CN110571819A - novel distribution network voltage regulator device - Google Patents
novel distribution network voltage regulator device Download PDFInfo
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- CN110571819A CN110571819A CN201910861592.9A CN201910861592A CN110571819A CN 110571819 A CN110571819 A CN 110571819A CN 201910861592 A CN201910861592 A CN 201910861592A CN 110571819 A CN110571819 A CN 110571819A
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 109
- 239000003990 capacitor Substances 0.000 claims abstract description 55
- 238000013016 damping Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 abstract description 16
- 238000010586 diagram Methods 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- 230000016507 interphase Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a novel voltage regulating device for a power distribution network. Firstly, the reactor is introduced into the series capacitor branch circuit to restrain the peak current in the switching process of the voltage regulating device, and meanwhile, the discharge lightning arresters are connected in parallel at two ends of the reactor in consideration of the fact that the current of the reactor cannot change suddenly, so that the peak voltage of the reactor in the operation process is restrained. Secondly, a damping reactor is connected in series on a bypass, so that the safe and reliable operation of the whole set of voltage regulating device is ensured. And thirdly, when the load end is low in voltage and low in current, the input of the voltage regulating device is limited by the highest priority, so that the potential safety hazard caused by short-time frequent switching actions of the voltage regulating device is avoided, and the generation of the resonance phenomenon can be effectively avoided. Finally, the voltage regulating device is designed with current quick-break protection, overcurrent protection, overload protection and three-phase voltage unbalance protection, and meanwhile, the voltage regulating device is set with a minimum time interval when the voltage regulating device is continuously switched in twice so as to ensure the safe and reliable operation of equipment.
Description
Technical Field
The invention relates to a novel voltage regulating device for a power distribution network.
background
For a medium-voltage distribution line with large power supply radius and large load fluctuation, the voltage value of a load end is often low and the voltage fluctuation is large due to large voltage loss in the line, so that the voltage quality requirement is difficult to meet. Therefore, it is necessary to perform voltage regulation using a compensation device to increase and stabilize the voltage on the load side. At present, series capacitor compensation is mainly adopted for voltage regulation, and the voltage regulation mode mainly changes the reactance of a circuit by connecting a capacitor compensator in series so as to change the voltage loss on the circuit and realize the regulation of the voltage at the load side. For series capacitance compensation voltage regulation, the compensation capacity is proportional to the square of the line current. Therefore, when the load is increased, the compensation amount of the series capacitance is increased due to the increase of the line current, and the capacitance value of the series capacitance which needs to be increased is smaller. Series compensation has the characteristics of inverse load adjustment in the aspect of compensation effect, and the compensation effect is more obvious when the load is increased during the electricity utilization peak period, so that the parallel compensation has more flexibility and practicability. However, the series compensation also has a corresponding disadvantage, and in the process of exiting the voltage regulating device, because the capacitance reactor has a process of releasing electric energy, fig. 1 shows that the peak current appears at the load end in a short time after the series compensation capacitor exits, and the maximum value can reach approximately 200A, and the peak current will affect the reliability and safety of the load operation. In fig. 2, the maximum amplitude of the voltage at both ends of the reactor reaches 500kV during the exiting process, which far exceeds the rated voltage 12kV of the reactor used in the 10kV system, so that the thermal breakdown of the reactor may be caused. Therefore, in the existing voltage regulating circuit model, at the time when the voltage regulating device exits, due to the discharging process of the capacitor and the reactor, the phenomenon that the voltages at two ends of the reactor are too high can occur, and the power utilization reliability and safety of a load end user are influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a novel distribution network voltage regulating device which can obviously weaken the peak current generated at a load end when a series compensation device is withdrawn or put into use, and can effectively inhibit the peak voltage generated on an energy storage element during the switching transient process of the voltage regulating device by improving a discharge reactor loop in the voltage regulating device, thereby ensuring the safe and reliable operation of the voltage regulating device.
