CN106443268A - Low-voltage ride-through capability detection device and method of low-voltage auxiliary engine frequency converter of thermal power plant - Google Patents
Low-voltage ride-through capability detection device and method of low-voltage auxiliary engine frequency converter of thermal power plant Download PDFInfo
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Abstract
The invention discloses a low-voltage ride-through capability detection device of a low-voltage auxiliary engine frequency converter of a thermal power plant. The device comprises a three-phase input power supply, a detected device, a voltage sag generation device and a load, the three-phase input power supply is electrically connected with the voltage sag generation device, the voltage sag generation device is electrically connected with the detected device, and the detected device is electrically connected with the load; the detected device is the low-voltage auxiliary engine frequency converter or a low-voltage modified auxiliary engine frequency converter system; the voltage sag generation device comprises two three-phase voltage type PWM (pulse-width modulation) converters which are connected in a back-to-back manner, and is used for generating voltage sag including balanced voltage sag and unbalanced voltage sag, and the load is an artificial load or actual load. By the low-voltage ride-through capability detection device, low-voltage ride-through capability of the low-voltage auxiliary engine frequency converter of the thermal power plant can be measured effectively and accurately.
Description
Technical field
The present invention relates to thermal power plant's low pressure subsidiary engine technical field, particularly relate to the low electricity of a kind of thermal power plant low pressure subsidiary engine frequency converter
Pressure ride-through capability detection equipment and method.
Background technology
Frequency converter, because it is in control and the irreplaceable advantage of energy-conservation aspect, is widely used in every profession and trade.But
Owing to line voltage is unstable, frequency converter is caused in use to create new problem：Frequency converter high-low pressure trip protection（I.e. low
Voltage ride-through）.Most frequency converter high-low voltage ride-through capability differences, some even do not possess this ability.In recent years, whole nation thermoelectricity
Factory there occurs the event that a lot of system transient fault causes fired power generating unit to shut down successively, causes system to shake or off-the-line, on a large scale
Power failure load sheddings etc., cause great social and economic effect.
Therefore, carry out transforming just being particularly important to the low pressure subsidiary engine frequency converter without low voltage ride-through capability, also
Become the important method improving thermal power plant's low pressure subsidiary engine frequency converter operational reliability.Many thermal power plants have started to for fired power generating unit
The problem that low pressure subsidiary engine frequency converter does not possess low voltage ride-through capability is transformed, but does not has correlation test method and test
Equipment verifies whether improved system low-voltage ride-through capability meets the height of related request or low voltage ride-through capability.
Content of the invention
The technical problem to be solved is to provide a kind of thermal power plant low pressure auxiliary for above-mentioned the deficiencies in the prior art
Machine frequency converter low voltage ride-through capability detection equipment and method, the low pressure subsidiary engine frequency converter low voltage ride-through capability detection of this thermal power plant
Equipment and method can the low voltage ride-through capability of effective Accurate Determining thermal power plant low pressure subsidiary engine frequency converter, be that thermal power plant carries further
High frequency converter low voltage ride-through capability provides data to support.
For realizing above-mentioned technical purpose, the technical scheme that the present invention takes is：
Thermal power plant's low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, including three-phase input power, equipment under test, voltage
Fall generating means and load temporarily, described three-phase input power electrically connects with voltage dip generating means, and described voltage dip occurs
Device electrically connects with equipment under test, and described equipment under test electrically connects with load；
Described equipment under test is low pressure subsidiary engine frequency converter or low pressure transformation subsidiary engine frequency convertor system；
Described voltage dip generating means includes two the three-phase voltage type PWM conversion consisting of the connected mode of " back-to-back "
Device, described voltage dip generating means is used for producing voltage dip, and described voltage dip includes that balanced voltage drops and uneven temporarily
Voltage dip,
Described load is fictitious load or actual loading.
As further improved technical scheme of the present invention, described three-phase input power is sent out with voltage dip by switching Q1
Generating apparatus electrically connects, and described voltage dip generating means is electrically connected with equipment under test by switching Q2, and described equipment under test passes through
Switch Q3 electrically connects with load.
