CN116754883A - Multifunctional detection equipment and detection method for reactive power compensation device - Google Patents
Multifunctional detection equipment and detection method for reactive power compensation device Download PDFInfo
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Abstract
The invention belongs to the field of electric power detection, and provides a multifunctional detection device and a detection method of a reactive power compensation device, which effectively replace the traditional reactive power compensation detection device and meet the functional test and performance test of the reactive power compensation device, and the technical scheme is as follows: comprises an analog load unit and an equipment control unit; the device control unit is configured to: when the reactive power compensation device to be tested is connected with a power grid, controlling the analog load unit to access the power grid, generating an analog load with adjustable reactive power by the analog load unit, calculating reactive power and power factors after the reactive power compensation device to be tested detects a voltage signal and a current signal provided by the analog load, and controlling corresponding capacitive branch investment in the reactive power compensation device to be tested according to a calculation result; and after all the capacitor branches in the reactive power device to be tested are put into operation data of the reactive power compensation device to be tested are obtained according to the corresponding test command, and specific performance detection results are obtained according to the operation data and the set judgment basis.
Description
Technical Field
The invention belongs to the field of power detection, and particularly relates to a multifunctional detection device and a detection method of a reactive power compensation device.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Reactive power compensation devices are widely applied in various fields such as automobile manufacturing, metallurgy, coal, distribution areas and the like in recent years, rapid change of loads requires that the reactive power compensation devices have extremely high response speed, and part of the reactive power compensation devices have a function of filtering harmonic waves, so that higher requirements are also put forward on reactive power compensation device detection equipment.
The inventor finds that the load unit of the conventional reactive compensation device detection equipment consists of a large number of inductors and resistors, and the inductors and the resistors provide reactive power and active power required for detection. The load unit provides all inductive reactive power and part of active power of the reactive power compensation device to be tested, so that the load unit occupies a large area, has high loss and has low efficiency; meanwhile, the required voltage regulator has larger capacity.
The novel reactive power compensation device detection equipment consists of an energy feedback load, a power distribution cabinet and a power grid simulation cabinet. The energy feedback load provides various loads required by the detection of the reactive compensation device; the power distribution cabinet provides power for the energy feedback and power grid simulation cabinet and the equipment to be tested; the power grid simulation cabinet can simulate a plurality of power grid parameters such as high and low voltage of a power grid, frequency of the power grid, unbalanced voltage and the like, and the novel reactive compensation device detection equipment is an ideal reactive compensation detection system, but the energy feedback load and the power grid simulation cabinet are high in price and large in occupied space, so that the novel reactive compensation device detection equipment is not widely adopted at the present stage.
Disclosure of Invention
In order to solve at least one technical problem in the background art, a first aspect of the present invention provides a multifunctional detection device for a reactive compensation device, which has low manufacturing cost, small volume and comprehensive testing function, and can meet the testing requirements of different types of reactive compensation devices.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a multifunctional detection device of a reactive compensation device comprises an analog load unit and a device control unit;
the device control unit is configured to: when the reactive power compensation device to be tested is connected with the power grid, controlling the analog load unit to access the power grid, and generating an analog load with adjustable reactive power by the analog load unit;
after the reactive power compensation device to be tested detects a voltage signal and a current signal provided by an analog load, calculating reactive power and a power factor, and controlling input of a corresponding capacitor branch in the reactive power compensation device to be tested according to a calculation result;
after all capacitor branches in the reactive power device to be tested are put into operation, the equipment control unit is configured to: and acquiring the operation data of the reactive compensation device to be tested according to the corresponding test command, and obtaining a specific performance detection result according to the operation data and the set judgment basis.
Further, the device further comprises a breaker, a first contactor, a second contactor and a static switch, the second breaker is closed, meanwhile, the first contactor is closed and the static switch is conducted, at the moment, the reactive compensation device to be tested is connected with the power grid, and when the second contactor is closed, the simulation load unit is connected with the power grid.
