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SST Flexible Interconnection Router Boosts DER Absorption Solutions

RW Energy 08/12/2026

1. Industry Background and Pain Point Analysis

1.1 Industry Background

The explosive growth of distributed photovoltaics (residential + commercial & industrial) has brought three new challenges to distribution networks: reverse heavy loading at substation areas, voltage limit violations, and difficulties in renewable energy accommodation.

The traditional distribution network's rigid structure of "one substation area, one transformer" cannot achieve power mutual support between substation areas, resulting in the coexistence of solar curtailment and transformer overloading.

Topology Diagram of SST Directly-connected Flexible Interconnection

1.2 Four Major Pain Points of Traditional Distribution Networks

Pain Point	Manifestation	Physical Root Cause
Difficult Accommodation	Solar curtailment in PV-rich substation areas	No power mutual support between substation areas
Reverse Heavy Loading	Transformer overloading in substation areas during peak PV generation	Unidirectional power distribution structure
Voltage Limit Violations	Voltage rise at PV concentration points	No active voltage regulation capability
High Losses	Long-distance power transmission	Uncontrollable power flow

1.3 Core Differences Between Traditional and SST Flexible Interconnection (Physical Essence)

Traditional Distribution Network (Rigid Substation Areas)

Aspect	Physical Principle	Limitation
Independent Substation Areas	One transformer per substation area	No power mutual support
Unidirectional Power Flow	Source → Load	PV reverse flow becomes a problem

SST Flexible Interconnection (Flexible Substation Areas)

Aspect	Physical Principle	Advantage
Common DC Bus	Multiple substation area SSTs interconnected	Power mutual support capability
Bidirectional Power Flow	SST controllable bidirectional	Local PV accommodation

Physical Essence: The SST power router connects multiple substation areas to a common DC bus, allowing PV-rich substation areas to transfer power to power-deficient areas. This is the physical foundation for achieving +18% distributed PV accommodation.

2. Solution Overview and Value Proposition

2.1 Solution Definition (BLUF)

The SST Direct-Attached Flexible Interconnection Power Router (1.5/2.0MW, AC10kV/DC±10kV) enables flexible interconnection of multiple substation areas through a common DC bus:

Distributed PV accommodation +18%
Network losses reduced by 5%+
Equipment efficiency 98.7% (verified by Guangdong Power Grid)

Flexible Interconnection Application

2.2 Core Value Proposition

Value Dimension	Quantitative Metric	Description
Distributed PV Accommodation	+18%	Local PV consumption
Network Loss Reduction	-5%+	Flexible power flow control
Equipment Efficiency	98.7%	+4% improvement over traditional solutions
Single Unit Capacity	1.5/2.0 MW	Covers medium-voltage substation areas
Port Voltage	AC10kV/DC±10kV	AC and DC dual ports

3. System Architecture Design

3.1 System Topology (Layered Breakdown)

Substation Area A 10kV ──► [SST Power Router A] ──┐
Substation Area B 10kV ──► [SST Power Router B] ──┼──► Common DC Bus DC±10kV
Substation Area C 10kV ──► [SST Power Router C] ──┘
                                                    ├──► Substation Area Loads
                                                    ├──► Distributed PV Integration
                                                    └──► Energy Storage Coupling Port

Topology Layer-by-Layer Explanation

Layer	Composition	Power Flow	Design Rationale
Substation Area Access	10kV from each substation area	Substation area ↔ DC bus	Multi-area interconnection
Common DC Bus	DC±10kV	Power mutual support between areas	Bidirectional power flow capability
Loads/Sources	Loads + PV + Energy Storage	Bidirectional	Local accommodation

3.2 Flexible Power Flow Control Principle

Traditional substation transformers can only perform "unidirectional step-down power transmission." The SST power router, by contrast, functions as a "controllable bidirectional power valve." By controlling the power setpoints of each port, it enables power transfer from PV-rich substation areas to power-deficient areas while actively suppressing voltage limit violations.

4. Core Equipment and Technical Parameters

Parameter	Value	Physical Significance
Single Unit Capacity	1.5/2.0 MW	Covers medium-voltage distribution substation areas
Port Voltage	AC10kV/DC±10kV	AC and DC dual ports
Distributed PV Accommodation	+18%	Local PV consumption
Network Loss Reduction	-5%+	Flexible power flow control
Equipment Efficiency	98.7%	Verified by Guangdong Power Grid

5. Technical Highlights and In-Depth Physical Principle Analysis

5.1 Highlight 1: Common DC Bus Power Mutual Support

Physical Principle: Multiple substation area SSTs share a common DC bus, enabling PV-rich substation areas to directly deliver power to power-deficient areas.

Quantified Benefit: Distributed PV accommodation +18%, eliminating solar curtailment.

5.2 Highlight 2: Active Voltage Suppression

Physical Principle: SST can dynamically regulate reactive power and active power at each port, actively suppressing voltage rise at PV concentration points.

Quantified Benefit: Elimination of voltage limit violations, improved power quality.

5.3 Highlight 3: Network Loss Reduction

Physical Principle: Controllable power flow paths avoid long-distance circuitous transmission.

Quantified Benefit: Network losses reduced by 5%+.

Flexible Interconnection Topology Diagram

6. Economic Comparison with Traditional Solutions

Cost Item	Traditional Solution	SST Solution	Savings
Accommodation Revenue	Solar curtailment loss	+18% accommodation	Increased generation revenue
Line Losses	Baseline	-5%+	Reduced operating costs
Expansion Investment	New transformer required	Flexible interconnection	Deferred CAPEX