CN217238228U - High voltage ride through testing arrangement based on dynamic reactive compensation principle - Google Patents
High voltage ride through testing arrangement based on dynamic reactive compensation principle Download PDFInfo
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- CN217238228U CN217238228U CN202123059303.5U CN202123059303U CN217238228U CN 217238228 U CN217238228 U CN 217238228U CN 202123059303 U CN202123059303 U CN 202123059303U CN 217238228 U CN217238228 U CN 217238228U
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Abstract
The utility model provides a high voltage ride through testing device based on the dynamic reactive compensation principle, which comprises a switch cabinet, a current-limiting reactor and a power electronic reactive compensation device SVG; the current-limiting reactor is connected with the incoming line bus through the switch cabinet; the power electronic reactive power compensation device SVG is connected with the outgoing bus through the switch cabinet; the device generates capacitive reactive current through the power electronic reactive power compensation device SVG, and the capacitive reactive current flows through the current-limiting reactor to form voltage drop and lifting test point voltage, so that high-voltage faults in a power grid are simulated, and high-voltage ride-through fault test is performed on the tested equipment. The utility model discloses use active controlled dynamic reactive power compensator to replace the condenser for the first time and produce the high voltage fault that passive reactance flows through in the reactive current simulation electric wire netting.
Description
Technical Field
The utility model relates to a new forms of energy field of being incorporated into the power networks, concretely relates to high voltage ride through testing arrangement based on dynamic reactive compensation principle.
Background
In recent decades, the new energy power generation industry has developed rapidly, the proportion of installed capacity of new energy including wind power and photovoltaic in a power grid is increased year by year, and the new energy becomes a non-negligible important power supply in a power system. Most of new energy machine sets are grid-connected machine sets, grid-connected port voltage is mainly determined by a power grid, the new energy machine sets control output current to realize power generation control, the stability of grid voltage amplitude and frequency is very important for stable operation of the machine sets, but grid structure of the power grid is very complex, grid-connected equipment is also various, and the risk and possibility of various faults in the power grid are increased day by day. Under the influence and promotion of standards, most new energy source units and power stations have low voltage ride through tolerance capability, when the power grid has an instantaneous short-circuit fault, the voltage drops instantaneously, and after the fault is cleared, the voltage is increased instead after the voltage of the power grid recovers due to the fact that a large number of reactive power compensation devices in the power grid are not timely withdrawn, namely, the high-voltage working condition is achieved; in addition, the direct-current extra-high voltage converter station locking failure can also cause a large amount of excessive reactive power on the line and also can cause a high-voltage working condition.
In recent years, several new energy grid disconnection accidents fully show that the grid voltage fault has great influence on the safe and stable operation of new energy source units and stations, for example, related new energy source units and stations do not have low-voltage ride-through and high-voltage ride-through capabilities, for example, a three-phase short circuit fault occurs in a wind farm in 2012, part of wind turbine generators with low-voltage ride-through capabilities successfully pass through at low voltage, and when the grid voltage is recovered, reactive compensation devices in a power station cannot be adjusted or cut off in time, so that local reactive power is excessive, and further, overvoltage faults occur at ports of the power station, so that a large number of units which successfully pass through at low voltage cannot pass through at high voltage, and the number of the units which are disconnected during the low-voltage fault even exceeds the number of the units which are disconnected during the low-voltage fault. Similar risks also exist for photovoltaic power plants, and therefore the high voltage ride through capability of new energy plants is of paramount importance.
The current mainstream high-voltage ride-through testing device can be divided into an active type and a passive type, the active type devices are mostly power electronic alternating-current power supplies, the amplitude and the frequency of output voltage can be changed through control, the device has various loop topologies and control strategies, different device performance differences are large, the problem of matching resonance is easy to occur when the device is combined with tested equipment for operation, the power grid fault characteristic simulated by the device during testing is large in difference with the actual working condition, and the consistency of the testing is difficult to ensure; the passive device mostly uses an inductance-capacitance resonance boosting principle, the scheme can truly simulate the characteristics of a power grid during the period of high voltage ride-through fault, the test consistency and reproducibility are good, but most devices need to design a plurality of inductance and capacitance parameters to realize a plurality of boosting gears, the loop is complex, the continuously adjustable boosting gears are difficult to realize, the output power characteristics of the tested device during the fault period have great influence on the test working condition, and the deviation of the actual boosting gears can reach +/-10%.