Further, the analog load unit is composed of delta-type transformers with a primary-secondary side turns ratio being a set proportion, wherein primary sides of the transformers are respectively connected with a power grid, secondary sides of the transformers are connected with three-phase current sampling of a reactive compensation device to be tested, and for the analog load unit, phase voltage signals and corresponding phase current signals are 30 degrees in phase difference.
Further, the apparatus further comprises an injection transformer and an inversion unit;
one end of the inversion unit is connected with the injection transformer, and the other end of the inversion unit is connected to the equipment control unit;
the device control unit is configured to: and sending a control command to the inversion unit, controlling the inversion unit to inject compensation voltage into the injection transformer, regulating the voltage of the input end of the reactive compensation device to be tested, and performing a test related to overvoltage and undervoltage of the reactive compensation device to be tested.
Further, the device further comprises a first current transformer and a voltage transformer, the first current transformer and the voltage transformer are arranged between the injection transformer and the static switch, the first current transformer and the voltage transformer are connected to a device control unit, and the device control unit is used for collecting signals of the first current transformer and the voltage transformer and calculating the times and the content of current harmonic waves at the output side of the injection transformer.
Further, the device also comprises a rectifying unit and a second current transformer, wherein one end of the rectifying unit is connected with the inversion unit, and the other end of the rectifying unit is respectively connected with the second current transformer and the device control unit;
the rectification unit is used for providing direct current support for the inversion unit; the rectification unit calculates the output of the reactive power compensation device to be tested in real time through the second current transformer and the voltage transformer in the rectification unit, and generates the inductive reactive power with equal capacity to offset the capacitive reactive power generated by the reactive power compensation device to be tested.
In order to solve the above problems, a second aspect of the present invention provides a multifunctional detection method for a reactive compensation device, which has comprehensive testing functions and can meet the testing requirements of different types of reactive compensation devices.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a multifunctional detection method of a reactive power compensation device comprises the following steps:
when the reactive power compensation device to be tested is connected with the power grid, controlling the analog load unit to access the power grid, and generating an analog load with adjustable reactive power by the analog load unit;
after the reactive power compensation device to be tested detects a voltage signal and a current signal provided by an analog load, calculating reactive power and a power factor, and controlling input of a corresponding capacitor branch in the reactive power compensation device to be tested according to a calculation result;
and after all the capacitor branches in the reactive power device to be tested are put into operation data of the reactive power compensation device to be tested are obtained according to the corresponding test command, and specific performance detection results are obtained according to the operation data and the set judgment basis.
Further, the performance detection results comprise overvoltage and undervoltage protection tests, reactive compensation tests, response time tests, phase-loss protection tests, harmonic suppression or harmonic filtering function tests, three-phase imbalance detection and inrush current detection of the reactive compensation device.
Further, when the overvoltage and undervoltage protection test is performed on the reactive power compensation device, after all the internal branches of the reactive power compensation device are put into operation, the equipment control unit sends a command to the inversion unit, the inversion unit injects compensation voltage into the injection transformer, and the output voltage of the injection transformer is changed by changing the magnitude and the direction of injection current so as to change the input voltage of the reactive power compensation device to be tested.
Further, when the three-phase unbalance compensation of the reactive power compensation device is detected, one or two phases of current sampling wires of the reactive power compensation device adopt wires with different sectional areas or lengths, the inductance of the sampling wires is different due to the fact that the sectional areas or lengths of the sampling wires are different, at the moment, the three-phase sampling currents are inconsistent, and the current value of the wires with small sectional areas or long lengths is smaller, so that unbalanced load is simulated.
The beneficial effects of the invention are as follows:
the reactive compensation device has low manufacturing cost and small volume, can realize the detection of each function of the reactive compensation device, effectively replaces the traditional reactive compensation detection device, and meets the function test and performance test of the reactive compensation device of production enterprises and inspection institutions.
The invention adopts the injection transformer to adjust the input voltage of the compensating device to be measured, has small transformer capacity and saves cost.
The invention uses the small-capacity transformer as the analog load unit, and has simple structure, no loss, low cost and small volume.
