-u1)iN
wherein u isnIs the voltage of the nth unit coil, and N is 1,2nIs the current of the nth unit coil, and i1＝i2＝...＝in＝...＝iN(ii) a And
and the device is used for solving the power difference absolute value between the unit coil and two adjacent unit coils.
The quench detection apparatus further includes:
for setting power delay timing value NPThe apparatus of (1); and
used for judging whether the absolute value of the power difference between a certain unit coil and two adjacent coils exceeds PquenchSustained NPAnd when the sampling point is detected, the unit coil is in a power quench state.
The quench detection apparatus further includes:
and the device is used for detecting the voltage quench state and the temperature quench state of the single coil.
The device for detecting the voltage quench state and the temperature quench state of the single coil comprises:
and a device for detecting the voltage quench state of the single coil.
The device for detecting the voltage quench state of the single coil comprises:
means for setting acquisition time intervals for the voltage and current;
means for detecting in real time the voltage and current of each cell coil;
means for setting a voltage quench threshold;
the device is used for introducing a voltage correction coefficient to calculate the resistance voltage of the single coil after the voltage correction coefficient is introduced; and
and the device is used for judging that the resistance voltage of the single coil is greater than the voltage quench threshold value after the voltage correction coefficient is introduced, and indicating that the single coil is in a voltage quench state.
The device for introducing the voltage correction coefficient to calculate the resistance voltage of the single coil after the voltage correction coefficient is introduced comprises the following steps:
and a device for taking each H sampling points as a group, solving the average value of the current of each group, and calculating the induction voltage of a single coil according to the inductance value L of the single coil by the following formula:
wherein, Δ t1For the acquisition time interval of voltage and current, ilIs the current at the l-th sampling point, uLThe induced voltage of a certain single coil;
means for calculating an average of two sets of voltages adjacent at the same time by:
wherein u islIs the voltage of the l sampling point, u is the average value of two adjacent groups of voltages at the same time;
for according to u and uLMeans for calculating the resistance voltage of the cell coil by:
uR＝u-uL
wherein u isRIs the resistance voltage of the cell coil.
The device for introducing the voltage correction coefficient calculates the resistance voltage of the single coil after the voltage correction coefficient is introduced according to the following formula:
u′R＝u-αuL
wherein, alpha is a voltage correction coefficient,
uR'is the resistance voltage of the cell coil after the voltage correction coefficient is introduced, u' is the average voltage value, u 'when the cell coil is not in the voltage quenching state'LThe induced voltage is the induced voltage when the single coil is not in the voltage quenching state.
The device for detecting the voltage quench state and the temperature quench state of the single coil comprises:
and a device for detecting the temperature quench state of the single coil.
The apparatus for detecting a temperature quench state of the cell coil includes:
the temperature probe is arranged on the single coil and used for detecting the temperature of the single coil in real time;
a device for setting a temperature acquisition time interval for acquiring the temperature of a certain single coil by the temperature probe;
means for calculating a rate of temperature change of a certain cell coil by the following formula;
wherein v isTIs the rate of change of temperature, T, of a certain monolithic coilkTemperature, T, of the monoblock coil acquired for the kth time of the temperature probek-1Temperature of the single coil, delta t, acquired for the kth-1 th time of the temperature probe2Acquiring the temperature acquisition time interval of a certain single coil for the temperature probe;
for setting the temperature quench threshold vquenchThe apparatus of (1); and
for judging vTGreater than vquenchAnd then the single coil is in a temperature quenching state.
The apparatus for detecting a temperature quench state of the cell coil further includes:
for setting a constant value N of temperature rise delayTThe apparatus of (1);
for judging vTOver vquenchSustained NTAnd after sampling points, the device indicates that the single coil is in a temperature quenching state.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
1) the method and the device carry out power quench state detection on the unit coils in the superconducting magnet, and determine the power quench state of the corresponding unit coils through comparison, so that the position of the unit coils in the power quench state can be accurately positioned;
2) the invention detects the voltage quench state of the single coil, and determines the voltage quench state of the corresponding single coil through step-by-step comparison, thereby accurately positioning the position of the single coil in the voltage quench state;
3) the invention detects the temperature quench state of the single coil, and determines the temperature quench state of the corresponding single coil through step-by-step comparison, thereby accurately positioning the position of the single coil in the temperature quench state;
4) the invention integrates the detection of the electric quantity and the non-electric quantity, and overcomes the defect of a single quench detection method. And meanwhile, a voltage correction coefficient is introduced, so that the reliability of voltage quench detection is greatly improved.