In order to achieve the purpose, the technical scheme of the invention is as follows: a novel voltage regulating device for a power distribution network comprises a voltage regulating main circuit and a voltage regulating control protection circuit;
The voltage regulating main circuit comprises a series compensation capacitor bank branch and a bypass branch; the series compensation capacitor bank branch circuit comprises a first vacuum circuit breaker, a reactor and a compensation capacitor bank which are sequentially connected in series, the series compensation capacitor bank branch circuit also comprises a first lightning arrester connected in parallel at two ends of the reactor and a second lightning arrester connected in parallel at two ends of the compensation capacitor bank, and the bypass branch circuit comprises a second vacuum circuit breaker and a damping reactor which are sequentially connected; one end of the first vacuum circuit breaker is connected with one end of the second vacuum circuit breaker to serve as an input end of the voltage regulating device, and one end of the compensation capacitor bank is connected with one end of the damping reactor to serve as an output end of the voltage regulating device;
The voltage regulation control protection circuit comprises a comprehensive control device, a first voltage transformer and a second voltage transformer, wherein the first voltage transformer is connected with the comprehensive control device and used for detecting the voltage of a distribution line at the front end of the voltage regulation device, and the second voltage transformer is used for detecting the voltage of the distribution line at the rear end of the voltage regulation device.
In an embodiment of the invention, the vacuum circuit breaker further comprises a third vacuum circuit breaker and a fourth vacuum circuit breaker for realizing the input and the exit of the pressure regulating device, and a fifth vacuum circuit breaker for realizing the follow current after the pressure regulating device exits, wherein one end of the third vacuum circuit breaker is connected with the input end of the pressure regulating device, the other end of the third vacuum circuit breaker is connected to the distribution line, one end of the fourth vacuum circuit breaker is connected with the output end of the pressure regulating device, the other end of the fourth vacuum circuit breaker is connected to the distribution line, and the fifth vacuum circuit breaker is arranged between the connection point of the third vacuum circuit breaker and the distribution line and the connection point of the fourth vacuum circuit breaker and the.
In an embodiment of the invention, the series compensation capacitor bank branch further includes a resistor connected in parallel to two ends of the compensation capacitor bank.
In an embodiment of the present invention, the control manner of the integrated control device to implement switching of the voltage regulator is as follows: firstly, considering a load characteristic curve of a load side user, automatically switching in and switching out the load side user at a load peak period, and switching in a voltage regulating device into a bypass branch at a load low peak period; secondly, setting a voltage upper limit threshold value and a voltage lower limit threshold value, putting the voltage regulating device in the case that the voltage is lower than the lower limit value, withdrawing the voltage regulating device in the case that the voltage exceeds the upper limit value, and simultaneously limiting the putting of the voltage regulating device when low voltage and small current are unbalanced with three-phase voltage; and finally, setting current quick-break protection, overcurrent protection and overload protection, and setting a minimum time interval when the voltage regulating device is continuously switched in twice so as to ensure the safe and reliable operation of equipment.
Compared with the prior art, the invention has the following beneficial effects: firstly, the reactor is introduced into the series capacitor branch circuit to restrain the peak current in the switching process of the voltage regulating device, and meanwhile, the discharge lightning arresters are connected in parallel at two ends of the reactor in consideration of the fact that the current of the reactor cannot change suddenly, so that the peak voltage of the reactor in the operation process is restrained. Secondly, in order to effectively restrain the current of a voltage regulating loop in the switching process of the voltage regulating device, a damping reactor is connected in series on a bypass, and the safe and reliable operation of the whole set of voltage regulating device is guaranteed. And thirdly, when the load end is low in voltage and low in current, the input of the voltage regulating device is limited by the highest priority, so that the potential safety hazard caused by short-time frequent switching actions of the voltage regulating device is avoided, and the generation of the resonance phenomenon can be effectively avoided. Finally, three-stage current protection (current quick-break protection, over-current protection and overload protection) and three-phase voltage unbalance protection are designed for the voltage regulating device, and meanwhile, the voltage regulating device is set with the minimum time interval when the voltage regulating device is continuously switched in twice so as to ensure the safe and reliable operation of equipment.
drawings
FIG. 1 is a waveform diagram of the current on the load side during the series compensation exit process of the prior art (abscissa: sec; ordinate: ampere).
