CN104319748A - Quick adjustment method for parallel line branching factor in substation area distance protection section III - Google Patents

Abstract

The invention relates to a quick adjustment method for a parallel line branching factor in a substation area distance protection section III, and belongs to the field of a power system protection and control technology. The method comprises the steps of judging whether a protective starting line is a parallel line structure, quickly modifying the parallel line branching factor if the protective starting line is a parallel line structure and trip or switch on is caused, and then calculating a distance ground section III and a phase distance ground connection III in accordance with a current protective setting value after the definite value of the distance section III is quickly modified, and judging whether fault is caused; directly performing protection algorithm processing if the protective starting line is not a parallel line structure. According to the quick adjustment method provided by the invention, the contradiction of the substation area distance protection section III in flexibility and selectivity can be overcome; furthermore, a parallel line running condition can be quickly adjusted, so as to improve the reliability of the motion in the substation area distance protection section III.

Description

Territory distance protection III section of standing parallel lines braning factor fast adjustment method

Technical field

The invention belongs to protecting electrical power system and control technology field, particularly a kind of territory, station distance protection III section parallel lines braning factor fast adjustment method being applied to intelligent substation.

Background technology

Intelligent substation has advantageous advantage in secondary device compatibility, interoperability, data resource sharing etc., brings digitized change to electric power system.Based on IEC61850 standard, the jumping/station such as combined floodgate information, the electric current and voltage information domain information of the full station equipment of transformer station is shared.The Protective strategy sharing information based on territory, station is in the ascendant.The applicant has disclosed a kind of protecting control method of Digitized transformation station equipment and the multi-function device of first integrated transformer substation protection and control in patent CN101478146A; A kind of Fast starting and phasor calculating method of intelligent substation integrated protection is disclosed in patent CN102761106A.

Patent CN102403701A put forward the adaptive distance protection method of double-circuit line of intelligent substation; according to adjacent lines analog quantity information and the position of the switch information of Real-time Collection; judge adjacent lines running status belongs to which kind of situation following: 1. adjacent lines both sides are normally run; 2. adjacent lines both sides sky is hung and is run; 3. adjacent lines both sides hang ground operation; according to result of determination, this circuit of dynamic conditioning distance I section definite value.But the method does not consider adjacent lines generation single-phase fault, the single-phase power flow transfer situation caused after protection first time single-phase tripping operation; And due to the quick acting of distance I section, the method has problems in real-time, be difficult to realize.

The self-adaptive sites method of distance III section is not yet mentioned.

Summary of the invention

The object of the invention is the deficiency for solving prior art; a kind of station territory distance protection III section parallel lines braning factor fast adjustment method is proposed; when changing for intelligent substation parallel lines on off state, improve the reliability of station territory distance protection III section action.

The one station territory distance protection III section parallel lines braning factor fast adjustment method that the present invention proposes, it is characterized in that, the method comprises the following steps:

Step 1) judge whether protection starting circuit L1 is parallel lines structure, if enter step 2); Otherwise directly carry out step 4) carry out protection algorism process;

Step 2) according to GOOSE message information, judge whether the parallel lines of circuit L1 have tripping operation or close a floodgate, if having jumping or combined floodgate information, then carry out steps 3); Otherwise, enter step 4);

Step 3) according to the jumping of the parallel circuit of circuit L1 or combined floodgate information, braning factor is adjusted, specifically comprises:

If single-phase jumping or combined floodgate information, then adjust this phase, the braning factor represented with A phase is:

K′ _Ab＝1/M

In formula, K ' _abfor parallel circuit A phase trip after amendment braning factor, M be jump or close a floodgate after parallel lines A phase return number;

Again A phase ground distance III section setting value is revised as:

Z _set.A.III＝K _Kz ₁l _local+K _KK′ _AbZ _{set.II_remote}

In formula, Z _set.A.IIIfor the A phase ground distance III section setting value of circuit L1; K _kfor safety factor, generally get 0.7 ~ 0.8; z ₁for the unit length positive sequence impedance of circuit L1, l _localfor circuit L1 and line length; Z _{set.II_remote}for the subordinate circuit distance II section setting value of circuit L1; K ' _abfor parallel circuit A phase trip after amendment braning factor;

If three-phase breaker tripping and closing information, then all modify to three-phase impedance of adjusting, adjustment braning factor is:

K′ _b＝1/M

In formula, K ' _bfor amended braning factor, M is that the parallel lines after jumping or closing a floodgate return number;

III section of adjusting the distance again setting value is modified:

Z _set.III＝K _Kz ₁l _local+K _KK′ _bZ _{set.II_remote}

In formula, Z _set.IIIfor distance ground connection III section, the phase spacing ground connection III section setting value of circuit L1, three-phase is all changed; K _kfor safety factor, generally get 0.7 ~ 0.8; z ₁for the unit length positive sequence impedance of circuit L1, l _localfor circuit L1 and line length at the corresponding levels; Z _{set.II_remote}for subordinate circuit distance II section setting value; K ' _bfor amended braning factor;

Step 4) carry out distance ground connection III section, the calculating of phase spacing ground connection III segment protect according to current protection seting value.

Feature of the present invention and beneficial effect:

The feature of territory, station distance protection III section parallel lines braning factor fast adjustment method proposed by the invention is: the GOOSE tripping operation message shared based on intelligent substation war territory; after transformer station's parallel lines on off state changes; adjust the setting value that braning factor revises distance protection then as early as possible, the method is applicable to station territory ground distance protection III section and territory, station phase distance protection III section.

This beneficial effect of the invention is: the malfunction avoiding causing because protection definite value is different from real-time branch coefficient, tripping situation, improves the reliability of territory distance protection III section action of standing.

