CN112803432B - One-key sequential control starting and stopping method for magnetic control type parallel reactor - Google Patents
One-key sequential control starting and stopping method for magnetic control type parallel reactor Download PDFInfo
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- CN112803432B CN112803432B CN201911105744.9A CN201911105744A CN112803432B CN 112803432 B CN112803432 B CN 112803432B CN 201911105744 A CN201911105744 A CN 201911105744A CN 112803432 B CN112803432 B CN 112803432B
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
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- 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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Abstract
The invention discloses a one-key sequential control starting and stopping method for a magnetically controlled shunt reactor, and belongs to the technical field of automatic control of electrical engineering. The invention realizes 'one-key' sequential control starting and stopping, improves the automation level of the transformer substation, reduces the risk of misoperation and lightens the workload of operators. The invention is realized by adopting a software logic function, is convenient to control, has no hardware cost increase, and ensures the safe and reliable start and stop of the MCSR.
Description
Technical Field
The invention relates to the technical field of automatic control of electrical engineering, in particular to a one-key sequential control start-stop method for a magnetically controlled shunt reactor.
Background
The Magnetic Control Shunt Reactor (MCSR) is an important reactive compensation device, and is a new reactive compensation technology that can be used in an ultra-high voltage power grid, and the continuous adjustment of the reactive capacity of the Reactor body is realized by adjusting the direct current of the MCSR control winding. The method can be used for limiting power frequency overvoltage, operating overvoltage, improving circuit reclosing success rate and the like in a power grid.
The MCSR is mainly applied to a high-voltage alternating-current power transmission system. The MCSR system has more devices, and when the MCSR system is started and stopped, manual step-by-step operation steps are complicated, the automation level is low, and misoperation accidents easily occur. One-touch start-stop control has received increasing attention as a very effective method for improving the automation level. One key opens and stops control function reinforce, can improve and open the exactness, the standardization of opening the operation, alleviate operation personnel's working strength by a wide margin. Meanwhile, the safety of equipment operation can be enhanced by starting and stopping the equipment by one key, the starting and stopping operation time is shortened, and the automation level of the transformer substation is improved on the whole.
From the aspects of reducing the workload of MCSR operation and maintenance personnel, providing automation level, reducing the risk of misoperation accidents and the like, the method has high requirements on MCSR one-key sequential control starting and stopping.
Disclosure of Invention
The invention provides a one-key sequential control start-stop method of a magnetically controlled shunt reactor to overcome the defects in the prior art, which can realize one-key sequential control start-stop of an MCSR, improve the automation level of the MCSR operation, reduce the risk of misoperation and ensure the safe operation of the MCSR.
In order to solve the technical problem, the invention provides a one-key sequential control start-stop method for a magnetically controlled shunt reactor, which is characterized in that the magnetically controlled shunt reactor comprises a reactor body, a filter bank, a self-excitation and an external excitation;
a network side winding of the reactor body is connected to a high-voltage side line through a network side isolation knife and a network side breaker; the compensation side winding is connected with a compensation side bus through a compensation side wiring handcart; the filter bank is connected with the compensation side bus through a filter breaker; one end of the self-excitation circuit breaker is connected to a compensation side bus to obtain electricity, and the other end of the self-excitation circuit breaker is connected to a control winding of the reactor body through a self-excitation isolation knife after rectification; one end of the external excitation is powered from an external excitation power supply through an external excitation breaker, and the other end of the external excitation is connected to a control winding of the reactor body through an external excitation isolation knife after being rectified;
the one-key sequential control starting process comprises the following steps:
in response to the received start command, judging whether the high-voltage side line is electrified according to whether the voltage of the high-voltage side line is not less than Un,
if the voltage of the high-voltage side line is less than Un, judging that the high-voltage side line is uncharged, judging whether an uncharged starting condition is met, and if so, sequentially executing a combined self-excited isolation knife, a combined self-excited breaker, a combined external excited isolation knife, a combined external excited breaker, an input external excitation, a combined network side isolation knife, a combined network side breaker, and a filter bank operation after the line is charged;
if the voltage of the high-voltage side circuit is not less than Un, judging that the high-voltage side circuit is electrified, judging whether an uncharged starting condition is met, and if so, sequentially executing the operations of closing a self-excitation isolating knife, closing a self-excitation circuit breaker, closing a network side isolating knife, closing a network side circuit breaker, putting into self-excitation and putting into a filter bank;
the one-key sequential control exit process comprises the following steps:
responding to the received exit command, and if the reactor is not more than QminAnd then sequentially executing the operation of a network-dividing side circuit breaker, a network-dividing side isolation knife, a withdrawing self-excitation, a dividing self-excitation circuit breaker, a dividing self-excitation isolation knife and a dividing filter circuit breaker.