SUMMERY OF THE UTILITY MODEL
For solving the great not enough of prior art scheme structure complicacy, performance error, the utility model provides a high voltage ride through testing arrangement based on dynamic reactive compensation principle, the device includes: the system comprises a switch cabinet, a current-limiting reactor and a power electronic reactive power compensation device SVG;
the switch cabinet comprises an incoming line part and an outgoing line part, wherein the incoming line part is connected to a power grid through an incoming line bus, and the outgoing line part is connected to the tested equipment through an outgoing line bus;
the current limiting reactor is connected with the incoming line bus through the incoming line part; the SVG is connected with the outgoing bus through the outgoing part;
capacitive reactive current sent by the power electronic reactive power compensation device SVG flows through the current-limiting reactor to form voltage drop and lifting test point voltage, and high voltage faults in a power grid are simulated so as to carry out high voltage ride through fault test on tested equipment.
Preferably, the incoming line part comprises an incoming line switch cabinet, a first PT cabinet and a bypass switch cabinet;
the outgoing line part comprises a second switching cabinet, a current-feeding switch cabinet, a second PT cabinet and an outgoing line switch cabinet;
the incoming line bus is connected to a power grid through the incoming line switch cabinet, and the first switching cabinet, the first PT cabinet and the bypass switch cabinet are connected to the incoming line bus; the current limiting reactor is connected to the incoming line bus through the first switching cabinet and the bypass switch cabinet;
the outgoing line switch cabinet, the second transfer cabinet, the second PT cabinet and the current-feedback switch cabinet are connected to the outgoing line bus; and the power electronic reactive power compensation device SVG is connected to the outgoing bus through the current-feeding switch cabinet.
Further, the first PT cabinet and the second PT cabinet are respectively provided with a voltage transformer for measuring voltages of the grid access end and the tested device access end corresponding to the incoming bus and the outgoing bus respectively;
and current transformers are respectively configured on the incoming line switch cabinet, the bypass switch cabinet, the second switching cabinet, the current-feeding switch cabinet and the outgoing line switch cabinet and are used for measuring the currents of the power grid access end of the device, the access end of the tested equipment, the current-limiting reactor and the SVG.
Furthermore, the incoming switch cabinet, the bypass switch cabinet, the current-feed switch cabinet and the outgoing switch cabinet all adopt mechanical switches or power electronic valve group switches.
Further, the current-limiting reactor is any one of a dry-type air-core reactor, a dry-type iron-core reactor, a clamping-type dry-type air-core reactor, an oil-immersed air-core reactor and an oil-immersed iron-core reactor.
Furthermore, the power electronic reactive power compensation device SVG adopts a power electronic static var generator SVG.
Further, the voltage transformer adopts any one of an electromagnetic voltage transformer, a capacitor voltage transformer or a resistive divider; the current transformer adopts an electromagnetic current transformer or a Hall current sensor.
Furthermore, the incoming switch cabinet, the current-feed switch cabinet and the outgoing switch cabinet are provided with relay protection devices, and loop protection is started when unplanned abnormal overvoltage and overcurrent occur in the system.
Preferably, the current-limiting reactor with power electronics reactive power compensator SVG all installs temperature controller for monitoring temperature, and start the heat dissipation control when the temperature is greater than and sets for the threshold value.
Preferably, the switch cabinet is provided with a loop running state bitmap for displaying the on-off state of each switch in the device and bus voltage and current parameters in real time.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a high voltage ride through testing arrangement based on dynamic reactive compensation principle, the device includes: the system comprises a switch cabinet, a current-limiting reactor and a power electronic reactive power compensation device SVG; the switch cabinet comprises an incoming line part and an outgoing line part, wherein the incoming line part is connected to a power grid through an incoming line bus, and the outgoing line part is connected to the tested equipment through an outgoing line bus; the current limiting reactor is connected with the incoming line bus through the incoming line part; the power electronic reactive power compensation device SVG is connected with the outgoing bus through the outgoing part; capacitive reactive current emitted by the power electronic reactive power compensation device SVG flows through the current-limiting reactor to form voltage drop and rise test point voltage, and high-voltage faults in a power grid are simulated, so that high-voltage ride-through fault test is carried out on the tested equipment. The utility model discloses use active controlled dynamic reactive power compensator for the first time to replace the condenser to produce the high voltage fault that passive reactance flows through in the electric wire netting of reactive current simulation, with the mechanism that takes place high voltage fault in the actual electric wire netting unanimous completely, actual fault operating mode is pressed close to completely to voltage phase angle and electric energy quality characteristic during the high voltage fault.