Fig. 2 is a waveform diagram of a reactor terminal voltage during a series compensation exit process in the prior art (abscissa: second; ordinate: volt).
Fig. 3 is a schematic circuit diagram of the novel voltage regulator of the power distribution network according to the present invention.
fig. 4 is a control flowchart of the pressure adjusting device.
Fig. 5 is a logic diagram of the quick-break and overcurrent protection operation of the voltage regulator.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention provides a novel power distribution network voltage regulating device, which comprises a voltage regulating main circuit and a voltage regulating control protection circuit, wherein the voltage regulating main circuit comprises a voltage regulating circuit and a voltage regulating control protection circuit; the voltage regulating main circuit comprises a series compensation capacitor bank branch and a bypass branch; the series compensation capacitor bank branch circuit comprises a first vacuum circuit breaker, a reactor and a compensation capacitor bank which are sequentially connected in series, the series compensation capacitor bank branch circuit also comprises a first lightning arrester connected in parallel at two ends of the reactor and a second lightning arrester connected in parallel at two ends of the compensation capacitor bank, and the bypass branch circuit comprises a second vacuum circuit breaker and a damping reactor which are sequentially connected; one end of the first vacuum circuit breaker is connected with one end of the second vacuum circuit breaker to serve as an input end of the voltage regulating device, and one end of the compensation capacitor bank is connected with one end of the damping reactor to serve as an output end of the voltage regulating device; the voltage regulation control protection circuit comprises a comprehensive control device, a first voltage transformer and a second voltage transformer, wherein the first voltage transformer is connected with the comprehensive control device and used for detecting the voltage of a distribution line at the front end of the voltage regulation device, and the second voltage transformer is used for detecting the voltage of the distribution line at the rear end of the voltage regulation device. The series compensation capacitor bank branch circuit further comprises a resistor connected in parallel at two ends of the compensation capacitor bank.
The pressure regulating device further comprises a third vacuum circuit breaker and a fourth vacuum circuit breaker, wherein the third vacuum circuit breaker and the fourth vacuum circuit breaker are used for realizing the fact that the pressure regulating device is put into and withdrawn from, and a fifth vacuum circuit breaker for realizing the follow current after the pressure regulating device is withdrawn from is arranged on the power distribution line.
The control mode of the comprehensive control equipment for realizing switching of the pressure regulating device is as follows: firstly, considering a load characteristic curve of a load side user, automatically switching in and switching out the load side user at a load peak period, and switching in a voltage regulating device into a bypass branch at a load low peak period; secondly, setting a voltage upper limit threshold value and a voltage lower limit threshold value, putting the voltage regulating device in the case that the voltage is lower than the lower limit value, withdrawing the voltage regulating device in the case that the voltage exceeds the upper limit value, and simultaneously limiting the putting of the voltage regulating device when low voltage and small current are unbalanced with three-phase voltage; and finally, setting current quick-break protection, overcurrent protection and overload protection, and setting a minimum time interval when the voltage regulating device is continuously switched in twice so as to ensure the safe and reliable operation of equipment.
The following is a specific implementation of the present invention.
the system diagram of the novel distribution network voltage regulating device of the invention is shown in fig. 3, wherein: d1, D2 and D3 are three vacuum circuit breakers, D2 and D3 are used for inputting and withdrawing the pressure regulating device, and D1 is used for follow current after the pressure regulating device is withdrawn, so that power supply continuity is guaranteed. In the figure, K1 and K2 are vacuum circuit breakers, and the input and the exit of the voltage-regulating capacitor bank are realized; 1 is a comprehensive control device, realizes the automatic switching control of a voltage regulating capacitor, and respectively controls the actions of circuit breakers K1 and K2; 2, a damping reactor is used for limiting the bypass current after the series capacitor is withdrawn; 3 is a reactor for limiting the discharge current of the capacitor; and 4, a series capacitor is used for realizing series capacitance compensation voltage regulation. In addition, the zinc oxide lightning arresters are connected in parallel at the two ends of the reactor to serve as a discharge loop, the design effectively inhibits the voltage peak value of the reactor end when the voltage regulating device exits, and the safety of the reactor operation is greatly improved. And finally, connecting a zinc oxide arrester and a resistor in parallel at two ends of the capacitor to form a discharge loop of the capacitor.