The reactive compensation device sends reactive power to the reactive compensation device through the rectifying unit, and the function test of the high-capacity reactive compensation device is realized under the condition that the capacity of the incoming power supply is small.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of a prior art first reactive compensation detection apparatus;
FIG. 2 is a schematic diagram of a second prior art reactive compensation detection apparatus;
FIG. 3 is a schematic diagram of reactive compensation detection equipment provided by an embodiment of the present invention;
fig. 4 is a phase relationship between a phase sampling voltage and a phase sampling current of an analog load according to an embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the present invention, terms such as "connected," "connected," and the like are to be construed broadly and mean either fixedly connected or integrally connected or detachably connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present invention can be determined according to circumstances by a person skilled in the relevant art or the art, and is not to be construed as limiting the present invention.
Fig. 1 is a schematic diagram of a conventional first reactive compensation device, where a conventional reactive compensation device comprises a load unit (an inductance cabinet and a resistance cabinet), a power distribution cabinet, and a voltage regulator. The load unit provides active power and reactive power required by the detection of the reactive compensation device; the power distribution cabinet provides power for the load unit, the voltage regulator and the equipment to be tested; the voltage regulator provides high and low voltages required by detection, and the load unit provides all inductive reactive power and part of active power of the reactive power compensation device to be detected, so that the load unit occupies a large area, has high loss and has low efficiency; meanwhile, the required voltage regulator has larger capacity.
Fig. 2 is a schematic diagram of a second conventional reactive compensation detection device, which is composed of an energy feedback load, a power distribution cabinet and a power grid simulation cabinet. The energy feedback load provides various loads required by the detection of the reactive compensation device; the power distribution cabinet provides power for the energy feedback and power grid simulation cabinet and the equipment to be tested; the power grid simulation cabinet can simulate a plurality of power grid parameters such as high and low voltage of a power grid, frequency of the power grid, unbalanced voltage and the like, but the power grid simulation cabinet is high in price and large in occupied space, so that the power grid simulation cabinet is not widely used at present.
The invention provides a multifunctional detection device of a reactive compensation device, which is used for adjusting the voltage of an input end of the reactive compensation device to be detected through an injection transformer and an inversion unit. The rectifying unit receives the spontaneous current harmonic wave instructed by the equipment control unit and generates an equal-capacity inductive reactive power to offset the capacitive reactive power generated by the reactive power compensation device to be tested.
The static switch STS is used for rapidly cutting off the main loop, and ensuring the safe operation of the reactive compensation detection equipment. The analog load provides an analog load with a power factor of 0.866, and the inductive reactive power can be adjusted by setting the transformer transformation ratio. The equipment control unit calculates and detects the power grid parameters of the equipment source side and controls the inversion unit, the rectification unit, the static switch STS and the analog load unit.
Example 1
As shown in fig. 3, the present embodiment provides a reactive compensation performance detection device, which includes a circuit breaker QF2, an injection transformer T1, a first current transformer CT1, a voltage transformer PT1, a static switch STS, a rectifying unit, an inverting unit, a second current transformer CT2, a first contactor KM1, a second contactor KM2, an analog load unit, and a device control unit.
One end of the breaker QF2 is connected with a power grid, the other end of the breaker QF2 is connected with an injection transformer T1, a first current transformer CT1 and a voltage transformer PT1 are arranged between the injection transformer T1 and a static switch STS, and a second current transformer CT2 is arranged between the static switch STS and a first contactor KM 1;
one end of the rectifying unit is connected with the injection transformer T1, the other end of the rectifying unit is connected to the second current transformer CT2 through the rectifying unit, one end of the first contactor KM1 is connected to the second contactor KM2, and the other end of the first contactor KM1 is connected with the reactive compensation device to be tested;
one end of the second contactor KM2 is connected with the first contactor KM1, and the other end of the second contactor is connected to the reactive power compensation device to be tested through the analog load unit.
