CN105322541A - Simulated power flow calculation method for transformer substation - Google Patents
Simulated power flow calculation method for transformer substation Download PDFInfo
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- CN105322541A CN105322541A CN201510807529.9A CN201510807529A CN105322541A CN 105322541 A CN105322541 A CN 105322541A CN 201510807529 A CN201510807529 A CN 201510807529A CN 105322541 A CN105322541 A CN 105322541A
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Abstract
The invention relates to a simulated power flow calculation method for a transformer substation, and belongs to the technical field of operation and control of power systems. The method comprises the following steps: firstly, reading primary equipment information and topological relationship information in the transformer substation; secondly, generating topological island information according to the primary equipment information and the topological relationship; and finally calculating power flow data of primary equipment in topological islands according to power balance. According to the simulated power flow calculation method for the transformer substation, the connection mode and the operation mode of a bus are identified; the power, the power factors and phase current of various lines in the island are calculated in each topological island according to the power balance and the topological connection relationship of the transformer substation; a corresponding calculation is also carried out on the power flow under the operation modes of a bus coupler operation, a paralleling operation of a primary transformer and the like; the simulated power flow calculation method conforms to the power flow data characteristics of the transformer substation; and the power flow data are provided for a transformer substation monitoring system or a simulation training system.
Description
Technical field
The present invention relates to a kind of substation simulation tidal current computing method, belong to operation and control of electric power system technical field.
Background technology
In monitoring system of electric substation test, the course of receiving, need flow data to check the functions such as picture refreshing, configuration, data statistics, usually have two kinds of method of testings.First method accesses voltage, current-mode analog quantity by tester to measure and control device; When device is more, need device wiring one by one, debugging work load is large; Secondly, several device access analog quantitys wherein can only be given at every turn, the telemetry refresh case at full station can not be detected simultaneously; Second method is by analog machine and supervisory control system communication, the data such as upper power transmission pressure, electric current, power, but the flow data that this method produces random number often, onrelevant between data, data variation randomness is larger, do not meet the flow data feature in substation operation process, comprehensively cannot verify the function of monitoring system of electric substation.
Flow data is also a requisite part in Substation Training Simulator, and the imitating substation power flow changing scene that the flow data meeting substation operation feature can be true to nature, strengthens result of training; Trend after breaker operator in training process, fault after the switch changed position such as protection act is corresponding to be changed thereupon, and this all needs the dynamic Load flow calculation according to connection type and changes of operating modes.
Current Load flow calculation is the Load flow calculation towards electrical network, needs the impedance parameter of the topological structure of electrical network and each circuit, and in computational process, transformer station is regarded as a node in electrical network, the flow data calculated is all the flow data of grid nodes.And the Load flow calculation in transformer station can be regarded as the Load flow calculation of zero impedance, substation line is numerous, and operational mode is changeable, and the existing tidal current computing method towards electrical network cannot meet Load flow calculation requirement in station.
Summary of the invention
The object of this invention is to provide a kind of substation simulation tidal current computing method, to realize the calculating to emulating trend in transformer station.
The present invention provides a kind of substation simulation tidal current computing method for solving the problems of the technologies described above, and these computational methods comprise the following steps:
1) primary equipment information and primary equipment topological connection relation in transformer station is obtained;
2) topological island information is generated according to primary equipment topological connection relation and on off state;
3) based on power-balance, set up power-balance expression formula, calculate active power, reactive power, the power factor (PF) of each circuit in conjunction with power circuit performance number, charge circuit load proportion and direction of tide in topological island, calculate phase current in conjunction with the electric pressure residing for topological island;
4) after switch changed position or when power circuit trend changes, step 1 is repeated)-3), the trend of transformer station is recalculated.
Described topological island refers to the primary equipment set be connected, and in topological island centered by bus, bus is regarded as each connection node, and for bus paired running mode, the bus that bus connection switch connects is merged into a node; For bus fanout operation mode, the bus that bus connection switch connects is conduct independently node separately.
Described step 3) Load flow calculation process in, when main transformer paired running, the power between main transformer is according to main transformer capacity pro rate; When main transformer fanout operation, independent calculating separately.
Described step 3) Load flow calculation process in, for transformer, power loss thinks to be 0, and main transformer each side power meets power-balance requirement; For two winding transformer, after the power calculation of main transformer side completes, opposite side performance number is set to the performance number of calculation side, and symbol is contrary; For three-winding transformer, after having calculated the power of both sides, according to the power of power equilibrium calculation the 3rd side.
Described step 3) Load flow calculation process in, when mother is in co-bit, by the line power that calculates on wherein one section of bus of connecting of mother and the power calculating bus; For 3/2 wiring, the circuit breaker current often on string calculates according to Kirchhoff's current law (KCL).
Described step 1) in primary equipment topological connection relation be the primary equipment topology information generated by graphic configuration instrument, every bar topology information is a nodal information, comprises primary equipment ID and terminal number that this node connects.
Described step 1) in the flow data that primary equipment information comprises No. ID, primary equipment, primary equipment type associates with primary equipment.