Drawings
Fig. 1 is a schematic view of a superconducting magnet according to an embodiment of the present invention;
fig. 2 is a flowchart of a superconducting magnet quench detection method in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a superconducting magnet quench detection method, as shown in fig. 1, the superconducting magnet is formed by annularly arranging 16 unit coils, each unit coil is formed by connecting 2 single coils in series, and each single coil is provided with a temperature probe and a lead; as shown in fig. 2, the method includes:
the invention provides a superconducting magnet quench detection method, which comprises the following steps:
detecting the voltage and current of each unit coil in real time;
calculating the power difference of two adjacent unit coils according to the voltage and the current of each unit coil, and solving the absolute value of the power difference between the unit coil and the two adjacent unit coils;
and if the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, judging that the unit coil is in a power quench state.
The calculating the power difference of the two adjacent unit coils according to the voltage and the current of each unit coil and the solving of the absolute value of the power difference between the unit coil and the two adjacent unit coils comprises:
P1＝(u1-u2)i1
P2＝(u2-u3)i2
…
Pn＝(un-un+1)in
…
P16＝(u16-u1)i16
wherein u isnIs the voltage of the nth unit coil, and n is 1,2nIs the current of the nth unit coil, and i1＝i2＝...＝in＝...＝i16；
Calculating the absolute value | P of the power difference between two adjacent unit coils1|、|P2|、...、|Pn|、...、|P16|；
If the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, indicating that the unit coil is in the power quench state includes:
setting the power quench threshold to PquenchThe absolute value | P of the power difference between the unit coil and the adjacent two unit coils1|、|P2|、...、|Pn|、...、|P16L is respectively associated with PquenchComparing, if the absolute value of the power difference between the unit coil and the two adjacent coils is greater than PquenchIt indicates that the unit coil is in a power quench state.
If the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, the step of judging that the unit coil is in the power quench state comprises the following steps:
setting power delay timing NPWhen the absolute value of the power difference between a certain unit coil and two adjacent coils exceeds PquenchWhen the sampling time lasts for 3 sampling points, the sampling time is shownThe unit coil is in a power quench state. By setting the power delay timing NPCompared with the former method, the method reduces the misjudgment of the power quench state of the unit coil and improves the detection accuracy.
If the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, the step of judging that the unit coil is in the power quench state comprises the following steps:
and respectively detecting the voltage quench state and/or the temperature quench state of the single coil.
The detecting of the voltage quench state of the single coil comprises the following steps:
let the collection time interval of voltage and current be Deltat1Detecting the current and voltage of each single coil in real time, taking each 5 sampling points as one group, and calculating the average value I of the current of two adjacent groups1And I2And calculating the induced voltage u of a single coil according to the inductance L of the single coilLThe method comprises the following steps:
wherein ilThe current of the l sampling point;
calculating the average value u of two adjacent groups of voltages at the same time, including:
wherein u islIs the voltage at the ith sample point;
according to u and uLCalculating the resistance voltage u of the single coilRThe method comprises the following steps:
uR＝u-uL
introducing a voltage correction coefficient alpha, comprising:
u′R＝u-αuL
wherein u isR' to the resistance voltage of the cell coil after introducing the voltage correction coefficient alpha,
u ' is the average voltage value u ' when the single coil is not in the voltage quenching state 'LThe induction voltage is the induction voltage when the single coil is not in the voltage quenching state;
setting the voltage quench threshold to uquenchWill uR' and uquenchComparison, if uR' greater than uquenchAnd indicating that the single coil is in a voltage quenching state.
Detecting a temperature quench condition of the cell coil includes:
the temperature probes arranged on the single coils detect the temperature of the single coils in real time, and the temperature acquisition time interval for acquiring the temperature of a certain single coil by the temperature probes is delta t2Calculating the temperature change rate v of a single coilTThe method comprises the following steps:
wherein, TkTemperature, T, of the monoblock coil acquired for the kth time of the temperature probek-1The temperature of the single coil collected by the temperature probe at the k-1 st time;
let the temperature quench threshold be vquenchThe rate of change v of the temperature of a single body coilTAnd vquenchBy comparison, if vTGreater than vquenchAnd indicating that the single coil is in a temperature quenching state.
The detecting of the temperature quench state of the single coil comprises:
setting the temperature rise delay constant value to NTWhen v is equal to 3, v isTAnd vquenchMaking a comparison when vTOver vquenchAfter 3 sampling points are continuously carried out, the single coil is in a temperature quenching state. By setting the temperature rise delay constant value to be NTCompared with the former method, the method reduces misjudgment of the temperature quench state of the single coil and improves the accuracy of detection.
