CN109991499B - Detection device and method for dynamic response and harmonic suppression of reactive power compensation device - Google Patents
Detection device and method for dynamic response and harmonic suppression of reactive power compensation device Download PDFInfo
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Abstract
The invention discloses a detection device for dynamic response and harmonic suppression of a reactive power compensation device, which is characterized in that the voltage of a power grid is connected in series with an input buffer device after being input into a circuit breaker, and the output end of the input buffer device is connected with the input end of an alternating current side of a four-quadrant rectifying unit; the four-quadrant rectifying unit, the sinusoidal voltage inversion unit and the direct current buses of the load current generation unit are respectively connected in parallel and then connected to two ends of the energy storage unit; the output end of the sinusoidal voltage inversion unit is connected with an adjustable reactor in series and then is respectively connected with the output end of the load current generation unit and the input end of the output breaker; the circuit between the adjustable reactance and the input end of the output circuit breaker is connected with a first current transformer and a third current transformer in series, the output end of the load current generating unit is connected with a second current transformer, and the second current transformer is connected between the first current transformer and the third current transformer; the output end of the output circuit breaker is connected with the main loop of the reactive compensation device to be tested; the midpoint of the capacitor of the energy storage unit is connected with the neutral point of the power grid. The invention also discloses a control method.
Description
Technical Field
The invention relates to a low-voltage complete reactive compensation technology in the power industry, in particular to a detection device and a detection method for dynamic response and harmonic suppression of a reactive compensation device.
Background
The requirements of dynamic reactive compensation devices are becoming larger and larger when rapid impact load devices such as rolling mills, internal mixers, spot welders and the like are applied in a large quantity, the dynamic response time of the compensation devices is required to reach 20ms, the time from reactive load change to the total input of required compensation capacity is required, and the problems of under-compensation, over-compensation, voltage drop and the like can be caused if the compensation response is slow. With the manufacturer pushing out a dynamic reactive power compensation device with a response of tens of milliseconds, the detection of dynamic response time of tens of milliseconds in a 3C type test becomes a requirement. In addition, the reactive compensation type test also needs to be performed with a harmonic suppression or filtering effect, and as the capacitor type reactive compensation device is passive filtering, the harmonic suppression or filtering effect can be influenced by the background voltage harmonic wave and the source impedance at the power supply side, so that the test effect is different.
In the actual detection, the power supply of the power supply network is adopted to supply power to the tested equipment, and the reactive power and the harmonic current required by the test are generated through the actual reactive power, the harmonic and the active load to carry out the detection, so that the following problems exist: transient state is brought when the inductive reactive load is switched, and the response time of dynamic reactive compensation is influenced; the loss is large due to the adoption of an actual active load; most of the harmonic waves generated by the fixed load are not selectable in harmonic frequency; the actual load needs to be manually switched, the switching time of the interval is uncontrollable, and the dynamic response time test of restarting is influenced; the load size adjustment precision is limited and cannot be adjusted at will; when the electronic load generates active current, a feedback device is additionally added and connected to the power grid in parallel, and the feedback device can change the equivalent impedance of the power grid, so that the harmonic suppression or filtering effect test of reactive compensation is affected; the test system has the advantages that residual harmonic current or reactive current flows into a power grid due to the performance difference of the compensation device, so that the power factor of a power source side is lower; the conventional electronic load cannot generate the continuous multiple step reactive required for the pattern test.