Further, in the starting process, the starting step can be executed only when all main components in the MCSR system need to be judged to be intact, and then the MCSR uncharged starting condition is as follows: the high-voltage side circuit is not electrified, the reactor body is not in fault, the self-excitation system is not in fault, the external excitation system is not in fault, the protection device is not in fault, the filter bank is not in fault, the grid side circuit breaker, the grid side isolation knife, the filter circuit breaker, the self-excitation isolation knife, the external excitation circuit breaker and the external excitation isolation knife are not in fault.
Further, the charged starting conditions of the MCSR are as follows: the high-voltage side circuit is electrified, the reactor body has no fault, the self-excitation system has no fault, the protection device has no fault, the filter bank has no fault, the grid side circuit breaker, the grid side isolation knife, the filter circuit breaker, the self-excitation circuit breaker and the self-excitation isolation knife have no fault.
Furthermore, in the process of starting sequence control, when a certain step fails, resetting means that all operations executed before the step are returned, and the MCSR system is restored to the state before commissioning.
Further, Un is 0.6 times the rated value.
Further, Qmin3% rated capacity.
Compared with the prior art, the invention has the following beneficial effects: realize "one key formula" and open in the same direction as controlling to open and stop, improve the automation level of transformer substation, reduce the risk of maloperation, alleviate operation personnel's work load. The invention is realized by adopting a software logic function, is convenient to control, has no hardware cost increase, and ensures the safe and reliable start and stop of the MCSR.
Drawings
FIG. 1 is a schematic diagram of an MCSR system;
FIG. 2 is a MCSR primary wiring diagram;
FIG. 3 is a flow chart of MCSR sequencing start;
fig. 4 is a flow chart of MCSR sequencing stop.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in the attached figure 1, is a schematic diagram of a magnetically controlled shunt reactor MCSR system. The MCSR mainly comprises a reactor body, an excitation system, a protection device, a filter bank, a network side circuit breaker, a network side isolation knife (isolation knife switch) and the like. The reactor body comprises a network side winding (a network side A, B, C phase winding in a figure), a control side winding and a compensation side winding, the network side winding is connected with a power grid (a high-voltage side circuit in the figure), the control side winding is connected with a control current output by an excitation system to realize that the reactance value is adjustable, and the compensation side winding provides power for the self-excitation transformer and is connected with a filter bank. The excitation system comprises a self-excitation system and an external excitation system, the excitation system rectifies an alternating current power supply and then adds the rectified alternating current power supply to a control winding of the reactor, and the connection regulation of the capacity of the reactor is realized by regulating the current of the control winding; the protection device provides protection functions for the reactor body, the filter bank and the excitation system; the filter bank is connected to the compensation side winding and used for reducing current harmonics in the grid side winding after MCSR grid connection.
As shown in fig. 2, which is a primary connection diagram of the MCSR, a grid-side winding of the reactor body is connected to a high-voltage-side line through a grid-side isolation blade and a grid-side breaker; the compensation side winding is connected with a compensation side bus through a compensation side wiring handcart; the filter bank is connected with the compensation side bus through a filter breaker; one end of a self-excitation (including a self-excitation transformer and a self-excitation rectifier bridge) is connected to a compensation side bus through a self-excitation circuit breaker to obtain electricity, and the other end of the self-excitation rectifier bridge is connected to a control winding of the reactor body through a self-excitation isolation knife after rectification; one end of an external excitation (comprising an external excitation transformer and an external excitation rectifier bridge) is connected with the power supply of the external excitation through an external excitation breaker, and the other end of the external excitation is connected with the control winding of the reactor body through an external excitation isolation knife after being rectified. Wherein the self-excitation can be 1 or more.