The device control unit is configured to: when the reactive power compensation device to be tested is connected with the power grid, controlling the analog load unit to access the power grid, and generating an analog load with adjustable reactive power by the analog load unit;
after the reactive power compensation device to be tested detects a voltage signal and a current signal provided by an analog load, calculating reactive power and a power factor, and controlling input of a corresponding capacitor branch in the reactive power compensation device to be tested according to a calculation result;
after all capacitor branches in the reactive power device to be tested are put into operation, the equipment control unit is configured to: and acquiring the operation data of the reactive compensation device to be tested according to the corresponding test command, and obtaining a specific performance detection result according to the operation data and the set judgment basis.
As one or more embodiments, the analog load unit is composed of a delta transformer with a primary-secondary side turns ratio of a set ratio, for example, the delta transformer of the preferred 690:2 embodiment is composed of 6 taps.
It should be noted that, the setting of the transformer parameters can be selected by those skilled in the art according to the actual working conditions.
The primary side of the transformer is connected with the power grid voltage UAB, UBC, UCA, the secondary side Uac is connected with the equipment A phase detection current to be detected through a terminal, and for the delta transformer, the line voltage and the phase voltage are equal in amplitude and phase.
And changing the secondary side voltage signal of the transformer into a current signal by using the inductance of the current sampling line.
Meanwhile, due to the existence of the lead inductance, the current signal lags behind the voltage signal by 90 degrees, the phase difference between the analog load A-phase voltage signal (UA) and the A-phase current signal (IAC) is 30 degrees, and the reactive compensation device to be tested samples that the A-phase power factor is cos phi=0.866 at the moment as shown in fig. 4.
Similarly, the secondary side Uba of the transformer is connected with the detection current of the equipment B to be detected through a terminal, and the secondary side Ucb of the transformer is connected with the detection current of the equipment C to be detected through a terminal, so that the analog load provides an analog load with the power factor of 0.866, and the automatic switching of the reactive compensation device to be detected can be realized by setting the transformer transformation ratio to adjust the inductive reactive power.
Meanwhile, by changing the length or the sectional area of a current sampling line of a certain phase or two phases, a three-phase unbalanced analog load can be generated, and the device control unit controls the generation of the analog load through the contactor KM 2.
The device control unit is configured to: calculating the power grid parameters of the source side of the detection equipment by collecting a current signal of a first current transformer CT1 and a voltage signal of a voltage transformer PT 1; the equipment control unit is communicated with the rectifying and inverting module through an optical fiber and is used for transmitting an instruction and receiving module state information; the equipment control unit is communicated with the static switch STS through a network cable, and issues a command to control the on and off of a thyristor in the static switch STS; meanwhile, the device control unit controls the attraction and breaking of the contactor KM1 (comprising three single-phase contactors).
Further, the device control unit is further configured to: and sending a control command to the inversion unit, controlling the inversion unit to inject compensation voltage into the injection transformer, regulating the voltage of the input end of the reactive compensation device to be tested, and performing a test related to overvoltage and undervoltage of the reactive compensation device to be tested.
The rectification unit not only receives the self-current harmonic wave instructed by the equipment control unit, but also provides direct-current support for the inversion unit; the rectifying unit calculates the output of the reactive power compensation device to be tested in real time through the second current transformer CT2 and a voltage transformer in the rectifying unit, and generates an equal-capacity inductive reactive power to offset the capacitive reactive power generated by the reactive power compensation device to be tested.
In this embodiment, the inverter unit capacity is preferably 100kvar and the rectifier unit capacity is preferably 500kvar.
When the equipment control unit receives the fault state of the inversion unit and the rectification unit through communication, the fault state comprises: when the inversion unit and the rectification unit generate fault signals such as overvoltage, undervoltage, overcurrent, overheat, overload and the like, the equipment control unit rapidly turns off the static switch STS to ensure the safe operation of the reactive compensation detection equipment.
The invention provides a multifunctional detection method of a reactive power compensation device, wherein the detection equipment of the reactive power compensation device can realize performance tests such as overvoltage, undervoltage protection test, reactive power compensation test, response time test, phase-loss protection test, harmonic suppression or harmonic filtering function test, three-phase unbalance detection, inrush current detection and the like of the reactive power compensation device.
