CN104332989A - Active power distribution network voltage dip treatment method based on eddy current drive quick breaker - Google Patents

Abstract

The invention relates to an active power distribution network voltage dip treatment method based on eddy current drive quick breaker, belonging to the power quality technology field of electrical power system. The method adopts the eddy current drive quick breaker for quickly switching the power supply at sensitive load point, offering the reverse current by combining with distributed generation of the active power distribution network at the time of voltage dip, offering residual voltage support for the sensitive load point during the switching process of the power supply and treating the voltage dip of the sensitive load point. The voltage dip treatment method is low in cost and reliable in operation, the voltage dip treatment method can continuously offer the power for the sensitive load point while the sensitive load point in the electrical power system has voltage dip, and the loss caused by voltage dip can be reduced for the sensitive load user.

Description

The active distribution network voltage collapse administering method of high speed circuit breaker is driven based on eddy current

Technical field

The present invention relates to a kind of active distribution network voltage collapse administering method driving high speed circuit breaker based on eddy current, belong to electric power quality technical field.

Background technology

Voltage collapse in electric power system is that the power-frequency voltage effective value of certain point in electric power system drops to suddenly the 10%-90% of rated value, and normal process is recovered after the of short duration duration of 10ms-1min subsequently, it is the problem of electric power quality technical field research.Sensitive load is called to the electric load of the voltage collapse sensitivity in electric power system.

In modern industrial enterprise, the proportion of sensitive load improves day by day, and sensitive load may excise automatically when voltage collapse occurs, once excision, resumes production and needs several hours even time of several days, can cause huge loss thus.

In order to weaken the impact of the voltage collapse in electric power system on sensitive load, some administering method were proposed respectively from electric power system and load side two aspects in the world.The administering method of electric power system side comprises increases network nargin, use solid-state switch to change network topology, improve electric power system surrounding enviroment etc.The administering method of load side comprise use anti-voltage collapse A.C. contactor, uninterrupted power supply (UPS) is installed, the self-starting etc. in batches of energy storage device and dynamic voltage compensator (DVR), motor is installed.

These administering method all can play certain effect at weakening voltage collapse in the impact of sensitive load, but also there are some shortcomings.Such as, the waste that network nargin may cause the equipment energy is increased too much; Use the cost of the solid-state switch of power electronic technology, DVR too expensive; UPS is not suitable for powerful sensitive load; The self-starting in batches of motor is after voltage collapse has influence on production, in order to avoid electric motor starting causes voltage collapse again, causes further loss, helpless for the voltage collapse for electrical measurement.

Active distribution network has the power supply load control measures such as distributed power generation, energy storage, electric automobile and Demand Side Response, can for the actual motion state of electric power system, with economy fail safe for control objectives, the power distribution network of its network of Automatic adjusument, generating and load.The active distribution network technology that research is advanced, has become the strategic objective of domestic and international development in science and technology and energy technology progress.For reaching this strategic objective, distributed power source is constantly popularized in China, the administering method adopting distributed power source to carry out residual voltage support during voltage collapse has been provided with certain blank, but a lot of distributed power source itself have employed electronic power inverter, if the duration of voltage collapse is long, amplitude is large, then there is too high requirement to the low-voltage crossing ability of this kind of distributed power source.

If be equipped with high-speed switch in active distribution network, timely isolated fault power supply can be realized, and by the function of load switching to stand-by power supply, the time that distributed power source carries out residual voltage support will be shortened, low-voltage crossing ability for distributed power source just can reduce greatly, and the capacity requirement for the distributed power source not adopting diesel engine generator one class of electronic power inverter also can reduce greatly.Eddy current drives high speed circuit breaker to be a kind of high-speed switch adopting electromagnetic force driving switch divide-shut brake, sub-switching operation can be realized within 10ms, there is the responsiveness that can match in excellence or beauty with the solid-state switch that have employed power electronic technology, and be also better than solid-state switch in cost and reliability.Eddy current drives high speed circuit breaker to be generally applied to the fast shut-off of short circuit overcurrent at present.