As further improved technical scheme of the present invention, described fictitious load is the energy being made up of motor and generator
Amount feed-back type motor load, described equipment under test is electrically connected with the motor in energy feedback type motor load by switching Q3
Connecing, described motor electrically connects with generator, and described generator electrically connects with three-phase input power.
As further improved technical scheme of the present invention, described fictitious load is constituted for being taken turns by motor and damping rotary
Energy consumption formula motor load, described equipment under test by switch Q3 electrically connect with the motor in energy consumption formula motor load,
Described motor electrically connects with damping rotary wheel.
As further improved technical scheme of the present invention, described fictitious load is for by two being connected by " back-to-back "
What three-phase voltage type pwm converter was constituted power electronics fictitious load, described equipment under test is by switch Q3 and power electronics
Fictitious load electrically connects, and described power electronics fictitious load electrically connects with three-phase input power.
As further improved technical scheme of the present invention, described actual loading is feeder.
As further improved technical scheme of the present invention, described low pressure transformation subsidiary engine frequency convertor system is for being electrically connected to each other
Low pressure subsidiary engine frequency converter and low voltage ride through device.
As further improved technical scheme of the present invention, the voltage including three-phase symmetrical short circuit drops in described balanced voltage temporarily
Fall temporarily, voltage dip, the voltage dip of two-phase phase fault and the list including two-phase grounding fault drops in described unbalance voltage temporarily
The voltage dip of phase ground short circuit.
For realizing above-mentioned technical purpose, another technical scheme that the present invention takes is：
The method of a kind of thermal power plant low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, comprises the following steps：
（1）Confirm that switch Q1, switch Q2 and switch Q3 are in off-state；
（2）Close a switch Q1, checks the duty of voltage dip generating means, by the output voltage of voltage dip generating means
It is set to 380V；
（3）Close a switch Q2 and switch Q3, starts equipment under test and load；
（4）Voltage dip generating means carries out low voltage test successively according to voltage dip characteristic quantity, often between test twice
Time interval does not limits, the waveform of input ac voltage of equipment under test, output AC voltage when using oscillograph to gather low-voltage
Waveform, the waveform of input ac voltage of control circuit of the waveform of DC bus-bar voltage of equipment under test and equipment under test；
（5）Send halt instruction to equipment under test, observe whether equipment under test normally stops output；
（6）If equipment under test is low pressure subsidiary engine frequency converter, step（7）；If equipment under test is low pressure, transformation subsidiary engine becomes
Frequently device system, then make low voltage ride through device send fault-signal, observes whether low pressure subsidiary engine frequency converter normally stops output；
（7）If step（4）The all non-unusual fluctuations of all waveforms that middle oscillograph gathers, equipment under test normally works, and step
（5）And step（6）In equipment under test normally export, then draw equipment under test meet low voltage ride-through capability technical specification want
Ask, otherwise, then show that equipment under test does not meets the requirement of low voltage ride-through capability technical specification.
As further improved technical scheme of the present invention, further comprising the steps of：Defeated by voltage dip generating means
The type that is out of order is set to three-phase symmetrical short circuit, two-phase grounding fault, two-phase phase fault and single-line to ground fault respectively successively, inspection
Survey whether equipment under test sends under-voltage fault-signal, the low voltage ride-through capability of detection equipment under test, draw the low of equipment under test
Voltage ride through ability curve, draws the height of the low voltage ride-through capability of equipment under test according to low voltage ride-through capability curve.