The invention also provides a superconducting magnet quench detection device, comprising:
means for detecting voltage and current of each unit coil in real time;
means for calculating a power difference between two adjacent element coils according to the voltage and current of each element coil, and solving an absolute value of the power difference between the element coil and the two adjacent element coils;
means for setting a power quench threshold; and
and the device is used for judging that the absolute values of the power differences between the unit coil and the two adjacent coils are larger than the power quench threshold value, and indicating that the unit coil is in a power quench state.
The device for calculating the power difference between two adjacent unit coils according to the voltage and the current of each unit coil and solving the power difference absolute value between the unit coil and the two adjacent unit coils comprises the following steps:
means for calculating the power difference between two adjacent element coils according to the following formula:
P1＝(u1-u2)i1
P2＝(u2-u3)i2
…
Pn＝(un-un+1)in
…
P16＝(u16-u1)i16
wherein u isnIs the voltage of the nth unit coil, and n is 1,2nIs the current of the nth unit coil, and i1＝i2＝...＝in＝...＝i16(ii) a And
for calculating absolute value | P of power difference between unit coil and two adjacent unit coils1|、|P2|、...、|Pn|、...、|P16L of the device.
The quench detection apparatus further includes:
for setting power delay timing value NPA device of 3; and
used for judging whether the absolute value of the power difference between a certain unit coil and two adjacent coils exceeds PquenchAnd when 3 sampling points are continuously carried out, the unit coil is in a power quench state.
The quench detection apparatus further includes:
and the device is used for detecting the voltage quench state and the temperature quench state of the single coil.
The device for detecting the voltage quench state and the temperature quench state of the single coil comprises:
and a device for detecting the voltage quench state of the single coil.
The device for detecting the voltage quench state of the single coil comprises:
means for setting acquisition time intervals for the voltage and current;
means for detecting in real time the voltage and current of each cell coil;
means for setting a voltage quench threshold;
the device is used for introducing a voltage correction coefficient to calculate the resistance voltage of the single coil after the voltage correction coefficient is introduced; and
and the device is used for judging that the resistance voltage of the single coil is greater than the voltage quench threshold value after the voltage correction coefficient is introduced, and indicating that the single coil is in a voltage quench state.
The device for introducing the voltage correction coefficient to calculate the resistance voltage of the single coil after the voltage correction coefficient is introduced comprises the following steps:
for taking each 5 sampling points as one group, calculating the average value I of the current of two adjacent groups1And I2And means for calculating an induced voltage of a single coil from the inductance value L of the single coil by the following formula:
wherein ilThe current of the l sampling point;
means for calculating an average of two sets of voltages adjacent at the same time by:
wherein u islIs the voltage of the l sampling point, u is the average value of two adjacent groups of voltages at the same time;
for according to u and uLMeans for calculating the resistance voltage of the cell coil by:
uR＝u-uL
wherein u isRIs the resistance voltage of the cell coil.
The device for introducing the voltage correction coefficient calculates the resistance voltage of the single coil after the voltage correction coefficient is introduced according to the following formula:
u′R＝u-αuL
wherein, alpha is a voltage correction coefficient,
uR'is the resistance voltage of the cell coil after the voltage correction coefficient is introduced, u' is the average voltage value, u 'when the cell coil is not in the voltage quenching state'LThe induced voltage is the induced voltage when the single coil is not in the voltage quenching state.
The device for detecting the voltage quench state and the temperature quench state of the single coil comprises:
and a device for detecting the temperature quench state of the single coil.
The apparatus for detecting a temperature quench state of the cell coil includes:
the temperature probe is arranged on the single coil and used for detecting the temperature of the single coil in real time;
a device for setting a temperature acquisition time interval for acquiring the temperature of a certain single coil by the temperature probe;
means for calculating a rate of temperature change of a certain cell coil by the following formula;
wherein v isTIs the rate of change of temperature, T, of a certain monolithic coilkTemperature, T, of the monoblock coil acquired for the kth time of the temperature probek-1Temperature of the single coil, delta t, acquired for the kth-1 th time of the temperature probe2Acquiring the temperature acquisition time interval of a certain single coil for the temperature probe;
for setting the temperature quench threshold vquenchThe apparatus of (1); and
for judging vTGreater than vquenchAnd then the single coil is in a temperature quenching state.