Summary of the invention

The object of the invention is to propose a kind of active distribution network voltage collapse administering method driving high speed circuit breaker based on eddy current, eddy current is driven high speed circuit breaker be applied to voltage collapse occur time trouble power isolation and stand-by power supply switch fast, switch with rapid isolated fault with to stand-by power supply, reduce the time demand that distributed power source residual voltage supports, thus reduce distributed power source fluctuation to the potential impact of sensitive load.

The active distribution network voltage collapse administering method driving high speed circuit breaker based on eddy current that the present invention proposes, comprises the following steps:

(1) between the inlet wire transformer and mains side sectionalized bus of active distribution network, an electric power incoming line circuit breaker is connected, between mains side sectionalized bus and standby electricity source sectionalized bus, connect a section breaker, described electric power incoming line circuit breaker and section breaker are that eddy current drives high speed circuit breaker;

(2) sense of current setting electric power incoming line inflow mains side sectionalized bus is positive direction, and the current signal collector in active distribution network detects the current phase angle on electric power incoming line voltage signal collector in active distribution network detects the voltage phase angle at sensitive load point place if then judge that electric current on electric power incoming line is as forward current, if then judge that electric current on electric power incoming line is as reverse current;

(3) voltage signal collector in active distribution network detects the voltage of mains side sectionalized bus in real time, according to mains side sectionalized bus voltage, calculates effective value U (k) of mains side sectionalized bus voltage,

Wherein, k is the sequence number of the mains side sectionalized bus place voltage effective value that voltage signal collector detects, the voltage effective value of the mains side sectionalized bus that U (k) detects for voltage signal collector kth time, i is the sequence number of the instantaneous voltage that voltage signal collector collects, u _ifor the instantaneous voltage that voltage signal collector collects at i-th time, N is the number of instantaneous voltage, and the value of N is generally the number of the instantaneous voltage that voltage signal collector gathers in half power frequency period;

(4) the minimum tolerance value U of sensitive load voltage is set _tol, the voltage of mains side sectionalized bus is judged, if U (k) is less than U _tol, then judge that mains side sectionalized bus voltage that voltage signal collector detects is as lower, if U (k) is more than or equal to U _tol, then judge that voltage signal collector does not detect the voltage that mains side sectionalized bus is lower;

(5) according to the result of determination of the sense of current on above-mentioned steps (2) electric power incoming line and step (4) mains side sectionalized bus voltage, if the electric current on electric power incoming line is reverse current, and mains side sectionalized bus voltage is lower, then judge, at the mains side sectionalized bus place of active distribution network, voltage collapse occurs, the controller be connected with described electric power incoming line circuit breaker in active distribution network sends open command to electric power incoming line circuit breaker, carry out step (6), if the electric current on electric power incoming line is reverse current, mains side sectionalized bus voltage is not lower, then repeat step (2)-step (4), if the electric current on electric power incoming line is forward current, and mains side sectionalized bus voltage is not lower, then repeat step (2)-step (4), if mains side sectionalized bus voltage is lower, and the electric current on electric power incoming line is forward current, then judge that mains side sectionalized bus place is short-circuited fault, the controller be connected with described electric power incoming line circuit breaker in active distribution network sends open command to electric power incoming line circuit breaker, carry out step (6),

(6) open command is performed in 10 milliseconds after electric power incoming line circuit breaker receives open command, and according to the result of determination of step (5), carry out following operation: if voltage collapse occurs at the mains side sectionalized bus place of active distribution network, then carry out step (7), the fault if mains side sectionalized bus place is short-circuited, then carry out malfunction elimination to mains side bus;

(7) disconnect at described electric power incoming line circuit breaker, and when described section breaker not yet closes a floodgate, the sensitive load of active distribution network is powered by the distributed power source of active distribution network;

(8) judge the closing operation of described section breaker, detailed process is as follows:

(8-1) the initial phase angle φ of mains side sectionalized bus voltage when the voltage signal collector of active distribution network gathers disconnection moment of electric power incoming line circuit breaker ₁, the standby electricity source voltage signal collector of active distribution network gathers the initial phase angle φ of standby electricity source sectionalized bus voltage ₂, calculate initial phase angular difference φ ₀=φ ₂-φ ₁, the frequency f of the voltage signal collector Real-time Collection mains side sectionalized bus voltage in active distribution network ₁, the frequency f of the standby electricity source voltage signal collector Real-time Collection standby electricity source sectionalized bus voltage of active distribution network ₂, calculated rate difference Δ f=f ₂-f ₁;

(8-2) adopt following formula, calculate the phase angle difference Δ φ of the voltage at sensitive load point place and the voltage of stand-by power supply in t active distribution network:

$\mathrm{\Δ\φ}\left(t\right)={\mathrm{\φ}}_0+\underset{0}{\overset{t}{\∫}}2\mathrm{\π\Δfdt}$

Set the setting value of phase angle difference setting value and difference on the frequency respectively, the closing operation of section breaker is judged, if phase angle difference is less than or equal to phase angle difference setting value, and difference on the frequency is less than or equal to difference on the frequency setting value, then judges that section breaker possesses combined floodgate condition, and perform step (9), if phase angle difference is greater than phase angle difference setting value, and difference on the frequency is less than or equal to difference on the frequency setting value, then judge that section breaker does not possess combined floodgate condition, carries out step (8-3); If phase angle difference is greater than phase angle difference setting value, and difference on the frequency is greater than difference on the frequency setting value, then judge that section breaker does not possess combined floodgate condition, carry out step (8-3); If phase angle difference is less than or equal to phase angle difference setting value, and difference on the frequency is greater than difference on the frequency setting value, then judge that section breaker does not possess combined floodgate condition, carry out step (8-3);

(8-3) according to the computing formula of step (8-2), continue to calculate phase angle difference Δ φ, until during Δ φ=360 °, judge that section breaker possesses combined floodgate condition, carry out step (9);

(9) be connected with section breaker in active distribution network described in controller send reclosing command to section breaker;

(10) after section breaker closes a floodgate, by the stand-by power supply in active distribution network and distributed power source jointly for sensitive load is powered.

The active distribution network voltage collapse administering method driving high speed circuit breaker based on eddy current that the present invention proposes, its advantage is: this method make use of the Fast Speed Vacuum Circuit Breaker of Quick eddy Driving technique, the core component of apparatus for fast switching is driven as eddy current, compared with traditional circuit breaker, this circuit breaker utilizes electromagnetic force to perform the divide-shut brake of circuit breaker, there is responsiveness faster, sub-switching operation can be completed within 10ms.The Fast Speed Vacuum Circuit Breaker of Quick eddy Driving technique is adopted to be generally used for the cut-out of Short-Circuit High Current, be arranged on electric power incoming line place in the present invention, the duration of sensitive load point place voltage collapse can be reduced, reduce the impact that voltage collapse normally works on sensitive load.The controller utilizing the distributed power source possessed in active distribution network to can be implemented in apparatus for fast switching when voltage collapse occurs provides reverse current signal, reduces the possibility of apparatus for fast switching malfunction.Carrying out in the process that trouble power switches to stand-by power supply, sensitive load point is powered by distributed power source, makes sensitive load point place still can keep certain magnitude of voltage.This method can reach the voltage collapse regulation effect close with adopting power electronic equipment scheme, and avoids the use of power electronic equipment, is one low cost, more reliably voltage collapse administering method more.When in electric power system, voltage collapse occurs at sensitive load point place, system can realize the uninterrupted power supply of sensitive load by the inventive method, reduces the loss that sensitive load user is caused by voltage collapse.

Accompanying drawing explanation

Fig. 1 is the structured flowchart of the active distribution network dual power supply system driving the active distribution network voltage collapse administering method of high speed circuit breaker to relate to based on eddy current that the present invention proposes.