The novel voltage regulating device for the power distribution network comprises a voltage regulating main circuit and a voltage regulating control protection circuit, wherein the voltage regulating main circuit comprises a series branch of a vacuum circuit breaker K1, a reactor 3 and a compensation capacitor bank 4, and further comprises a vacuum circuit breaker K2 (for realizing the exit of the series compensation capacitor bank) and a damping reactor, namely an element 2 in the figure (for effectively inhibiting the loop current when the device is put into and exited).
The voltage regulation control protection circuit mainly refers to a device 1 in the figure, namely a comprehensive control device (YH-693 of YH-600 series produced by Hangzhou Yangyuan electric company Limited) which is used for respectively controlling the actions of circuit breakers K1 and K2, so as to realize the automatic switching control of a voltage regulation system, and simultaneously realize three-stage protection of quick current break, overcurrent and overload by using the device.
1 operation procedure of pressure regulating device of the invention
Before the voltage regulating system is put into operation, whether the whole voltage regulating system is intact, whether a switch, a breaker, a door lock and the like are in place or not, and whether the conditions of putting into operation and power transmission are met or not need to be checked. The initial state before the pressure regulating system is put into operation is as follows: d1 is in the closed state and D2 and D3 are in the open state.
1.1, pressure regulating System put into operation
the vacuum interrupter D2 in fig. 3 is first closed, after which the operating mode, i.e. manual operating mode and automatic operating mode, is selected using the operating mode selector switch, as explained below.
1) Manual mode:
Firstly, the K2 change-over switch is rotated to a closing position, whether the closing action of the K2 is finished or not is observed, then the K2 is switched to an opening position, whether the opening action of the K2 is finished or not is observed, and the action reliability of the circuit breaker K2 is ensured.
secondly, rotating the K1 change-over switch to a closing position, observing whether K1 completes closing action, and then switching to an opening position to observe whether K1 completes opening action, so that the action reliability of the circuit breaker K1 is ensured.
Thirdly, manually operating the K2 change-over switch to a closing position, and keeping a K1 in an opening state;
Fourthly, manually closing the circuit breaker D2 at the outlet end, and opening the circuit breaker D1 after determining that the D2 is switched on, so as to complete the manual input of the voltage regulating system;
Finally, according to the voltage level of the end load side, the voltage regulating capacitor bank is operated manually to complete the operation of the voltage regulating capacitor bank.
2) Automatic mode:
before the automatic operation mode is put into operation, the operation mode change-over switch is firstly selected to be in a manual mode, and the operation of the pressure regulating system is completed from the manual operation mode to the fourth step.
Then, the operation mode change-over switch is switched to an 'automatic' mode, and then the voltage regulating device can complete the operation and exit control of the capacitor bank of the voltage regulating device according to an automatic operation control program in the comprehensive control device, which is as follows:
firstly, when the mode change-over switch of the voltage regulating system is switched to an automatic mode, the comprehensive control equipment outputs a switching-on command to K2 and outputs a switching-off command to K1;
Secondly, automatic switching is carried out by using the voltage detected by the load end, and the method specifically comprises the following steps:
A: when the voltage of the load end is detected to be lower than the voltage lower limit value and continues for a certain time, the voltage-regulating capacitor bank is automatically switched on, and the action time sequence is as follows: firstly, sending a command to close the K1 circuit breaker, and after detecting that K1 is successfully switched on, delaying for a period of time and then disconnecting the K2 circuit breaker to complete the operation of the voltage-regulating capacitor bank.
B: when detecting that load end voltage is higher than voltage upper limit value and lasts for a certain time, the voltage-regulating capacitor bank requires to quit operation, and the action time sequence is: firstly, sending a command to close the K2 circuit breaker, and after detecting that K2 is successfully switched on, delaying for a period of time and then switching off the K1 circuit breaker to finish the operation quitting of the voltage regulating capacitor bank.