Whether the present invention effectively can meet low voltage ride-through capability technology rule by Accurate Determining thermal power plant low pressure subsidiary engine frequency converter
The requirement of model, is drawn the height of the low voltage ride-through capability of equipment under test accurately by low voltage ride-through capability curve, for fire
Power plant improves frequency converter low voltage ride-through capability further provides data to support；Equipment under test is low pressure subsidiary engine frequency converter or low pressure
Transformation subsidiary engine frequency convertor system, therefore transforms subsidiary engine frequency convertor system for low pressure subsidiary engine frequency converter or low pressure, all can measure
Its low voltage ride-through capability；Load is fictitious load or actual loading, and fictitious load can realize that load torque changes and simulated fire
Power plant electrical characteristic；Voltage dip generating means includes two three-phase voltage types consisting of the connected mode of " back-to-back "
Pwm converter, voltage dip generating means belongs to power electronics formula, can produce balanced voltage and drop temporary with unbalance voltage temporarily
Fall, the low voltage ride-through capability for detection equipment under test provides the foundation.
Brief description
Fig. 1 is the circuit topology figure of voltage dip generating means, it is also possible to the circuit as power electronics fictitious load is opened up
Flutter figure.
When Fig. 2 is low voltage ride-through capability test, the wiring diagram of preparatory stage, is also to the low pressure subsidiary engine frequency conversion do not transformed
Device carries out circuit interconnect pattern during low voltage ride-through capability test.
Fig. 3 is low voltage ride through device in parallel and low voltage ride through device detects without low voltage ride-through capability during external energy storage
Circuit interconnect pattern.
Fig. 4 is series connection low voltage ride through device and low voltage ride through device low voltage ride-through capability detection when having external energy storage
Circuit interconnect pattern.
Fig. 5 is the circuit interconnect pattern as low voltage ride-through capability detection during transformation device for the series connection UPS/DVR.
Fig. 6 is the circuit interconnect pattern of Energy in use formula motor load.
Fig. 7 is the circuit interconnect pattern using energy feedback type motor load.
Fig. 8 is the circuit interconnect pattern using energy feedback type power electronics fictitious load.
Fig. 9 is the low voltage ride-through capability curve drawn out in test mode two.
Detailed description of the invention
Further illustrate below according to the detailed description of the invention to the present invention for the Fig. 1 to Fig. 9：
Thermal power plant's low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, including three-phase input power, equipment under test, voltage
Fall generating means and load temporarily, described three-phase input power electrically connects with voltage dip generating means, and described voltage dip occurs
Device electrically connects with equipment under test, and described equipment under test electrically connects with load；
Equipment under test can for i.e. itself have without transformation low voltage ride-through capability low pressure subsidiary engine frequency converter or
Transform subsidiary engine frequency convertor system through the improved low pressure of low voltage crossing.Low pressure transformation subsidiary engine frequency convertor system mainly has as follows
Several：（1）As it is shown on figure 3, low voltage ride through device in parallel, the boosting in low voltage ride through device on low pressure subsidiary engine frequency converter
The residual voltage of three-phase input power is boosted to 380V by circuit, inputs low pressure subsidiary engine frequency converter.（2）As shown in Figure 4, at low pressure subsidiary engine
Series connection low voltage ride through device on frequency converter, and external energy storage, external energy storage can be battery, it is also possible to be that station-service 220V is straight
Mobilization force power supply, when dropping temporarily occurs in the voltage of three-phase input power output, the booster circuit in low voltage ride through device is by external
The output voltage of energy storage boosts to 380V input low pressure subsidiary engine frequency converter.（3）As it is shown in figure 5, at low pressure subsidiary engine frequency converter and electricity
Series connection UPS/DVR between pressure fall generating means temporarily, it is ensured that the voltage value of input low pressure subsidiary engine frequency converter is maintained at rated value.
