Coordinated control system and method of a plurality of electric springs based on droop characteristics

A technology for coordinating control systems and power springs, applied in the direction of AC network voltage adjustment, reducing/preventing power oscillation, reactive power compensation, etc. Affect the safe operation of the system, etc., to achieve the effect of high practicability, small capacity, and improved dynamic performance

Pending Publication Date: 2019-06-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when multiple power springs are distributed in the microgrid system, due to the existence of line voltage drop, the voltage of multiple power springs cannot reach the same given value (for example: 220V) at the same time, which may cause one or more An electric spring operates at the maximum power output point, which affects the safe operation of the system. Those skilled in the art have been trying new solutions, but the above problems have not been properly resolved.

Method used

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  • Coordinated control system and method of a plurality of electric springs based on droop characteristics
  • Coordinated control system and method of a plurality of electric springs based on droop characteristics
  • Coordinated control system and method of a plurality of electric springs based on droop characteristics

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Embodiment 1

[0019] Embodiment 1: see figure 1 , a coordinated control system for multiple electric springs based on droop characteristics, such as figure 1 As shown, three electric springs are distributed along the transmission line in the microgrid; image 3 As shown, the typical application system of the electric spring includes the traditional generator output voltage source v G , line resistance R 1 , Line inductance L 1 , key load Z C , non-critical load Z NC , a single-phase electric spring system; the single-phase electric spring system is a second-generation single-phase electric spring system that includes a bidirectional DC power supply v dc , a single-phase voltage source inverter module, an LC low-pass filter; the bypass switch S controls the switching of the electric spring. The single-phase voltage source inverter module is an H-bridge structure, composed of four IGBTs, respectively S 11 , S 12 , S 13 and S 14 , the middle point of the H bridge leads to the AC ou...

Embodiment 2

[0020] Example 2: see Figure 1-Figure 4 , the present invention proposes a coordinated control method for multiple electric springs based on droop characteristics. The primary control uses a power decoupling control method for electric springs with an inner loop of current, the inner loop is the current loop, and the outer loop is the voltage outer loop and frequency The outer loop realizes the control of voltage and frequency; the secondary control is droop control, which uses the reactive power of the system to multiply the droop characteristic to correct the setting of the PCC voltage of the system, and the setting of the frequency loop can be determined by the power frequency of the system (for example: 50Hz )Sure.

[0021] For the convenience of analysis, the key load and non-key load are equivalent to a pure resistance during simulation. Among them, the DC side voltage of the inverter circuit is 400V; the LC filter parameters are 2.5mH ​​and 26μF respectively; the key ...

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Abstract

The present invention relates to a coordinated control system and method of a plurality of electric springs based on droop characteristics. The system comprises a generation output voltage source vG,a circuit resistor R1, a circuit inductor L1, a non-key load ZNC, a key load ZC, and at least one single-phase electric spring system; the generation output voltage source vG is connected in series with the circuit resistor R1 and the circuit inductor L1 and is connected with a common connection point (PCC), one end of the key load ZC is connected with the PCC, the other end of the key load is earthed, the at least one single-phase electric spring system and the non-key load ZNC are connected in series to form a smart load (SL), one end of the SL is connected with the PCC, and the other end ofthe SL is earthed. The reactive power of the connection point of the system is multiplied by a certain droop characteristics to dynamically modify the voltage given value of each electric spring, andthe coordinated operation of each electric spring is achieved through the different modified given value. The coordinated control system and method of a plurality of electric springs based on droop characteristics can effectively solve the coordinated operation problem of the electric springs, can maintain the stability of the key load voltage such as a hospital and an information center and canimprove the electric energy quality.

Description

technical field [0001] The invention relates to a control system, in particular to a droop characteristic-based coordinated control system and control method for multiple electric springs, belonging to the application field of power electronics in power systems. Background technique [0002] The electric spring device (electric spring), referred to as ES, is a power electronic device used in the power system. It can effectively alleviate the intermittent and unstable problems of solar energy, wind energy and other new energy power generation, and can effectively maintain the stability of the PCC point voltage. However, when multiple power springs are distributed in the microgrid system, due to the existence of line voltage drop, the voltage of multiple power springs cannot reach the same given value (for example: 220V) at the same time, which may cause one or more Each electric spring operates at the maximum power output point, which affects the safe operation of the system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/24
CPCY02E40/30
Inventor 王青松左武坚程明邓富金
Owner SOUTHEAST UNIV
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