RU2776422C1 - System for optimal distributed electricity supply - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering, in particular, to automated systems for supervisory dispatch control of distributed electricity supply systems. The technical result is achieved by the system for optimal distributed electricity supply, containing, functionally linked, a complex of technical means (CTM) for monitoring the operating condition and mode of operation (MOCMO) of electricity receivers (ER), a CTM for supervisory dispatch control (SDC), including a CTM for MOCMO of electricity sources (ES), in the form of power plants and accumulator batteries, a CTM for MOCMO of an electrical network (EN). The CTM for SDC is therein functionally and informationally interconnected with the CTM for MOCMO of ER, ES and EN. The CTM for MOCMO of ES predicts the operability and calculates the coefficient of ES use priority for a given time interval. The CTM for MOCMO of EN predicts the operability, throughput capacity and topology of the EN of a distributed electricity supply system (DESS) for a given time interval.

EFFECT: ensured optimal mode of operation of a distributed electricity supply system in accordance with the criteria for minimising the amount of disconnected consumers and operating costs of electricity sources for a given time interval.

1 cl, 1 dwg

Description

The invention relates to electrical engineering and can be used to create automated systems for operational dispatch control of distributed power supply systems (RSES).

Known devices and methods of operational dispatch control (ODU) RSES [1. RU2684482 dated 04/09/2019; 2. RU2338310 dated 03.08.2007; 3.RU 2665700 dated 08/13/2014; 4. RU 2726735 dated 07/15/2020; 5. RU 2719456 dated 07/18/2019; 6. RU 2710048 dated 07/18/2019; 7. RU 2698864 dated 04/16/2019 8. RU 2697510 dated 04/10/2018; 9. RU 2518178 dated February 11, 2009]. The disadvantages of the known analogues are: the lack of priority in the use of electricity sources, taking into account their operating costs, technical condition and level of wear; lack of optimization of the RSES operation mode or the impossibility of finding the absolute optimum of the RSES operation mode.

Closest to the claimed invention are a method and device for balancing electricity consumption [RU 2666751 dated 22.07.2014]. The device consists of a complex of technical means (CTS) for monitoring the operational state and operation mode of electric power receivers (PE) and CTS of operational dispatch control (ODC). At the same time, the CTS for monitoring the operational state and mode of operation of the PE contains: a means for estimating the electricity consumed during a given time interval; a means for comparing the consumed electricity of the PE with its minimum and maximum threshold values. At the same time, the CTS ODU contains: means for calculating the amount of energy to be changed in accordance with the difference between the estimated and expected values of the consumed electricity; means for determining a strategy for changing the amount of electricity supplied to individual PE, in order to reduce the difference between the current value of the consumed electricity and its expected value; a means of activating the operational management of electricity consumption in accordance with the selected strategy; a means of verifying the results of operational management of electricity consumption; means for determining a new power change strategy if the test fails.

The disadvantage of the prototype is that the power balance is provided only by minimizing the number of disconnected PE, which does not allow optimizing the mode of operation of the RSES in accordance with the criterion of minimizing the operating costs of power sources (IE) for a given time interval.

The objective of the invention is to provide an optimal mode of operation of a distributed power supply system in accordance with the criteria for minimizing disconnected consumers and operating costs of power sources for a given time interval.

The technical result is achieved due to the fact that in the system of optimal distributed power supply, containing functionally related CTS for monitoring the operational state and mode of operation of the PE, CTS ODU, the CTS for monitoring the operational state and mode of operation of the IE are introduced, in the form of power plants and batteries, the CTS for monitoring the operational state and the mode of operation of the electrical network (ES), which includes substations and power lines. At the same time, the CTS of the ODU is functionally and informationally interconnected with the CTS of monitoring the operational state and mode of operation of the PE, IE and ES. The CTS for monitoring the operational state and mode of operation of the IE performs a performance forecast and calculation of the priority coefficient for the use of the IE for a given time interval. The CTS for monitoring the operational state and mode of operation of the ES carries out a forecast of the operability, throughput and topology of the electric network of the RSES for a given time interval. KTS ODU provides the definition of isolated segments of the RSES that do not have electrical connections with each other for a given time interval, the determination of the optimal operating mode (ORR) of the IE of each isolated segment of the RSES for a given time interval and the verification of the sufficiency of the throughput of the controlled sections of the ES in the calculated ORR of each isolated segment RSES for a given time interval.

The invention is illustrated by the drawing shown in the figure:

- a figure - a block diagram of an optimal distributed power supply system.