Accompanying drawing explanation

Fig. 1 is application station of the present invention territory distance protection III section parallel lines braning factor fast adjustment method schematic diagram.

Embodiment

The present invention propose one station territory distance protection III section parallel lines braning factor fast adjustment method, by reference to the accompanying drawings and embodiment be described in detail as follows.

As shown in Figure 1, the method comprises the following steps territory, the station distance protection III section parallel lines braning factor fast adjustment method flow process that the present invention proposes:

Step 1) judge whether protection starting circuit L1 is parallel lines structure, if enter step 2); Otherwise directly carry out step 4) carry out protection algorism process;

Step 2) according to GOOSE message information, judge whether the parallel lines of circuit L1 have tripping operation or close a floodgate, if having jumping or combined floodgate information, then carry out steps 3); Otherwise, enter step 4);

Step 3) according to the jumping of the parallel circuit of circuit L1 or combined floodgate information, braning factor is adjusted, specifically comprises:

If single-phase jumping or combined floodgate information, then adjust this phase, the braning factor represented with A phase is:

K′ _Ab＝1/M

In formula, K ' _abfor parallel circuit A phase trip after amendment braning factor, M be jump or close a floodgate after parallel lines A phase return number;

Again A phase ground distance III section setting value is revised as:

Z _set.A.III＝K _Kz ₁l _local+K _KK′ _AbZ _{set.II_remote}

In formula, Z _set.A.IIIfor the A phase ground distance III section setting value of circuit L1; K _kfor safety factor, generally get 0.7 ~ 0.8; z ₁for the unit length positive sequence impedance of circuit L1, l _localfor circuit L1 and line length; Z _{set.II_remote}for the subordinate circuit distance II section setting value of circuit L1; K ' _abfor parallel circuit A phase trip after amendment braning factor;

If three-phase breaker tripping and closing information, then all modify to three-phase impedance of adjusting, adjustment braning factor is:

K′ _b＝1/M

In formula, K ' _bfor amended braning factor, M is that the parallel lines after jumping or closing a floodgate return number;

III section of adjusting the distance again setting value is modified:

Z _set.III＝K _Kz ₁l _local+K _KK′ _bZ _{set.II_remote}

In formula, Z _set.IIIfor distance ground connection III section, the phase spacing ground connection III section setting value of circuit L1, three-phase is all changed; K _kfor safety factor, generally get 0.7 ~ 0.8; z ₁for the unit length positive sequence impedance of circuit L1, l _localfor circuit L1 and line length at the corresponding levels; Z _{set.II_remote}for subordinate circuit distance II section setting value; K ' _bfor amended braning factor;

Step 4) carry out distance ground connection III section, phase spacing ground connection III segment protect calculating (concrete grammar belongs to routine techniques) according to current protection seting value.

On the basis that station domain information is shared, territory distance backup protection of standing can know the switch changed position information of many circuits.When after circuit L1 protection starting, before carrying out distance protection III section handling procedure, according to GOOSE message, rapid adjustment is carried out to the braning factor of parallel lines, then regulate protection definite value.Such rapid adjustment braning factor effectively can improve the performance of parallel lines distance protection III section, especially to the selectivity of power flow transfer single-phase during accident overload.

Claims (1)

1. territory distance protection III section of standing a parallel lines braning factor fast adjustment method, it is characterized in that, the method comprises the following steps:

Step 1) judge whether protection starting circuit L1 is parallel lines structure, if enter step 2); Otherwise directly carry out step 4) carry out protection algorism process;

Step 2) according to GOOSE message information, judge whether the parallel lines of circuit L1 have tripping operation or close a floodgate, if having jumping or combined floodgate information, then carry out steps 3); Otherwise, enter step 4);

Step 3) according to the jumping of the parallel circuit of circuit L1 or combined floodgate information, braning factor is adjusted, specifically comprises:

If single-phase jumping or combined floodgate information, then adjust this phase, the braning factor represented with A phase is:

K′ _Ab＝1/M

In formula, K ' _abfor parallel circuit A phase trip after amendment braning factor, M be jump or close a floodgate after parallel lines A phase return number;

Again A phase ground distance III section setting value is revised as:

Z _set.A.III＝K _Kz ₁l _local+K _KK′ _AbZ _{set.II_remote}

In formula, Z _set.A.IIIfor the A phase ground distance III section setting value of circuit L1; K _kfor safety factor, value is 0.7 ~ 0.8; z ₁for the unit length positive sequence impedance of circuit L1, l _localfor circuit L1 and line length; Z _{set.II_remote}for the subordinate circuit distance II section setting value of circuit L1; K ' _abfor parallel circuit A phase trip after amendment braning factor;

If three-phase breaker tripping and closing information, then all modify to three-phase impedance of adjusting, adjustment braning factor is:

K′ _b＝1/M

In formula, K ' _bfor amended braning factor, M is that the parallel lines after jumping or closing a floodgate return number;

III section of adjusting the distance again setting value is modified:

Z _set.III＝K _Kz ₁l _local+K _KK′ _bZ _{set.II_remote}

In formula, Z _set.IIIfor distance ground connection III section, the phase spacing ground connection III section setting value of circuit L1, three-phase is all changed; K _kfor safety factor, generally get 0.7 ~ 0.8; z ₁for the unit length positive sequence impedance of circuit L1, l _localfor circuit L1 and line length at the corresponding levels; Z _{set.II_remote}for subordinate circuit distance II section setting value; K ' _bfor amended braning factor;

Step 4) carry out distance ground connection III section, the calculating of phase spacing ground connection III segment protect according to current protection seting value.