The invention has the beneficial effects as follows: first the present invention reads primary equipment information and topological relation information in transformer station, then according to primary equipment information and Topology generation topology island information; Finally according to the flow data of primary equipment in power equilibrium calculation topology island.The present invention passes through the mode of connection and the operational mode that identify bus, according to the topological connection relation of transformer station, according to power, power factor (PF), the phase current of each circuit in power equilibrium calculation island in each topological island; Corresponding calculating be have also been made for the trend under the operational modes such as mother operation, main transformer paired running, meet transformer station's flow data feature, for monitoring system of electric substation or simulation training system provide flow data.
Accompanying drawing explanation
Fig. 1 is the overview flow chart of substation simulation tidal current computing method of the present invention;
Fig. 2 is the realization flow figure of Load flow calculation module.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
1. read primary equipment information, according to its feature, relevant information read to dissimilar equipment.
Primary equipment information comprises the flow data of device id number, the association of device type, equipment; Device type refers to switchtype, disconnecting link type under different connected mode, can react wiring feature.Such as: for double bus scheme form, isolation switch type comprises outgoing line side disconnecting link, the female isolation switch of I, the female isolation switch of II; Normal circuit breaker, bus are divided into for circuit breaker, the female circuit breaker of 3/2 wiring I, 3/2 wiring network interconnecting circuit, the female circuit breaker of 3/2 wiring II etc.; Primary equipment information is used for automatic identification and the calculating of different connection type and operational mode.Primary equipment information is completed by modeling tool, is stored in database.
2. read full station primary equipment topological relation information.
Primary equipment topological connection relation is the primary equipment topological data information generated by graphic configuration instrument, and every bar topology information is a nodal information, comprises No. ID, primary equipment and terminal number that this node connects.
3. according to primary equipment information and Topology generation topology island information.
Topology island refers to the primary equipment set be connected, in topology island centered by bus, bus is regarded as each circuit (comprising main transformer side) connected node, for bus paired running (bus connection switch is in co-bit) mode, the bus that bus connection switch connects is merged into a node; For bus fanout operation (bus connection switch is in a point position) mode, the bus that bus connection switch connects is conduct independently node separately.Each topological island is the set of each circuit taking bus as connected node, and the switch of each circuit is all in co-bit.For the bus having bus, if bus is in co-bit, the bus be connected with bus is merged into a bus; Bus is in a point position, and each bus independently calculates; Circuit breaker is in the circuit of point position, in the flow data of this circuit, except voltage, is 0.
3. according to the flow data in power equilibrium calculation topology island.
In topology island, Load flow calculation is based on power-balance, set up power-balance expression formula, calculate active power, reactive power, the power factor (PF) of each circuit in conjunction with the known conditions (power circuit performance number, charge circuit load proportion and direction of tide) in topological island; Phase current can be calculated in conjunction with the electric pressure residing for topological island.
Before carrying out Load flow calculation, lower information need be configured to:
1) electric pressure information: whole electric pressure magnitudes of voltage of transforming plant primary equipment.
2) bus connection type: the bus wiring information of each electric pressure, comprises the common connection types such as single busbar connection, single mother partition, double-bus, two mother partition and 3/2 wiring.
3) line information definition: line information comprises circuit types, load proportion and Line Flow direction.Circuit types comprises power circuit and charge circuit two kinds, and power circuit is the trend source of transformer station, and the trend value of such circuit is one of initial condition of Load flow calculation; Charge circuit refers to the circuit (or main transformer side) of trend the unknown; Load proportion refers to the performance number proportion of charge circuit; Line Flow direction refers to the Line Flow direction pre-set.
4) power forward definition: power is negative by flowing into bus, flowing out bus is just.
5) real time information: comprise circuit breaker, isolating switch position, can obtain before each calculating from real-time database.
A. line power calculates, and comprises active power, reactive power, power factor (PF).
Active power balance according on bus:
Wherein P
ifor i-th the total active power of circuit in topological island; N is the number of lines in topological island.
According to power circuit active power value, charge circuit load proportion value and direction of tide, calculate each circuit active-power P
i.In like manner, according to the reactive power equilibrium on bus
In formula, Q
ifor i-th total reactive power of circuit in topological island; N is the number of lines in topological island.
According to power circuit reactive power value, charge circuit load proportion value and direction of tide, calculate the reactive power Q of each circuit
i.
According to total active power of circuit, the power factor (PF) of total reactive power calculating circuit
B. the calculating of phase current
According to total active power, busbar voltage, the power factor (PF) calculating phase current of circuit
Wherein U is the specified phase voltage under this electric pressure.
Calculate the electric current on bus or section breaker and power
During for single mother partition or double-bus bus-coupled operation, bus connection switch power P
conncalculate:
P
ifor the total active power of circuit that I mother in topological island connects.