Fig. 2 is the structural representation that the eddy current used in the inventive method drives high speed circuit breaker.

In Fig. 1 and Fig. 2,1 is inlet wire transformer, and 2 is electric power incoming line circuit breakers, 3 is section breaker, 2 and 3 all adopt eddy current to drive high speed circuit breaker, and 4 is stand-by power supply lead-in circuit breakers, and its model is determined by real system, 5 is mains side sectionalized buss, 6 is standby electricity source sectionalized buss, and 7 is stand-by power supply side transformers, and 8 is fixed contacts, 9 is moving contacts, and 10 is vacuum interrupters.11 is insulators, and 12 is switching windings, and 13 is eddy-current discs, and 14 is closing coils, and 15 is bistable mechanisms, and 16 is trip inspection slowdown monitoring switch, and 17 is combined floodgate sense switches, and 18 is separating brake storage capacitors, and 19 is combined floodgate storage capacitors, and 20 is charge power supplies.

Embodiment

The active distribution network voltage collapse administering method driving high speed circuit breaker based on eddy current that the present invention proposes, the structured flowchart of the active distribution network dual power supply system that it relates to as shown in Figure 1, comprises the following steps:

(1) between the inlet wire transformer 1 and mains side sectionalized bus 6 of active distribution network, an electric power incoming line circuit breaker 2 is connected, between mains side sectionalized bus 6 and standby electricity source sectionalized bus 7, connect a section breaker 3, described electric power incoming line circuit breaker 2 and section breaker 3 are eddy current driving high speed circuit breaker;

(2) sense of current setting electric power incoming line inflow mains side sectionalized bus 5 is positive direction, and the current signal collector in active distribution network detects the current phase angle on electric power incoming line voltage signal collector in active distribution network detects the voltage phase angle at sensitive load point place if then judge that electric current on electric power incoming line is as forward current, if then judge that electric current on electric power incoming line is as reverse current;

(3) voltage signal collector in active distribution network detects the voltage of mains side sectionalized bus in real time, according to mains side sectionalized bus voltage, calculates effective value U (k) of mains side sectionalized bus voltage,

Wherein, k is the sequence number of the mains side sectionalized bus place voltage effective value that voltage signal collector detects, the voltage effective value of the mains side sectionalized bus that U (k) detects for voltage signal collector kth time, i is the sequence number of the instantaneous voltage that voltage signal collector collects, u _ifor the instantaneous voltage that voltage signal collector collects at i-th time, N is the number of instantaneous voltage, and the value of N is generally the number of the instantaneous voltage that voltage signal collector gathers in half power frequency period;

(4) the minimum tolerance value U of sensitive load voltage is set _tol, the voltage of mains side sectionalized bus is judged, if U (k) is less than U _tol, then judge that mains side sectionalized bus voltage that voltage signal collector detects is as lower, if U (k) is more than or equal to U _tol, then judge that voltage signal collector does not detect the voltage that mains side sectionalized bus is lower;

(5) according to the result of determination of the sense of current on above-mentioned steps (2) electric power incoming line and step (4) mains side sectionalized bus voltage, if the electric current on electric power incoming line is reverse current, and mains side sectionalized bus voltage is lower, then judge, at the mains side sectionalized bus place of active distribution network, voltage collapse occurs, the controller be connected with described electric power incoming line circuit breaker 2 in active distribution network sends open command to electric power incoming line circuit breaker, carry out step (6), if the electric current on electric power incoming line is reverse current, mains side sectionalized bus voltage is not lower, then repeat step (2)-step (4), if the electric current on electric power incoming line is forward current, and mains side sectionalized bus voltage is not lower, then repeat step (2)-step (4), if mains side sectionalized bus voltage is lower, and the electric current on electric power incoming line is forward current, then judge that mains side sectionalized bus place is short-circuited fault, the controller be connected with described electric power incoming line circuit breaker in active distribution network sends open command to electric power incoming line circuit breaker, carry out step (6),