When the reactive compensation device to be tested is connected with the power grid, the simulation load unit is controlled to be connected with the power grid, and the simulation load unit generates a simulation load with adjustable reactive power;
after the reactive power compensation device to be tested detects a voltage signal and a current signal provided by an analog load, calculating reactive power and a power factor, and controlling input of a corresponding capacitor branch in the reactive power compensation device to be tested according to a calculation result;
and after all the capacitor branches in the reactive power device to be tested are put into operation data of the reactive power compensation device to be tested are obtained according to the corresponding test command, and specific performance detection results are obtained according to the operation data and the set judgment basis.
Example two
When overvoltage and undervoltage protection detection is performed on the reactive power compensation device to be detected, the embodiment provides a multifunctional detection method of the reactive power compensation device, which comprises the following steps:
closing a breaker QF2, and controlling the suction of an alternating-current contactor KM1 and the conduction of a static switch STS by an equipment control unit, wherein the reactive compensation device to be tested is connected with a power grid at the moment;
the equipment control unit controls the AC contactor KM2 to be attracted, the analog load unit is connected to a power grid, and at the moment, the analog load unit generates an analog load with a three-phase power factor of 0.866 and adjustable reactive power;
and after the reactive power compensation device to be tested detects the voltage signal and the current signal provided by the analog load unit, calculating reactive power and a power factor, and inputting the reactive power and the power factor into a corresponding capacitor branch in the reactive power compensation device according to a calculation result.
At this time, the rectifying unit samples the current signal of the current transformer CT2 and the voltage signal of the voltage transformer in the rectifying unit, calculates the input dead quantity of the reactive power compensation device to be tested, and sends out an equivalent inductive reactive power to offset the input capacitive reactive power of the reactive power compensation device to be tested.
After all the inner branches of the reactive power device are put into operation, the equipment control unit sends an instruction to the inversion unit through the optical fiber, the inversion unit injects compensation voltage into the injection transformer, and the output voltage of the injection transformer is changed by changing the magnitude and the direction of injection current so as to change the input voltage of the reactive power compensation device to be tested.
The equipment control unit detects the voltage of the input end of the reactive compensation device to be detected in real time by sampling the PT1 signal of the voltage transformer, and observes the cutting-off condition of the reactive compensation device when the voltage of the input end of the reactive compensation device to be detected reaches the set value of overvoltage or undervoltage.
And if the reactive power compensation device to be tested cuts off the input capacitor bank in a specified time, the overvoltage and undervoltage protection function of the reactive power compensation device to be tested is qualified.
The rectifying unit receives the command of the equipment control unit, not only provides direct current support for the inversion unit, but also gives out equivalent inductive reactive power to offset the capacitive reactive power of the compensation device, so that the current on the power grid side is small, and the large-capacity detection of the reactive power compensation device to be detected is realized under the condition that the total incoming line power supply capacity is small.
The predetermined time may be set according to actual conditions, and the embodiment is not particularly limited.
Example III
When the reactive power compensation detection is performed on the reactive power compensation device to be detected, the embodiment provides a multifunctional detection method of the reactive power compensation device, which comprises the following steps:
and closing the breaker QF2, and controlling the suction of the alternating-current contactor KM1 and the conduction of the static switch STS by the equipment control unit, wherein the reactive compensation device to be tested is connected with the power grid at the moment.
The equipment control unit controls the suction of the alternating-current contactor KM2, the analog load unit is connected to a power grid, and the analog load unit generates an analog load with the three-phase power factor of 0.866 and adjustable reactive power;
after the reactive power compensation device to be tested detects the voltage signal and the current signal provided by the analog load, the reactive power and the power factor are calculated, and the reactive power and the power factor are input into a capacitor branch in the reactive power compensation device according to the calculation result.
Because the analog load is a constant value, the compensating device to be tested can be put into operation all by all groups. At this time, the rectifying unit samples the current signal of the current transformer CT2 and the voltage signal of the voltage transformer in the rectifying unit, calculates the input dead quantity of the reactive power compensation device to be tested, and sends out an equivalent inductive reactive power to offset the input capacitive reactive power of the reactive power compensation device to be tested.