Described voltage dip generating means includes two the three-phase voltage type PWM consisting of the connected mode of " back-to-back "
Converter, described voltage dip generating means is used for producing voltage dip, and described voltage dip includes that balanced voltage drops and not temporarily
Balanced voltage drops temporarily, and voltage dip generating means, as it is shown in figure 1, input filter inductance 1 is used for storing energy, filters harmonic high frequency
Ripple, reduces high frequency electric ripple etc.；The three-phase alternating voltage of input is changed into DC voltage by three-phase controlled rectification 2, on the one hand
The voltage at dc bus can be improved, for realizing that the detection of high voltage crossing ability is prepared, on the other hand controllable input side electricity
Stream and arc in phase, it is to avoid electrical network is caused Harmfulness Caused by Harmonics by this test；Dc bus filtering link 3 is used for storing energy, it is ensured that
Power-balance between rectifier and inverter, stable DC busbar voltage；Three-phase voltage type PWM inverter 4 input fault electricity
Pressure type, residual voltage value, false voltage duration, it is possible at the corresponding SPWM waveform of the various generation of control system, thus control
Switching tube processed, produces given category and the voltage dip of time, i.e. produce include that balanced voltage drops temporarily, unbalance voltage drops temporarily,
Voltage interruption etc., at interior voltage failure, provide test power supply for low voltage crossing test；5 is alternating current filter, filters three-phase
The high-frequency harmonic that Voltage Source PWM Inverter 4 produces.
Described load is fictitious load or actual loading, and fictitious load can realize that load torque changes and simulated fire power plant
Electrical characteristic, the present invention proposes three kinds of feasible programs：One is by motor and to drag the energy consumption formula electricity that damping rotary wheel is constituted
Motivation loads, and equipment is simple, it is easy to operation；Two is that the generator of motor and dragging thereof constitutes energy feedback type motor and bears
Carrying, generator institute generated energy is incorporated to three-phase input power, and regulation generated energy i.e. can adjust low pressure subsidiary engine transducer power；Three is logical
Crossing what two three-phase voltage type pwm converters that " back-to-back " connect were constituted power electronics fictitious load, topology is also such as Fig. 1 institute
Show, by three-phase controlled rectification 2 by the ac output voltage rectification of low pressure subsidiary engine frequency converter and for DC voltage higher than 540V,
And control input voltage and become designated phase relation with electric current, for simulating the load under various power factor；Three-phase voltage type PWM
The three-phase alternating current that inverter 4 is is frequently homophase same with line voltage by DC inverter, the wattful power that fictitious load is absorbed
Rate feeds back to three-phase input power, and the effect of other parts is identical with voltage dip device.Actual loading by subsidiary engine, conveyer belt and
Corresponding working medium composition, the actual loading in the present embodiment is feeder.
Further, as it is shown in figure 1, described three-phase input power is electrically connected with voltage dip generating means by switching Q1
Connecing, described voltage dip generating means is electrically connected with equipment under test by switching Q2, and described equipment under test is by switch Q3 and bears
Carry electrical connection.
Further, described fictitious load is the energy feedback type motor being made up of the generator of motor and dragging thereof
Load, as it is shown in fig. 7, described equipment under test is electrically connected with the motor in energy feedback type motor load by switching Q3,
Described motor electrically connects with generator, and described generator electrically connects with three-phase input power.
Further, described fictitious load is for being taken turns, by the damping rotary of motor and dragging thereof, the energy consumption formula motor constituting
Load, as shown in Figure 6, described equipment under test is electrically connected with the motor in energy consumption formula motor load by switching Q3, described
Motor electrically connects with damping rotary wheel.
Further, described fictitious load is for by two the three-phase voltage type pwm converter structures being connected by " back-to-back "
Become power electronics fictitious load, as shown in Figure 8, described equipment under test by switch Q3 be electrically connected with power electronics fictitious load
Connecing, described power electronics fictitious load electrically connects with three-phase input power.
Further, as shown in Figures 2 to 5, described actual loading is feeder.
Further, described low pressure transformation subsidiary engine frequency convertor system is improved low pressure subsidiary engine frequency converter, is mutually
The low pressure subsidiary engine frequency converter of electrical connection and low voltage ride through device.
Further, the voltage dip including three-phase symmetrical short circuit drops in described balanced voltage temporarily, and described unbalance voltage is temporary
Fall includes the voltage dip of voltage dip, the voltage dip of two-phase phase fault and the single-line to ground fault of two-phase grounding fault.