1.2, the pressure regulating system quits the operation process
When the pressure regulating system needs to completely quit operation, the operation flow is as follows:
firstly, selecting a manual mode for an operation mode change-over switch, then rotating the change-over switch of K2 to a switching-on state, waiting for 1 minute after a switching-on indicator lamp is turned on, and then manually operating the change-over switch of K1 to a switching-off state. At this time, the operation of withdrawing the voltage-regulating capacitor bank is completed (if the operation is withdrawn and the 'manual' mode is selected, the capacitor bank is already in the operation withdrawing state, the manual closing K2 and then the opening K1 are not needed to be removed).
Secondly, manually closing a vacuum circuit breaker D1; after D1 is detected to be successfully switched on, the switch is manually switched off by D3;
And thirdly, after detecting that the D3 brake is successfully opened, the vacuum circuit breaker D2 is opened again to finish the integral exit operation of the voltage regulating system.
2. Voltage regulation system control and protection design
2.1 Voltage regulating System control design
The control flow chart of the pressure regulating system is shown in fig. 4.
Description of the control flow: firstly, selecting the working mode of the voltage regulating system, then sending an instruction to close the vacuum circuit breaker K2 by the comprehensive protection equipment, and simultaneously opening the vacuum circuit breaker K1 to supply power to a load. And collecting current data of the load side, comparing the data with the minimum load current allowed to be put into the voltage regulating system, and allowing the voltage regulating system to be put into the voltage regulating system only when the load current exceeds the minimum load current allowed to be put into the voltage regulating system. Secondly, acquiring line voltage data of a load end and inputting the data into comprehensive protection equipment for comparison and analysis: the input voltage value of a voltage regulating device (namely U in the figure) is arranged in the comprehensive protection equipment in advancemin) And the exit voltage value (i.e., U in the figure)max) When the line voltage of the load end is lower than the input voltage value, the voltage regulating capacitor is immediately input to send a K1 breaker switching-on command, and after the K1 closed state returns and is confirmed, the K2 breaker switching-off command is sent; when the voltage of the load end line is higher than the exit voltage value, the voltage regulating capacitor is immediately exited, a K2 breaker closing command is sent, a K1 breaker opening command is sent after the K2 closed state returns and is confirmed, then time delay is started, specific time delay time can be set according to requirements, the time delay time is up, relevant operations are executed again according to the collected line voltage data, and therefore cyclic control is achieved.
2.2 Voltage regulating System protection Circuit design
The protection circuit of the voltage regulating system is mainly used for realizing the related protection of the current, the input interval and the like of the voltage regulating system, and the protection circuit is respectively explained below.
2.2.1 quick disconnect and overcurrent protection
The device is provided with two sections of interphase overcurrent protection, the on-off control constant value of each section can independently control the service condition of each section. The value of the switching control fixed value is as follows:
0: withdraw and 1: input
The interphase overcurrent protection is provided with a soft pressing plate, and the corresponding protection section is only put into use when the soft pressing plate and the on-off control fixed value are both put into use.
the quick-break/overcurrent protection is operated only when the K1 series compensation switch is in an on position, and is not operated when the K1 series compensation switch is in an off position. The action process is that the current exceeds the setting value, the K2 bypass switch is closed through the settable delay (namely Tzd1 in the figure), and after the K2 switch is closed, the K1 series compensation switch is tripped through the settable delay (namely Tzd2 in the figure). The action logic diagram is as shown in fig. 5 (Imax in the diagram is the maximum value of the collected load current, and SET _ I is the SET value of the quick break and the overcurrent protection):
2.2.2 overload protection
the load current collected by the comprehensive protection equipment is compared with the preset overload current, and when the collected load current exceeds the preset value, an alarm display is sent out on a screen of the comprehensive protection equipment, but an action instruction is not sent out to the vacuum circuit breaker.