The utility model provides a technical scheme only uses fixed parameter's current-limiting reactor and dynamic reactive current compensation arrangement can generate continuous voltage rising point and simulation symmetry and asymmetric fault operating mode, compares the quantity of the power return circuit component that significantly reduces and the complexity of power return circuit with current scheme, and the adjustment test operating mode only needs to adjust reactive current injection parameter and injection mode for efficiency of software testing greatly.
The utility model provides a technical scheme real-time supervision and adjustment flow through the capacitive reactive current of current-limiting reactor during high wearing, can effectively avoid high voltage to pass through test point terminal voltage decline phenomenon that equipment under test injected into inductive reactive current and caused during the test, keep the stability of test point terminal voltage during whole high voltage fault, the test result is more true and reliable.
Drawings
Fig. 1 is an electrical schematic diagram of a high voltage ride through testing device based on the dynamic reactive compensation principle of the present invention;
fig. 2 is a primary circuit diagram of a high voltage ride through testing device based on the dynamic reactive compensation principle according to an embodiment of the present invention;
fig. 3 is a timing diagram illustrating the operation of the internal components of the high voltage ride through testing apparatus according to the embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1:
the embodiment of the utility model provides a pair of high voltage ride through testing arrangement in dynamic reactive compensation principle, electric principle is as shown in fig. 1, and the essential element includes inlet wire switch K1, outlet wire switch K2, current-limiting reactance X, bypass switch S1, feed switch S2 and dynamic capacitive reactive power compensator, and the essential principle is that reactive power compensator sends the capacitive current and flows through current-limiting reactance and produce pressure drop lifting test point voltage.
The primary circuit diagram of the device is shown in fig. 2, and comprises: the system comprises a switch cabinet, a current-limiting reactor and a reactive power compensation device SVG; the switch cabinet comprises an incoming line switch cabinet, a first transfer cabinet, a first PT cabinet, a bypass switch cabinet, a second transfer cabinet, a current-feeding switch cabinet, a second PT cabinet and an outgoing line switch cabinet; the reactor only comprises a current-limiting reactor X; the reactive power compensation device comprises a power electronic reactive power compensation device. For convenience, the first switch cabinet will be referred to as switch cabinet 1, the first PT cabinet as PT cabinet 1, the second switch cabinet as switch cabinet 2, and the second PT cabinet as PT cabinet 2 in this embodiment.
The device adopts a double-bus design, a bus 1 is connected to a power grid through a line-in switch cabinet, the line-in switch cabinet, a switching cabinet 1, a PT cabinet 1 and a bypass switch cabinet are connected to the bus 1, a current-limiting reactor is connected to the bus 1 through the switching cabinet 1 and the bypass switch cabinet, a line-out switch cabinet, a switching cabinet 2, a PT cabinet 2 and a current-feeding switch cabinet are connected to the bus 2, a reactive power compensation device is connected to the bus 2 through the current-feeding switch cabinet, and the bus 2 is connected to a tested device through the line-out switch cabinet.
The incoming line switch cabinet, the bypass switch cabinet, the feed-through switch cabinet and the outgoing line switch cabinet can adopt mechanical switches or power electronic valve group switches such as a vacuum circuit breaker, an SF6 circuit breaker or a vacuum contactor.
The current-limiting reactor X can adopt any one of a dry-type hollow-core reactor, a dry-type iron-core reactor, a clamping-type dry-type hollow-core reactor, an oil-immersed hollow-core reactor and an oil-immersed iron-core reactor.
And the SVG adopts a power electronic Static Var Generator (SVG).
Voltage transformers are arranged in the PT cabinet 1 and the PT cabinet 2 and used for measuring the voltages of two sections of voltage buses and respectively correspond to a device incoming line (a power supply point) and a device outgoing line (a test point); any one of an electromagnetic type voltage transformer, a capacitive voltage transformer, or a resistive divider may be employed.
Current transformers are respectively arranged on the incoming line switch cabinet, the bypass switch cabinet, the switching cabinet 2, the feed-through switch cabinet and the outgoing line switch cabinet and used for measuring the current of the incoming line (power supply point), the outgoing line (test point), the current-limiting inductor and the reactive power compensation device, and the transformers can adopt electromagnetic current transformers or Hall current sensors;
and a secondary signal of a current transformer in the switching cabinet 2 and a secondary signal of a voltage transformer in the PT cabinet 2 are sent into the reactive power compensation device, and the capacitive reactive current numerical value and the bus 2 voltage which flow through the current-limiting reactor during a high-voltage fault are judged, so that the reactive current sent by the reactive power compensation device is adjusted in real time, and accurate high-voltage control is realized.