The figure uses the following designations: 1 - system of optimal distributed power supply; 2 - KTS ODU; 3 - KTS for monitoring the operational state and mode of operation of the PE; 4 - KTS for monitoring the operational state and mode of operation of the power plant; 5 - KTS for monitoring the operational state and mode of operation of the IE; 6 - RSES; 7 - PE; 8 - ES; 9 - IE, while information links and their directions are indicated by dotted arrows, and electric power links and their directions - by continuous arrows.

The claimed device 1 works as follows. KTS for monitoring the operational state and mode of operation of PE 3, receiving information from PE 7, generates retrospective data and forecasts electricity consumption for a given time interval. KTS for monitoring the operational state and mode of operation of IE 5, receiving information from IE 9, generates retrospective data and performs a performance forecast and calculation of the priority of using IE 9 for a given time interval, taking into account the operating costs of IE 9 and their technical condition. KTS for monitoring the operational state and mode of operation of ES 4, receiving information from the elements of ES 8, generates retrospective data and forecasts the performance of the elements of ES 8 for a given time interval. KTS ODU 2, on the basis of information from the KTS monitoring the operational state and mode of operation of ES 8, determines the isolated segments of RSES 6 that do not have electrical communication with each other for a given time interval.

For each isolated segment of RSES 6, KTS ODU 2 determines the number of IE 9 sufficient to ensure the planned power balance with a reserve for the calculated power imbalance for a given time interval. At the same time, when a shortage of electricity is detected in any of the isolated segments of RSES 6, KTS ODU 2 calculates the required minimum number of disconnected PE 7, where, first of all, the least powerful PE 7 in the least priority group are excluded from the calculation of the planned power balance in accordance with with objective function (1):

where P _{ie max i} - the maximum power of the i-th source of electricity; K _st - stability factor (reserve for estimated power imbalance); Р _{pe including j} - power of the j-th PE included in the calculation of the planned balance; R _{pe off k} - power of the k-th PE excluded from the calculation of the planned balance; K _{pe pr k} - power supply priority coefficient of the k-th PE, while the PE with a higher priority has a lower value of this coefficient.

Further, CTS ODU 2 determines the RRR of IE 9, minimizing the amount of the specific contribution of each IE 9 to ensure the planned power balance, multiplied by the priority factor for the use of IE 9 in accordance with the objective function (2) with the planned power balance:

where K _{ie pr i} is the priority coefficient of the i-th source of electricity, while the value of this coefficient is less for a higher priority source of electricity; Р _{ie pr i fact} - the calculated power of the i-th source of electricity necessary to ensure the planned balance.

To check the sufficiency of the throughput capacity of ES 8 in the calculated RRR of each isolated segment of RSES 6, CTS ODU 2 performs a steady state simulation, and if an overload is detected in any isolated segment of RSES 6 of at least one element of ES 8, overloaded elements of ES 8 are removed from the calculation for a given time interval, and for the remaining IE 9, PE 7 and ES 8 elements included in this isolated segment of RSES 6, the operations of determining the presence of electrical connections, determining the RRR and modeling the steady state are repeated.

After determining the RRR for each isolated segment of the RSES 6, the CTS ODU 2 transmits dispatching commands to the CTS for monitoring the operational state and mode of operation of PE 3, ES 4, IE 5, which, in turn, transmit to all PE 7, IE 9 and elements of ES 8 commands for maintaining the calculated RRR of each isolated segment of the RSES 6 until the end of the specified time interval or until the excess of the calculated value of the power imbalance is detected. Any of the above events initiates the procedure for recalculating ORR RSES 6 KTS ODU 2.

The technical result consists in determining and maintaining the optimal mode of operation of a distributed power supply system.

Claims (3)

An optimal distributed power supply system containing a functionally related complex of technical means for monitoring the operational state and operation mode of power receivers and a complex of technical means for operational dispatch control, characterized in that the complex of technical means for operational dispatch control is functionally and informationally interconnected with the complexes of technical means for monitoring the operational state and the mode of operation of power receivers, power sources and the electrical network and ensures the determination of isolated segments of a distributed power supply system that do not have electrical connections with each other for a given time interval, the determination of the optimal mode of operation of power sources of each isolated segment of a distributed power supply system by minimizing the sum of the specific contribution of each source of electricity to ensure the planned balance of power, multiplied on the priority factor of using the source of electricity in accordance with the objective function with the planned power balance:

where К _{ie pr i} is the priority coefficient of the i-th source of electricity, while the value of this coefficient is lower for a higher priority source of electricity; Р _{ee pr i fact} - the calculated power of the i-th source of electricity, necessary to ensure the planned balance.

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