The main reason for the above problems in the detection process is that the test power source is directly derived from the power supply grid, so the following situations can occur: the method comprises the steps that a certain background voltage harmonic exists, the harmonic can influence the harmonic suppression or filtering effect test of reactive compensation, and the change of source impedance can also influence the harmonic suppression or filtering effect test of reactive compensation; when the voltage of the power grid is changed or three phases are unbalanced, the change of the reactive compensation demand is caused, and the dynamic response time test of reactive compensation is influenced; when the power supply voltage required by the reactive compensation device is inconsistent with the power supply voltage, the system needs to be built again for testing; when the power frequency required by the reactive compensation device is inconsistent with the power frequency, the test cannot be performed by directly adopting the power supply of the power supply grid.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a detection device and a detection method for dynamic response and harmonic suppression of a reactive power compensation device, which can be used for detecting the dynamic response and harmonic suppression or filtering effect in a reactive power compensation device type test, and have the functions of stable voltage, small harmonic and flexible regulation of voltage and frequency, and also have the functions of generating a load current conveniently and flexibly, purifying a test power grid and saving electric energy.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the detection device for dynamic response and harmonic suppression of the reactive power compensation device is characterized in that a power grid voltage is connected in series to an input buffer device after passing through an input breaker, the output end of the input buffer device is connected with the input end of the alternating current side of the four-quadrant rectifying unit, and a fourth current transformer is arranged on a connecting circuit of the input buffer device and the input end of the four-quadrant rectifying unit; the four-quadrant rectifying unit, the sinusoidal voltage inversion unit and the direct current buses of the load current generation unit are respectively connected in parallel and then connected to two ends of the energy storage unit; the output end of the sinusoidal voltage inversion unit is connected with an adjustable reactor in series and then is respectively connected with the output end of the load current generation unit and the input end of the output breaker; the circuit between the adjustable reactance and the input end of the output circuit breaker is connected with a first current transformer and a third current transformer in series, the output end of the load current generating unit is connected with a second current transformer, and the second current transformer is connected between the first current transformer and the third current transformer; the output end of the output circuit breaker is connected with the main loop of the reactive compensation device to be tested; the midpoint of the capacitor of the energy storage unit is connected with the neutral point of the power grid; the execution of the actions of the units is controlled by a corresponding controller.
The input buffer device comprises an alternating current contactor and buffer resistors connected in parallel to two ends of the alternating current contactor, the buffer resistors are used for power-on buffering of the detection device, the resistors are connected in during power-on, and the contactor is attracted after the power-on is completed.
The first, second and third current transformers are respectively transformer secondary signals of the compensated current, the load current and the compensated current, and are used for detecting dynamic response or harmonic suppression effect of the reactive power compensation device, and the fourth current transformer CT4 is used for detecting a four-quadrant rectification controller.
The four-quadrant rectifying unit is composed of an input reactor and semiconductor electronic switches, the input end of the input reactor is connected with the output end of the input buffer device, and the output end of the input reactor is connected between the two semiconductor electronic switches connected in series. The four-quadrant rectification and the regulation control of the direct current bus voltage are realized, the pumping of the direct current bus voltage can be realized, and the power factor correction function of the power grid side of the detection device can also be realized.
The sinusoidal voltage inversion unit consists of a semiconductor electronic switch, a first output reactor and a filter capacitor; the middle of the two serially connected semiconductor electronic switches is connected with the input end of the first output reactor, and the output end of the first output reactor is respectively connected with the filter capacitor and the adjustable reactor. The sinusoidal voltage inversion unit adopts a PWM inversion mode to realize voltage inversion, and achieves the power supply aims of waveform sinusoidal output, small harmonic wave, stable voltage and flexible voltage and frequency adjustment.
The load current generating unit consists of a semiconductor electronic switch and a second output reactor; the middle of the two serially connected semiconductor electronic switches is connected with the input end of the second output reactor, and the output end of the second output reactor is connected with the third current transformer. The load current generating unit generates reactive current, harmonic current and active current required by test in a PWM inversion mode, can be programmed to realize impact load required by reactive compensation dynamic response, and can be programmed to generate harmonic current of required harmonic frequency; because the direct current bus of the load current generating unit is connected with the direct current bus of the four-quadrant rectifying unit and the sinusoidal voltage inversion unit to form an energy feedback channel, the load current generating unit saves the inversion part which is fed back to the alternating current side on one hand, the active current which is sent out on the other hand hardly increases the energy consumption of the system, the equivalent source impedance of the connection part of the tested device is not influenced by the energy feedback part on the direct current side,
the energy storage unit is formed by connecting two energy storage capacitors in series. The energy storage unit realizes energy storage, exchange and stabilization of direct current bus voltage and is used for direct current side power supplies of all inverters.
