CN101908763B - Method for controlling distribution network closed loop - Google Patents
Method for controlling distribution network closed loop Download PDFInfo
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- CN101908763B CN101908763B CN2010102372299A CN201010237229A CN101908763B CN 101908763 B CN101908763 B CN 101908763B CN 2010102372299 A CN2010102372299 A CN 2010102372299A CN 201010237229 A CN201010237229 A CN 201010237229A CN 101908763 B CN101908763 B CN 101908763B
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Abstract
The invention provides a method for controlling a distribution network closed loop. The method comprises the following steps of: performing load flow calculation on a closed loop path to acquire open loop steady-state current of the closed loop path; calculating equivalent closed loop current generated by closed loop operation according to flow data of the closed loop path; superimposing the open loop steady-state current and the equivalent closed loop current, and calculating closed loop steady-state current after closing a loop; comparing the closed loop steady-state current with the preset maximum operating current of the closed loop path; and if the closed loop steady-state current is less than or equal to the maximum operating current, performing the closed loop operation, and if the closed loop steady-state current is more than the maximum operating current, ending off the closed loop operation. The method for controlling the distribution network closed loop can realize safer distribution network closed loop operation, and is helpful for a distribution network dispatcher to perform safe adjustment on a regional electric power network.
Description
Technical field
The present invention relates to the field of electrical network cyclization technology, relate in particular to a kind of distribution network closed loop control method.
Background technology
Because the continuous development of national economy is had higher requirement to power supply reliability, the pattern of bidirectional power supply and multiple feed is to improve a kind of effective powering mode of electric power system distribution power supply reliability.Under this powering mode; When interruption maintenance, burst accident or load transfer, can select suitable supply path through the cyclization operation, thereby guarantee the reliable power supply of power distribution network the user; Improve the economy of power distribution network operation, improve the economic benefit and the social benefit of power supply enterprise.Therefore the cyclization operation is a requisite link in the power system operation operation.
When cyclization is operated; Need the steady-state current after the verification cyclization to avoid apparatus overload, and in the ordinary course of things, whether operating personnel can only determine by rule of thumb can cyclization; Usually adopt relatively more conservative way; When not having special assurance, avoid the cyclization operation, but this still can't guarantee the fail safe of each cyclization operation as far as possible, reduce the reliability of power distribution network power supply.
Summary of the invention
To the more unsafe defective of the control method of distribution network closed loop in the prior art; The technical problem that the present invention will solve is to provide a kind of can realize the control method of the distribution network closed loop of the distribution network closed loop operation of safety, helps the distribution scheduling personnel that regional electric power networks is carried out safe adjustment.
A kind of control method of distribution network closed loop may further comprise the steps: judge whether the cyclization path belongs to same 220kV subregion; When said cyclization path belongs to same 220kV subregion, judge whether major network possesses the whole network trend design conditions, if possess, then calculate the voltage data of said 10kV bus according to said the whole network trend design conditions; If do not possess, then, carry out the radiational tide flowmeter and calculate said 10kV busbar voltage data with 220kV substation bus bar node as a reference; When said cyclization path does not belong to same 220kV subregion, judge whether said major network possesses the whole network trend design conditions, if possess, then calculate the voltage data of said 10kV bus according to said the whole network trend design conditions; If do not possess, then through obtaining the voltage data of said 10kV bus with the mode of communicating by letter of major network; According to the voltage data of said 10kV bus, push back before the utilization and for method the following feed line of power supply of 10kV in said cyclization path is carried out the radial line trend and calculate, obtain the open loop steady-state current of said feed line of power supply; According to the flow data in cyclization path, calculate the equivalent cyclization electric current that produces because of the cyclization operation; With said open loop steady-state current and the stack of said equivalent cyclization electric current, calculate the cyclization steady-state current after the said cyclization; The size of the size of more said cyclization steady-state current and predefined said cyclization path maximum operating currenbt; If said cyclization steady-state current is less than or equal to said maximum operating currenbt, then carry out the cyclization operation; If said cyclization steady-state current, then stops the cyclization operation greater than said maximum operating currenbt.