And after the compensation device to be tested is fully put into operation, observing the current of each group of compensation branches, and judging whether the compensation branches are normal or not. The equipment control unit controls the AC contactor KM2 to be disconnected, and the situation of the reactive compensation device in path-by-path cutting is observed.
Example IV
When detecting the response time of the reactive power compensation device to be detected, the embodiment provides a multifunctional detection method of the reactive power compensation device, which comprises the following steps:
and closing the breaker QF2, and controlling the suction of the alternating-current contactor KM1 and the conduction of the static switch STS by the equipment control unit, wherein the reactive compensation device to be tested is connected with the power grid at the moment. The equipment control unit controls the AC contactor KM2 to be attracted, the analog load unit is connected to a power grid, and at the moment, the analog load unit generates an analog load with the three-phase power factor of 0.866 and adjustable reactive power.
Recording sampling current abrupt change time T1 of the reactive compensation device to be tested by using an oscilloscope, calculating reactive power and power factor of an analog load after the reactive compensation device to be tested detects voltage signals and current signals, and inputting the reactive power and the power factor into a capacitor branch in the reactive compensation device, wherein at the moment, recording output current change time T2 of the reactive compensation device to be tested by using the oscilloscope, wherein T2-T1 is the response time of the compensation device.
Example five
When the phase-failure protection detection is performed on the reactive power compensation device to be detected, the embodiment provides a multifunctional detection method of the reactive power compensation device, which comprises the following steps:
and closing the breaker QF2, and controlling the suction of the alternating-current contactor KM1 and the conduction of the static switch STS by the equipment control unit, wherein the reactive compensation device to be tested is connected with the power grid at the moment. The equipment control unit controls the AC contactor KM2 to be attracted, the analog load unit is connected to a power grid, and the analog load unit generates an analog load with the three-phase power factor of 0.866 and adjustable reactive power.
After the reactive power compensation device to be tested detects the voltage signal and the current signal provided by the analog load, the reactive power and the power factor are calculated, and the reactive power and the power factor are input into a capacitor branch in the reactive power compensation device according to the calculation result. Because the analog load is a constant value, the compensating device to be tested can be put into operation all by all groups.
At this time, the rectifying unit samples the current signal of the current transformer CT2 and the voltage signal of the voltage transformer in the rectifying unit, calculates the input dead quantity of the reactive power compensation device to be tested, and sends out an equivalent inductive reactive power to offset the input capacitive reactive power of the reactive power compensation device to be tested. When the to-be-tested compensation device is fully put into a period of time, the equipment control unit cuts off any one phase of the three single-phase alternating-current contactors, and the to-be-tested reactive compensation device is required to cut off all the put capacitor branches, so that the phase-failure protection function is qualified.
Example six
When harmonic suppression or harmonic filtering detection is performed on a reactive power compensation device to be detected, the embodiment provides a multifunctional detection method of the reactive power compensation device, which comprises the following steps:
and closing the breaker QF2, and controlling the suction of the alternating-current contactor KM1 and the conduction of the static switch STS by the equipment control unit, wherein the reactive compensation device to be tested is connected with the power grid at the moment. The equipment control unit controls the AC contactor KM2 to be attracted, the analog load unit is connected to a power grid, and at the moment, the analog load unit generates an analog load with the three-phase power factor of 0.866 and adjustable reactive power.
After the reactive power compensation device to be tested detects the voltage signal and the current signal provided by the analog load, the reactive power and the power factor are calculated, and the reactive power and the power factor are input into a capacitor branch in the reactive power compensation device according to the calculation result. The rectification unit samples a current signal of a current transformer CT2 and a voltage signal of a voltage transformer in the rectification unit, calculates the input non-work amount of the reactive power compensation device to be tested, and sends out an equivalent inductive reactive power to offset the input capacitive reactive power of the reactive power compensation device to be tested.