Before the MCSR is put into operation, the grid side circuit breaker, the grid side isolation knife, the filter circuit breaker, the self-excited isolation knife, the external-excited circuit breaker and the external-excited isolation knife are all in a disconnected state, and the self-excited rectifier bridge and the external-excited rectifier bridge do not work. In the MCSR starting and stopping process, the breaker switch and the disconnecting link are required to be operated, and the self-excitation rectifier bridge and the external excitation rectifier bridge are required to be switched on and off. Therefore, the MCSR starting and stopping process is complicated, and the sequence is wrong, so that safety accidents are easily caused.
As shown in fig. 3, in order to implement the step of one-key sequential control start of the magnetically controlled shunt reactor according to the embodiment of the present invention, when starting, an operator clicks a "start-up input" button on a background computer of the monitoring system, and then the monitoring system automatically executes according to the set logic steps, so as to implement the one-key sequential control input of the MCSR.
The detailed starting sequence control steps are as follows:
step 1: the monitoring system judges whether a magnetic control high-impedance starting command (a command generated by clicking a 'starting input' button) manually sent by an operator is received, if so, the step 2 is carried out, and if not, the monitoring system is continuously in a waiting state;
and 2, step: the monitoring system judges whether the high-voltage side line is electrified or not according to whether the voltage of the high-voltage side line is not less than Un (0.6 times of rated value is default and fixed value is adjustable), if the voltage of the high-voltage side line is less than Un, the high-voltage side line is judged to be uncharged, the step 3 is carried out, and if the voltage of the high-voltage side line is not less than Un, the high-voltage side line is judged to be electrified, and the step 14 is carried out;
and 3, step 3: the monitoring system judges whether uncharged starting conditions are met, if yes, the step 4 is carried out, if not, starting failure is reported, and the starting process is exited;
in the starting process, the step of starting can be executed only when all main components in the MCSR system are judged to be intact, and the MCSR uncharged starting condition is as follows: the high-voltage side circuit is not electrified, the reactor body is not in fault, the self-excitation system is not in fault, the external excitation system is not in fault, the protection device is not in fault, the filter bank is not in fault, the grid side circuit breaker, the grid side isolation knife, the filter circuit breaker, the self-excitation isolation knife, the external excitation circuit breaker and the external excitation isolation knife are not in fault;
and 4, step 4: the monitoring system integrates the self-excited isolation cutter, and delays to judge whether the self-excited isolation cutter is successful, if so, the step 5 is continued, if not, the reset is carried out, the starting failure is reported, and the starting process is quitted;
and 5: the monitoring system closes the self-excited circuit breaker, delays to judge whether the circuit breaker is successful or not, continues to the step 6 if the circuit breaker is successful, resets if the circuit breaker is failed, reports the starting failure and exits the starting process;
and 6: the monitoring system combines the external excitation isolation cutter, delays to judge whether the external excitation isolation cutter is successful, continues to the step 7 if the external excitation isolation cutter is successful, resets if the external excitation isolation cutter is failed, reports the starting failure and exits the starting process;
and 7: the monitoring system is combined with an external excitation circuit breaker, whether the external excitation circuit breaker succeeds or not is judged in a delayed mode, if the external excitation circuit breaker succeeds, the step 8 is continued, if the external excitation circuit breaker fails, resetting is carried out, starting failure is reported, and the starting process is quitted;
and 8: the monitoring system sends an external excitation input signal to the excitation system, delays and judges whether the external excitation input is successful or not, if so, continues to the step 9, and if not, resets, reports the starting failure and exits the starting process;
and step 9: the monitoring system separates the cutter at the network closing side, and delays to judge whether the cutter is successful, if the cutter is successful, the step 10 is continued, if the cutter is failed, the cutter is reset, the starting failure is reported, and the starting process is quitted;
step 10: monitoring a system network-connection side circuit breaker, delaying to judge whether the circuit breaker succeeds or not, if the circuit breaker succeeds, sending out a signal allowing 'live signal', waiting for power transmission to a high-voltage side circuit, and then entering step 11; if the failure occurs, resetting, reporting the starting failure and exiting the starting process;
step 11: the monitoring system sends a self-excitation input signal and an external excitation exit signal after judging that the line is electrified according to the fact that the voltage of the high-voltage side line is more than or equal to Un;
step 12: the monitoring system adjusts the capacity of the reactor according to a pre-designed target value of the reactor;