For 3/2 wiring, the circuit breaker current often on string calculates according to Kirchhoff's current law (KCL).For transformer, power loss thinks to be 0, and main transformer each side power meets power-balance.For two winding transformer, after the power calculation of main transformer side completes, opposite side performance number is set to the performance number of calculation side, symbol is contrary; For three-winding transformer, after having calculated the power of both sides, according to the power of power equilibrium calculation the 3rd side.
In Load flow calculation process, during main transformer paired running, the power between main transformer is according to main transformer capacity pro rate; During main transformer fanout operation, independent calculating separately.
In Load flow calculation process, for transformer, power loss thinks to be 0, and main transformer each side power meets power-balance requirement.For two winding transformer, after the power calculation of main transformer side completes, opposite side performance number is set to the performance number of calculation side, and symbol is contrary; For three-winding transformer, after having calculated the power of both sides, according to the power of power equilibrium calculation the 3rd side.
In Load flow calculation process, when mother is in co-bit, the power of the line power on the wherein one section of bus connected by calculating mother and calculating bus; For 3/2 wiring, the circuit breaker current often on string calculates according to Kirchhoff's current law (KCL).
4. by the Load flow calculation Data Update that obtains to real-time database.
5. when repeating above-mentioned steps after switch changed position or when power circuit trend changes.
Claims (7)
1. a substation simulation tidal current computing method, is characterized in that, these computational methods comprise the following steps:
1) primary equipment information and primary equipment topological connection relation in transformer station is obtained;
2) topological island information is generated according to primary equipment topological connection relation and on off state;
3) based on power-balance, set up power-balance expression formula, calculate active power, reactive power, the power factor (PF) of each circuit in conjunction with power circuit performance number, charge circuit load proportion and direction of tide in topological island, calculate phase current in conjunction with the electric pressure residing for topological island;
4) after switch changed position or when power circuit trend changes, step 1 is repeated)-3), the trend of transformer station is recalculated.
2. substation simulation tidal current computing method according to claim 1, it is characterized in that, described topological island refers to the primary equipment set be connected, in topology island centered by bus, bus is regarded as each connection node, for bus paired running mode, the bus that bus connection switch connects is merged into a node; For bus fanout operation mode, the bus that bus connection switch connects is conduct independently node separately.
3. substation simulation tidal current computing method according to claim 2, is characterized in that, described step 3) Load flow calculation process in, when main transformer paired running, the power between main transformer is according to main transformer capacity pro rate; When main transformer fanout operation, independent calculating separately.
4. substation simulation tidal current computing method according to claim 2, is characterized in that, described step 3) Load flow calculation process in, for transformer, power loss thinks to be 0, and main transformer each side power meets power-balance requirement; For two winding transformer, after the power calculation of main transformer side completes, opposite side performance number is set to the performance number of calculation side, and symbol is contrary; For three-winding transformer, after having calculated the power of both sides, according to the power of power equilibrium calculation the 3rd side.
5. substation simulation tidal current computing method according to claim 2, it is characterized in that, described step 3) Load flow calculation process in, when mother is in co-bit, by the line power that calculates on wherein one section of bus of connecting of mother and the power calculating bus; For 3/2 wiring, the circuit breaker current often on string calculates according to Kirchhoff's current law (KCL).
6. substation simulation tidal current computing method according to claim 3, it is characterized in that, described step 1) in primary equipment topological connection relation be the primary equipment topology information generated by graphic configuration instrument, every bar topology information is a nodal information, comprises primary equipment ID and terminal number that this node connects.
7. substation simulation tidal current computing method according to claim 3, is characterized in that, described step 1) in the flow data that primary equipment information comprises No. ID, primary equipment, primary equipment type associates with primary equipment.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106980599A (en) * | 2017-03-16 | 2017-07-25 | 南方电网科学研究院有限责任公司 | The method of Completing Missing Values and device of a kind of scheduling simulation system |
| CN111953071A (en) * | 2020-07-21 | 2020-11-17 | 广东电网有限责任公司 | Intelligent classification statistical method for transformer substation wiring form |
| CN112698584A (en) * | 2020-12-29 | 2021-04-23 | 长沙诺思谱瑞仪器有限公司 | One-key sequence control simulation test method, device, equipment and medium for transformer substation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980599A (en) * | 2017-03-16 | 2017-07-25 | 南方电网科学研究院有限责任公司 | The method of Completing Missing Values and device of a kind of scheduling simulation system |
| CN106980599B (en) * | 2017-03-16 | 2020-08-14 | 南方电网科学研究院有限责任公司 | Missing data supplementing method and device for scheduling simulation system |
| CN111953071A (en) * | 2020-07-21 | 2020-11-17 | 广东电网有限责任公司 | Intelligent classification statistical method for transformer substation wiring form |
| CN112698584A (en) * | 2020-12-29 | 2021-04-23 | 长沙诺思谱瑞仪器有限公司 | One-key sequence control simulation test method, device, equipment and medium for transformer substation |
| CN112698584B (en) * | 2020-12-29 | 2024-03-15 | 长沙诺思谱瑞仪器有限公司 | Substation one-key sequential control simulation test method, device, equipment and medium |
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