The adjustable reactance is used for adjusting the output impedance of the sinusoidal voltage inversion unit, so that the harmonic suppression or the filtering effect can be conveniently tested.
The controller comprises a main controller, a four-quadrant rectification controller, a sinusoidal voltage inversion controller and a load current generation controller; the four-quadrant rectifying controller, the sinusoidal voltage inversion controller and the load current generation controller respectively control the four-quadrant rectifying unit, the sinusoidal voltage inversion unit and the load current generation unit correspondingly; the main controller is connected with other controllers by adopting a communication bus; the main controller is connected with the human-computer interface.
A control method for a detection device for dynamic response and harmonic suppression of a reactive power compensation device, comprising the steps of:
firstly, when the detection device is electrified, a resistor in the input buffer device is firstly connected in, and after the electrification is completed, the main controller controls a contactor in the input buffer device to be attracted;
step two, the main controller transmits the information obtained by the human-computer interface to each sub-controller through communication;
after receiving the starting command, the main controller firstly issues a command to control the four-quadrant rectification controller to work, the four-quadrant rectification controller controls the direct current bus voltage to a required size according to the voltage level of a test and corrects the power factor of a network side in real time, then the main controller issues the command to control the sinusoidal voltage inversion controller to start inversion, the sinusoidal voltage inversion controller controls the output of the inverter according to the target voltage and the frequency issued by the main controller in advance in communication, and after judging that the inversion output is normal, the main controller issues the command to control the load current generation controller to start inversion, and the load current generation controller controls the generation of step reactive, active or set harmonic current issued by the main controller in advance in communication;
and fourthly, after receiving the stop command, the main controller firstly issues a command to control the load current generation controller to stop inverting, then issues a command to control the sinusoidal voltage inversion controller to stop inverting, and then controls the four-quadrant rectification controller to stop working.
The beneficial effects of the invention are as follows:
1) The reactive, harmonic, active and other load currents generated by the invention can be realized by adopting a digital inversion mode through programming, the required step load can be generated, the harmonic frequency can be selected, the output size can be adjusted at will, and the invention is more convenient and flexible.
2) The invention adopts the energy feedback technology, basically does not consume energy when generating active current load, and is more energy-saving.
3) The invention does not need to additionally add a feedback inverter device to be connected to the power grid in parallel, and can reduce loss.
4) The invention does not change the equivalent source impedance of the junction of the equipment at the side during feedback, and does not influence the harmonic suppression effect test of reactive compensation.
5) The four-quadrant rectifier is adopted at the power input end of the invention, so that the correction of the power factor can be carried out, the harmonic wave and reactive current are eliminated from flowing into the power grid, and the source power factor of the test platform is improved;
6) The test power supply is derived from a sinusoidal output voltage type inverter power supply, has small voltage harmonic wave, and solves the problem that the background voltage harmonic wave of the original power supply power grid has an influence on reactive compensation harmonic wave inhibition effect test.
7) The test power supply is derived from a sinusoidal output voltage type inverter power supply, the source impedance is preset, and the harmonic suppression effect test of reactive compensation cannot be affected by uncertainty of the source impedance.
8) The test power supply is derived from a sinusoidal output voltage type inverter power supply, the voltage of the output end is constant, the three phases are balanced, and the dynamic response time test of reactive compensation is not affected.
9) The test power supply is derived from a sinusoidal output voltage type inverter power supply, the direct current side and the alternating current side of the inverter can be adjusted, when the power supply voltage required by the reactive compensation device is inconsistent with the power supply voltage, the system can be restarted for testing after the parameter setting is changed, and the system is not required to be built again.