step 13: the monitoring system judges that the capacity of the reactor is more than or equal to 10% of a rated value Qn, a signal of a combined filter breaker is sent out in a delayed mode and put into a filter bank, and the step 22 is carried out;
step 14: the monitoring system judges whether the charged starting condition is met, if yes, the step 15 is carried out, if not, the starting failure is reported, and the starting process is exited;
the MCSR electrification starting conditions are as follows: the high-voltage side circuit is electrified, the reactor body has no fault, the self-excitation system has no fault, the protection device has no fault, the filter bank has no fault, the grid side circuit breaker, the grid side isolation knife, the filter circuit breaker, the self-excitation circuit breaker and the self-excitation isolation knife have no fault;
step 15: the monitoring system integrates the self-excited isolation cutter, and delays to judge whether the self-excited isolation cutter is successful, if the self-excited isolation cutter is successful, the step 16 is continued, if the self-excited isolation cutter is failed, the self-excited isolation cutter is reset, the starting failure is reported, and the starting process is exited;
step 16: the monitoring system closes the self-excited circuit breaker, and delays to judge whether the circuit breaker is successful, if the circuit breaker is successful, the step 17 is continued, if the circuit breaker is failed, the circuit breaker is reset, the starting failure is reported, and the starting process is exited;
and step 17: the monitoring system closes the network and separates the knife, and delay judges whether to succeed, if succeed continue step 18, if fail then reset, and report and start the failure, withdraw from and start the procedure;
step 18: monitoring a system network-connection side circuit breaker, delaying to judge whether the circuit breaker succeeds or not, if the circuit breaker succeeds, continuing to the step 19, if the circuit breaker fails, resetting, reporting the starting failure, and exiting the starting process;
step 19: after the reactor is connected to the grid, the monitoring system delays for 5 seconds to send a self-excitation signal to the excitation system, and the excitation system is used for switching into a self-excitation rectifier bridge;
step 20: the monitoring system adjusts the capacity of the reactor according to a pre-designed target;
step 21: the monitoring system measures that the capacity of the reactor is larger than a rated value of 10%, a closing instruction of a filter breaker is sent out in a delayed mode, the reactor is put into a filter bank, and the step 22 is carried out;
step 22: the startup procedure ends.
Furthermore, in the process of starting sequence control, when a certain step fails, resetting means that all operations executed before the step are returned, and the MCSR system is restored to the state before commissioning.
As shown in fig. 4, in the one-key sequential control stop method for the magnetically controlled shunt reactor according to the embodiment of the present invention, when an operator clicks a "stop exit" button on a monitoring background computer, the monitoring background automatically executes according to set logic steps, so as to implement one-key sequential control exit of the MCSR.
The detailed exiting sequence control steps are as follows:
step 1: the monitoring system judges whether a magnetic control high-resistance exit command (a command generated by clicking a stop exit button) sent by an operator is received, if so, the monitoring system enters the step 2, and if not, the monitoring system is continuously in a waiting state;
step 2: the monitoring system judges whether the reactive power of the reactor is greater than Qmin(defaults 3% of rated capacity, the fixed value is adjustable, the maximum value does not exceed 10% of the rated capacity; if so, step 3 is executed, otherwise, step 4 is executed;
and step 3: monitoring system reduces reactive power of reactor to QminReturning to the step 2;
and 4, step 4: monitoring a circuit breaker on the network side of the system, delaying to judge whether the circuit breaker is successful, continuing the step 5 if the circuit breaker is successful, entering the step 10 if the circuit breaker is failed, sending a flow alarm, and reporting a failure of the sequential control;
and 5: the monitoring system divides the network side to separate the knife, and delay and judge whether to succeed, if succeed, continue step 6, if fail, enter step 10, and send out the flow alarm, report and control and stop failing;
step 6: the monitoring system sends a self-excitation stopping signal to the excitation system, the excitation system retreats from the excitation rectifier bridge after receiving the signal, and the step 7 is carried out;
and 7: the monitoring system is divided into self-excited circuit breakers, whether the self-excited circuit breakers are successful or not is judged in a delayed mode, if the self-excited circuit breakers are successful, the step 8 is continued, and if the self-excited circuit breakers are failed, a flow alarm is sent, and the step 8 is continued;
and step 8: the monitoring system divides the self-excited knife and delays to judge whether the self-excited knife is successful, if so, the step 9 is continued, and if not, a flow alarm is sent out, and the step 9 is continued;
and step 9: monitoring a system branch filter circuit breaker, delaying to judge whether the system branch filter circuit breaker succeeds or not, continuing to the step 10 if the system branch filter circuit breaker succeeds, and sending a flow alarm if the system branch filter circuit breaker fails, and continuing to the step 10;
step 10: the stop flow ends.