After all capacitor branches in the reactive power device are put into operation, the equipment control unit sends a harmonic output instruction to the rectifying unit, and after the rectifying unit receives the instruction, harmonic waves are injected into the power grid according to the harmonic times and amplitudes set by the equipment control unit. At this time, the device control unit samples the current signal of the current transformer CT1 and the voltage signal of the voltage transformer PT1, calculates the number of times and content of current harmonics injected into the output side of the transformer, and checks the passive harmonic filtering or suppressing capability of the reactive compensation device.
Example seven
When three-phase unbalance compensation of the reactive power compensation device to be tested is detected, the embodiment provides a multifunctional detection method of the reactive power compensation device, which comprises the following steps:
one or two phases of current sampling wires of the reactive compensation device adopt wires with different sectional areas or lengths, and as the sectional areas or lengths of the sampling wires are different, the inductance of the sampling wires is different, and at the moment, three-phase sampling currents are inconsistent, and the current values of the wires with small sectional areas or long lengths are smaller, so that unbalanced load can be simulated.
And closing the breaker QF2, and controlling the suction of the alternating-current contactor KM1 and the conduction of the static switch STS by the equipment control unit, wherein the reactive compensation device to be tested is connected with the power grid at the moment. The equipment control unit controls the AC contactor KM2 to be attracted, the analog load unit is connected to a power grid, and at the moment, the analog load unit generates an adjustable analog load with three-phase power factor of 0.866 and unbalanced three-phase current and power.
After the reactive power compensation device to be tested detects the voltage signal and the current signal provided by the analog load, the reactive power and the power factor are calculated, and the reactive power and the power factor are input into a capacitor branch in the reactive power compensation device according to the calculation result, so that the unbalanced compensation function of the device is tested. At this time, the rectifying unit samples the current signal of the current transformer CT2 and the voltage signal of the voltage transformer in the rectifying unit, calculates the input dead quantity of the reactive power compensation device to be tested, and sends out an equivalent inductive reactive power to offset the input capacitive reactive power of the reactive power compensation device to be tested.
Example eight
When the inrush current of the reactive power compensation device to be tested is detected, the embodiment provides a multifunctional detection method of the reactive power compensation device, which comprises the following steps:
and closing the breaker QF2, and controlling the suction of the alternating-current contactor KM1 and the conduction of the static switch STS by the equipment control unit, wherein the reactive compensation device to be tested is connected with the power grid at the moment. The equipment control unit controls the AC contactor KM2 to be attracted, the analog load unit is connected to a power grid, and the analog load unit generates an analog load with the three-phase power factor of 0.866 and adjustable reactive power.
After the reactive power compensation device to be tested detects the voltage signal and the current signal provided by the analog load, the reactive power and the power factor are calculated, and the reactive power and the power factor are input into a capacitor branch in the reactive power compensation device according to the calculation result. Because the analog load is a constant value, the compensating device to be tested can be put into operation all by all groups. When the device is put into the last group of capacitors, the equipment control unit detects the current value of the last group of capacitors when being put into the device through the current transformer CT1, the random input test is not less than m times, and if the maximum current value is less than n times of the rated current value of the capacitors, the current detection is proved to be qualified.
In the implementation, the random input test should be not less than 20 times, and the maximum inrush current value is less than 5 times of the rated current value of the capacitor.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The multifunctional detection equipment of the reactive compensation device is characterized by comprising an analog load unit and an equipment control unit;
the device control unit is configured to: when the reactive power compensation device to be tested is connected with the power grid, controlling the analog load unit to access the power grid, and generating an analog load with adjustable reactive power by the analog load unit;
after the reactive power compensation device to be tested detects a voltage signal and a current signal provided by an analog load, calculating reactive power and a power factor, and controlling input of a corresponding capacitor branch in the reactive power compensation device to be tested according to a calculation result;
after all capacitor branches in the reactive power device to be tested are put into operation, the equipment control unit is configured to: and acquiring the operation data of the reactive compensation device to be tested according to the corresponding test command, and obtaining a specific performance detection result according to the operation data and the set judgment basis.