10 The test power supply is derived from a sinusoidal output voltage type inverter power supply, and when the power frequency required by the reactive compensation device is inconsistent with the power grid, the test can be performed after the inverter power supply frequency is changed.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
the power supply comprises a QF1 input circuit breaker, a KM_R1 input buffer device, a M1 four-quadrant rectifying unit, a M2 sinusoidal voltage inversion unit, a M3 load current generation unit, a M4. energy storage unit, a L1 adjustable reactor, a L2 input reactor, a L3 first output reactor, a L4 second output reactor, an IGBT, a semiconductor electronic switch, C1 and C2 capacitors, C3. filter capacitors, a QF2 output circuit breaker, a CT1 first current transformer, a CT2 second current transformer, a CT3 third current transformer and a CT4 fourth current transformer.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The structures, proportions, sizes, etc. shown in the drawings attached hereto are for illustration purposes only and are not intended to limit the scope of the invention, which is defined by the claims, but rather by the claims. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
As shown in fig. 1, a detection device for dynamic response and harmonic suppression of a reactive compensation device includes: the four-quadrant rectifying unit M1, the sinusoidal voltage inversion unit M2, the load current generation unit M3, the energy storage unit M4, the adjustable reactance L1, the input breaker QF1, the input buffer KM_R1, the output breaker QF2, the first current transformer CT1, the second current transformer CT2, the third current transformer CT3 and the controller.
The power grid voltage is connected in series to an input buffer device KM_R1 after passing through an input breaker QF1, the output end of the input buffer device KM_R1 is connected with the input end of the alternating current side of the four-quadrant rectifying unit M1, and a fourth current transformer is arranged on the connection circuit of the input buffer device KM_R1 and the input buffer device KM_R1; the four-quadrant rectifying unit M1, the sinusoidal voltage inversion unit M2 and the direct current buses DC+ and DC-of the load current generation unit M3 are respectively connected in parallel and then connected to two ends of the energy storage unit M4; the adjustable reactance L1 is connected in series with the output end of the sinusoidal voltage inversion unit M2; the sinusoidal voltage inversion unit M2 is connected with the adjustable reactance L1 in series and then is connected with the output end of the load current generation unit M3; the sinusoidal voltage inversion unit M2 is connected with the adjustable reactance L1 in series and then is connected to the output breaker QF2, and the output end of the QF2 is connected with the main loop of the reactive compensation device to be tested; the circuit between the adjustable reactance L1 and the input end of the output breaker QF2 is connected with a first current transformer CT1 and a third current transformer CT3 in series, the output end of the load current generation unit M3 is connected with a second current transformer CT2, and the second current transformer CT2 is connected between the first current transformer CT1 and the third current transformer CT 3; the midpoint of the capacitor of the energy storage unit M4 is connected with a neutral point N of the power grid;
the input buffer device KM_R1 comprises an alternating current contactor and buffer resistors connected in parallel at two ends of the alternating current contactor, and is used for power-on buffering of the detection device, the resistors are connected during power-on, and the contactor is attracted after the power-on is completed;
the first, second and third current transformers CT1, CT2 and CT3 are respectively secondary signals of the compensated current, the load current and the compensation current, and are used for detecting dynamic response or harmonic suppression effect of the reactive power compensation device, and the fourth current transformer CT4 is used for detecting a four-quadrant rectification controller.
The four-quadrant rectifying unit M1 is composed of an input reactor L2 and semiconductor electronic switches IGBT, wherein the input end of the input reactor is connected with the output end of the input buffer device, and the output end of the input reactor is connected between the two semiconductor electronic switches connected in series. The four-quadrant rectification and the regulation control of the direct current bus voltage are realized, the pumping of the direct current bus voltage can be realized, and the power factor correction function of the test platform on the power grid side can also be realized.