The one-key sequential control start-stop control method of the magnetically controlled shunt reactor aims to realize one-key automatic start-stop of the steps of magnetically controlled high-resistance start-stop through a reasonable and effective control process (the start-stop sequential control step), improve the automation level of a transformer substation, reduce the workload of operators and reduce the risk of misoperation.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A one-key sequential control starting and stopping method of a magnetic control type shunt reactor is characterized in that the magnetic control type shunt reactor comprises a reactor body, a filter bank, self excitation and external excitation;
a network side winding of the reactor body is connected to a high-voltage side circuit through a network side isolation knife and a network side breaker; the compensation side winding is connected with a compensation side bus through a compensation side wiring handcart; the filter bank is connected with the compensation side bus through a filter breaker; one end of the self-excitation circuit breaker is connected to a compensation side bus to obtain electricity, and the other end of the self-excitation circuit breaker is connected to a control winding of the reactor body through a self-excitation isolation knife after rectification; one end of the external excitation is powered from an external excitation power supply through an external excitation breaker, and the other end of the external excitation is connected to a control winding of the reactor body through an external excitation isolation knife after being rectified;
the one-key sequential control starting process comprises the following steps:
in response to the received start command, judging whether the high-voltage side line is electrified according to whether the voltage of the high-voltage side line is not less than Un,
if the voltage of the high-voltage side line is less than Un, judging that the high-voltage side line is uncharged, judging whether an uncharged starting condition is met, and if so, sequentially executing a combined self-excited isolation knife, a combined self-excited breaker, a combined external excited isolation knife, a combined external excited breaker, an input external excitation, a combined network side isolation knife, a combined network side breaker, and a filter bank operation after the line is charged;
if the voltage of the high-voltage side circuit is not less than Un, judging that the high-voltage side circuit is electrified, judging whether an uncharged starting condition is met, and if so, sequentially executing the operations of closing a self-excitation isolating knife, closing a self-excitation circuit breaker, closing a network side isolating knife, closing a network side circuit breaker, putting into self-excitation and putting into a filter bank;
the one-key sequential control exit process comprises the following steps:
responding to the received exit command, and if the reactor is not more than QminAnd then sequentially executing the operation of a network-dividing side circuit breaker, a network-dividing side isolation knife, a withdrawing self-excitation, a branch self-excitation circuit breaker, a branch self-excitation isolation knife and a branch filter circuit breaker.
2. The one-key sequential control start-stop method of the magnetically controlled shunt reactor according to claim 1, characterized in that the uncharged start-up conditions are as follows: the high-voltage side circuit is not electrified, the reactor body is not in fault, the self-excitation system is not in fault, the external excitation system is not in fault, the protection device is not in fault, the filter bank is not in fault, the grid side circuit breaker, the grid side isolation knife, the filter circuit breaker, the self-excitation isolation knife, the external excitation circuit breaker and the external excitation isolation knife are not in fault.
3. The one-key sequential control start-stop method of the magnetically controlled shunt reactor according to claim 1, characterized in that the electrified start-up conditions are as follows: the high-voltage side circuit is electrified, the reactor body has no fault, the self-excitation system has no fault, the protection device has no fault, the filter bank has no fault, the grid side circuit breaker, the grid side isolation knife, the filter circuit breaker, the self-excitation circuit breaker and the self-excitation isolation knife have no fault.
4. The one-key sequential control start-stop method for the magnetically controlled shunt reactor according to claim 1, characterized in that in the one-key sequential control start-up process, if the executed operation fails, the one-key sequential control start-up method is reset, wherein the reset refers to that all the operations executed before the step are returned, and the MCSR system is restored to the state before commissioning.
5. The one-key sequential control start-stop method of the magnetically controlled shunt reactor according to claim 1, characterized in that Un is 0.6 times of rated value.
6. The one-key sequential control start-stop method of the magnetically controlled shunt reactor as claimed in claim 1, wherein Q ismin3% of rated capacity.
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