The apparatus for detecting a temperature quench state of the cell coil further includes:
for setting a constant value N of temperature rise delayTA device of 3;
for judging vTOver vquenchAnd after 3 sampling points are continuously carried out, the device indicates that the single coil is in a temperature quenching state.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (11)
1. A method of superconducting magnet quench detection, the method comprising:
detecting the voltage and current of each unit coil in real time;
calculating the power difference of two adjacent unit coils according to the voltage and the current of each unit coil, and solving the absolute value of the power difference between the unit coil and the two adjacent unit coils;
if the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, judging that the unit coil is in a power quench state;
the superconducting magnet is formed by annularly arranging N unit coils, and each unit coil consists of M single coils which are connected in series and provided with a temperature probe and a lead;
the calculating the power difference of the two adjacent unit coils according to the voltage and the current of each unit coil and the solving of the absolute value of the power difference between the unit coil and the two adjacent unit coils comprises:
wherein u isnIs the voltage of the nth unit coil, and N is 1,2nIs the current of the nth unit coil, and i1＝i2＝...＝in＝...＝iN；
Calculating the absolute value | P of the power difference between the unit coil and two adjacent unit coils1|、|P2|、...、|Pn|、...、|PN|；
If the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold, the step of judging that the unit coil is in the power quench state comprises the following steps:
respectively detecting the voltage quench state and/or the temperature quench state of the single coil;
the detecting of the voltage quench state of the single coil comprises the following steps:
let the collection time interval of voltage and current be Deltat1Detecting the current and the voltage of each single coil in real time, taking each H sampling points as a group, solving the average value of the current of each group, and calculating the induction voltage u of a certain single coil according to the inductance value L of the single coilLThe method comprises the following steps:
wherein ilThe current of the l sampling point;
calculating the average value u of two adjacent groups of voltages at the same time, including:
wherein u islIs the voltage at the ith sample point;
according to u and uLCalculating the resistance voltage u of the single coilRThe method comprises the following steps:
uR＝u-uL
introducing a voltage correction coefficient alpha, comprising:
uR′＝u-αuL
wherein u isR' to the resistance voltage of the cell coil after introducing the voltage correction coefficient alpha,
u ' is the average voltage value u ' when the single coil is not in the voltage quenching state 'LThe induction voltage is the induction voltage when the single coil is not in the voltage quenching state;
setting the voltage quench threshold to uquenchWill uR' and uquenchComparison, if uR' greater than uquenchAnd indicating that the single coil is in a voltage quenching state.
2. The superconducting magnet quench detection method according to claim 1, wherein the determining that the unit coil is in the power quench state if the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold value comprises:
setting the power quench threshold to PquenchThe absolute value | P of the power difference between the unit coil and the adjacent two unit coils1|、|P2|、...、|Pn|、...、|PNL is respectively associated with PquenchComparing, if the absolute value of the power difference between the unit coil and the two adjacent coils is greater than PquenchIt indicates that the unit coil is in a power quench state.
3. The superconducting magnet quench detection method according to claim 2, wherein the determining that the unit coil is in the power quench state if the absolute value of the power difference between the unit coil and the two adjacent coils is greater than the power quench threshold value comprises:
setting the power delay constant value to NPWhen the absolute value of the power difference between a certain unit coil and two adjacent coils exceeds PquenchSustained NPAnd when the sampling point is detected, the unit coil is in a power quench state.
4. The superconducting magnet quench detection method of claim 1, wherein the detecting the temperature quench state of the monoblock coil comprises:
the temperature probes arranged on the single coils detect the temperature of the single coils in real time, and the temperature acquisition time interval for acquiring the temperature of a certain single coil by the temperature probes is delta t2Calculating the temperature change rate v of a single coilTThe method comprises the following steps:
wherein, TkTemperature, T, of the monoblock coil acquired for the kth time of the temperature probek-1The temperature of the single coil collected by the temperature probe at the k-1 st time;
let the temperature quench threshold be vquenchThe rate of change v of the temperature of a single body coilTAnd vquenchBy comparison, if vTGreater than vquenchAnd indicating that the single coil is in a temperature quenching state.
5. The superconducting magnet quench detection method of claim 1, wherein the detecting the temperature quench state of the monoblock coil comprises:
setting the temperature rise delay constant value to NTV is to beTAnd vquenchMaking a comparison when vTOver vquenchSustained NTAfter sampling points, the single coil is in a temperature quenching state.