Compared with prior art; In the control method of distribution network closed loop of the present invention; Calculate the open loop steady-state current in said cyclization path respectively and operate the equivalent cyclization electric current that produces, utilize the circuit principle of stacking to calculate the cyclization steady-state current on the said cyclization path again because of cyclization.Therefore can judge whether the cyclization operation can cause apparatus overload according to said cyclization steady-state current, only when having apparatus overload dangerous, just not carry out cyclization,, then stop cyclization and operate if the danger of apparatus overload is arranged.Therefore, can make the safer of cyclization operation, help the distribution scheduling personnel regional electric power networks rationally to be adjusted, thereby improve the reliability of operation of power networks, guarantee user benefit, reduce loss of outage through cyclization.
Description of drawings
Fig. 1 is the schematic flow sheet of the control method of distribution network closed loop of the present invention;
Fig. 2 is the principle schematic of the control method of distribution network closed loop of the present invention;
Fig. 3 is the power network wiring sketch map that the cyclization operation takes place.
Embodiment
See also Fig. 1, Fig. 1 is the schematic flow sheet of the control method of distribution network closed loop of the present invention.
According to the circuit principle of stacking, the cyclization steady-state current of said cyclization path after cyclization is equivalent to the stack of the equivalent cyclization electric current that produces owing to cyclization switch ends electrical potential difference after open loop steady-state current and the cyclization before the cyclization.
With Fig. 2 is example, and before the cyclization, switch BRK1 is in open position, and the electric current of feeder line 1 is i1 (because the distribution of load brings the feeder current decay), and the electric current of feeder line 2 is i2; After the cyclization, switch BRK01 is in the close position, because the original voltage of BRK01 switch does not wait (amplitude and phase angle are inequality), certainly will produce equivalent cyclization current i loop so.
The steady-state current Ic1 of feeder line 1 is after the cyclization:
Ic1＝i1+iloop；
The steady-state current Ic2 of feeder line 2 is:
Ic2＝i2-iloop；
Calculate said open loop steady-state current and said equivalent cyclization electric current respectively, can calculate said cyclization steady-state current according to above-mentioned principle.
Therefore, the control method of distribution network closed loop of the present invention may further comprise the steps:
S101, trend calculating is carried out in the involutive ring path, obtains the open loop steady-state current in said cyclization path;
Carry out the information of the cyclization switch of cyclization operation according to operating personnel's selection; The information of the interconnection switch on the 10kV feed line of power supply for example; Being starting point with said cyclization switch carries out the network topology analysis to the model of distribution and major network; Obtain the cyclization path of distribution section, trend calculating is carried out in the involutive ring path then, obtains the open loop steady-state current in said cyclization path.
Usually major network being carried out trend calculates the trend of the electric pressure that can obtain 10kV and above supply line and distributes; For the open loop steady-state current of the feed line of power supply below the distribution section 10kV, then need carry out the calculating of radial line trend according to the voltage data of major network section 10KV bus and obtain.
Consider electrical network generally all by the 220kV partition running, need judge at first whether said cyclization path belongs to same 220kV subregion when therefore calculating.
If said cyclization path belongs to same 220kV subregion, the feed line of power supply that feeder line 1 as shown in Figure 3 and feeder line 2 belong to 10kV, it then is the 10kV feed line of power supply cyclization of same 220kV electrical network subregion through the interconnection switch cyclization.At this moment; Judge whether major network possesses the whole network trend and calculate (NR/PQ) condition; Said the whole network trend design conditions are meant the adequate condition that the trend of the 10kV that calculates said major network and above supply line distributes; Comprising each bar line parameter circuit value data, and the performance number of each load etc., specifically can from the SCADA system (data acquisition and supervisor control) of correspondence, obtain.If possess said the whole network trend design conditions, then calculate the voltage data of said 10kV bus according to said the whole network trend design conditions; If do not possess said the whole network trend design conditions, then, carry out the radiational tide flowmeter and calculate said 10kV busbar voltage data with 220kV substation bus bar node as a reference.
If said cyclization path does not belong to same 220kV subregion, feeder line 3 for example shown in Figure 3 passes through the interconnection switch cyclization with feeder line 4, then is the 10kV feed line of power supply cyclization of different 220kV electrical network subregions.At this moment, judge equally at first whether said major network possesses the whole network trend design conditions,, then calculate the voltage data of said 10kV bus according to said the whole network trend design conditions if possess; If do not possess, because do not belong to same subregion, can't carry out the radiational tide flowmeter and calculate, then can obtain the voltage data of said 10kV bus through the mode that communicates with major network.
Obtain after the voltage data of said 10kV bus, push back before promptly capable of using and for method the following feeder line section of 10kV in said cyclization path is carried out the radial line trend and calculate, obtain the open loop steady-state current of the following feeder line of said 10kV.