The incoming line switch cabinet, the feed current switch cabinet and the outgoing line switch cabinet are provided with relay protection devices, and loop protection is started when unplanned abnormal overvoltage and overcurrent occur in the system.
The temperature measuring component and the temperature controller are arranged on the current-limiting reactor and the reactive power compensation device, the fan is started to dissipate heat when the temperature of the device is higher, and the protection is started when the temperature of the device is extremely high and the safety is influenced.
The device is provided with a circuit running state bitmap, and the on-off state of each switch in the device and the bus voltage and current parameters are displayed in real time.
Example 2:
the embodiment of the utility model provides a pair of high voltage ride through testing arrangement in dynamic reactive compensation principle, its high voltage fault generation mechanism forms the pressure drop for capacitive reactive current flows through the reactance and raises the voltage, and concrete operation is as follows during the experiment: firstly, the device is connected with an alternating current loop of the tested equipment, the inlet wire end of the device is connected with a power grid, the outlet wire end is connected with the alternating current side of the tested equipment, the inlet wire switch, the outlet wire switch, the bypass switch and the feed switch are all in a closed state, the tested equipment normally operates, after the test starts, the bypass switch is firstly disconnected, the current limiting reactor is put into the loop to operate, then the reactive power compensation device is started, capacitive reactive current is emitted according to preset parameters, the current generates voltage drop at two ends of the current limiting reactor, the voltage of the power grid connected into the device is nearly unchanged during the test, therefore, the output voltage of the device is increased, the parameters of the current limiting reactor in the device are fixed and can not be adjusted, the continuous adjustment of the voltage increasing amplitude can be realized only by adjusting the capacitive current value emitted by the reactive power compensation device, the voltage increasing time is only by controlling the duration time of the compensation current of the reactive power compensation device, and the feed switch cabinet does not need to act during the test, the reactive compensation device mainly plays a protection role, capacitive reactive current flowing through the current-limiting reactor and a voltage rising value of a test point during a test period are monitored in real time by the reactive compensation device, a reactive current compensation value is adjusted according to deviation from a set value, the voltage rising amplitude of the test point is ensured to be accurately determined, and meanwhile, if single-phase or two-phase high-voltage faults need to be simulated, the reactive compensation device is controlled to emit single-phase or two-phase capacitive reactive current.
The operation time of the switch, the current-limiting inductor and the reactive power compensation device in the device is shown in fig. 3, T1 is the off time of the bypass switch and the input time of the current-limiting reactor, T2 is the operation time of the reactive power compensation device, T2 time is completely contained in T1 time, and interval protection is delayed.
The incoming line switch cabinet, the bypass switch cabinet, the feed current switch cabinet and the outgoing line switch cabinet can adopt mechanical switches such as a vacuum circuit breaker, an SF6 circuit breaker or a vacuum contactor or power electronic valve group switches, the switch type selection needs to comprehensively consider action delay, breaking capacity and mechanical/electrical service life, the type selection is carried out according to the test voltage class (35kV, 10kV, 6kV, 690V and 380V) and the device operation capacity (10MVA, 6MVA, 4MVA and 1MVA) of the device, a 10kV/4MVA high voltage ride-through testing device is taken as an example, the switch can select a 10kV/630A vacuum circuit breaker, the short circuit breaking capacity reaches 25kA, the electrical service life can reach 1 thousand times, and the test requirements can be basically met.
The current-limiting reactor X can adopt any one of a dry-type air-core reactor, a dry-type iron-core reactor, a clamping-type dry-type air-core reactor, an oil-immersed air-core reactor and an oil-immersed iron-core reactor, a 10kV/4MVA high-voltage ride-through test device is taken as an example, the short-circuit capacity of a test point is designed to be 4MVA, the parameter of the reactor is 79.58mH, and the ratio of the inductive reactance to the direct-current resistance is larger than 10.
The reactive power compensation device SVG adopts a power electronic static var generator SVG, the capacity of the reactive power compensation device in the device is 10kV/2MVA, a reactor capacitive current compensation value selected for a gear without boosting is shown in the following table, capacitive reactive current of the reactive power compensation device is based on current actually flowing through a current-limiting reactor, the compensation value can be adjusted in real time along with the output current characteristic of tested equipment during testing, and only 1 gear is listed in the table from 105% Un to 140% Un and generated every 5%.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present application and not for limiting the scope of protection thereof, and although the present application is described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that after reading the present application, they can make various changes, modifications or equivalents to the specific embodiments of the application, but these changes, modifications or equivalents are all within the scope of protection of the claims to be filed.