(6) open command is performed in 10 milliseconds after electric power incoming line circuit breaker receives open command, disconnect when electric power incoming line current zero-crossing point, and according to the result of determination of step (5), carry out following operation: if voltage collapse occurs at the mains side sectionalized bus place of active distribution network, then carry out step (7), the fault if mains side sectionalized bus place is short-circuited, then carry out malfunction elimination to mains side bus;

(7) disconnect at described electric power incoming line circuit breaker, and when described section breaker not yet closes a floodgate, the sensitive load of active distribution network is powered by the distributed power source of active distribution network;

(8) judge the closing operation of described section breaker 3, detailed process is as follows:

(8-1) the initial phase angle φ of mains side sectionalized bus 5 voltage when the voltage signal collector of active distribution network gathers disconnection moment of electric power incoming line circuit breaker ₁, the standby electricity source voltage signal collector of active distribution network gathers the initial phase angle φ of standby electricity source sectionalized bus 6 voltage ₂, calculate initial phase angular difference φ ₀=φ ₂-φ ₁, the frequency f of the voltage signal collector Real-time Collection mains side sectionalized bus voltage in active distribution network ₁, the frequency f of the standby electricity source voltage signal collector Real-time Collection standby electricity source sectionalized bus voltage of active distribution network ₂, calculated rate difference Δ f=f ₂-f ₁;

(8-2) adopt following formula, calculate the phase angle difference Δ φ of the voltage at sensitive load point place and the voltage of stand-by power supply in t active distribution network:

$\mathrm{\Δ\φ}\left(t\right)={\mathrm{\φ}}_0+\underset{0}{\overset{t}{\∫}}2\mathrm{\π\Δfdt}$

Set the setting value of phase angle difference setting value and difference on the frequency respectively, the closing operation of section breaker is judged, if phase angle difference is less than or equal to phase angle difference setting value, and difference on the frequency is less than or equal to difference on the frequency setting value, then judge that section breaker possesses combined floodgate condition, and performing step (9), the setting value of phase angle difference is generally 10 degree, and the setting value of difference on the frequency is generally 1Hz; If phase angle difference is greater than phase angle difference setting value, and difference on the frequency is less than or equal to difference on the frequency setting value, then judge that section breaker does not possess combined floodgate condition, carry out step (8-3); If phase angle difference is greater than phase angle difference setting value, and difference on the frequency is greater than difference on the frequency setting value, then judge that section breaker does not possess combined floodgate condition, carry out step (8-3); If phase angle difference is less than or equal to phase angle difference setting value, and difference on the frequency is greater than difference on the frequency setting value, then judge that section breaker does not possess combined floodgate condition, carry out step (8-3);

(8-3) according to the computing formula of step (8-2), continue to calculate phase angle difference Δ φ, until during Δ φ=360 °, judge that section breaker possesses combined floodgate condition, carry out step (9);

(9) be connected with section breaker in active distribution network described in controller send reclosing command to section breaker;

(10) after section breaker closes a floodgate, by the stand-by power supply in active distribution network and distributed power source jointly for sensitive load is powered.

In the inventive method, the electric load of the voltage collapse sensitivity in electric power system is called sensitive load.For the sensitive load point adopting dual power supply in active distribution network, its electric power incoming line circuit breaker and section breaker are replaced with existing eddy current and drive high speed circuit breaker; Under the state that voltage collapse does not occur at sensitive load point place, electric power incoming line circuit breaker remains closed, and section breaker remains open.The eddy current used in the inventive method drives high speed circuit breaker, what the motive force of its moving contact adopted is the electromagnetic force that heavy impulse current produces, instead of the mechanical force that general circuit breaker adopts, therefore can realize quick acting switching-off and the quick acting switching-off of circuit breaker, commercially have matured product.