2.2.3 overvoltage protection of capacitors and reactors
In fig. 3, the zinc oxide arrester in parallel with the capacitor and the reactor mainly achieves overvoltage protection. When lightning current flows through the capacitor or the reactor for a short time or overvoltage is caused by other internal operations, the lightning arrester instantaneously acts before the voltage of the capacitor and the reactor reaches the highest withstand voltage, so that accidents such as explosion and the like caused by the fact that the withstand voltage of the capacitor and the reactor exceeds the allowable peak voltage are avoided.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (4)
1. A novel voltage regulating device for a power distribution network is characterized by comprising a voltage regulating main circuit and a voltage regulating control protection circuit;
The voltage regulating main circuit comprises a series compensation capacitor bank branch and a bypass branch; the series compensation capacitor bank branch circuit comprises a first vacuum circuit breaker, a reactor and a compensation capacitor bank which are sequentially connected in series, the series compensation capacitor bank branch circuit also comprises a first lightning arrester connected in parallel at two ends of the reactor and a second lightning arrester connected in parallel at two ends of the compensation capacitor bank, and the bypass branch circuit comprises a second vacuum circuit breaker and a damping reactor which are sequentially connected; one end of the first vacuum circuit breaker is connected with one end of the second vacuum circuit breaker to serve as an input end of the voltage regulating device, and one end of the compensation capacitor bank is connected with one end of the damping reactor to serve as an output end of the voltage regulating device;
The voltage regulation control protection circuit comprises a comprehensive control device, a first voltage transformer and a second voltage transformer, wherein the first voltage transformer is connected with the comprehensive control device and used for detecting the voltage of a distribution line at the front end of the voltage regulation device, and the second voltage transformer is used for detecting the voltage of the distribution line at the rear end of the voltage regulation device.
2. The novel distribution network voltage regulator of claim 1, further comprising a third vacuum circuit breaker and a fourth vacuum circuit breaker for enabling the voltage regulator to be switched in and out, a fifth vacuum circuit breaker for enabling the voltage regulator to follow current after exiting, wherein one end of the third vacuum circuit breaker is connected with the input end of the voltage regulator, the other end of the third vacuum circuit breaker is connected to the distribution line, one end of the fourth vacuum circuit breaker is connected with the output end of the voltage regulator, the other end of the fourth vacuum circuit breaker is connected to the distribution line, the fifth vacuum circuit breaker is arranged at a connection point of the third vacuum circuit breaker and the distribution line, and the connection point of the fourth vacuum circuit breaker and the distribution line is arranged between the connection points of the fourth vacuum circuit breaker and the distribution line.
3. The novel distribution network voltage regulator apparatus of claim 1 wherein the series compensation capacitor bank branch further comprises a resistor connected in parallel across the compensation capacitor bank.
4. A novel distribution network voltage regulating device according to any one of claims 1 to 3, characterized in that the control mode of the integrated control device for implementing switching of the voltage regulating device is as follows: firstly, considering a load characteristic curve of a load side user, automatically switching in and switching out the load side user at a load peak period, and switching in a voltage regulating device into a bypass branch at a load low peak period; secondly, setting a voltage upper limit threshold value and a voltage lower limit threshold value, putting the voltage regulating device in the case that the voltage is lower than the lower limit value, withdrawing the voltage regulating device in the case that the voltage exceeds the upper limit value, and simultaneously limiting the putting of the voltage regulating device when low voltage and small current are unbalanced with three-phase voltage; and finally, setting current quick-break protection, overcurrent protection and overload protection, and setting a minimum time interval when the voltage regulating device is continuously switched in twice so as to ensure the safe and reliable operation of equipment.
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|---|---|---|---|
| CN201910861592.9A CN110571819A (en) | 2019-09-12 | 2019-09-12 | novel distribution network voltage regulator device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910861592.9A CN110571819A (en) | 2019-09-12 | 2019-09-12 | novel distribution network voltage regulator device |
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| CN114142484A (en) * | 2021-11-30 | 2022-03-04 | 广东电网有限责任公司东莞供电局 | Method and system for running wheel replacement capacitor |
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| CN114142484B (en) * | 2021-11-30 | 2024-04-12 | 广东电网有限责任公司东莞供电局 | Method and system for running alternate capacitor |
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Application publication date: 20191213 |