S103 according to the flow data in cyclization path, calculates the equivalent cyclization electric current that produces because of the cyclization operation;
When calculating said equivalent cyclization electric current, adopt Dai Weinan circuit equivalent model to calculate.Equivalent voltage source is the electrical potential difference of said cyclization switch ends, and equivalent reactance is all the branch impedance sums on the said cyclization path.
The electrical potential difference of said cyclization switch ends can be found the solution through the Load distribution data on the said cyclization path; Because actual Load distribution situation more complicated; Therefore can think approx that load density equates; Set average load density, according to the duty values such as length ratio calculating of said average load density and feeder line, again according to the said electrical potential difference that waits duty value to find the solution said cyclization switch ends.
According to said equivalent voltage source and said equivalent reactance, can calculate the equivalent cyclization electric current on the said cyclization path.
S105 is with said open loop steady-state current and said equivalent cyclization electric current stack, the cyclization steady-state current in said cyclization path after the calculating cyclization;
S107, the size of the size of more said cyclization steady-state current and predefined said cyclization path maximum operating currenbt;
Specifically can preestablish the maximum operating currenbt in said cyclization path according to the load condition on the said cyclization path.Said cyclization steady-state current and said maximum operating currenbt are compared, judge whether to surpass said maximum operating currenbt and cause apparatus overload.
If said cyclization steady-state current is less than or equal to said maximum operating currenbt, explain that then the steady-state current on the said cyclization path after the cyclization can't cause the danger of apparatus overload, so execution in step S109;
If said cyclization steady-state current is greater than said maximum operating currenbt, then the steady-state current after the explanation execution cyclization is crossed and is had much the danger that causes apparatus overload, so execution in step S111.
S109 carries out the cyclization operation;
S111 stops the cyclization operation.
Compared with prior art; In the control method of distribution network closed loop of the present invention; Calculate the open loop steady-state current in said cyclization path respectively and operate the equivalent cyclization electric current that produces, utilize the circuit principle of stacking to calculate the cyclization steady-state current on the said cyclization path again because of cyclization.Therefore can judge whether the cyclization operation can cause apparatus overload according to said cyclization steady-state current, only when having apparatus overload dangerous, just not carry out cyclization,, then stop cyclization and operate if the danger of apparatus overload is arranged.Therefore, can make the safer of cyclization operation, help the distribution scheduling personnel regional electric power networks rationally to be adjusted, thereby improve the reliability of operation of power networks, guarantee user benefit, reduce loss of outage through cyclization.
As a kind of preferred implementation; In the control method of distribution network closed loop of the present invention; Execution in step S103 calculates after the said equivalent cyclization electric current; Carry out a step S104: calculate the impact coefficient in said cyclization path, and according to said equivalent cyclization electric current and said impact coefficient, the impulse current when calculating cyclization.The calculating of said impact coefficient belongs to the calculating of the zero state response problem of firstorder circuit, and those skilled in the art can realize according to technological means commonly used.
And in step S107, when more said cyclization steady-state current and said maximum operating currenbt, further the trigger current with overcurrent protection on said impulse current and the said cyclization path compares;
If said cyclization steady-state current value is less than or equal to said maximum operating currenbt, and said impulse current is less than or equal to the trigger current of overcurrent protection on the said cyclization path, execution in step S109; Otherwise, execution in step S111.
Compare with said first execution mode; Further calculate the impulse current on the said cyclization path in the control method of this execution mode distribution network closed loop; Judge said impulse current whether greater than the trigger current of overcurrent protection on the said cyclization path, prevent that the cyclization operation from causing large-area power outage because of the false triggering overcurrent protection.Therefore, further improve the fail safe of cyclization operation and the reliability of operation of power networks, help the distribution scheduling personnel more and regional electric power networks is rationally adjusted through cyclization.
When the each item in carrying out the present invention is calculated,, need the deal with data amount bigger, therefore can select to do following simplification and handle because actual electrical network is very complicated:
To the 10kV feed line of power supply, set equivalent parameters, and susceptance and the electric capacity set over the ground are zero;
It is identical and all be 0 to set the on high-tension side voltage phase angle of 10kV feed line of power supply step-down transformer;
Only consider the cyclization point (switch) of distribution network closed loop operation by conventional cyclization mode of operation;
For each hand-in-hand ring, import the parameter of two circuits respectively: equiva lent impedance, the coefficient of equivalence in addition, also need be imported the load ratio of two circuits;
When the active power that goes out wiretap, reactive power and electric current are only known one of them condition, calculate the active power or the reactive power of circuit by the power factor of acquiescence;
On the functional arrangement during interconnection switch cyclization, think that operating position fixes, therefore; When in the station, going out to select on the wiretap cyclization to calculate menu, if this on off state for dividing, then is the cyclization operation of this switch in the closed station; If on off state for closing, then is the cyclization operation of closed feeder line interconnection switch;
For the load on the non-cyclization path, suppose that its active power and reactive power are constant, before and after cyclization, do not change.