The sinusoidal voltage inversion unit M2 is composed of semiconductor electronic switch IGBT, a first output reactor L3 and a filter capacitor C3, the middle of the two semiconductor electronic switch IGBT in series connection is connected with the input end of the first output reactor L3, and the output end L3 of the first output reactor is respectively connected with the filter capacitor C3 and the adjustable reactor L1. The inversion of the voltage is realized by adopting a PWM inversion mode, and the power supply aims of sinusoidal output of the waveform, small harmonic wave, stable voltage and flexible voltage and frequency adjustment are fulfilled.
The load current generating unit M3 is composed of a semiconductor electronic switch IGBT and a second output reactor L4, the middle of the two semiconductor electronic switches IGBT connected in series is connected with the input end of the second output reactor L4, and the output end of the second output reactor L4 is connected with a third current transformer CT3. Generating reactive current, harmonic current and active current required by test by adopting a PWM inversion mode, and programming impact load required by dynamic response of reactive compensation and generating harmonic current of required harmonic frequency; the direct current bus of the load current generating unit is connected with the direct current bus of the four-quadrant rectifying unit and the direct current bus of the sinusoidal voltage inversion unit to form an energy feedback channel, so that the load current generating unit saves an inversion part fed back to an alternating current side on one hand, active current emitted on the other hand hardly increases system energy consumption, and the equivalent source impedance of the connection part of the tested device is not influenced by the energy feedback part on the direct current side.
The energy storage unit M4 is formed by connecting capacitors C1 and C2 in series, the capacitors can adopt electrolytic capacitors or film capacitors, and can realize energy storage and exchange and stabilization of direct current bus voltage, and the energy storage unit M is used for a direct current side power supply of each inverter.
The adjustable reactance L1 is used for adjusting the output impedance of the sinusoidal voltage inversion unit, so that the harmonic suppression or the filtering effect test is facilitated.
The controller comprises a main controller, a four-quadrant rectification controller, a sinusoidal voltage inversion controller and a load current generation controller; the four-quadrant rectifying controller, the sinusoidal voltage inversion controller and the load current generation controller respectively control the four-quadrant rectifying unit, the sinusoidal voltage inversion unit and the load current generation unit correspondingly; the main controller is connected with other controllers by adopting a communication bus; the main controller is connected with the human-computer interface.
A control method for a detection device for dynamic response and harmonic suppression of a reactive power compensation device, comprising the steps of:
firstly, when the detection device is electrified, the resistor in the input buffer device is firstly connected in, and after the electrification is completed, the main controller controls the contactor in the input buffer device to be attracted;
step two, the main controller transmits the information obtained by the human-computer interface to each sub-controller through communication;
after receiving the starting command, the main controller firstly issues a command to control the four-quadrant rectification controller to work, the four-quadrant rectification controller controls the direct current bus voltage to a required size according to the voltage level of a test and corrects the power factor of a network side in real time, then the main controller issues the command to control the sinusoidal voltage inversion controller to start inversion, the sinusoidal voltage inversion controller controls the output of the inverter according to the target voltage and the frequency issued by the main controller in advance in communication, and after judging that the inversion output is normal, the main controller issues the command to control the load current generation controller to start inversion, and the load current generation controller controls the generation of step reactive, active or set harmonic current issued by the main controller in advance in communication;
and fourthly, after receiving the stop command, the main controller firstly issues a command to control the load current generation controller to stop inverting, then issues a command to control the sinusoidal voltage inversion controller to stop inverting, and then controls the four-quadrant rectification controller to stop working.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (7)
1. The detection device for dynamic response and harmonic suppression of the reactive power compensation device is characterized in that the power grid voltage is connected in series to an input buffer device after being input into a circuit breaker, the output end of the input buffer device is connected with the input end of the alternating current side of the four-quadrant rectifying unit, and a fourth current transformer is arranged on the connection circuit of the input buffer device and the input end of the four-quadrant rectifying unit; the four-quadrant rectifying unit, the sinusoidal voltage inversion unit and the direct current buses of the load current generation unit are respectively connected in parallel and then connected to two ends of the energy storage unit; the output end of the sinusoidal voltage inversion unit is connected with an adjustable reactor in series and then is respectively connected with the output end of the load current generation unit and the input end of the output breaker; the circuit between the adjustable reactance and the input end of the output circuit breaker is connected with a first current transformer and a third current transformer in series, the output end of the load current generating unit is connected with a second current transformer, and the second current transformer is connected between the first current transformer and the third current transformer; the output end of the output circuit breaker is connected with the main loop of the reactive compensation device to be tested; the midpoint of the capacitor of the energy storage unit is connected with the neutral point of the power grid; the action execution of each unit is controlled by a corresponding controller;
the input buffer device comprises an alternating current contactor and buffer resistors connected in parallel to two ends of the alternating current contactor, and is used for power-on buffering of the detection device, the resistors are connected during power-on, and the contactor is attracted after the power-on is completed;
the first, second and third current transformers are respectively transformer secondary signals of the compensated current, the load current and the compensation current, and are used for dynamic response or harmonic suppression effect detection of the reactive power compensation device.