The method of a kind of thermal power plant low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, comprises the following steps：
First, the preparatory stage：
A () connects all testing equipments according to Fig. 2, confirm that switch Q1, switch Q2 and switch Q3 are in off-state；
（b）Close a switch Q1, checks the duty of voltage dip generating means, by the output voltage of voltage dip generating means
It is set to 380V；
（c）Close a switch Q2 and switch Q3, starts equipment under test and load, checks whether equipment under test and load be properly functioning；
If d () is working properly, disconnect switch Q1, switch Q2 and switch Q3.If exception or fault occur, check failure cause and disappear
Except fault.
2nd, experimental stage：
Test mode one, it is determined that the low voltage ride-through capability of a certain low pressure subsidiary engine frequency converter or improved low pressure subsidiary engine frequency converter
Whether meet the requirement of low voltage ride-through capability technical specification：
（1）According to equipment under test whether through transformation and the three kinds of modes transformed thereof, select a certain wiring side in Fig. 2 ~ Fig. 8
Formula connects all testing equipments, confirms that switch Q1, switch Q2, switch Q3 and switch Q4 are in off-state.
Fig. 2 is applicable to the low pressure subsidiary engine frequency converter i.e. itself with low voltage ride-through capability without transformation, and three-phase inputs
Power supply is electrically connected with voltage dip generating means by switching Q1, and described voltage dip generating means is auxiliary with low pressure by switch Q2
Machine frequency converter electrically connects, and described low pressure subsidiary engine frequency converter is electrically connected with feeder by switching Q3, and feeder controls ring current
Electrically connect with the control system of low pressure subsidiary engine frequency converter, provide electric energy for the control system with low pressure subsidiary engine frequency converter.
It is low voltage ride through device in parallel and not external energy storage on low pressure subsidiary engine frequency converter that Fig. 3 is applicable to reforming mode,
Three-phase input power is electrically connected with voltage dip generating means by switching Q1, and described voltage dip generating means is by switch Q2
Electrically connecting with low pressure subsidiary engine frequency converter and low voltage ride through device respectively, low voltage ride through device is auxiliary with low pressure by switch MCB
Machine frequency converter electrically connects, and low pressure subsidiary engine frequency converter is electrically connected with feeder by switching Q3, uninterrupted power source UPS and feeder control
Ring current processed electrically connects, and feeder control ring current electrically connects with the control system of low pressure subsidiary engine frequency converter, is and low pressure
The control system of subsidiary engine frequency converter provides electric energy.
It is connect on low pressure subsidiary engine frequency converter low voltage ride through device, and external external electrical that Fig. 4 is applicable to reforming mode
Source, three-phase input power is electrically connected with voltage dip generating means by switching Q1, and described voltage dip generating means is by opening
Closing Q2 to electrically connect with low pressure subsidiary engine frequency converter, external power source electrically connects with low voltage ride through device with by switching MCB1, low electricity
Pressure traversing device is electrically connected with low pressure subsidiary engine frequency converter by switching MCB2, and low pressure subsidiary engine frequency converter is by switch Q3 and feeder
Electrical connection, uninterrupted power source UPS electrically connects with feeder control ring current, and feeder control ring current becomes with low pressure subsidiary engine
Frequently the control system electrical connection of device, provides electric energy for the control system with low pressure subsidiary engine frequency converter.
It is the UPS/DVR that connects between low pressure subsidiary engine frequency converter and voltage dip generating means that Fig. 5 is applicable to modification scheme,
Three-phase input power is electrically connected with voltage dip generating means by switching Q1, and described voltage dip generating means is by switch Q2
Electrically connecting with UPS/DVR, UPS/DVR is electrically connected with low pressure subsidiary engine frequency converter by switching Q3, and low pressure subsidiary engine frequency converter is by opening
Closing Q4 to electrically connect with feeder, uninterrupted power source UPS electrically connects with feeder control ring current, and feeder controls ring current
Electrically connect with the control system of low pressure subsidiary engine frequency converter, provide electric energy for the control system with low pressure subsidiary engine frequency converter.