Simplification through to computation model is handled, and can make the control method of distribution network closed loop of the present invention be applicable to practical application request, engineering calculation and the practicability that distribution scheduling is operated more.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection range of the present invention.
Claims (5)
1. the control method of a distribution network closed loop is characterized in that may further comprise the steps:
Judge whether the cyclization path belongs to same 220kV subregion;
When said cyclization path belongs to same 220kV subregion, judge whether major network possesses the whole network trend design conditions, if possess, then calculate the voltage data of 10kV bus according to said the whole network trend design conditions; If do not possess,, carry out the radiational tide flowmeter and calculate 10kV busbar voltage data then with 220kV substation bus bar node as a reference;
When said cyclization path does not belong to same 220kV subregion, judge whether major network possesses the whole network trend design conditions, if possess, then calculate the voltage data of 10kV bus according to said the whole network trend design conditions; If do not possess, then through obtaining the voltage data of 10kV bus with the mode of communicating by letter of major network;
According to the voltage data of said 10kV bus, push back before the utilization and for method the following feed line of power supply of 10kV in said cyclization path is carried out the radial line trend and calculate, obtain the open loop steady-state current of said feed line of power supply;
According to the flow data in cyclization path, calculate the equivalent cyclization electric current that produces because of the cyclization operation;
With said open loop steady-state current and said equivalent cyclization electric current stack, the cyclization steady-state current after the calculating cyclization;
The size of the size of more said cyclization steady-state current and predefined said cyclization path maximum operating currenbt;
If said cyclization steady-state current is less than or equal to said maximum operating currenbt, then carry out the cyclization operation; If said cyclization steady-state current, then stops the cyclization operation greater than said maximum operating currenbt.
2. the control method of distribution network closed loop as claimed in claim 1 is characterized in that, according to the flow data in cyclization path, the step of calculating the equivalent cyclization electric current that produces because of the cyclization operation comprises:
The electrical potential difference of obtaining the cyclization switch ends is as equivalent voltage source;
Obtain all branch impedance sums on the said cyclization path as equivalent reactance;
According to said equivalent voltage source and said equivalent reactance, calculate the equivalent cyclization electric current that produces on the said cyclization path.
3. the control method of distribution network closed loop as claimed in claim 2 is characterized in that, the electrical potential difference of obtaining the cyclization switch ends comprises as the step of equivalent voltage source:
Obtain the average load density on the said cyclization path;
According to the duty values such as length ratio calculating of said average load density and feeder line, calculate the electrical potential difference of said cyclization switch ends.
4. like the control method of any described distribution network closed loop in the claim 1 to 3, it is characterized in that, calculate after the said equivalent cyclization electric current, further comprise step:
Calculate the impact coefficient in said cyclization path;
According to said equivalent cyclization electric current and said impact coefficient, the impulse current when calculating cyclization;
When the size of more said cyclization steady-state current and predefined said cyclization path maximum operating currenbt big or small, the further size of the trigger current of overcurrent protection on the size of more said impulse current and the said cyclization path;
If said cyclization steady-state current is less than or equal to said maximum operating currenbt, and the trigger current that is less than or equal to overcurrent protection on the said cyclization path of said impulse current, said cyclization operation then carried out; Otherwise stop said cyclization operation.
5. like the control method of any described distribution network closed loop in the claim 1 to 3, it is characterized in that, simplify one of them in handling below when calculating flow data, carrying out:
To the 10kV feed line of power supply, set equivalent parameters, and susceptance and the electric capacity set over the ground are zero;
It is identical and all be 0 to set the on high-tension side voltage phase angle of 10kV feed line of power supply step-down transformer;
When the active power that goes out wiretap, reactive power and electric current are only known one of them condition, calculate the active power or the reactive power of circuit by the power factor of acquiescence;
For the load on the non-cyclization path, suppose that its active power and reactive power are constant, before and after cyclization, do not change.
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