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Power coordination control device and method for inertia support and primary frequency modulation of energy storage power station

A technology of coordinated control and energy storage power station, applied in the direction of reducing/preventing power oscillation, AC network load balancing, single-network parallel feeding arrangement, etc. Coordination and other issues to achieve the effect of improving support capacity, improving safety and stability, and avoiding circulation

Pending Publication Date: 2022-07-15
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, when controlling inertial support and primary frequency regulation of energy storage power stations, multi-converter autonomous droop control is usually used. In this control mode, each converter cannot coordinate with other converters when completing the frequency response.
Affected by the sampling accuracy and output response characteristics of the converters, when the frequency and voltage of the power grid are disturbed, the use of multi-converter autonomous droop control has problems such as multi-machine response asynchrony, multi-machine circulation, and deviations in primary frequency modulation assessment. The overall operation control of the energy storage power station has brought great challenges

Method used

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  • Power coordination control device and method for inertia support and primary frequency modulation of energy storage power station
  • Power coordination control device and method for inertia support and primary frequency modulation of energy storage power station
  • Power coordination control device and method for inertia support and primary frequency modulation of energy storage power station

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Embodiment 1

[0049] The invention provides a whole station inertia support, primary frequency regulation and dynamic reactive power control device of an energy storage power station. On the basis of the power outer loop and the voltage inner loop of the energy storage converter, the whole station coordination control module is introduced, and the whole station is installed in the whole station. In the coordinated control module, the whole station inertia, primary frequency regulation, and dynamic reactive power control unit are set, so that the energy storage power station has millisecond-level inertia, primary frequency regulation and dynamic voltage regulation response capabilities. as attached figure 1 As shown, the device includes a whole station coordination control module and a converter power control module;

[0050] The whole station coordination control module includes the whole station inertia control unit, the whole station primary frequency modulation control unit and the whole...

Embodiment 2

[0073] The present invention provides a device and method for inertial support, primary frequency regulation and dynamic reactive power control of an energy storage power station. as attached figure 2 As shown, the system includes an upper-level master control unit, a coordinated control module for the entire station, and a coordinated control slave.

[0074] The upper-level main control unit is used for energy management of the energy storage power station, and the upper-level main control unit adopts IEC 104, Modbus / TCP104 communication protocol through the switch to communicate with the coordination control module of the whole station, and then reaches AGC, AVC command values, such as figure 1 P in ref and Q ref ;

[0075] The whole station coordination control module is used for the calculation and distribution of primary frequency modulation, inertia support and dynamic reactive power response value; figure 1 It has been introduced in detail in its description; the c...

Embodiment 3

[0088] Based on the same inventive concept, the present invention provides a method for inertial support, primary frequency modulation and dynamic reactive power control of an energy storage power station. as attached image 3 As shown, the method includes the following steps:

[0089] Step S1: Coordinate the sampling board of the controller to collect the frequency f of the PCC point and the three-phase voltage u abc , three-phase current i abc value and frequency change rate df / dt;

[0090] Step S2: Compare the frequency change rate with 0 (representing that the grid frequency is unchanged), and the comparison result is multiplied by Jω through the proportional link n , and then multiplied by K by the converter power distribution unit J Rear output △P Jk ; (k represents the kth energy storage converter, a total of N energy storage converters)

[0091] Step S3: Set the frequency f and the frequency given value f ref For comparison, the comparison result is multiplied b...

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Abstract

The invention provides a power coordination control device and method for inertia support and primary frequency modulation of an energy storage power station, a whole station coordination control module is introduced on the basis of a power outer ring and a voltage inner ring of an energy storage converter, and a whole station inertia, primary frequency modulation and dynamic reactive power control unit is arranged in the whole station coordination control module. Therefore, the energy storage power station has millisecond inertia, primary frequency modulation and dynamic voltage regulation response capability. According to the method, the in-station energy storage converter can have the primary frequency modulation characteristic and the inertia response characteristic with higher consistency, the requirements of inertia support and primary frequency modulation of the whole station are met, and the active and reactive power output external characteristics of the energy storage power station are improved; high-precision frequency sampling is achieved, the problem that PCS sampling precision is insufficient is solved, the supporting capacity of an energy storage power station for power grid frequency and stability is improved, and power grid operation safety and stability are improved.

Description

technical field [0001] The invention relates to the field of energy storage power stations, in particular to a power coordination control device and method for inertia support and primary frequency regulation of energy storage power stations. Background technique [0002] With my country's goal of "carbon peaking and carbon neutrality", my country is accelerating the construction of a new power system with new energy as the main body, and the clean energy transformation is accelerating, which means that more and more new energy will be connected to The power system, and the high proportion of renewable energy access will bring certain challenges to the safe and stable operation of the power grid. On the one hand, the output of renewable energy is fluctuating and random, which brings challenges to the real-time balance of electric energy. On the other hand, the connection of renewable energy such as wind power and photovoltaic to the power grid requires power electronic equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/32H02J3/46H02J3/48H02J3/50
CPCH02J3/241H02J3/32H02J3/46H02J3/48H02J3/50
Inventor 胡安平朱少杰陶以彬杨波孙博
Owner CHINA ELECTRIC POWER RES INST
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