Fig. 2 ~ Fig. 5 all uses the feeder of reality as load, it is possible to use fictitious load carries out laboratory test, with
As a example by reforming mode is for low voltage ride through device in parallel on low pressure subsidiary engine frequency converter and not external energy storage, Fig. 6 is Energy in use
Wiring diagram during formula motor load, described low pressure subsidiary engine frequency converter is by electronic with energy consumption formula motor load of switch Q3
Mechatronics, described motor electrically connects with damping rotary wheel.Wiring when Fig. 7 is to use energy feedback type motor load
Figure, described low pressure subsidiary engine frequency converter is electrically connected with the motor in energy feedback type motor load by switching Q3, described electricity
Motivation electrically connects with generator, and described generator electrically connects with three-phase input power.Fig. 8 is to use energy feedback type power electronics
Wiring diagram during fictitious load, its mesolow subsidiary engine frequency converter is electrically connected with power electronics fictitious load by switching Q3, described
Power electronics fictitious load is electrically connected with three-phase input power by switching Q4, the active power that power electronics fictitious load absorbs
Feed back to three-phase input power.
（2）Close a switch Q1, and the output voltage of voltage dip generating means is set to 380V；
（3）Close all of switch, starts equipment under test and load；
（4）Select《Large turbine-generator set one class subsidiary engine frequency converter high-low voltage crossing technology specification》As standard, then electricity
Pressure temporarily fall generating means carries out low voltage test successively according to the voltage dip characteristic quantity in table 1, often between test twice when
Between be spaced and do not limit, the waveform of the input ac voltage of equipment under test when using oscillograph to gather low-voltage, output AC voltage
Waveform, the waveform of DC bus-bar voltage of equipment under test, the waveform of input ac voltage of control circuit of equipment under test and phase
Close data；
The 1st, table is tested required voltage and is dropped characteristic quantity temporarily
| Sequence number | Fault type | Residual voltage | Duration |
| 1 | Three-phase symmetrical short circuit | 90%UN | 10s |
| 2 | Two-phase grounding fault | 90%UN | 10s |
| 3 | Two-phase phase fault | 90%UN | 10s |
| 4 | Single-line to ground fault | 90%UN | 10s |
| 5 | Three-phase symmetrical short circuit | 60%UN | 5s |
| 6 | Two-phase grounding fault | 60%UN | 5s |
| 7 | Two-phase phase fault | 60%UN | 5s |
| 8 | Single-line to ground fault | 60%UN | 5s |
| 9 | Three-phase symmetrical short circuit | 20%UN | 0.5s |
| 10 | Two-phase grounding fault | 20%UN | 0.5s |
| 11 | Two-phase phase fault | 20%UN | 0.5s |
| 12 | Single-line to ground fault | 20%UN | 0.5s |
The wherein selection reference of residual voltage and duration《Large turbine-generator set one class subsidiary engine frequency converter high-low voltage passes through
Technical specification》.
（5）Send halt instruction to equipment under test, observe whether equipment under test normally stops output；
（6）If equipment under test is low pressure subsidiary engine frequency converter, step（7）；If equipment under test is low pressure, transformation subsidiary engine becomes
Frequently device system i.e. improved low pressure subsidiary engine frequency converter, then make low voltage ride through device send fault-signal, observe low pressure subsidiary engine
Whether frequency converter normally stops output；
（7）Provide test result, if step（4）All waveforms fluctuation all without exception that middle oscillograph gathers, equipment under test is just
Often work, and step（5）And step（6）In equipment under test all can normally export, then show that equipment under test meets low-voltage and wears
The more requirement of enabling technology specification, i.e. the low voltage ride-through capability of equipment under test meets《Large turbine-generator set one class subsidiary engine
Frequency converter high-low voltage crossing technology specification》Require, be other situations else if, then show that equipment under test does not meets low electricity
The requirement of pressure ride-through capability technical specification.
Test mode two, in drafting 20s, the low-voltage of low pressure subsidiary engine frequency converter or improved low pressure subsidiary engine frequency converter is worn
More power curve：
（1）According to equipment under test whether through transformation and the three kinds of modes transformed thereof, select a certain wiring side in Fig. 2 ~ Fig. 8
Formula connects all testing equipments, confirms that switch Q1, switch Q2, switch Q3 and switch Q4 are in off-state.