6. A superconducting magnet quench detection apparatus, the quench detection apparatus comprising:
means for detecting voltage and current of each unit coil in real time;
means for calculating a power difference between two adjacent element coils according to the voltage and current of each element coil, and solving an absolute value of the power difference between the element coil and the two adjacent element coils;
means for setting a power quench threshold; and
the device is used for judging whether the absolute values of the power difference between the unit coil and the two adjacent coils are larger than a power quench threshold value, and indicating that the unit coil is in a power quench state;
the superconducting magnet is formed by annularly arranging N unit coils, and each unit coil consists of M single coils which are connected in series and provided with a temperature probe and a lead;
the device for calculating the power difference between two adjacent unit coils according to the voltage and the current of each unit coil and solving the power difference absolute value between the unit coil and the two adjacent unit coils comprises the following steps:
means for calculating the power difference between two adjacent element coils according to the following formula:
wherein u isnIs the voltage of the nth unit coil, and N is 1,2nIs the current of the nth unit coil, and i1＝i2＝...＝in＝...＝iN(ii) a And
the device is used for solving the power difference absolute value between the unit coil and two adjacent unit coils;
the quench detection apparatus further includes:
means for detecting a voltage quench condition and a temperature quench condition of the cell coil;
the device for detecting the voltage quench state of the single coil comprises:
means for setting acquisition time intervals for the voltage and current;
means for detecting in real time the voltage and current of each cell coil;
means for setting a voltage quench threshold;
the device is used for introducing a voltage correction coefficient to calculate the resistance voltage of the single coil after the voltage correction coefficient is introduced; and
and the device is used for judging that the resistance voltage of the single coil is greater than the voltage quench threshold value after the voltage correction coefficient is introduced, and indicating that the single coil is in a voltage quench state.
7. The superconducting magnet quench detection apparatus of claim 6, further comprising:
for setting power delay timing value NPThe apparatus of (1); and
used for judging whether the absolute value of the power difference between a certain unit coil and two adjacent coils exceeds PquenchSustained NPAnd when the sampling point is detected, the unit coil is in a power quench state.
8. The superconducting magnet quench detection apparatus according to claim 6, wherein the means for introducing the voltage correction factor to calculate the resistance voltage of the monolithic coil after introducing the voltage correction factor comprises:
and a device for taking each H sampling points as a group, solving the average value of the current of each group, and calculating the induction voltage of a single coil according to the inductance value L of the single coil by the following formula:
wherein, Δ t1For the acquisition time interval of voltage and current, ilIs the current at the l-th sampling point, uLThe induced voltage of a certain single coil;
means for calculating an average of two sets of voltages adjacent at the same time by:
wherein u islIs the voltage of the l sampling point, u is the average value of two adjacent groups of voltages at the same time;
for according to u and uLMeans for calculating the resistance voltage of the cell coil by:
uR＝u-uL
wherein u isRIs the resistance voltage of the cell coil.
9. The superconducting magnet quench detection apparatus of claim 8, wherein the means for introducing the voltage correction factor calculates the resistance voltage of the monolithic coil after introducing the voltage correction factor by:
uR′＝u-αuL
wherein, alpha is a voltage correction coefficient,
uR'is the resistance voltage of the cell coil after the voltage correction coefficient is introduced, u' is the average voltage value, u 'when the cell coil is not in the voltage quenching state'LThe induced voltage is the induced voltage when the single coil is not in the voltage quenching state.
10. The superconducting magnet quench detection apparatus of claim 6 wherein the means for detecting a temperature quench condition of the monoblock coil comprises:
the temperature probe is arranged on the single coil and used for detecting the temperature of the single coil in real time;
a device for setting a temperature acquisition time interval for acquiring the temperature of a certain single coil by the temperature probe;
means for calculating a rate of temperature change of a certain cell coil by the following formula;
wherein v isTIs the rate of change of temperature, T, of a certain monolithic coilkTemperature, T, of the monoblock coil acquired for the kth time of the temperature probek-1Temperature of the single coil, delta t, acquired for the kth-1 th time of the temperature probe2Acquiring the temperature acquisition time interval of a certain single coil for the temperature probe;
for setting the temperature quench threshold vquenchThe apparatus of (1); and
for judging vTGreater than vquenchAnd then the single coil is in a temperature quenching state.
11. The superconducting magnet quench detection apparatus of claim 10, wherein the means for detecting a temperature quench state of the monolithic coil further comprises:
for setting a constant value N of temperature rise delayTThe apparatus of (1);
for judging vTOver vquenchSustained NTAnd after sampling points, the device indicates that the single coil is in a temperature quenching state.
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