The eddy current used in the inventive method drives rapid cut-off device, and as shown in Figure 2, wherein, 8 is fixed contacts to its structure, and 9 is moving contacts, and 10 is vacuum interrupters.11 is insulators, and 12 is switching windings, and 13 is eddy-current discs, and 14 is closing coils, and 15 is bistable mechanisms, and 16 is trip inspection slowdown monitoring switch, and 17 is combined floodgate sense switches, and 18 is separating brake storage capacitors, and 19 is combined floodgate storage capacitors, and 20 is charge power supplies.Its basic functional principle is:

(1-1) eddy current drives high speed circuit breaker in the stationary case, trip inspection slowdown monitoring switch, combined floodgate sense switch all disconnect, switching winding 12 and closing coil 14 all no current flow through, charge power supply is charged to separating brake storage capacitor 18 and combined floodgate storage capacitor 19, makes separating brake electric capacity have the terminal voltage identical with charge power supply with combined floodgate electric capacity;

(1-2) mode that eddy current drives high speed circuit breaker to realize separating brake is: trip inspection slowdown monitoring switch 16 receives the sub-gate signal from the controller be connected with described electric power incoming line circuit breaker in active distribution network, closed during sinusoidal current zero crossing in circuit breaker, separating brake storage capacitor 18 and switching winding 12 form closed-loop path, separating brake storage capacitor 18 charges to switching winding 12, charging current on switching winding produces induced field, induced field induces and the induced current in the same way of the electric current on switching winding on eddy-current disc, this induced current is subject to the effect of the induced field of the charging current of switching winding, the active force that generation one is downward on eddy-current disc, eddy-current disc is subject to this active force and moves downward, moving contact 9 in arc chamber moves downward, distance between moving contact 9 and fixed contact 8 increases, arc extinction between moving contact 9 and fixed contact 8, realize separating brake,

(1-3) mode that eddy current drives high speed circuit breaker to realize closing a floodgate is: the switching signal that combined floodgate sense switch 17 receives from the controller be connected with described stand-by power supply lead-in circuit breaker in active distribution network closes.Combined floodgate storage capacitor and closing coil form closed-loop path, combined floodgate storage capacitor charges to closing coil, charging current on closing coil produces induced field, induced field induces and the induced current in the same way of the electric current on closing coil on eddy-current disc, this induced current is subject to the effect of the induced field of the charging current of closing coil, eddy-current disc produces an active force upwards, eddy-current disc is subject to this active force and moves upward, moving contact in arc chamber moves upward, come in contact between moving contact and fixed contact, realize closing a floodgate;

The transformer related in the inventive method is 10kV/0.4kV.

Claims (1)

1. drive an active distribution network voltage collapse administering method for high speed circuit breaker based on eddy current, it is characterized in that the method comprises the following steps:

(1) between the inlet wire transformer and mains side sectionalized bus of active distribution network, an electric power incoming line circuit breaker is connected, between mains side sectionalized bus and standby electricity source sectionalized bus, connect a section breaker, described electric power incoming line circuit breaker and section breaker are that eddy current drives high speed circuit breaker;

(2) sense of current setting electric power incoming line inflow mains side sectionalized bus is positive direction, and the current signal collector in active distribution network detects the current phase angle on electric power incoming line voltage signal collector in active distribution network detects the voltage phase angle at sensitive load point place if then judge that electric current on electric power incoming line is as forward current, if then judge that electric current on electric power incoming line is as reverse current;

(3) voltage signal collector in active distribution network detects the voltage of mains side sectionalized bus in real time, according to mains side sectionalized bus voltage, calculates effective value U (k) of mains side sectionalized bus voltage,

Wherein, k is the sequence number of the mains side sectionalized bus place voltage effective value that voltage signal collector detects, the voltage effective value of the mains side sectionalized bus that U (k) detects for voltage signal collector kth time, i is the sequence number of the instantaneous voltage that voltage signal collector collects, u _ifor the instantaneous voltage that voltage signal collector collects at i-th time, N is the number of instantaneous voltage;

(4) the minimum tolerance value U of sensitive load voltage is set _tol, the voltage of mains side sectionalized bus is judged, if U (k) is less than U _tol, then judge that mains side sectionalized bus voltage that voltage signal collector detects is as lower, if U (k) is more than or equal to U _tol, then judge that voltage signal collector does not detect the voltage that mains side sectionalized bus is lower;