2. The detecting device for dynamic response and harmonic suppression of a reactive power compensation device according to claim 1, wherein the four-quadrant rectifying unit is composed of an input reactor and a semiconductor electronic switch, an input end of the input reactor is connected with an output end of the input buffer device, and an output end of the input reactor is connected between the two semiconductor electronic switches connected in series.
3. The detecting device for dynamic response and harmonic suppression of a reactive power compensation device according to claim 1, wherein the sinusoidal voltage inverting unit is constituted by a semiconductor electronic switch, a first output reactor, and a filter capacitor; the middle of the two serially connected semiconductor electronic switches is connected with the input end of the first output reactor, and the output end of the first output reactor is respectively connected with the filter capacitor and the adjustable reactor.
4. The detecting device for dynamic response and harmonic suppression of a reactive power compensation device according to claim 1, wherein the load current generating unit is constituted by a semiconductor electronic switch and a second output reactor; the middle of the two serially connected semiconductor electronic switches is connected with the input end of the second output reactor, and the output end of the second output reactor is connected with the third current transformer.
5. The detection device for dynamic response and harmonic suppression of reactive power compensation devices according to claim 1, wherein the energy storage unit is composed of two energy storage capacitors connected in series.
6. The detection apparatus for dynamic response and harmonic suppression of a reactive power compensation apparatus according to claim 1, wherein the controller includes a main controller, a four-quadrant rectification controller, a sinusoidal voltage inversion controller, and a load current generation controller; the four-quadrant rectifying controller, the sinusoidal voltage inversion controller and the load current generation controller respectively control the four-quadrant rectifying unit, the sinusoidal voltage inversion unit and the load current generation unit correspondingly; the main controller is connected with other controllers by adopting a communication bus; the main controller is connected with the human-computer interface.
7. A control method of a detection device for dynamic response and harmonic suppression of reactive power compensation devices according to any one of claims 1-6, characterized by the steps of:
firstly, when the detection device is electrified, a resistor in the input buffer device is firstly connected in, and after the electrification is completed, the main controller controls a contactor in the input buffer device to be attracted;
step two, the main controller transmits the information obtained by the human-computer interface to each sub-controller through communication;
after receiving the starting command, the main controller firstly issues a command to control the four-quadrant rectification controller to work, the four-quadrant rectification controller controls the direct current bus voltage to a required size according to the voltage level of a test and corrects the power factor of a network side in real time, then the main controller issues the command to control the sinusoidal voltage inversion controller to start inversion, the sinusoidal voltage inversion controller controls the output of the inverter according to the target voltage and the frequency issued by the main controller in advance in communication, and after judging that the inversion output is normal, the main controller issues the command to control the load current generation controller to start inversion, and the load current generation controller controls the generation of step reactive, active or set harmonic current issued by the main controller in advance in communication;
and fourthly, after receiving the stop command, the main controller firstly issues a command to control the load current generation controller to stop inverting, then issues a command to control the sinusoidal voltage inversion controller to stop inverting, and then controls the four-quadrant rectification controller to stop working.
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