（2）Close a switch Q1, and the output voltage of voltage dip generating means is set to 380V；
（3）Close all of switch, starts equipment under test and load；
（4）The output fault type of voltage dip generating means is set to respectively successively three-phase symmetrical short circuit, two-phase grounding fault,
Two-phase phase fault and single-line to ground fault, whether detection equipment under test sends under-voltage fault-signal, detects the low of equipment under test
Voltage ride through ability, draws the low voltage ride-through capability curve of equipment under test, draws tested according to low voltage ride-through capability curve
The height of the low voltage ride-through capability of equipment.
Step in test mode two（4）It is specially：
(a):Voltage dip generating means output fault type is set to three-phase symmetrical short circuit, and residual voltage isX k %UN（X k =10k,k=
0,1,2,3,4,5,6,7,8）, the duration is 20s.Start timing from this false voltage generation moment, until low pressure subsidiary engine becomes
Frequently device sends under-voltage fault-signal and terminates, and is designated as during this period of timet k .Record successively, untilk=8 ort k =20s.
(b)：Voltage dip generating means output fault type is set gradually as two-phase grounding fault, two-phase alternate respectively
Short circuit and single-line to ground fault, residual voltage isX k %UN, the duration ist k , carry out three tests respectively.If it is low in three tests
Pressure subsidiary engine frequency converter does not all send under-voltage fault-signal, then it is assumed that this equipment under test existsX k %UNLower low voltage ride-through capability is T k =t k .If at a time（<t k ）Frequency converter sends under-voltage fault-signal, then this equipment under test existsX k %UNLower low voltage crossing energy
Power T k =.
(c):Draw this low pressure subsidiary engine frequency converter or the low voltage ride-through capability of improved low pressure subsidiary engine frequency converter is bent
Line, typical case's drawing result is as it is shown in figure 9, size above curve then represents the height of this frequency converter low voltage ride-through capability
Low, the X-axis in Fig. 9 represents the time, and Y-axis represents residual voltage.
Whether the present invention effectively can meet low voltage ride-through capability technology rule by Accurate Determining thermal power plant low pressure subsidiary engine frequency converter
The requirement of model, is drawn the height of the low voltage ride-through capability of equipment under test accurately by low voltage ride-through capability curve, for fire
Power plant improves frequency converter low voltage ride-through capability further provides data to support；Equipment under test is low pressure subsidiary engine frequency converter or low pressure
Transformation subsidiary engine frequency convertor system, therefore transforms subsidiary engine frequency convertor system for low pressure subsidiary engine frequency converter or low pressure, all can measure
Its low voltage ride-through capability；Load is fictitious load or actual loading, and fictitious load can realize that load torque changes and simulated fire
Power plant electrical characteristic；Voltage dip generating means includes two three-phase voltage types consisting of the connected mode of " back-to-back "
Pwm converter, voltage dip generating means belongs to power electronics formula, can produce balanced voltage and drop temporary with unbalance voltage temporarily
Fall, the low voltage ride-through capability for detection equipment under test provides the foundation.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
It is as the criterion, replacement that any those skilled in the art making this technology is readily apparent that, deformation, improve and each fall within the present invention's
Protection domain.
Claims (10)
1. thermal power plant's low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, it is characterised in that：Including three-phase input power,
Equipment under test, voltage dip generating means and load, described three-phase input power electrically connects with voltage dip generating means, described
Voltage dip generating means electrically connects with equipment under test, and described equipment under test electrically connects with load；
Described equipment under test is low pressure subsidiary engine frequency converter or low pressure transformation subsidiary engine frequency convertor system；
Described voltage dip generating means includes two the three-phase voltage type PWM conversion consisting of the connected mode of " back-to-back "
Device, described voltage dip generating means is used for producing voltage dip, and described voltage dip includes that balanced voltage drops and uneven temporarily
Voltage dip；
Described load is fictitious load or actual loading.