Claims (10)
1. A high voltage ride through test apparatus based on dynamic reactive compensation principle, the apparatus comprising: the system comprises a switch cabinet, a current-limiting reactor and a power electronic reactive power compensation device SVG;
the switch cabinet comprises an incoming line part and an outgoing line part, wherein the incoming line part is connected to a power grid through an incoming line bus, and the outgoing line part is connected to the tested equipment through an outgoing line bus;
the current limiting reactor is connected with the incoming line bus through the incoming line part; the power electronic reactive power compensation device SVG is connected with the outgoing bus through the outgoing part;
capacitive reactive current sent by the power electronic reactive power compensation device SVG flows through the current-limiting reactor to form voltage drop and lifting test point voltage, and high voltage faults in a power grid are simulated so as to carry out high voltage ride through fault test on tested equipment.
2. The apparatus of claim 1,
the incoming line part comprises an incoming line switch cabinet, a first transfer cabinet, a first PT cabinet and a bypass switch cabinet;
the outgoing line part comprises a second switching cabinet, a current-feeding switch cabinet, a second PT cabinet and an outgoing line switch cabinet;
the incoming line bus is connected to a power grid through the incoming line switch cabinet, and the first switching cabinet, the first PT cabinet and the bypass switch cabinet are connected to the incoming line bus; the current limiting reactor is connected to the incoming line bus through the first switching cabinet and the bypass switch cabinet;
the outgoing line switch cabinet, the second transfer cabinet, the second PT cabinet and the current-feedback switch cabinet are connected to the outgoing line bus; and the power electronic reactive power compensation device SVG is connected to the outgoing bus through the current-feeding switch cabinet.
3. The apparatus of claim 2,
the first PT cabinet and the second PT cabinet are respectively provided with a voltage transformer for measuring the voltages of the power grid access end and the tested equipment access end which respectively correspond to the incoming bus and the outgoing bus;
and current transformers are respectively configured on the incoming line switch cabinet, the bypass switch cabinet, the second switching cabinet, the current-feeding switch cabinet and the outgoing line switch cabinet and are used for measuring the currents of the power grid access end of the device, the access end of the tested equipment, the current-limiting reactor and the SVG.
4. The apparatus of claim 2, wherein the incoming line switch cabinet, the bypass switch cabinet, the incoming line switch cabinet and the outgoing line switch cabinet are all mechanical switches or power electronic valve group switches.
5. The device of claim 1, wherein the current limiting reactor is any one of a dry air core reactor, a dry core reactor, a clamp dry air core reactor, an oil immersed air core reactor, and an oil immersed core reactor.
6. The device according to claim 1, characterised in that the power electronic reactive power compensation device SVG employs a power electronic static var generator SVG.
7. The apparatus of claim 3,
the voltage transformer adopts any one of an electromagnetic voltage transformer, a capacitor voltage transformer and a resistance type voltage divider;
the current transformer adopts an electromagnetic current transformer or a Hall current sensor.
8. The device of claim 2, wherein the incoming line switch cabinet, the incoming line switch cabinet and the outgoing line switch cabinet are provided with relay protection devices for starting loop protection when unplanned abnormal overvoltage and overcurrent occur in the system.
9. The device according to claim 1, characterized in that the current-limiting reactor and the power electronic reactive power compensation device SVG are each equipped with a temperature controller.
10. The device according to claim 1, characterized in that the switch cabinet is provided with a state comprehensive display instrument for displaying the on-off state of each switch and the bus voltage and current parameters in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123059303.5U CN217238228U (en) | 2021-12-07 | 2021-12-07 | High voltage ride through testing arrangement based on dynamic reactive compensation principle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123059303.5U CN217238228U (en) | 2021-12-07 | 2021-12-07 | High voltage ride through testing arrangement based on dynamic reactive compensation principle |
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| CN217238228U true CN217238228U (en) | 2022-08-19 |
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| CN202123059303.5U Active CN217238228U (en) | 2021-12-07 | 2021-12-07 | High voltage ride through testing arrangement based on dynamic reactive compensation principle |
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2021
- 2021-12-07 CN CN202123059303.5U patent/CN217238228U/en active Active
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