2. The multifunctional detecting device for reactive power compensator according to claim 1, further comprising a circuit breaker, a first contactor, a second contactor and a static switch, wherein the circuit breaker is closed, and the first contactor is closed and the static switch is opened, at the moment, the reactive power compensator to be detected is connected with a power grid, and when the second contactor is closed, the analog load unit is connected with the power grid.
3. A multi-function test device for reactive power compensator as claimed in claim 1, characterized in that the analog load unit consists of delta-type transformers with a primary-secondary side turns ratio of a set ratio, wherein the primary side of the transformer is connected to the three phases of the power grid, respectively, and the secondary side is connected to the three phase current samples of the reactive power compensator to be tested, and for each phase of the analog load unit the phase voltage signal is 30 ° out of phase with the corresponding phase current signal.
4. A multi-function test device for a reactive power compensator as claimed in claim 1, further comprising an injection transformer and an inverter unit;
one end of the inversion unit is connected with the injection transformer, and the other end of the inversion unit is connected to the equipment control unit;
the device control unit is configured to: and sending a control command to the inversion unit, controlling the inversion unit to inject compensation voltage into the injection transformer, regulating the voltage of the input end of the reactive compensation device to be tested, and performing a test related to overvoltage and undervoltage of the reactive compensation device to be tested.
5. The multifunctional detecting device for reactive power compensation equipment according to claim 4, further comprising a first current transformer and a voltage transformer, wherein the first current transformer and the voltage transformer are arranged between the injection transformer and the static switch, the first current transformer and the voltage transformer are connected to a device control unit, and the device control unit is used for collecting signals of the first current transformer and the voltage transformer and calculating the times and the content of current harmonics at the output side of the injection transformer.
6. The multifunctional detection device of the reactive power compensation device according to claim 4, wherein the device further comprises a rectifying unit and a second current transformer, one end of the rectifying unit is connected with the inversion unit, and the other end of the rectifying unit is respectively connected with the second current transformer and the device control unit;
the rectification unit is used for providing direct current support for the inversion unit; the rectification unit calculates the output of the reactive power compensation device to be tested in real time through the second current transformer and the voltage transformer in the rectification unit, and generates the inductive reactive power with equal capacity to offset the capacitive reactive power generated by the reactive power compensation device to be tested.
7. The multifunctional detection method of the reactive power compensation device is characterized by comprising the following steps of:
when the reactive power compensation device to be tested is connected with the power grid, controlling the analog load unit to access the power grid, and generating an analog load with adjustable reactive power by the analog load unit;
after the reactive power compensation device to be tested detects a voltage signal and a current signal provided by an analog load, calculating reactive power and a power factor, and controlling input of a corresponding capacitor branch in the reactive power compensation device to be tested according to a calculation result;
and after all the capacitor branches in the reactive power device to be tested are put into operation data of the reactive power compensation device to be tested are obtained according to the corresponding test command, and specific performance detection results are obtained according to the operation data and the set judgment basis.
8. A multi-functional test method of a reactive power compensator according to claim 7,
the performance detection result comprises overvoltage and undervoltage protection tests, reactive power compensation tests, response time tests, phase-loss protection tests, harmonic suppression or harmonic filtering function tests, three-phase unbalance detection and inrush current detection of the reactive power compensation device.
9. The method for detecting reactive power compensator according to claim 7, wherein the device control unit sends instructions to the inverter unit after all the branches in the reactive power compensator are put into operation during the overvoltage and undervoltage protection test of the reactive power compensator, the inverter unit injects compensation voltage into the injection transformer, and the output voltage of the injection transformer is changed by changing the magnitude and direction of the injection current, so as to change the input voltage of the reactive power compensator to be detected.
10. The method for detecting reactive power compensator according to claim 7, wherein when detecting reactive power compensator three-phase unbalance compensation, one or two phases of current sampling wires of the reactive power compensator adopt wires with different sectional areas or lengths, and the sampling wires have different inductance due to different sectional areas or lengths of the sampling wires, and at the moment, three-phase sampling currents are inconsistent, and the current value of the wire with small sectional area or long length is smaller, so that unbalanced load is simulated.
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