2. thermal power plant according to claim 1 low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, its feature exists
In：Described three-phase input power is electrically connected with voltage dip generating means by switching Q1, and described voltage dip generating means leads to
Crossing switch Q2 to electrically connect with equipment under test, described equipment under test is electrically connected with load by switch Q3.
3. thermal power plant according to claim 2 low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, its feature exists
In：Described fictitious load is the energy feedback type motor load being made up of motor and generator, and described equipment under test passes through
Switch Q3 electrically connects with the motor in energy feedback type motor load, and described motor electrically connects with generator, described
Motor electrically connects with three-phase input power.
4. thermal power plant according to claim 2 low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, its feature exists
In：Described fictitious load is for being taken turns, by motor and damping rotary, the energy consumption formula motor load constituting, and described equipment under test passes through
Switch Q3 electrically connects with the motor in energy consumption formula motor load, and described motor electrically connects with damping rotary wheel.
5. thermal power plant according to claim 2 low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, its feature exists
In：Described fictitious load for be made up of two the three-phase voltage type pwm converters being connected by " back-to-back " power electronics
Fictitious load, described equipment under test is electrically connected with power electronics fictitious load by switching Q3, described power electronics fictitious load
Electrically connect with three-phase input power.
6. thermal power plant according to claim 1 low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, its feature exists
In：Described actual loading is feeder.
7. thermal power plant according to claim 2 low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, its feature exists
In：Described low pressure transformation subsidiary engine frequency convertor system is the low pressure subsidiary engine frequency converter and low voltage ride through device being electrically connected to each other.
8. thermal power plant according to claim 1 low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, its feature exists
In：The voltage dip including three-phase symmetrical short circuit drops in described balanced voltage temporarily, and described unbalance voltage drops temporarily and includes two phase ground
The voltage dip of the voltage dip of short circuit, the voltage dip of two-phase phase fault and single-line to ground fault.
9. a method for thermal power plant as claimed in claim 7 low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment,
It is characterized in that, comprise the following steps：
（1）Confirm that switch Q1, switch Q2 and switch Q3 are in off-state；
（2）Close a switch Q1, checks the duty of voltage dip generating means, by the output voltage of voltage dip generating means
It is set to 380V；
（3）Close a switch Q2 and switch Q3, starts equipment under test and load；
（4）Voltage dip generating means carries out low voltage test successively according to voltage dip characteristic quantity, often between test twice
Time interval does not limits, the waveform of input ac voltage of equipment under test, output AC voltage when using oscillograph to gather low-voltage
Waveform, the waveform of input ac voltage of control circuit of the waveform of DC bus-bar voltage of equipment under test and equipment under test；
（5）Send halt instruction to equipment under test, observe whether equipment under test normally stops output；
（6）If equipment under test is low pressure subsidiary engine frequency converter, step（7）；If equipment under test is low pressure, transformation subsidiary engine becomes
Frequently device system, then make low voltage ride through device send fault-signal, observes whether low pressure subsidiary engine frequency converter normally stops output；
（7）If step（4）The all non-unusual fluctuations of all waveforms that middle oscillograph gathers, equipment under test normally works, and step
（5）And step（6）In equipment under test normally export, then draw equipment under test meet low voltage ride-through capability technical specification want
Ask, otherwise, then show that equipment under test does not meets the requirement of low voltage ride-through capability technical specification.
10. the method for thermal power plant according to claim 9 low pressure subsidiary engine frequency converter low voltage ride-through capability detection equipment, its
It is characterised by, also include：The output fault type of voltage dip generating means is set to respectively successively three-phase symmetrical short circuit, two-phase
Ground short circuit, two-phase phase fault and single-line to ground fault, whether detection equipment under test sends under-voltage fault-signal, detects tested
The low voltage ride-through capability of equipment, draws the low voltage ride-through capability curve of equipment under test, according to low voltage ride-through capability curve
Draw the height of the low voltage ride-through capability of equipment under test.
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