(5) according to the result of determination of the sense of current on above-mentioned steps (2) electric power incoming line and step (4) mains side sectionalized bus voltage, if the electric current on electric power incoming line is reverse current, and mains side sectionalized bus voltage is lower, then judge, at the mains side sectionalized bus place of active distribution network, voltage collapse occurs, the controller be connected with described electric power incoming line circuit breaker in active distribution network sends open command to electric power incoming line circuit breaker, carry out step (6), if the electric current on electric power incoming line is reverse current, mains side sectionalized bus voltage is not lower, then repeat step (2)-step (4), if the electric current on electric power incoming line is forward current, and mains side sectionalized bus voltage is not lower, then repeat step (2)-step (4), if mains side sectionalized bus voltage is lower, and the electric current on electric power incoming line is forward current, then judge that mains side sectionalized bus place is short-circuited fault, the controller be connected with described electric power incoming line circuit breaker in active distribution network sends open command to electric power incoming line circuit breaker, carry out step (6),

(6) open command is performed in 10 milliseconds after electric power incoming line circuit breaker receives open command, and according to the result of determination of step (5), carry out following operation: if voltage collapse occurs at the mains side sectionalized bus place of active distribution network, then carry out step (7), the fault if mains side sectionalized bus place is short-circuited, then carry out malfunction elimination to mains side bus;

(7) disconnect at described electric power incoming line circuit breaker, and when described section breaker not yet closes a floodgate, the sensitive load of active distribution network is powered by the distributed power source of active distribution network;

(8) judge the closing operation of described section breaker, detailed process is as follows:

(8-1) the initial phase angle φ of mains side sectionalized bus voltage when the voltage signal collector of active distribution network gathers disconnection moment of electric power incoming line circuit breaker ₁, the standby electricity source voltage signal collector of active distribution network gathers the initial phase angle φ of standby electricity source sectionalized bus voltage ₂, calculate initial phase angular difference φ ₀=φ ₂-φ ₁, the frequency f of the voltage signal collector Real-time Collection mains side sectionalized bus voltage in active distribution network ₁, the frequency f of the standby electricity source voltage signal collector Real-time Collection standby electricity source sectionalized bus voltage of active distribution network ₂, calculated rate difference Δ f=f ₂-f ₁;

(8-2) adopt following formula, calculate the phase angle difference Δ φ of the voltage at sensitive load point place and the voltage of stand-by power supply in t active distribution network:

$\mathrm{\Δ\φ}\left(t\right)={\mathrm{\φ}}_0+\underset{0}{\overset{t}{\∫}}2\mathrm{\π\Δfdt}$

Set the setting value of phase angle difference setting value and difference on the frequency respectively, the closing operation of section breaker is judged, if phase angle difference is less than or equal to phase angle difference setting value, and difference on the frequency is less than or equal to difference on the frequency setting value, then judges that section breaker possesses combined floodgate condition, and perform step (9), if phase angle difference is greater than phase angle difference setting value, and difference on the frequency is less than or equal to difference on the frequency setting value, then judge that section breaker does not possess combined floodgate condition, carries out step (8-3); If phase angle difference is greater than phase angle difference setting value, and difference on the frequency is greater than difference on the frequency setting value, then judge that section breaker does not possess combined floodgate condition, carry out step (8-3); If phase angle difference is less than or equal to phase angle difference setting value, and difference on the frequency is greater than difference on the frequency setting value, then judge that section breaker does not possess combined floodgate condition, carry out step (8-3);

(8-3) according to the computing formula of step (8-2), continue to calculate phase angle difference Δ φ, until during Δ φ=360 °, judge that section breaker possesses combined floodgate condition, carry out step (9);

(9) be connected with section breaker in active distribution network described in controller send reclosing command to section breaker;

(10) after section breaker closes a floodgate, by the stand-by power supply in active distribution network and distributed power source jointly for sensitive load is powered.